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A MEMS fabricated flexible electrode array for recording surface field potentials.

Brian A Hollenberg1, Cecilia D Richards, Robert Richards

  • 1School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA.

Journal of Neuroscience Methods
|December 15, 2005
PubMed
Summary
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We created flexible, high-resolution electrode arrays for brain surface electroencephalography (EEG) recordings. These arrays offer improved signal stability and minimal tissue trauma, advancing neurological research and implantable devices.

Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • Current implantable electrode arrays face limitations in spatial resolution, signal quality, and biological compatibility.
  • Minimizing tissue trauma during implantation is critical for both acute and chronic neurological monitoring.

Purpose of the Study:

  • To develop a microfabricated flexible electrode array for high-resolution surface electroencephalography (EEG) recordings.
  • To assess the array's performance in terms of signal stability and potential for minimizing implantation trauma.

Main Methods:

  • Microfabrication of a 64-electrode array on a flexible Kapton substrate using photolithography.
  • Electrode array design optimized for insertion between the dura and skull.
  • Recording of evoked response signals to map cortical activity.

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Main Results:

  • Achieved excellent signal stability over an 8-hour recording period.
  • Demonstrated the capability to create topographical maps of cortical surface activity (e.g., whisker barrels).
  • Materials are potentially biologically inert, suggesting suitability for chronic implantation with modifications.

Conclusions:

  • The developed flexible electrode array offers enhanced spatial resolution, signal quality, and stability for surface EEG.
  • This technology has significant potential to improve outcomes in retinal prosthesis, neurosurgery, and neurological research.
  • The fabrication method allows for customizable electrode arrangements to suit specific research or clinical needs.