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Proceedings Paper

Flexible and extensible retinal prosthesis based on multi-chip architecture
Author(s): Akihiro Uehara; Yasuo Terasawa; Takashi Tokuda; Keiichiro Kagawa; Masahiro Nunoshita; Jun Ohta
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Paper Abstract

We present a multi-chip electric stimulator for a retinal prosthesis. The stimulator consists of small silicon devices (unit chips) molded in a thin film. It has an advantage over the conventional devices in physical flexibility and extendibility. The smart unit chip (600 μm square, in this work) is an integrated circuit (IC) that includes digital serial interface circuits, analog switch circuits and on-chip stimulus electrodes. In contrast to conventional stimulators, the present stimulator can be driven with only four wires. The multi-chip configuration enables to make the stimulator flexible and durable to bending stress. The device can be bended to place the stimulation electrodes in good contact with retinal tissue. In this paper, we present the design of the stimulator device with 0.35-μm complementary metal-oxide semiconductor (CMOS) technology. We also report a thin, flexible packaging technique for the stimulator and preliminary experimental results of a sputtered iridium oxide (IrOx) film that can be used for chronic stimulation.

Paper Details

Date Published: 7 March 2006
PDF: 8 pages
Proc. SPIE 6138, Ophthalmic Technologies XVI, 61380R (7 March 2006); doi: 10.1117/12.646202
Show Author Affiliations
Akihiro Uehara, NIDEK Co., Ltd. (Japan)
Yasuo Terasawa, NIDEK Co., Ltd. (Japan)
Takashi Tokuda, Nara Institute of Science and Technology (Japan)
Keiichiro Kagawa, Nara Institute of Science and Technology (Japan)
Masahiro Nunoshita, Nara Institute of Science and Technology (Japan)
Jun Ohta, Nara Institute of Science and Technology (Japan)

Published in SPIE Proceedings Vol. 6138:
Ophthalmic Technologies XVI
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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