Title :
A 96-channel neural stimulation system for driving AIROF microelectrodes
Author :
Hu, Z. ; Troyk, P.R. ; Cogan, S.F.
Author_Institution :
Illinois Inst. of Technol., Chicago, IL, USA
Abstract :
We present the design and testing of a 96-channel stimulation system to drive activated iridium oxide (AIROF) microelectrodes within safe charge-injection limits. Our system improves upon the traditional capacitively coupled, symmetric charge-balanced biphasic stimulation waveform so as to maximize charge-injection capacity without endangering the microelectrodes. It can deliver computer-controlled cathodic current pulse for to up to 96 AIROF microelectrodes and positively bias them during the inter-pulse interval. The stimulation system is comprised of (1) 12 custom-designed PCB boards each hosting an 8-channel ASIC chip, (2) a motherboard to communicate between these 12 boards and the PC, (3) the PC interface equipped with a DIO card and the corresponding software. We plan to use this system in animal experiments for intracortical neural stimulation of implanted electrodes within our visual prosthesis project.
Keywords :
eye; iridium compounds; microelectrodes; neurophysiology; prosthetics; 96-channel neural stimulation system; ASIC chip; DIO card; activated iridium oxide microelectrodes; computer-controlled cathodic current pulse; custom-designed PCB boards; implanted electrodes; inter-pulse interval; intracortical neural stimulation; motherboard; safe charge-injection limits; visual prosthesis; Application specific integrated circuits; Control systems; Driver circuits; Electrodes; Hardware; Microelectrodes; Mirrors; Resistors; Space vector pulse width modulation; Voltage; AIROF; Microelectrodes; anodic bias; multichannel; neural stimulation;
Conference_Titel :
Engineering in Medicine and Biology Society, 2004. IEMBS '04. 26th Annual International Conference of the IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-8439-3
DOI :
10.1109/IEMBS.2004.1404183
