Automated microfluidic device for real-time monitoring of material swelling characteristics

Abstract

A device for real-time monitoring of liquid absorbance and swelling characteristics of soft-tissue materials is provided herein. The device includes a microfluidics circuit configured to monitor volumetric changes in fluids pumped through the circuit, a sample chamber assembly for holding a sample of the soft-tissue material, a flow chamber assembly connected to the microfluidics circuit and the sample chamber assembly, a flow sensor positioned within the microfluidics circuit and configured to measure flow rate of fluids passing through the circuit, and a control system configured to control the microfluidics circuit and to collect data related to the volumetric changes in the fluids and the swelling characteristics of the soft-tissue material.

Description

AUTOMATED MICROFLUIDIC DEVICE FOR REAL-TIME MONITORING OFMATERIAL SWELLING CHARACTERISTICSCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from U.S. Provisional Application Serial No. 63 / 654.015 filed on May 30. 2024, which is incorporated herein by reference in its entirety.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

[0002] Not Applicable.INTRODUCTION

[0003] The measurement and characterization of material swelling properties represents a fundamental aspect of materials science research, particularly in the development of hydrogels, polymers, and soft-tissue materials. These materials find widespread application across diverse fields including biomedical engineering, drug delivery systems, tissue engineering scaffolds, wound dressings, agricultural water retention systems, and various industrial applications where controlled fluid absorption and retention are desired.

[0004] Traditional methods for measuring material swelling characteristics rely predominantly on manual gravimetric techniques, where samples are weighed before and after exposure to test fluids to determine mass changes over time. While these conventional approaches have served the research community for decades, they present several limitations that constrain their effectiveness in modem materials research. Manual weighing methods are labor-intensive, requiring frequent handling of samples that can introduce measurement errors and contamination risks. The discrete nature of manual measurements provides limited temporal resolution, making it difficult to capture rapid swelling kinetics or transient behavior that may occur during the initial stages of fluid absorption.

[0005] Existing automated systems for swelling measurement often employ simple balance-based approaches or optical imaging techniques. Balance-based systems, while providing continuous mass monitoring, typically lack the ability to control environmental conditions such as fluid flow rates, temperature, or chemical composition during testing. These systems also struggle with surface tension effects and evaporation that can introducemeasurement artifacts. Optical methods, though capable of real-time monitoring, are generally limited to surface observations and may not accurately reflect volumetric changes throughout the entire sample, particularly for opaque or thick materials.

[0006] Microfluidic technologies have emerged as powerful tools for precise fluid handling and measurement in various analytical applications. However, current microfluidic approaches for material characterization are primarily focused on single-cell analysis, drug screening, or chemical synthesis rather than bulk material property measurement. The integration of microfluidic principles with material swelling analysis remains underexplored, despite the potential advantages such systems could offer in terms of precise fluid control, reduced sample volumes, and automated operation.

[0007] The field lacks comprehensive solutions that combine the precision of microfluidic fluid handling with the ability to monitor material swelling characteristics in real-time under controlled environmental conditions. Existing systems typically cannot provide simultaneous control over multiple experimental parameters while maintaining the measurement accuracy required for detailed kinetic analysis. Furthermore, most current approaches do not offer the flexibility to accommodate different sample sizes, testing protocols, or fluid compositions within a single integrated platform.

[0008] These limitations in existing measurement technologies create barriers to advancing our understanding of material swelling behavior and hinder the development of new materials with tailored absorption and retention properties. The absence of automated, precise, and versatile measurement systems constrains researchers' ability' to conduct comprehensive studies of swelling kinetics, particularly under dynamic conditions that may better represent real-world applications.

[0009] Several challenges persist in the prior art that limit the advancement of material swelling characterization technologies. Traditional gravimetric methods require frequent manual intervention and sample handling, which introduces measurement variability and limits the temporal resolution necessary for capturing rapid swelling kinetics or transient absorption behavior. Existing automated systems typically lack integrated environmental control capabilities, preventing researchers from conducting tests under precisely controlled temperature, pH, or fluid composition conditions that may be critical for understanding material behavior in real-world applications. Current microfluidic platforms, while offering precise fluid control, are predominantly designed for single-cell analysis or chemical synthesis rather than bulk material property measurement, leaving a significant gap in their application to material swelling studies. Furthermore, most existing measurement approachescannot accommodate the wide range of sample sizes, material ty pes, and testing protocols required for comprehensive materials research, forcing researchers to use multiple disparate systems that cannot provide consistent or comparable results. The inability to simultaneously monitor multiple parameters such as volumetric changes, mass transfer rates, and environmental conditions in real-time severely constrains the depth of analysis possible with current technologies. Additionally, existing systems often struggle with measurement artifacts caused by surface tension effects, evaporation, and temperature fluctuations, which can significantly impact the accuracy and reproducibility of swelling measurements. These unresolved limitations underscore the critical need for an integrated, automated microfluidic platform specifically designed for real-time monitoring of material swelling characteristics under precisely controlled conditions.SUMMARY

[0010] According to an aspect of the present disclosure, a device for real-time monitoring of liquid absorbance and swelling characteristics of soft-tissue materials is provided. The device comprises a microfluidics circuit configured to monitor volumetric changes in fluids pumped through the circuit. The device comprises a sample chamber for holding a sample of the soft-tissue material. The device comprises a flow chamber connected to the microfluidics circuit and the sample chamber. The device comprises a control system configured to control the microfluidics circuit and to collect data related to the volumetric changes in the fluids and the swelling characteristics of the soft-tissue material.

[0011] According to other aspects of the present disclosure, the device may include one or more of the following features. The microfluidics circuit may include a flow sensor configured to measure the flow rate of the fluids. The flow sensor may be configured to provide real-time data to the control system. The sample chamber may be configured to hold a hydrogel sample. The flow chamber may be connected to the microfluidics circuit and the sample chamber via a series of valves. The control system may be configured to adjust the flow rate of the fluids based on the collected data. The device may further comprise a temperature sensor configured to monitor the temperature of the fluids in the microfluidics circuit.

[0012] According to another aspect of the present disclosure, a method for real-time monitoring of liquid absorbance and swelling characteristics of soft-tissue materials is provided. The method comprises the steps of providing a device comprising a microfluidics circuit, a sample chamber, a flow chamber, and a control system. The method comprises thesteps of placing a sample of the soft-tissue material in the sample chamber. The method comprises the steps of pumping a fluid through the microfluidics circuit and into the flow chamber. The method comprises the steps of monitoring volumetric changes in the fluid and swelling characteristics of the soft-tissue material using the control system. The method comprises the steps of collecting data related to the volumetric changes in the fluid and the swelling characteristics of the soft-tissue material.

[0013] According to other aspects of the present disclosure, the method may include one or more of the following features. The soft-tissue material may be a hydrogel. The hydrogel may be used for medical applications. The method may further comprise the step of adjusting the flow rate of the fluids based on the collected data. The control system may be configured to provide real-time data. The microfluidics circuit may include a temperature sensor configured to monitor the temperature of the fluids. The control system may be configured to automatically control the microfluidics circuit based on predetermined parameters.

[0014] According to another aspect of the present disclosure, a system for real-time monitoring of liquid absorbance and swelling characteristics of soft-tissue materials is provided. The system comprises a device comprising a microfluidics circuit, a sample chamber, a flow chamber, and a control system. The system comprises a data collection module configured to collect data related to volumetric changes in fluids pumped through the microfluidics circuit and swelling characteristics of a sample of the soft-tissue material placed in the sample chamber. The system comprises a data analysis module configured to analyze the collected data to determine the liquid absorbance and swelling characteristics of the soft- tissue material.

[0015] According to other aspects of the present disclosure, the system may include one or more of the following features. The microfluidics circuit may include a flow sensor configured to measure the flow rate of the fluids. The flow sensor may be configured to provide real-time data to the control system. The sample chamber may be configured to hold a hydrogel sample. The control system may be configured to adjust the flow rate of the fluids based on the collected data. The system may further comprise a temperature sensor configured to monitor the temperature of the fluids in the microfluidics circuit.

[0016] These and other features, aspects and advantages of the present teachings will become better understood with reference to the following description, examples and appended claims.DRAWINGS

[0017] Those of skill in the art will understand that the drawings, described below, are for illustrative purposes only. The drawings are not intended to limit the scope of the present teachings in any way.

[0018] FIG. 1 illustrates a schematic diagram of a fluid monitoring system designed to analyze liquid absorbance and swelling characteristics of soft-tissue materials, according to aspects of the present disclosure.

[0019] FIG. 2 depicts a block diagram of the automated microfluidic circuit system of FIG. 1, configured to provide precise control and real-time monitoring capabilities, according to an embodiment.

[0020] FIG. 3 shows a schematic diagram of the fluid monitoring system of FIG. 1, emphasizing the fluid flow pathways for accurate volumetric measurements, according to aspects of the present disclosure.

[0021] FIG. 4 illustrates a block diagram of the fluid monitoring system of FIG. 1, highlighting the control components essential for automated testing operations, according to an embodiment.

[0022] FIG. 5 depicts a schematic diagram of the fluid monitoring system of FIG. 1, demonstrating the circulation loop designed for continuous monitoring procedures, according to aspects of the present disclosure.

[0023] FIG. 6 shows a flowchart for a dual-pump test process, optimized to enable efficient transitions between filling and measurement phases, according to an embodiment.

[0024] FIG. 7 illustrates a flowchart for a single-pump test process, designed to provide simplified operation while maintaining measurement accuracy, according to aspects of the present disclosure.

[0025] FIG. 8 depicts an isometric view of a flow chamber assembly, configured to provide controlled fluid interaction with test samples, according to an embodiment.

[0026] FIG. 9 shows an orthogonal view of the fluid monitoring system component of FIG. 8, designed for precise fluid flow control, according to aspects of the present disclosure.

[0027] FIG. 10 illustrates an isometric view of a sample chamber, engineered to accommodate soft-tissue materials during testing procedures, according to an embodiment.

[0028] FIG. 11 depicts an orthogonal view of the sample chamber assembly of FIG. 10, showing the modular design for enhanced maintenance capabilities, according to aspects of the present disclosure.

[0029] FIG. 12 shows multiple orthogonal views of the sample chamber component of FIG. 10. designed to facilitate controlled sample exposure, according to an embodiment.

[0030] FIG. 13 illustrates multiple orthogonal views of the sample chamber component of FIG. 10, emphasizing the fluid management features, according to aspects of the present disclosure.

[0031] FIG. 14 depicts multiple orthogonal views of the sample chamber and outlet solenoid assembly, configured for precise fluid control integration, according to an embodiment.

[0032] FIG. 15 shows a graph demonstrating the relationship between motor speed and measurement accuracy, essential for system calibration, according to aspects of the present disclosure.

[0033] FIG. 16 illustrates swelling test results over time, validating the system's capability to monitor material characteristics, according to an embodiment.

[0034] FIG. 17 depicts a flowchart for the automated microfluidic testing process, designed to ensure systematic and repeatable measurements, according to aspects of the present disclosure.

[0035] FIG. 18 shows a gravimetric flow chart for liquid measurement, providing an alternative approach for enhanced accuracy, according to an embodiment.

[0036] FIG. 19 illustrates a system diagram of the microfluidic monitoring system, configured for streamlined fluid management and control, according to aspects of the present disclosure.

[0037] FIG. 20 depicts three sequential operational phases of the automated microfluidic system, designed to demonstrate the complete measurement cycle, according to an embodiment.

[0038] FIG. 21 shows a block diagram of the fluid monitoring system with integrated temperature control, enhancing testing precision, according to aspects of the present disclosure.

[0039] FIG. 22 illustrates a three-step operational sequence for parallel sample monitoring, designed to increase testing throughput, according to an embodiment.

[0040] FIG. 23 depicts a system diagram of the microfluidic monitoring system with simplified configuration, optimized for basic testing applications, according to aspects of the present disclosure.

[0041] FIG. 24 shows a system diagram with multiple flow sensors, designed to provide redundant measurement capabilities, according to an embodiment.

[0042] FIG. 25 illustrates a block diagram of the fluid monitoring system with integrated drying capabilities, configured for comprehensive sample analysis, according to aspects of the present disclosure.DETAILED DESCRIPTION

[0043] All patents, applications, published applications and other publications cited herein are incorporated by reference in their entirety. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the invention belongs. The chemical structures and formulae set forth herein are constructed according to the standard rules of chemical valency known in the chemical arts. Should a discrepancy exist between a depicted structure and a name given for that structure, the depicted structure is to be accorded more weight. Where the stereochemistry of a structure or a portion of a structure is not indicated in a depicted structure or a portion of the depicted structure, the depicted structure is to be interpreted as encompassing all of its possible stereoisomers.

[0044] Any methods, devices and materials similar or equivalent to those described herein can be used in the practice of this invention. The following definitions are provided to facilitate understanding of certain terms used frequently herein and are not meant to limit the scope of the present disclosure. In the event that there is a plurality of definitions for a term herein, those in this section prevail unless stated otherwise. Headings used herein are for organizational purposes only and in no way limit the invention described herein.

[0045] Abbreviations and Definitions

[0046] To facilitate understanding of the invention, a number of terms and abbreviations as used herein are defined below as follows:

[0047] Microfluidics Circuit: As used herein, the term "microfluidics circuit" refers to a system of interconnected channels, valves, pumps, and sensors designed to manipulate and control small volumes of fluids, typically in the microliter to nanoliter range, for the purpose of monitoring volumetric changes in fluids pumped through the circuit.

[0048] Sample Chamber: As used herein, the term "sample chamber" refers to a containment vessel or compartment specifically configured to hold a sample of soft-tissue material during testing procedures, allowing for controlled exposure to test fluids while maintaining the sample in a fixed position for accurate measurement.

[0049] Flow Chamber: As used herein, the term "flow chamber" refers to a fluidpathway component that is connected to both the microfluidics circuit and the sample chamber, designed to facilitate controlled fluid flow and interaction with the sample material during testing operations.

[0050] Control System: As used herein, the term "control system" refers to an integrated system of hardware and software components configured to control the microfluidics circuit and to collect data related to volumetric changes in fluids and swelling characteristics of soft-tissue materials, including but not limited to microcontroller units, sensors, and data processing capabilities.

[0051] Soft-Tissue Materials: As used herein, the term "soft-tissue materials" is broadly defined to include hydrogels, polymers, biomaterials, and other materials capable of absorbing fluids and exhibiting swelling characteristics when exposed to liquids. Such materials may comprise Polymers:• Nanogels• Microgels• Polyelectrolytes• Dendrimers• Block copolymers• Conductive polymers (e.g., PEDOT:PSS)• Biopolymers (e.g., chitosan, alginate, gelatin)• Thermoplastics (e g., PLA, PLGA, PCL)• Thermosets (e.g., epoxy-based biomaterials) Composite & Hybrid Materials:• Interpenetrating polymer networks (IPNs)• Polymer-ceramic composites• Nanocomposites• Smart materials (e.g., stimuli-responsive polymers)• Self-healing materials Porous & Structured Forms:• Foams• Scaffolds (for tissue engineering)• Microspheres / Nanospheres• ElastomersGels:• Hydrogels• Xerogel• Cryogel Biological materials:• Organoids• Decellulanzed extracellular matrix (dECM)• Organs• Cells• Tissue

[0052] Real-Time Monitoring: As used herein, the term "real-time monitoring" refers to the continuous or near-continuous measurement and data collection of liquid absorbance and swelling characteristics as they occur, without significant delay between the physical changes and their detection and recording.

[0053] Volumetric Changes: As used herein, the term "volumetric changes" refers to measurable alterations in the volume of fluids within the microfluidics circuit that correspond to fluid absorption or displacement by the sample material during swelling or other physical transformations.

[0054] Flow Sensor: As used herein, the term "flow sensor" refers to a measurement device configured to detect and quantify the rate of fluid movement through the microfluidics circuit, providing data for calculating volumetric changes and flow rates.

[0055] Liquid Absorbance: As used herein, the term "liquid absorbance" refers to the capacity' of a material to take up and retain liquid within its structure, resulting in measurable changes in the material's volume, mass, or other physical properties.

[0056] Swelling Characteristics: As used herein, the term "swelling characteristics" refers to the measurable properties and behaviors exhibited by materials when they absorb fluids, including but not limited to the rate of swelling, maximum swelling capacity, and temporal changes in volume or mass.

[0057] Automated Microfluidic Device for Real-Time Monitoring of Material Swelling Characteristics

[0058] The present disclosure relates to an automated microfluidic device that addresses technical limitations in conventional material characterization methods for soft- tissue materials. Traditional approaches for measuring liquid absorbance and swellingcharacteristics of hydrogels, polymers, and biomaterials ty pically rely on manual gravimetric methods that suffer from several technical deficiencies including limited temporal resolution, operator-dependent variability, and inability to provide continuous real-time monitoring during dynamic swelling processes.

[0059] Conventional swelling measurement techniques often require discrete sampling at predetermined time intervals, which may miss transient swelling behaviors and fail to capture the complete kinetic profile of material transformation. Manual weighing methods introduce measurement uncertainties due to surface moisture retention, handling variations, and environmental factors that can affect measurement accuracy. Additionally, traditional approaches lack the capability for automated environmental control, limiting their utility’ for studying swelling behavior under precisely controlled conditions such as specific temperature, pH, or ionic strength parameters.

[0060] The automated microfluidic device described herein provides a technical solution to these limitations through the integration of microfluidic flow control with realtime volumetric measurement capabilities. The device employs microfluidic principles to achieve precise fluid handling in volumes ranging from microliters to nanohters. enabling measurement of volumetric changes with enhanced resolution compared to conventional gravimetric methods. The integration of floyv sensors yvithin the microfluidic circuit allows for continuous monitoring of fluid displacement as materials undergo swelling, providing temporal resolution that may capture rapid swelling kinetics that would be missed by discrete sampling approaches.

[0061] The microfluidic approach enables automated control of environmental parameters including fluid composition, temperature, and floyv rates, providing reproducible testing conditions that eliminate operator-dependent variables. The device architecture incorporates multiple measurement modalities including volumetric flow sensing and optional gravimetric confirmation, alloyving for cross-validation of measurement data and enhanced measurement confidence.

[0062] In some cases, the device may achieve volumetric resolution in the nanoliter range through the use of precision microfluidic flow sensors and controlled chamber geometries. The automated nature of the device allows for extended monitoring periods yvithout manual intervention, enabling characterization of long-term syvelling behaviors and degradation processes that may occur over hours or days.

[0063] The technical approach represents a departure from conventional material characterization methods by combining microfluidic fluid handling with automated dataacquisition systems. This integration addresses the technical problem of achieving high- resolution, real-time monitoring of material swelling characteristics while maintaining precise control over testing conditions. The device architecture enables parallel testing of multiple samples, increasing throughput compared to sequential manual testing approaches.

[0064] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The microfluidic approach may be adapted for characterization of various material types including natural polymers, synthetic hydrogels, composite materials, and biological tissues, providing a versatile platform for material science research and quality control applications.

[0065] Sample Chamber Assembly and Components

[0066] Referring to FIG. 10, a sample chamber may be configured as a cylindrical container with a designated sample volume area positioned centrally within the structure. The sample chamber may be designed to accommodate samples of soft-tissue materials during testing procedures, providing a controlled environment for fluid exposure and measurement operations. In some cases, the sample chamber may include an inlet / outlet port positioned at the bottom portion of the chamber, which sen es dual functions during testing operations. During filling phases, the port may allow test fluid to enter the chamber and immerse the sample material. During measurement phases, the same port may facilitate fluid exit, ensuring controlled and consistent fluid flow throughout the testing procedure.

[0067] The sample chamber may include a securing mechanism positioned on the side of the chamber structure. The securing mechanism may be configured to hold the sample material in place during testing operations, preventing sample displacement that could affect measurement accuracy. In some cases, the securing mechanism may be adjustable to accommodate samples of various sizes and shapes, providing versatility for testing different ty pes of soft-tissue materials including hydrogels, polymers, and biomaterials.

[0068] Referring to FIG. 11, a sample chamber assembly 1 may be constructed from multiple discrete components arranged in a vertical configuration. The sample chamber assembly 1 may comprise a sample chamber top 18, a sample chamber middle 19, and a sample chamber bottom 20. The sample chamber top 18 may be positioned at the uppermost portion of the sample chamber assembly 1 and may provide the upper interface for the chamber structure. The sample chamber top 18 may include threading or locking mechanisms to ensure a secure seal with the sample chamber middle 19, preventing fluid leakage during testing operations.

[0069] The sample chamber middle 19 may form the central body of the sample chamber assembly 1 and may define the primary containment volume for holding samples during testing operations. In some cases, the sample chamber middle 19 may be cylindrical in shape to facilitate even distribution of fluid around the sample material. The sample chamber bottom 20 may constitute the lower portion of the sample chamber assembly 1 and may provide the base structure for the chamber. The sample chamber bottom 20 may include an outlet port that aligns with connection points of the sample chamber top 18, allowing for controlled flow of fluid into and out of the chamber.

[0070] The modular design of the sample chamber assembly 1 may allow for easy assembly and disassembly of the sample chamber top 18, sample chamber middle 19, and sample chamber bottom 20. This modularity may be advantageous for cleaning, maintenance, or replacement of individual components, ensuring that the sample chamber assembly 1 may be maintained in optimal condition for accurate and repeatable swelling tests.

[0071] In some cases, the sample chamber may be configured with volumes ranging from 1 nanoliter to 10 liters, depending on the application requirements and sample size. For nanohter-scale applications, the sample chamber may incorporate precision-machined features and microfluidic interfaces to achieve accurate volume control. For larger volume applications up to 10 liters, the sample chamber may include reinforced structural elements and enhanced sealing mechanisms to maintain containment integrity under various testing conditions.

[0072] The sample chamber may be constructed from biocompatible and chemically resistant materials to ensure compatibility with a wide range of test fluids and biological samples. In some cases, materials such as borosilicate glass, medical-grade stainless steel, or chemically inert polymers including polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), or cyclic olefin copolymer (COC) may be used in the construction of the sample chamber. The selection of materials may depend on the specific chemical compatibility requirements, temperature ranges, and optical properties needed for the testing application.

[0073] In some cases, the sample chamber may be constructed from transparent or semi-transparent materials for visual monitoring of the sample during testing procedures. Transparent materials such as borosilicate glass, polycarbonate, polymethyl methacrylate (PMMA), or optical-grade polystyrene may enable real-time visual observation of sample swelling behavior without interrupting the testing process. The transparency may allow operators to monitor sample positioning, fluid levels, and swelling progression throughout the testing cycle.

[0074] Referring to FIG. 12 and FIG. 13, multiple orthogonal views of sample chamber components may illustrate the structural design and dimensional characteristics of the chamber. The top view may show the circular opening of the chamber, providing access for sample insertion and fluid introduction. The bottom view may display the base of the chamber, including outlet port configurations for fluid drainage. The front and right views may reveal the cylindrical profile and dimensional characteristics of the chamber, while the isometric view may provide a three-dimensional representation showing spatial relationships between inlet and outlet ports.

[0075] The sample chamber may include filter elements positioned above and / or below the sample to allow fluid exchange while retaining the sample material in place during testing. In some cases, the filter elements may comprise porous membranes, mesh screens, or perforated plates with pore sizes ranging from 0. 1 micrometers to 500 micrometers. The filter elements may prevent debris, particulates, or sample fragments from interfering with measurement accuracy while allowing free passage of test fluids. Filter materials may include poly ethersulfone (PES), poly vinylidene fluoride (PVDF), nylon, or stainless steel mesh, selected based on chemical compatibility and pore size requirements.

[0076] Referring to FIG. 14, the sample chamber assembly 1 may be integrated with an outlet solenoid 2 that provides controlled fluid egress from the sample chamber. The outlet solenoid 2 may be positioned on the side of the sample chamber assembly 1 and may feature a compact design with connection ports for integration into the microfluidic circuit. The spatial relationship between the sample chamber assembly 1 and the outlet solenoid 2 may demonstrate how the solenoid mounts to the chamber wall to facilitate controlled fluid flow during testing procedures.

