Sensors and Materials
ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Sensors and Materials,
Volume 30, Number 2 (2018)

Copyright(C) MYU K.K. All Rights Reserved.
pp. 315-326
S&M1493
https://doi.org/10.18494/SAM.2018.1701
Published: January 26, 2018

Effects of an Asymmetric Electrical Pulse on Retinal Excitement for Retinal Prostheses [PDF]

Yukari Nakano, Yasuo Terasawa, Hiroyuki Kanda, Jun Ohta, Hajime Sawai, and Takashi Fujikado

(Received July 21, 2017; Accepted December 8, 2017)

Keywords: retinal prosthesis, asymmetric pulse, electrical stimulation parameter, retinitis pigmentosa

Retinal prostheses for blindness electrically stimulate retinas with photoreceptor cell degeneration to evoke a pseudolight sensation (phosphenes). Biphasic symmetric pulses with charge balancing are commonly used for electrical stimulation in retinal prostheses. It has been reported that a charge-balanced biphasic asymmetric pulse can reduce the threshold for electrical evoked responses in cochlear implants. In this study, in order to determine the effectiveness of an asymmetric pulse, we applied single biphasic symmetric and asymmetric pulses transretinally to the eyeball of anesthetized rats. We found that the application of an anodal pulse with a shorter duration and a higher current amplitude evoked a large field response in the superior colliculus in comparison with a symmetric pulse with the same electrical charge. This result suggests that an asymmetric pulse with a short pulse duration and high current amplitude in the anodal phase is more effective for retinal prostheses prostheses than a symmetrical pulse with the same electrical charge.

Corresponding author: Yukari Nakano


Cite this article
Yukari Nakano, Yasuo Terasawa, Hiroyuki Kanda, Jun Ohta, Hajime Sawai, and Takashi Fujikado, Effects of an Asymmetric Electrical Pulse on Retinal Excitement for Retinal Prostheses, Sens. Mater., Vol. 30, No. 2, 2018, p. 315-326.


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