Abstract
The Consortium for Retinal Prosthesis in Japan has developed a new method to stimulate the retina called suprachoroidal-transretinal stimulation (STS). The original plan for the STS retinal prosthesis was to insert the stimulating electrode array in the suprachoroidal space and the return electrode in the vitreous cavity. The transretinal currents would then stimulate the functioning retinal neurons. However, experiments showed that the stability of the electrode array was better when it was fixed inside a scleral pocket so currently we implant the electrode array in a scleral pocket which is adjacent to the suprachoroidal space. The semichronic clinical trial was done using the first generation STS system by nine active electrodes on two patients with advanced RP. The results showed that grasping an object task is possible by prosthetic vision using STS ststem. At present we are doing clinical trial using second generation STS system using 49 channel electrode on three patients with advanced RP. In future, we are planning to implant multiple electrode array using STS system to expand the visual field for walking.
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