Article

A 96-channel neural stimulation system for driving AIROF microelectrodes.

Illinois Institute of Technology, Chicago, IL, USA.
Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 02/2004; 6:4244-7. DOI:10.1109/IEMBS.2004.1404183 pp.4244-7
Source: PubMed

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.

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Keywords

12 boards
 
8-channel ASIC chip
 
96-channel stimulation system
 
animal experiments
 
charge-injection capacity
 
computer-controlled cathodic current pulse
 
corresponding software
 
DIO card
 
drive activated iridium oxide
 
implanted electrodes
 
inter-pulse interval
 
intracortical neural stimulation
 
motherboard
 
PC interface
 
stimulation system
 
symmetric charge-balanced biphasic stimulation waveform
 
traditional capacitively