Biosensor Conductive Trace Compensation for Uncompensated Resistance
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Solution Overview
Problem
Biosensors used for electrochemical analyte measurements in body fluids face inaccuracies due to uncompensated resistances in their conductive elements, which affect the accuracy and reliability of analyte concentration measurements.
Innovation Solution
The method involves segmenting conductive elements into theoretical 'squares' to calculate sheet resistance and uncompensated resistance, allowing for precise compensation and correction of impedance measurements by subtracting uncompensated resistance from measured impedance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage compensation is applied to counteract IR drop in conductive elements, then measurement accuracy is improved, but uncompensated resistance remains in regions beyond compensation loops
Solution Approach 1:
The conductive elements are segmented into multiple discrete sections with individually controllable potentials. This allows the system to apply compensation voltage to specific segments where IR drop occurs, while maintaining accurate potential control at the reaction zone without affecting other regions. The segmentation enables precise localization of compensation effects.
Solution Approach 2:
Different regions of the conductive elements are assigned different electrical potentials to achieve optimal local conditions. The reaction zone maintains its required potential for accurate measurement, while intermediate conductive regions receive compensating potentials to offset IR drop. This local differentiation resolves the contradiction by treating each region according to its specific functional requirements.
2Measurement precision
If conductive trace resistance is reduced by using highly conductive materials or wider/thicker traces, then measurement accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The system changes the electrical parameters (potential and current) of the measurement system to compensate for the inherent resistance of the conductive elements. By adjusting the applied potential and measuring the resulting current, the system calculates and compensates for IR drop effects mathematically, avoiding the need to physically modify the conductive trace geometry or materials.
Solution Approach 2:
The patent replaces physical/mechanical solutions (changing trace width, thickness, or material) with an electrical/software-based solution. The system uses electronic potential control and computational algorithms to compensate for resistance effects, substituting complex manufacturing requirements with controllable electrical parameters and data processing.
3Device complexity
If conventional two-electrode measurement is used, then device simplicity is maintained, but uncompensated resistance causes measurement errors
Solution Approach 1:
The measurement system dynamically adjusts the potential applied to different conductive elements based on real-time current measurements and calculated IR drop values. This dynamic compensation allows the simple two-electrode configuration to achieve accuracy comparable to more complex systems by continuously adapting the measurement parameters.
Solution Approach 2:
The system implements feedback by measuring the actual current through the conductive elements, calculating the IR drop, and using this information to compensate for measurement errors. The feedback loop enables the simple two-electrode system to correct its own measurement inaccuracies without requiring additional hardware complexity.
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 and reliability of analyte concentration measurements by minimizing errors caused by uncompensated resistances, improving the precision of biosensor readings.
Implementation Method 1
When a voltage is applied by the measurement device, an electrochemical reaction can take place in the presence of a sample having an analyte of interest
Implementation Method 2
the resistance of the conductive traces that connect the reaction zone to the electronic circuitry in the test meter can measure several hundred ohms (Ω) or more. This resistance causes a potential drop along the length of the traces
Implementation Method 3
The measurement device 102 can compute impedance (Z) of a load or a cell by V1/ILOOP
Data Source
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AI summary
Methods are provided for correcting for effects of uncompensated resistances in conductive elements of biosensors during electrochemical analyte measurements, where such methods include theoretically segmenting areas of conductive elements of biosensors into a number of conductive "squares," respectively, and using this information to calculate or determine sheet resistance of a biosensor's conductive elements in Ω/square at a time of use by measuring resistance of one or more paths or patterns of the conductive elements and then dividing by a theoretical number of uncompensated conductive squares in the path or pattern of conductive elements to obtain one or more uncompensated resistance values. Measurement errors can be compensated, corrected and/or minimized by subtracting uncompensated resistances from a real portion of a measured impedance.