Bio-Electrode Ionic Resin Composition to Prevent Salt Elution

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Solution Overview

Problem

Existing bio-electrodes face challenges in maintaining electric conductivity over time, causing skin allergies, and being difficult to produce at low cost while ensuring biocompatibility and durability.

Innovation Solution

A bio-electrode composition comprising an ionic resin with a structure selected from ammonium, lithium, sodium, potassium, or silver salts formed with trifluoromethoxybenzenesulfonamide and/or difluoromethoxybenzenesulfonamide, combined with a resin that prevents salt elution and enhances adhesiveness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If water-soluble gel containing water and electrolyte is used as bio-electrode material, then electric conductivity is improved, but water loss by drying causes loss of electric conductivity

Engineering Contradiction:

Improveelectric conductivityVSAvoidwater loss

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent changes the physical state parameter from liquid water-based gel to solid polymer-based gel, eliminating water loss while maintaining ion conductivity through the polymer matrix structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material combining polymer base resin with ionic liquid, where the polymer provides structural stability and prevents drying, while the ionic liquid provides continuous ion conductivity without water content

Inventive Principle:

Principle #40Composite materials

2Reliability

If higher-ionization-tendency metal such as copper is used to improve electric conductivity, then electric conductivity is improved, but skin allergy risk increases

Engineering Contradiction:

Improveelectric conductivityVSAvoidskin allergy

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces polymer coating as an intermediary layer between the metal nanowire electrode and the skin, allowing the metal to provide conductivity while the polymer prevents direct skin contact and allergic reactions

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure of polymer base resin with metal nanowires dispersed throughout, where the polymer matrix provides biocompatibility and the metal nanowires provide enhanced conductivity without direct skin exposure

Inventive Principle:

Principle #40Composite materials

3Reliability

If electro-conductive polymer such as PEDOT-PSS is used to improve electric conductivity, then electric conductivity is improved, but skin allergy risk increases due to strong acidity

Engineering Contradiction:

Improveelectric conductivityVSAvoidskin allergy

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameter from acidic electro-conductive polymer to neutral polymer base resin combined with ionic liquid, eliminating acidity-related skin allergies while maintaining conductivity through ionic mechanisms

Inventive Principle:

Principle #35Parameter changes

4Adaptability or versatility

If electro-conductive polymer is incorporated into fibers for wearable application, then adaptability is improved, but peeling occurs during washing

Engineering Contradiction:

Improvewearable applicationVSAvoidpeeling

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent creates a composite material where polymer base resin and ionic liquid form an integrated structure that bonds to fabric fibers, preventing peeling during washing while maintaining wearable flexibility and adaptability

Inventive Principle:

Principle #40Composite materials

5Reliability

If metal nanowire is used to improve electric conductivity with small quantity addition, then electric conductivity is improved, but biocompatibility is degraded due to sharp tip irritation

Engineering Contradiction:

Improveelectric conductivityVSAvoidirritant stimulation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces polymer base resin as an intermediary material that surrounds and covers the metal nanowire sharp tips, allowing the nanowires to provide conductivity at low concentrations while the polymer prevents direct skin contact and irritation

Inventive Principle:

Principle #24Intermediary (Mediator)

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 bio-electrode composition achieves excellent electric conductivity and biocompatibility, is lightweight, cost-effective, and maintains conductivity whether wet or dry, while providing high adhesiveness and stretchability.

Implementation Method 1

converts changes of ion concentration from the skin into electricity

Methodology Applied

Scientific EffectIon-to-electricity conversion:

Implementation Method 2

detecting physical conditions such as heart rate by an electric signal transmitted from the skin

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20250032026A1Bio-Electrode Composition, Bio-Electrode, Method For Manufacturing Bio-Electrode

Publication Date: 2025.01.30 SHIN ETSU CHEMICAL CO LTD

AI summary

The present invention provides: a bio-electrode composition capable of forming a living body contact layer for a bio-electrode which is excellent in electric conductivity and biocompatibility, light-weight, manufacturable at low cost, capable of preventing significant reduction in the electric conductivity even when the bio-electrode is wetted with water or dried, and soft and excellent in stretchability and adhesiveness; a bio-electrode including a living body contact layer formed from the bio-electrode composition; and a method for manufacturing the bio-electrode. To solve the above problems, the inventive bio-electrode composition includes an (A) ionic resin, wherein the component (A) contains a resin having a structure selected from the group consisting of an ammonium salt, a lithium salt, a sodium salt, a potassium salt, and a silver salt formed with trifluoromethoxybenzenesulfonamide and/or difluoromethoxybenzenesulfonamide.