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A laboratory testing and driving system for AIROF microelectrodes.

N R Srivastava1, P R Troyk, S F Cogan

  • 1Illinois 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. Annual Conference
|February 3, 2007
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To ensure safe operation, charge injection currents for activated iridium oxide film (AIROF) microelectrodes must be limited. Anodic bias asymmetry can increase AIROF charge injection capacity, and a new system facilitates safe laboratory testing.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Neurotechnology

Background:

  • Activated iridium oxide film (AIROF) microelectrodes are used in neural interfaces.
  • Safe operation requires limiting charge-injection currents to prevent excessive voltage excursions.
  • Anodic bias asymmetry has been identified as a method to enhance AIROF charge injection capacity.

Purpose of the Study:

  • To present the design of a novel single-channel system for testing and driving AIROF microelectrodes.
  • To ensure AIROF microelectrodes operate within safe charge-injection limits during laboratory testing.

Main Methods:

  • Design and implementation of a single-channel testing and driving system.
  • Utilizing charge-balanced biphasic or monophasic current pulsing.

Related Experiment Videos

  • Incorporating anodic bias asymmetry to manage charge injection.

    • Main Results:

    • The designed system effectively controls charge-injection currents for AIROF microelectrodes.
    • The system allows for laboratory testing within established safe operational voltage limits.
    • Demonstrated the feasibility of using anodic bias asymmetry within the system.

    Conclusions:

    • The developed system provides a safe and controlled environment for AIROF microelectrode characterization.
    • This system supports further research into optimizing AIROF microelectrode performance for neural applications.
    • Safe charge injection is crucial for the reliable and long-term use of AIROF microelectrodes.