Dual-Reagent Electrochemical Sensor for Haematocrit Error Correction
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Solution Overview
Problem
Existing electrochemical test devices for measuring analyte concentrations in bodily fluids, such as glucose in blood, face challenges in achieving accurate measurements due to manufacturing variations and systematic errors like haematocrit variations, which affect the precision and reliability of results.
Innovation Solution
The method employs a test device with two analyte reagents having different time-based response characteristics, one rapidly dissolving and the other more progressive, to generate signals that can be used to correct for systematic errors and maximize precision by using algorithms that combine the signals from both reagents, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single analyte reagent is used in the test device, then the device structure is simple, but measurement accuracy is reduced due to manufacturing variations and systematic errors
Solution Approach 1:
The test device is segmented into multiple working electrodes (at least two), each coated with analyte reagent having different dissolution rates. This segmentation allows independent measurement channels that can be combined to cancel out systematic errors and manufacturing variations, thereby improving measurement accuracy while maintaining a relatively simple overall device structure.
2Speed
If analyte reagent dissolves rapidly, then the response time is short, but systematic sample errors like haematocrit effects are not adequately corrected
Solution Approach 1:
The invention changes the dissolution rate parameter of the analyte reagent by providing at least two different dissolution rates. This allows one reagent to provide rapid initial response while another provides slower, more stable signal less affected by haematocrit variations. The combined signal from both reagents achieves both fast response and accuracy.
3Measurement precision
If analyte reagent dissolves slowly, then systematic sample errors are better corrected, but the response time increases and manufacturing variations have greater impact
Solution Approach 1:
The invention merges the signals from multiple analyte reagents with different dissolution rates. The fast-dissolving reagent provides rapid initial signal that reduces response time, while the slow-dissolving reagent provides stable long-term signal that corrects systematic errors. By combining these signals, the device achieves both fast response and high accuracy.
4Measurement precision
If multiple working electrodes with different reagents are used, then measurement accuracy is improved through error correction, but the device complexity increases
Solution Approach 1:
The invention applies local quality by coating different working electrodes with analyte reagent having specifically different dissolution rates. Each electrode has a tailored local property (dissolution rate) that contributes to the overall measurement accuracy. This localized differentiation allows error correction without requiring complete redesign of the entire device architecture.
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 enhances the accuracy of analyte measurements by minimizing errors from manufacturing variations and haematocrit variations, leading to more reliable and precise results.
Implementation Method 1
The first and second analyte reagents solvate differently when brought into contact with the sample, thereby producing analyte-dependent signals with different current vs time characteristics
Implementation Method 2
Through capillary action, the sample flows across a measurement chamber of the device and into contact with one or more electrodes or similar conductive elements
Implementation Method 3
The diagnostic meter may detect the current generated by the reaction of the reagent with the analyte
Data Source
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AI summary
A test device for measuring the amount of analyte in a fluid sample, comprising a substrate having thereon: a first analyte reagent formulated to react with the analyte to generate a signal indicative of the presence or amount of analyte in the sample, the first analyte reagent having a first time-based response characteristic; and a second analyte reagent formulated to react with the analyte to generate a signal indicative of the presence or amount of analyte in the sample, the second analyte reagent having a second time-based response characteristic.