Research On Artificial Retinal System Based On MEMS Technology

Bio-MEMS is a new subject researching on the microsystem in biomedicine with MEMS technology. The artificial retina is a typical application in bio-MEMS. Despite enormous efforts and advances in the mechanism of retinal diseases there is no established method to cure degenerative processes in eyes. Using artificial retina, Electrical stimulation of the remaining retinal neurons to restore useful vision has became feasible. It makes use of a thin chip to instead of the broken retinal tissue with vision optics, ocular nerve surgery, new materials and micro-machining technology. And the chip can be fabricated through IC processes with low cost and high yield. The main research contents in this paper are as follows:First, the fundamental principles of photoelectricity conversion structure is studied which is the most significant part of retinal chip and the model of the structure is founded; the photoelectricity conversion is discussed by simulation.Second, on designing of artificial retinal chip, the fundamental working principles of two representative artificial retinal system are thoroughly investigated and the system configuration is worked out; the structure of retinal chip are optimized through finite element analysis; the appropriate materials are chosen by means of biomedical testing; the fabrication processes are discussed with key process experiments.Finally, the retinal imaging technology is analyzed. The control circuit model and arithmetic are proposed based on the research of mechanism of image processing.The paper aims at providing an artificial retinal system which based on MEMS technology, and pushing the research and commercialization of Bio-MEMS devices.