Hearing restoration by a low-weight power-efficient multichannel optogenetic cochlear implant system

Area of Science:

• Biomedical Engineering
• Neuroscience
• Otolaryngology

Background:

• Electrical cochlear implants (eCIs) restore hearing but have limited spectral selectivity due to wide current spread.
• Optical cochlear implants (oCIs) utilizing optogenetics offer a potential solution with spatially confined stimulation.

Purpose of the Study:

• To develop and characterize a miniaturized, wireless, LED-based multichannel oCI system.
• To compare the performance of the oCI system with its eCI counterpart.
• To evaluate the oCI system's efficacy in a preclinical model of deafness.

Main Methods:

• Development of a 15g, 20mm diameter/height wireless LED-based multichannel oCI system.
• Characterization of the oCI system's performance and longevity (up to 8 hours).
• Behavioral studies in freely moving, deafened rats using the oCI system for auditory cueing.

Main Results:

• The wireless oCI system successfully operated for up to 8 hours in behavioral experiments.
• Deafened rats utilized the oCI system to perform locomotion tasks in response to acoustic stimulation.
• The system proved the utility of multichannel optogenetic hearing restoration in a rodent model.

Conclusions:

• The developed head-worn oCI system demonstrates the feasibility of multichannel optogenetic hearing restoration.
• This preclinical success supports the advancement of oCI technology towards clinical applications for improved hearing restoration.
• The findings pave the way for implementing oCI systems in diverse species and future human clinical trials.