Fluidic Indicator Device Binary Assay via Flow Path Blocking
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Solution Overview
Problem
Non-digital assay devices, such as pregnancy-testing devices, provide assay results as variable strength signals, leading to potential misinterpretation, and existing optical/electronic binary outcome devices are complex and costly to produce.
Innovation Solution
A binary outcome assay device with a fluidic design featuring a test flow path and a reference flow path that intersect at a junction, where the first liquid to reach the junction blocks the other, simplifying production and eliminating the need for complex optical and electronic components, using microfluidic channels and porous carriers like nitrocellulose or filter paper to determine analyte presence with visible indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical and electronic components are used to provide binary outcome, then assay result clarity is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex optical and electronic reading systems with a simple fluidic mechanical system. Liquid flow through microchannels naturally provides binary outcomes based on flow path selection, eliminating the need for optical detectors, electronic displays, and power sources while maintaining clear readable results.
Solution Approach 2:
The fluidic system is self-regulating and self-displaying. The liquid flow automatically selects paths based on analyte presence and directly visualizes results through flow patterns, colors, or presence/absence of liquid in specific channels, requiring no external power source or electronic display components.
2Loss of information
If variable strength signal is provided, then assay information richness is improved, but user interpretation difficulty increases
Solution Approach 1:
Instead of providing continuous variable signals that require interpretation, the system inverts the approach by using discrete binary outcomes. The fluidic network is designed so that analyte presence or absence directly determines which flow paths are blocked or open, providing naturally binary results that are immediately interpretable without requiring user judgment about signal strength.
3Ease of operation
If binary outcome is provided, then user interpretation is simplified, but device simplicity is reduced
Solution Approach 1:
The patent extracts and removes all unnecessary optical, electronic, and power-related components from traditional assay devices. Only the essential fluidic network and sample application interface remain, creating a minimal device that provides binary outcomes through pure fluid dynamics without any complex subsystems.
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
The device provides a clear, binary outcome without requiring user interpretation, is simpler to manufacture than existing binary outcome devices, and effectively determines analyte presence with a 'race' mechanism between test and reference flow paths, ensuring accurate and straightforward results.
Implementation Method 1
The flow paths converge downstream at a junction region leading to a common channel... Liquid sample applied to the device via a sample application port in the sample application region is able to flow respectively along the test and reference flow paths
Data Source
AI summary
Disclosed is a fluidic assay device for assaying at least one property of a liquid sample, the device comprising:(i) a liquid sample application region;(ii) at least one test flow path in liquid flow communication with the sample application region;(iii) a reference flow path in liquid flow communication with the sample application region; and(iv) a junction region, at which the test flow path and the reference flow path contact one another, the junction region typically comprising an outlet, conduit, chamber or other portion which permits the onward flow of liquid;wherein a liquid flowing along the reference flow path, upon reaching the junction region, has the effect of preventing the flow of liquid along the test flow path.The invention relates to a fluidic device for the passage of a liquid. It also relates to an assay device suitable for measurement of the amount and/or presence of an analyte in, or property of, a fluid sample.