Charge recovery during concurrent stimulation for a vision prosthesis

M. Mohd Addi, S. Dokos, P. J. Preston, N. Dommel, Y. T. Wong, N. H. Lovell

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

4 Citations (Scopus)

Abstract

Parallel or concurrent stimulation in an epiretinal neuroprosthesis is likely necessary in order to deliver sufficient phosphenes for effective vision. Important issues with concurrent stimulation are the effect of current distribution which introduces current leakage or 'cross talk' between adjacent electrodes and charge recovery which determines balanced charge being delivered/recovered at each electrode from the previous phase. In this paper, we present the effect of concurrent stimulation of two hexagonally arranged platinum electrode arrays on charge recovery. Balanced and imbalanced (unequal) currents were delivered to the hexagonal arrays when they were immersed in physiological saline. Both simulation and experimental results revealed that charge was not recovered at individual electrodes, particularly when imbalanced currents were delivered. However, total charge injected to both hexagonal arrays was recovered.

Original languageEnglish
Title of host publicationProceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08
PublisherIEEE, Institute of Electrical and Electronics Engineers
Pages1797-1800
Number of pages4
ISBN (Print)9781424418152
Publication statusPublished - 1 Dec 2008
Externally publishedYes
EventInternational Conference of the IEEE Engineering in Medicine and Biology Society 2008 - Vancouver Convention and Exhibition Centre, Vancouver, Canada
Duration: 20 Aug 200825 Aug 2008
Conference number: 30th

Publication series

NameProceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 - "Personalized Healthcare through Technology"

Conference

ConferenceInternational Conference of the IEEE Engineering in Medicine and Biology Society 2008
Abbreviated titleEMBS 2008
CountryCanada
CityVancouver
Period20/08/0825/08/08

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