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The development of a multichannel electrode array for retinal prostheses

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Abstract

The development of a multielectrode array is the key issue for retinal prostheses. We developed a 10 × 10 platinum electrode array that consists of an 8-µm polyimide layer sandwiched between 5-µm polymonochloro-para-xylylene (parylene-C) layers. Each electrode was formed as a 30-µm-high bump by Pt/Au double-layer electroplating. We estimated the charge delivery capability (CDC) of the electrode by measuring the CDCs of two-channel electrode arrays. The dimensions of each electrode of the two-channel array were the same as those of each electrode formed on the 10 × 10 array. The results suggest that for cathodic-first (CF) pulses, 80% of electrodes surpassed our development target of 318 µC/cm2, which corresponds to the charge density of pulses of 500 µs duration and 200 µA amplitude for a 200-µm-diameter planar electrode.

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Authors and Affiliations

  1. Vision Institute, Nidek Co, Ltd, 73-1 Hama-cho, Gamagori, 443-0036, Japan

    Yasuo Terasawa MS, Akihiro Uehara PhD, Tohru Saitoh BS & Motoki Ozawa MS

  2. Department of Medicine, Kyushu University, Fukuoka, Japan

    Hiroyuki Tashiro MS

  3. Graduate School of Materials Science, Nara Institute of Science and Technology, Nara, Japan

    Takashi Tokuda PhD & Jun Ohta PhD

Authors
  1. Yasuo Terasawa MS
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  2. Hiroyuki Tashiro MS
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  3. Akihiro Uehara PhD
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  4. Tohru Saitoh BS
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  5. Motoki Ozawa MS
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  6. Takashi Tokuda PhD
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  7. Jun Ohta PhD
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Correspondence to Yasuo Terasawa MS.

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Terasawa, Y., Tashiro, H., Uehara, A. et al. The development of a multichannel electrode array for retinal prostheses. J Artif Organs 9, 263–266 (2006). https://doi.org/10.1007/s10047-006-0352-1

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  • DOI: https://doi.org/10.1007/s10047-006-0352-1

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