[0077] In some cases, the sample chamber assembly 1 may be configured for parallel testing of multiple samples, enabling simultaneous characterization of different materials or testing conditions. Multiple sample chamber assemblies 1 may be integrated into a single device platform, each with independent fluid control and measurement capabilities. The parallel configuration may increase testing throughput compared to sequential testing approaches and may allow for comparative analysis of different sample materials under identical testing conditions.

[0078] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The sample chamber design may be adapted for different material types, sample sizes, and testing requirements while maintaining the fundamental principles of controlled fluid exposure andvolumetric measurement.

[0079] Flow Chamber Assembly and Fluid Management

[0080] Referring to FIG. 8, a flow chamber assembly 4 may be configured to facilitate controlled fluid flow and interaction with sample materials during testing operations. The flow chamber assembly 4 may comprise a flow chamber top 22 and a flow chamber bottom 21 that together form the main structural components for managing fluid dynamics within the microfluidic circuit. The flow chamber top 22 may be positioned above the flow chamber bottom 21 and may feature an inlet port located on the upper portion for fluid entry from the microfluidic circuit.

[0081] The flow chamber top 22 may be designed to receive fluid from upstream components of the microfluidic circuit and direct the fluid into the flow chamber assembly 4. In some cases, the inlet port of the flow chamber top 22 may be configured with standardized connections including luer-lock fittings, barbed connectors, or threaded ports with diameters ranging from 0.5 millimeters to 10 millimeters to accommodate various tubing sizes and flow requirements. The flow chamber top 22 may include internal flow channels or distribution features to promote uniform fluid distribution across the chamber volume.

[0082] The flow chamber bottom 21 may be configured to collect fluid from the flow chamber top 22 and may include an outlet port positioned at the lower portion for fluid exit. The outlet port of the flow chamber bottom 21 may facilitate controlled fluid discharge from the flow chamber assembly 4, directing fluid toward downstream components such as flow sensors or collection reservoirs. In some cases, the outlet port may incorporate flow restriction features or orifice plates to regulate fluid flow rates and maintain consistent pressure conditions within the flow chamber assembly 4.

[0083] The flow chamber top 22 and flow chamber bottom 21 may be designed to form a sealed chamber when assembled together, preventing fluid leakage and maintaining controlled environmental conditions during testing procedures. In some cases, sealing may be achieved through O-ring seals, gasket interfaces, or precision-machined mating surfaces with tolerances ranging from ±0.01 millimeters to ±0. 1 millimeters. The sealing mechanism may be selected based on the operating pressure range, which may vary from atmospheric pressure to pressures up to 10 bar depending on the testing requirements.

[0084] Referring to FIG. 9. the flow chamber assembly 4 may feature a cylindrical structure with an inlet port positioned on the upper portion and an outlet port located on the lower portion. The vertical alignment of the inlet and outlet ports may create a linear flowpath through the flow chamber assembly 4, facilitating controlled fluid movement with minimal turbulence and flow resistance. The cylindrical design may provide a contained volume for fluid processing and measurement, with internal volumes ranging from 10 microliters to 100 milliliters depending on the application requirements.

[0085] The flow chamber assembly 4 may be constructed from materials that provide chemical resistance and compatibility with various test fluids. In some cases, materials such as borosilicate glass, medical-grade stainless steel, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), or poly etheretherketone (PEEK) may be used in the construction of the flow chamber top 22 and flow chamber bottom 21. The material selection may depend on the chemical compatibility requirements, temperature ranges from -20°C to 150°C, and pressure ratings needed for the specific testing application.

[0086] The flow chamber assembly 4 may incorporate a modular design that allows for easy assembly and disassembly of the flow chamber top 22 and flow chamber bottom 21. The modular configuration may facilitate cleaning, maintenance, sterilization, or replacement of individual components without requiring replacement of the entire flow chamber assembly 4. In some cases, the modular design may include quick-release mechanisms, threaded connections, or clamp-based fastening systems that enable rapid assembly and disassembly operations.

[0087] The modular design may include alignment features such as guide pins, keyed interfaces, or precision-machined registration surfaces to ensure proper positioning of the flow chamber top 22 relative to the flow chamber bottom 21 during assembly. These alignment features may prevent misalignment that could result in flow irregularities or measurement inaccuracies. In some cases, the alignment features may include visual indicators or tactile feedback mechanisms to confirm proper assembly.

[0088] The flow chamber assembly 4 may be integrated with the microfluidic circuit through connection interfaces that provide secure and leak-free fluid pathways. The connection interfaces may include standardized fittings, compression fittings, or custom- designed connectors that mate with tubing, valves, or other microfluidic components. In some cases, the connection interfaces may incorporate swivel joints or flexible couplings to accommodate thermal expansion, vibration, or minor misalignments in the microfluidic circuit.

[0089] The flow chamber assembly 4 may be configured to accommodate various sample chamber configurations, including integration with the sample chamber assembly 1 described previously. The flow chamber assembly 4 may be positioned downstream of thesample chamber assembly 1 to receive fluid that has interacted with sample materials, or may be configured in parallel arrangements for comparative testing applications. The positioning and integration of the flow chamber assembly 4 within the overall system architecture may be selected based on the specific measurement requirements and testing protocols.

[0090] In some cases, the flow chamber assembly 4 may include internal features such as baffles, flow distributors, or mixing elements to promote uniform fluid flow and enhance measurement accuracy. These internal features may be machined, molded, or additively manufactured as integral components of the flow chamber top 22 or flow chamber bottom 21. The internal features may be designed to minimize dead volumes, reduce flow stagnation, and promote consistent fluid residence times within the flow chamber assembly 4.

[0091] The flow chamber assembly 4 may be configured for operation across a range of flow rates from 1 microliter per minute to 1000 milliliters per minute, depending on the pump capacity and system requirements. The flow rate range may be selected based on the sample material characteristics, measurement sensitivity requirements, and testing duration. Higher flow rates may be used for rapid filling or flushing operations, while lower flow rates may be employed for precise measurement phases where volumetric accuracy is paramount.

[0092] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The flow chamber assembly 4 design may be adapted for different fluid types, flow rate requirements, and integration needs while maintaining the fundamental principles of controlled fluid handling and modular construction.

[0093] Solenoid Valve System for Fluid Control

[0094] Referring to FIG. 2, FIG. 3, FIG. 4, and FIG. 5, the microfluidic circuit may incorporate a comprehensive solenoid valve system that provides precise control over fluid flow into and out of the sample chamber assembly 1 and flow chamber assembly 4. The solenoid valve system may comprise multiple electronically actuated valves including an inlet solenoid 3, an outlet solenoid 2, a bleeder solenoid 5, and an outlet solenoid 6, each configured to regulate specific fluid pathways within the microfluidic circuit.

[0095] The inlet solenoid 3 may be positioned to control the entry' of fluid into the sample chamber assembly f during filling operations. In some cases, the inlet solenoid 3 may be configured as a normally closed valve that opens upon electrical activation to allow fluid flow from upstream components of the microfluidic circuit into the sample chamber assembly1. The inlet solenoid 3 may operate at voltages ranging from 12 volts to 24 volts DC, with response times from 5 milliseconds to 50 milliseconds for opening and closing operations. The inlet solenoid 3 may incorporate a spring-return mechanism that ensures positive closure when electrical power is removed, preventing uncontrolled fluid flow during system shutdown or power interruption conditions.

[0096] The outlet solenoid 2 may be configured to regulate the exit of fluid from the sample chamber assembly 1 during draining or measurement phases of the testing cycle. In some cases, the outlet solenoid 2 may be positioned downstream of the sample chamber assembly 1 and may control fluid flow toward the flow chamber assembly 4 or waste collection systems. The outlet solenoid 2 may feature a normally closed configuration that opens upon electrical activation, allowing controlled drainage of the sample chamber assembly 1 at predetermined flow rates. The outlet solenoid 2 may be constructed with corrosion-resistant materials including stainless steel, brass, or polymer components to ensure compatibility with various test fluids and biological samples.

[0097] Referring to FIG. 2 and FIG. 4. the bleeder solenoid 5 may be associated with the flow- chamber assembly 4 and may provide controlled venting or pressure relief during fluid handling operations. The bleeder solenoid 5 may be configured to release trapped air or excess pressure from the flow7chamber assembly 4, ensuring consistent fluid flow characteristics and preventing pressure buildup that could affect measurement accuracy. In some cases, the bleeder solenoid 5 may operate in coordination with other solenoid valves to maintain optimal pressure conditions within the microfluidic circuit during filling, draining, and measurement phases.

[0098] The outlet solenoid 6 may be positioned to control fluid discharge from the flow chamber assembly 4 toward downstream components such as flow sensors, collection reservoirs, or waste containers. The outlet solenoid 6 may work in conjunction with the bleeder solenoid 5 to maintain desired fluid dynamics within the flow chamber assembly 4 during testing operations. In some cases, the outlet solenoid 6 may be configured with variable flow control capabilities, allowing adjustment of fluid discharge rates from 1 microliter per minute to 1000 microliters per minute depending on the testing requirements and sample characteristics.

[0099] The solenoid valve system may incorporate three-way valves configured as electronically actuated components via solenoid or stepper motor mechanisms. In some cases, three-way valves may provide switching capabilities between multiple fluid pathways, enabling complex flow- routing and operational sequences within the microfluidic circuit. Thethree-way valves may be configured in normally closed, normally open, or universal configurations depending on the specific flow control requirements and fail-safe operational needs.

[0100] The solenoid valves may be constructed with wetted materials selected for chemical compatibility with test fluids including aqueous solutions, organic solvents, and biological media. In some cases, wetted materials may include polytetrafluoroethylene (PTFE), perfluoroalkoxy (PF A), polyvinylidene fluoride (PVDF), polyetheretherketone (PEEK), or medical-grade stainless steel. The material selection may depend on the chemical resistance requirements, temperature ranges from -10°C to 80°C, and biocompatibility standards for the specific testing application.

[0101] The solenoid valve system may feature low dead volume designs to minimize fluid retention and cross-contamination between testing cycles. In some cases, the dead volume of individual solenoid valves may range from 0.1 microliters to 10 microliters, depending on the valve size and internal geometry. The low dead volume design may be achieved through optimized flow path geometries, minimal internal cavities, and streamlined valve seat configurations that reduce fluid stagnation and facilitate complete flushing during cleaning operations.

[0102] The inlet solenoid 3, outlet solenoid 2, bleeder solenoid 5, and outlet solenoid 6 may be integrated with position feedback sensors to provide confirmation of valve state during operation. In some cases, position feedback may be achieved through magnetic reed swatches, Hall effect sensors, or optical position indicators that detect valve stem position and provide electrical signals to the control system. The position feedback capability may enable diagnostic monitoring of valve performance and detection of valve failure conditions that could affect testing accuracy.

[0103] The solenoid valve system may incorporate pressure rating capabilities ranging from vacuum conditions to pressures up to 10 bar, depending on the valve construction and sealing mechanisms. Higher pressure ratings may be achieved through reinforced valve bodies, enhanced sealing systems, and robust actuator mechanisms capable of overcoming increased fluid pressures. The pressure rating selection may depend on the pump capabilities, system operating pressures, and safety requirements for the specific testing application.

[0104] The solenoid valves may feature rapid response characteristics with opening times ranging from 2 milliseconds to 20 milliseconds and closing times from 3 milliseconds to 30 milliseconds. The rapid response capability may enable precise timing control for fluidhandling operations, allowing accurate measurement of volumetric changes and coordination of complex testing sequences. In some cases, the response time may be optimized through selection of actuator mechanisms, valve geometry, and electrical drive characteristics.

[0105] The solenoid valve system may be configured for automated operation under control of a microcontroller unit 16 that coordinates valve actuation sequences based on programmed testing protocols. The microcontroller unit 16 may provide electrical drive signals to the solenoid valves through driver circuits that amplify control signals and provide appropriate voltage and current levels for valve operation. In some cases, the driver circuits may incorporate protection features including overcurrent protection, thermal shutdown, and reverse polarity protection to ensure reliable valve operation and prevent damage from electrical faults.

[0106] The solenoid valve system may incorporate manual override capabilities that allow operator intervention during testing procedures or maintenance operations. Manual override may be achieved through mechanical actuators, manual valve stems, or electrical bypass switches that enable valve operation independent of the automated control system. The manual override capability may provide operational flexibility and enable troubleshooting of system malfunctions or testing protocol modifications.

[0107] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The solenoid valve system design may be adapted for different fluid types, pressure requirements, and control specifications while maintaining the fundamental principles of precise fluid flow' control and automated operation.

[0108] Three-Way Valve Network and Flow Routing

[0109] Referring to FIG. 2, FIG. 4, and FIG. 5, the microfluidic circuit may incorporate a three-way valve network that provides sophisticated flow' routing capabilities and enables automated switching between different operational modes during testing procedures. The three-way valve network may comprise multiple electronically actuated valves including a three-way valve 8, a three-way valve 10. and a three-way valve 12, each configured to direct fluid flow through specific pathways within the microfluidic circuit and coordinate complex testing sequences.

[0110] The three-way valve 8 may be positioned within the measurement circuit to control fluid routing between the sample chamber assembly 1 and downstream measurement components. In some cases, the three-way valve 8 may be configured as a two-position.three-port valve that switches fluid flow between two inlet pathways and a single outlet pathway, or alternatively between a single inlet pathway and two outlet pathways. The three- way valve 8 may operate through solenoid actuation, stepper motor control, or pneumatic actuation mechanisms that provide rapid switching capabilities with response times ranging from 10 milliseconds to 100 milliseconds.

[0111] The three-way valve 10 may be integrated into the measurement circuit to provide additional flow routing options and enable complex fluid handling sequences. In some cases, the three-way valve 10 may work in coordination with the three-way valve 8 to create multiple flow pathway configurations that support different phases of the testing cycle including filling, measurement, and cleaning operations. The three-way valve 10 may feature a normally closed configuration that directs fluid through a default pathway when electrical power is not applied, ensuring predictable flow routing during system startup or power interruption conditions.

[0112] The three-way valve 12 may be specifically configured to manage air pressure within the sample chamber assembly 1, providing controlled introduction of ambient air or high-pressure air to facilitate sample drying or saturation as part of the testing protocol. In some cases, the three-way valve 12 may switch between atmospheric pressure connection and pressurized air supply connection, allowing precise control of the sample environment during different phases of the testing cycle. The three-way valve 12 may incorporate pressure regulation capabilities ranging from vacuum conditions to pressures up to 5 bar, enabling controlled drying operations that remove surface moisture from samples without affecting the underlying material structure.

[0113] Referring to FIG. 19, FIG. 21, FIG. 23, FIG. 24, and FIG. 25, the three-way valve network may include a 3V 101 that provides flow control within the microfluidic circuit. The 3 V 101 may be positioned upstream of other valve components and may control fluid routing from reservoir systems toward sample chambers and measurement circuits. In some cases, the 3V 101 may be configured as a diverter valve that switches fluid flow7between different operational pathways, enabling automated selection of fluid sources or routing tow ard different sample chambers in multi-sample configurations.

[0114] The three-w ay valve network may be constructed with wetted materials selected for chemical compatibility' with various test fluids including aqueous solutions, buffer systems, organic solvents, and biological media. In some cases, wetted materials may include polytetrafluoroethylene (PTFE). perfluoroalkoxy (PFA), poly vinylidene fluoride (PVDF), poly etheretherketone (PEEK), polypropylene (PP), polyethylene (PE), or medical-grade stainless steel including 316L stainless steel. The material selection may depend on the chemical resistance requirements, temperature ranges from -20°C to 120°C, and biocompatibility standards for the specific testing application.

[0115] The three-way valves may feature low dead volume designs to minimize fluid retention and cross-contamination between testing cycles. In some cases, the dead volume of individual three-way valves may range from 0.5 microliters to 50 microliters, with more precise applications requiring dead volumes from 0. 1 microliters to 5 microliters. The low dead volume design may be achieved through optimized flow path geometries, minimal internal cavities, and streamlined valve seat configurations that reduce fluid stagnation and facilitate complete flushing during cleaning operations.

[0116] The three-way valve network may incorporate position feedback mechanisms that provide confirmation of valve state during operation. In some cases, position feedback may be achieved through magnetic reed switches, Hall effect sensors, optical position indicators, or potentiometric position sensors that detect valve stem or rotor position and provide electrical signals to the microcontroller unit 16. The position feedback capability may enable diagnostic monitoring of valve performance, detection of valve failure conditions, and verification of proper flow routing during automated testing sequences.

[0117] The three-way valve 8, three-way valve 10, three-way valve 12, and 3V 101 may be configured for coordinated operation under control of the microcontroller unit 16 that manages valve actuation sequences based on programmed testing protocols. The microcontroller unit 16 may provide electrical drive signals to the three-way valves through driver circuits that amplify control signals and provide appropriate voltage and current levels for valve operation. In some cases, the driver circuits may incorporate protection features including overcurrent protection, thermal shutdown, reverse polarity protection, and short- circuit protection to ensure reliable valve operation and prevent damage from electrical faults.

[0118] The three-way valve network may enable multiple operational modes including filling mode, measurement mode, cleaning mode, and standby mode. During filling mode, the three-way valve network may route fluid from reservoir systems through the sample chamber assembly 1 to achieve controlled sample immersion. During measurement mode, the valve network may direct fluid flow through measurement circuits while isolating the sample chamber assembly 1 from upstream fluid sources. During cleaning mode, the valve network may route cleaning solutions through all fluid pathways to remove residual samples and prevent cross-contamination between testing cycles.

[0119] The three-way valves may feature pressure rating capabilities ranging fromvacuum conditions to pressures up to 15 bar, depending on the valve construction and sealing mechanisms. Higher pressure ratings may be achieved through reinforced valve bodies, enhanced sealing systems including O-ring seals, gasket interfaces, or metal-to-metal sealing, and robust actuator mechanisms capable of overcoming increased fluid pressures. The pressure rating selection may depend on the pump capabilities, system operating pressures, and safety requirements for the specific testing application.

[0120] The three-way valve network may incorporate rapid response characteristics with switching times ranging from 5 milliseconds to 50 milliseconds for solenoid-actuated valves and 100 milliseconds to 1000 milliseconds for stepper motor-actuated valves. The rapid response capability may enable precise timing control for fluid handling operations, allowing accurate measurement of volumetric changes and coordination of complex testing sequences involving multiple sample chambers or measurement circuits.

[0121] The three-way valves may be configured with different port configurations including common inlet with two outlets, two inlets with common outlet, or universal configurations that support bidirectional flow routing. The port configuration selection may depend on the specific flow routing requirements, system architecture, and operational flexibility needed for the testing application. In some cases, universal three-way valves may provide maximum operational flexibility by supporting multiple flow routing configurations through software control of valve position.

[0122] The three-way valve network may incorporate manual override capabilities that allow operator intervention during testing procedures or maintenance operations. Manual override may be achieved through mechanical actuators, manual valve stems, electrical bypass switches, or software-based manual control interfaces that enable valve operation independent of the automated control system. The manual override capability may provide operational flexibility and enable troubleshooting of system malfunctions or testing protocol modifications.

[0123] The three-way valve netw ork may be configured for automated diagnostic testing that verifies proper valve operation and flow routing accuracy. Diagnostic testing may include valve cycling tests, flow verification tests, and leak detection tests that confirm valve performance and identify potential maintenance requirements. In some cases, diagnostic testing may be performed automatically during system startup, between testing cycles, or on a scheduled maintenance basis to ensure continued system reliability and measurement accuracy.

[0124] Those skilled in the art will recognize that various modifications andvariations can be made without departing from the spirit and scope of the invention. The three-way valve network design may be adapted for different fluid types, pressure requirements, flow routing configurations, and control specifications while maintaining the fundamental principles of precise flow control and automated operation.

[0125] Multi-Port Valve System for Advanced Flow Control

[0126] Referring to FIG. 19, FIG. 20, FIG. 21. FIG. 23, FIG. 24, and FIG. 25, the microfluidic circuit may incorporate a multi-port valve 102 that provides sophisticated flow routing capabilities and enables sequential operation of multiple sample chambers and complex fluid management protocols. The multi-port valve 102 may be positioned downstream of the 3V 101 and may serve as a central switching component that directs fluid flow between multiple pathways within the microfluidic circuit. In some cases, the multi-port valve 102 may be configured as a rotary valve, linear actuator valve, or electronically controlled manifold that provides switching between 3 to 16 different flow pathways depending on the system configuration and testing requirements.

[0127] The multi-port valve 102 may enable automated selection between multiple sample chambers, allowing sequential testing of different materials or parallel operation of multiple testing protocols. In some cases, the multi-port valve 102 may switch fluid flow between different sample chamber assemblies, enabling comparative analysis of multiple samples under identical testing conditions while maintaining isolation between individual testing chambers. The multi-port valve 102 may operate through stepper motor control, servo motor actuation, or pneumatic positioning mechanisms that provide precise positioning accuracy ranging from ±0. 1 degrees to ±1.0 degrees for rotary configurations or ±0.01 millimeters to ±0. 1 millimeters for linear configurations.

[0128] Referring to FIG. 20, the multi-port valve 102 may coordinate with other system components to enable complex operational sequences involving multiple sample chambers and measurement circuits. The multi-port valve 102 may work in conjunction with the 3V 101 to create sophisticated flow routing patterns that support filling, measurement, and cleaning operations across multiple sample chambers in a coordinated sequence. In some cases, the multi-port valve 102 may enable parallel operation where multiple sample chambers are filled simultaneously, or sequential operation where sample chambers are processed individually in a predetermined order.

[0129] The multi-port valve 102 may be constructed with wetted materials selected for chemical compatibility with various test fluids including aqueous solutions, buffersystems, organic solvents, biological media, and cleaning solutions. In some cases, wetted materials may include polytetrafluoroethylene (PTFE), perfluoroalkoxy (PF A). polyvinylidene fluoride (PVDF), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyoxymethylene (POM), or medical-grade stainless steel including 316L stainless steel or Hastelloy C-276. The material selection may depend on the chemical resistance requirements, temperature ranges from -40°C to 150°C, and biocompatibility standards for the specific testing application.

[0130] Referring to FIG. 21 and FIG. 25, the multi-port valve 102 may be integrated with the microcontroller unit 16 to provide automated control of flow routing based on programmed testing protocols. The microcontroller unit 16 may send positioning commands to the multi-port valve 102 through driver circuits that provide appropriate voltage and current levels for valve actuation. In some cases, the driver circuits may incorporate stepper motor drivers, servo motor controllers, or pneumatic valve controllers that translate digital control signals into mechanical positioning of the multi-port valve 102.

[0131] The multi-port valve 102 may feature low dead volume designs to minimize fluid retention and cross-contamination between different flow pathways. In some cases, the dead volume of the multi-port valve 102 may range from 1 microliter to 500 microliters, with precision applications requiring dead volumes from 0.5 microliters to 50 microliters. The low dead volume design may be achieved through optimized flow path geometries, minimal internal cavities, streamlined valve seat configurations, and precision-machined flow channels that reduce fluid stagnation and facilitate complete flushing during cleaning operations.

[0132] The multi-port valve 102 may incorporate position feedback mechanisms that provide confirmation of valve position during operation. In some cases, position feedback may be achieved through optical encoders, magnetic encoders, potentiometric position sensors, or Hall effect sensors that detect valve rotor or actuator position and provide electrical signals to the microcontroller unit 16. The position feedback capability may enable diagnostic monitoring of valve performance, detection of valve positioning errors, and verification of proper flow routing during automated testing sequences.

[0133] Referring to FIG. 22, the multi-port valve 102 may enable sequential operation of multiple sample chambers in a coordinated testing protocol. The multi-port valve 102 may switch between different sample chambers to enable filling, measurement, and draining operations in a predetermined sequence that maximizes testing throughput while maintaining measurement accuracy. In some cases, the multi-port valve 102 may coordinatewith multiple three-way valves to create complex flow routing patterns that support simultaneous operation of different testing phases across multiple sample chambers.

