“Rounded Insertion”

Chen, Joshua Kuang‐Chao; Hu, Hao-Chun; Kuo, Chin‐Lung; Li, Lieber Po‐Hung

doi:10.1177/0194599816631514

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…Cochlear implantation is an important surgical technique for patients with severe to profound sensorineural hearing loss, and even in patients with inner ear malformation [1, 2]. Hearing/speech performance and music perception can be improved after surgery [3, 4].…”

Section: Introductionmentioning

confidence: 99%

Evolution of impedance field telemetry after one day of activation in cochlear implant recipients

Chen

Tsai

et al. 2017

PLoS ONE

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ObjectivesChanges in impedance between 24 hours and one month after cochlear implantation have never been explored due to the inability to switch on within one day. This study examined the effect of early activation (within 24 hours) on the evolution of electrode impedance with the aim of providing information on the tissue-to-electrode interface when electrical stimulation was commenced one day post implantation.MethodsWe performed a retrospective review at a single institution. Patients who received a Nucleus 24RECA implant system (Cochlear, Sydney, Australia) and underwent initial switch-on within 24 hours postoperatively were included. Impedance measurements were obtained intraoperatively and postoperatively at 1 day, 1 week, 4 weeks, and 8 weeks.ResultsA significant drop in impedance was noted 1 day after an initial activation within 24 hours followed by a significant rise in impedance in all channels until 1 week, after which the impedance behaved differently in different segments. Basal and mid-portion electrodes revealed a slight increase while apical electrodes showed a slight decrease in impedance from 1 week to 8 weeks postoperatively. Impedance was relatively stable 4 weeks after surgery.ConclusionsThis is the first study to report the evolution of impedance in all channels between initial mapping 1 day and 1 month after cochlear implantation. The underlying mechanism for the differences in behavior between different segments of the electrode may be associated with the combined effect of dynamics among the interplay of cell cover formation, electrical stimulation, and fibrotic reaction.

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Section: Introductionmentioning

confidence: 99%

Evolution of impedance field telemetry after one day of activation in cochlear implant recipients

Chen

Tsai

et al. 2017

PLoS ONE

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“…The incidence of cochlear implantation has increased throughout the world over the past few decades, and it is considered one of the best medical interventions for patients with severe to profound sensorineural hearing loss. Over the last few years, Cheng Hsin General Hospital have routinely performed successful initial cochlear implant switch-on within 24 hours of their implantation [1–5].…”

Section: Introductionmentioning

confidence: 99%

Differences in the impedance of cochlear implant devices within 24 hours of their implantation

et al. 2019

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Cochlear implantation is a surgical procedure, which is performed on severely hearing-impaired patients. Impedance field telemetry is commonly used to determine the integrity of the cochlear implant device during and after surgery. At the Department of Otolaryngology, Cheng Hsin General Hospital (Taipei, Taiwan), the cochlear implant devices are switched on within 24 hours of their implantation. In the present study, the impedance changes of Advanced Bionics™ cochlear implant devices were compared with previous studies and other devices. The aim was to confirm previous hypotheses and to explore other potential associated factors that could influence impedance following cochlear implantation. The current study included 12 patients who underwent cochlear implantation at Cheng Hsin General Hospital with Advanced Bionics cochlear implant devices. The cochlear devices were all switched on within 24 hours of their implantation. The impedance was measured and compared across all contact channels of the electrode, both intra-operatively and post-operatively. The intra-operative impedance was compared with the switch-on impedance (within 24 hours of the cochlear implantation); the impedance was notably increased for all contact channels at switch-on. Of the 16 channels examined, 4 channels had a significant increase in impedance between the intra-operative measurement and the switch-on measurement. To the best of our knowledge, the impedance of a cochlear implant device can be affected by the diameter of the electrode, the position of the electrode arrays in the scala tympani, sheath formation and fibrosis surrounding the electrode after implantation and electrical stimulation during or after surgery. When the results of the current study were compared with previous studies, it was found that the impedance changes were opposite to that of Cochlear™ implant devices. This may be explained by the position of the electrode arrays, sheath formation, the blow-out effect and differences in electrical stimulation.

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Rounded Insertion Technique for Cochlear Implantation Surgery to Treat Cystic Inner Ear Malformation

Chen

Huang

et al. 2019

The Laryngoscope

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ObjectiveThis article outlines the advantages and applicability of the rounded insertion technique of cochlear implants in patients with cystic inner ear malformation. This technique enables the insertion of the maximum number of electrodes and prevents the unwanted entry of electrodes into the internal auditory canal.MethodsWe conducted a retrospective chart review of consecutive patients with cochlear hypoplasia (CH) and/or common cavity (CC) who underwent CI (cochlear implantation) via rounded insertion technique. The position of the electrode array in each patient was confirmed postoperatively via X‐ray, and the number of functional electrodes was confirmed during the mapping process.ResultsThis study included five male and two female patients (median age: 3 years; age range: 2–7 years). Among the seven patients, four received a cochlear implant on the right side, one on the left side, and two bilaterally. Of the nine ears, six were cases of CH, and three were CC. All cochlear implant surgeries via rounded insertion technique were completed without complications. The maximum number of electrode contacts with fair function in the cystic cochlea was confirmed via postoperative X‐ray and the subsequent mapping process.ConclusionThis consecutive series of patients demonstrated the safety and reliability of rounded insertion technique for CI in patients with CH and/or CC.Level of Evidence4 Laryngoscope, 130:2229–2233, 2020

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“Rounded Insertion”

Abstract: No sponsorships or competing interests have been disclosed for this article.

Cited by 6 publications

References 6 publications

Evolution of impedance field telemetry after one day of activation in cochlear implant recipients

Evolution of impedance field telemetry after one day of activation in cochlear implant recipients

Differences in the impedance of cochlear implant devices within 24 hours of their implantation

Rounded Insertion Technique for Cochlear Implantation Surgery to Treat Cystic Inner Ear Malformation

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