Mechanical Reagent Dispensing for Point-of-Care Diagnostics
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Solution Overview
Problem
Modern biological techniques for nucleic acid analysis require centralized laboratory facilities, trained technicians, and specific resources, limiting their utility in point-of-care and resource-limited settings due to the need for sample preparation, refrigeration, and other infrastructure.
Innovation Solution
A reagent dispensing device with a substrate having chambers and a pushing unit that moves in a circular or perpendicular path to dispense reagents into chambers, allowing for controlled release of reagents without electrical power, enabling efficient sample preparation and analysis in resource-constrained environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized laboratory facilities and equipment are used for nucleic acid analysis, then analysis accuracy and reliability are improved, but device complexity and infrastructure requirements increase
Solution Approach 1:
The device is divided into separate functional modules: a substrate with chambers for sample processing, resistant units containing reagents, and a pushing unit for fluid delivery. This segmentation allows each component to be optimized independently while maintaining overall system reliability without requiring complex centralized infrastructure.
Solution Approach 2:
The device is designed to perform sample preparation and analysis autonomously using integrated reagent storage and delivery mechanisms. The pushing unit automatically dispenses reagents from resistant units into chambers, eliminating the need for external pipetting equipment, refrigeration, or trained technicians.
2Measurement precision
If sample preparation and analysis are performed in centralized laboratories, then diagnostic accuracy is improved, but loss of time and accessibility worsen
Solution Approach 1:
The device merges sample preparation, reagent mixing, and analysis functions into a single integrated platform. The substrate integrates chambers for lysing, binding, washing, and detection, allowing all steps to occur in one location without transferring samples between separate laboratory equipment, thereby maintaining diagnostic accuracy while dramatically reducing time to result.
Solution Approach 2:
Reagents are pre-loaded into resistant units and stored on the device ready for use. The pushing unit is pre-configured to deliver specific reagent volumes to specific chambers at predetermined times, eliminating preparation time and enabling immediate analysis when a sample is introduced.
3Stability of the object's composition
If electrical power and refrigeration are provided, then reagent stability and sample preservation are improved, but use of energy and device complexity increase
Solution Approach 1:
The device uses disposable resistant units containing pre-formulated reagents that are stable at room temperature. These single-use units eliminate the need for refrigeration, reducing energy consumption while maintaining reagent stability throughout the assay period. After use, the entire substrate can be discarded, eliminating cleaning and sterilization requirements.
Solution Approach 2:
The reagents are formulated with modified chemical parameters (such as buffer composition and stabilizers) that allow them to remain stable without refrigeration. The resistant units are designed to maintain appropriate temperature and protection from contamination until the moment of use, enabling room-temperature operation.
4Reliability
If trained technicians and specialized equipment are used, then operation reliability is improved, but ease of operation worsens
Solution Approach 1:
The device performs all complex operations autonomously: the pushing unit automatically delivers reagents, the chambers perform sequential processing steps, and the system manages timing and volumes without user intervention. This self-service capability maintains operational reliability through precise mechanical control while reducing the skill level required to operate the device to minimal training.
Solution Approach 2:
The device replaces manual laboratory techniques (pipetting, vortexing, centrifugation) with an integrated mechanical system. The pushing unit uses mechanical displacement to deliver precise reagent volumes, and the chamber design incorporates mechanical features for mixing and separation, eliminating the need for technicians to perform manual operations.
Data Source
AI summary
The present invention relates to fluidic systems for controlling one or more fluids and/or one or more reagents. These systems can be used in combination with one or more devices for assaying, processing, and/or storing samples. In particular, the systems and related methods can allow for dispensing fluid in a controlled manner and/or introducing pause(s) when implementing assays or processes.