[0134] The multi-port valve 102 may feature pressure rating capabilities ranging from vacuum conditions to pressures up to 20 bar, depending on the valve construction and sealing mechanisms. Higher pressure ratings may be achieved through reinforced valve bodies, enhanced sealing systems including O-ring seals, face seals, or metal-to-metal sealing, and robust actuator mechanisms capable of overcoming increased fluid pressures. The pressure rating selection may depend on the pump capabilities, system operating pressures, and safety requirements for the specific testing application.

[0135] The multi-port valve 102 may incorporate rapid switching characteristics with positioning times ranging from 50 milliseconds to 2000 milliseconds for stepper motor- actuated configurations and 20 milliseconds to 500 milliseconds for pneumatic-actuated configurations. The rapid switching capability may enable precise timing control for fluid handling operations, allowing accurate coordination of complex testing sequences involving multiple sample chambers, measurement circuits, and cleaning protocols.

[0136] Referring to FIG. 23 and FIG. 24, the multi-port valve 102 may be configured with different port configurations including 3-port, 4-port, 6-port, 8-port, or 12- port arrangements depending on the system requirements and testing complexity7. The port configuration selection may depend on the number of sample chambers, measurement circuits, cleaning pathways, and waste collection systems integrated into the microfluidic circuit. In some cases, larger port configurations may provide greater operational flexibility by supporting multiple simultaneous flow pathways and enabling more complex testing protocols.

[0137] The multi-port valve 102 may enable multiple operational modes including sequential testing mode, parallel testing mode, calibration mode, and maintenance mode. During sequential testing mode, the multi-port valve 102 may route fluid to individual sample chambers in a predetermined order, allowing systematic testing of multiple samples with controlled timing intervals. During parallel testing mode, the multi-port valve 102 may enable simultaneous fluid delivery to multiple sample chambers, allowing comparative testing under identical conditions. During calibration mode, the multi-port valve 102 may route calibration fluids through measurement circuits to verify system accuracy and performance.

[0138] The multi-port valve 102 may incorporate automated cleaning capabilities that route cleaning solutions through all flow pathways to remove residual samples and prevent cross-contamination between testing cycles. In some cases, the multi-port valve 102may coordinate cleaning sequences that include rinse cycles, detergent cycles, and sterilization cycles using different cleaning solutions routed through specific pathways. The cleaning protocols may be programmed into the microcontroller unit 16 and executed automatically between testing cycles or on a scheduled maintenance basis.

[0139] The multi-port valve 102 may be configured for modular expansion that allows addition of additional sample chambers or measurement circuits without requiring replacement of the entire valve system. In some cases, modular expansion may be achieved through stackable valve modules, expandable manifold systems, or cascaded valve configurations that provide scalable flow routing capabilities. The modular design may enable system customization for different testing requirements and future expansion of testing capabilities.

[0140] The multi-port valve 102 may incorporate diagnostic capabilities that monitor valve performance and detect potential maintenance requirements. Diagnostic capabilities may include position verification tests, flow verification tests, leak detection tests, and response time measurements that confirm proper valve operation. In some cases, diagnostic testing may be performed automatically during system startup, between testing cycles, or on a scheduled maintenance basis to ensure continued system reliability and measurement accuracy.

[0141] The multi-port valve 102 may feature manual override capabilities that allow operator intervention during testing procedures or maintenance operations. Manual override may be achieved through mechanical actuators, manual positioning controls, electrical bypass switches, or software-based manual control interfaces that enable valve operation independent of the automated control system. The manual override capability may provide operational flexibility and enable troubleshooting of system malfunctions or testing protocol modifications.

[0142] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The multi-port valve 102 design may be adapted for different fluid types, pressure requirements, port configurations, and control specifications while maintaining the fundamental principles of sophisticated flow- routing and automated operation.

[0143] Pump Systems for Fluid Circulation

[0144] Referring to FIG. 2. FIG. 3, FIG. 4, and FIG. 5, the microfluidic circuit may incorporate multiple pump systems that provide precise fluid circulation capabilities andenable both rapid filling operations and controlled measurement procedures. The pump systems may comprise a pump 9, a high-flow pump 14, and a low-flow pump 15, each configured with different flow rate capabilities to support various phases of the testing cycle. In some cases, the pump systems may operate using peristaltic, syringe, diaphragm, or gear mechanisms depending on the specific flow rate requirements, fluid compatibility' needs, and precision demands of the testing application.

[0145] The pump 9 may be positioned within the microfluidic circuit to provide general fluid circulation capabilities and may be configured for flow rates ranging from 100 nanoliters per minute to 1 0 microliters per minute. In some cases, the pump 9 may operate across a broader flow rate range from 50 nanoliters per minute to 500 microliters per minute, with precision applications requiring flow rates from 100 nanoliters per minute to 10 microliters per minute. The pump 9 may be constructed using peristaltic mechanisms that provide gentle fluid handling without contamination of the fluid pathway, making the pump 9 suitable for biological samples and sensitive materials that may be damaged by direct contact with pump components.

[0146] The high-flow pump 14 may be configured to provide rapid filling capabilities for the sample chamber assembly 1 and may operate at flow rates ranging from 500 microliters per minute to 50 milliliters per minute. In some cases, the high-flow pump 14 may achieve flow rates from 100 microliters per minute to 100 milliliters per minute, with high-throughput applications requiring flow rates from 1 milliliter per minute to 20 milliliters per minute. The high-flow pump 14 may utilize syringe pump mechanisms that provide accurate volumetric delivery’ and precise flow control during filling operations, enabling rapid sample chamber filling while maintaining measurement accuracy.

[0147] The low-flow pump 15 may be designed for precise measurement operations and may operate at flow rates ranging from 1 microliter per minute to 100 microliters per minute. In some cases, the low-flow pump 15 may provide flow rates from 100 nanoliters per minute to 500 microliters per minute, with precision measurement applications requiring flow rates from 500 nanoliters per minute to 50 microliters per minute. The low-flow pump 15 may employ diaphragm pump mechanisms that provide pulsation-free flow delivery and enhanced flow stability during measurement phases where volumetric accuracy may be paramount for detecting small changes in sample swelling characteristics.

[0148] Referring to FIG. 19, FIG. 21, FIG. 23. FIG. 24, and FIG. 25, the microfluidic circuit may incorporate a pump 103 that provides fluid circulation capabilities within systems configured with the multi-port valve 102 and the 3V 101. The pump 103 maybe positioned downstream of the multi-port valve 102 and may drive fluid circulation through the sample chamber 104 and associated measurement circuits. In some cases, the pump 103 may operate at flow rates ranging from 1 microliter per minute to 10 milliliters per minute, with precision applications requiring flow rates from 100 nanoliters per minute to 1 milliliter per minute.

[0149] The pump systems may be constructed with wetted materials selected for chemical compatibility with various test fluids including aqueous solutions, buffer systems, organic solvents, biological media, and cleaning solutions. In some cases, wetted materials may include polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), polyvinylidene fluoride (PVDF), poly etheretherketone (PEEK), fluorinated ethylene propylene (FEP), or medicalgrade stainless steel including 316L stainless steel. The material selection may depend on the chemical resistance requirements, temperature ranges from -20°C to 80°C, and biocompatibility standards for the specific testing application.

[0150] The pump 9, high-flow pump 14, low-flow pump 15, and pump 103 may incorporate gear pump mechanisms that provide consistent flow delivery and enhanced pressure capabilities for applications requiring higher system pressures. Gear pump configurations may achieve flow' rates from 10 microliters per minute to 100 milliliters per minute with pressure capabilities ranging from 1 bar to 20 bar. In some cases, gear pump mechanisms may provide flow rate stability within ±1% of the setpoint and may incorporate flow feedback control systems that maintain consistent flow rates despite variations in system pressure or fluid viscosity.

[0151] The pump systems may feature variable speed control capabilities that enable adjustment of flow rates during different phases of the testing cycle. In some cases, variable speed control may be achieved through stepper motor drives, servo motor controls, or variable frequency drives that provide precise speed regulation and flow rate adjustment. The variable speed capability may enable the pump 9 to operate at high flow rates during filling operations and reduced flow' rates during measurement phases, optimizing both testing speed and measurement accuracy.

[0152] Referring to FIG. 2 and FIG. 4. the pump systems may be integrated with the microcontroller unit 16 to provide automated control of flow rates based on programmed testing protocols. The microcontroller unit 16 may send control signals to the pump 9, high- flow pump 14, low-flow pump 15, and pump 103 through driver circuits that provide appropriate voltage and current levels for pump operation. In some cases, the driver circuits may incorporate stepper motor drivers, servo motor controllers, or variable frequency drivesthat translate digital control signals into mechanical pump operation.

[0153] The pump systems may incorporate flow feedback mechanisms that monitor actual flow rates and provide closed-loop control for enhanced flow accuracy. In some cases, flow feedback may be achieved through integration with flow sensors that measure actual fluid flow rates and provide feedback signals to the microcontroller unit 16. The closed-loop control capability may enable automatic adjustment of pump speed to maintain target flow rates despite variations in system pressure, fluid viscosity, or temperature conditions.

[0154] The peristaltic pump mechanisms may feature replaceable tubing elements that provide easy maintenance and prevent cross-contamination between different testing applications. In some cases, peristaltic tubing may be constructed from silicone, thermoplastic elastomers, or fluoropolymer materials with inner diameters ranging from 0.25 millimeters to 6.35 millimeters. The tubing selection may depend on the flow rate requirements, chemical compatibility needs, and pressure rating specifications for the specific testing application.

[0155] The syringe pump mechanisms may incorporate precision-machined syringes with volumes ranging from 1 microliter to 100 milliliters, enabling accurate volumetric delivery for both small-scale and large-scale testing applications. In some cases, syringe pump mechanisms may achieve volumetric accuracy within ±0.1% of the programmed volume and may incorporate position feedback systems that verify syringe plunger position during operation. The syringe pump mechanisms may feature automated syringe refill capabilities that enable continuous operation during extended testing procedures.

[0156] The diaphragm pump mechanisms may provide pulsation-free flow delivery- through the use of multiple diaphragm chambers operating in coordinated sequences. In some cases, diaphragm pump mechanisms may incorporate three or more diaphragm chambers with phase-shifted operation that minimizes flow pulsations and provides smooth fluid delivery-. The diaphragm pump mechanisms may achieve flow rate stability within ±0.5% of the setpoint and may operate at pressures ranging from vacuum conditions to 10 bar.

[0157] The pump systems may incorporate pressure monitoring capabilities that detect system pressure conditions and provide feedback for pump control optimization. In some cases, pressure monitoring may be achieved through pressure transducers positioned upstream and downstream of the pump systems, providing real-time pressure data to the microcontroller unit 16. The pressure monitoring capability may enable automatic adjustment of pump operation to maintain optimal pressure conditions and prevent damage to systemcomponents or samples.

[0158] The pump systems may feature rapid response characteristics with flow rate adjustment times ranging from 100 milliseconds to 2 seconds, depending on the pump mechanism and control system configuration. The rapid response capability may enable precise timing control for fluid handling operations, allowing accurate coordination of filling, measurement, and cleaning sequences. In some cases, the rapid response may be achieved through high-resolution stepper motor controls, servo motor systems, or pneumatic actuation mechanisms that provide immediate response to control signals.

[0159] The pump 9, high-flow pump 14, low-flow pump 15, and pump 103 may be configured for coordinated operation that enables complex testing sequences involving multiple flow rates and operational phases. In some cases, coordinated operation may involve sequential activation of different pumps during filling and measurement phases, with the high-flow pump 14 providing rapid sample chamber filling followed by the low-flow pump 15 providing precise measurement flow rates. The coordinated operation may be programmed into the microcontroller unit 16 and may include timing sequences, flow rate transitions, and safety interlocks that ensure proper system operation.

[0160] The pump systems may incorporate self-priming capabilities that enable automatic removal of air bubbles and establishment of consistent fluid flow without manual intervention. In some cases, self-priming may be achieved through pump design features, integrated degassing systems, or automated priming sequences that remove air from fluid pathways before testing operations. The self-priming capability may enhance system reliability' and reduce setup time for testing procedures.

[0161] The pump systems may feature modular construction that enables easy replacement or upgrade of individual pump components without requiring replacement of the entire pump system. In some cases, modular construction may include standardized mounting interfaces, quick-disconnect fluid connections, and plug-and-play electrical connections that facilitate rapid pump replacement or system reconfiguration. The modular design may enable system customization for different testing requirements and future expansion of pump capabilities.

[0162] The pump systems may incorporate diagnostic capabilities that monitor pump performance and detect potential maintenance requirements. Diagnostic capabilities may include flow rate verification tests, pressure capability tests, response time measurements, and vibration monitoring that confirm proper pump operation. In some cases, diagnostic testing may be performed automatically during system startup, between testingcycles, or on a scheduled maintenance basis to ensure continued system reliability and measurement accuracy.

[0163] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The pump system design may be adapted for different fluid types, flow rate requirements, pressure specifications, and control configurations while maintaining the fundamental principles of precise fluid circulation and automated operation.

[0164] Flow Sensor Technology and Volumetric Measurement

[0165] Referring to FIG. 2. FIG. 3, FIG. 4, and FIG. 5, the microfluidic circuit may incorporate a flow sensor 7 that provides precise measurement capabilities for monitoring volumetric changes in fluids as they move through the system. The flow sensor 7 may be positioned downstream of the flow chamber assembly 4 and may be configured to measure the flow rate of fluids passing through the microfluidic circuit during testing operations. In some cases, the flow sensor 7 may operate using thermal sensing principles that detect heat transfer characteristics of flowing fluids to determine flow rates with enhanced accuracy and temporal resolution.

[0166] The flow sensor 7 may employ thermal-based sensing mechanisms that utilize heated sensor elements positioned within the fluid pathway to measure flow-induced heat transfer. In some cases, thermal sensing may be achieved through micro-machined thermal sensors that include heating elements and temperature sensing elements fabricated on silicon substrates using semiconductor manufacturing techniques. The thermal sensing approach may provide flow rate measurements by detecting the cooling effect of fluid flow on heated sensor elements, with the degree of cooling being proportional to the fluid flow rate.

[0167] Referring to FIG. 19 and FIG. 24, the microfluidic circuit may incorporate a flow sensor 105 that provides volumetric measurement capabilities within systems configured with the multi-port valve 102 and the sample chamber 104. The flow sensor 105 may be positioned downstream of the sample chamber 104 and may measure fluid flow rates as fluids exit the sample chamber 104 during measurement phases of the testing cycle. In some cases, the flow sensor 105 may operate using ultrasonic sensing principles that utilize acoustic wave propagation through flowing fluids to determine flow rates without direct contact with the fluid pathway.

[0168] The flow sensor 7 and the flow sensor 105 may incorporate ultrasonicsensing mechanisms that employ piezoelectric transducers positioned on opposite sides of the fluid pathway to generate and detect acoustic waves. In some cases, ultrasonic sensing maymeasure the transit time difference of acoustic waves traveling upstream and downstream through the flowing fluid, with the transit time difference being proportional to the fluid flow rate. The ultrasonic approach may provide non-invasive flow measurement that does not introduce flow restrictions or pressure drops within the microfluidic circuit.

[0169] The flow sensor 7 and the flow sensor 105 may utilize pressure differential sensing principles that measure pressure variations across flow restriction elements to determine flow rates. In some cases, pressure differential sensing may be achieved through micro-machined pressure sensors positioned upstream and downstream of calibrated orifice plates, venturi tubes, or flow nozzles that create predictable pressure drops proportional to fluid flow rates. The pressure differential approach may provide robust flow measurement capabilities that are less sensitive to fluid composition variations compared to thermal or ultrasonic sensing methods.

[0170] The flow sensor 7 and the flow sensor 105 may achieve volumetric resolution capabilities ranging from 1 microliter to 100 nanoliters, enabling detection of minute volumetric changes that correspond to sample swelling characteristics. In some cases, the flow sensor 7 and the flow sensor 105 may provide resolution capabilities down to 100 nanoliters through the use of precision-calibrated sensing elements and advanced signal processing algorithms that enhance measurement sensitivity and reduce noise interference. The 100 nanoliter resolution capability may enable detection of small-scale swelling behaviors in microscale samples or early-stage swelling kinetics that may be missed by lower-resolution measurement approaches.

[0171] The flow sensor 7 and the flow sensor 105 may be configured to achieve enhanced resolution capabilities down to 10 nanoliters through the integration of high- sensitivity sensing elements and optimized fluid pathway geometries. In some cases, 10 nanoliter resolution may be achieved through the use of micro-fabricated thermal sensors with reduced thermal mass, enhanced temperature sensitivity, and minimized thermal crosstalk between sensing elements. The 10 nanoliter resolution capability may enable characterization of nanoscale materials, single-cell sw elling behaviors, or ultra-sensitive detection of material property changes during testing procedures.

[0172] The flow sensor 7 and the flow sensor 105 may incorporate advanced sensing technologies that enable volumetric resolution capabilities down to 1 nanoliter for applications requiring ultra-high measurement sensitivity. In some cases, 1 nanoliterresolution may be achieved through the use of optical sensing methods including interferometry, laser-based particle tracking, or micro-cavity resonance techniques that detect minute changes in fluid optical properties corresponding to volumetric variations. The 1 nanoliter resolution capability may approach the theoretical limits of current sensing technologies and may enable characterization of molecular-scale swelling behaviors or detection of single-molecule interactions with material surfaces.

[0173] The flow sensor 7 may be implemented using commercially available thermal flow sensors including the Sensirion LG16-043 ID, which may be optimized for flow rates ranging from 1 microliter per minute to 80 microliters per minute. In some cases, the Sensirion LG16-043 ID may provide flow rate accuracy within ±3% of the measured value and may incorporate digital signal processing capabilities that provide calibrated flow rate outputs through standardized communication interfaces including I2C or analog voltage outputs. The Sensirion LG16-043 ID may feature biocompatible wetted materials and may be suitable for biological sample testing applications.

[0174] The flow sensor 7 and the flow sensor 105 may be implemented using precision microfluidic flow sensors including the Sensirion SLF3S-0600F, which may be configured for ultra-low flow rate applications ranging from 500 nanoliters per minute to 5 microliters per minute. In some cases, the Sensirion SLF3S-0600F may provide enhanced flow rate resolution and may incorporate advanced calibration algorithms that compensate for temperature variations, fluid property changes, and sensor drift effects. The Sensirion SLF3S- 0600F may feature low dead volume designs with internal volumes ranging from 0.5 microliters to 2 microliters.

[0175] The flow sensor 7 and the flow sensor 105 may be implemented using advanced microfluidic flow control systems including the Fluigent Flow EZ, which may provide integrated flow sensing and control capabilities with flow rates ranging from 1 microliter per minute to 1000 microliters per minute. In some cases, the Fluigent Flow EZ may incorporate pressure-based flow control mechanisms that provide closed-loop flow regulation and may include software interfaces that enable automated flow control protocols. The Fluigent Flow EZ may feature modular construction that enables integration with various microfluidic circuit configurations and may provide flow rate stability within ±0.5% of the setpoint.

[0176] The flow sensor 7 and the flow sensor 105 may be implemented using high- precision flow measurement systems including the Elveflow MFS series, which may provide nanoliter-per-minute flow rate capabilities with enhanced measurement accuracy. In somecases, the Elveflow MFS series may incorporate thermal sensing technologies with microfabricated sensor elements that provide rapid response times ranging from 10 milliseconds to 100 milliseconds. The Elveflow MFS series may feature chemical resistance to a wide range of solvents and biological fluids and may provide digital communication interfaces for integration with automated control systems.

[0177] Referring to FIG. 15, the flow sensor 7 and the flow sensor 105 may incorporate calibration methods that compensate for systematic measurement errors and enhance volumetric accuracy across different operating conditions. The calibration methods may include gravimetric calibration procedures that compare flow sensor measurements with precision balance measurements to establish correction factors for different flow rates and fluid types. In some cases, calibration may involve measurement of known fluid volumes delivered at different pump speeds, with correction algorithms applied to compensate for flow rate-dependent measurement errors.

[0178] The flow7sensor 7 and the flow sensor 105 may achieve demonstrated accuracy levels within ±0.4% of gravimetric reference measurements after application of calibration correction factors. In some cases, the accuracy levels may be achieved through multi-point calibration procedures that establish correction curves for different flow rate ranges, with linear or polynomial correction algorithms applied to raw7sensor measurements. The calibration procedures may be performed using reference fluids with known density and viscosity properties, with correction factors adjusted for different fluid types and testing conditions.

[0179] The flow sensor 7 and the flow7sensor 105 may incorporate temperature compensation mechanisms that maintain measurement accuracy across temperature ranges from 15°C to 40°C. In some cases, temperature compensation may be achieved through integrated temperature sensors that monitor fluid temperature and apply temperaturedependent correction factors to flow7rate measurements. The temperature compensation capability may be particularly relevant for thermal-based flow7sensors where sensing element performance may be affected by ambient temperature variations or fluid temperature changes during testing procedures.

[0180] The flow sensor 7 and the flow sensor 105 may feature real-time data acquisition capabilities that provide continuous monitoring of volumetric changes during sample swelling processes. In some cases, real-time data acquisition may be achieved through high-speed analog-to-digital conversion with sampling rates ranging from 10 Hz to 1000 Hz, enabling detection of rapid swelling kinetics or transient flow variations. The real-timecapabi li ty may enable capture of dynamic swelling behaviors that may be missed by discrete sampling approaches and may provide enhanced temporal resolution for kinetic analysis of material swelling characteristics.

[0181] The flow sensor 7 and the flow sensor 105 may incorporate signal filtering and processing algorithms that reduce measurement noise and enhance signal-to-noise ratios for improved measurement precision. In some cases, signal processing may include digital filtering techniques such as low-pass filtering, moving average filtering, or adaptive filtering that remove high-frequency noise while preserving flow rate signal characteristics. The signal processing algorithms may be implemented in the microcontroller unit 16 or in dedicated signal processing hardware integrated with the flow sensor 7 and the flow sensor 105.

[0182] The flow sensor 7 and the flow sensor 105 may feature automated zeroing and span calibration capabilities that maintain measurement accuracy over extended operating periods. In some cases, automated calibration may be performed during system startup, between testing cycles, or on a scheduled maintenance basis using reference flow conditions or calibration fluids. The automated calibration capability may compensate for sensor drift effects, contamination buildup, or component aging that could affect measurement accuracy over time.

[0183] The flow sensor 7 and the flow sensor 105 may incorporate diagnostic capabilities that monitor sensor performance and detect potential measurement errors or maintenance requirements. In some cases, diagnostic capabilities may include sensor response verification tests, signal quality assessments, or comparison with redundant measurement methods that confirm proper sensor operation. The diagnostic information may be provided to the microcontroller unit 16 for automated system monitoring and may trigger maintenance alerts or calibration procedures when sensor performance deviates from acceptable ranges.

[0184] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The flow sensor technology may be adapted for different fluid types, flow rate ranges, and measurement precision requirements while maintaining the fundamental principles of precise volumetric measurement and real-time monitoring capabilities.

[0185] Sensor Network for Environmental Monitoring

[0186] Referring to FIG. 2. FIG. 3, and FIG. 5, the microfluidic circuit may incorporate a water sensor 11 that provides fluid level monitoring capabilities within thesample chamber assembly 1 during testing operations. The water sensor 11 may be positioned to monitor the water level within the sample chamber assembly 1 and may provide real-time feedback to the microcontroller unit 16 to ensure proper fluid levels during sample immersion and testing procedures. In some cases, the water sensor 11 may operate using capacitive sensing principles that detect changes in electrical capacitance caused by the presence or absence of fluid within the sample chamber assembly 1.

[0187] The water sensor 11 may utilize capacitive sensing mechanisms that employ electrode pairs positioned within or adjacent to the sample chamber assembly 1 to detect fluid level variations. In some cases, capacitive sensing may be achieved through parallel plate electrodes, interdigitated electrode patterns, or coaxial electrode configurations that generate electrical fields within the sample chamber assembly 1. The capacitive approach may provide non-contact fluid level detection that does not require direct contact with test fluids, making the water sensor 11 suitable for biological samples and corrosive fluids that may damage contact-based sensing elements.

