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A simple remote-controlled power switch for internalized bioelectronic instrumentation.

S M Varosi, R L Brigmon, E L Besch

    IEEE Transactions on Bio-Medical Engineering
    |August 1, 1989
    PubMed
    Summary

    A novel remote-controlled power switch extends biomedical implant battery life. This inductive-linked switch uses electromagnetic pulses to toggle power, conserving energy for longer device operation in animals and humans.

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    Area of Science:

    • Biomedical Engineering
    • Implantable Devices
    • Power Management

    Background:

    • Biomedical implants require efficient power management to extend operational lifespan.
    • Current limitations in battery life necessitate innovative solutions for implanted devices.
    • Remote control capabilities are desirable for managing implanted instrument power consumption.

    Purpose of the Study:

    • To develop and present a remote-controlled power switch for implantable biomedical instruments.
    • To enhance the battery life of implanted devices through external power control.
    • To demonstrate a low-power, inductively controlled switching mechanism.

    Main Methods:

    • A CMOS "D" flip-flop was configured as a toggle switch within the implant.
    • An inductive link between an external coil and an implanted coil enabled remote triggering.

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  • Electromagnetic pulses from the external coil controlled the implantable switch state.
  • Standby current drain was measured, and remote triggering range was evaluated.

    • Main Results:

    • The developed power switch exhibited a standby current drain of approximately 4 nA.
    • Remote triggering of the switch was achieved over a range of 20-50 cm.
    • The switch successfully toggled power states upon receiving external electromagnetic pulses.
    • The switch was tested in vivo when surgically implanted with a telemetry transmitter.

    Conclusions:

    • The remote-controlled power switch offers a viable solution for extending the battery life of biomedical implants.
    • The low standby current and effective remote triggering demonstrate the system's efficiency.
    • This technology has the potential to improve the longevity and functionality of implanted biomedical devices.
    • Further testing and integration into various biomedical instruments are warranted.