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Improving the sensitivity of cochlear implant integrity testing by recording electrode voltages with surface electrodes

Improving the sensitivity of cochlear implant integrity testing by recording electrode voltages with surface electrodes
Improving the sensitivity of cochlear implant integrity testing by recording electrode voltages with surface electrodes
Identification of faults with the internal, implanted, part of a cochlear implant presents a challenge for the cochlear implant community. Advanced Bionics Ultra V1 devices are vulnerable to moisture ingress, a hard failure, resulting in reduced volume and clarity for the recipient. The manufacturer uses a trans-impedance test “Electrical Field Imaging” to identify faulty Ultra V1 devices but reports the sensitivity of the test to be only 70-90%. In our clinic we performed Electrode Voltage measurements with surface electrodes and have compared the two tests. Electrical Field imaging and Electrode Voltage measurements were available for 65 devices. Surface electrodes were attached to the earlobes and forehead and potentials measured in three montages ipsilateral earlobe and forehead, contralateral earlobe and forehead, and both earlobes; voltages were extracted and relative voltages across the array were compared for the two earlobes montage. These were fitted to a third order polynomial function. A new criterion for identifying faulty devices was derived, with a deviation of
cochlear implant, electrode voltage, integrity test, surface potential, Ultra V1, electric field imaging
2813-6055
Grasmeder, Mary
206e6b44-d1cd-43f5-99ac-588ab02d44ef
Rogers, Katrine
54594b3d-b7b5-4f70-9269-853215db82eb
Aydin, Ziya
a59046ba-fde4-495b-ac92-a46a5391db6c
Hough, Kate
81d8630c-6e02-4bea-858a-377717476f6e
Verschuur, Carl
5e15ee1c-3a44-4dbe-ad43-ec3b50111e41
Newman, Tracey
322290cb-2e9c-445d-a047-00b1bea39a25
Grasmeder, Mary
206e6b44-d1cd-43f5-99ac-588ab02d44ef
Rogers, Katrine
54594b3d-b7b5-4f70-9269-853215db82eb
Aydin, Ziya
a59046ba-fde4-495b-ac92-a46a5391db6c
Hough, Kate
81d8630c-6e02-4bea-858a-377717476f6e
Verschuur, Carl
5e15ee1c-3a44-4dbe-ad43-ec3b50111e41
Newman, Tracey
322290cb-2e9c-445d-a047-00b1bea39a25

Grasmeder, Mary, Rogers, Katrine, Aydin, Ziya, Hough, Kate, Verschuur, Carl and Newman, Tracey (2024) Improving the sensitivity of cochlear implant integrity testing by recording electrode voltages with surface electrodes. Frontiers in Audiology and Otology. (doi:10.3389/fauot.2024.1342263).

Record type: Article

Abstract

Identification of faults with the internal, implanted, part of a cochlear implant presents a challenge for the cochlear implant community. Advanced Bionics Ultra V1 devices are vulnerable to moisture ingress, a hard failure, resulting in reduced volume and clarity for the recipient. The manufacturer uses a trans-impedance test “Electrical Field Imaging” to identify faulty Ultra V1 devices but reports the sensitivity of the test to be only 70-90%. In our clinic we performed Electrode Voltage measurements with surface electrodes and have compared the two tests. Electrical Field imaging and Electrode Voltage measurements were available for 65 devices. Surface electrodes were attached to the earlobes and forehead and potentials measured in three montages ipsilateral earlobe and forehead, contralateral earlobe and forehead, and both earlobes; voltages were extracted and relative voltages across the array were compared for the two earlobes montage. These were fitted to a third order polynomial function. A new criterion for identifying faulty devices was derived, with a deviation of

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More information

e-pub ahead of print date: 29 January 2024
Published date: 29 January 2024
Additional Information: This work was supported by the Engineering and Physical Sciences Research Council, grant numbers EP/W018764/1, EP/W018918/1
Keywords: cochlear implant, electrode voltage, integrity test, surface potential, Ultra V1, electric field imaging

Identifiers

Local EPrints ID: 487216
URI: http://eprints.soton.ac.uk/id/eprint/487216
ISSN: 2813-6055
PURE UUID: 703f6c68-6764-4d4d-bd2c-1ec524875a2f
ORCID for Kate Hough: ORCID iD orcid.org/0000-0002-5160-2517
ORCID for Tracey Newman: ORCID iD orcid.org/0000-0002-3727-9258

Catalogue record

Date deposited: 16 Feb 2024 11:05
Last modified: 01 Oct 2024 02:06

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Contributors

Author: Mary Grasmeder
Author: Katrine Rogers
Author: Ziya Aydin
Author: Kate Hough ORCID iD
Author: Carl Verschuur
Author: Tracey Newman ORCID iD

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