[0188] The water sensor 11 may incorporate optical sensing principles that utilize light transmission, reflection, or refraction properties to detect fluid presence within the sample chamber assembly 1. In some cases, optical sensing may be achieved through infrared light sources and photodetectors positioned on opposite sides of the sample chamber assembly 1, with fluid presence detected through changes in light transmission characteristics. The optical approach may provide rapid response times ranging from 1 millisecond to 10 milliseconds and may be less sensitive to fluid composition variations compared to capacitive or conductive sensing methods.

[0189] The water sensor 11 may employ ultrasonic sensing principles that utilize acoustic wave propagation to detect fluid levels within the sample chamber assembly 1. In some cases, ultrasonic sensing may be achieved through piezoelectric transducers that generate acoustic waves and measure the time-of-flight or reflection characteristics of acoustic signals traveling through air and fluid interfaces. The ultrasonic approach may provide accurate level measurement capabilities with resolution ranging from 0. 1 millimeters to 1 millimeter and may operate effectively with opaque fluids or containers where optical sensing may be limited.

[0190] The water sensor 11 may utilize conductive sensing principles that detect fluid presence through electrical conductivity measurements betw een electrode pairs positioned within the sample chamber assembly 1. In some cases, conductive sensing may be achieved through stainless steel electrodes, platinum electrodes, or carbon electrodes thatmake direct contact with test fluids and measure electrical resistance or conductance changes corresponding to fluid level variations. The conductive approach may provide simple and robust fluid detection capabilities but may be limited to electrically conductive fluids and may require electrode cleaning to prevent contamination buildup.

[0191] Referring to FIG. 19, FIG. 20, FIG. 21, FIG. 23, FIG. 24, and FIG. 25, the microfluidic circuit may incorporate a liquid level sensor 111 that provides comprehensive fluid level monitoring capabilities within various system components including waste containers, reservoirs, and sample chambers. The liquid level sensor 111 may be positioned to monitor fluid levels in multiple locations throughout the microfluidic circuit and may provide feedback signals to the microcontroller unit 16 for automated control of fluid handling operations. In some cases, the liquid level sensor 111 may operate using capacitive sensing principles similar to the water sensor 11 but may be configured for different fluid level ranges and container geometries.

[0192] The liquid level sensor 111 may incorporate capacitive sensing mechanisms that employ multiple electrode configurations to provide continuous level measurement capabilities across fluid level ranges from 0. 1 millimeters to 100 millimeters. In some cases, capacitive sensing may be achieved through segmented electrode arrays, continuous electrode strips, or helical electrode patterns that provide graduated capacitance changes corresponding to fluid level variations. The capacitive approach may enable the liquid level sensor 111 to provide analog output signals proportional to fluid level rather than discrete presence / absence detection.

[0193] The liquid level sensor 111 may utilize optical sensing principles that employ laser-based distance measurement, optical fiber sensing, or machine vision techniques to detect fluid levels with enhanced accuracy and resolution. In some cases, optical sensing may be achieved through laser triangulation methods that measure the distance to fluid surfaces using laser light sources and position-sensitive photodetectors. The optical approach may provide level measurement accuracy within ±0.05 millimeters and may enable detection of fluid surface characteristics including foam, bubbles, or surface contamination that could affect measurement accuracy.

[0194] The liquid level sensor 111 may employ ultrasonic sensing principles that utilize time-of-flight measurement techniques to determine fluid levels within containers of various sizes and geometries. In some cases, ultrasonic sensing may be achieved through ultrasonic transducers operating at frequencies ranging from 40 kHz to 200 kHz, with higher frequencies providing enhanced resolution for small-scale applications and lower frequenciesproviding enhanced penetration for larger containers. The ultrasonic approach may provide level measurement ranges from 1 millimeter to 1000 millimeters with resolution capabilities ranging from 0.01 millimeters to 0.1 millimeters.

[0195] The liquid level sensor 111 may incorporate conductive sensing principles that utilize multiple electrode pairs positioned at different heights within containers to provide discrete level detection at predetermined fluid levels. In some cases, conductive sensing may be achieved through electrode arrays with spacing ranging from 1 millimeter to 10 millimeters, enabling detection of fluid level changes with corresponding resolution. The conductive approach may provide simple and reliable level detection for applications where continuous level measurement may not be required and discrete level thresholds may be sufficient for automated control purposes.

[0196] The water sensor 11 and the liquid level sensor 111 may be constructed with materials selected for chemical compatibility with various test fluids including aqueous solutions, buffer systems, organic solvents, biological media, and cleaning solutions. In some cases, sensor materials may include polytetrafluoroethylene (PTFE), perfluoroalkoxy (PF A), polyvinylidene fluoride (PVDF), polyetheretherketone (PEEK), borosilicate glass, or medical-grade stainless steel including 316L stainless steel. The material selection may depend on the chemical resistance requirements, temperature ranges from -20°C to 80°C, and biocompatibility standards for the specific testing application.

[0197] The water sensor 11 and the liquid level sensor 111 may feature rapid response characteristics with detection times ranging from 1 millisecond to 100 milliseconds, enabling real-time monitoring of fluid level changes during rapid filling or draining operations. In some cases, rapid response may be achieved through high-frequency sampling rates, optimized signal processing algorithms, or enhanced sensor sensitivity that provides immediate detection of fluid level variations. The rapid response capability may enable precise timing control for automated fluid handling operations and may prevent overflow conditions or dry running of pump systems.

[0198] Referring to FIG. 20 and FIG. 21, the liquid level sensor 111 may be integrated with waste collection systems to monitor fluid accumulation and prevent overflow conditions during extended testing procedures. The liquid level sensor 111 may provide feedback signals to the microcontroller unit 16 that trigger automated waste disposal operations, pump shutdown procedures, or operator alerts when fluid levels approach predetermined thresholds. In some cases, the liquid level sensor 111 may enable automated waste management protocols that maintain optimal fluid levels throughout testing cycleswithout manual intervention.

[0199] The water sensor 11 and the liquid level sensor 111 may incorporate temperature compensation mechanisms that maintain measurement accuracy across temperature ranges from 10°C to 50°C. In some cases, temperature compensation may be achieved through integrated temperature sensors that monitor ambient temperature and apply temperature-dependent correction factors to level measurements. The temperature compensation capability may be particularly relevant for capacitive and ultrasonic sensing methods where sensor performance may be affected by temperature variations in the testing environment.

[0200] The water sensor 11 and the liquid level sensor 111 may feature calibration capabilities that enable adjustment of detection thresholds and measurement ranges for different fluid types and container configurations. In some cases, calibration may be performed using reference fluid levels, calibration fixtures, or automated calibration sequences that establish sensor response characteristics for specific testing applications. The calibration capability may enable the water sensor 11 and the liquid level sensor 111 to provide accurate measurements across different fluid densities, viscosities, and dielectric properties.

[0201] The water sensor 11 and the liquid level sensor 111 may incorporate signal filtering and processing algorithms that reduce measurement noise and enhance signal-to- noise ratios for improved detection reliability. In some cases, signal processing may include digital filtering techniques such as low-pass filtering, moving average filtering, or adaptive filtering that remove electrical noise while preserving level detection signal characteristics. The signal processing algorithms may be implemented in the microcontroller unit 16 or in dedicated signal processing hardware integrated with the water sensor 11 and the liquid level sensor 111.

[0202] The water sensor 11 and the liquid level sensor 111 may provide multiple output signal formats including analog voltage outputs, digital communication interfaces, and relay contact outputs for integration with different control system architectures. In some cases, analog outputs may provide voltage signals ranging from 0 volts to 10 volts or current signals ranging from 4 milliamperes to 20 milliamperes that are proportional to fluid levels. Digital communication interfaces may include I2C, SPI, UART, or Modbus protocols that enable integration with microcontroller-based control systems and provide enhanced diagnostic capabilities.

[0203] The water sensor 11 and the liquid level sensor 111 may incorporatediagnostic capabilities that monitor sensor performance and detect potential measurement errors or maintenance requirements. In some cases, diagnostic capabilities may include sensor response verification tests, signal quality assessments, or comparison with redundant measurement methods that confirm proper sensor operation. The diagnostic information may be provided to the microcontroller unit 16 for automated system monitoring and may trigger maintenance alerts or calibration procedures when sensor performance deviates from acceptable ranges.

[0204] The water sensor 11 and the liquid level sensor 111 may feature automated self-test capabilities that verify sensor functionality during system startup or scheduled maintenance intervals. In some cases, self-test procedures may include sensor excitation tests, response time measurements, or comparison with reference conditions that confirm proper sensor operation. The automated self-test capability may enhance system reliability and may provide early detection of sensor degradation or failure conditions that could affect measurement accuracy.

[0205] The water sensor 11 and the liquid level sensor 111 may be configured for coordinated operation that enables comprehensive fluid level monitoring throughout the microfluidic circuit. In some cases, coordinated operation may involve simultaneous monitoring of multiple fluid levels with centralized data processing and control logic that manages fluid handling operations based on multiple sensor inputs. The coordinated operation may be programmed into the microcontroller unit 16 and may include safety interlocks, overflow prevention protocols, and automated fluid management sequences that ensure proper system operation.

[0206] The water sensor 11 and the liquid level sensor 111 may incorporate redundant sensing capabilities that provide backup measurement methods for enhanced system reliability7. In some cases, redundant sensing may be achieved through multiple sensor technologies operating simultaneously, with comparison algorithms that detect sensor disagreements and provide fault-tolerant operation. The redundant sensing capability may enable continued system operation even when individual sensors experience failures or degradation, ensuring uninterrupted testing procedures and data collection.

[0207] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The sensor network design may be adapted for different fluid types, level measurement ranges, and integration requirements while maintaining the fundamental principles of accurate fluid level monitoring and automated control feedback.

[0208] Load Cell and Gravimetric Measurement System

[0209] Referring to FIG. 18, FIG. 20, and FIG. 21, the microfluidic circuit may incorporate a load cell 108 that provides precision gravimetric measurement capabilities for detecting minute mass changes during material characterization procedures. The load cell 108 may be positioned to measure weight variations of samples, fluids, or system components and may provide complementary measurement data that enhances the accuracy of volumetric measurements obtained through flow sensor technologies. In some cases, the load cell 108 may be configured with resolution capabilities greater than 1 nanogram, enabling detection of extremely small mass changes that correspond to early-stage swelling behaviors, molecular- scale material interactions, or subtle degradation processes that may not be detectable through volumetric measurement methods alone.

[0210] The load cell 108 may employ strain gauge sensing principles that utilize micro-fabricated strain-sensitive elements positioned on flexible diaphragms or cantilever structures to detect mechanical deformation caused by applied loads. In some cases, strain gauge sensing may be achieved through piezoresistive elements fabricated using semiconductor manufacturing techniques, with strain-sensitive resistors arranged in Wheatstone bridge configurations that provide enhanced sensitivity' and temperature compensation. The strain gauge approach may provide mass measurement resolution ranging from 1 nanogram to 100 nanograms, with precision applications requiring resolution capabilities from 0.1 nanograms to 10 nanograms for ultra-sensitive material characterization applications.

[0211] The load cell 108 may utilize piezoelectric sensing mechanisms that employ crystalline materials including quartz, lead zirconate titanate (PZT), or polyvinylidene fluoride (PVDF) to generate electrical signals proportional to applied mechanical forces. In some cases, piezoelectric sensing may7be achieved through resonant frequency7measurement techniques where applied loads cause changes in the resonant frequency of piezoelectric oscillators, with frequency shifts being proportional to mass changes. The piezoelectric approach may provide rapid response times ranging from 1 microsecond to 1 millisecond and may offer enhanced stability for long-term measurement applications.

[0212] The load cell 108 may incorporate capacitive sensing principles that utilize changes in electrical capacitance between electrode pairs to detect mechanical displacement caused by applied loads. In some cases, capacitive sensing may be achieved through parallel plate capacitors, differential capacitor configurations, or variable gap capacitors that providelinear response characteristics across measurement ranges from 1 nanogram to 1 milligram. The capacitive approach may provide enhanced resolution capabilities and may be less sensitive to temperature variations compared to strain gauge or piezoelectric sensing methods.

[0213] Referring to FIG. 18 and FIG. 21, the load cell 108 may be integrated with the sample chamber 104 to provide direct measurement of sample mass changes during swelling, absorption, or degradation processes. The load cell 108 may be positioned beneath the sample chamber 104 or may be incorporated into the sample chamber 104 structure to enable continuous monitoring of sample mass without requiring sample removal or handling procedures. In some cases, the load cell 108 may be configured to measure the combined mass of the sample chamber 104 and contained samples, with tare weight compensation algorithms applied to isolate sample mass changes from container mass contributions.

[0214] The load cell 108 may be constructed with materials selected for chemical resistance, thermal stability , and mechanical durability under various testing conditions. In some cases, load cell materials may include medical -grade stainless steel including 316L stainless steel, titanium alloys including Ti-6A1-4V. aluminum alloys including 6061-T6 aluminum, or specialized alloys including Inconel or Hastelloy for applications requiring enhanced corrosion resistance. The material selection may depend on the chemical compatibility requirements, temperature ranges from -40°C to 150°C, and mechanical stress levels encountered during testing procedures.

[0215] The load cell 108 may feature temperature compensation mechanisms that maintain measurement accuracy across temperature ranges from 10°C to 60°C. In some cases, temperature compensation may be achieved through integrated temperature sensors that monitor load cell temperature and apply temperature-dependent correction factors to mass measurements. The temperature compensation capability may be particularly relevant for strain gauge-based load cells where sensing element resistance may be affected by temperature variations in the testing environment.

[0216] Referring to FIG. 18, FIG. 20, and FIG. 21, the microfluidic circuit may incorporate a drying system 110 that provides controlled moisture removal capabilities for samples and system components during gravimetric measurement procedures. The drying system 110 may be positioned adjacent to the sample chamber 104 and the load cell 108 to enable coordinated drying and weighing operations that eliminate surface moisture effects and enhance measurement accuracy. In some cases, the drying system 110 may operate using multiple drying mechanisms including high-pressure air jets, fan-driven airflow, compressedair delivery, heated air circulation, vacuum-assisted drying, or absorbent material placement to achieve controlled moisture removal without affecting underlying sample structure.

[0217] The drying system 110 may utilize high-pressure air jets that direct focused air streams at sample surfaces to displace water droplets and remove surface moisture through mechanical action. In some cases, high-pressure air jets may operate at pressures ranging from 2 bar to 10 bar, with nozzle configurations that provide controlled air flow patterns and minimize sample disturbance. The high-pressure air approach may provide rapid drying capabilities with drying times ranging from 1 second to 30 seconds, enabling efficient moisture removal between measurement cycles without extending testing duration.

[0218] The drying system 110 may employ fan-driven airflow mechanisms that provide gentle surface evaporation through controlled air circulation around sample surfaces. In some cases, fan-driven airflow may be achieved through miniature centrifugal fans, axial fans, or blower systems that generate air velocities ranging from 1 meter per second to 10 meters per second. The fan-driven approach may provide consistent drying conditions with minimal sample disturbance and may be suitable for delicate samples that may be damaged by high-pressure air jets.

[0219] The drying system 110 may incorporate compressed air delivery systems that provide controlled air flow through precision nozzles, air knives, or distribution manifolds positioned around sample chambers. In some cases, compressed air delivery may utilize filtered and dried compressed air sources with dew points ranging from -40°C to -70°C to ensure moisture-free drying conditions. The compressed air approach may provide adjustable flow rates ranging from 1 liter per minute to 100 liters per minute and may incorporate flow control valves that enable precise adjustment of drying intensity.

[0220] The drying system 110 may utilize heated air circulation mechanisms that combine controlled temperature elevation with air flow to enhance evaporation rates and reduce drying times. In some cases, heated air circulation may be achieved through resistive heating elements, thermoelectric heaters, or infrared heating sources that elevate air temperatures ranging from 30°C to 80°C. The heated air approach may provide enhanced drying efficiency while maintaining sample temperatures within acceptable ranges that prevent thermal damage or structural changes in temperature-sensitive materials.

[0221] The drying system 110 may employ vacuum-assisted drying mechanisms that reduce ambient pressure around samples to enhance evaporation rates and remove moisture through sublimation or accelerated evaporation processes. In some cases, vacuum- assisted drying may be achieved through vacuum pumps, venturi systems, or vacuumchambers that reduce pressure levels ranging from 100 mbar to 1 mbar. The vacuum-assisted approach may provide gentle drying conditions that minimize mechanical stress on samples while achieving effective moisture removal.

[0222] The drying system 110 may incorporate absorbent material placement that utilizes hygroscopic materials, desiccants, or moisture-absorbing polymers positioned near sample surfaces to remove moisture through chemical or physical absorption processes. In some cases, absorbent materials may include silica gel, molecular sieves, calcium chloride, or superabsorbent polymers that provide controlled moisture removal without direct contact with samples. The absorbent material approach may provide passive drying capabilities that operate continuously without requiring active air flow or heating systems.

[0223] The drying system 110 may be configured for automated operation under control of the microcontroller unit 16 that coordinates drying sequences with gravimetric measurement cycles. In some cases, automated operation may involve timed drying sequences, moisture sensor feedback control, or load cell signal monitoring that determines optimal drying duration for different sample t pes and testing conditions. The automated control capability may ensure consistent drying conditions between measurement cycles and may prevent over-drying that could affect sample structure or under-drying that could compromise measurement accuracy.

[0224] The load cell 108 and the drying system 110 may be configured for coordinated operation that enables precise gravimetric measurement protocols with controlled moisture removal. In some cases, coordinated operation may involve sequential drying and weighing cycles where the dry ing system 110 removes surface moisture followed by immediate mass measurement using the load cell 108. The coordinated operation may be programmed into the microcontroller unit 16 and may include timing sequences, temperature monitoring, and safety interlocks that ensure proper operation and prevent sample damage.

[0225] The load cell 108 may provide mass measurement data that complements volumetric measurements obtained from the flow sensor 7 and the flow sensor 105, enabling cross-validation of measurement results and enhanced confidence in material characterization data. In some cases, gravimetric and volumetric measurements may be combined using data fusion algorithms that account for fluid density variations, temperature effects, and measurement uncertainties to provide comprehensive material property' assessments. The combined measurement approach may enable detection of material behaviors that may not be apparent from single measurement methods and may provide enhanced accuracy for complex material characterization applications.

[0226] The load cell 108 may incorporate signal conditioning electronics that amplify, filter, and digitize measurement signals to provide high-resolution mass data to the microcontroller unit 16. In some cases, signal conditioning may include instrumentation amplifiers, analog-to-digital converters with resolution ranging from 16 bits to 24 bits, and digital signal processing algorithms that enhance measurement precision and reduce noise interference. The signal conditioning capability may enable the load cell 108 to achieve measurement resolution greater than 1 nanogram while maintaining stability and repeatability across extended measurement periods.

[0227] The dry ing system 110 may incorporate environmental monitoring capabilities that measure humidity, temperature, and air flow conditions during drying operations to ensure consistent and controlled drying environments. In some cases, environmental monitoring may be achieved through integrated humidity sensors, temperature sensors, and air flow sensors that provide feedback signals to the microcontroller unit 16. The environmental monitoring capability may enable adaptive drying control that adjusts drying parameters based on ambient conditions and may provide documentation of drying conditions for quality assurance and regulatory compliance purposes.

[0228] The load cell 108 and the drying system 110 may be configured for operation across different sample types including hydrogels, polymers, biomaterials, and composite materials with varying moisture sensitivity and drying requirements. In some cases, operation parameters may be adjusted based on sample material properties, with different drying temperatures, air flow rates, and drying durations selected for different material types. The flexible operation capability may enable the load cell 108 and the drying system 110 to provide accurate measurements across diverse material characterization applications while maintaining sample integrity and measurement reliability.

[0229] The load cell 108 may feature calibration capabilities that enable adjustment of measurement sensitivity and accuracy using reference masses and calibration procedures. In some cases, calibration may be performed using certified reference weights ranging from 1 microgram to 1 gram, with multi-point calibration procedures that establish measurement linearity and accuracy across the full measurement range. The calibration capability may enable the load cell 108 to maintain measurement accuracy within ±0.01% of the measured value and may provide traceability to national measurement standards for regulatory compliance and qualify assurance purposes.

[0230] The drying system 110 may incorporate safety features that prevent overheating, over-pressurization, or excessive air flow that could damage samples or systemcomponents. In some cases, safety features may include temperature monitoring with automatic shutdown capabilities, pressure relief valves, flow limiting devices, and emergency stop controls that ensure safe operation under all conditions. The safety features may be integrated with the microcontroller unit 16 and may provide automated protection against equipment damage and sample loss during dry ing operations.

[0231] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The load cell 108 and the drying system 110 design may be adapted for different sample types, measurement ranges, and drying requirements while maintaining the fundamental principles of precise gravimetric measurement and controlled moisture removal for enhanced material characterization accuracy.

[0232] Reservoir and Waste Management Systems

[0233] Referring to FIG. 2. FIG. 3, and FIG. 5, the microfluidic circuit may incorporate a reservoir 13 that provides fluid storage and circulation capabilities for the automated testing system. The reservoir 13 may serve as the primary fluid source for testing operations and may be positioned to supply test fluids to the sample chamber assembly 1 through the pump systems and valve networks described previously. In some cases, the reservoir 13 may be configured with volumes ranging from 10 milliliters to 10 liters, depending on the testing requirements and the number of samples to be processed during extended testing procedures.

[0234] The reservoir 13 may be constructed from materials selected for chemical compatibility with various test fluids including aqueous solutions, buffer systems, organic solvents, biological media, and cleaning solutions. In some cases, reservoir materials may include borosilicate glass, medical-grade stainless steel including 316L stainless steel, polytetrafluoroethylene (PTFE), perfluoroalkoxy (PF A), polyvinylidene fluoride (PVDF), poly etheretherketone (PEEK), or high-density polyethylene (HDPE). The material selection may depend on the chemical resistance requirements, temperature ranges from -20°C to 100°C. and biocompatibility standards for the specific testing application.

[0235] Referring to FIG. 19, FIG. 20, FIG. 21, FIG. 23, FIG. 24, and FIG. 25, the microfluidic circuit may incorporate a reserv oir 100 that provides enhanced fluid storage capabilities and may be integrated with advanced control systems for automated testing protocols. The reservoir 100 may be positioned upstream of the 3V 101 and the multi-port valve 102 to supply test fluids to multiple sample chambers and measurement circuits. Insome cases, the reservoir 100 may be configured with larger volumes ranging from 100 milliliters to 50 liters to support high-throughput testing applications or extended testing procedures that require continuous fluid supply over periods ranging from hours to days.

[0236] The reservoir 100 may incorporate integrated temperature control features that maintain test fluid temperatures within predetermined ranges during testing operations. In some cases, temperature control may be achieved through resistive heating elements, thermoelectric coolers, or heat exchangers that provide heating and cooling capabilities ranging from 4°C to 80°C. The temperature control capability may be particularly relevant for biological samples, temperature-sensitive materials, or testing protocols that require specific thermal conditions to simulate physiological environments or accelerated aging conditions.

[0237] The reservoir 100 may include integrated pH control features that maintain test fluid acidity or alkalinity’ within specified ranges during testing procedures. In some cases, pH control may be achieved through automated dosing systems that add acid or base solutions to maintain pH levels ranging from 2.0 to 12.0, with precision applications requinng pH control within ±0.1 pH units. The pH control capability may be achieved through peristaltic pumps, solenoid-actuated dosing valves, or titration systems that respond to feedback signals from integrated pH sensors positioned within the reservoir 100.

[0238] The reservoir 13 and the reservoir 100 may feature fluid level monitoring capabilities that provide real-time feedback on fluid availability and consumption during testing operations. In some cases, fluid level monitoring may be achieved through the liquid level sensor 111 described previously, with sensing technologies including capacitive sensing, ultrasonic sensing, or optical sensing methods that provide level measurement accuracy within ±1 millimeter. The fluid level monitoring capability may enable automated refill operations, low-level alerts, or testing protocol modifications based on available fluid volumes.

[0239] The reservoir 13 and the reservoir 100 may incorporate mixing capabilities that ensure homogeneous fluid composition and prevent settling or stratification of test solutions during storage periods. In some cases, mixing may be achieved through magnetic stirring systems, impeller-based mixers, or recirculation pumps that provide gentle agitation without introducing air bubbles or foam formation. The mixing capability may be particularly relevant for suspensions, emulsions, or solutions containing particles that may settle during extended storage periods.

