Retinal Neurostimulator for a Multifocal Vision Prosthesis

A neurostimulator application-specific integrated circuit (ASIC) with scalable circuitry that can stimulate 14 channels, has been developed for an epi-retinal vision prosthesis. This ASIC was designed to allow seven identical units to be connected to control up to 98 channels, with the ability to st...

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Bibliographic Details
Published in:IEEE transactions on neural systems and rehabilitation engineering 2007-09, Vol.15 (3), p.425-434
Main Authors: Wong, Yan T., Dommel, Norbert, Preston, Philip, Hallum, Luke E., Lehmann, Torsten, Lovell, Nigel H., Suaning, Gregg J.
Format: Article
Language:English
Subjects:
Application specific integrated circuits
Australia
Biomedical engineering
Channels
Charge
Charge (electric)
Diseases
Electric charge
Electric Stimulation Therapy - instrumentation
Electric Stimulation Therapy - methods
Electrical stimulation
Electrodes
Electrodes, Implanted
Equipment Design
Equipment Failure Analysis
Eyes & eyesight
Frequency
Humans
Integrated circuit
Macular degeneration
neurostimulator
Pigmentation
Prostheses
Prostheses and Implants
Prosthetics
Retina
Retinal Diseases - rehabilitation
Sensory Aids
Signal Processing, Computer-Assisted - instrumentation
simultaneous stimulation
Stimulation
Surgical implants
Therapy, Computer-Assisted - instrumentation
Therapy, Computer-Assisted - methods
Vision
Vision Disorders - rehabilitation
vision prosthesis
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Description
Summary:A neurostimulator application-specific integrated circuit (ASIC) with scalable circuitry that can stimulate 14 channels, has been developed for an epi-retinal vision prosthesis. This ASIC was designed to allow seven identical units to be connected to control up to 98 channels, with the ability to stimulate 14 electrodes simultaneously. The neurostimulator forms part of a vision prosthesis, designed to restore vision to patients who have lost their sight due to retinal diseases such as retinitis pigmentosa and macular degeneration. For charge balance, the neurostimulator was designed to stimulate with current sources and sinks operating together, and with the ability to drive a hexagonal mosaic of electrodes to reduce the electrical crosstalk that occurs when multiple bipolar stimulation sites are active simultaneously. A hexagonal mosaic of electrodes surrounds each stimulation site and has been shown to effectively isolate each site, increasing the ability to inject localized independent charge into multiple regions simultaneously.
ISSN:1534-4320
1558-0210
DOI:10.1109/TNSRE.2007.903958