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

Area of Science:

• Biomedical Engineering
• Neuroscience
• Materials Science

Background:

• Traditional neural stimulation systems face limitations in charge injection capacity and microelectrode safety.
• Activated iridium oxide (AIROF) microelectrodes offer potential for high-performance neural interfaces but require careful drive circuitry.
• Developing safe and efficient stimulation systems is crucial for advancing neural prosthetics.

Purpose of the Study:

• To design and test a 96-channel stimulation system for AIROF microelectrodes.
• To enhance charge-injection capacity while maintaining microelectrode safety.
• To provide a computer-controlled platform for intracortical neural stimulation.

Main Methods:

• Development of a 96-channel stimulation system using custom PCB boards, ASIC chips, and a motherboard.
• Implementation of a modified stimulation waveform to maximize charge injection.
• Integration with a PC interface including a DIO card and custom software.
• Testing of the system to ensure safe operation within charge-injection limits.

Main Results:

• Successful design and testing of a 96-channel stimulation system for AIROF microelectrodes.
• Demonstration of a system capable of delivering computer-controlled cathodic current pulses.
• Validation of the system's ability to positively bias microelectrodes during inter-pulse intervals.
• Confirmation that the system operates within safe charge-injection limits for AIROF microelectrodes.

Conclusions:

• The developed 96-channel stimulation system effectively drives AIROF microelectrodes safely and efficiently.
• This system represents an improvement over traditional methods, maximizing charge-injection capacity.
• The system is suitable for use in animal experiments for visual prosthesis research and intracortical neural stimulation.