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Electrophysiological effects of slim straight intracochlear electrode position

Published online by Cambridge University Press:  09 December 2020

F Ordonez ,
H Sudhoff  and
I Todt
F Ordonez
Affiliation:
Department of Otolaryngology – Head and Neck Surgery, Klinikum Bielefeld, Bielefeld University, Germany Department of Otolaryngology – Head and Neck Surgery, Charité Medical University (Campus-Mitte), Berlin, Germany
H Sudhoff
Affiliation:
Department of Otolaryngology – Head and Neck Surgery, Klinikum Bielefeld, Bielefeld University, Germany
I Todt*
Affiliation:
Department of Otolaryngology – Head and Neck Surgery, Klinikum Bielefeld, Bielefeld University, Germany Department of Otolaryngology – Head and Neck Surgery, Charité Medical University (Campus-Mitte), Berlin, Germany
*
Author for correspondence: Dr Ingo Todt, Bielefeld University, Klinikum Bielefeld Mitte, Department of Otolaryngology, Head and Neck Surgery, Teutoburgerstr. 50, 33604Bielefeld, Germany E-mail: todt@gmx.net Fax: +49 521 581 3303
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Abstract

Objective

The electrical current distribution of a cochlear implant electrode within the cochlea is essential for post-operative hearing performance. The slim straight electrode is designed to enable the placement of contacts in a lateral or medial direction to the modiolus. The electrophysiological effect of this different contact direction is so far unknown. The aim of this study was to determine the influence of intracochlear laterally or medially directed electrode contacts on electrophysiological behaviour.

Method

A slim straight electrode was inserted into the cochleae of five patients, and the neural response threshold was measured in a laterally and medially directed contact position. The cochleae in five temporal bone specimens were de-capped allowing an insertional observation of the contact position (lateral versus medial) of the electrode.

Results

There was no difference in neural response threshold between a lateral and a medial position of the contacts. Temporal bone study indicated no intracochlear torsion of the electrode.

Conclusion

Our study provides evidence that the intracochlear position of slim straight electrode contacts does not affect the neural response threshold.

Keywords

ElectrophysiologyTelemetryCochlear ImplantsElectrodes
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 134 , Issue 12 , December 2020 , pp. 1077 - 1080
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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Footnotes

‡

The online version of this article has been updated since original publication. A notice detailing the changes has also been published at https://doi.org/10.1017/S0022215122000342.

Dr I Todt takes responsibility for the integrity of the content of the paper

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