Artificial Test Strip Controls for Linearity Calibration
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Solution Overview
Problem
Point-of-care and home testing technologies face challenges in ensuring the proper functioning of test strip systems, particularly in achieving linearity and accuracy across various analytes, as existing methods may not account for differences between serum and whole blood, leading to inconsistent results and stability issues with linearity materials.
Innovation Solution
A system utilizing a calibration solution, such as potassium ferricyanide, that interacts specifically with chromophores in test strips, allowing for linearity testing and troubleshooting without relying on enzyme reactions, and providing a stable alternative for both optical and electrochemical assays, enabling precise measurement and adjustment of meter calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enzyme reactions are used for linearity testing in test strips, then the testing can reflect physiological conditions, but the results show imprecision and inconsistency
Solution Approach 1:
The patent introduces an artificial chromogen as an intermediary substance that directly reacts with the test strip's chromophores without involving enzyme reactions. This mediator substance (potassium ferricyanide) provides a controlled, predictable reaction that eliminates the variability inherent in enzyme-based systems, thereby improving measurement precision while maintaining reliability of the linearity assessment
Solution Approach 2:
The patent changes the fundamental reaction parameter from enzyme-catalyzed to direct chemical reaction. By substituting the biological enzyme mechanism with a direct redox reaction between potassium ferricyanide and the chromophore, the system achieves more consistent and precise measurements while eliminating the imprecision associated with enzyme variability
2Reliability
If serum-based linearity materials are used, then the testing reflects clinical sample conditions, but the materials show stability issues
Solution Approach 1:
The patent employs a stable, non-biological substance (potassium ferricyanide) that can be stored indefinitely without degradation. This replaces the short-lived, unstable serum-based materials that require special handling and have limited shelf life, thereby achieving both clinical relevance and long-term stability
Solution Approach 2:
The patent extracts the essential testing function from the complex serum matrix by using a simplified artificial chromogen system. This extraction removes the instability factors inherent in biological samples while preserving the core functionality of linearity testing, achieving stability without sacrificing clinical relevance
3Adaptability or versatility
If calibration solutions interact with separation layers in test strips, then comprehensive testing is achieved, but the calibration accuracy is reduced
Solution Approach 1:
The artificial chromogen acts as a selective intermediary that bypasses the separation layers and interacts only with the chromophores in the reaction zone. This targeted interaction ensures that calibration accuracy is maintained by eliminating confounding variables from separation layer interactions, while still providing comprehensive testing of the analytical function
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 precise and stable linearity testing, eliminating imprecision from enzyme reactions, ensuring accurate optics and amperometric checks across the dynamic range, and offering a fast and reliable method for identifying functional and non-functional test strip portions, with potassium ferricyanide solutions demonstrating consistent results across varying concentrations.
Implementation Method 1
a calibration solution, such as potassium ferricyanide, that interacts specifically with chromophores in test strips
Implementation Method 2
optical and electrochemical test strips are used for testing purposes
Implementation Method 3
The calibration solution is ferrocyanide, and a mediator in the test strip is potassium ferricyanide
Data Source
AI summary
A linearity standard includes a plurality of calibration solutions, each calibration solution having a different level of a reactant having a known response in a test strip and meter combination, and an electronic storage medium for storing calibration instructions and known responses for each solution of the plurality of calibration solutions.