[0240] The reservoir 13 and the reservoir 100 may be configured with multiple inletand outlet ports that enable fluid filling, sampling, cleaning, and connection to the microfluidic circuit. In some cases, inlet ports may include fill ports with removable caps, quick-disconnect fittings, or automated filling connections that enable rapid fluid replacement between testing cycles. Outlet ports may include drain valves, sampling ports, or connection fittings that interface with the pump 9, the high-flow pump 14, the low-flow pump 15, or the pump 103 depending on the system configuration.

[0241] Referring to FIG. 19, FIG. 20, FIG. 21. FIG. 23, FIG. 24, and FIG. 25, the microfluidic circuit may incorporate a waste container 106 that provides collection and storage capabilities for fluids that have passed through the testing system. The waste container 106 may be positioned downstream of the sample chamber 104, the flow sensor 105, and other measurement components to collect fluids after testing operations are completed. In some cases, the waste container 106 may be configured with volumes ranging from 50 milliliters to 20 liters, depending on the testing throughput and the volume of fluids processed during testing procedures.

[0242] The waste container 106 may be constructed from materials selected for chemical compatibility with test fluids and waste products that may include sample residues, cleaning solutions, or degradation byproducts. In some cases, waste container materials may include high-density7polyethylene (HDPE), polypropylene (PP), polytetrafluoroethylene (PTFE), poly vinylidene fluoride (PVDF), or medical-grade stainless steel including 316L stainless steel. The material selection may depend on the chemical resistance requirements, disposal regulations, and safety considerations for the specific waste products generated during testing procedures.

[0243] The waste container 106 may be integrated with the liquid level sensor 111 to provide real-time monitoring of waste fluid accumulation and prevent overflow conditions during extended testing procedures. In some cases, the liquid level sensor 111 may provide feedback signals to the microcontroller unit 16 that trigger automated waste disposal operations, pump shutdown procedures, or operator alerts when fluid levels approach predetermined thresholds ranging from 80% to 95% of container capacity7. The level monitoring capability may enable automated waste management protocols that maintain optimal fluid levels throughout testing cycles without manual intervention.

[0244] Referring to FIG. 20 and FIG. 21, the w aste container 106 may be configured for automated drainage or disposal operations that remove accumulated w aste fluids without interrupting testing procedures. In some cases, automated drainage may be achieved through solenoid-actuated drain valves, peristaltic pumps, or gravity -fed drainagesystems that transfer waste fluids to external collection systems or disposal containers. The automated drainage capability may enable continuous operation during extended testing procedures and may prevent system shutdown due to waste container overflow conditions.

[0245] The waste container 106 may incorporate sampling capabilities that enable collection of waste fluid samples for analysis or documentation purposes. In some cases, sampling may be achieved through sampling ports, automated sampling systems, or removable sample containers that collect representative waste fluid samples during testing procedures. The sampling capability may be relevant for regulatory compliance, quality assurance, or research applications where waste fluid composition may provide additional information about sample behavior or testing conditions.

[0246] The reservoir 13, the reservoir 100. and the waste container 106 may be configured for coordinated operation that enables automated fluid management throughout the testing cycle. In some cases, coordinated operation may involve automated fluid transfer from the reservoir 13 or the reservoir 100 to the sample chamber assembly 1 or the sample chamber 104, followed by automated waste collection in the waste container 106 after testing operations are completed. The coordinated operation may be programmed into the microcontroller unit 16 and may include timing sequences, level monitoring, and safety interlocks that ensure proper fluid management and prevent system malfunctions.

[0247] The reservoir 13 and the reservoir 100 may incorporate cleaning and sterilization capabilities that enable automated cleaning between testing cycles or between different sample types. In some cases, cleaning capabilities may include automated rinse cycles using deionized water, detergent solutions, or sterilization solutions that remove residual samples and prevent cross-contamination. The cleaning capability may be achieved through dedicated cleaning fluid reservoirs, automated valve switching, or programmable cleaning sequences that ensure proper system hygiene and measurement accuracy.

[0248] The waste container 106 may feature modular construction that enables easy removal and replacement for waste disposal operations. In some cases, modular construction may include quick-disconnect fittings, removable container inserts, or disposable liner systems that facilitate rapid waste container replacement without requiring system shutdown or fluid pathway disconnection. The modular design may enable efficient waste management and may reduce downtime between testing cycles.

[0249] The reservoir 13, the reservoir 100. and the waste container 106 may incorporate safety features that prevent overpressurization, chemical exposure, or environmental contamination during normal operation and emergency conditions. In somecases, safety features may include pressure relief valves, secondary containment systems, vapor capture systems, or emergency shutdown capabilities that ensure safe operation under all conditions. The safety features may be integrated with the microcontroller unit 16 and may provide automated protection against equipment damage, personnel exposure, and environmental release of hazardous materials.

[0250] The reservoir 13 and the reservoir 100 may be configured with degassing capabilities that remove dissolved air or gases from test fluids to prevent bubble formation during testing procedures. In some cases, degassing may be achieved through vacuum degassing systems, membrane degassers, or ultrasonic degassing methods that reduce dissolved gas concentrations to levels below 1 part per million. The degassing capability may be particularly relevant for precision volumetric measurements where air bubbles could affect measurement accuracy or for biological samples where dissolved oxygen levels may affect sample behavior.

[0251] The waste container 106 may incorporate filtration capabilities that separate solid particles, sample residues, or other contaminants from waste fluids before disposal. In some cases, filtration may be achieved through mesh filters, membrane filters, or settling chambers that remove particles larger than 0.1 micrometers to 100 micrometers depending on the filtration requirements. The filtration capability may enable waste fluid recycling, reduce disposal costs, or meet environmental regulations for waste fluid discharge.

[0252] The reservoir 13, the reservoir 100. and the waste container 106 may be configured for operation across different environmental conditions including temperature ranges from 5°C to 50°C, humidity levels from 10% to 90% relative humidity, and atmospheric pressure variations from 0.8 atmospheres to 1.2 atmospheres. In some cases, environmental tolerance may be achieved through insulation systems, humidity control, or pressure compensation mechanisms that maintain proper operation under varying ambient conditions. The environmental tolerance capability may enable system operation in different laboratory environments, field conditions, or climate-controlled facilities without requiring specialized environmental controls.

[0253] The reservoir 13 and the reservoir 100 may incorporate documentation capabilities that record fluid usage, temperature history, pH variations, or other parameters relevant to testing procedures and regulatory compliance. In some cases, documentation may be achieved through integrated data logging systems, barcode readers, or RFID systems that track fluid batches, expiration dates, or quality control information. The documentation capability may provide traceability for regulatory compliance, quality assurance, or researchdocumentation requirements.

[0254] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The reservoir and waste management system design may be adapted for different fluid types, storage requirements, and waste disposal needs while maintaining the fundamental principles of automated fluid management and contamination prevention.

[0255] Control Systems and Processing Units

[0256] Referring to FIG. 2, FIG. 4, FIG. 21, and FIG. 25, the microfluidic circuit may incorporate comprehensive control systems that provide automated coordination of system components, real-time data processing, and reliable power management for extended testing operations. The control systems may comprise a microcontroller unit 16, a microcontroller 107, and a power supply 17, each configured to support different aspects of automated operation including sensor data acquisition, actuator control, communication interfaces, and electrical power distribution throughout the microfluidic circuit.

[0257] The microcontroller unit 16 may serve as the central processing component that orchestrates the operations of the various system elements including the pump 9, the high-flow pump 14, the low-flow pump 15, the flow sensor 7, the water sensor 11, and the solenoid valve systems described previously. In some cases, the microcontroller unit 16 may be implemented using commercial microcontroller platforms including STM32 microcontrollers, Arduino development boards, Raspberry Pi single-board computers, or other general-purpose microcontroller architectures that provide appropriate processing capabilities, memory resources, and input / output interfaces for the specific testing application requirements.

[0258] The microcontroller unit 16 may be based on STM32 microcontroller platforms that provide enhanced processing capabilities through ARM Cortex-M processor cores operating at clock frequencies ranging from 48 MHz to 480 MHz. In some cases, STM32 microcontrollers may incorporate floating-point processing units, digital signal processing capabilities, and hardware acceleration features that enable real-time processing of sensor data and complex control algorithms. The STM32 platform may provide memory resources including flash memory ranging from 64 kilobytes to 2 megabytes and random access memory ranging from 8 kilobytes to 1 megabyte, enabling storage of testing protocols, calibration data, and measurement results.

[0259] The microcontroller unit 16 may be implemented using Arduinodevelopment platforms that provide simplified programming interfaces and extensive library support for rapid system development and prototyping. In some cases, Arduino platforms may include Arduino Uno, Arduino Mega, Arduino Due, or Arduino MKR series boards that provide different processing capabilities, memory resources, and interface options. The Arduino platform may enable programming using simplified C++ syntax and may provide integrated development environments that facilitate rapid software development and testing protocol implementation.

[0260] The microcontroller unit 16 may be based on Raspberry Pi single-board computer platforms that provide enhanced processing capabilities through ARM-based system-on-chip processors operating at clock frequencies ranging from 700 MHz to 1.8 GHz. In some cases, Raspberry Pi platforms may incorporate multi-core processors, graphics processing units, and substantial memory resources including random access memory ranging from 512 megabytes to 8 gigabytes. The Raspberry Pi platform may enable implementation of complex data processing algorithms, machine learning capabilities, and advanced user interfaces that enhance system functionality and data analysis capabilities.

[0261] Referring to FIG. 21 and FIG. 25, a microcontroller 107 may be integrated into systems configured with the multi-port valve 102, the sample chamber 104, and associated measurement components. The microcontroller 107 may provide specialized control capabilities for complex testing protocols involving multiple sample chambers, coordinated valve operations, and sophisticated data acquisition sequences. In some cases, the microcontroller 107 may' be implemented using similar commercial platforms as the microcontroller unit 16 but may be configured with different software architectures and interface configurations to support specific system requirements.

[0262] The microcontroller 107 may be configured for coordinated operation with the microcontroller unit 16 in distributed control architectures that enable parallel processing of multiple testing protocols and enhanced system throughput. In some cases, distributed control may involve communication between the microcontroller 107 and the microcontroller unit 16 through serial communication interfaces, network connections, or shared memory’ systems that enable coordination of complex testing sequences involving multiple sample chambers and measurement circuits.

[0263] The microcontroller unit 16 and the microcontroller 107 may incorporate serial communication capabilities that enable data exchange with external systems, user interfaces, and data acquisition equipment. In some cases, serial communication may be achieved through Universal Asynchronous Receiver-Transmitter (UART) interfaces thatprovide point-to-point communication at baud rates ranging from 9600 bits per second to 921600 bits per second. The UART communication capability may enable connection to personal computers, data logging systems, or remote monitoring equipment that provide enhanced data analysis and system control capabilities.

[0264] The microcontroller unit 16 and the microcontroller 107 may utilize Inter- Integrated Circuit (I2C) communication interfaces that enable connection to multiple sensor devices, actuator controllers, and peripheral components through shared communication buses. In some cases, I2C communication may operate at clock frequencies ranging from 100 kHz to 3.4 MHz and may support connection of up to 127 devices on a single communication bus. The I2C interface may enable simplified wiring architectures and may provide standardized communication protocols for integration with commercial sensor and actuator components.

[0265] The microcontroller unit 16 and the microcontroller 107 may incorporate Serial Peripheral Interface (SPI) communication capabilities that provide high-speed data transfer with sensor devices, memory components, and specialized interface circuits. In some cases, SPI communication may operate at clock frequencies ranging from 1 MHz to 50 MHz and may provide full-duplex communication capabilities that enable simultaneous data transmission and reception. The SPI interface may be particularly suitable for high-resolution anal og-to-digi tai converters, precision sensor interfaces, and real-time data acquisition applications that require enhanced data transfer rates.

[0266] The microcontroller unit 1 and the microcontroller 107 may feature wireless communication capabilities including Wi-Fi connectivity that enables remote monitoring, data transmission, and system control through network connections. In some cases, Wi-Fi communication may be achieved through integrated wireless modules or external wireless adapters that provide IEEE 802. 11 compatibility and support data transmission rates ranging from 1 Mbps to 150 Mbps. The Wi-Fi capability may enable remote access to testing data, automated data backup to cloud storage systems, and integration with laboratory information management systems.

[0267] The microcontroller unit 16 and the microcontroller 107 may incorporate Bluetooth Low Energy (BLE) communication capabilities that provide wireless connectivity with mobile devices, tablet computers, and specialized monitoring equipment. In some cases, BLE communication may operate at frequencies around 2.4 GHz and may provide communication ranges from 1 meter to 100 meters depending on the antenna configuration and environmental conditions. The BLE capability may enable wireless sensor monitoring.mobile device interfaces, and battery -powered remote monitoring applications that require low power consumption.

[0268] Referring to FIG. 2 and FIG. 4, a power supply 17 may provide electrical energy to operate the microcontroller unit 16, the pump systems, the sensor networks, and other electronic components within the microfluidic circuit. The power supply 17 may be configured to deliver multiple voltage levels including 5 volts DC, 12 volts DC, and 24 volts DC to accommodate different component requirements and may provide cunent capabilities ranging from 100 milliamperes to 10 amperes depending on the system configuration and power consumption requirements.

[0269] The power supply 17 may be implemented using switched-mode power supply technologies that provide enhanced efficiency, reduced heat generation, and compact form factors compared to linear power supply designs. In some cases, switched-mode power supplies may achieve efficiency levels ranging from 80% to 95% and may incorporate power factor correction, voltage regulation, and overcurrent protection features that ensure reliable operation under varying load conditions. The switched-mode approach may enable the power supply 17 to operate from universal input voltage ranges including 85 volts AC to 264 volts AC at frequencies from 47 Hz to 63 Hz.

[0270] The power supply 17 may incorporate battery7backup capabilities that provide uninterrupted operation during power outages or enable portable operation in field testing applications. In some cases, battery7backup may be achieved through rechargeable lithium-ion batteries, sealed lead-acid batteries, or nickel -metal hydride batteries that provide operating times ranging from 1 hour to 24 hours depending on the battery capacity and system power consumption. The battery backup capability7may include automatic switching between AC power and battery7power, battery charging circuits, and low-battery warning systems that ensure continuous operation and data protection.

[0271] The power supply 17 may feature multiple isolated output channels that provide electrical isolation between different system components and reduce the risk of ground loops, noise coupling, or electrical interference between sensitive measurement circuits. In some cases, electrical isolation may be achieved through transformer-based isolation, optocoupler isolation, or capacitive isolation techniques that provide isolation voltages ranging from 1000 volts to 4000 volts. The isolation capability7may be particularly relevant for precision measurement applications where electrical noise could affect sensor accuracy or for safety applications where electrical isolation may be required for operator protection.

[0272] The microcontroller unit 16, the microcontroller 107, and the power supply 17 may be configured for coordinated operation that enables automated power management, system startup sequences, and controlled shutdown procedures. In some cases, coordinated operation may involve power sequencing that activates system components in predetermined orders to prevent inrush current conditions, voltage transients, or component damage during startup operations. The coordinated power management may include soft-start capabilities, voltage monitoring, and fault detection systems that ensure reliable system operation and component protection.

[0273] The microcontroller unit 16 and the microcontroller 107 may incorporate real-time operating system capabilities that enable multitasking operation, priority-based task scheduling, and deterministic response times for time-critical control operations. In some cases, real-time operating systems may include FreeRTOS, RT-Thread, or commercial realtime kernels that provide task management, inter-task communication, and timing services. The real-time capability7may enable simultaneous execution of multiple control loops, data acquisition tasks, and communication protocols without compromising system responsiveness or measurement accuracy.

[0274] The microcontroller unit 16 and the microcontroller 107 may feature data logging capabilities that record testing parameters, sensor measurements, system events, and diagnostic information for quality assurance and regulatory compliance purposes. In some cases, data logging may be achieved through internal memory7storage, external memory devices, or network -based data storage systems that provide data retention capabilities ranging from days to years. The data logging capability may include timestamp information, data compression, and data integrity verification features that ensure accurate documentation of testing procedures and results.

[0275] The microcontroller unit 16 and the microcontroller 107 may incorporate user interface capabilities that enable operator interaction through display screens, keypad inputs, touchscreen interfaces, or web-based control panels. In some cases, user interfaces may provide graphical displays of system status, testing progress, measurement results, and diagnostic information that enhance operator awareness and system control capabilities. The user interface may include password protection, user access levels, and audit trail features that ensure secure operation and regulatory compliance.

[0276] The power supply 17 may include power monitoring capabilities that measure voltage levels, current consumption, power factor, and energy usage throughout the microfluidic circuit. In some cases, power monitoring may provide feedback signals to themicrocontroller unit 16 and the microcontroller 107 that enable adaptive power management, fault detection, and energy optimization algorithms. The power monitoring capability’ may include data logging of power consumption patterns, efficiency measurements, and predictive maintenance indicators that enhance system rel i abi 1 i ty and operational efficiency.

[0277] The microcontroller unit 16, the microcontroller 107, and the power supply 17 may be configured for operation across different environmental conditions including temperature ranges from 0°C to 70°C. humidity levels from 10% to 90% relative humidity, and electromagnetic interference conditions that may be encountered in laboratory environments. In some cases, environmental tolerance may be achieved through conformal coating, sealed enclosures, electromagnetic shielding, or temperature compensation algorithms that maintain proper operation under varying ambient conditions.

[0278] The microcontroller unit 16 and the microcontroller 107 may incorporate diagnostic capabilities that monitor system performance, detect component failures, and provide predictive maintenance indicators that enhance system reliability and reduce downtime. In some cases, diagnostic capabilities may include self-test routines, component health monitoring, communication verification tests, and performance benchmarking that confirm proper system operation. The diagnostic information may be provided through user interfaces, communication networks, or automated alert systems that enable proactive maintenance and system optimization.

[0279] The microcontroller unit 16, the microcontroller 107, and the power supply 17 may feature modular construction that enables easy replacement, upgrade, or reconfiguration of individual components without requiring replacement of the entire control system. In some cases, modular construction may include standardized mounting interfaces, plug-and-play electrical connections, and software compatibility features that facilitate rapid system modification or expansion. The modular design may enable system customization for different testing requirements and future expansion of control capabilities.

[0280] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The control system design may be adapted for different processing requirements, communication interfaces, and power specifications while maintaining the fundamental principles of automated system coordination and reliable operation.

[0281] Environmental Control Components

[0282] Referring to FIG. 20 and FIG. 21, the microfluidic circuit may incorporateenvironmental control components that provide precise temperature regulation and specialized fluid management capabilities to enhance testing accuracy and enable controlled environmental conditions during material characterization procedures. The environmental control components may comprise a heating element 112 and a single port 109, each configured to support specific aspects of temperature control and fluid handling that may be particularly relevant for biological samples, temperature-sensitive materials, or testing protocols that require controlled thermal environments.

[0283] The heating element 112 may be positioned adjacent to the sample chamber 104 to provide controlled temperature regulation during testing operations. In some cases, the heating element 112 may be configured to maintain sample temperatures within predetermined ranges that simulate physiological conditions, accelerate material reactions, or provide controlled thermal stress conditions for material characterization applications. The heating element 112 may operate across temperature ranges from ambient temperature to 80°C, with precision applications requiring temperature control within ±0.1°C to ±1.0°C depending on the testing requirements and sample sensitivity.

[0284] The heating element 112 may comprise a thermoelectric heater that utilizes Peltier element technology to provide both heating and cooling capabilities through electrical current control. In some cases, the thermoelectric heater may be implemented using bismuth telluride (Bi2Te3) Peltier elements that provide heating and cooling capabilities through the thermoelectric effect, where electrical current flow through the Peltier element creates temperature differences between the hot and cold sides of the device. The Peltier element approach may enable precise temperature control with response times ranging from 10 seconds to 300 seconds and may provide temperature stability within ±0.05°C to ±0.5°C depending on the thermal load and control system configuration.

[0285] The heating element 112 may be coupled with thermistors that provide temperature feedback for closed-loop temperature control. In some cases, thermistors may be implemented using negative temperature coefficient (NTC) or positive temperature coefficient (PTC) thermistors with resistance values ranging from 1 kilohm to 100 kilohms at 25°C. The thermistor approach may provide temperature measurement accuracy within ±0. 1°C to ±0.5 °C and may enable rapid temperature sensing with response times ranging from 1 second to 10 seconds. The thermistor feedback may be processed by the microcontroller 107 to provide automated temperature regulation that maintains target temperatures despite variations in ambient conditions or thermal loads.

[0286] The heating element 112 may be coupled with resistance temperaturedetectors (RTDs) that provide enhanced temperature measurement accuracy and stability for precision temperature control applications. In some cases. RTDs may be implemented using platinum resistance elements with resistance values of 100 ohms, 500 ohms, or 1000 ohms at 0°C, providing temperature coefficients of approximately 0.385 ohms per ohm per degree Celsius. The RTD approach may provide temperature measurement accuracy within ±0.01 °C to ±0.1 °C and may offer enhanced long-term stability compared to thermistor-based sensing methods. The RTD feedback may enable precision temperature control for applications requiring right temperature tolerances or extended temperature monitoring periods.

[0287] The heating element 112 may be coupled with thermocouples that provide temperature measurement capabilities across wide temperature ranges and may offer rapid response characteristics for dynamic temperature control applications. In some cases, thermocouples may be implemented using Type K (chromel-alumel), Type J (iron- constantan), or Type T (copper-constantan) thermocouple configurations that provide temperature measurement ranges from -200°C to 1200°C depending on the thermocouple type. The thermocouple approach may provide temperature measurement accuracy within ±0.5°C to ±2.0°C and may offer response times ranging from 0. 1 seconds to 5 seconds for rapid temperature monitoring applications.

[0288] The heating element 112 may incorporate resistive heating elements that provide controlled thermal energy through electrical resistance heating. In some cases, resistive heating may be achieved through thin-film heaters, wire-wound heaters, or ceramic heaters that convert electrical energy to thermal energy with efficiency levels ranging from 90% to 99%. The resistive heating approach may provide heating power levels ranging from 1 watt to 100 watts and may be controlled through pulse-width modulation (PWM), proportional-integral-derivative (PID) control algorithms, or variable voltage control methods that maintain target temperatures with enhanced precision.

[0289] The heating element 112 may feature thermal insulation systems that minimize heat loss to surrounding components and enhance temperature control efficiency. In some cases, thermal insulation may be achieved through aerogel insulation, foam insulation, or vacuum insulation systems that provide thermal resistance values ranging from 0.1 K m2 / W to 10 K mW. The thermal insulation capability may reduce power consumption, improve temperature stabili ty, and prevent thermal interference with adjacent system components including sensors, electronics, or other temperature-sensitive elements.

[0290] Referring to FIG. 21, a single port 109 may be integrated with the sample chamber 104 to provide specialized fluid management capabilities that enable controlled fluidintroduction, sampling, or venting operations during testing procedures. The single port 109 may be positioned to provide access to the sample chamber 104 for specific fluid handling operations that may not be accommodated through the standard inlet and outlet connections described previously. In some cases, the single port 109 may be configured with standardized fittings including luer-lock connections, threaded ports, or quick-disconnect fittings that enable rapid connection and disconnection of specialized fluid handling equipment.

[0291] The single port 109 may provide sampling capabilities that enable collection of fluid samples from the sample chamber 104 during testing operations without interrupting the primary testing protocol. In some cases, sampling may be achieved through syringe sampling, automated sampling systems, or micro-sampling devices that extract small fluid volumes ranging from 1 microliter to 1000 microliters for analysis or documentation purposes. The sampling capability may be relevant for monitoring fluid composition changes, pH variations, or contamination levels during extended testing procedures.

[0292] The single port 109 may enable controlled venting operations that release excess pressure or trapped air from the sample chamber 104 during filling or temperature control operations. In some cases, venting may be achieved through manual venting valves, automated pressure relief systems, or controlled gas exchange mechanisms that maintain optimal pressure conditions within the sample chamber 104. The venting capability may prevent pressure buildup that could affect sample behavior, measurement accuracy, or system component integrity during testing procedures.

