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The Scientific World Journal
Volume 2012 (2012), Article ID 126767, 4 pages
http://dx.doi.org/10.1100/2012/126767
Research Article

Advances to Electrode Pullback in Cochlear Implant Surgery

Department of Otolaryngology, Unfallkrankenhaus Berlin, 12683 Berlin, Germany

Received 3 September 2012; Accepted 24 September 2012

Academic Editors: T. J. Balkany, J. Gavilán, and Y. Noguchi

Copyright © 2012 Ingo Todt et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective. To observe the intracochlear behavior of a cochlear implant electrode insertion technique (called “pullback”) in temporal bones. Study Design. Experimental. Settings. Tertiary referral center. Method. The change of the intracochlear electrode position was investigated under various conditions of an electrode pullback ( ) in 9 radiologically, size-estimated temporal bones (TBs). Those TBs were prepared by removal of the cochlear scalar roof to apply digital video capture procedures to monitor the pullback procedures. The digitally captured pictures were analyzed with specific software. Results. An optimal pullback of the electrode varied between 1.37 mm and 2.67 mm. While a limited pullback is without risk, an extended pullback bears the risk of removing the electrode tip out of its initial position or out of the cochlea. A correlation between cochlear size and the amount of pullback was not found. Conclusion. An initial insertion to the first or the second marker on the electrode followed by a limited pullback of about 1.37 mm to 1.5 mm can be recommended to achieve an optimized perimodiolar position. A pullback of up to two marker positions bears the risk of removing the electrode tip out of its initial position.