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Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
Published on: October 20, 2021
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Electrical stimulation via repeated biphasic conducting materials for peripheral nerve regeneration
Tabitha N Rosenbalm1,2, Nicole H Levi3,4, Michael J Morykwas1,2
1School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Polytechnic Institute and State University, Winston-Salem, NC, 27106, USA.
Journal of Materials Science. Materials in Medicine
|November 14, 2023
Summary
New bioresorbable conductive nerve conduits accelerate peripheral nerve repair. These materials, featuring alternating conductive segments, significantly enhanced neuronal cell growth and improved outcomes in animal models compared to traditional methods.
Area of Science:
- Biomaterials Science
- Neuroscience
- Regenerative Medicine
Background:
- Peripheral nerve injuries pose significant challenges in reconstructive surgery.
- Current materials for nerve repair often lack the necessary electrical properties to actively promote regeneration.
Purpose of the Study:
- To develop novel bioresorbable, electrically conductive composite materials for peripheral nerve repair.
- To assess the impact of patterned electric fields on neuronal cell growth and migration.
- To evaluate the efficacy of these materials in a preclinical nerve repair model.
Main Methods:
- Fabrication of biphasic composites using poly(glycerol) sebacate acrylate (PGSA) doped with poly(pyrrole) (PPy).
- Characterization of electrical conductivity, mechanical properties, and degradation rates.
- In vitro culture of neuronal and fibroblast cells on the composite materials.
- In vivo evaluation of tubular conduits in a rat sciatic nerve model.
Main Results:
- Optimized PGSA/PPy composites exhibited suitable conductivity (1.25 × 10-4 S/cm) and mechanical properties matching nerve tissue.
- Neuronal cells cultured on stimulated composites showed a 5-10x increase in cell numbers.
- In vivo studies demonstrated superior performance of the biphasic conduits compared to silicone conduits for nerve repair.
Conclusions:
- Biphasic conducting conduits offer a promising approach for accelerating peripheral nerve repair.
- The developed materials support cell growth and enhance regeneration in vivo.
- These advanced materials could benefit patients with previously untreatable nerve injuries.
