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Cochlear reimplantation

T J Woolford¹, S R Saeed, P Boyd

¹University Department of Otolaryngology, Manchester Royal Infirmary, England.

The Annals of Otology, Rhinology & Laryngology. Supplement

|September 1, 1995

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Revision surgery for cochlear implants is rare but necessary in specific cases. This study details three cochlear implant revisions due to device failure, temperature instability, and incorrect electrode placement.

Area of Science:

Otolaryngology
Biomedical Engineering
Neurosurgery

Background:

The Cochlear Implant Programme in Manchester has provided 76 cochlear implant surgeries since 1988.
Revision surgery is uncommon, with only 3 cases out of 76 patients requiring further intervention.

Observation:

Case 1: A Nucleus cochlear implant failed due to an electric shock, necessitating reimplantation.
Case 2: A Nucleus 22-channel device was revised due to audiologic performance fluctuations and suspected temperature-related instability.
Case 3: An Ineraid multichannel device required revision due to incorrect electrode placement discovered post-surgery.

Findings:

Device failure in Case 1 was attributed to a capacitor malfunction.
Manufacturer analysis suggested the implant in Case 2 was unstable at higher temperatures.

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Electrode malpositioning across the promontory was identified as the cause for revision in Case 3.

Implications:

These cases highlight the importance of device reliability and proper surgical technique in cochlear implantation.
Understanding failure modes can inform future device design and surgical protocols.
Successful revision surgeries can restore or improve auditory function in patients with initial implant issues.