Viscoelastic Conductive Hydrogel for Tissue-Matching Electrodes
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Solution Overview
Problem
Existing surface electrode arrays for monitoring electrophysiology of tissues like the brain and heart do not match the mechanical properties of these tissues, leading to poor conformability and significant inflammatory responses.
Innovation Solution
Development of viscoelastic electrode arrays composed of viscoelastic conductive composites that match the mechanical properties of soft tissues, using crosslinked polymers like alginate hydrogels with conductive fillers such as graphene flakes and carbon nanotubes, which are biocompatible and can conform to complex tissue geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing surface electrode arrays are used to monitor electrophysiology, then electrical signal recording is achieved, but mechanical property mismatch with soft tissues causes poor conformability and significant inflammatory responses
Solution Approach 1:
The patent changes the mechanical parameters of the electrode array by using viscoelastic hydrogel materials with tunable storage and loss moduli to match the mechanical properties of soft tissues like brain and heart, thereby reducing mechanical mismatch and inflammatory response while maintaining electrical recording capability
Solution Approach 2:
The patent employs composite materials consisting of viscoelastic hydrogel matrices combined with conductive fillers (such as carbon nanotubes, graphene, or metallic particles) to achieve both tissue-matching mechanical properties and adequate electrical conductivity for reliable signal recording
2Stability of the object's composition
If rigid electrode arrays are used for electrical monitoring, then structural stability is maintained, but conformability to complex tissue geometries is poor
Solution Approach 1:
The patent introduces dynamic mechanical behavior by using viscoelastic materials that can adapt their stiffness and conformability in response to tissue deformation and movement, allowing the electrode array to maintain both structural integrity and excellent conformability to complex tissue geometries
Solution Approach 2:
The patent uses flexible hydrogel-based thin film structures that can conform to complex tissue surfaces while maintaining structural coherence, replacing rigid electrode substrates with compliant viscoelastic materials that adapt to tissue topology
3Ease of manufacture
If non-biocompatible materials are used for electrodes, then manufacturing simplicity is maintained, but cell viability and functionality are compromised
Solution Approach 1:
The patent modifies the chemical and physical parameters of the electrode materials by using biocompatible hydrogel compositions with appropriate crosslinking densities, pore sizes, and surface properties that support cell adhesion and functionality while maintaining ease of fabrication through established hydrogel processing techniques
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 viscoelastic electrode arrays provide improved conformability and biocompatibility, allowing cells to attach and function while maintaining electrical conductivity, reducing inflammatory responses and enhancing signal recording capabilities.
Implementation Method 1
the polymer is ionically crosslinked with a crosslinking agent selected from the group consisting of a Ca2+ salt, a Mg2+ salt, a Mn2+ salt, a Be2+ salt, a Sr2+ salt, a Ba2+ salt, and a Ra2+ salt
Implementation Method 2
the conductive filler comprises a conductive microparticle or a conductive nanoparticle, wherein the conductive microparticle or the conductive nanoparticle contacts another conductive microparticle or another conductive nanoparticle to form a percolating path
Implementation Method 3
the viscoelastic conductive material has a viscoelastic property that matches the viscoelastic property of a tissue
Data Source
AI summary
Disclosed herein are viscoelastic conductive composite. The viscoelastic conductive composite includes a viscoelastic conductive material; and a conductive filler. The viscoelastic conductive material has a viscoelastic property that matches the viscoelastic property of a tissue.