Electrical stimulation of the auditory nerve: comparison of half-band with full-band scala tympani bipolar electrodes
AuthorXu, Shi-Ang; McAnally, Ken I.; Xu, J.; Shepherd, R. K.; Clark, Graeme M.
Source TitleProceedings of the Australian Neuroscience Society
Document TypeConference Item
CitationsXu, S., McAnally, K. I., Xu, J., Shepherd, R. K., & Clark, G. M. (1993). Electrical stimulation of the auditory nerve: comparison of half-band with full-band scala tympani bipolar electrodes. In Proceedings of the Australian Neuroscience Society, Melbourne, Vic.
Access StatusOpen Access
This is an abstract of a paper from Proceedings of the Australian Neuroscience Society 1993 published by Australian Neuroscience Society. This version is reproduced with the permission of publisher.
The Melbourne/Cochlear auditory prosthesis uses an intracochlear electrode array containing 22 circumferential full-band electrodes mounted on a Silastic carrier. It could be hypothesized that half-band electrodes, oriented towards the modiolus, would produce lower stimulus thresholds than conventional full-band electrodes. This hypothesis is based on the assumption that, compared with full-band electrodes, half-band electrodes would produce an electrical field in which a greater proportion of the current would excite a defined group of neurons. In order to verify this hypothesis we recorded electrically evoked auditory brainstem responses (EABRs) for both full- and half-band electrodes inserted in the scala tympani of deafened cats. EABR thresholds for half-band electrodes oriented towards the modiolus were not significantly different from thresholds evoked using full-band electrodes (p>0.05, paired t-test), whereas thresholds evoked using half-band electrodes oriented towards the outer scala wall were significantly higher (p<0.01) than either the modiolar half-band or the full-band electrodes. These physiological results suggest that the electrical field generated within the auditory nerve by modiolar oriented half-band electrodes does not differ significantly from that produced by full-band electrodes. On the basis of these results, together with the fact that half-band electrodes would have higher current densities and electrode impedances, and would require careful orientation during implantation, we consider that there is no benefit in incorporating half-band electrodes in the design of scala tympani electrode arrays.
Keywordsotolaryngology; cochlear implants; electrical stimulation
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