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Neural Activity Propagation in an Unfolded Hippocampal Preparation with a Penetrating Micro-electrode Array
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Neural recording chip with penetrating Si microprobe electrode array by selective vapor-liquid-solid growth method.

Takeshi Kawano1, Hidekuni Takao, Kazuaki Sawada

  • 1Department of Electrical and Electric Engineering, Toyohashi University of Technology, Japan.

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
Summary

This study developed novel neural recording devices using silicon microprobe electrode arrays. These microprobes offer precise control over dimensions and reduced impedance for enhanced neural signal acquisition.

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Area of Science:

  • Neuroscience
  • Materials Science
  • Electrical Engineering

Background:

  • Neural recording technologies are crucial for understanding brain function.
  • Existing electrode arrays face challenges in miniaturization and impedance control.
  • Integrated circuit (IC) processes offer potential for advanced neural probe fabrication.

Purpose of the Study:

  • To develop a neural recording chip device with penetrating silicon (Si) microprobe electrode arrays.
  • To investigate the fabrication of Si microprobes with controlled dimensions using selective vapor-liquid-solid (VLS) growth.
  • To characterize the electrical properties, specifically impedance, of the fabricated microprobes for neural recording applications.

Main Methods:

  • Fabrication of Si microprobe electrode arrays using IC processes and selective VLS growth.
  • Controlled growth of Si probes with a diameter of 2 µm and length of 60 µm.
  • Encapsulation of conductive Si probes with silicon dioxide (SiO2) layers.
  • Coating Si probe tips with a gold (Au) metal layer to reduce impedance.
  • Packaging the probe chip with a fluid-tight chamber and a flexible-printed-circuit (polyimide) for experiments.

Main Results:

  • Successfully fabricated conductive Si microprobes with precise diameter and length control.
  • Achieved impedance values in the range of 300 kΩ to 500 kΩ at 1 kHz for microprobes in saline solution.
  • Developed packaging techniques suitable for neural recording experiments.

Conclusions:

  • The developed Si microprobe electrode arrays are suitable for neural recording applications.
  • The fabrication method allows for controlled dimensions and reduced impedance, enhancing signal acquisition.
  • The packaging techniques ensure the integrity and functionality of the neural recording device.