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Materials for Implantable Surface Electrode Arrays: Current Status and Future Directions.
Christina M Tringides1,2,3, David J Mooney3,4
1Harvard Program in Biophysics, Harvard University, Cambridge, MA, 02138, USA.
Advanced Materials (Deerfield Beach, Fla.)
|October 30, 2021
Summary
Next-generation surface electrode arrays require tailored materials and mechanical properties for specific biological tissues. Optimizing implant design for target organs like the nervous system, muscles, and skin enhances conformability and reduces tissue damage.
Area of Science:
- Biomaterials Science
- Neuroengineering
- Tissue Engineering
- Medical Device Design
Background:
- Current surface electrode arrays use rigid or elastic materials with limited stretchability, unsuitable for nonlinear viscoelastic biological tissues.
- Existing electrode designs are often generalized across diverse tissues, neglecting organ-specific mechanical and environmental requirements.
- Significant tissue deformation in dynamic biological environments challenges the performance and longevity of current electrode interfaces.
Purpose of the Study:
- To review materials and fabrication methods for surface electrode arrays.
- To describe electrically active implants in the nervous, muscular, and skin systems.
- To discuss the development of next-generation surface arrays optimized for specific biological applications.
Main Methods:
- Review of materials used in surface electrode array components.
- Description of electrically active implants in the nervous system, muscular system, and skin.
- Discussion of fabrication techniques for advanced surface electrode arrays.
Main Results:
- Identified limitations of current rigid and elastic electrode materials in conforming to dynamic biological tissues.
- Highlighted the need for application-specific material and mechanical property optimization for electrode implants.
- Presented strategies for designing conformable surface electrode arrays with improved tissue integration.
Conclusions:
- Tailoring surface electrode array design to specific biological environments and organs is crucial for improved performance.
- Optimized electrode arrays offer better tissue interfaces, reduced damage, and enhanced conformability.
- Future research should focus on developing next-generation arrays that overcome current material and mechanical limitations.
