Glucose Sensor EIS Compensation for Agent Elution Drift
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Solution Overview
Problem
Existing glucose sensors suffer from performance deterioration and inaccuracy due to corrosion and chemical deposits on the working electrode, leading to potential user risks if continuously used.
Innovation Solution
A method and system that compensates for agent elution by using electrochemical impedance spectroscopy (EIS) to calculate agent concentration and adjust sensor glucose values, employing agents like dexamethasone or siRNA to extend sensor life and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a working electrode is continuously used for glucose monitoring, then the sensor can provide continuous measurements, but the working electrode becomes corroded and chemicals are deposited on it, causing performance deterioration and measurement inaccuracy
Solution Approach 1:
An agent layer is introduced as an intermediary between the working electrode and the biological environment. This agent layer reduces the direct interaction between the electrode surface and corrosive bodily fluids, thereby extending sensor lifetime while maintaining measurement accuracy through controlled agent elution that prevents harmful deposits
Solution Approach 2:
The sensor system monitors changes in electrochemical impedance spectroscopy (EIS) parameters to detect agent elution and performance degradation. By tracking EIS value changes over time, the system can identify when the agent layer is depleting and adjust or replace the sensor accordingly, optimizing both lifetime and accuracy
2Duration of action of stationary object
If an agent is applied to extend sensor lifetime, then the sensor can operate longer in the body, but the elution of the agent may affect measurement accuracy
Solution Approach 1:
The system continuously monitors EIS parameters to detect agent elution in real-time. When agent elution is detected and determines that it affects measurements, the system compensates by adjusting the glucose measurement calculations or triggering a sensor replacement alert, thereby maintaining measurement reliability throughout the extended sensor lifetime
Solution Approach 2:
The agent is applied in excess to ensure sufficient coverage and prolonged sensor lifetime. The system accepts that some agent elution will occur but manages its impact through monitoring and compensation strategies, allowing the sensor to operate beyond typical lifetime limits while maintaining acceptable measurement 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
Extends the lifetime of glucose sensors by adjusting sensor readings to maintain accuracy, reducing user risk and improving measurement reliability.
Implementation Method 1
oxidation and reduction occur repeatedly around the working electrode
Implementation Method 2
electrochemical impedance spectroscopy (EIS) to calculate agent concentration and adjust sensor glucose values
Data Source
AI summary
A method for compensating for a life-lengthening agent for a glucose sensor includes accessing first and second electrochemical impedance spectroscopy (EIS) values of at least one parameter based on first and second EIS procedures performed on EIS signals from a working electrode of the glucose sensor, calculating a change in the at least one parameter between the first and second EIS values, estimating a concentration of the agent based on the change in the at least one parameter, and calculating a model effect in response to the concentration. In a case where the model effect is not greater than the threshold, the method further includes adjusting a sensor glucose value based on the concentration and sensor signals from the working electrode, and displaying the adjusted sensor glucose value.