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Passive telemetry system for implantable medical device

  • US 20020147388A1
  • Filed: 04/06/2001
  • Published: 10/10/2002
  • Est. Priority Date: 04/06/2001
  • Status: Active Grant
First Claim
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1. A telemetry system for enabling data transfer from an implantable medical device to an external device, comprising:

  • an external device having an antenna and a transmitter for transmitting a radio-frequency carrier signal to an antenna of the implantable device;

    an implantable device having an antenna and a tuning circuit for adjusting the impedance of the antenna in a time varying manner so as to phase modulate a carrier signal reflected therefrom in accordance with a digital data signal; and

    , a receiver in the external device for receiving the phase modulated carrier signal reflected from the antenna of the implantable device and extracting the digital data signal therefrom.

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