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The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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Related Experiment Video

Updated: Apr 26, 2026

Performing Intracochlear Electrocochleography During Cochlear Implantation

Performing Intracochlear Electrocochleography During Cochlear Implantation

Published on: March 8, 2022

Keyhole cochlear implantation surgery.

¹Department of Otolaryngology, Royal Children's Hospital, Brisbane, Queensland, Australia. bruceblackmd@bigpond.com

Cochlear Implants International

|January 8, 2009

Summary

This summary is machine-generated.

A minimally invasive keyhole cochlear implantation (CI) technique uses a small incision and avoids a bony well. This atraumatic approach in 315 cases shows favorable complication rates, especially for infants.

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Last Updated: Apr 26, 2026

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Area of Science:

Otolaryngology
Neurosurgery
Medical Devices

Background:

Cochlear implantation (CI) is a standard treatment for severe to profound hearing loss.
Traditional CI surgeries often involve larger incisions and extensive mastoidectomy.
The need for less invasive surgical techniques, particularly in pediatric cases, is recognized.

Purpose of the Study:

To present a limited access "keyhole" cochlear implantation surgical technique.
To evaluate the safety and efficacy of this technique in a large cohort of patients.
To compare outcomes with traditional CI approaches.

Main Methods:

A C-incision (15-18 mm) behind the auricle was used.
Implants were placed in a pericranial pocket without a bony retention well.
Minimal mastoid cell clearance was performed.
The technique was applied to 315 sequential CI cases between 1997 and 2007.

Main Results:

The keyhole CI surgery was brief and atraumatic.
Complication rates were favorable compared to historical data.
The technique proved well-suited for small infant cases.
Outcomes suggest larger incisions and bony wells may not be necessary.

Conclusions:

The limited access keyhole CI technique is a viable and safe alternative.
This approach offers advantages in terms of reduced surgical trauma and potentially better cosmesis.
Future cochlear implant designs should consider modifications for improved adaptation to cranial contours.