Compensation Electrode Analog Calibration for Glucose Sensor Accuracy
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Solution Overview
Problem
Existing electrochemical test sensors for blood glucose monitoring face inaccuracies due to manufacturing variances, requiring complex and costly calibration methods, such as independent calibration strips or limited calibration codes on test strips, which are time-consuming and inadequate for compensating for manufacturing tolerances.
Innovation Solution
The introduction of an analyte test sensor with a compensation electrode that adjusts the working current in an analog manner, using a resistive ladder to correct for manufacturing inaccuracies, allowing for batch testing and adjustment of resistance values to ensure accurate glucose readings without the need for digital calibration prior to each assay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If independent calibration strips or limited calibration codes are used to compensate for manufacturing variances, then measurement precision is improved, but device complexity and ease of operation deteriorate due to time-consuming calibration procedures
Solution Approach 1:
The patent extracts the calibration function from a separate calibration strip or digital calibration routine and integrates it directly into the test sensor itself through the compensation electrode. This eliminates the need for separate calibration operations while maintaining measurement precision by compensating for manufacturing variances at the sensor level.
Solution Approach 2:
The test sensor performs self-calibration through the compensation electrode, which automatically compensates for manufacturing variances without requiring external calibration strips or user intervention. The sensor calibrates itself by measuring its own characteristics and adjusting accordingly, improving ease of operation while maintaining precision.
2Measurement precision
If independent calibration strips or digital calibration codes are used, then measurement precision is improved, but loss of time increases due to calibration procedures required before each assay
Solution Approach 1:
The compensation electrode is pre-configured during manufacturing to provide automatic compensation for typical manufacturing variances. This preliminary setup eliminates the need for time-consuming calibration procedures before each assay, as the sensor is already prepared to compensate for its specific manufacturing characteristics.
Solution Approach 2:
The sensor performs automatic self-calibration through the compensation electrode without requiring user intervention or separate calibration strips. This self-service calibration occurs seamlessly during normal operation, eliminating time loss while maintaining measurement precision.
3Ease of manufacture
If manufacturing tolerances are relaxed to reduce costs, then ease of manufacture is improved, but measurement precision deteriorates due to increased manufacturing variances
Solution Approach 1:
The patent introduces a compensation electrode with adjustable resistance that can be tuned to compensate for manufacturing variances. By changing the resistance parameter of the compensation electrode, the system can correct for variations in electrode dimensions, enzyme loading, and other manufacturing parameters, allowing relaxed tolerances while maintaining precision.
Solution Approach 2:
The compensation electrode provides feedback about manufacturing variances and automatically adjusts the measurement signal to compensate. This feedback mechanism allows the system to maintain measurement precision even when manufacturing tolerances are relaxed, as the compensation electrode detects and corrects for deviations from ideal conditions.
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 simplifies the calibration process, reduces manufacturing costs, and provides a more accurate measurement of glucose levels by directly correcting for manufacturing variances in an analog manner, eliminating the need for separate calibration strips and accommodating a larger number of calibration codes.
Implementation Method 1
The compensation electrode is designed to correct test result inaccuracies which are the result of variances in the manufacturing of the analyte test sensor
Implementation Method 2
an enzyme is applied onto the first end of the working electrode. When exposed to the enzyme, glucose present in a blood sample undergoes a chemical reaction which produces a measurable electrical response (i.e., a current)
Data Source
AI summary
An analyte test sensor for use in measuring the concentration of a particular analyte in a test sample includes a non-conductive substrate, a reference electrode deposited on the substrate, a working electrode deposited on the substrate and a compensation electrode deposited on the substrate. The compensation electrode is provided with a resistive ladder and is designed to correct for test result inaccuracies which are the result of variances in the manufacturing of the test sensor. Specifically, in one embodiment, the compensation electrode corrects for test result inaccuracies in an analog manner by shunting a portion of the working current away from working electrode. In another embodiment, the compensation electrode corrects for test result inaccuracies in a digital manner by providing a calibration code which is proportional its resistance value. A batch of analyte test sensors are preferably manufactured in the following manner. An initial batch of the test sensors is constructed. Then, a limited sampling of the sensors is tested for accuracy using a control sample. Based on the test results, the resistance value of the compensation electrode for each remaining sensor in the batch is adjusted accordingly.