Micromachined electrodes for retinal prostheses

Author

Hung, Andy ; Zhou, David ; Greenberg, Robert ; Judy, Jack W.

Author_Institution

Biomed. Eng. IDP, California Univ., Los Angeles, CA, USA

fYear

2002

fDate

6/24/1905 12:00:00 AM

Firstpage

76

Lastpage

79

Abstract

High-resolution retinal prosthetic systems need high-density stimulation electrodes to restore the vision of blind patients suffering from retinitis pigmentosa or macular degeneration. Micromachining electrodes to obtain high-aspect-ratio features can increase the area of the electrodes. A process has been developed to obtain high-aspect-ratio microstructures by plating on the sidewall of recently developed photoresist. A quadrupling of the effective area of the electrode surface has been achieved with modest micromachining and could translate into an improvement in visual resolution. A remaining issue is reducing irreversible electrochemical reactions at the electrode

Keywords

biomedical electrodes; electroplating; eye; microelectrodes; micromachining; prosthetics; sensory aids; effective electrode surface area; electrode charge injection limit; electrode-electrolyte interface; electroplating; high-aspect-ratio microstructures; high-density stimulation electrodes; high-resolution prosthetic systems; irreversible electrochemical reactions; macular degeneration; microelectrode arrays; micromachined electrodes; photoresist; retinal prostheses; retinitis pigmentosa; sidewall plating; visual resolution; Electrodes; Micromachining; Microstructure; Photoreceptors; Pigmentation; Platinum; Prosthetics; Radio frequency; Retina; Visual perception;

fLanguage

English

Publisher

ieee

Conference_Titel

Microtechnologies in Medicine & Biology 2nd Annual International IEEE-EMB Special Topic Conference on

Conference_Location

Madison, WI

Print_ISBN

0-7803-7480-0

Type

conf

DOI

10.1109/MMB.2002.1002268

Filename

1002268