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Creation of an incus recess for a middle-ear microphone using a drill or laser ablation : a comparison of equivalent noise level and middle ear transfer function

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Morse, Robert P., Mitchell-Innes, Alistair, Prokopiou, Andreas N., Irving, Richard M. and Begg, Philip A. (2023) Creation of an incus recess for a middle-ear microphone using a drill or laser ablation : a comparison of equivalent noise level and middle ear transfer function. European Archives of Oto-Rhino-Laryngology, 280 . pp. 661-669. doi:10.1007/s00405-022-07532-2 ISSN 1434-4726.

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Official URL: https://doi.org/10.1007/s00405-022-07532-2

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Abstract

Purpose: Studies have assessed the trauma and change in hearing function from the use of otological drills on the ossicular chain, but not the effects of partial laser ablation of the incus. A study of the effectiveness of a novel middle-ear microphone for a cochlear implant, which required an incus recess for the microphone balltip, provided an opportunity to compare methods and inform a feasibility study of the microphone with patients.
Methods: We used laser Doppler vibrometry with an insert earphone and probe microphone in 23 ears from 14 fresh-frozen cadavers to measure the equivalent noise level at the tympanic membrane that would have led to the same stapes velocity as the creation of the incus recess.
Results: Drilling on the incus with a diamond burr created peak noise levels equivalent to 125.1–155.0 dB SPL at the tympanic membrane, whilst using the laser generated equivalent noise levels barely above the baseline level. The change in middle ear transfer function following drilling showed greater variability at high frequencies, but the change was not statistically significant in the three frequency bands tested. Conclusions: Whilst drilling resulted in substantially higher equivalent noise, we considered that the recess created by laser ablation was more likely to lead to movement of the microphone balltip, and therefore decrease performance or result in malfunction over time. For patients with greatly reduced residual hearing, the greater consistency from drilling the incus recess may outweigh the potential benefits of hearing preservation with laser ablation.

Item Type: Journal Article
Subjects: Q Science > QM Human anatomy
Q Science > QP Physiology
R Medicine > RF Otorhinolaryngology
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Vibration -- Measurement, Otolaryngology, Middle ear -- Diseases, Ear -- Diseases, Middle ear, Laser ablation
Journal or Publication Title: European Archives of Oto-Rhino-Laryngology
Publisher: Springer
ISSN: 1434-4726
Official Date: February 2023
Dates:
DateEvent
February 2023Published
14 July 2022Available
27 June 2022Accepted
Volume: 280
Page Range: pp. 661-669
DOI: 10.1007/s00405-022-07532-2
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 13 September 2022
Date of first compliant Open Access: 13 September 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
II-C2-0713–20003National Institute for Health Researchhttp://dx.doi.org/10.13039/501100000272

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