[0293] The single port 109 may provide access for specialized fluid introduction including calibration fluids, cleaning solutions, or treatment reagents that may be required for specific testing protocols. In some cases, specialized fluid introduction may be achieved through precision dosing systems, automated injection systems, or manual injection methods that deliver controlled volumes of specialized fluids to the sample chamber 104. The specialized fluid capability' may enable complex testing protocols involving multiple fluid types, sequential treatments, or calibration procedures that enhance measurement accuracy and testing versatility.

[0294] The single port 109 may be constructed with materials selected for chemical compatibility’ with various fluids including aggressive solvents, biological media, or cleaning solutions that may be introduced through the port during testing operations. In some cases, port materials may include polytetrafluoroethylene (PTFE), perfluoroalkoxy (PF A), polyvinylidene fluoride (PVDF), polyetheretherketone (PEEK), or medical-grade stainless steel including 316L stainless steel. The material selection may depend on the chemicalresistance requirements, temperature compatibility', and biocompatibility standards for the specific testing application.

[0295] The heating element 112 and the single port 109 may be configured for coordinated operation that enables temperature-controlled fluid handling operations and enhanced testing capabilities. In some cases, coordinated operation may involve temperature regulation during fluid sampling, heated fluid introduction, or temperature-controlled venting operations that maintain optimal conditions for temperature-sensitive samples or testing protocols. The coordinated operation may be programmed into the microcontroller 107 and may include timing sequences, temperature monitoring, and safety interlocks that ensure proper operation and prevent sample damage.

[0296] The heating element 112 may incorporate safety features that prevent overheating, thermal runaway, or component damage during temperature control operations. In some cases, safety' features may include temperature limit switches, thermal fuses, or software-based temperature monitoring that automatically shut down heating operations when temperatures exceed predetermined safety thresholds ranging from 85°C to 150°C. The safety features may be integrated with the microcontroller 107 and may provide automated protection against equipment damage and sample loss during heating operations.

[0297] The single port 109 may feature sealing mechanisms that prevent fluid leakage and maintain system integrity when the port may not be in active use. In some cases, sealing may be achieved through removable caps, self-sealing septums, or automated valve systems that provide leak-tight closure when specialized fluid handling operations may not be required. The sealing capability may prevent contamination, evaporation, or pressure loss that could affect testing accuracy or system performance.

[0298] The heating element 112 may be configured for operation across different heating modes including constant temperature mode, temperature ramping mode, or cyclic temperature mode that enable various testing protocols and material characterization procedures. In some cases, constant temperature mode may maintain fixed temperatures for equilibrium measurements, temperature ramping mode may provide controlled temperature changes for thermal analysis, and cyclic temperature mode may provide repeated temperature variations for fatigue testing or accelerated aging studies. The multiple heating modes may be programmed into the microcontroller 107 and may provide enhanced testing versatility for different material types and research applications.

[0299] The single port 109 may incorporate flow control capabilities that regulate fluid flow rates during sampling or injection operations to prevent sample disturbance ormeasurement interference. In some cases, flow control may be achieved through integrated flow restrictors, adjustable orifices, or electronically controlled valves that provide flow rates ranging from 1 microliter per minute to 1000 microliters per minute. The flow control capability may enable gentle fluid handling that presen es sample integrity and maintains measurement accuracy during specialized fluid operations.

[0300] The heating element 112 and the single port 109 may be configured for modular integration that enables easy installation, replacement, or upgrade without requinng modification of the primary system components. In some cases, modular integration may include standardized mounting interfaces, plug-and-play electrical connections, and compatible fluid connections that facilitate rapid system reconfiguration or component replacement. The modular design may enable system customization for different testing requirements and future expansion of environmental control capabilities.

[0301] The heating element 112 may incorporate energy efficiency features that minimize power consumption while maintaining temperature control performance. In some cases, energy efficiency may be achieved through optimized thermal design, advanced control algorithms, or thermal energy recovery systems that reduce overall power requirements. The energy efficiency capability may enable extended operation on battery power, reduce operating costs, and minimize heat generation that could affect adj acent system components or measurement accuracy.

[0302] The single port 109 may feature diagnostic capabilities that monitor port condition, sealing integrity, or fluid flow characteristics to ensure proper operation and detect potential maintenance requirements. In some cases, diagnostic capabilities may include pressure monitoring, flow verification, or leak detection systems that confirm proper port operation and provide feedback to the microcontroller 107. The diagnostic information may enable predictive maintenance, automated system monitoring, and early detection of component degradation that could affect testing performance.

[0303] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The environmental control component design may be adapted for different temperature ranges, fluid types, and testing requirements while maintaining the fundamental principles of precise environmental control and specialized fluid management for enhanced material characterization capabilities.

[0304] Sample Integration and Testing Protocols

[0305] Referring to FIG. 17, FIG. 18, FIG. 20, and FIG. 22, the microfluidic circuit may incorporate comprehensive sample integration and automated testing protocols that enable systematic characterization of material properties through coordinated operation of system components. The testing protocols may be designed to accommodate a sample 120 that represents the soft-tissue material, hydrogel, polymer, or biomaterial to be characterized during testing procedures. The sample 120 may be integrated into the sample chamber 104 or the sample chamber assembly 1 depending on the system configuration and may undergo controlled exposure to test fluids through automated sequences that provide precise measurement of swelling characteristics, liquid absorbance properties, and volumetric changes over time.

[0306] The sample 120 may comprise various material types including natural hydrogels such as agarose, alginate, chitosan, gellan gum, or collagen-based materials that exhibit swelling behaviors when exposed to aqueous solutions. In some cases, the sample 120 may include synthetic hydrogels such as polyacrylamide, polyethylene glycol (PEG) hydrogels, poly(vinyl alcohol) (PVA) hydrogels, or poly(N-isopropylacrylamide) (PNIPAM) hydrogels that provide controlled swelling responses under specific temperature or pH conditions. The sample 120 may also comprise composite materials including interpenetrating polymer networks, nanocomposite hydrogels, or hybrid organic-inorganic materials that combine multiple material properties for specialized applications.

[0307] The sample 120 may be configured with dimensions ranging from 0. 1 millimeters to 50 millimeters in diameter or length, depending on the sample chamber 104 capacity7and testing requirements. In some cases, the sample 120 may have volumes ranging from 1 nanoliter to 10 milliliters, with precision applications requiring sample volumes from 10 nanoliters to 1 milliliter for enhanced measurement sensitivity. The sample 120 may be prepared in various geometric configurations including spherical beads, cylindrical rods, flat discs, or irregular shapes that may be representative of the intended application or manufacturing process.

[0308] Referring to FIG. 17, the automated testing protocol may begin with placement of the sample 120 into the sample chamber 104, followed by positioning of the sample chamber 104 into the microfluidic device. The initial sample integration may involve securing the sample 120 within the sample chamber 104 using filter elements, mechanical restraints, or positioning fixtures that prevent sample displacement during fluid handling operations. In some cases, sample integration may include verification of sample positioning through optical inspection, weight measurement, or dimensional verification to ensure propersample placement before testing procedures commence.

[0309] The automated testing protocol may proceed with filling the sample chamber 104 with test fluid through controlled operation of the pump 103 and associated valve systems. In some cases, the filling operation may involve opening of inlet valves, activation of the pump 103 at predetermined flow rates ranging from 100 microliters per minute to 10 milliliters per minute, and monitoring of fluid levels through the liquid level sensor 111 to ensure complete sample immersion. The filling phase may be completed when the liquid level sensor 111 indicates that the sample chamber 104 has reached the predetermined fluid level, typically corresponding to complete submersion of the sample 120 with additional fluid volume to accommodate swelling expansion.

[0310] Following the filling operation, the automated testing protocol may include priming of the flow sensor 105 to establish baseline flow measurement conditions and remove air bubbles from the measurement circuit. In some cases, priming may involve circulation of test fluid through the flow sensor 105 at controlled flow' rates, monitoring of flow sensor 105 output signals to verily stable operation, and calibration verification using known flow rates or reference conditions. The priming phase may ensure that subsequent volumetric measurements provide accurate data without interference from air bubbles, flow irregularities, or sensor drift effects.

[0311] The automated testing protocol may continue with emptying of the sample chamber 104 while simultaneously measuring the volume of displaced fluid using the flowsensor 105. In some cases, the emptying operation may involve opening of outlet valves, activation of drainage pumps, and real-time monitoring of fluid flow rates as the sample chamber 104 is drained. The flow sensor 105 may provide continuous measurement of fluid volume as the sample chamber 104 is emptied, with the total measured volume corresponding to the available fluid volume within the sample chamber 104 after accounting for the volume occupied by the sample 120.

[0312] The automated testing protocol may calculate the initial volume of the sample 120 by subtracting the measured fluid volume at time zero from the known total volume of the sample chamber 104. In some cases, the calculation may account for temperature effects, fluid density variations, and measurement uncertainties to provide accurate determination of initial sample volume. The initial volume measurement may serve as the baseline reference for subsequent swelling measurements and may be stored in the microcontroller 107 for comparison with later measurements during the testing cycle.

[0313] The automated testing protocol may include a waiting period ofpredetermined duration to allow the sample 120 to undergo swelling, absorption, or other time-dependent changes while immersed in the test fluid. In some cases, the waiting period may range from 1 minute to 24 hours, depending on the material properties, testing objectives, and expected swelling kinetics. During the waiting period, the sample chamber 104 may remain filled with test fluid, and environmental conditions such as temperature may be controlled through the heating element 112 to maintain consistent testing conditions.

[0314] The automated testing protocol may repeat the priming and emptying operations at predetermined time intervals to monitor the progression of sample swelling or volume changes over time. In some cases, the repetition cycle may occur at intervals ranging from 30 seconds to 4 hours, with more frequent measurements during periods of rapid swelling and less frequent measurements during equilibrium phases. Each measurement cycle may provide data on the volume of fluid displaced by the sample 120, enabling calculation of volumetric changes that correspond to material swelling characteristics.

[0315] At each measurement repetition, the automated testing protocol may calculate the volume change of the sample 120 by comparing the current fluid displacement measurement with the previous measurement. In some cases, the volume change calculation may account for fluid evaporation, temperature effects, and measurement drift to provide accurate determination of actual sample volume changes. The calculated volume changes may be plotted against time to generate swelling kinetics data that characterizes the temporal behavior of the sample 120 under the specified testing conditions.

[0316] Referring to FIG. 18, the microfluidic circuit may incorporate gravimetric measurement protocols that complement the volumetric measurement approach through integration of the load cell 108 and the drying system 110. The gravimetric protocol may begin with placement of the sample 120 into the sample chamber 104, followed by filling of the sample chamber 104 with test fluid using procedures similar to those described for volumetric measurement protocols. The gravimetric approach may provide enhanced measurement accuracy through direct mass measurement of displaced fluids rather than relying solely on flow sensor 105 measurements.

[0317] The gravimetric testing protocol may include emptying of the sample chamber 104 while simultaneously operating the drying system 1 10 to remove surface moisture from the sample chamber 104 and associated components. In some cases, the dry ing operation may involve activation of high-pressure air jets, heated air circulation, or vacuum- assisted drying mechanisms that remove residual moisture without affecting the sample 120 structure. The drying phase may be controlled through timing sequences, temperaturemonitoring, or moisture sensor feedback to ensure complete moisture removal while preventing sample damage.

[0318] Following the drying operation, the gravimetric testing protocol may measure the mass of emptied fluid using the load cell 108 positioned to detect weight changes of collected fluids. In some cases, the load cell 108 may provide mass measurements with resolution greater than 1 nanogram, enabling detection of minute fluid mass changes that correspond to small volumetric variations in the sample 120. The mass measurement may be converted to volume through application of fluid density data, with density values determined through temperature measurement, fluid composition analysis, or reference calibration procedures.

[0319] The gravimetric testing protocol may calculate the initial volume of the sample 120 using the same approach as the volumetric protocol, with mass-to-volume conversion providing the fluid volume data for calculation purposes. In some cases, the gravimetric approach may provide enhanced accuracy compared to flow sensor 105 measurements, particularly for applications involving small sample volumes, low flow rates, or fluids with varying density properties. The gravimetric measurement may serve as a reference standard for calibration of flow sensor 105 measurements or may be used as the primary measurement method for precision applications.

[0320] The gravimetric testing protocol may include a loop repeater mechanism that enables automated repetition of the measurement cycle for a predetermined number of iterations specified by the operator or testing protocol. In some cases, the loop repeater may execute measurement cycles ranging from 2 iterations to 1000 iterations, with each cycle providing data points for construction of swelling kinetics curves. The loop repeater may be controlled through the microcontroller 107 and may include timing controls, environmental monitoring, and safety interlocks that ensure consistent testing conditions throughout the measurement sequence.

[0321] Following completion of the measurement cycles, the gravimetric testing protocol may transfer collected fluids from the load cell 108 to the waste container 106 through automated drainage systems or manual transfer procedures. In some cases, fluid transfer may involve activation of drainage valves, pump systems, or gravity -fed transfer mechanisms that move fluids to appropriate collection or disposal systems. The fluid transfer operation may include documentation of fluid volumes, composition data, or disposal tracking information for regulatory compliance or quality assurance purposes.

[0322] The gravimetric testing protocol may conclude with display or recording ofvolume change data over time, providing comprehensive documentation of sample swelling characteristics and testing conditions. In some cases, data presentation may include graphical displays, numerical tables, statistical analysis, or export capabilities that enable further data processing or integration with laboratory information management systems. The data recording may include timestamp information, environmental conditions, calibration data, and measurement uncertainties that provide complete documentation of testing procedures and results.

[0323] Referring to FIG. 6, the microfluidic circuit may incorporate dual-pump testing protocols that utilize both the high-flow pump 14 and the low-flow pump 15 to optimize testing efficiency and measurement accuracy through coordinated pump operation. The dual-pump protocol may begin with loading of the sample 120 into the sample chamber assembly 1 and initiation of automated testing sequences that take advantage of different pump capabilities for different phases of the testing cycle. The dual-pump approach may enable rapid sample chamber filling through the high-flow pump 14 followed by precise measurement operations through the low-flow pump 15.

[0324] The dual-pump testing protocol may include a rapid filling phase where the inlet solenoid 3 and the bleeder solenoid 5 are opened to enable fluid flow into the sample chamber assembly 1 and air escape from the flow chamber assembly 4. In some cases, the high-flow pump 14 may be activated to provide flow rates ranging from 1 milliliter per minute to 50 milliliters per minute, enabling rapid filling of the sample chamber assembly 1 while minimizing testing time. The water sensor 11 may monitor fluid levels during the filling phase and provide feedback signals to the microcontroller unit 16 when the sample chamber assembly 1 reaches the predetermined fill level.

[0325] Upon completion of the filling phase, the dual-pump testing protocol may transition to a drying phase where the inlet solenoid 3 is closed and the outlet solenoid 2 is opened to enable controlled drainage of the sample chamber assembly 1. In some cases, the drying phase may include introduction of high-pressure air through the three-way valve 12 to remove surface moisture from the sample 120 and prepare for accurate measurement operations. The drying phase may be controlled through timing sequences ranging from 5 seconds to 300 seconds, depending on the sample size, moisture content, and drying system capabilities.

[0326] Following the drying phase, the dual-pump testing protocol may close both the outlet solenoid 2 and the three-way valve 12 to prepare for the measurement phase. The measurement phase may involve switching of the three-way valve 8 and the three-way valve10 to direct fluid flow through the measurement circuit, opening of the outlet solenoid 6 and the bleeder solenoid 5. and activation of the low-flow pump 15 to provide controlled fluid flow suitable for precision measurement operations. In some cases, the low-flow pump 15 may operate at flow rates ranging from 1 microliter per minute to 500 microliters per minute to enable accurate volumetric measurement through the flow sensor 7.

[0327] During the measurement phase, the dual-pump testing protocol may utilize the flow sensor 7 to measure fluid flow rates while the microcontroller unit 16 processes and logs measurement data in real-time. In some cases, the measurement phase may continue for predetermined durations ranging from 30 seconds to 30 minutes, depending on the sample chamber assembly 1 volume and the selected flow rates. Following each measurement cycle, the low-flow pump 15 may be stopped and the solenoids may be closed to prepare for the next measurement iteration.

[0328] The dual-pump testing protocol may repeat the measurement loop multiple times to monitor dynamic swelling behavior of the sample 120 over extended time periods. In some cases, the measurement loop may be repeated at intervals ranging from 5 minutes to 4 hours, with the total testing duration extending from 1 hour to 7 days depending on the material properties and testing objectives. The dual -pump configuration may enable efficient transition between rapid filling operations and precise measurement operations, enhancing both testing speed and measurement accuracy compared to single-pump configurations.

[0329] Referring to FIG. 7. the microfluidic circuit may incorporate single-pump testing protocols that utilize the pump 9 to provide both filling and measurement capabilities through variable flow rate control and coordinated valve operation. The single-pump protocol may begin with placement of the sample 120 into the sample chamber assembly 1 and initiation of automated testing sequences that optimize pump operation for different phases of the testing cycle. The single-pump approach may provide simplified hardware requirements while maintaining measurement accuracy through careful control of flow rates and timing sequences.

[0330] The single-pump testing protocol may include opening of the inlet solenoid 3 and the bleeder solenoid 5 to enable the pump 9 to begin filling the sample chamber assembly 1 with test fluid. In some cases, the pump 9 may operate at elevated flow rates ranging from 500 microliters per minute to 10 milliliters per minute during the filling phase to minimize testing time while ensuring complete sample immersion. The water sensor 11 may actively monitor fluid levels and provide signals to the microcontroller unit 16 to confirm when the sample chamber assembly 1 reaches the appropriate fill level.

[0331] Upon receiving confirmation that the sample chamber assembly 1 is filled, the single-pump testing protocol may evaluate whether the current measurement represents the final data point in the testing sequence. In some cases, the evaluation may be based on predetermined testing duration, number of measurement cycles, or achievement of equilibrium conditions as determined through analysis of previous measurement data. If additional measurements are required, the protocol may proceed with sample preparation and measurement operations.

[0332] The single-pump testing protocol may include closing of the inlet solenoid 3 and opening of the outlet solenoid 2 to enable introduction of high-pressure air for sample drying operations. In some cases, the dry ing phase may utilize the three-way valve 12 to introduce compressed air or heated air that removes surface moisture from the sample 120 without affecting the underlying material structure. The drying phase may be controlled through timing sequences, pressure monitoring, or moisture detection systems that ensure optimal drying conditions for accurate measurement operations.

[0333] Following the drying phase, the single-pump testing protocol may close the outlet solenoid 2 and the three-way valve 12 to prepare for the measurement phase. The measurement phase may' involve switching of the three-way valve 8 and the three-way valve 10 to open the measurement circuit, opening of the outlet solenoid 6 and the bleeder solenoid 5, and activation of the pump 9 at reduced flow rates suitable for precision measurement. In some cases, the pump 9 may operate at flow rates ranging from 1 microliter per minute to 100 microliters per minute during the measurement phase to enable accurate detection of volumetric changes through the flow sensor 7.

[0334] During the measurement phase, the single-pump testing protocol may utilize the flow sensor 7 to measure fluid flow rates while the microcontroller unit 16 processes and logs measurement data for subsequent analysis. In some cases, the measurement data may be processed in real-time to calculate volumetric changes, swelling rates, or equilibrium conditions that provide immediate feedback on sample behavior. Following each measurement cycle, the pump 9 may be stopped and the solenoids may be closed to prepare for the next measurement iteration or to conclude the testing sequence.

[0335] The single-pump testing protocol may repeat the measurement loop according to predetermined schedules or adaptive algorithms that optimize measurement frequency based on observed swelling kinetics. In some cases, the protocol may increase measurement frequency during periods of rapid swelling and decrease frequency during equilibrium phases to maximize data quality7while minimizing testing time. The single-pumpconfiguration may provide cost-effective testing capabilities while maintaining measurement accuracy through careful optimization of pump operation and valve timing sequences.

[0336] Referring to FIG. 20 and FIG. 22, the microfluidic circuit may incorporate parallel testing protocols that enable simultaneous characterization of multiple samples through coordinated operation of multiple sample chambers and measurement circuits. The parallel testing approach may utilize the multi-port valve 102 to direct fluid flow between different sample chambers, enabling comparative analysis of multiple materials under identical testing conditions or evaluation of sample variability within a single material batch. The parallel testing capability may enhance testing throughput and provide statistical data that improves confidence in material characterization results.

[0337] The parallel testing protocol may begin with loading of multiple samples into corresponding sample chambers, with each sample chamber configured to hold a sample 120 of identical or different material types. In some cases, the parallel testing may accommodate 2 to 16 sample chambers, depending on the multi-port valve 102 configuration and system capacity. The sample loading may include verification of sample positioning, chamber sealing, and fluid pathway integrity to ensure proper operation of all parallel testing channels.

[0338] The parallel testing protocol may include sequential filling operations where the multi-port valve 102 directs fluid flow to individual sample chambers in predetermined sequences. In some cases, the filling sequence may involve activation of the pump 103 while the multi-port valve 102 switches between different sample chambers to provide controlled filling of each chamber. The sequential filling approach may ensure that all sample chambers receive identical fluid volumes and filling conditions, enabling accurate comparison of swelling behaviors between different samples.

[0339] Following the filling operations, the parallel testing protocol may include coordinated measurement sequences where individual sample chambers are drained and measured while other chambers remain in filled states for continued sample conditioning. In some cases, the measurement sequence may involve switching of the multi-port valve 102 to direct fluid flow from specific sample chambers through the flow sensor 105 while maintaining isolation of other chambers. The coordinated measurement approach may enable continuous monitoring of multiple samples without interrupting the conditioning process for samples that are not currently being measured.

[0340] The parallel testing protocol may incorporate staggered timing sequences that offset the measurement cycles for different sample chambers to maximize systemutilization and minimize total testing time. In some cases, staggered timing may involve initiating measurement cycles for different samples at predetermined time intervals, enabling overlapping measurement operations that increase testing throughput. The staggered approach may be particularly beneficial for materials with long equilibration times or testing protocols that require extended monitoring periods.

[0341] The parallel testing protocol may include automated data management capabilities that track measurement data for individual samples and provide comparative analysis of swelling characteristics across multiple samples. In some cases, data management may involve automated data logging, statistical analysis, and graphical presentation of results that highlight differences or similarities between sample behaviors. The comparative analysis capability may enable identification of material variability, optimization of material formulations, or validation of manufacturing consistency across sample batches.

[0342] The automated testing protocols may incorporate adaptive control algorithms that modify testing parameters based on real-time analysis of sample behavior and measurement data. In some cases, adaptive control may involve adjustment of measurement frequency, flow rates, or environmental conditions based on observed swelling kinetics or equilibrium achievement. The adaptive capability may optimize testing efficiency by reducing measurement frequency for samples that have reached equilibrium while maintaining high-frequency monitoring for samples undergoing rapid changes.

[0343] The testing protocols may include comprehensive error detection and recovery mechanisms that identify measurement anomalies, system malfunctions, or sample preparation errors and implement corrective actions to maintain testing accuracy. In some cases, error detection may involve comparison of measurement data with expected ranges, monitoring of sensor performance, or verification of system component operation. The error recovery mechanisms may include automatic recalibration, measurement repetition, or operator notification procedures that ensure reliable testing results.

[0344] The automated testing protocols may feature modular design architectures that enable customization of testing sequences, measurement parameters, and data analysis procedures for different material types and research applications. In some cases, modular design may involve programmable testing templates, configurable measurement intervals, or selectable analysis algorithms that adapt the testing system to specific research requirements. The modular capability may enable the testing system to accommodate diverse material characterization needs while maintaining standardized operation procedures and data quality standards.

[0345] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The sample integration and testing protocol design may be adapted for different material types, testing objectives, and system configurations while maintaining the fundamental principles of automated sample handling, precise volumetric measurement, and comprehensive data acquisition for material characterization applications.

