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Placement of Extracranial Stimulating Electrodes and Measurement of Cerebral Blood Flow and Intracranial Electrical Fields in Anesthetized Mice
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Evaluation of micro-electrocorticographic electrodes for electrostimulation.

Seth J Wilks1, Andrew S Koivuniemi, Sanitta Thongpang

  • 1Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 USA. swilks@purdue.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|December 8, 2009
PubMed
Summary

Surface modification of micro-electrocorticographic (microECoG) electrodes with electrodeposited iridium oxide (EIrOx) improved performance for neural stimulation. These enhanced microECoG devices offer better charge transfer and impedance for neurological deficit treatments.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • Chronic neural recording and stimulation using macroelectrodes show promise for neurological deficits.
  • Microfabricated electrodes offer enhanced specificity for neural population control.
  • Micro-electrocorticography (microECoG) is a key technology in this field.

Purpose of the Study:

  • To evaluate microECoG electrodes for electrostimulation applications.
  • To investigate the effects of surface modification on microECoG electrode performance.
  • To determine if electrodeposited iridium oxide (EIrOx) enhances stimulation capabilities.

Main Methods:

  • Microfabrication of dense microECoG electrode arrays.
  • Surface modification of electrodes with electrodeposited iridium oxide (EIrOx).
  • Electrochemical characterization including impedance and charge carrying capacity measurements.
  • Evaluation of voltage excursions during current-controlled stimulation.

Main Results:

  • EIrOx surface modification significantly lowered electrode impedance.
  • Modified electrodes exhibited higher charge carrying capacity.
  • Lower and more linear voltage excursions were observed during stimulation.
  • Improved electrode performance for precise neural control.

Conclusions:

  • Electrodeposited iridium oxide is a suitable surface modification for microECoG electrodes.
  • EIrOx enhances the electrochemical properties of microECoG devices for effective neural stimulation.
  • These improved electrodes hold potential for advanced neurological treatments.