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Related Experiment Videos

A batch-manufacturable uniform current density metallic-shell hemispherical microelectrode.

Joe Guimont1, Babak Ziaie

  • 1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, 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
PubMed
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We simulated microelectrodes for safe neural stimulation. Metallic-shell hemispherical designs offer uniform current density and are compatible with microfabrication, outperforming planar electrodes.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Microelectrodes are crucial for neural stimulation in research and clinical applications like neural prostheses.
  • Achieving uniform current density is essential for safe and effective neural stimulation.
  • Existing microelectrode designs present challenges in fabrication compatibility and current distribution.

Purpose of the Study:

  • To simulate and compare the current density profiles of different microelectrode designs.
  • To identify microelectrode structures suitable for batch manufacturing and safe neural stimulation.
  • To evaluate the compatibility of microelectrode designs with integrated circuit and Micro-Electro-Mechanical Systems (MEMS) fabrication.

Main Methods:

  • Utilized Maxwell 3D software for electromagnetic simulations.

Related Experiment Videos

  • Modeled three microelectrode geometries: recessed planar, solid-metallic hemispherical, and metallic-shell hemispherical.
  • Analyzed current density distribution and uniformity across the simulated structures.

    • Main Results:

    • Metallic-shell hemispherical microelectrodes demonstrated uniform current density profiles.
    • No significant difference in current density was observed between solid-metallic and metallic-shell hemispherical designs.
    • Hemispherical microelectrodes, particularly the metallic-shell type, showed superior current distribution compared to recessed planar electrodes.
    • Metallic-shell designs exhibited greater compatibility with integrated circuit and MEMS fabrication.

    Conclusions:

    • Metallic-shell hemispherical microelectrodes are a promising design for batch-manufacturable, safe neural stimulation.
    • These electrodes offer improved current density distribution over planar designs.
    • The metallic-shell design is well-suited for integration with advanced microfabrication technologies for neural prostheses.