Polymer electret guidance channels enhance peripheral nerve regeneration in mice

Polytetrafluoroethylene (PTFE) tubes were prepared as electrets displaying a quasi-permanent surface charge due to the presence of trapped monopolar charge carriers. PTFE tubes containing either positive or negative charges and electrically neutral PTFE tubes were used as nerve guidance channels for the repair of a 4 mm nerve gap in the sciatic nerve of mice. After 4 weeks of implantation, positively and negatively charged PTFE electrets contained regenerated nerves with significantly more myelinated axons than nerves regenerated in uncharged PTFE tubes. This observation suggests that peripheral nerve regeneration can be enhanced by electrically charged nerve guidance channels.