Carbon-Enzyme Working Electrode for Lower-Cost CGM Accuracy
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Solution Overview
Problem
Current continuous glucose monitoring (CGM) systems are costly and inconvenient for patients, leading to suboptimal glucose level monitoring due to the need for frequent replacement of disposable sensors and the pain associated with traditional finger prick methods, which can result in incorrect health decisions and increased risk of diabetes-related complications.
Innovation Solution
A novel working electrode design for CGM systems using a plastic substrate coated with a carbon-containing compound, combined with a novel interference layer and glucose limiting layer, eliminates the need for expensive platinum and enhances sensitivity and accuracy, allowing for a more durable, flexible, and cost-effective sensor solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional platinum-based working electrodes are used in CGM systems, then measurement precision and reliability are improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent changes the material parameter of the working electrode from traditional platinum to carbon-based materials (such as carbon ink, carbon paste, or carbon-coated substrates). This parameter substitution maintains the electrochemical functionality for glucose detection while dramatically reducing manufacturing costs, as carbon materials are abundant and easier to process than platinum.
Solution Approach 2:
The patent employs composite material structures where carbon-based materials are combined with enzymes (such as glucose oxidase) and mediators to create a functional working electrode. This composite approach enables the carbon material to achieve the catalytic and electrochemical properties traditionally associated with platinum, thereby reducing cost while maintaining measurement precision.
2Measurement precision
If disposable CGM sensors are replaced frequently to maintain monitoring accuracy, then measurement precision is improved, but loss of time and patient convenience deteriorate
Solution Approach 1:
The patent designs the working electrode using cost-reduced carbon-based materials that enable the sensor to remain disposable (maintaining measurement precision through frequent replacement) while significantly lowering the cost per unit. This makes frequent replacement more acceptable to patients, reducing the time loss and inconvenience associated with monitoring.
Solution Approach 2:
The patent may incorporate enhanced protective layers or optimized enzyme formulations that extend the functional lifespan of the sensor beyond traditional limits. This allows the sensor to maintain measurement precision for longer periods, reducing the frequency of replacements and associated time loss for patients.
3Measurement precision
If traditional finger prick methods are used for glucose monitoring, then measurement precision is achieved, but ease of operation deteriorates due to pain and inconvenience
Solution Approach 1:
The patent replaces the mechanical finger-prick method with a continuous electrochemical sensing system that uses carbon-based working electrodes to detect glucose levels in interstitial fluid. This substitution eliminates the need for painful needle insertions while providing continuous monitoring, thereby dramatically improving ease of operation and patient convenience while maintaining measurement precision.
4Ease of manufacture
If carbon-based materials are used instead of platinum for the working electrode, then manufacturing cost is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent uses composite materials where carbon-based substrates are combined with enzymatic layers (such as glucose oxidase) and electrochemical mediators. This composite structure compensates for the inherently lower electrocatalytic activity of carbon compared to platinum, enabling the carbon-based electrode to achieve comparable measurement precision while maintaining significant cost advantages.
Solution Approach 2:
The patent optimizes various parameters of the carbon-based electrode including surface area, porosity, and surface treatment to enhance its electrochemical performance. By adjusting these parameters, the carbon electrode achieves measurement precision comparable to platinum while maintaining the cost and manufacturing advantages of carbon materials.
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 new electrode design provides a durable, flexible, and cost-effective solution for continuous glucose monitoring, enabling improved sensitivity and accuracy while reducing manufacturing costs and the frequency of sensor replacements, thus enhancing patient compliance and health outcomes.
Implementation Method 1
A novel working electrode design for CGM systems using a plastic substrate coated with a carbon-containing compound
Implementation Method 2
combined with a novel interference layer and glucose limiting layer
Implementation Method 3
combined with a novel interference layer and glucose limiting layer
Data Source
AI summary
A working electrode for a subcutaneous sensor for use with a continuous biological monitor for a patient is disclosed. The working electrode includes a conductive substrate and a carbon-enzyme layer on the conductive substrate. The carbon-enzyme layer includes a polyurethane or silicone crosslinked with an acrylic polyol, and an enzyme fully entrapped by the polyurethane or silicone crosslinked with the acrylic polyol. The enzyme is selected according to a biological function to be monitored. The carbon-enzyme layer also includes a carbon material. The carbon-enzyme layer is electrically conductive and facilitates a generation of either peroxide or electrons within the carbon-enzyme layer responsive to reacting the enzyme with a target biologic from blood of the patient.