Capillary Pressure Reset for Lateral Flow Assays
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Solution Overview
Problem
Lateral flow assays face limitations in accuracy, sensitivity, and multiplexing capabilities due to inherent weaknesses such as hematocrit variability, flow inconsistencies, and complexity of use, which restrict their availability and market potential.
Innovation Solution
The implementation of capillary pressure re-set technology using a soluble matrix with high capillarity to automatically aliquot and deliver liquids to lateral flow assays, enabling passive extraction and metering of plasma from whole blood, and integration with microfluidic structures for enhanced sensitivity and multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual processing steps are added to improve lateral flow assay performance, then accuracy and sensitivity improve, but device complexity and ease of operation worsen
Solution Approach 1:
The device performs sample preparation functions (mixing, aliquoting, filtration) automatically without user intervention. The system self-regulates liquid volumes and timing, eliminating the need for users to perform manual processing steps while maintaining improved accuracy and sensitivity
Solution Approach 2:
The device divides the testing process into separate automated functional modules: sample input, mixing chamber, filtration layer, and assay interface. This segmentation allows complex functions to be performed automatically while presenting a simple interface to the user
2Measurement precision
If multiple manual processing steps are required, then detection precision improves, but ease of operation deteriorates significantly
Solution Approach 1:
The device automatically performs all processing steps including precise liquid measurement, mixing, and filtration without requiring user actions. The system self-regulates timing and volumes, maintaining high detection precision while preserving ease of use through a simple sample-in-result-out interface
Solution Approach 2:
An automated processing chamber acts as an intermediary between sample input and assay detection. This intermediary handles all complex operations (aliquoting, mixing, filtration) internally, shielding the user from complexity while enabling precise detection
3Device complexity
If conventional technology is used, then device simplicity is maintained, but inherent weaknesses like hematocrit variability and flow inconsistencies cannot be overcome
Solution Approach 1:
The device automatically compensates for hematocrit variability through self-regulating filtration and aliquoting mechanisms. The system adjusts liquid volumes and flow rates automatically based on sample characteristics, maintaining flow consistency without adding user-facing complexity
Solution Approach 2:
The device dynamically adjusts physical parameters (liquid volume, flow rate, filtration pressure) to compensate for sample variability. These parameter changes occur automatically within the device, preserving simplicity while improving reliability
4Extent of automation
If automated aliquoting and passive extraction are implemented, then user intervention is reduced, but device complexity increases
Solution Approach 1:
The device uses passive capillary action and self-regulating mechanisms to perform automated aliquoting and extraction without active pumping or complex control systems. The system leverages natural physical forces (capillarity, pressure gradients) to achieve automation while minimizing mechanical complexity
Solution Approach 2:
The device employs passive hydraulic principles (capillary pressure, pressure gradients) to drive automated liquid handling. Natural fluid dynamics replace active pumping mechanisms, achieving high automation levels with simplified device architecture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the testing process, reduces user intervention, improves accuracy and sensitivity, and allows for quantitative analysis, overcoming hematocrit variability and flow inconsistencies, thereby expanding the diagnostic capabilities of lateral flow assays.
Implementation Method 1
This technology makes use of a soluble matrix that has a high enough capillarity, or capillary drawing force, to draw liquid through a hydrophilic membrane or filter under passive capillary forces
Implementation Method 2
thereby eliminating the membrane's inherent breakthrough pressure, and that then dissolves or disintegrates in the extracted liquid and releases the liquid into a new geometry that has lower or less capillarity
Implementation Method 3
The sample pad may be or include a filtration membrane, which separates the filtrate from a retentate contained in a liquid sample applied to the sample pad
Data Source
AI summary
Disclosed are methods and devices for interfacing to or interacting with the flow of liquid passing into or through lateral-flow assays and related paper- or membrane-based in-vitro diagnostic testing platforms. This is done for the purpose of improving their performance, sensitivity, accuracy, repeatability, degree of multiplexing, and/or level of quantitation, and/or reducing their inherent limitations while maintaining, in large part, their simplicity, cost effectiveness, and ease of use. New methods are disclosed for pre-sample purification, aliquoting, sequential liquid delivery, flow control and other functions that are largely automatic and require no action on the part of the user.