April 2011
Volume 52, Issue 14
Free
ARVO Annual Meeting Abstract  |   April 2011
Surgical Approach for Semi-chronic Implantation of Retinal Prosthesis by Suprachoroidal-Transretinal Stimulation (STS) in Patients with Retinitis Pigmentosa
Hirokazu Sakaguchi; Motohiro Kamei; Kentaro Nishida; Yasushi Ikuno; Takeshi Morimoto; Haruhiko Kishima; Tomoyuki Maruo; Motoki Ozawa; Takashi Fujikado; Kohji Nishida
Author Affiliations & Notes
  • Hirokazu Sakaguchi
    Department of Ophthalmology,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Motohiro Kamei
    Department of Ophthalmology,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Kentaro Nishida
    Department of Ophthalmology,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Yasushi Ikuno
    Department of Ophthalmology,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Takeshi Morimoto
    Department of Applied Visual Science,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Haruhiko Kishima
    Department of Neurosurgery,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Tomoyuki Maruo
    Department of Neurosurgery,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Motoki Ozawa
    Nidek Co., Gamagori, Japan
  • Takashi Fujikado
    Department of Applied Visual Science,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Kohji Nishida
    Department of Ophthalmology,
    Osaka University Graduate School of Medicine, Suita, Japan
  • Footnotes
    Commercial Relationships  Hirokazu Sakaguchi, None; Motohiro Kamei, None; Kentaro Nishida, None; Yasushi Ikuno, None; Takeshi Morimoto, None; Haruhiko Kishima, None; Tomoyuki Maruo, None; Motoki Ozawa, Nidek Co. (E); Takashi Fujikado, None; Kohji Nishida, None
  • Footnotes
    Support  Health Sciences Research Grants from the Ministry of Health, Labor and Welfare and Strategic Research Program for Brain Sciences from the Ministry of Education, Culture, Sports, Science and Technology
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 4963. doi:
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      Hirokazu Sakaguchi, Motohiro Kamei, Kentaro Nishida, Yasushi Ikuno, Takeshi Morimoto, Haruhiko Kishima, Tomoyuki Maruo, Motoki Ozawa, Takashi Fujikado, Kohji Nishida; Surgical Approach for Semi-chronic Implantation of Retinal Prosthesis by Suprachoroidal-Transretinal Stimulation (STS) in Patients with Retinitis Pigmentosa. Invest. Ophthalmol. Vis. Sci. 2011;52(14):4963.

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Abstract

Purpose: : We have developed a retinal prosthesis by suprachoroidal-transretinal stimulation (STS) and reported the safety and effectiveness of this approach on acute clinical trials. Now we have developed a wireless device for a semi-chronic trial. In this study we implanted the device in two patients with advanced retinitis pigmentosa (RP) and examined the safety of the surgical procedure.

Methods: : The visual acuity was bare light perception in the left eyes of the patients with RP. The wireless STS device was subcutaneously implanted on the left occipital bone. A scleral pocket of 7x7 mm was created at the lower-temporal to the posterior of the globe and a 49-channel-electrode array (5.7 × 4.6 mm, with each platinum electrode having a diameter of 0.5 mm) was inserted into the pocket. The cables were then secured with sutures on sclera around the eye. A platinum return electrode was inserted into the vitreous cavity through the pars plana at the upper-nasal area. Five and seven weeks after implantation, the devise, wire and electrodes array were removed. Approval from the Institutional Review Board Committee and informed consent were obtained for these cases.

Results: : The surgery was performed without serious complications such as infection, epilepsy, endophthalmitis, retinal detachment or retinal and choroidal bleeding. The surgical time was approximately 6 hours. Eye movement was slightly restricted in several directions during implantation for the first case. Conjunctival suture was performed at a more posterior position than usual for the second case and eye movement was then normal during implantation. After the removal of the system, the eye movements of both cases were normal. Visual acuity was light perception after the removal of the device.

Conclusions: : The wireless device was developed for a semi-chronic implantation of the retinal prosthesis by STS. No serious complications occurred during and after the surgery, suggesting that this procedure is safe enough to perform a chronic trial.

Clinical Trial: : UMIN, UMIN000002208

Keywords: retina • clinical (human) or epidemiologic studies: systems/equipment/techniques 
© 2011, The Association for Research in Vision and Ophthalmology, Inc., all rights reserved. Permission to republish any abstract or part of an abstract in any form must be obtained in writing from the ARVO Office prior to publication.
Copyright © 2025 Association for Research in Vision and Ophthalmology.
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