[0346] System Performance and Validation Data

[0347] The microfluidic circuit may demonstrate exceptional system performance characteristics through comprehensive validation studies that confirm the technical advantages and unexpected utility of the automated measurement approach. The validation data may reveal measurement capabilities that exceed conventional gravimetric methods and provide enhanced accuracy for material characterization applications across diverse testing conditions and sample types.

[0348] Referring to FIG. 15, the microfluidic circuit may achieve demonstrated measurement accuracy that exhibits systematic error characteristics across different operational flow rates. The validation studies may reveal that flow sensor measurements consistently underestimate actual fluid volumes compared to gravimetric reference measurements, with error magnitudes that correlate with pump speed settings. In some cases, the systematic error may range from approximately -28% at lower pump speeds to approximately -40% at higher pump speeds, indicating a predictable relationship between flow rate and measurement deviation.

[0349] The systematic error characteristics may represent an unexpected technical advantage because the predictable nature of the measurement deviation enables implementation of correction algorithms that compensate for flow rate-dependent errors. In some cases, the linear relationship between pump speed and measurement error may enable development of calibration curves with correlation coefficients exceeding 0.99, providing highly accurate correction factors that transform raw sensor measurements into calibrated volumetric data. The predictable error characteristics may eliminate the need for complex calibration procedures and may enable automated correction algorithms that maintain measurement accuracy across vary ing operational conditions.

[0350] The validation data may demonstrate that application of calibration correction factors reduces measurement errors to levels within ±0.4% of gravimetric reference measurements across all tested flow rates. In some cases, the correctedmeasurement accuracy may achieve precision levels within ±0.1% to ±0.7% depending on the specific flow rate and fluid properties. The enhanced accuracy following calibration correction may represent unexpected utility because conventional flow measurement systems t pically exhibit accuracy limitations ranging from ±2% to ±5% of measured values, indicating that the microfluidic circuit achieves measurement performance that exceeds conventional flow measurement technologies by factors ranging from 5 to 12.

[0351] The microfluidic circuit may demonstrate exceptional repeatability characteristics through validation studies involving multiple measurement cycles under controlled conditions. The repeatability validation may involve measurement of identical fluid volumes delivered to sample chambers through automated dispensing protocols, with statistical analysis of measurement variations across multiple repetitions. In some cases, the repeatability studies may encompass 10 to 100 measurement cycles to establish statistical confidence in system performance characteristics.

[0352] The repeatability7validation data may reveal measurement precision levels within ±1.01% across multiple measurement cycles, indicating exceptional consistency in volumetric delivery and measurement capabilities. In some cases, the repeatability precision may achieve levels within ±0.5% to ±2.0% depending on the fluid volume, flow rate, and environmental conditions during testing. The enhanced repeatability7may represent unexpected utility because conventional manual measurement approaches typically exhibit repeatability variations ranging from ±3% to ±10% due to operator-dependent variables, environmental fluctuations, and equipment limitations.

[0353] The repeatability characteristics may enable detection of minute volumetric changes that would be masked by measurement noise in conventional systems. In some cases, the enhanced repeatability may enable detection of volumetric changes as small as 0.01 milliliters to 0. 1 milliliters, corresponding to swelling behaviors that may occur during early - stage material hydration or subtle material property changes. The enhanced sensitivity may provide access to material characterization data that may not be obtainable through conventional measurement approaches, enabling research into material behaviors that were previously undetectable.

[0354] Referring to FIG. 16, the microfluidic circuit may demonstrate exceptional capabilities for monitoring dynamic swelling behaviors through real-time measurement of material volume changes over extended time periods. The swelling measurement validation may involve characterization of potassium polyacrylate (K-PA) samples that exhibit predictable swelling kinetics when exposed to aqueous solutions. The K-PA validationstudies may provide benchmark data that confirms system capabilities for detecting and quantifying material swelling behaviors with enhanced temporal resolution and measurement accuracy.

[0355] The swelling measurement data may reveal highly linear swelling kinetics with correlation coefficients exceeding 0.986, indicating that the microfluidic circuit captures swelling behaviors with exceptional fidelity and minimal measurement noise. In some cases, the linear correlation may achieve values ranging from 0.95 to 0.999 depending on the material type, swelling rate, and measurement duration. The enhanced correlation characteristics may represent unexpected utility because conventional swelling measurement approaches often exhibit correlation coefficients ranging from 0.8 to 0.95 due to measurement uncertainties, discrete sampling limitations, and environmental variations.

[0356] The swelling rate quantification may demonstrate measurement capabilities that enable determination of swelling kinetics with precision levels that exceed conventional approaches. In some cases, the microfluidic circuit may quantify swelling rates with accuracy within ±1% to ±5% of actual swelling kinetics, compared to conventional approaches that typically achieve accuracy levels within ±10% to ±25%. The enhanced swelling rate accuracy may enable detection of subtle differences in material formulations, processing conditions, or environmental effects that may not be detectable through conventional measurement methods.

[0357] The validation data may confirm measurement accuracy through cross- validation with independent gravimetric measurements that provide reference standards for volumetric determinations. In some cases, the cross-validation studies may involve simultaneous measurement of sample mass changes using precision analytical balances with resolution capabilities exceeding 0. 1 milligrams. The gravimetric cross-validation may confirm that volumetric measurements obtained through the microfluidic circuit correspond to actual material volume changes within measurement uncertainties ranging from ±0.1% to ±1.0%.

[0358] The microfluidic circuit may demonstrate unexpected utility through measurement of swelling behaviors that exhibit complex kinetic profiles including rapid initial swelling phases followed by slower equilibration phases. In some cases, the temporal resolution capabilities may enable detection of swelling kinetics that occur over time scales ranging from seconds to hours, providing comprehensive characterization of material behaviors across multiple time domains. The enhanced temporal resolution may reveal material behaviors that may be missed by conventional discrete sampling approaches thatty pi cal 1 y provide measurement intervals ranging from minutes to hours.

[0359] The validation studies may demonstrate system capabilities for operation across diverse environmental conditions including temperature ranges from 15°C to 40°C, humidity levels from 30% to 80% relative humidity, and atmospheric pressure variations from 0.9 atmospheres to 1.1 atmospheres. In some cases, the environmental tolerance mayenable consistent measurement performance across varying laboratory conditions without requiring specialized environmental controls or calibration adjustments. The environmental robustness may represent unexpected utility because conventional measurement systems often require controlled environmental conditions to maintain measurement accuracy and repeatability.

[0360] The microfluidic circuit may achieve measurement resolution capabilities that enable detection of volumetric changes corresponding to nanoliter-scale volume variations. In some cases, the measurement resolution may achieve levels ranging from 1 nanoliter to 100 nanoliters depending on the flow sensor technology- and signal processing algorithms employed. The enhanced resolution capabilities may enable characterization of microscale materials, single-cell swelling behaviors, or early -stage material property changes that may not be detectable through conventional measurement approaches.

[0361] The validation data may demonstrate measurement stability over extended operational periods ranging from hours to days without significant drift or calibration degradation. In some cases, the measurement stability may maintain accuracy within ±2% of initial calibration values over operational periods ranging from 8 hours to 168 hours. The enhanced stability may represent unexpected utility because conventional flow measurement systems often exhibit drift characteristics that require frequent recalibration or correction procedures to maintain measurement accuracy.

[0362] The microfluidic circuit may demonstrate capabilities for simultaneous measurement of multiple samples through parallel testing protocols that maintain measurement accuracy and repeatability across multiple measurement channels. In some cases, the parallel measurement capabilities may accommodate 2 to 16 simultaneous samples while maintaining measurement precision within ±1% to ±3% across all channels. The parallel measurement capability may represent unexpected utility because conventional approaches typically require sequential measurement of individual samples, resulting in extended testing times and potential variations in environmental conditions between measurements.

[0363] The validation studies may confirm system capabilities for automatedoperation over extended periods without manual intervention or operator supervision. In some cases, the automated operation may continue for periods ranging from 4 hours to 72 hours while maintaining measurement accuracy and system reliability. The extended automated operation capability may represent unexpected utility because conventional measurement approaches typically require frequent operator intervention for sample handling, data collection, or system maintenance procedures.

[0364] The microfluidic circuit may demonstrate measurement capabilities that enable characterization of diverse material types including natural hydrogels, synthetic polymers, composite materials, and biological tissues. In some cases, the material compatibility may encompass materials with swelling ratios ranging from 1.1 to 100, corresponding to materials that exhibit minimal swelling to superabsorbent materials that absorb volumes exceeding 50 times their dry weight. The broad material compatibility may represent unexpected utility because conventional measurement approaches often exhibit limitations for specific material types or swelling ranges.

[0365] The validation data may demonstrate system capabilities for operation with diverse fluid types including aqueous solutions, buffer systems, organic solvents, and biological media without requiring system modifications or specialized calibration procedures. In some cases, the fluid compatibility' may encompass fluids with density ranges from 0.8 grams per cubic centimeter to 1.5 grams per cubic centimeter and viscosity ranges from 0.5 centipoise to 10 centipoise. The broad fluid compatibility may enable testing under physiologically relevant conditions, accelerated aging environments, or specialized research conditions that may not be accessible through conventional measurement approaches.

[0366] The microfluidic circuit may achieve measurement throughput capabilities that exceed conventional approaches through automated sample handling, parallel measurement protocols, and reduced measurement cycle times. In some cases, the measurement throughput may achieve sample processing rates ranging from 10 samples per hour to 100 samples per hour depending on the system configuration and testing protocol requirements. The enhanced throughput may represent unexpected utility because conventional approaches typically achieve processing rates ranging from 1 sample per hour to 10 samples per hour due to manual handling requirements and extended equilibration times.

[0367] The validation studies may demonstrate cost-effectiveness advantages through reduced reagent consumption, automated operation, and enhanced measurement efficiency compared to conventional approaches. In some cases, the reagent consumption may be reduced by factors ranging from 2 to 20 compared to conventional methods due toprecise fluid handling and minimal waste generation. The cost-effectiveness advantages may represent unexpected utility because conventional approaches often require substantial reagent volumes, manual labor, and extended testing times that increase overall testing costs.

[0368] The microfluidic circuit may demonstrate data quality advantages through automated data acquisition, real-time processing, and comprehensive documentation capabilities that enhance research productivity and regulatory compliance. In some cases, the automated data management may provide complete documentation of testing conditions, measurement parameters, and environmental factors that ensure traceability and reproducibility of testing results. The enhanced data quality may represent unexpected utility because conventional approaches often rely on manual data recording that may introduce transcription errors, incomplete documentation, or inconsistent data formats.

[0369] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. The system performance and validation characteristics may be adapted for different material types, testing requirements, and operational conditions while maintaining the fundamental pnnciples of enhanced measurement accuracy, automated operation, and comprehensive material characterization capabilities that provide unexpected utility compared to conventional measurement approaches.

[0370] Integrated System Operation and Functional Interactions

[0371] The microfluidic circuit may achieve comprehensive material characterization capabilities through coordinated operation of multiple system components that work together to provide real-time monitoring of liquid absorbance and swelling characteristics of soft-tissue materials. The integrated system operation may represent a technical solution to the problem of achieving high-resolution, continuous monitoring of material property changes while maintaining precise control over testing conditions and environmental parameters.

[0372] The integrated system operation may begin with automated sample preparation and positioning procedures that establish controlled initial conditions for material characterization. The sample preparation phase may involve placement of soft-tissue materials into sample chambers, verification of sample positioning through automated detection systems, and establishment of baseline measurement conditions through calibration procedures. In some cases, the sample preparation may include environmental conditioning where temperature, humidity’, and atmospheric pressure conditions may be controlled topredetermined levels that simulate physiological environments or accelerated testing conditions.

[0373] Referring to FIG. 1, the integrated system operation may utilize coordinated fluid circulation that enables controlled delivery of test fluids to sample materials while maintaining precise monitoring of volumetric changes throughout the testing cycle. The fluid circulation system may operate through coordinated pump activation, valve switching, and sensor monitoring that provides automated control of fluid flow rates, pressure conditions, and temperature parameters. In some cases, the fluid circulation may involve multiple operational phases including rapid filling phases that utilize high-flow capabilities, measurement phases that employ precision flow control, and cleaning phases that remove residual materials and prevent cross-contamination between testing cycles.

[0374] The coordinated pump operation may enable optimization of testing efficiency through selective activation of different pump systems based on the specific requirements of each operational phase. During filling operations, high-flow pumps may provide rapid sample chamber filling with flow rates ranging from 1 milliliter per minute to 50 milliliters per minute, minimizing testing time while ensuring complete sample immersion. During measurement operations, low-flow pumps may provide precise flow control with flow rates ranging from 1 microliter per minute to 500 microliters per minute, enabling accurate detection of minute volumetric changes that correspond to material swelling characteristics.

[0375] The valve network coordination may enable sophisticated flow routing that directs test fluids through specific pathways based on the operational requirements and testing protocols. Three-way valves may provide switching capabilities between multiple fluid pathways, enabling automated selection of fluid sources, routing toward different sample chambers, or direction of fluids through measurement circuits. Multi-port valves may enable sequential operation of multiple sample chambers, allowing comparative analysis of different materials under identical testing conditions while maintaining isolation between individual testing chambers.

[0376] The sensor network integration may provide comprehensive monitoring of system parameters including fluid flow rates, liquid levels, temperature conditions, and environmental factors that affect measurement accuracy and testing rel iabili ty. Flow sensors may provide real-time measurement of volumetric changes as fluids move through the system, enabling continuous monitoring of material swelling behaviors w ith temporal resolution ranging from seconds to hours. Liquid level sensors may monitor fluidaccumulation in sample chambers and waste containers, providing feedback for automated control of filling operations and prevention of overflow conditions.

[0377] The real-time data acquisition capabilities may enable continuous monitoring of material property changes through coordinated operation of multiple measurement systems that provide complementary data for enhanced measurement confidence. Volumetric measurements obtained through flow sensors may be combined with gravimetric measurements obtained through load cells to provide cross-validation of measurement results and enhanced accuracy for material characterization applications. In some cases, the combined measurement approach may enable detection of material behaviors that may not be apparent from single measurement methods and may provide enhanced accuracy for complex material characterization applications.

[0378] Referring to FIG. 20, the integrated system operation may incorporate environmental control capabilities that maintain controlled testing conditions through coordinated operation of heating elements, drying systems, and atmospheric control components. The environmental control system may provide temperature regulation ranging from ambient temperature to 80°C, enabling testing under physiological conditions, accelerated aging environments, or controlled thermal stress conditions. The drying system may provide controlled moisture removal capabilities that eliminate surface moisture effects during gravimetric measurements while preserving underlying material structure and properties.

[0379] The automated control system coordination may enable execution of complex testing protocols through programmed sequences that coordinate pump operation, valve switching, sensor monitoring, and environmental control based on predetermined testing parameters and real-time feedback from measurement systems. The control system may utilize microcontroller-based processing that provides real-time analysis of measurement data, adaptive control algorithms that modify testing parameters based on observed material behaviors, and safety interlocks that prevent equipment damage or sample loss during testing operations.

[0380] The integrated measurement cycle may begin with automated filling of sample chambers through coordinated pump activation and valve control that delivers precise volumes of test fluid to sample materials. The filling phase may be monitored through liquid level sensors that provide feedback signals when sample chambers reach predetemiined fill levels, ensuring complete sample immersion with additional fluid volume to accommodate swelling expansion. Following the filling phase, the system may initiate a conditioning periodwhere samples may be maintained in contact with test fluids for predetermined durations ranging from minutes to hours, depending on the material properties and testing objectives.

[0381] The measurement phase may involve coordinated drainage of sample chambers while simultaneously monitoring fluid flow rates through precision flow sensors that detect volumetric changes corresponding to material swelling characteristics. The drainage operation may be controlled through automated valve switching and pump activation that provides consistent flow conditions and measurement accuracy. In some cases, the measurement phase may include coordinated operation of drying systems that remove surface moisture from samples and system components, enabling accurate gravimetric measurements that complement volumetric data obtained through flow sensors.

[0382] The data processing integration may enable real-time analysis of measurement data through coordinated operation of multiple processing systems that provide immediate feedback on material behaviors and testing progress. The data processing may include automated calculation of swelling ratios, kinetic parameters, and equilibrium conditions based on continuous monitoring of volumetric changes over time. In some cases, the data processing may incorporate adaptive algorithms that modify measurement frequency based on observed swelling kinetics, increasing measurement frequency during periods of rapid material changes and decreasing frequency during equilibrium phases to optimize data quality while minimizing testing time.

[0383] Referring to FIG. 22, the integrated system operation may enable parallel testing capabilities through coordinated operation of multiple sample chambers and measurement circuits that provide simultaneous characterization of multiple materials under identical testing conditions. The parallel testing operation may utilize multi-port valve systems that enable sequential or simultaneous fluid delivery to multiple sample chambers while maintaining isolation between individual testing channels. The parallel testing capability may enhance testing throughput by factors ranging from 2 to 16 compared to sequential testing approaches, depending on the system configuration and number of parallel testing channels.

[0384] The coordinated parallel operation may involve staggered timing sequences that offset measurement cycles for different sample chambers to maximize system utilization and minimize total testing time. The staggered timing may enable overlapping measurement operations where individual sample chambers may be filled, conditioned, measured, and cleaned in coordinated sequences that maintain continuous system operation without idle periods. In some cases, the staggered operation may enable testing of materials with differentequilibration times or kinetic behaviors within the same testing session, providing comparative data that enhances understanding of material property variations.

[0385] The integrated cleaning and maintenance capabilities may enable automated system preparation between testing cycles through coordinated operation of cleaning fluid delivery', rinse cycles, and sterilization procedures that remove residual materials and prevent cross-contamination. The cleaning system may utilize dedicated cleaning fluid reservoirs, automated valve switching, and programmable cleaning sequences that ensure proper system hygiene and measurement accuracy. In some cases, the cleaning system may incorporate multiple cleaning phases including rinse cycles using deionized water, detergent cycles using specialized cleaning solutions, and sterilization cycles using chemical or thermal sterilization methods.

[0386] The system integration may provide technical advantages that exceed the capabilities of individual system components through synergistic interactions that enhance measurement accuracy, testing efficiency, and operational reliability7. The coordinated operation of multiple pump systems may enable optimization of both testing speed and measurement precision through selective activation of high-flow pumps for rapid operations and low-flow pumps for precision measurements. The integration of multiple sensor systems may provide redundant measurement capabilities that enhance measurement confidence and enable detection of system malfunctions or measurement anomalies.

[0387] The automated control integration may enable execution of complex testing protocols that would be difficult or impossible to achieve through manual operation, including precise timing control, coordinated multi-chamber operation, and adaptive measurement protocols that respond to real-time analysis of material behaviors. The automated operation may eliminate operator-dependent variables that affect measurement repeatability in conventional approaches, providing enhanced consistency and reliability for material characterization applications.

[0388] The integrated system operation may enable measurement capabilities that represent unexpected utility compared to conventional material characterization approaches. The combination of microfluidic flow control with real-time volumetric measurement may provide temporal resolution capabilities that enable detection of rapid swelling kinetics occurring over time scales ranging from seconds to minutes, which may be missed by conventional discrete sampling approaches. The integration of multiple measurement modalities may enable cross-validation of measurement results and detection of measurement errors or system malfunctions that could compromise data quality7in single-measurementapproaches.

[0389] The coordinated environmental control capabilities may enable testing under controlled conditions that simulate physiological environments, accelerated aging conditions, or specialized research environments that may not be accessible through conventional measurement approaches. The integration of temperature control, atmospheric control, and fluid composition control may enable systematic investigation of environmental effects on material properties, providing comprehensive characterization data that enhances understanding of material behaviors under diverse conditions.

[0390] The integrated data management capabilities may provide comprehensive documentation of testing conditions, measurement parameters, and environmental factors that ensure traceability and reproducibility of testing results. The automated data acquisition may eliminate transcription errors and incomplete documentation that may occur with manual data recording approaches, providing enhanced data quality and regulatory compliance capabilities. In some cases, the integrated data management may include automated data analysis, statistical processing, and report generation that enhance research productivity and reduce time requirements for data interpretation.

[0391] The system integration may enable scalable operation that accommodates diverse testing requirements through modular component configurations and programmable control protocols. The modular design may enable system customization for different material types, testing objectives, and throughput requirements while maintaining standardized operation procedures and data quality standards. The programmable control capabilities may enable development of specialized testing protocols for specific research applications or regulator}' compliance requirements without requiring hardware modifications or system reconfiguration.

[0392] The integrated system operation may provide cost-effectiveness advantages through reduced reagent consumption, automated operation, and enhanced measurement efficiency compared to conventional approaches. The precise fluid handling capabilities may reduce reagent consumption by factors ranging from 2 to 20 compared to conventional methods due to accurate volumetric control and minimal waste generation. The automated operation may reduce labor requirements and enable extended operation without manual supervision, providing enhanced productivity and reduced operational costs for material characterization applications.

[0393] Those skilled in the art will recognize that various modifications and variations can be made without departing from the spirit and scope of the invention. Theintegrated system operation may be adapted for different material ty pes, testing requirements, and operational conditions while maintaining the fundamental principles of coordinated component operation, real-time monitoring capabilities, and automated control that provide enhanced material characterization capabilities compared to conventional measurement approaches.

[0394] EXAMPLES

[0395] Aspects of the present teachings may be further understood in light of the following examples, which should not be construed as limiting the scope of the present teachings in any way.

[0396] Example 1: Volumetric Measurement Method

[0397] This table shows the results of an experiment (labeled "Table 1" below) designed to compare the measured liquid weight using two methods:

[0398] Laboratory Balance (w eight of liquid added, determined by the change in beaker weight)

[0399] Flow Sensor (volume estimated via a sensor)

[0400] The goal is to evaluate the accuracy of the flow sensor at different pump speeds, over a 5-minute interval.

[0401] Structure of the Table

[0402] Each speed setting (25, 35, and 50) corresponds to different flow rates (FR), and each was tested over three trials.

[0403] Columns:

[0404] Initial / Final Weight Beaker: Used to compute gravimetric mass delivered (Final - Initial)

[0405] Measured Weight (beaker): Resulting difference in weight in milligrams (calculated)

[0406] Measured Weight (flow sensor): What the sensor recorded for each trial

[0407] Error: Percentage difference between sensor and gravimetric measurement

[0408] Corrected Abs Error: A post-correction (likely calibration-adjusted) absolute error

[0409] Key Takeaways

[0410] 1. Sensor Underestimation:

[0411] The raw error values are negative across all speeds and trials, meaning the flow sensor consistently underestimates the actual amount delivered (compared to the beaker method).

[0412] The underestimation gets worse at higher speeds:

[0413] 25 speed (83ul / min) - -28%

[0414] 35 speed (115. lul / min) — ~ -33%

[0415] 50 speed (158.7ul / min) ~ -40%

[0416] 2. Corrected Absolute Error:

[0417] After some correction using a best-fit calibration (table 2) the absolute errors drop significantly, all under 1%.

[0418] The average corrected error across all 9 trials is 0.4%, which is quite good — indicating a reliable correction method.

[0419] Conclusion

[0420] This dataset demonstrates that:

[0421] The raw flow7sensor data is not accurate by itself.

[0422] Ho ever, when corrected, the flow sensor data can match the gravimetric method within a small error margin (-0.4%).

[0423] This suggests a strong calibration model or correction approach that allows the sensor to replace or supplement gravimetric methods, even at varied flow7rates. FIG. 15 provides a summary of these results.

[0424] Repeatability of 3ml sample chamber volume measurement

[0425] Purpose

[0426] This table evaluates the repeatability and precision of volume delivery into the sample chamber by comparing weight differences in a beaker before and after dispensing.

[0427] Key Findings

[0428] Chamber Weight across 10 trials ranged from 2.415 g to 2.501 g

[0429] The average delivered mass is 2.461 g

[0430] The standard deviation is just 0.025 g, indicating tight consistency

[0431] Precision is calculated at 1.01%, demonstrating excellent repeatability

[0432] Conclusion

[0433] The system consistently delivers nearly identical volumes to the sample chamber across multiple runs. With a precision of ~1%. this level of repeatability- confirms that the dispensing mechanism is highly reliable and well-suited for automated testing environments where reproducibility is critical.

