An FPGA-based vision prosthesis prototype: Implementing an efficient multiplexing method for addressing electrodes

Y. T. Wong, G. J. Suaning, S. Dokos, P. J. Preston, N. Dommel, D. Grace, N. H. Lovell

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6 Citations (Scopus)


A prototype of an epi-retinal vision prosthesis based upon an efficient electrode addressing schema has been developed. This system has the ability to stimulate multiple electrode regions simultaneously, hence greatly improving the maximum rate of stimulation compared to many currently available neural stimulation devices based on serial stimulation protocols. To minimize the problem of cross talk between stimulating electrodes, a hexagon layout of electrodes was implemented. Basic tests were completed using a field programmable gate array logic system driving analogue circuitry to inject current into physiological saline via electrodes in hexagon arrangements and in a simple paired arrangement. The hexagon layout of electrodes was shown to clearly reduce the interaction between multiple current sources and hence cross talk.

Original languageEnglish
Title of host publicationProceedings of the 2005 27th Annual International Conference of the Engineering in Medicine and Biology Society, IEEE-EMBS 2005
Number of pages4
Volume7 VOLS
Publication statusPublished - 2005
Externally publishedYes
EventInternational Conference of the IEEE Engineering in Medicine and Biology Society 2005 - Shanghai, China
Duration: 1 Sept 20054 Sept 2005
Conference number: 27th (Proceedings)


ConferenceInternational Conference of the IEEE Engineering in Medicine and Biology Society 2005
Abbreviated titleEMBC 2005
Internet address


  • Electrodes
  • FPGA
  • Vision prosthesis

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