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    Area of Science:

    • Biomedical Engineering
    • Electrical Engineering
    • Implantable Devices

    Background:

    • Wireless power transmission (WPT) is crucial for powering implantable medical devices.
    • Existing WPT methods face challenges with precise alignment and powering multiple distributed implants within biological tissues.

    Purpose of the Study:

    • To present a novel inductive link for wireless power transmission to mm-sized free-floating implants (FFIs) in neural tissue.
    • To develop a WPT system that is insensitive to the exact location of multiple receivers (Rx).

    Main Methods:

    • Utilized a high-Q resonator on a wirelessly powered plane encompassing randomly positioned FFIs.
    • Employed resonant WPT fundamentals for optimization of FFIs.
    • Conducted simulations using HFSS finite element models for design strategies and safety analysis (SAR limits).
    • Built and tested FFI prototypes for performance characterization.

    Main Results:

    • Achieved 2.4% power transfer efficiency for 1-mm receivers operating at 60 MHz.
    • Delivered 1.3 mW of power to the load.
    • Demonstrated functionality within 14-18 mm transmitter-receiver (Tx-Rx) separation and over a 7 cm² brain surface area.

    Conclusions:

    • The proposed WPT method enables efficient power delivery to multiple, randomly distributed mm-sized FFIs in neural tissue.
    • The system's location insensitivity and safety considerations are validated through simulations and prototype measurements.
    • This technology holds promise for advanced neural implants and other biomedical applications requiring untethered power.