Optimal electrode diameter in relation to volume of the cochlea - 20/06/16

Doi : 10.1016/j.anorl.2016.04.013

D. Gnansia ^a,^⁎ , T. Demarcy ^b, C. Vandersteen ^c, C. Raffaelli ^d, N. Guevara ^c, H. Delingette ^b, N. Ayache ^b
^a Oticon Medical CI, Clinical and Scientific Research, 2720, Chemin St.-Bernard, Vallauris, France
^b Asclepios Project Team, Inria Sophia Antipolis-Mediterranee Research Centre, Sophia Antipolis, France
^c Head and Neck Surgery University Institute, Nice University Hospital, Nice, France
^d Department of Radiology, Nice University Hospital, Nice, France

^⁎Corresponding author. Tel.: +33 49 39 51 81 8.

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Abstract

The volume of the cochlea is a key parameter for electrode-array design. Indeed, it constrains the diameter of the electrode-array for low-traumatic positioning in the scala timpani. The present report shows a model of scala timpani volume extraction from temporal bones images in order to estimate a maximum diameter of an electrode-array. Nine temporal bones were used, and passed to high-resolution computed tomography scan. Using image-processing techniques, scala timpani were extracted from images, and cross-section areas were estimated along cochlear turns. Cochlear implant electrode-array was fitted in these cross-sections. Results show that the electrode-array diameter is small enough to fit in the scala timpani, however the diameter is restricted at the apical part.

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Keywords : Cochlear implant, Electrode-array, Hearing preservation, Soft surgery, Electrode-array design, Image processing, Computed tomography, Inner ear, Anatomy