title: Retinal neurostimulator for a multifocal vision prosthesis.
abstract: 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.
authors: Graduate School of Biomedical Engineering, University of New South Wales, Sydney NSW 2052, Australia.
authors: Yan T
authors: YT
authors: Wong
authors: Norbert
authors: N
authors: Dommel
authors: Philip
authors: P
authors: Preston
authors: Luke E
authors: LE
authors: Hallum
authors: Torsten
authors: T
authors: Lehmann
authors: Nigel H
authors: NH
authors: Lovell
authors: Gregg J
authors: GJ
authors: Suaning
mesh_terms: D004599:Electric Stimulation Therapy / Q000295:instrumentation* / Q000379:methods; D004567:Electrodes, Implanted; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D019736:Prostheses and Implants; D012164:Retinal Diseases / Q000534:rehabilitation*; D012682:Sensory Aids; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013813:Therapy, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D014786:Vision Disorders / Q000534:rehabilitation*