Cochlear Implants

A cochlear implant is a surgically implanted device that sends sound information via electrical stimulation directly to the auditory nerve, bypassing the damaged, missing or non-functioning sensory receptors (hair cells) located within the inner ear.

In order to have access to environmental sounds and speech information, a person with a cochlear implant must wear an external sound processor (either a body-worn, pager-sized model or a behind-the-ear model) and microphone. Sound is picked up at the level of the microphone and sent to the sound processor where the sound signals are converted into digital signals. These digitized signals are then delivered to an internal electrode array that was surgically placed in the cochlea (in the inner ear). Contacts on this electrode array electrically stimulate hearing nerve fibers which, in turn, carry the signals to the brain where they are "heard."

See also: Massachusetts Eye and Ear Infirmary Patient Information on Cochlear Implants

Who is a candidate?

Cochlear implants have received FDA approval for use in adults with severe or profound sensorineural hearing loss in both ears who receive little or no benefit from the use of hearing aids. They are similarly approved for children 12 months of age or older who have profound hearing loss in both ears, and who receive little or no benefit from hearing aids.

Cochlear implant candidates at the Massachusetts Eye and Ear Infirmary undergo a thorough medical and audiologic evaluation as well as radiological imaging (CT scan), and psychosocial evaluation. Pediatric patients also have a speech/language or educational evaluation as part of the assessment process.

All candidates' cases are subject to approval by a multi-disciplinary Cochlear Implant Review Board prior to proceeding with surgery. For more information regarding possible candidacy for cochlear implantation for yourself or a family member, contact the Audiology Department at (617) 573-3266.

The MEEI Cochlear Implant Program

The Massachusetts Eye and Ear Infirmary is equipped to manage the full range of services for adult and pediatric patients.

Examples of cochlear implants.

Individuals with cochlear implants may be seen for evaluation, device programming, maintenance and follow-up at our offices in Boston or our satellite center in Stoneham, MA.

content updated: 12/13/05