On the Intracochlear Location of Straight Electrode Arrays After Cochlear Implantation

Cochlear implantation is indicated in patients with severe to profound hearing loss that cannot be adequately treated by other auditory rehabilitation measures. The definitive indication of cochlear implantation is made on the basis of an extensive interdisciplinary clinical, audiological, radiological, and psychological diagnostic work-up. There are numerous changes are happening in cochlear implant candidacy. These have been associated with concomitant changes in surgical techniques, which enhanced the utility and safety of cochlear implantation. Currently, cochlear implants are approved for individuals with severe to profound unilateral hearing loss rather than previously needed for bilateral profound hearing loss. Studies have begun using the short electrode arrays for shallow insertion in patients with low-frequency residual hearing loss. The advancement in designs of the cochlear implant along with improvements in surgical techniques reduce the complications and result in the safety and efficacy of the cochlear implant which further encourages the use of these devices. This review article aims to discuss the new concepts in the candidacy of the cochlear implant, cochlear implant in younger children and hearing preservation, a cochlear implant for unilateral deafness, bilateral cochlear implant, and cochlear implant with neural plasticity and selection of patients for the cochlear implant.

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Effects of Electrode Array Length on Frequency-Place Mismatch and Speech Perception with Cochlear Implants

Audiology and Neurotology ◽

10.1159/000369333 ◽

2015 ◽

Vol 20 (2) ◽

pp. 102-111 ◽

Cited By ~ 15

Author(s):

Frederic Venail ◽

Caroline Mathiolon ◽

Sophie Menjot de Champfleur ◽

Jean Pierre Piron ◽

Marielle Sicard ◽

...

Keyword(s):

Speech Perception ◽

Cochlear Implants ◽

Cochlear Implantation ◽

Electrode Array ◽

Electrode Arrays ◽

Frequency Map

Frequency-place mismatch often occurs after cochlear implantation, yet its effect on speech perception outcome remains unclear. In this article, we propose a method, based on cochlea imaging, to determine the cochlear place-frequency map. We evaluated the effect of frequency-place mismatch on speech perception outcome in subjects implanted with 3 different lengths of electrode arrays. A deeper insertion was responsible for a larger frequency-place mismatch and a decreased and delayed speech perception improvement by comparison with a shallower insertion, for which a similar but slighter effect was noticed. Our results support the notion that selecting an electrode array length adapted to each individual's cochlear anatomy may reduce frequency-place mismatch and thus improve speech perception outcome.

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Facial nerve stimulation after cochlear implantation according to types of Nucleus 24-channel electrode arrays

Acta Oto-Laryngologica ◽

10.1080/00016480802325965 ◽

2009 ◽

Vol 129 (6) ◽

pp. 588-591 ◽

Cited By ~ 14

Author(s):

Joong Ho Ahn ◽

Soo Hee Oh ◽

Jong Woo Chung ◽

Kwang-Sun Lee

Keyword(s):

Facial Nerve ◽

Nerve Stimulation ◽

Cochlear Implantation ◽

Electrode Arrays ◽

Facial Nerve Stimulation ◽

Channel Electrode ◽

Nucleus 24

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Electrophysiological Findings in Two Bilateral Cochlear Implant Cases: Does the Duration of Deafness Affect Electrically Evoked Auditory Brain Stem Responses?

Annals of Otology Rhinology & Laryngology ◽

10.1177/000348940211101111 ◽

2002 ◽

Vol 111 (11) ◽

pp. 1008-1014 ◽

Cited By ~ 16

Author(s):

Hung Thai-Van ◽

Stéphane Gallego ◽

Evelyne Veuillet ◽

Eric Truy ◽

Lionel Collet

Keyword(s):

Brain Stem ◽

Cochlear Implantation ◽

Total Duration ◽

The Other ◽

Electrode Arrays ◽

Speech Processor ◽

Auditory Brain Stem Responses ◽

Auditory Brain Stem ◽

Neural Transmission

Bilateral cochlear implantation provides an interesting model for in vivo study of the effect of long-term profound deafness on neural transmission. We present electrophysiological observations on 2 patients implanted with the MXM Binaural Digisonic Convex system. This uncommon design consists of 2 electrode arrays placed bilaterally into the scala tympani and controlled by a single speech processor. In both patients, the duration of deafness before cochlear implantation clearly differed from one ear to the other. Electrically evoked auditory brain stem responses (EABRs) were measured and the EABRs from the ear with the longer deafness duration showed a lengthening of wave V latency. In 1 patient, recordings from this ear also showed a lack of reproducibility of wave III. The data suggest that neural responsiveness in the peripheral and intermediate auditory pathways is adversely affected by deafness duration. Poor EABRs on one ear possibly result from the total duration of deafness in this ear and/or compensation by the other ear.

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Minimizing Intracochlear Pressure: Influence of the Insertion Sheath

Audiology and Neurotology ◽

10.1159/000512466 ◽

2021 ◽

pp. 1-6

Author(s):

Ceyhun Ucta ◽

Philipp Mittmann ◽

Arneborg Ernst ◽

Rainer Seidl ◽

Gina Lauer

Keyword(s):

Optical Sensor ◽

Cochlear Implantation ◽

Apical Part ◽

Electrode Arrays ◽

Insertion Technique ◽

Cochlear Model ◽

Electrode Insertion ◽

Intracochlear Pressure ◽

Pressure Changes

Objective: Atraumatic cochlear implantation (CI) and insertion of the electrode in particular are major goals of recent CI surgery. Perimodiolar electrode arrays need a stylet or exosheath for insertion. The sheath can influence the intracochlear pressure changes during insertion of the electrode. The aim of this study was to modify the insertion sheath to optimize intracochlear pressure changes. Methods: In an artifical cochlear model, 7 different modified insertion sheaths were used. The intracochlear pressure was measured with a micro-optical sensor in the apical part of the model cochlea. Results: Significant lower intracochlear pressure changes were observed when the apical part of the insertion sheath was either shortened or tapered. Modification of the stopper does influence the intracochlear pressure significantly. Conclusion: Modification of the insertion sheath leads to lower intracochlear pressure gain. The differences and impact on intracochlear pressure changes found in this study underline the importance of even subtle modifications of the electrode insertion technique.

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