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Randles circuit model for characterizing a porous stimulating electrode of the retinal prosthesis
Author(s) -
Nomura Shuhei,
Tashiro Hiroyuki,
Terasawa Yasuo,
Nakano Yukari,
Haruta Makito,
Sasagawa Kiyotaka,
Takehara Hironari,
Ohta Jun
Publication year - 2021
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.12324
Subject(s) - electrode , electrical impedance , equivalent circuit , materials science , visual prosthesis , biomedical engineering , electrochemistry , retinal prosthesis , microelectrode , porosity , stimulation , retinal , optoelectronics , chemistry , composite material , electrical engineering , engineering , voltage , medicine , biochemistry
To develop a visual prosthesis, it is necessary to understand the changes in the electrochemical properties of stimulating electrodes implanted in the body. To evaluate these properties, we examined three types of equivalent circuit models that represented the electrode interface 23 weeks after the stimulation began. The results indicated that the Randles circuit model with Warburg impedance exhibited the difference in the electrochemical properties of the active and inactive electrodes, which might have been caused by the desorption of adsorbed protein from the electrode surface owing to the stimulation current. This model can be used to characterize the changes in the properties of porous stimulating electrodes.