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Optrode Array for Simultaneous Optogenetic Modulation and Electrical Neural Recording
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A wireless implantable switched-capacitor based optogenetic stimulating system.

Hyung-Min Lee, Ki-Yong Kwon, Wen Li

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
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    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a power-efficient wireless switched-capacitor stimulating (SCS) system for optogenetics. The system delivers high power to micro-LEDs for neural stimulation and recording, enabling efficient brain-computer interfaces.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Electrical Engineering

    Background:

    • Optogenetic stimulation requires efficient power delivery for implantable devices.
    • Existing systems face challenges in providing high instantaneous power wirelessly without compromising system stability.
    • Simultaneous neural recording and optical stimulation are crucial for advanced brain-machine interfaces.

    Purpose of the Study:

    • To develop a power-efficient, wireless implantable optogenetic interface.
    • To enable high-instantaneous-power optical stimulation using a switched-capacitor system.
    • To integrate neural recording capabilities with optical stimulation.

    Main Methods:

    • A wireless switched-capacitor stimulating (SCS) system was designed and implemented in 0.35-μm CMOS.
    • The SCS system charges storage capacitors from an inductive link and discharges them into micro-LEDs.
    • A custom LabVIEW interface controlled stimulation parameters wirelessly, coupled with an optrode array for neural recording.

    Main Results:

    • A 4-channel SCS system prototype was successfully fabricated and integrated with an optrode array.
    • In vivo experiments demonstrated the system's efficacy through light-induced local field potentials.
    • The system provided high instantaneous power to micro-LEDs without disrupting the wireless link or supply voltage.

    Conclusions:

    • The developed SCS system offers a power-efficient solution for wireless optogenetic stimulation.
    • The integrated system enables simultaneous neural recording and optical stimulation.
    • Further development for chronic implantation with flexible hermetic sealing is underway.