Assay Device Dual-Threshold Control Signal Validation
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Solution Overview
Problem
Existing assay devices face limitations in detecting analytes at higher concentrations due to the 'hook effect' and limited assay range, which restricts their ability to provide accurate results over an extended concentration range, especially for small molecules like haptens.
Innovation Solution
An assay device with a dual-control threshold system that compares control signals at different times during the assay, allowing for early result provision if the signal exceeds the first threshold and confirming assay validity with a second threshold, thereby extending the dynamic range and improving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sandwich immunoassay is used for analyte detection, then sensitivity is improved, but the assay range is limited due to the hook effect at higher analyte levels
Solution Approach 1:
The patent implements dynamic control threshold adjustment based on timing. The system transitions from a first control threshold at an early time point t1 to a second control threshold at a later time point t2. This dynamic adaptation allows the assay to accommodate varying signal intensities across different analyte concentrations, effectively extending the measurable range while maintaining sensitivity through timed threshold comparisons
2Device complexity
If a single control threshold is used for assay validation, then the validation process is simple, but incorrect validation may occur at higher analyte levels due to signal variations
Solution Approach 1:
The patent segments the control validation process into two distinct temporal stages with different thresholds. The first control threshold operates at time point t1 for early validation, while the second control threshold operates at time point t2 for confirmation. This segmentation allows each threshold to be optimized for its specific time window, improving validation accuracy across the full assay range while maintaining manageable complexity through a systematic two-stage approach
3Productivity
If early result provision is enabled, then productivity is improved, but risk of incorrect validation increases without proper control mechanisms
Solution Approach 1:
The patent performs preliminary control validation at the first time point t1 using the first control threshold before final result delivery. This preliminary check allows early provision of results for samples that clearly meet validation criteria, while simultaneously maintaining reliability by having a second validation stage ready for samples that require confirmation. The preliminary action enables productivity gains without sacrificing accuracy through the staged validation approach
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 enables accurate detection of analytes over a broader concentration range, reducing the likelihood of incorrect assay validation and providing reliable results even at higher analyte levels, thus overcoming the limitations of traditional sandwich immunoassays.
Implementation Method 1
a labelled binding reagent capable of binding to the analyte in question
Implementation Method 2
an immobilised binding reagent also capable of binding to the analyte provided at a detection zone
Implementation Method 3
an optical detection means wherein said assay measures signals from an analyte measurement zone
Data Source
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AI summary
Disclosed is an assay result reading apparatus, for reading the result of an assay, comprising: a)first and second control thresholds; b)a data processing means for processing an analyte measurement signal indicative of the presence and/or amount of an analyte; and for processing a control signal indicative of whether the assay has been carried out satisfactorily; to: up until a time t1 after commencement of the assay measurement, to compare the control signal with the first control threshold and determine that the assay has been carried out satisfactorily if the control signal exceeds or is equal to the first control threshold, and if the control signal is less than the first control threshold to continue the assay measurement; and at a time t > t1 to compare the control signal with a second control threshold and provide an assay result if the control signal exceeds or is equal to the second control threshold.