Biosensor Test Strip Parasitic Resistance Compensation
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Solution Overview
Problem
Existing biosensor test strips face issues with parasitic resistance in conductive traces, leading to inaccurate measurements and potential noise due to varying resistance and physical damage, which complicates the reliable determination of analyte concentrations in biological fluids.
Innovation Solution
Incorporation of counter sense and working sense electrodes with corresponding traces, along with advanced laser ablation techniques for precise pattern formation, allows for compensation of parasitic resistance and verification of trace integrity, ensuring accurate voltage application and measurement in the test strip's reaction zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional test strips are used without additional sense lines, then the device complexity is low, but measurement precision deteriorates due to parasitic resistance in conductive traces
Solution Approach 1:
The patent introduces counter sense and working sense lines as intermediary elements between the counter electrode and working electrode. These sense lines serve as mediators to measure and compensate for parasitic resistance in the trace connections, enabling accurate voltage application and current measurement without increasing overall device complexity significantly
Solution Approach 2:
The patent implements feedback by measuring the voltage drop across the parasitic resistance through the sense lines and using this information to compensate for the resistance effect. The test meter measures the actual voltage at the electrode interfaces by subtracting the parasitic resistance drop, creating a closed-loop feedback system that maintains measurement precision
2Manufacturing precision
If laser ablation is used for trace pattern formation, then manufacturing precision is improved, but the risk of trace damage and parasitic resistance increases
Solution Approach 1:
The patent applies preliminary action by forming the sense lines and counter sense lines during the same laser ablation process as the main electrode traces. This preliminary formation of additional conductive paths allows for subsequent compensation of any parasitic resistance without requiring separate manufacturing steps, maintaining both precision and reliability
3Reliability
If parasitic resistance is present in conductive traces, then device complexity remains low, but reliability deteriorates due to varying resistance and physical damage
Solution Approach 1:
The patent implements self-service by enabling the test strip to measure its own parasitic resistance through the sense lines. The system uses the test strip's own electrical characteristics to compensate for its own defects, eliminating the need for external calibration or complex compensation systems while improving reliability
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 solution enhances the accuracy of analyte concentration measurements by compensating for parasitic resistance and verifying trace integrity, reducing noise and ensuring reliable performance of biosensor test strips.
Implementation Method 1
advanced laser ablation techniques for precise pattern formation
Data Source
AI summary
The present invention provides a test strip for measuring a signal of interest in a biological fluid when the test strip is mated to an appropriate test meter, wherein the test strip and the test meter include structures to verify the integrity of the test strip traces, to measure the parasitic resistance of the test strip traces, and to provide compensation in the voltage applied to the test strip to account for parasitic resistive losses in the test strip traces.