Retinal prosthesis with separate electrode array and return electrodes

摘要

The artificial percept of light may be created by electrically stimulating the neurons of the retina. While a photolithographed array internal to the retina provides superior resolution, an array external to the retina provides easier implantation and improved manufacturability. Therefore it is advantageous to supply a high-resolution electrode array internal to the sclera, near the fovea and a lower-resolution electrode array external to the sclera near the periphery of the retina. It is advantageous to encourage current to flow through the retina by providing a physically separate and distinct electrode array and return electrode. The high-resolution electrode array and lower-resolution electrode array may be return electrodes for the other, or completely separate return electrodes may be provided.

主权项

1. A retinal prosthesis comprising:
a stimulating electrode array in a two dimensional arrangement suitable to be mounted within a sclera in close proximity to a retina; a return electrode array physically distinct and separate from said stimulating electrode array, the return electrode array having a lower resolution than the stimulating electrode array; an electronics package suitable to be mounted external to a sclera, the electronics package electrically coupled to the stimulating electrode array and the return electrode array.