Differential Measurement Channels for Assay Sensitivity
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Solution Overview
Problem
Current assays for detecting analytes in biological or chemical samples rely on human judgment or expensive high-resolution imaging systems, leading to inconsistent and error-prone results, and there is a need for a simple and inexpensive method to determine the presence and quantity of analytes.
Innovation Solution
A method and system that utilize a test strip with multiple channels containing reagent portions, where a test sample and control samples with known analyte amounts are used to measure light levels, allowing for calibration and determination of analyte presence and quantity through a photodetector array and processor, forming calibration curves to accurately assess test analyte levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If human eye observation is used to read assays, then the system is simple and inexpensive, but the readings are inconsistent and error-prone
Solution Approach 1:
The patent replaces the mechanical/optical system of human eye observation with an electronic imaging system (CCD camera) that captures images of the assay. This substitution maintains simplicity and low cost while dramatically improving measurement precision and consistency, as the digital imaging system provides objective, repeatable readings without human variability.
2Measurement precision
If high-resolution imaging equipment is used to read assays, then measurement precision is improved, but the equipment cost increases significantly
Solution Approach 1:
The patent employs a disposable assay device with integrated optical features (sensitive regions with different reflectivity or fluorescence properties) that can be read by inexpensive imaging equipment. The assay design itself encodes the measurement information in a way that can be captured by low-cost cameras, eliminating the need for expensive specialized instrumentation while maintaining detection accuracy.
Solution Approach 2:
The patent utilizes optical property changes (reflectivity, fluorescence) of the sensitive regions in response to analyte binding. These optical changes are detected by inexpensive imaging systems, allowing accurate analyte quantification without requiring costly high-resolution imaging equipment. The optical contrast provides sufficient signal for precise measurement using affordable cameras.
3Device complexity
If a single channel assay is used, then the device is simple, but sensitivity and measurement reliability are limited
Solution Approach 1:
The patent divides the assay into multiple parallel channels, each containing sensitive regions that respond to the analyte. This segmentation allows simultaneous measurement in multiple channels, improving statistical reliability and sensitivity through differential measurement while maintaining a relatively simple overall device structure. The multi-channel approach enables comparison and calibration that enhances measurement confidence.
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 provides a cost-effective and reliable method for determining the presence and quantity of analytes in samples, reducing human error and the need for expensive equipment by using calibrated light measurements and control samples to accurately assess test analyte levels.
Implementation Method 1
If a reaction has occurred, some of the incident light is reflected from the bonded material
Implementation Method 2
If a reaction has occurred, the bonded material fluoresces upon exposure to the incident light
Implementation Method 3
measuring at least one test-light level responsive to reactions of at least one reagent group and at least one reactive test analyte
Data Source
AI summary
A method to calibrate measurements of a test analyte in a test sample including measuring at least one test-light level responsive to reactions of at least one reagent group and at least one reactive test analyte in the test sample and measuring at least one control-light level responsive to reactions of at least one reagent group and at least one control analyte in a control sample. Each control analyte is a known amount of at least one reactive test analyte. The method further includes determining a presence of the reactive test analyte in the test sample based on the measured test-light levels and control-light levels. The reagent group and the reactive test analyte react by attaching to each other.