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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: May 9, 2025

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

Published on: August 4, 2023

Evaluating Patient Motivation Behind Device Removal in Cochlear Implant Patients.

Robert J Macielak¹, Lisa Zhang¹, Diana Hallak²

¹Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|May 1, 2025

Summary

Cochlear implant (CI) removal without re-implantation is uncommon, often due to non-audiologic symptoms or complications. Patients not re-implanted had poorer hearing outcomes, impacting their decision to proceed.

Keywords:

Cochlear implant Device removal Explantation Patient motivation

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Last Updated: May 9, 2025

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

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Published on: August 4, 2023

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

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Published on: March 24, 2023

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

Published on: June 21, 2024

Area of Science:

Otolaryngology
Biomedical Engineering
Audiology

Background:

Cochlear implantation (CI) is a common treatment for severe to profound hearing loss.
Implant removal (explantation) is rare, and reasons for explantation without re-implantation require further investigation.

Purpose of the Study:

To investigate the indications for cochlear implant (CI) explantation without subsequent re-implantation.
To analyze patient demographics and audiometric outcomes associated with CI explantation.

Main Methods:

Retrospective review of patients undergoing CI explantation between January 2013 and December 2022.
Analysis of indications for explantation, including infectious and non-infectious causes.
Comparison of audiometric performance (AzBio, CNC) between patients who were and were not re-implanted.

Main Results:

Of 743 CI patients, 35 (5%) had implant revision. 16 patients (2%) underwent explantation without re-implantation.
Infectious complications (37.5%) and non-audiologic symptoms (38%) were primary reasons for explantation without re-implantation.
Patients not re-implanted showed significantly worse AzBio (p=0.10) and CNC (p=0.02) test results compared to those re-implanted.

Conclusions:

Reasons for cochlear implant explantation without re-implantation are diverse, with ill-defined symptoms being most common.
Poor audiometric outcomes post-initial implantation may deter patients from undergoing re-implantation.
Understanding these indications is crucial for managing CI device complications and patient expectations.