Conductive Adhesive Electrode Patch for Stable Long-Term Skin Contact
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Solution Overview
Problem
Existing skin surface electrodes face challenges with long-term stability, skin irritation, and moisture-induced resistance changes, particularly in gel-based and polymer-based systems, which affect their reliability and homogeneity in electrophysical measurements.
Innovation Solution
A layered body comprising a substrate with a conductive adhesive layer made from a polymer matrix and cationic polythiophene/polymeric anion particles, which is self-adhesive and maintains low resistance without the need for liquid electrolytes, ensuring immediate and long-term reliable measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel-based electrodes are used for skin contact, then good initial adhesion is achieved, but long-term stability deteriorates due to moisture-induced resistance changes and skin irritation
Solution Approach 1:
The invention changes the chemical composition parameters by replacing traditional gel electrolytes with a specific polymer composition (polymer A with carboxylic acid groups and polymer B as conductive polymer) that maintains adhesion without causing skin irritation. The polymer ratio and molecular weight parameters are optimized to achieve both adhesion and long-term stability.
Solution Approach 2:
The invention uses a composite material system combining two different polymers (polymer A with carboxylic acid groups for adhesion and polymer B conductive polymer for electrical conductivity) to achieve properties that neither material alone could provide, resolving the contradiction between adhesion and long-term stability.
2Object-affected harmful factors
If conductive polymer systems are used for long-term applications, then skin compatibility is improved, but transition resistance changes due to moisture absorption
Solution Approach 1:
The invention modifies the polymer composition parameters by selecting polymers with specific glass transition temperatures and functional groups that reduce moisture absorption. The carboxylic acid groups in polymer A form hydrogen bonds that stabilize the structure against moisture-induced changes.
Solution Approach 2:
The carboxylic acid groups in polymer A act as intermediaries that form hydrogen bonding networks, mediating between the conductive polymer B and the external environment to prevent moisture from directly affecting the conductive properties.
3Manufacturing precision
If metallic conductive structures are used to achieve homogeneous potential distribution, then measurement homogeneity is improved, but fabrication complexity and cost increase
Solution Approach 1:
The invention replaces complex metallic conductive structures with a uniformly applied polymer-based conductive adhesive layer. The conductive polymer B distributed throughout the adhesive matrix provides homogeneous conductivity without requiring precision metal patterning or complex fabrication processes.
Solution Approach 2:
The invention achieves homogeneous potential distribution through a homogeneous distribution of conductive polymer B particles throughout the adhesive layer, eliminating the need for complex metallic trace patterns. The uniform composition ensures consistent electrical properties across the entire electrode surface.
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 solution provides a self-adhesive, cost-effective, and reliable skin surface electrode with stable electrical properties, resistant to moisture-induced changes, suitable for long-term applications in electrophysical measurements.
Implementation Method 1
the conductive adhesive layer comprises IIa) a polymer forming a matrix and IIb) particles of a conductive polymer distributed in the matrix
Implementation Method 2
the polymer comprises repeating units having the general structure —CH2—CR1—COOR2— wherein R1 represent H or an alkyl group and R2 represents an optionally substituted C1-C10-alkyl group
Data Source
AI summary
Disclosed is a layered body comprising a polymer comprising repeating units having the general structure —CH2—CHR1—COOR2— as defined herein, to a process for producing such a layered body, to a layered body produced by that process and to the use of a layered body for electrophysical measurements.