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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: Jun 29, 2026

Performing Intracochlear Electrocochleography During Cochlear Implantation

Performing Intracochlear Electrocochleography During Cochlear Implantation

Published on: March 8, 2022

The advanced Combi 40+ cochlear implant

C M Zierhofer¹, I J Hochmair, E S Hochmair

¹Institute for Applied Physics/Microelectronics, University of Innsbruck, Austria.

The American Journal of Otology

|December 10, 1997

Summary

This study introduces a 12-channel cochlear implant (CI) capable of high-rate pulsatile stimulation. The device enables precise control over stimulation parameters and includes advanced features like self-calibrating telemetry for improved auditory prosthetics.

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Last Updated: Jun 29, 2026

Performing Intracochlear Electrocochleography During Cochlear Implantation

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Published on: March 8, 2022

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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

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Published on: March 24, 2023

Area of Science:

Biomedical Engineering
Neuroscience
Audiology

Background:

Cochlear implants (CIs) are vital for restoring hearing in individuals with severe to profound sensorineural hearing loss.
Advancements in CI technology focus on enhancing speech perception and sound quality through improved stimulation strategies.
High-rate pulsatile stimulation offers potential benefits for more natural auditory processing.

Purpose of the Study:

To present a novel 12-channel cochlear implant (CI) designed for high-rate pulsatile stimulation strategies.
To detail the technical specifications and capabilities of the developed CI system.
To introduce integrated features for enhanced performance and safety.

Main Methods:

Development of a 12-channel CI system capable of generating symmetric biphasic current pulses up to 18.18 kpulses/second.
Implementation of transcutaneous data and power transfer via a single radiofrequency (RF) channel at 600 kBit/second.
Integration of a mixed analog/digital CMOS-ASIC for stimulus generation and a self-calibrating back telemetry system.

Main Results:

The CI system supports stimulation pulse amplitudes from 1.5 microA to 1.5 mA.
A fully digital data transfer format and a single RF channel facilitate efficient data and power transmission.
The implant includes safety features like output capacitors and a telemetry system for impedance and field distribution estimation.
The compact ceramic package measures 33.50 x 23.40 x 3.95 mm3.

Conclusions:

The presented 12-channel CI is a sophisticated auditory prosthetic device optimized for high-rate pulsatile stimulation.
The integrated digital data transfer, RF power/data link, and self-calibrating telemetry represent significant technological advancements.
This CI technology holds promise for improving hearing restoration outcomes and addressing the needs of CI users.