scholarly journals Cochlear Implant Performance after Round Window Insertion

2012 ◽  
Vol 147 (2_suppl) ◽  
pp. P202-P203
Author(s):  
Bryan J. Kang ◽  
Derek Petti ◽  
Ana H. Kim
Keyword(s):  
Cochlear Implant ◽  
Round Window ◽  
Round Window Insertion

X-ray microtomographic confirmation of the reliability of CBCT in identifying the scalar location of cochlear implant electrode after round window insertion

2015 ◽  
Vol 326 ◽  
pp. 59-65 ◽  
Author(s):  
Jing Zou ◽  
Markus Hannula ◽  
Kalle Lehto ◽  
Hao Feng ◽  
Jaakko Lähelmä ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Round Window ◽  
X Ray ◽  
Round Window Insertion

Evaluation of cochlear implant electrode position after a modified round window insertion by means of a 64-multislice CT

2009 ◽  
Vol 129 (9) ◽  
pp. 966-970 ◽  
Author(s):  
Ingo Todt ◽  
Grit Rademacher ◽  
Jan Wagner ◽  
Friederike Göpel ◽  
Dietmar Basta ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Round Window ◽  
Multislice Ct ◽  
Electrode Position ◽  
Round Window Insertion

scholarly journals Comparison of residual hearing preservation and auditory based performance after paediatric cochlear implantation by round window insertion versus cochleostomy technique: an ambispective cohort study

2021 ◽  
Vol 7 (9) ◽  
pp. 1455
Author(s):  
Dayana Antony ◽  
Aneena Chacko ◽  
Ravi A.
Keyword(s):  
Cohort Study ◽  
Cochlear Implant ◽  
Cochlear Implantation ◽  
Round Window ◽  
Tertiary Care ◽  
Sensorineural Deafness ◽  
Hearing Preservation ◽  
Care Hospital ◽  
Residual Hearing ◽  
Round Window Insertion

<p class="abstract"><strong>Background:</strong> Cochlear implantation (CI) has revolutionized the treatment of sensorineural deafness. The aim of the study was to compare auditory based performance in cochlear implants who underwent round window insertion and cochleostomy.</p><p class="abstract"><strong>Methods:</strong> Ambispective cohort study was done among the children who underwent perilingual cochlear implant in a tertiary care hospital for period of 1 year. Children who satisfied the inclusion criteria were selected and randomly subdivided into 2 groups: group A- round window insertion and group B-cochleostomy. Pre- and post-operative pure tone average (PTA) and residual hearing preserved were evaluated among the cochleostomy and round window insertion groups separately. Post-operatively, children were evaluated, from three months to 1 year from the activation of cochlear implant, with the use of scores such as Category of Auditory Performance (CAP), Meaningful Auditory Integration Scale (MAIS), Speech Intelligibility rating (SIR) and Meaningful use of speech scale (MUSS score) to measure speech production skills by auditory verbal therapist.   </p><p class="abstract"><strong>Results:</strong> A total of 80 patients were included in the study. Complete hearing preservation (within 10 dB) was significantly high in round window insertion group compared to   cochleostomy technique (p&lt;0.001). None the subjects had complete loss of residual hearing. On evaluating the post CI performance, MAIS score in the round window insertion group (9.34, 18.21, 27.79) were significantly better compared to cochleostomy group during the 3 months, 6 months and 12 months follow-up.</p><p class="abstract"><strong>Conclusions:</strong> Round window insertion technique is significantly more successful in complete hearing preservation at low frequencies compared to cochleostomy technique. Among the auditory scores, only MAIS in the round window insertion group was found to be significantly better compared to cochleostomy group.</p>

Deep round window insertion versus standard approach in cochlear implant surgery

2014 ◽  
Vol 273 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Karl Fredrik Nordfalk ◽  
Kjell Rasmussen ◽  
Marie Bunne ◽  
Greg Eigner Jablonski
Keyword(s):  
Cochlear Implant ◽  
Round Window ◽  
Standard Approach ◽  
Implant Surgery ◽  
Cochlear Implant Surgery ◽  
Round Window Insertion

scholarly journals The Effects of Round Window Membrane Injury and the Use of a Model Electrode Application on Hearing in Rats

