Fuel Cell Analyte Sensor Enzyme Layer Diffusion Path
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Solution Overview
Problem
In vivo analyte concentration measurement using fuel cells is affected by oxygen deficiency and the formation of harmful intermediate products like hydrogen peroxide, leading to inaccurate and short-lived measurements.
Innovation Solution
A method where the analyte is catalytically converted to generate a redox amphoteric product that oxidizes on the anode and reduces on the cathode, independent of local oxygen concentration, using an enzyme layer that forms a diffusion path between the electrodes, reducing the impact of oxygen reduction reactions and minimizing harmful intermediate product effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If oxygen reduction reaction is used on the cathode for analyte measurement, then the measuring signal can be generated, but the measurement precision deteriorates due to oxygen deficiency and local concentration variations in subcutaneous tissue
Solution Approach 1:
The invention extracts and eliminates the oxygen-dependent cathode reaction from the fuel cell system. By removing the oxygen reduction reaction requirement, the patent solves the problem of oxygen deficiency affecting measurement precision and reliability in subcutaneous tissue.
Solution Approach 2:
The invention converts the harmful intermediate product hydrogen peroxide, which was previously problematic, into a useful fuel for the cathode reaction. By having the cathode reduce hydrogen peroxide instead of requiring oxygen, the patent transforms a harmful substance into a beneficial reactant, improving both measurement precision and eliminating oxygen dependency.
2Power
If conventional fuel cell reactions are used with oxygen reduction on cathode, then energy conversion occurs, but harmful intermediate products like hydrogen peroxide accumulate causing inflammation and premature sensor removal
Solution Approach 1:
The patent applies the blessing in disguise principle by converting hydrogen peroxide from a harmful intermediate product that causes inflammation into a useful fuel for the cathode reaction. The cathode is designed to reduce hydrogen peroxide, thereby eliminating its harmful effects while maintaining energy conversion efficiency.
Solution Approach 2:
The invention discards the conventional oxygen reduction pathway and recovers hydrogen peroxide as a useful reactant. Instead of allowing hydrogen peroxide to accumulate and cause harm, the system recovers it by using it as the substrate for cathode reduction, thereby eliminating toxicity while maintaining power generation.
3Productivity
If enzyme layers are added to both anode and cathode to accelerate reactions, then reaction efficiency improves, but device complexity increases
Solution Approach 1:
The patent applies universality by using the enzyme layer on the anode to perform dual functions: catalyzing the oxidation of analyte (glucose) and also serving as the source of hydrogen peroxide fuel for the cathode reaction. This eliminates the need for a separate enzyme layer on the cathode, reducing device complexity while maintaining high reaction efficiency.
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 enables precise and prolonged analyte concentration measurement with reduced harmful effects from intermediate products, as the reaction rate of the product's reduction dominates over oxygen reduction, and no external voltage is required for hydrogen peroxide conversion.
Implementation Method 1
the analyte to be measured is catalytically converted as the fuel of the fuel cell
Implementation Method 2
the analyte to be measured oxidizes on the anode
Implementation Method 3
said product then oxidizing on the anode
Implementation Method 4
and being reduced on the cathode
Implementation Method 5
The enzyme layer of the sensor forms a diffusion path for a product generated by catalytic conversion of the analyte
Data Source
AI summary
The invention relates to a method for the electrochemical measurement of an analyte concentration in vivo, comprising a fuel cell with which the analyte to be measured is reacted catalytically with an enzyme contained in an enzyme layer and which supplies an electrical voltage, dependent on the analyte concentration to be measured, between an anode and a cathode, which voltage is measured. In the catalytic reaction of the analyte to be measured in the enzyme layer, a product is generated which, as fuel of the fuel cell, oxidizes on the anode and is reduced on the cathode. The invention further relates to a fuel cell for such a method.