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Optrode Array for Simultaneous Optogenetic Modulation and Electrical Neural Recording
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Design, fabrication, and packaging of an integrated, wirelessly-powered optrode array for optogenetics application.

Ki Yong Kwon1, Hyung-Min Lee2, Maysam Ghovanloo2

  • 1Department of Electrical and Computer Engineering, Michigan State University East Lansing, MI, USA.

Frontiers in Systems Neuroscience
|May 23, 2015
PubMed
Summary

This study presents a wirelessly-powered optrode neural interface using microscale LEDs for optogenetic studies. The flexible, biocompatible device enables precise optical modulation and neural recording in freely behaving animals.

Keywords:
implantable neural interfacemicroelectromechanical systemsoptogeneticsoptrode arrayswitched-capacitor based stimulatorswireless power transfer

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • Optogenetics requires advanced tools for precise neural circuit modulation.
  • Existing optogenetic tools face limitations in power delivery, size, and biocompatibility for chronic use.

Purpose of the Study:

  • To design, fabricate, and package a wirelessly-powered, LED-coupled optrode neural interface for optogenetic applications.
  • To develop a scalable, cost-effective, and biocompatible system for neural modulation and recording.

Main Methods:

  • Utilized microscale LEDs (μLEDs) and polymer microwaveguides for light delivery to cortical networks.
  • Integrated microelectrodes for simultaneous neural activity recording.
  • Developed an implantable switched-capacitor based stimulator (SCS) system with inductive power transfer.

Main Results:

  • Demonstrated a mechanically flexible, biocompatible, miniaturized, and lightweight optrode array.
  • Achieved wireless power delivery enabling sufficient light emission for neural activation.
  • Showcased scalability and cost-effectiveness through microelectromechanical systems (MEMS) batch fabrication.

Conclusions:

  • The developed LED-coupled optrode neural interface is suitable for chronic implantation in small freely behaving animals.
  • The system offers a versatile platform for optogenetic studies, adaptable for various experimental needs.
  • This technology advances engineering tools for optical modulation of neural circuitry.