The development of a multichannel electrode array for retinal prostheses

Yasuo Terasawa, Hiroyuki Tashiro, Akihiro Uehara, Tohru Saitoh, Motoki Ozawa, Takashi Tokuda, Jun Ohta

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)263-266
Number of pages4
JournalJournal of Artificial Organs
Issue number4
Publication statusPublished - Dec 2006

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Biomaterials
  • Biomedical Engineering
  • Cardiology and Cardiovascular Medicine


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