Hydrogel Electrode Interface for Stable VR Bioelectrical Sensing
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Solution Overview
Problem
Existing bioelectrical signal detection methods, including invasive and non-invasive electrodes, suffer from issues such as discomfort, immune response, unstable signal quality due to skin gaps, high impedance, and poor reusability, limiting their effectiveness for long-term and high-sensitivity applications.
Innovation Solution
A hydrogel-based interface material with reversible chemical bonds, alkali metal salts for conductivity, tannic acid for viscosity, and UV curing is used to create a reusable and low-impedance electrode-skin interface, enhancing elasticity and skin compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive electrodes are used to achieve high-precision detection, then measurement precision is improved, but object-affected harmful factors worsen due to discomfort, immune response, and tissue damage
Solution Approach 1:
The patent introduces a hydrogel layer as an intermediary substance between the electrode and the skin. This hydrogel acts as a mediator that improves electrical contact and signal quality without requiring invasive penetration into the tissue, thereby maintaining measurement precision while eliminating the harmful effects of invasion such as discomfort, immune response, and tissue damage
Solution Approach 2:
The patent changes the physical state of the electrode interface from solid (invasive needle) to gel (hydrogel). This parameter change in material state allows the electrode to maintain good electrical contact with the skin through the gel's ability to conform to skin surface and retain electrolyte, achieving high-precision detection without tissue invasion
2Object-affected harmful factors
If dry electrodes are used to avoid invasion, then object-affected harmful factors are reduced, but measurement precision worsens due to skin folds forming gaps and high interface impedance
Solution Approach 1:
The patent creates a composite electrode structure combining conductive materials with hydrogel. This composite material integrates the electrical conductivity of traditional electrodes with the skin-conforming and electrolyte-retaining properties of hydrogel, thereby eliminating gaps caused by skin folds and reducing interface impedance to improve signal quality without invasive damage
Solution Approach 2:
The patent employs a flexible hydrogel layer as the electrode interface. This thin film structure can conform to the contours of the skin surface, filling in gaps that would otherwise form due to skin folds, thereby maintaining consistent electrical contact and improving measurement precision without the harmful effects of invasion
3Measurement precision
If existing wet electrodes are used to improve signal quality, then measurement precision is improved, but reliability worsens due to poor reusability and gel drying over time
Solution Approach 1:
The patent modifies the chemical composition and physical properties of the hydrogel to enhance its stability and reusability. By adjusting parameters such as crosslinking density, polymer composition, and electrolyte content, the hydrogel maintains its moisture-retaining properties and electrical conductivity over repeated use and disinfection cycles, thereby improving reliability while maintaining high signal quality
Solution Approach 2:
The patent designs the hydrogel with self-healing and self-moisturizing properties. The hydrogel network structure automatically retains water and maintains its viscoelastic properties without external intervention, allowing the electrode to be reused multiple times after disinfection without significant degradation in performance, thereby improving reliability
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 interface material achieves stable, high-sensitivity bioelectrical signal detection, maintaining signal quality for up to 100 disinfections and comparable to invasive electrodes, with low impedance and adhesion, suitable for long-term use.
Implementation Method 1
introduces a reversible chemical bond to improve elasticity and optimize skin compliance
Implementation Method 2
Based on the ion transport theory of bioelectrical signals, alkali metal salt is added to improve ionic conductivity
Implementation Method 3
Tannic acid is added to impart viscosity and avoid electrode-skin gaps
Implementation Method 4
Ultraviolet (UV) curing is to conduct irradiation with a UV lamp and synthesize a pregel
Data Source
AI summary
The present disclosure relates to an interface material for virtual reality interaction and a preparation method therefor. The interface material is composed of an ionic conductive self-adhesive hydrogel and an organic solvent. The preparation method includes: (1) preparing a prepolymer solution; (2) preparing a bioelectrical sensing pregel by ultraviolet (UV) curing; and (3) preparing an interface material for virtual reality interaction by solvent extraction. The preparation method of the present disclosure is simple and cost-effective, and can be used for large-scale production. The obtained gel interface material has excellent properties such as high stability, high sensitivity, non-invasiveness, and reusability, can be used for detection of bioelectrical signals such as electromyography (EMG) signals and electroencephalography (EEG) signals, and has important application value in the field of virtual reality interaction.