Impedance changes in chronically implanted and stimulated cochlear implant electrodes.

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dc.contributor.authorNewbold, Carrie
dc.contributor.authorMergen, Silvana
dc.contributor.authorRichardson, Rachael
dc.contributor.authorSeligman, Peter
dc.contributor.authorMillard, Rodney
dc.contributor.authorCowan, Robert
dc.contributor.authorShepherd, Robert
dc.date.accessioned2018-01-17T05:32:32Z
dc.date.available2018-01-17T05:32:32Z
dc.date.issued2014
dc.description.abstractOBJECTIVES: Electrode impedance increases following implantation and undergoes transitory reduction with onset of electrical stimulation. The studies in this paper measured the changes in access resistance and polarization impedance in vivo before and following electrical stimulation, and recorded the time course of these changes. DESIGN: Impedance measures recorded in (a) four cats following 6 months of cochlear implant use, and (b) three cochlear implant recipients with 1.5-5 years cochlear implant experience. RESULTS: Both the experimental and clinical data exhibited a reduction in electrode impedance, 20 and 5% respectively, within 15-30 minutes of stimulation onset. The majority of these changes occurred through reduction in polarization impedance. Cessation of stimulation was followed by an equivalent rise in impedance measures within 6-12 hours. CONCLUSIONS: Stimulus-induced reductions in impedance exhibit a rapid onset and are evident in both chronic in vivo models tested, even several years after implantation. Given the impedance changes were dominated by the polarization component, these findings suggest that the electrical stimulation altered the electrode surface rather than the bulk tissue and fluid in the cochlea.en_US
dc.description.sponsorshipThis work was funded by the Cooperative Research Centre (CRC) for Cochlear Implant and Hearing Aid Innovation and the HEARing CRC, established and supported under the Australian Government’s Cooperative Research Centres Program. The electrodes were made in-house by Ms Helen Feng. The data for the cat study were collected in conjunction with the Bionics Institute’s study, supported by the National Institute of Health (NIDCD contract number NIH-N01-DC-3-1005). We gratefully acknowledge the time and effort taken by our three cochlear implant recipients. The Bionics Institute acknowledges funding from the Victorian State Government’s infrastructure grant scheme.en_US
dc.identifier.citationNewbold, C., S. Mergen, R. Richardson, P. Seligman, R. Millard, R. Cowan, and R. Shepherd. 2014. Impedance changes in chronically implanted and stimulated cochlear implant electrodes. Cochlear Implants International. 15(4): 191-9.en_US
dc.identifier.issn1467-0100
dc.identifier.urihttp://repository.bionicsinstitute.org:8080/handle/123456789/279
dc.language.isoenen_US
dc.publisherWS Maney & Sonen_US
dc.subjectElectrode impedanceen_US
dc.subjectAccess resistanceen_US
dc.subjectPolarization impedanceen_US
dc.subjectCochlear implanten_US
dc.subjectElectrical stimulationen_US
dc.titleImpedance changes in chronically implanted and stimulated cochlear implant electrodes.en_US
dc.typeArticleen_US
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