Related Experiment Videos
New approach for implantable hearing aids: a feasibility study
Jean-Yves Sichel1, Sharon Freeman, Zvi Fleishman
1Department of Otolaryngology-Head and Neck Surgery, Hebrew University-Hadassah University Hospital, Jerusalem, Israel.
The Annals of Otology, Rhinology, and Laryngology
|November 26, 2004
Summary
This study demonstrates the feasibility of a novel implantable hearing device using cerebrospinal fluid to conduct sound waves to the inner ear. This innovative approach offers potential advantages for hearing restoration, especially in cases of middle ear infections.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Otolaryngology
Background:
- Traditional implantable hearing devices often require coupling to the ossicular chain.
- Middle ear infections can complicate the use of existing hearing implant technologies.
Purpose of the Study:
- To assess the feasibility of a new implantable hearing device concept.
- To investigate sound wave transmission via a cerebrospinal fluid (CSF) hydroacoustic pathway.
Main Methods:
- A prospective animal study involving 2 guinea pigs and 1 dog.
- Implantation of a piezoelectric bimorph device between the skull bone and dura mater.
- Auditory brainstem response (ABR) recording following device stimulation.
Main Results:
- Auditory brainstem responses were successfully recorded in all animals after stimulation.
- The ABRs confirmed sound transmission to the inner ear via the CSF pathway.
- Stimulation thresholds ranged from 115 to 135 dB peak equivalent sound pressure level.
Conclusions:
- Transmission of sound waves through a CSF hydroacoustic pathway to the inner ear is feasible.
- This novel approach bypasses the need for ossicular chain coupling.
- Potential for use in patients with middle ear pathologies, including infections.