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A remotely powered implantable biomedical system with location detector.

Enver G Kilinc, Mehrdad A Ghanad, Franco Maloberti

    IEEE Transactions on Biomedical Circuits and Systems
    |July 3, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a universal remote system for powering and communicating with implantable medical devices using magnetic resonance. It enables efficient wireless power transfer and data communication with precise implant localization for enhanced medical device operation.

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    Area of Science:

    • Biomedical Engineering
    • Electrical Engineering
    • Implantable Medical Devices

    Background:

    • Current implantable medical devices require efficient remote powering and communication systems.
    • Interfacing with diverse sensors and actuators in implants presents a significant challenge.
    • Precise alignment for wireless power transfer is crucial for system efficiency.

    Purpose of the Study:

    • To present a universal remote powering and communication system for implantable medical devices.
    • To enable efficient magnetic power transfer and data exchange between external and implant units.
    • To develop a localization system for accurate alignment of the mobile external unit with the implant unit.

    Main Methods:

    • A mobile external unit controls the implantable chip and reads sensor data.
    • A locator system uses rectified voltage feedback for 6 mm resolution implant detection.
    • Sensor data is transmitted via an on-off key modulated free-running oscillator with a custom receiver.
    • Circuits fabricated in 0.18 µm CMOS technology, with a 13.56 MHz remote powering link.

    Main Results:

    • The system achieves efficient magnetic power transfer with precise implant localization.
    • The feedback mechanism allows adjustment of magnetic field strength for maximized power transfer efficiency.
    • A custom receiver tolerates large data carrier drifts for reliable data transmission.
    • The implantable chip operates at 595 μW dissipation and requires 1.48 V for startup, supplied by an on-chip voltage regulator.

    Conclusions:

    • The developed universal remote system offers a robust solution for powering and communicating with implantable medical devices.
    • The proposed localization and feedback system ensures efficient wireless power transfer and reliable data communication.
    • The system's successful fabrication and testing in CMOS technology demonstrate its potential for practical applications in medical implants.