March 2012
Volume 53, Issue 14
ARVO Annual Meeting Abstract  |   March 2012
Porous Platinum Electrodes for Retinal Prostheses
Author Affiliations & Notes
  • Yasuo Terasawa
    Vision Institute,
    NIDEK Co Ltd, Gamagori, Japan
    Grad Sch of Materials Science, Nara Inst Science and Techn, Ikoma, Japan
  • Hiroyuki Tashiro
    Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
  • Kouji Osawa
    Vision Institute,
    NIDEK Co Ltd, Gamagori, Japan
  • Motoki Ozawa
    NIDEK Co Ltd, Gamagori, Japan
  • Toshihiko Noda
    Grad Sch of Materials Science, Nara Inst Science and Techn, Ikoma, Japan
  • Jun Ohta
    Grad Sch of Materials Science, Nara Inst Science and Techn, Ikoma, Japan
  • Takashi Fujikado
    Dept of Applied Vis Science, Osaka Univ Medical School, Suita, Japan
  • Footnotes
    Commercial Relationships  Yasuo Terasawa, Nidek Co.,ltd. (E); Hiroyuki Tashiro, None; Kouji Osawa, Nidek Co.,ltd. (E); Motoki Ozawa, Nidek Co.,Ltd. (E); Toshihiko Noda, None; Jun Ohta, None; Takashi Fujikado, None
  • Footnotes
    Support  Nidek Co.,Ltd.
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 5538. doi:
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    • Get Citation

      Yasuo Terasawa, Hiroyuki Tashiro, Kouji Osawa, Motoki Ozawa, Toshihiko Noda, Jun Ohta, Takashi Fujikado; Porous Platinum Electrodes for Retinal Prostheses. Invest. Ophthalmol. Vis. Sci. 2012;53(14):5538.

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      © ARVO (1962-2015); The Authors (2016-present)

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We have proposed a bullet-shaped electrode formed by mechanical machining for retinal prostheses (Terasawa et. al., ARVO 2008). The purpose of this study is to enhance the surface area of the electrode by forming a large number of holes onto its surface.


Femtosecond laser pulses were applied onto the surface of a bullet-shaped electrode to make holes. A porous surface was obtained by repeating laser irradiation all over the upper hemisphere of the electrode. Scanning electron microscopy, cyclic voltammetry and impedance spectroscopy was performed to confirm the effect of laser irradiation. We also analyzed the cross section of holes to examine their shape and depth.


The impedance of the electrode, measured by applying 1kHz sine wave, decreased from 1264 Ohm by 443 Ohm by laser irradiation. The electrode could inject 1.65 uC/phase current pulses without exceeding the water window in phosphate buffered saline. We succeeded in controlling the depth of holes over the range from 12um to 117 um by adjusting the strength of laser irradiation.


We succeeded in enhancing the surface area of bullet-shaped electrodes with femtosecond laser irradiation. We will confirm the reliability of this electrode by long term pulsing in vitro and in vivo in the next step.  


Keywords: retina 

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