Cochlear implant array insertion forces are potentially related to cochlear trauma. We compared these forces between a standard (Digisonic SP; Neurelec, Vallauris, France) and an array prototype (Neurelec) with a smaller diameter. The arrays were inserted by a mechatronic tool in 23 dissected human cochlea specimens exposing the basilar membrane. The array progression under the basilar membrane was filmed together with dynamic force measurements. Insertion force profiles and depth of insertion were compared. The recordings showed lower insertion forces beyond 270° of insertion and deeper insertions with the thin prototype array. This will potentially allow larger cochlear coverage with less trauma.

Adunka O, Kiefer J: Impact of electrode insertion depth on intracochlear trauma. Otolaryngol Head Neck Surg 2006;135:374–382.
Blamey P, Arndt P, Bergeron F, Bredberg G, Brimacombe J, Facer G, Larky J, Lindstrom B, Nedzelski J, Peterson A, Shipp D, Staller S, Whitford L: Factors affecting auditory performance of postlinguistically deaf adults using cochlear implants. Audiol Neurootol 1996;1:293–306.
Clark GM: Electrical stimulation of the auditory nerve: the coding of frequency, the perception of pitch and the development of cochlear implant speech processing strategies for profoundly deaf people. Clin Exp Pharmacol Physiol 1996;23:766–776.
Eshraghi AA, Yang NW, Balkany TJ: Comparative study of cochlear damage with three perimodiolar electrode designs. Laryngoscope 2003;113:415–419.
Gomaa NA, Rubinstein JT, Lowder MW, Tyler RS, Gantz BJ: Residual speech perception and cochlear implant performance in postlingually deafened adults. Ear Hear 2003;24:539–544.
Huttenbrink KB, Zahnert T, Jolly C, Hofmann G: Movements of cochlear implant electrodes inside the cochlea during insertion: an x-ray microscopy study. Otol Neurotol 2002;23:187–191.
Ishii T, Takayama M, Takahashi Y: Mechanical properties of human round window, basilar and Reissner’s membranes. Acta Otolaryngol Suppl 1995;519:78–82.
Kiefer J, Gstoettner W, Baumgartner W, Pok SM, Tillein J, Ye Q, von Ilberg C: Conservation of low-frequency hearing in cochlear implantation. Acta Otolaryngol 2004;124:272–280.
Lazard DS, Bordure P, Lina-Granade G, Magnan J, Meller R, Meyer B, Radafy E, Roux PE, Gnansia D, Pean V, Truy E: Speech perception performance for 100 post-lingually deaf adults fitted with neurelec cochlear implants: comparison between digisonic(r) convex and digisonic(r) sp devices after a 1-year follow-up. Acta Otolaryngol 2010;130:1267–1273.
Lehnhardt E: Intracochlear placement of cochlear implant electrodes in soft surgery technique (in German). HNO 1993;41:356–359.
Majdani O, Schurzig D, Hussong A, Rau T, Wittkopf J, Lenarz T, Labadie RF: Force measurement of insertion of cochlear implant electrode arrays in vitro: comparison of surgeon to automated insertion tool. Acta Otolaryngol 2010;130:31–36.
Radeloff A, Unkelbach MH, Mack MG, Settevendemie C, Helbig S, Mueller J, Hagen R, Mlynski R: A coated electrode carrier for cochlear implantation reduces insertion forces. Laryngoscope 2009;119:959–963.
Roland JT Jr: A model for cochlear implant electrode insertion and force evaluation: results with a new electrode design and insertion technique. Laryngoscope 2005;115:1325–1339.
Wardrop P, Whinney D, Rebscher SJ, Luxford W, Leake P: A temporal bone study of insertion trauma and intracochlear position of cochlear implant electrodes. II. Comparison of spiral clarion and hifocus ii electrodes. Hear Res 2005a;203:68–79.
Wardrop P, Whinney D, Rebscher SJ, Roland JT Jr, Luxford W, Leake PA: A temporal bone study of insertion trauma and intracochlear position of cochlear implant electrodes. I. Comparison of nucleus banded and nucleus contour electrodes. Hear Res 2005b;203:54–67.
Wilson BS, Dorman MF: Cochlear implants: a remarkable past and a brilliant future. Hear Res 2008;242:3–21.
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