Glucose Sensor Enzyme Layer State Detection via Dual Voltage
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Solution Overview
Problem
Existing glucose sensors, both subcutaneous indwelling and non-indwelling types, face challenges in detecting the degradation of the enzyme reagent layer, which can occur independently of or prior to the outer layer film degradation, leading to inaccurate glucose concentration measurements.
Innovation Solution
A measuring apparatus and method that apply different voltages to detect the state of the enzyme reagent layer by measuring the difference in response current values, allowing for the determination of normal, pre-degraded, or degraded states of the enzyme reagent layer, regardless of the presence of an outer layer film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single voltage is applied to detect outer layer film degradation, then the detection of outer layer film defects is improved, but the detection of enzyme reagent layer degradation is lost
Solution Approach 1:
The detection process is segmented into two distinct voltage application stages: a first voltage for detecting outer layer film degradation and a second voltage for detecting enzyme reagent layer degradation. This segmentation allows each voltage to target specific degradation types independently, resolving the contradiction between detecting outer layer film defects and enzyme reagent layer defects.
Solution Approach 2:
The patent changes the voltage parameter from a single fixed value to multiple variable values. By applying different voltage magnitudes (first voltage and second voltage with different absolute values), the system can differentiate between outer layer film degradation and enzyme reagent layer degradation, thereby improving both detection accuracy and detection versatility.
2Adaptability or versatility
If different voltages are applied to detect enzyme reagent layer state, then the detection capability for enzyme reagent layer is improved, but the detection of outer layer film degradation may be compromised
Solution Approach 1:
The detection process is segmented into two distinct voltage application stages: a first voltage for detecting outer layer film degradation and a second voltage for detecting enzyme reagent layer degradation. This segmentation allows each voltage to target specific degradation types independently, resolving the contradiction between detecting outer layer film defects and enzyme reagent layer defects.
Solution Approach 2:
The patent changes the voltage parameter from a single fixed value to multiple variable values. By applying different voltage magnitudes (first voltage and second voltage with different absolute values), the system can differentiate between outer layer film degradation and enzyme reagent layer degradation, thereby improving both detection accuracy and detection versatility.
3Measurement precision
If only outer layer film degradation is detected, then the measurement accuracy for glucose concentration is maintained, but the overall sensor reliability is reduced
Solution Approach 1:
The system performs preliminary detection of both outer layer film degradation and enzyme reagent layer degradation before they affect glucose concentration measurements. By detecting enzyme reagent layer degradation early (which may occur before outer layer film degradation), the system can alert users to replace the sensor proactively, maintaining both measurement accuracy and overall reliability.
Solution Approach 2:
The patent implements a feedback mechanism where detection results from both voltage applications are analyzed to determine sensor health status. This feedback loop provides comprehensive information about sensor degradation states, enabling users to maintain reliable glucose monitoring by replacing sensors based on actual degradation detection rather than assuming outer layer film integrity.
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
Enables accurate detection of the enzyme reagent layer's state, enabling timely replacement and maintaining measurement accuracy by distinguishing between normal, pre-degraded, and degraded states, thereby addressing the limitations of existing detection techniques.
Implementation Method 1
an enzyme reagent layer is provided on a working electrode... a voltage for obtaining a response derived from a substrate is continuously applied to a sensor... change of a response current value
Data Source
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AI summary
[Object] To provide a measuring apparatus capable of detecting a state of an enzyme reagent layer provided in a sensor. [Means for Solution] A measuring apparatus for measuring a substrate concentration by using a sensor including an enzyme reagent layer includes: state detecting means that applies a first voltage and a second voltage different from the first voltage to the sensor to detect a state of the enzyme reagent layer based on a difference between a first response current value obtained under application of the first voltage and a second response current value obtained under application of the second voltage.