Suture-Free Piezoelectric Band-Aid Membrane for Complex Peripheral Nerve Defects

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Peripheral nerve defects present significant challenges in regeneration and functional recovery.
• Current grafting methods are often inadequate for complex nerve structures.
• Piezoelectric materials show promise for restoring nerve morphology and function.

Purpose of the Study:

• To develop an innovative, suture-free nerve repair membrane for complex peripheral nerve defects.
• To investigate the efficacy of a Janus membrane combining adhesive hydrogel and piezoelectric silk fibroin fibers.
• To assess the potential for simplified and effective clinical management of nerve injuries.

Main Methods:

• Fabrication of a Janus membrane via electrospinning, featuring an inner adhesive hydrogel layer (gelatin methacryloyl, tannic acid) and an outer piezoelectric silk fibroin layer.
• In vivo implantation of the membrane to bridge peripheral nerve defects.
• Evaluation of surgical procedure, nerve bridging capability, morphological recovery, and functional nerve rehabilitation.

Main Results:

• The band-aid-inspired membrane demonstrated adaptability to diverse nerve diameters and branching patterns.
• Sutures were eliminated, streamlining the surgical process for nerve repair.
• The membrane facilitated rapid and facile bridging of complex nerve defects.
• Significant improvements in both morphological and functional nerve recovery were observed in vivo.

Conclusions:

• The developed suture-free piezoelectric Janus membrane represents a significant advancement in peripheral nerve repair.
• This technology offers a simplified, personalized, and effective approach for clinical management of nerve defects.
• The findings suggest potential applications for repairing other tissues and organs with irregular morphologies.