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A neuro-stimulus chip with telemetry unit for retinal prosthetic device

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10 Author(s)
Wentai Liu ; Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA ; Vichienchom, K. ; Clements, M. ; DeMarco, S.C.
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In this retinal prosthesis project, a rehabilitative device is designed to replace the functionality of defective photoreceptors in patients suffering from retinitis pigmentosa (RP) and age-related macular degeneration (AMD). The device consists of an extraocular and an intraocular unit. The implantable component receives power and a data signal via a telemetric inductive link between the two units. The extraocular unit includes a video camera and video processing board, a telemetry protocol encoder chip, and an RF amplifier and primary coil. The intraocular unit consists of a secondary coil, a rectifier and regulator, a retinal chip with a telemetry protocol decoder, a stimulus signal generator, and an electrode array. This paper focuses on the design, fabrication, and testing of a microchip which serves as the telemetry protocol decoder and stimulus signal generator. It is fabricated by MOSIS with 1.2-mm CMOS technology and was demonstrated to provide the desired biphasic current stimulus pulses for an array of 100 retinal electrodes at video frame rates.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:35 ,  Issue: 10 )