Conductive Elastomeric Filaments for Biopotential Electrodes
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Solution Overview
Problem
Existing biopotential electrodes with wet gel interfaces are cumbersome, cause skin irritation, and have limited lifespan due to degradation over time, making them unsuitable for long-term electrophysiological monitoring.
Innovation Solution
Development of conductive elastomeric filaments and yarns with a biocompatible composition, specifically combining elastomeric polymers like silicone with conductive fillers such as carbon, which are woven or knitted into dry textile electrodes, providing flexibility, durability, and breathability for comfortable and reliable long-term monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wet gel is used in electrodes to reduce impedance at the skin-electrode interface, then sensing of biopotential signals is improved, but application becomes difficult and skin irritation occurs
Solution Approach 1:
The patent changes the physical state of the electrode material from wet gel to dry conductive elastomeric material. This parameter change eliminates the need for gel application while maintaining electrical conductivity through the use of conductive fillers (carbon black, graphite, or metal particles) embedded in the elastomeric matrix, thereby improving ease of operation without sacrificing signal sensing capability
Solution Approach 2:
The patent employs composite materials by combining elastomeric polymer with conductive fillers to create a dry electrode material that simultaneously provides flexibility, comfort, and electrical conductivity. This composite approach replaces the traditional wet gel while maintaining the necessary electrical properties for biopotential signal sensing
2Measurement precision
If wet gel electrodes are used to improve electrical contact, then signal sensing is enhanced, but lifespan is limited due to degradation over time
Solution Approach 1:
The patent changes the chemical composition and physical state from wet gel to dry conductive elastomeric material. This eliminates the degradation issues associated with gel drying and chemical instability, providing a stable electrode that maintains its electrical and mechanical properties over extended periods, thereby significantly extending lifespan
Solution Approach 2:
The patent creates a reusable electrode material that eliminates the need for disposable wet gel electrodes. The dry conductive elastomeric material can be washed and reused multiple times without degradation, reducing waste and long-term costs while maintaining signal sensing performance
3Reliability
If traditional wet gel electrodes are used for monitoring, then electrical contact is achieved, but skin comfort is compromised
Solution Approach 1:
The patent changes the electrode material from wet gel to dry conductive elastomeric material, eliminating the skin irritation caused by gel components while maintaining electrical contact through the conductive filler network. This parameter change removes the harmful factors without compromising reliability
Solution Approach 2:
The patent uses a composite of elastomeric material and conductive fillers to create an electrode that is both electrically conductive and skin-friendly. The elastomeric base provides comfort and flexibility, while the conductive fillers ensure reliable electrical contact, eliminating the need for irritating wet gel
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 conductive elastomeric textile electrodes maintain high fidelity in electrophysiological signal recordings, are resistant to wash cycles, and ensure skin comfort, offering a viable alternative to traditional wet gel electrodes for continuous health monitoring.
Implementation Method 1
a conductive elastomeric filament comprising a elastomeric polymer and conductive filler
Implementation Method 2
the conductive elastomeric filament has a ΔR/R0 of less than 2.3 for 100% strain
Data Source
AI summary
A biocompatible yarn comprising a conductive elastomeric filament, the conductive elastomeric filament comprising a elastomeric polymer and conductive filler.