Research Of The Wireless Power And Data Talemetry System For Visual Prostheses

The ultimate goal of artificial vision systems is to produce a visual perception by artificial ways in individuals with profound loss of vision due to disease or injury. This system can be used to perform activities for which current assistive technologies have sever limitations, such as reading text, recognizing face and negotiating unfamiliar spaces. The ability to perform these tasks in an intact visual system arises from a neural network which has multiple structures to process information in parallel with feedback. If the system is damaged by trauma or disease, blindness will be the result. It will bring the inability of the neural elements of the visual system which can not repair or regenerate any more. The ultimate goal of vision prostheses is to bypass the damaged elements of the visual pathway, interface to the remaining structures of the visual pathway, and artificially generate visual perception for the individuals, who lost vision due to disease or injury.Despite the difference in the approaches, all vision prostheses share a common set of component, the most significant differences are in the interface to the nervous system. The components are: a camera to convert light into electrical signals, a signal processing system to decode the information according to physiological parameters, a way to transmit power and control signals to implanted electronics, a way to stimulate multiple electrodes to generate the phosphenes, and the electrode arrays.This paper presents a wireless power and data telemetry system suitable for visual prosthes.Main contents of this paper conclude: firstly, the design of wireless power telemetry system for visual prostheses. The main goal of this part is to provide energy to the implanted micro-electronic system and ensure it can work stablely under some specific requirements; Secondly, the design of wireless data telemetry system for visual prostheses. The main goal of this part is to transfer the processed data signal from the external part to the internal neural stimulator system.The novelties of this research are: firstly, we introduce a new wireless power telemetry method which can adjust the energy supply to the internal micro-electronic system Real-timely. The advantage of this method can improve the power transmission efficiency obviously, reduce energy consumption, extend the life of the external electrical source and become convinent for patients'use. Secondly, we adopt Microchip PIC16F690 and TI Chipcon RF transceiver chip CC1100 to realize wireless data transmission. The controller PIC16F690 and the RF chip CC1100 possess the advantages of high-integration, small size and low power consumption, which are suitable and important for implanted bio-medical device.