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Method and apparatus for power link detection with implantable medical devices

  • US 6,321,118 B1
  • Filed: 01/27/2000
  • Issued: 11/20/2001
  • Est. Priority Date: 01/28/1999
  • Status: Expired due to Term
First Claim
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1. Transmitting apparatus usable for transmitting power to an implantable medical device that determines whether a power link has been established with the implantable medical device, comprising:

  • an RF oscillator that generates an RF signal;

    a headpiece having a transmitting coil;

    a power amplifier that amplifies the RF signal to produce an RF power signal;

    an output power path that connects the RF power signal with the transmitting coil;

    a directional coupler connected in-line with the output power path between the power amplifier and the transmitting coil, the directional coupler having a reflected power port on which a reflected power signal appears having a magnitude proportional to reflected power present on the output power path; and

    a comparator circuit that compares the reflected power signal to a threshold reference signal and that generates a power link status signal as a function of whether the reflected power signal exceeds the threshold reference signal;

    wherein the power link status signal provides a LINK or NO-LINK indication of whether a power link is established with the implantable medical device.

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