Interactions between cochlear implant electrode insertion depth and frequency-place mapping

2005 ◽  
Vol 117 (3) ◽  
pp. 1405-1416 ◽  
Author(s):  
Deniz Başkent ◽  
Robert V. Shannon
Keyword(s):  
Cochlear Implant ◽  
Insertion Depth ◽  
Electrode Insertion

Evaluating Intracochlear Trauma after Cochlear Implant Electrode Insertion through Middle Fossa Approach in Temporal Bones

2017 ◽  
Vol 158 (2) ◽  
pp. 350-357 ◽  
Author(s):  
Juan Carlos Cisneros Lesser ◽  
Rubens de Brito ◽  
Graziela de Souza Queiroz Martins ◽  
Eloisa Maria Mello Santiago Gebrim ◽  
Ricardo Ferreira Bento
Keyword(s):  
Cochlear Implant ◽  
Round Window ◽  
Middle Cranial Fossa ◽  
Middle Fossa ◽  
Insertion Depth ◽  
Middle Fossa Approach ◽  
Basal Turn ◽  
Fresh Frozen ◽  
Electrode Insertion ◽  
Temporal Bones

Objective To evaluate cochlear trauma after cochlear implant insertion through a middle fossa approach by means of histologic and imaging studies in temporal bones. Study Design Prospective cadaveric study. Setting University-based temporal bone laboratory. Subjects and Methods Twenty fresh-frozen temporal bones were implanted through a middle cranial fossa basal turn cochleostomy. Ten received a straight electrode and 10 a perimodiolar electrode. Samples were fixed in epoxy resin. Computed tomography (CT) scans determined direction, depth of insertion, and the cochleostomy to round window distance. The samples were polished by a microgrinding technique and microscopically visualized to evaluate intracochlear trauma. Descriptive and analytic statistics were performed to compare both groups. Results The CT scan showed intracochlear insertions in every bone, 10 directed to the middle/apical turn and 10 to the basal turn. In the straight electrode group, the average number of inserted electrodes was 12.3 vs 15.1 for the perimodiolar group ( U = 78, P = .0001). The median insertion depth was larger for the perimodiolar group (14.4 mm vs 12.5 mm, U = 66, P = .021). Only 1 nontraumatic insertion was achieved and 14 samples (70%) had important trauma (Eshraghi grades 3 and 4). No differences were identified comparing position or trauma grades for the 2 electrode models or when comparing trauma depending on the direction of insertion. Conclusion The surgical technique allows a proper intracochlear insertion, but it does not guarantee a correct scala tympani position and carries the risk of important trauma to cochlear microstructures.

scholarly journals Angular Electrode Insertion Depth and Speech Perception in Adults With a Cochlear Implant

2019 ◽  
Vol 40 (7) ◽  
pp. 900-910 ◽  
Author(s):  
Floris Heutink ◽  
Simone R. de Rijk ◽  
Berit M. Verbist ◽  
Wendy J. Huinck ◽  
Emmanuel A. M. Mylanus
Keyword(s):  
Speech Perception ◽  
Cochlear Implant ◽  
Insertion Depth ◽  
Electrode Insertion

scholarly journals Prediction of the Cochlear Implant Electrode Insertion Depth: Clinical Applicability of two Analytical Cochlear Models

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
G. Mertens ◽  
V. Van Rompaey ◽  
P. Van de Heyning ◽  
E. Gorris ◽  
V. Topsakal
Keyword(s):  
Cochlear Implant ◽  
Insertion Depth ◽  
Clinical Applicability ◽  
Electrode Insertion

The “pull-back” technique for Nucleus 24 perimodiolar electrode insertion

2005 ◽  
Vol 132 (5) ◽  
pp. 751-754 ◽  
Author(s):  
Ingo Todt ◽  
Dietmar Basta ◽  
Andreas Eisenschenk ◽  
Arne Ernst
Keyword(s):  
Cochlear Implant ◽  
Compound Action Potential ◽  
Insertion Depth ◽  
X Ray ◽  
Tertiary Referral Center ◽  
Neural Response Telemetry ◽  
Electrophysiological Recordings ◽  
Spread Of Excitation ◽  
Electrode Insertion ◽  
Nucleus 24

