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An FPGA-Based Vision Prosthesis Prototype: Implementing an Efficient Multiplexing Method for Addressing Electrodes.

Y Wong1, G Suaning, S Dokos

  • 1Graduate School of Biomedical Engineering, University of New South Wales, Sydney Australia.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 7, 2007
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A new epi-retinal vision prosthesis prototype uses an efficient electrode design to simultaneously stimulate multiple regions. This approach significantly enhances stimulation rates and reduces signal interference, improving neural stimulation device performance.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology

Background:

  • Current neural stimulation devices often rely on serial protocols, limiting stimulation rates.
  • Cross-talk between stimulating electrodes is a significant challenge in developing effective neural prostheses.
  • Epi-retinal vision prostheses aim to restore vision by stimulating the retina.

Purpose of the Study:

  • To develop and test a prototype epi-retinal vision prosthesis with an efficient electrode addressing schema.
  • To investigate a novel hexagon electrode layout for minimizing cross-talk.
  • To improve the maximum rate of stimulation for neural prostheses.

Main Methods:

  • Developed a prototype epi-retinal vision prosthesis system.
  • Implemented a hexagon electrode layout to reduce cross-talk.

Related Experiment Videos

  • Utilized a field-programmable gate array (FPGA) logic system and analog circuitry for current injection into physiological saline.

    • Main Results:

    • The developed system enables simultaneous stimulation of multiple electrode regions.
    • The hexagon electrode arrangement demonstrated a clear reduction in interaction between current sources.
    • Cross-talk was significantly minimized compared to a simple paired electrode arrangement.

    Conclusions:

    • The prototype demonstrates a viable and efficient electrode addressing schema for vision prostheses.
    • The hexagon electrode layout effectively mitigates cross-talk, enhancing signal fidelity.
    • This advancement holds promise for improving the performance of neural stimulation devices for vision restoration.