2021 ◽  
pp. 014556132199018
Author(s):  
Murat Koc ◽  
Abdullah Dalgic ◽  
Mehmet Ziya Ozuer
Keyword(s):  
Hearing Loss ◽  
Cochlear Implant ◽  
Round Window ◽  
Mechanical Trauma ◽  
Round Window Membrane ◽  
Albino Rats ◽  
Topical Steroids ◽  
Distortion Product ◽  
Significant Difference ◽  
Group 3

Objective: To investigate the effects of the mechanical trauma to the round window, a model electrode inserted into the scala tympani on the cochlear reserve, and the efficacy of topical steroids in preventing hearing loss. Materials and Methods: 21 male Wistar Albino rats were equally categorized into three groups. In all groups an initial mechanical injury to round window was created. Only subsequent dexamethasone injection was administrated into the cochlea in the subjects of group 2 while a multichannel cochlear implant guide inserted into the cochlea prior to dexamethasone administration for group 3. Distortion product otoacoustic emissions (DPOAEs) were obtained prior to and immediately after the surgical injury, eventually on postoperative seventh day (d 7). Mean signal/noise ratios (S/Ns) obtained at 2000, 3000, and 4000 Hz were calculated. Data sets were compared with non-parametric statistical tests. Results: The early intraoperative mean S/Ns were significantly less than preoperative measurements for group 1 and 2; however, preoperative and postoperative d 7 average S/Ns did not differ. There was statistically significant difference between preoperative, intraoperative and postoperative d 7 average S/Ns for group 3. Conclusion: We observed that hearing was restored approximately to the preoperative levels following early postoperative repair. However, an electrode insertion into the cochlea via round window subsequent to mechanical trauma seems to cause a progressive hearing loss. Therefore, a special care must be taken to avoid the injury to the round window membrane in the course of the placement of a cochlear implant electrode and surgery for the chronic otitis media.

scholarly journals Hydraulic insertions of cochlear implant electrode arrays into the human cadaver cochlea: preliminary findings

2021 ◽  
Author(s):  
M. Geraldine ◽  
Thomas Lenarz ◽  
Thomas S. Rau
Keyword(s):  
Cochlear Implant ◽  
Outcome Measurement ◽  
Round Window ◽  
Handling Time ◽  
Human Cadaver ◽  
Hydraulic Actuator ◽  
Electrode Arrays ◽  
Non Invasive ◽  
Insertion Tool ◽  
Set Up

Abstract Objectives (1) To evaluate the feasibility of a non-invasive, novel, simple insertion tool to perform automated, slow insertions of cochlear implant electrode arrays (EA) into a human cadaver cochlea; (2) to estimate the handling time required by our tool. Methods Basic science study conducted in an experimental OR. Two previously anonymized human cadaver heads, three commercially available EAs, and our novel insertion tool were used for the experiments. Our tool operates as a hydraulic actuator that delivers an EA at continuous velocities slower than manually feasible. Intervention(s): the human cadaver heads were prepared with a round-window approach for CI surgery in a standard fashion. Twelve EA insertion trials using our tool involved: non-invasive fixation of the tool to the head; directing the tool to the round window and EA mounting onto the tool; automated EA insertion at approximately 0.1 mm/s driven by hydraulic actuation. Outcome measurement(s): handling time of the tool; post-insertion cone-beam CT scans to provide intracochlear evaluation of the EA insertions. Results Our insertion tool successfully inserted an EA into the human cadaver cochlea (n = 12) while being attached to the human cadaver head in a non-invasive fashion. Median time to set up the tool was 8.8 (7.2–9.4) min. Conclusion The first insertions into the human cochlea using our novel, simple insertion tool were successful without the need for invasive fixation. The tool requires < 10 min to set up, which is clinically acceptable. Future assessment of intracochlear trauma is needed to support its safety profile for clinical translation.

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.

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