Textile Hydrogel EOG Electrode for Low-Artifact Long-Term Wear

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Solution Overview

Problem

Existing eye tracking technologies, particularly video-based systems, are not suitable for portable, long-term applications due to high computational power requirements, while conventional gel-based electrodes for electro-oculography (EOG) are uncomfortable, impractical for continuous wear, and dry electrodes suffer from motion artifacts and erratic signals.

Innovation Solution

A textile-based hydrogel electrode with a conductive structure and hydrogel body forms an ionic interface to generate electrical signals for EOG, providing a comfortable, durable, and wash-stable solution for long-term eye movement tracking with minimal motion artifacts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If video-based eye tracking is used, then eye movement detection capability is achieved, but computational power consumption is excessive for portable applications

Engineering Contradiction:

Improveeye movement detection capabilityVSAvoidcomputational power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent replaces the video-based optical detection system with an electro-oculography system that measures electrical potentials generated by the eye. This substitution eliminates the need for cameras and complex image processing algorithms, dramatically reducing computational power requirements while maintaining eye movement detection capability. The EOG system records the corneo-retinal standing potential that changes with eye position, providing a low-power alternative suitable for portable wearables.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If conventional gel-based electrodes are used for EOG, then biopotential measurement capability is achieved, but comfort and practicality for continuous wear deteriorates

Engineering Contradiction:

Improvebiopotential measurement capabilityVSAvoidcomfort and practicality for continuous wear

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent changes the physical and chemical parameters of the electrode material from conventional gel-based formulations to a hydrogel composition with optimized water content, crosslinking density, and ionic conductivity. This parameter optimization enables the electrode to maintain stable biopotential measurement capability while achieving comfort levels suitable for continuous wear. The hydrogel's soft, skin-like properties reduce irritation and improve tolerability during prolonged use.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite electrode structure combining hydrogel material with conductive components and textile substrate. This composite design integrates the electrical conductivity needed for biopotential measurement with the mechanical comfort and flexibility required for continuous wear. The hydrogel layer provides ionic conduction pathways while the textile backing ensures breathability and skin compatibility, creating an electrode that is both functional and comfortable for long-term use.

Inventive Principle:

Principle #40Composite materials

3Ease of operation

If dry electrodes are used for EOG, then ease of use is improved, but signal quality deteriorates due to motion artifacts and erratic signals

Engineering Contradiction:

Improveease of useVSAvoidsignal quality

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent introduces a hydrogel layer as an intermediary between the conductive electrode component and the skin surface. This hydrogel intermediary maintains stable ionic contact with the skin, reducing motion-induced signal variations and eliminating the erratic signals characteristic of dry electrodes. The hydrogel's viscoelastic properties allow it to accommodate skin movements while maintaining continuous electrical contact, thereby preserving signal quality without compromising ease of use.

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 textile-based hydrogel electrode offers accurate, long-term EOG measurements with high signal-to-noise ratio, breathability, and comfort, enabling reliable eye tracking and pulse monitoring for daily use.

Implementation Method 1

the specified portion of the conductive structure comprises a first material that ionically interacts with the hydrogel material to form an ionic interface between the hydrogel body and the conductive structure

Methodology Applied

Scientific EffectIonic interaction: Ion Exchange

Data Source

PatentUS12465274B2Wearable textile-based hydrogel electrode for measuring biopotential

Publication Date: 2025.11.11 UNIV OF MASSACHUSETTS

AI summary

A textile-based hydrogel electrode comprises a textile-based backing layer, a conductive structure coupled to the textile-based backing layer, and a hydrogel body in contact with at least a first portion of the conductive structure, wherein the first portion of the conductive structure and the hydrogel body form an ionic interface configured to generate an electrical signal through the conductive structure corresponding to a biopotential change proximate to the textile-based hydrogel electrode.