Assessment of intracochlear trauma caused by the insertion of a new straight research array

Mukherjee, P; Uzun-Coruhlu, H; Wong, CC; Curthoys, IS; Jones, AS; Gibson, WPR

Assessment of intracochlear trauma caused by the insertion of a new straight research array

Mukherjee, P Uzun-Coruhlu, H Wong, CC Curthoys, IS Jones, AS

Gibson, WPR

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Publication Type:: Journal Article
Citation:: Cochlear Implants International, 2012, 13 (3), pp. 156 - 162
Issue Date:: 2012-08-01

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Field	Value	Language
dc.contributor.author	Mukherjee, P	en_US
dc.contributor.author	Uzun-Coruhlu, H	en_US
dc.contributor.author	Wong, CC	en_US
dc.contributor.author	Curthoys, IS	en_US
dc.contributor.author	Jones, AS https://orcid.org/0000-0002-3522-6371	en_US
dc.contributor.author	Gibson, WPR	en_US
dc.date.issued	2012-08-01	en_US
dc.identifier.citation	Cochlear Implants International, 2012, 13 (3), pp. 156 - 162	en_US
dc.identifier.issn	1467-0100	en_US
dc.identifier.uri	http://hdl.handle.net/10453/115481
dc.description.abstract	Objective: To assess the degree of intracochlear trauma using the Cochlear™ Straight Research Array (SRA). This electrode has recently been released by Cochlear™ on the CI422 implant. Background: Electroacoustic stimulation (EAS) enables recipients to benefit from cochlear implantation while retaining their natural low-frequency hearing. A disadvantage of short EAS electrodes is that short electrodes provide limited low-frequency stimulation. Thus, loss of the residual hearing may require reimplantation with a longer electrode. In order to overcome this problem, the slim diameter SRA with increased length (20-25 mm) has been designed to provide a deeper, yet non-traumatic insertion. Methods: Two insertion studies into temporal bones were undertaken. The first involved dissection of the cochlea to gain a view into the scala vestibuli and insertion of the SRA and control electrodes with a microactuator for a surgeon-independent yet controlled insertion. High-speed photography was used to record data. The second study involved a high-resolution X-ray microcomputed tomography (microCT) study to assess electrode placement and tissue preservation in surgeon-implanted bones. Results: The SRA had a smooth insertion trajectory. The average angular insertion depth was 383° when inserted until resistance was encountered, and 355° if inserted to a predetermined mark for EAS use. In addition, microCT data showed that this caused no significant trauma or distortion of the basilar membrane up to 20 mms depth. Conclusion: Temporal bone studies show that the SRA appears to cause no intracochlear trauma if used as an EAS electrode up to 20 mm depth of insertion. © W.S. Maney & Son Ltd 2012.	en_US
dc.relation.ispartof	Cochlear Implants International	en_US
dc.relation.isbasedon	10.1179/1754762811Y.0000000013	en_US
dc.subject.classification	Otorhinolaryngology	en_US
dc.subject.mesh	Temporal Bone	en_US
dc.subject.mesh	Cochlea	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Hearing Loss	en_US
dc.subject.mesh	Postoperative Complications	en_US
dc.subject.mesh	Image Interpretation, Computer-Assisted	en_US
dc.subject.mesh	Imaging, Three-Dimensional	en_US
dc.subject.mesh	Image Enhancement	en_US
dc.subject.mesh	Cochlear Implantation	en_US
dc.subject.mesh	Reoperation	en_US
dc.subject.mesh	Prosthesis Design	en_US
dc.subject.mesh	Prosthesis Fitting	en_US
dc.subject.mesh	Sound Spectrography	en_US
dc.subject.mesh	Electrodes, Implanted	en_US
dc.subject.mesh	Cochlear Implants	en_US
dc.subject.mesh	X-Ray Microtomography	en_US
dc.title	Assessment of intracochlear trauma caused by the insertion of a new straight research array	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	13	en_US
utslib.for	1103 Clinical Sciences	en_US
utslib.for	1303 Specialist Studies in Education	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	13	en_US

Abstract:

Objective: To assess the degree of intracochlear trauma using the Cochlear™ Straight Research Array (SRA). This electrode has recently been released by Cochlear™ on the CI422 implant. Background: Electroacoustic stimulation (EAS) enables recipients to benefit from cochlear implantation while retaining their natural low-frequency hearing. A disadvantage of short EAS electrodes is that short electrodes provide limited low-frequency stimulation. Thus, loss of the residual hearing may require reimplantation with a longer electrode. In order to overcome this problem, the slim diameter SRA with increased length (20-25 mm) has been designed to provide a deeper, yet non-traumatic insertion. Methods: Two insertion studies into temporal bones were undertaken. The first involved dissection of the cochlea to gain a view into the scala vestibuli and insertion of the SRA and control electrodes with a microactuator for a surgeon-independent yet controlled insertion. High-speed photography was used to record data. The second study involved a high-resolution X-ray microcomputed tomography (microCT) study to assess electrode placement and tissue preservation in surgeon-implanted bones. Results: The SRA had a smooth insertion trajectory. The average angular insertion depth was 383° when inserted until resistance was encountered, and 355° if inserted to a predetermined mark for EAS use. In addition, microCT data showed that this caused no significant trauma or distortion of the basilar membrane up to 20 mms depth. Conclusion: Temporal bone studies show that the SRA appears to cause no intracochlear trauma if used as an EAS electrode up to 20 mm depth of insertion. © W.S. Maney & Son Ltd 2012.

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http://hdl.handle.net/10453/115481