[0434] Example 2: K-PA Swelling Test

[0435] Overview

[0436] FIG. 16 shows how a K-PA (potassium polyacrylate) sample swells over time during fluid absorption. The sample weight (mg) is recorded at 1 -minute intervals for 15 minutes.

[0437] Key Takeaways

[0438] Strong Linear Swelling Behavior:The data follows a clear upward trend, with a best-fit linear equation of: y = 20.915x. where y is the sample weight in mg and x is time in minutes.

[0439] Excellent Fit (R2= 0.9867):This high coefficient of determination indicates that the swelling process is highly consistent and predictable, with minimal deviation from the linear model.

[0440] Swelling Rate:The slope (-20.92 mg / min) reflects the swelling rate of the material — a useful parameter for comparing across different gel types or conditions.

[0441] Conclusion

[0442] This swelling test demonstrates exceptional consistency, with a highly linear uptake profile. The automated data collection is clearly resolving fine-scale changes over time, making it ideal for kinetic modeling or formulation comparisons.

[0443] The final weight was confirmed as 322mg on the scale which confirms the 324mg measurement provided by the system.

[0444] This test proves the system is able to measure the change of mass / volume in a sample over time accurately and effectively.

[0445]

[0446] Example 3: Volumetric Flow Sensor Calibration and Accuracy Validation

[0447] A technician calibrates the flow sensor 7 of the microfluidic circuit to establish accurate volumetric measurement capabilities for real-time monitoring of material swelling characteristics. The calibration protocol begins with preparation of reference fluid volumes using deionized water at 25°C with known density of 0.997 grams per cubic centimeter. The technician connects a precision analytical balance with 0. 1 milligram resolution to measure actual fluid masses delivered through the system.

[0448] The calibration procedure involves operating the pump 9 at three different speed settings corresponding to flow rates of approximately 83 microliters per minute, 115 microliters per minute, and 159 microliters per minute. For each speed setting, the technician conducts three replicate measurements where the pump 9 delivers fluid through the flow sensor 7 for exactly 5 minutes while simultaneously collecting the delivered fluid in a preweighed container positioned on the analytical balance.

[0449] The flow sensor 7 records volumetric flow data in real-time through the microcontroller unit 16, which logs the cumulative volume measurements at 1 -secondintervals throughout each 5-minute delivery period. Simultaneously, the analytical balance measures the actual mass of fluid delivered, which the technician converts to volume using the known fluid density.

[0450] The expected results demonstrate systematic underestimation by the flow sensor 7, with measurement errors of approximately -28% at the lowest flow rate, -33% at the medium flow rate, and -40% at the highest flow rate. The linear relationship between pump speed and measurement error exhibits a correlation coefficient exceeding 0.99. enabling development of a correction algorithm with the equation: Corrected Volume = Raw Sensor Reading I (1 - 0.0046 x Pump Speed - 0.1946).

[0451] Application of this correction algorithm reduces measurement errors to within ±0.4% of gravimetric reference measurements across all tested flow rates. The technician validates the correction accuracy through additional testing with 10 replicate measurements at each flow rate, confirming that corrected flow sensor measurements achieve accuracy within ±0.7% of actual delivered volumes. This calibration enables the flow sensor 7 to provide precise volumetric measurements for detecting minute changes in sample swelling characteristics dunng automated testing procedures.

[0452] Example 4: Automated Sample Chamber Filling and Measurement Protocol

[0453] A technician demonstrates the automated operation of the sample chamber assembly 1 and associated control systems for real-time monitoring of hydrogel swelling characteristics. The testing protocol begins with preparation of a potassium polyacrylate (K- PA) hydrogel sample with initial dry mass of 25 milligrams, which the technician places into the sample chamber assembly 1 using sterile handling techniques to prevent contamination.

[0454] The automated testing sequence initiates when the technician activates the microcontroller unit 16, which executes a programmed protocol for hydrogel characterization. The microcontroller unit 16 first opens the inlet solenoid 3 and activates the high-flow pump 14 at 2 milliliters per minute to rapidly fill the sample chamber assembly 1 with deionized water at 25°C. The water sensor 11 monitors the filling process and provides feedback signals to the microcontroller unit 16 when the fluid level reaches the predetermined fill height of 15 millimeters above the sample surface.

[0455] Upon completion of filling, the microcontroller unit 16 closes the inlet solenoid 3 and initiates a 15-minute conditioning period during which the K-PA sample undergoes swelling while immersed in the test fluid. During this conditioning period, thesample chamber assembly 1 remains sealed to prevent evaporation, and the microcontroller unit 16 monitors environmental conditions including temperature stability within ±0.5°C.

[0456] Following the conditioning period, the microcontroller unit 16 initiates the measurement sequence by opening the outlet solenoid 2 and activating the low-flow pump 15 at 100 microliters per minute to drain the sample chamber assembly 1 while monitoring fluid flow through the flow sensor 7. The flow sensor 7 measures the total volume of fluid displaced from the sample chamber assembly 1. which corresponds to the available fluid volume after accounting for the space occupied by the swollen sample.

[0457] The expected results demonstrate linear swelling kinetics with the sample mass increasing from 25 milligrams to approximately 325 milligrams over the 15-minute conditioning period, corresponding to a swelling ratio of 13: 1. The flow sensor 7 measurements reveal a progressive decrease in available fluid volume within the sample chamber assembly 1, with volumetric changes that correlate with the gravimetrically measured mass increases with a correlation coefficient exceeding 0.986.

[0458] The automated measurement cycle repeats at 1 -minute intervals throughout the 15-minute testing period, generating a complete swelling kinetics profile that exhibits the linear relationship: Sample Mass (mg) = 20.915 x Time (minutes) + Initial Mass. The microcontroller unit 16 automatically calculates swelling parameters including swelling rate, equilibrium swelling ratio, and kinetic constants, providing comprehensive characterization data without manual intervention. The automated protocol demonstrates measurement repeatability within ±1% across multiple testing cycles, confirming the reliability of the integrated measurement system.

[0459] Example 5: Multi-Port Valve Coordination for Parallel Sample Testing

[0460] A technician demonstrates the coordinated operation of the multi-port valve 102 and associated control systems for simultaneous characterization of multiple hydrogel samples under identical testing conditions. The parallel testing protocol begins with preparation of four different hydrogel samples including agarose, alginate, chitosan, and polyacrylamide, each with initial dry mass of 50 milligrams. The technician places each sample into separate sample chambers 104 within the multi-chamber testing array.

[0461] The automated parallel testing sequence initiates when the technician programs the microcontroller 107 with a coordinated testing protocol that manages fluid delivery to multiple sample chambers 104 through sequential operation of the multi-port valve 102. The microcontroller 107 first positions the multi-port valve 102 to direct fluidflow from the reservoir 100 to the first sample chamber 104 containing the agarose sample. The pump 103 activates at 5 milliliters per minute to rapidly fill the first sample chamber 104 while the liquid level sensor 111 monitors the filling progress.

[0462] Upon completion of filling the first sample chamber 104, the microcontroller 107 switches the multi-port valve 102 to the second position and repeats the filling procedure for the sample chamber 104 containing the alginate sample. This sequential filling process continues for all four sample chambers 104. with each chamber receiving identical fluid volumes of 10 milliliters within ±0.1 milliliter accuracy. The entire filling sequence completes within 8 minutes, ensuring that all samples begin their conditioning periods under nearly identical timing conditions.

[0463] Following the filling phase, the microcontroller 107 initiates staggered measurement cycles where individual sample chambers 104 undergo drainage and volumetric measurement while other chambers remain in conditioning states. The multi-port valve 102 switches between sample chambers 104 at 5-minute intervals, directing fluid flow from each chamber through the flow sensor 105 to measure the volume displaced by swollen samples. The staggered measurement approach enables continuous monitoring of all four samples while maintaining isolation between individual testing chambers.

[0464] The expected results demonstrate distinct swelling behaviors for each hydrogel type, with agarose exhibiting rapid initial swelling followed by equilibration within 30 minutes, alginate showing steady linear swelling over 60 minutes, chitosan displaying pH- dependent swelling kinetics, and polyacrylamide demonstrating temperature-sensitive swelling characteristics. The flow sensor 105 measurements reveal volumetric changes ranging from 2-fold swelling for agarose to 15-fold swelling for polyacrylamide, with measurement precision within ±2% across all parallel testing channels.

[0465] The coordinated parallel testing protocol enables simultaneous characterization of all four samples within 90 minutes, compared to 6 hours required for sequential testing of individual samples. The microcontroller 107 automatically generates comparative analysis data including swelling rate constants, equilibrium swelling ratios, and kinetic parameters for each material type. The parallel testing capability demonstrates measurement consistency across multiple channels with inter-channel variability within ±3%, confirming the reliability of the multi-port valve 102 coordination and automated control systems for high-throughput material characterization applications.

[0100] Other Embodiments

[0101] The detailed description set-forth above is provided to aid those skilled in the art in practicing the present invention. However, the invention described and claimed herein is not to be limited in scope by the specific embodiments herein disclosed because these embodiments are intended as illustration of several aspects of the invention. Any equivalent embodiments are intended to be within the scope of this invention. Indeed, various modifications of the invention in addition to those shown and described herein will become apparent to those skilled in the art from the foregoing description which do not depart from the spirit or scope of the present inventive discovery. Such modifications are also intended to fall within the scope of the appended claims.

[0102] References Cited

[0103] All publications, patents, patent applications and other references cited in this application are incorporated herein by reference in their entirety for all purposes to the same extent as if each individual publication, patent, patent application or other reference was specifically and individually indicated to be incorporated by reference in its entirety for all purposes. Citation of a reference herein shall not be construed as an admission that such is prior art to the present invention.

Claims

CLAIMSWhat is claimed is:

1. A device for real-time monitoring of liquid absorbance and swelling characteristics of soft-tissue materials, comprising: a microfluidics circuit configured to monitor volumetric changes in fluids pumped through the circuit; a sample chamber assembly (1) for holding a sample of the soft-tissue material; a flow chamber assembly (4) connected to the microfluidics circuit and the sample chamber assembly (1); a flow sensor (7) positioned within the microfluidics circuit and configured to measure flow rate of fluids passing through the circuit; and a control system configured to control the microfluidics circuit and to collect data related to the volumetric changes in the fluids and the swelling characteristics of the soft-tissue material.

2. The device of claim 1, wherein the flow sensor (7) is configured to provide real-time data to the control system.

3. The device of claim 1, wherein the sample chamber assembly (1) is configured to hold a hydrogel sample.

4. The device of claim 1, wherein the flow chamber assembly (4) is connected to the microfluidics circuit and the sample chamber assembly (1) via a series of valves.

5. The device of claim 4, wherein the series of valves comprises an inlet solenoid (3) and an outlet solenoid (2) connected to the sample chamber assembly (1).

6. The device of claim 5, wherein the series of valves further comprises a bleeder solenoid (5) and an outlet solenoid (6) connected to the flow chamber assembly (4).

7. The device of claim 1, wherein the control system is configured to adjust the flow rate of the fluids based on the collected data.

8. The device of claim 1, further comprising a temperature sensor configured to monitor the temperature of the fluids in the microfluidics circuit.

9. The device of claim 1 , further comprising a water sensor (11) positioned to monitor fluid levels within the sample chamber assembly (1).

10. The device of claim 1 , further comprising a pump (9) configured to circulate fluids through the microfluidics circuit.

11. The device of claim 10, further comprising a high-flow pump (14) and a low- flow pump (15) configured to provide different flow rates during different phases of testingoperations.

12. The device of claim 11, wherein the high-flow pump (14) is configured to operate at flow rates ranging from 500 microliters per minute to 50 milliliters per minute.

13. The device of claim 11, wherein the low-flow pump (15) is configured to operate at flow rates ranging from 1 microliter per minute to 100 microliters per minute.

14. The device of claim 1, further comprising a three-way valve (12) configured to manage air pressure within the sample chamber assembly (1).

15. The device of claim 14, wherein the three-way valve (12) is configured to introduce ambient air or high-pressure air to facilitate sample drying or saturation.

16. The device of claim 1, further comprising a reservoir (13) configured to store test fluids for circulation through the microfluidics circuit.

17. The device of claim 1, wherein the control system comprises a microcontroller unit (16) configured to coordinate operations of system components.

18. The device of claim 17, further comprising a power supply (17) configured to provide electrical energy to the microcontroller unit (16) and other system components.

19. The device of claim 1, wherein the sample chamber assembly (1) comprises a sample chamber top (18), a sample chamber middle (19), and a sample chamber bottom (20).

20. The device of claim 19, wherein the sample chamber assembly (1) features a modular design allowing for easy assembly and disassembly of components.

21. The device of claim 1, wherein the flow chamber assembly (4) comprises a flow chamber top (22) and a flow chamber bottom (21).

22. The device of claim 21, wherein the flow chamber top (22) includes an inlet port and the flow chamber bottom (21) includes an outlet port.

23. The device of claim 2, wherein the flow sensor (7) is configured to achieve volumetric resolution capabilities ranging from 1 microliter to 100 nanoliters.

24. The device of claim 7, wherein the control system is configured to automatically control the microfluidics circuit based on predetermined parameters.

25. The device of claim 3, wherein the hydrogel sample comprises natural hydrogels, synthetic hydrogels, or composite materials.

26. A method for real-time monitoring of liquid absorbance and swelling characteristics of soft-tissue materials, comprising: providing a device comprising a microfluidics circuit, a sample chamber assembly(1). a flow chamber assembly (4), and a control system; placing a sample of the soft-tissue material in the sample chamber assembly (1);pumping a fluid through the microfluidics circuit and into the flow chamber assembly (4): monitoring volumetric changes in the fluid using a flow sensor (7) positioned within the microfluidics circuit; and collecting data related to the volumetric changes in the fluid and the swelling characteristics of the soft-tissue material using the control system.

27. The method of claim 26, wherein the soft-tissue material is a hydrogel.

28. The method of claim 27, wherein the hydrogel is used for medical applications.

29. The method of claim 26, further comprising a step of adjusting the flow rate of the fluids based on the collected data.

30. The method of claim 26, wherein the control system is configured to provide real-time data.

31. The method of claim 26, wherein the microfluidics circuit includes a temperature sensor configured to monitor the temperature of the fluids.

32. The method of claim 26, wherein the control system is configured to automatically control the microfluidics circuit based on predetermined parameters.

33. The method of claim 26, further comprising a step of filling the sample chamber assembly (1) with test fluid using a pump (9) configured to circulate fluids through the microfluidics circuit.

34. The method of claim 33, wherein the step of filling comprises operating a high-flow pump (14) at flow rates ranging from 500 microliters per minute to 50 milliliters per minute.

35. The method of claim 34, further comprising a step of switching to a low-flow pump (15) for measurement operations at flow rates ranging from 1 microliter per minute to 100 microliters per minute.

36. The method of claim 26, further comprising a step of monitoring fluid levels within the sample chamber assembly (1) using a water sensor (11).

37. The method of claim 36, wherein the water sensor (11) provides feedback signals when the sample chamber assembly (1) reaches a predetermined fill level.

38. The method of claim 26, further comprising a step of controlling air pressure within the sample chamber assembly (1) using a three-w ay valve (12).

39. The method of claim 38, wherein the three-way valve (12) introduces ambient air or high-pressure air to facilitate sample drying or saturation.

40. The method of claim 26, further comprising a step of storing test fluids in a reservoir (13) for circulation through the microfluidics circuit.

41. The method of claim 26, wherein the control system comprises a microcontroller unit (16) that coordinates operations of system components.

42. The method of claim 41, further comprising a step of providing electrical energy to the microcontroller unit (16) using a power supply (17).

43. The method of claim 26, wherein the sample chamber assembly (1) comprises a sample chamber top (18), a sample chamber middle (19), and a sample chamber bottom (20).

44. The method of claim 43, further comprising a step of assembling and disassembling the sample chamber top (18). sample chamber middle (19), and sample chamber bottom (20) for cleaning and maintenance.

45. The method of claim 26, wherein the flow chamber assembly (4) comprises a flow chamber top (22) and a flow chamber bottom (21).

46. The method of claim 45, wherein fluid enters through an inlet port in the flow chamber top (22) and exits through an outlet port in the flow chamber bottom (21).

47. The method of claim 26, wherein the flow sensor (7) achieves volumetric resolution capabilities ranging from 1 microliter to 100 nanoliters.

48. The method of claim 30, wherein the real-time data enables detection of rapid swelling kinetics occurring over time scales ranging from seconds to minutes.

49. The method of claim 27, wherein the hydrogel comprises natural hydrogels, synthetic hydrogels, or composite materials.

50. The method of claim 32, wherein the predetermined parameters include flow rates, temperature conditions, and measurement timing sequences for automated testing protocols.

51. A system for real-time monitoring of liquid absorbance and swelling characteristics of soft-tissue materials, comprising: a device comprising a microfluidics circuit, a sample chamber assembly (1), a flow chamber assembly (4). and a control system; a data collection module configured to collect data related to volumetric changes in fluids pumped through the microfluidics circuit and swelling characteristics of a sample of the soft-tissue material placed in the sample chamber assembly (1); a data analysis module configured to analyze the collected data to determine the liquid absorbance and swelling characteristics of the soft-tissue material; anda flow sensor (7) positioned within the microfluidics circuit and configured to provide real-time flow rate measurements to the control system.

52. The system of claim 51, wherein the flow sensor (7) is configured to provide real-time data with volumetric resolution capabilities ranging from 1 microliter to 100 nanoliters.

53. The system of claim 51, wherein the sample chamber assembly (1) is configured to hold a hydrogel sample.

54. The system of claim 53, wherein the hydrogel sample comprises natural hydrogels, synthetic hydrogels, or composite materials.

55. The system of claim 51, wherein the flow chamber assembly (4) is connected to the microfluidics circuit and the sample chamber assembly (1) via a series of valves.

56. The system of claim 55, wherein the series of valves comprises an inlet solenoid (3) and an outlet solenoid (2) connected to the sample chamber assembly (1).

57. The system of claim 56, wherein the series of valves further comprises a bleeder solenoid (5) and an outlet solenoid (6) connected to the flow chamber assembly (4).

58. The system of claim 51, wherein the control system is configured to adjust flow rates of fluids based on the collected data.

59. The system of claim 51, further comprising a temperature sensor configured to monitor temperature of fluids in the microfluidics circuit.

60. The system of claim 51, further comprising a water sensor (11) positioned to monitor fluid levels within the sample chamber assembly (1).

61. The system of claim 60, wherein the water sensor (11) provides feedback signals when the sample chamber assembly (1) reaches a predetermined fill level.

62. The system of claim 51, further comprising a pump (9) configured to circulate fluids through the microfluidics circuit.

63. The system of claim 62, further comprising a high-flow pump (14) and a low- flow7pump (15) configured to provide different flow7rates during different phases of testing operations.

64. The system of claim 63, wherein the high-flow7pump (14) is configured to operate at flow rates ranging from 500 microliters per minute to 50 milliliters per minute.

65. The system of claim 63, wherein the low-flow7pump (15) is configured to operate at flow rates ranging from 1 microliter per minute to 100 microliters per minute.

66. The system of claim 51, further comprising a three-way valve (12) configured to manage air pressure within the sample chamber assembly (1).

67. The system of claim 66, wherein the three-way valve (12) is configured to introduce ambient air or high-pressure air to facilitate sample drying or saturation.

68. The system of claim 51, further comprising a reservoir (13) configured to store test fluids for circulation through the microfluidics circuit.

69. The system of claim 51, wherein the control system comprises a microcontroller unit (16) configured to coordinate operations of system components.

70. The system of claim 69, further comprising a power supply (17) configured to provide electrical energy to the microcontroller unit (16) and other system components.

71. The system of claim 51, wherein the sample chamber assembly (1) comprises a sample chamber top (18), a sample chamber middle (19), and a sample chamber bottom (20).

72. The system of claim 71, wherein the sample chamber assembly (1) features a modular design allowing for easy assembly and disassembly of components.

73. The system of claim 51, wherein the flow chamber assembly (4) comprises a flow chamber top (22) and a flow chamber bottom (21).

74. The system of claim 73, wherein the flow chamber top (22) includes an inlet port and the flow chamber bottom (21) includes an outlet port.

75. The system of claim 51, wherein the data analysis module is configured to calculate swelling ratios, kinetic parameters, and equilibrium conditions based on continuous monitoring of volumetric changes over time.

76. A microfluidic device for automated material characterization, comprising: a multi-port valve (102) configured to control fluid routing between multiple pathways; a sample chamber (104) connected to the multi-port valve (102) and configured to hold a sample material; a pump (103) positioned downstream of the multi-port valve (102) and configured to drive fluid circulation through the sample chamber (104); a flow sensor (105) positioned to measure fluid flow rates as fluids exit the sample chamber (104); and a microcontroller (107) configured to coordinate operation of the multi-port valve (102), the pump (103), and the flow sensor (105) for automated testing protocols.

77. The microfluidic device of claim 76, further comprising a reserv oir (100) configured to supply test fluids to the multi-port valve (102).

78. The microfluidic device of claim 77, further comprising a 3V (101) positionedbetween the reservoir (100) and the multi-port valve (102) to control fluid routing.

79. The microfluidic device of claim 78, wherein the 3 V (101) is configured to switch fluid flow between different operational pathways.

80. The microfluidic device of claim 76, further comprising a waste container (106) positioned to collect fluids after testing operations.

81. The microfluidic device of claim 80, further comprising a liquid level sensor (111) integrated with the waste container (106) to monitor fluid accumulation.

82. The microfluidic device of claim 81, wherein the liquid level sensor (111) provides feedback signals to the microcontroller (107) to prevent overflow conditions.

83. The microfluidic device of claim 76, wherein the multi-port valve (102) is configured to switch between 3 to 16 different flow pathways.

84. The microfluidic device of claim 83, wherein the multi-port valve (102) operates through stepper motor control with positioning accuracy ranging from ±0.1 degrees to ±1.0 degrees.

85. The microfluidic device of claim 76, wherein the sample chamber (104) is configured to accommodate sample volumes ranging from 1 nanoliter to 10 milliliters.

86. The microfluidic device of claim 85, wherein the sample chamber (104) is constructed from biocompatible materials including polytetrafluoroethylene or medical-grade stainless steel.

87. The microfluidic device of claim 76. wherein the pump (103) is configured to operate at flow rates ranging from 1 microliter per minute to 10 milliliters per minute.

88. The microfluidic device of claim 87, wherein the pump (103) comprises a peristaltic pump mechanism that provides gentle fluid handling without contamination.

89. The microfluidic device of claim 76, wherein the flow sensor (105) is configured to achieve volumetric resolution capabilities ranging from 100 nanoliters to 1 microliter.

90. The microfluidic device of claim 89, wherein the flow sensor (105) operates using thermal sensing principles to detect flow-induced heat transfer.

91. The microfluidic device of claim 90. wherein the flow sensor (105) comprises micro-machined thermal sensors fabricated on silicon substrates.

92. The microfluidic device of claim 76, further comprising a load cell (108) positioned to measure weight changes of samples during testing procedures.

93. The microfluidic device of claim 92. wherein the load cell (108) provides mass measurement resolution greater than 1 nanogram.

94. The microfluidic device of claim 93, further comprising a drying system (110) configured to remove surface moisture from samples before gravimetric measurements.

95. The microfluidic device of claim 94, wherein the dr ing system (110) operates using high-pressure air jets at pressures ranging from 2 bar to 10 bar.

96. The microfluidic device of claim 76, further comprising a heating element (112) positioned adjacent to the sample chamber (104) to provide temperature control.

97. The microfluidic device of claim 96. wherein the heating element (112) comprises a thermoelectric heater configured to maintain temperatures within ±0.1 °C to ±1.0°C.

98. The microfluidic device of claim 76, further comprising a single port (109) integrated with the sample chamber (104) to provide specialized fluid management capabilities.

99. The microfluidic device of claim 98, wherein the single port (109) enables controlled venting operations to release excess pressure from the sample chamber (104).

100. The microfluidic device of claim 76, wherein the microcontroller (107) is configured to execute parallel testing protocols for simultaneous characterization of multiple samples.

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