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Related Experiment Videos

"Safe" charge-injection waveforms for iridium oxide (AIROF) microelectrodes.

P R Troyk1, D E Detlefsen, 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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Anodic bias enhances charge injection in activated iridium oxide (AIROF) microelectrodes. New driver circuits maintain safe operating voltages, improving electrode longevity for neural interfaces.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Electrochemistry

Background:

  • Activated iridium oxide (AIROF) microelectrodes are crucial for neural interfaces.
  • Maximizing charge injection capacity is key for effective signal recording and stimulation.
  • Electrode longevity is limited by electrochemical degradation, particularly water electrolysis.

Purpose of the Study:

  • To investigate methods for improving charge injection limits in AIROF microelectrodes.
  • To develop driver circuitry that maintains electrodes at an optimal anodic bias while ensuring electrochemical safety.
  • To enhance the long-term viability of implanted AIROF electrodes.

Main Methods:

  • Utilizing asymmetric waveforms with lower current density and longer pulse widths for the anodic phase.

Related Experiment Videos

  • Applying anodic bias to AIROF microelectrodes.
  • Designing and presenting two driver topologies incorporating compliance-voltage limitation and cathodic current modification.

    • Main Results:

    • Asymmetric waveforms enable higher anodic bias voltages, maximizing AIROF charge-injection capacity.
    • The proposed driver topologies successfully maintain electrodes at an anodic bias.
    • Electrode voltage is kept within safe limits, preventing water electrolysis and preserving electrode viability.

    Conclusions:

    • Anodic bias, particularly with optimized asymmetric waveforms, significantly improves AIROF charge injection.
    • Novel driver circuit designs offer a solution for maintaining safe operating conditions for AIROF microelectrodes.
    • These advancements contribute to more robust and long-lasting neural interface technologies.