Analyte Sensor Protective Layer Layout for Low-ESR Signal Detection
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Solution Overview
Problem
Existing analyte sensors face challenges with increased measured equivalent series resistance (ESR) due to protective coatings that minimize electrode surface area, leading to reduced signal resolution and prolonged running-in periods, and are sensitive to variations in temperature and mechanical load.
Innovation Solution
An analyte sensor design featuring a substrate with a working electrode and a conductive layer, partially covered by a silver layer and a protective layer with controlled access holes, allowing for efficient electrochemical reactions while minimizing overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective coating is applied to isolate the electrode surface area, then the sensor stability is improved, but the measured equivalent series resistance increases and signal resolution decreases
Solution Approach 1:
The patent applies protective coating selectively to specific regions of the electrode rather than uniformly across the entire surface. The coating is applied to areas not required for electrochemical reactions, while leaving reaction-active areas exposed. This localized application maintains sensor stability through protection where needed while preserving signal resolution by keeping reactive surfaces accessible.
Solution Approach 2:
The electrode surface is divided into functionally distinct zones: coated regions for stability and uncoated regions for electrochemical activity. This segmentation allows the protective coating to stabilize the sensor structure without interfering with the electrochemical reactions that generate the measurement signal, thereby resolving the contradiction between stability and signal resolution.
2Area of stationary object
If the electrode surface area is minimized, then the sensor size is reduced, but the measured equivalent series resistance increases and running-in period is prolonged
Solution Approach 1:
The patent creates heterogeneous regions on the electrode surface with different properties: coated areas provide structural stability and define the compact sensor geometry, while uncoated areas provide sufficient electrochemical reaction surface area. This ensures the sensor remains compact while maintaining adequate active surface area to reduce the running-in period.
3Area of stationary object
If the electrode surface area is minimized, then the sensor size is reduced, but the sensitivity to temperature and mechanical load variations increases
Solution Approach 1:
The selective coating strategy creates regions with different environmental responses. The coated areas provide mechanical stability and protect against environmental variations, while the uncoated reactive areas maintain electrochemical performance. This differential protection reduces overall sensitivity to temperature and mechanical load variations while keeping the sensor compact.
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
The design enhances signal resolution and reduces sensitivity to environmental factors, enabling faster and more accurate analyte detection with a compact sensor structure.
Implementation Method 1
an analyte sensor for determining at least one analyte... electrochemical analyte sensors for measuring glucose
Implementation Method 2
a protective layer, which comprises at least one electrically conductive material
Data Source
AI summary
An analyte sensor for determining at least one analyte and a method for producing an analyte sensor are disclosed. The analyte sensor comprises:a substrate;a working electrode and a conductive layer located on different sites on the substrate;a silver comprising layer partially covering the conductive layer; anda protective layer, whichcomprises at least one electrically conductive material; andcovers the silver comprising layer apart from at least one at least one hole that provides access for at least one body fluid comprising the at least one analyte to the silver comprising layer.Although the analyte sensor as disclosed herein has a reduced overall size, sufficient space is, nevertheless, provided for the silver comprising layer coated by the protective layer while, concurrently, further sufficient space remains which is neither coated by the silver comprising layer nor by the protective layer.