Lateral Flow Assays Using 2D Reagent Dot Matrices
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Solution Overview
Problem
Lateral flow assays lack comprehensive control and calibration features, which can lead to variability in test results due to flow rate and pattern variations across the surface and length of the flow field.
Innovation Solution
A test device with a matrix of reagent dots that are spaced apart to prevent interference in liquid flow, allowing for the formation of detectable signals that provide flow control and internal calibration information, and optionally indicating the presence, absence, or amount of an analyte in a liquid sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional lateral flow assays use continuous reagent lines or overlapping features, then the device complexity is reduced and manufacturing is simplified, but flow control information is insufficient and internal calibration cannot be performed
Solution Approach 1:
The patent segments the continuous reagent line into discrete, spatially separated reagent dots arranged in a two-dimensional pattern. Each dot contains reagent and independently interacts with the liquid flow, enabling multiple control and calibration functions to be distributed across the device surface rather than relying on a single continuous feature.
Solution Approach 2:
The patent transitions from one-dimensional linear reagent arrangements to two-dimensional spatial patterns of reagent dots. This dimensional expansion allows simultaneous implementation of flow control dots, internal control dots, and calibration dots in distinct spatial locations, providing comprehensive control information without increasing linear device length.
2Measurement precision
If reagent dots are placed close together or overlapping, then the device area is minimized, but liquid flow to different reagent dots interferes with each other affecting measurement precision
Solution Approach 1:
The patent assigns different functional qualities to different regions of the device surface. Flow control dots are positioned in areas where liquid flow patterns can be monitored, internal control dots are placed where analyte interaction is expected, and calibration dots are located in regions optimized for signal generation. Each dot's location is optimized for its specific function while maintaining adequate spacing to prevent flow interference.
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 solution enables internal calibration and control within the test device, reducing variability in results and enhancing the accuracy of analyte detection by ensuring consistent flow and signal generation across the test surface.
Implementation Method 1
when a liquid flows laterally along the matrix, flow of the liquid to, through and/or around one of the two reagent dots does not substantially affect flow of the liquid sample to, through and/or around the other reagent dot
Implementation Method 2
transporting a labeled reagent to the at least two reagent dots; and assessing the presence, absence, amount and/or pattern of signal(s) generated by the labeled reagent
Data Source
AI summary
The present invention relates to novel lateral flow devices using two dimensional features, preferably, uniform two dimensional test and control features, to provide flow control information, to function as an internal control and/or to provide internal calibration information for the test device. The present invention also relates to methods for using the lateral flow devices to provide flow control information, to function as an internal control and/or to provide internal calibration information for the test device.