Sensorial prostheses

Liu, Wentai; McGucken, E.; Cavin, Ralph K.; Clements, Mark A.; Vichienchom, Kasin; emarco, Chris; Humayun, Mark S.; Juan, Eugene de; Weiland, James D.; Greenberg, Robert J.

doi:10.1201/9781420042122.ch2

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“…The possibilities of artificial vision by electrical stimulation are being investigated by many groups (1–5). While many approaches have been adopted, our group has focused on a epiretinal approach.…”

Section: Introductionmentioning

confidence: 99%

Electronic Visual Prosthesis

et al. 2003

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Retinitis pigmentosa (RP) and age-related macular degeneration (AMD) are incurable diseases that result in profound vision loss due to degeneration of the light sensing photoreceptors. However, the discovery that direct electrical stimulation of the retinal neurons creates visual sensation has inspired prosthetic devices aimed to restore useful vision in RP/AMD patients. The approach to one such electronic visual prosthesis is described in this article. The prosthesis consists of an external unit and an internal unit. The communication link has three components--power and data transfer from the external to the internal unit, and data transfer from the internal to the external unit. A novel method of integrating power transfer and back telemetry is described here. The goal is to design a stimulator chip with a small area with low power consumption. This chip, capable of stimulating 60 dedicated electrodes, is fabricated using AMI 1.2 microm process technology and the results are presented. Improvements in the design to increase the number of outputs to 1,000 have been discussed. The new circuit is aimed at increasing the circuit density, reducing power per stimulus, and meeting the requirements more closely than the previous designs. The results of the designed chip are presented.

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Section: Introductionmentioning

confidence: 99%