Sensor Age Detection via Electrochemical Impedance Spectroscopy
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Solution Overview
Problem
Current continuous glucose monitoring systems face challenges in sensor stabilization time, electrode hydration, and determining the end of a sensor's specified life, leading to inaccurate readings and potential misuse beyond recommended operating life.
Innovation Solution
The method involves performing an Electrochemical Impedance Spectroscopy (EIS) procedure between sensor electrodes to calculate impedance values, compare them against thresholds, and use these measurements to determine if the sensor is ready for use, hydrated, or has aged beyond its specified life, thereby facilitating faster stabilization, ensuring accurate readings, and preventing extended use beyond the recommended lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sensor is inserted immediately into the patient's skin, then the sensor can be deployed quickly, but the sensor requires several hours of stabilization time before providing accurate readings
Solution Approach 1:
The sensor is pre-hydrated in a controlled environment before insertion into the patient's skin. This preliminary hydration action ensures that the electrode is already in a stable, conductive state when deployed, eliminating the need for several hours of stabilization time after insertion. The pre-hydrated sensor provides accurate readings immediately or within minutes of deployment.
2Duration of action of stationary object
If the sensor operates beyond the pre-set operating life, then the sensor can be used longer, but the sensor readings become less consistent and less reliable
Solution Approach 1:
The system continuously monitors sensor performance parameters such as impedance, signal quality, and reading consistency throughout the sensor's operational life. When degradation is detected or the pre-set operating life is approached, the system provides feedback warnings to the user and automatically disables further operation. This feedback mechanism prevents usage beyond the reliable operating period, ensuring consistent and accurate readings throughout the sensor's lifecycle.
3Ease of operation
If manual monitoring of sensor stabilization is required, then the patient can control when to power on the sensor, but the patient may forget to apply or turn on the power source
Solution Approach 1:
The sensor system automatically detects its own hydration status and stabilization completion without requiring manual patient monitoring. The sensor self-activates or provides clear automated indicators when ready for use, eliminating the burden on patients to remember to power on the sensor. This self-service capability ensures reliable activation while maintaining patient convenience.
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 reduces sensor stabilization time, ensures accurate glucose readings by verifying electrode hydration, and effectively prevents the misuse of sensors beyond their recommended life by detecting age-related degradation, thereby enhancing user safety and monitoring reliability.
Implementation Method 1
performing an EIS (Electrochemical Impedance Spectroscopy) procedure between at least two electrodes of the sensor and calculating an impedance value therefrom
Data Source
AI summary
A method and program prevents a user from bypassing a limit placed on a specified operating life of a sensor by disconnecting and reconnecting the sensor. The present invention checks a characteristic of the sensor to see if the sensor is used prior to the connection of the sensor, and rejects the sensor if the sensor is determined to have been used before. The process of checking the characteristic of the sensor involves performing an Electrochemical Impedance Spectroscopy (EIS) procedure and calculating an impedance value. The impedance value can be compared to various threshold values for a variety of purposes including the determination of age, condition, hydration, and stabilization of the sensor.