Textile Electrode Moisture Barrier for EEG Signal Stability
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Solution Overview
Problem
Prior art medical electrodes face challenges such as high contact electrical resistance, discomfort, and inability to measure small electrical signals like EEG signals effectively, especially during long-term experiments or under relaxed conditions, due to issues with adhesion, perspiration, and gel evaporation.
Innovation Solution
A textile electrode with a conductive textile contact supported by an elastic textile, impregnated with conductive gel, and a moisture barrier sheet material with a low water vapor transmission rate to reduce gel evaporation, combined with a flexible vapour barrier sheet and electronic devices for signal processing, integrated into wearable clothing for improved comfort and signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conductive gel is applied on the electrode to reduce contact resistance, then electrical signal detection is improved, but the gel solvent evaporates over time reducing long-term measurement capability
Solution Approach 1:
The patent introduces a moisture barrier layer as an intermediary component between the conductive gel and the external environment. This layer mediates the conflict by allowing the gel to maintain its function while preventing the harmful evaporation that would otherwise occur, thus extending the electrode's operational duration without compromising signal detection quality
Solution Approach 2:
The patent employs a thin film moisture barrier layer that is flexible and conformable to the skin. This thin film structure prevents gel solvent evaporation while maintaining the electrode's flexibility and comfort for long-term wear, resolving the contradiction between maintaining gel integrity for signal detection and allowing long-term continuous use
2Measurement precision
If standard medical electrodes with metallic surface and adhesive are used, then electrical signal measurement is achieved, but adhesion failure occurs and comfort is reduced
Solution Approach 1:
The patent replaces the mechanical adhesive bonding system with a moisture-based adhesion mechanism. The conductive gel naturally adheres to both the skin and the electrode surface through its viscous properties, eliminating the need for separate adhesive layers that are prone to failure. This substitution maintains reliable contact while improving comfort and signal quality
Solution Approach 2:
The patent creates a composite electrode structure combining conductive textile fibers, conductive gel, and moisture barrier layer. This composite material system integrates multiple functions: the textile provides flexibility and comfort, the gel ensures electrical conductivity and adhesion, and the barrier layer prevents evaporation, together resolving the adhesion and reliability issues of traditional metallic electrodes
3Ease of operation
If textile based electrode is used to improve comfort, then wearability is enhanced, but contact electrical resistance becomes too high for small signal detection
Solution Approach 1:
The patent merges the advantages of textile-based electrodes (comfort and flexibility) with conductive gel properties (low contact resistance) by integrating the gel into the textile structure. The conductive gel is applied to or embedded within the textile fibers, creating a hybrid electrode that simultaneously achieves high comfort for long-term wear and low enough contact resistance to detect small electrical signals like EEG
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 textile electrode significantly reduces contact resistance and evaporation of conductive gel, enabling long-term measurement of small electrical signals like EEG with improved comfort and reduced noise, making it suitable for sleep studies and other applications.
Implementation Method 1
a moisture barrier sheet material with a low water vapor transmission rate to reduce gel evaporation
Implementation Method 2
the impedance between the skin and the metallic surface is reduced by the use of a conductive gel, for example silver gel or the use of a sponge-like material filled with an aqueous solution containing an electrolyte
Implementation Method 3
Textile electrode for measuring an electrical signal from a body part
Data Source
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AI summary
The present invention is related to a textile electrode (1) for measuring an electrical signal from a body part, said electrode comprising, successively from the side to be applied on the body part to the outside: a conductive textile contact (3) to be applied to said body part; a textile support (2) for supporting said textile contact (3); a vapour barrier sheet material (7) able to reduce, in use, evaporation of liquid from said textile electrode (1).