Multi-Field Enzyme Electrode for In-Vivo Analyte Measurement
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Solution Overview
Problem
Existing electrode systems for in-vivo analyte concentration measurement are prone to interference and have low accuracy due to their small enzyme layer size, which makes them susceptible to transient local effects and fluid exchange issues, leading to unreliable measurements.
Innovation Solution
The electrode system features a working electrode with an enzyme layer arranged in multiple fields spaced at least 3 mm apart, accompanied by a diffusion barrier and a spacer to slow analyte diffusion and maintain fluid exchange, allowing for more reliable and flexible measurement of analyte concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the enzyme layer area is increased to improve measurement reliability, then the measurement accuracy improves, but the enzyme layer becomes more susceptible to mechanical damage and leakage
Solution Approach 1:
The enzyme layer is divided into multiple separate fields (first field, second field, third field, fourth field) arranged on the working electrode. Each field is surrounded by its own insulation layer, creating isolated measurement zones. This segmentation allows the total enzyme area to be increased for better measurement reliability while each individual field remains small and mechanically robust.
Solution Approach 2:
Insulation layers are introduced as intermediary elements between the enzyme fields and the surrounding tissue, and between adjacent enzyme fields. These insulation layers prevent enzyme leakage into surrounding tissue while maintaining the electrical isolation between different enzyme fields, thus protecting the enzyme layer integrity.
2Measurement precision
If multiple working electrodes are used to improve measurement reliability, then the measurement accuracy improves, but the device complexity and resource utilization increase
Solution Approach 1:
Multiple enzyme fields (first, second, third, and fourth fields) are integrated onto a single working electrode. Each field is electrically isolated by insulation layers but collectively forms part of one electrode system. This merging approach achieves the statistical reliability of multiple electrodes while maintaining a simpler single-electrode structure.
Solution Approach 2:
Instead of adding multiple electrodes in the spatial dimension, the solution extends the enzyme layer functionality across different spatial locations on the same electrode plane, with each field separated by insulation layers. This dimensional arrangement provides multiple measurement zones without increasing the number of discrete electrode components.
3Strength
If the enzyme layer is made small to maintain mechanical integrity, then the enzyme layer strength improves, but the measurement reliability decreases due to transient local effects
Solution Approach 1:
The enzyme layer is segmented into multiple small fields (first, second, third, fourth fields) that are distributed across the working electrode. Each field maintains the small size needed for mechanical integrity, while the collective arrangement of multiple fields provides sufficient total measurement area to overcome transient local effects and improve overall measurement reliability.
4Speed
If the enzyme layer is made highly water-permeable to improve analyte diffusion, then the analyte transport improves, but the enzyme molecules can leak into surrounding tissue
Solution Approach 1:
Insulation layers are positioned as intermediary barriers between the enzyme fields and the surrounding body tissue. These insulation layers create a physical boundary that prevents enzyme molecules from leaking into the surrounding tissue while still allowing analyte molecules to diffuse from the body fluid through the insulation layer to reach the enzyme fields for measurement.
Solution Approach 2:
The insulation layers are implemented as thin film structures that cover the enzyme fields. These thin films provide a selective barrier function - they are sufficiently permeable to allow analyte diffusion to the enzyme while being impermeable to the larger enzyme molecules, thus preventing enzyme leakage into surrounding tissue.
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 design significantly improves measurement reliability and accuracy by reducing the impact of transient local effects and enabling flexible electrode placement, ensuring that analyte concentrations are representative of larger body volumes, even under movement and fluid exchange disturbances.
Implementation Method 1
a diffusion barrier which slows diffusion of the analyte from body fluid surrounding the electrode system to enzyme molecules
Implementation Method 2
enzyme molecules for catalytic conversion of the analyte. In the process, an electrical current is generated as measuring signal
Data Source
AI summary
Electrode systems are disclosed for measuring the concentration of an analyte under in-vivo conditions, where such systems include a counter electrode having an electrical conductor, a working electrode having an electrical conductor on which an enzyme layer containing immobilized enzyme molecules for catalytic conversion of the analyte is arranged, and a diffusion barrier that slows the diffusion of the analyte from body fluid surrounding the electrode system to enzyme molecules. The enzyme layer is in the form of multiple fields that are arranged on the conductor of the working electrode at a distance from each other.