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Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
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    Summary

    This study demonstrates an ultrasonic wireless communication link for injectable biomedical devices, achieving 70 Kbps data rates. Transmission loss increases with implant depth, impacting signal quality.

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    Area of Science:

    • Biomedical Engineering
    • Wireless Communication
    • Acoustic Engineering

    Background:

    • Injectable biomedical devices require reliable wireless communication for data transmission.
    • Ultrasound offers a potential solution for underwater or in-body communication due to its propagation characteristics.
    • Multipath propagation and signal attenuation are significant challenges for in-body ultrasonic links.

    Purpose of the Study:

    • To design and implement an ultrasonic wireless communication link for injectable biomedical implants.
    • To investigate the effects of multipath propagation on the ultrasonic link performance.
    • To characterize channel impulse response and power transmission losses as a function of implant depth.

    Main Methods:

    • Development of an ultrasonic communication link using two piezoelectric transducers operating at 320 KHz.
    • Characterization of the channel impulse response and power transmission losses.
    • Testing the link at various transmission voltages (1.8, 3.3, 20 V peak-to-peak) and implant depths (up to 12 cm).

    Main Results:

    • Achieved a data transmission rate of 70 Kbps at a depth of 12 cm.
    • Observed signal-to-noise ratios of 30, 35, and 47 dB at different transmission voltages.
    • Demonstrated that transmission loss increases with greater implant depth.

    Conclusions:

    • The designed ultrasonic link is feasible for injectable biomedical devices.
    • Multipath propagation effects and increasing depth significantly impact link performance.
    • Optimizing transmission voltage and transducer frequency is crucial for reliable in-body ultrasonic communication.