Interfacing Perforated Eardrums with Graphene-Based Membranes for Broadband Hearing Recovery

Area of Science:

• Biomedical Engineering
• Materials Science
• Otolaryngology

Background:

• Eardrum perforation causes hearing loss, with current treatments poorly restoring high-frequency hearing.
• Autologous tissue grafts offer limited success in high-frequency hearing recovery.
• Need for advanced biomaterials to address eardrum defects and hearing loss.

Purpose of the Study:

• To investigate the efficacy of a multilayered graphene membrane (MGM) as a graft for eardrum perforations.
• To evaluate MGM's biocompatibility, biostability, and impact on hearing recovery in a rat model.
• To explore the potential of MGM for broadband hearing restoration.

Main Methods:

• Implantation of thin multilayered graphene membranes (MGM) into perforated eardrums of rats.
• Assessment of cellular response, tissue integration, and inflammatory markers post-implantation.
• Evaluation of hearing recovery across a broad frequency range (1-32 kHz) over time.
• Mechanical simulations to understand the role of MGM properties in hearing restoration.

Main Results:

• MGM demonstrated excellent biocompatibility and biostability, promoting regulated eardrum cell growth with minimal inflammation.
• Successful sealing of eardrum perforations and encapsulation by newly grown tissue without significant folding.
• Achieved and maintained broadband hearing recovery (1-32 kHz) for at least 2 months.
• Mechanical simulations highlighted the importance of MGM's high elastic modulus and thinness for high-frequency hearing recovery.

Conclusions:

• Multilayered graphene membranes (MGM) show significant promise as functional grafts for perforated eardrums.
• MGM facilitates broadband hearing recovery, addressing limitations of current autologous grafting techniques.
• This study suggests a novel application for graphene-based 2D materials in acoustics and regenerative medicine.