OBJECTIVE: To observe the influence of electrode pull-back after cochlear implant insertion of Nucleus 24 perimodiolar electrodes. STUDY DESIGN: In a prospective intraoperative study, we analyzed the impedances, neural response telemetry responses, and the spread of excitation after cochlear implant electrode insertion and compared these data to those obtained after a subsequent, controlled pull-back of the electrode. Postoperative depth of electrode insertion was controlled by x-ray. SETTING: Tertiary referral center. SUBJECTS: Six patients (4 male, 2 female; 18 to 69 years) were implanted with a Nucleus 24 (RCA) cochlear implant with a perimodiolar electrode. RESULTS: After a controlled pull-back, a significant decrease of the spread of excitation at the stimuli electrodes 5, 10, 15, and a nonsignificant decrease at stimuli electrode 20 compared to the recordings after the primary normal insertion procedure was found. The mean electric compound action potential amplitude was increased with an apical-to-basal tendency. Impedances remained unchanged by the pull-back. Mean insertion depth at the postoperative x-ray control was 372 degrees (± 10.2). CONCLUSION: Controlled cochlear implant electrode pull-back is a novel technique that optimizes objective intraoperative electrophysiological recordings in patients implanted with a Nucleus 24 perimodiolar cochlear implant by a greater approximation of the electrode to the modiolus. (Otolaryngol Head Neck Surg 2005;132:751-4.)

scholarly journals Patterns Seen During Electrode Insertion Using Intracochlear Electrocochleography Obtained Directly Through a Cochlear Implant

2017 ◽  
Vol 38 (10) ◽  
pp. 1415-1420 ◽  
Author(s):  
Michael S. Harris ◽  
William J. Riggs ◽  
Christopher K. Giardina ◽  
Brendan P. O’Connell ◽  
Jourdan T. Holder ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Electrode Insertion

scholarly journals Speech understanding dependent from Electrode Insertion depth within CI recipients

2018 ◽  
Author(s):  
A Lesinski-Schiedat ◽  
D Manecke ◽  
E Kludt ◽  
T Lenarz ◽  
E Bültmann
Keyword(s):  
Speech Understanding ◽  
Insertion Depth ◽  
Electrode Insertion

scholarly journals Impact of Intrascalar Electrode Location, Electrode Type, and Angular Insertion Depth on Residual Hearing in Cochlear Implant Patients

2015 ◽  
Vol 36 (8) ◽  
pp. 1343-1348 ◽  
Author(s):  
George B. Wanna ◽  
Jack H. Noble ◽  
Rene H. Gifford ◽  
Mary S. Dietrich ◽  
Alex D. Sweeney ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Residual Hearing ◽  
Insertion Depth ◽  
Electrode Location

Cochlear Implant Revision: Effects of Reimplantation on the Cochlea

1989 ◽  
Vol 98 (10) ◽  
pp. 813-820 ◽  
Author(s):  
Robert K. Jackler ◽  
Patricia A. Leake ◽  
William S. McKerrow
Keyword(s):  
Adverse Effects ◽  
Cochlear Implant ◽  
Round Window ◽  
Neural Population ◽  
Scala Tympani ◽  
New Device ◽  
Adult Cats ◽  
Electrode Insertion ◽  
Window Area ◽  
Reimplantation Procedure

The removal of an indwelling cochlear implant electrode followed by reinsertion of a new device has been a maneuver of uncertain cosequences to the cochlea and its surviving neural population. The present study was conducted in an attempt to elucidate the factors at determine whether a reimplantation procedure will be successful. Cochlear implantation followed by explanation and subsequent implantation was performed in eight adult cats. Evaluation of cochlear histopathology suggested a significant increase in electrode insertion trauma when there was proliferation of granulation tissue in the round window area and scala tympani. In other cases, atraumatic insertion was achieved without apparent injury to the cochlea. The results of a survey of cochlear implant manufacturers and surgeons indicate that electrode replacement can usually be accomplished without adverse effects. Difficulties have been encountered, however, in moving implants with protuberant electrodes and when reimplantation was attempted on a delayed basis following explanation.

scholarly journals Effectiveness of skull X-RAY to determine cochlear implant insertion depth

2018 ◽  
Vol 47 (1) ◽  
Author(s):  
Vinay Fernandes ◽  
Yiqiao Wang ◽  
Robert Yeung ◽  
Sean Symons ◽  
Vincent Lin
Keyword(s):  
Cochlear Implant ◽  
Insertion Depth ◽  
X Ray
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