Spatiotemporal Assay Analysis for Rapid Immunochromatography
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Solution Overview
Problem
Rapid immunochromatographic assay devices lack reliability and quantitation capabilities due to variable flow dynamics and inability to precisely control assay conditions, resulting in inferior results compared to laboratory-based systems.
Innovation Solution
A method and device utilizing spatiotemporal measurements during the assay reaction, where a membrane strip with test particles and capture reagents is used, and digital images are captured to record the movement and binding of particles, allowing for analysis of flow dynamics and analyte concentration through spatiotemporal datasets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rapid immunochromatographic assay devices are used for on-site testing, then ease of operation and speed are improved, but reliability and measurement precision deteriorate due to variable flow dynamics
Solution Approach 1:
The patent implements feedback by capturing multiple images at different time points during the assay reaction and using image analysis software to calculate flow dynamics parameters. The system continuously monitors particle movement and provides real-time feedback on flow characteristics, allowing for dynamic adjustment and compensation of variable flow conditions to improve test reliability
Solution Approach 2:
The patent replaces subjective visual interpretation with automated digital image analysis. The imaging system captures optical signals, and software algorithms automatically analyze particle movement patterns, calculate flow dynamics parameters, and determine analyte concentrations, eliminating human subjectivity and improving measurement precision
2Ease of operation
If rapid immunochromatographic assay devices are used, then ease of operation is improved, but measurement precision and quantitation capabilities worsen
Solution Approach 1:
The patent replaces manual visual assessment with automated digital image analysis software that objectively measures particle movement, calculates flow dynamics parameters, and determines analyte concentrations. This substitution of mechanical/optical measurement systems with computational analysis eliminates human subjectivity and enables precise quantitation
Solution Approach 2:
The patent transforms the assay output from simple visual band presence/absence to quantitative measurements by analyzing multiple parameters including particle migration distance, velocity, acceleration, and temporal patterns. This parameter transformation enables precise quantitation of analyte concentrations
3Ease of operation
If visual interpretation of band formation is used, then ease of operation is improved, but loss of information increases due to disregard of interim discolored state
Solution Approach 1:
The patent implements continuous imaging throughout the entire assay reaction process, capturing images at multiple time points from initial sample application through completion. This continuous monitoring preserves all intermediate states and discoloration patterns that would otherwise be missed, eliminating information loss while maintaining operational simplicity
Solution Approach 2:
The patent introduces digital imaging technology as an intermediary between the assay reaction and result interpretation. The imaging system acts as a mediator that captures and preserves all intermediate states, allowing comprehensive analysis of the entire reaction process without requiring complex user intervention
4Reliability
If laboratory-based immunoassays are used, then reliability and measurement precision are improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent implements self-service by enabling the rapid assay device to automatically perform functions previously requiring complex laboratory equipment. The integrated imaging system and analysis software allow the device to autonomously capture images, analyze flow dynamics, calculate parameters, and determine results without sophisticated external instrumentation or highly trained personnel
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
Enables reliable and quantitative determination of analytes in fluid samples by accounting for flow dynamics and binding interactions, providing results comparable to laboratory-based systems while being performed on-site.
Implementation Method 1
capillary action of fluid to transport the analyte, if analyte is present in the sample, through the application region to the particle region
Implementation Method 2
the analyte binds to any analyte binding reagent coated on the test particles imbedded in the particle region
Implementation Method 3
Test particles, including those which are bound with analyte, are mobilized by sample fluid and move by capillary action through the pre-capture zone of the strip to the capture zone
Implementation Method 4
The capture reagent interacts with analyte-bound test particles, analog-bound test particles or analyte-free antibody-bound test particles, depending on the nature of the assay (i.e. sandwich or competitive); binding interactions between the capture reagent and the test particles result in arrest of test particles in the capture zone
Data Source
AI summary
The invention relates to methods of reliably and quantitatively determining the amount of an analyte of interest in a fluid sample using a flow-induced assay, such as an immunochromatographic assay, in which spatiotemporal measurements are recorded during the course of the assay reaction, generating a spatiotemporal dataset, and subsequently analyzed. The invention also relates to a system incorporating instruments for recording spatiotemporal datasets (spatiotemporal data recorders), devices comprised of flow-induced assays configured for analysis on a spatiotemporal recorder, and programs for analyzing the recorded spatiotemporal datasets.