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Drug delivery system for implantable medical device

  • US 6,689,117 B2
  • Filed: 12/18/2000
  • Issued: 02/10/2004
  • Est. Priority Date: 12/18/2000
  • Status: Expired due to Term
First Claim
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1. A method for measuring a physiological variable and drug delivery comprising:

  • applying a constant amplitude current between two implanted excitation electrodes in the form of an oscillating carrier waveform;

    measuring a physiological variable as the potential difference between two implanted sense electrodes as the constant amplitude current is applied;

    modulating the carrier waveform with command information generated by an implantable medical device to thereby cause corresponding electrical potential signals that can be sensed at a skin surface location;

    receiving and demodulating sensed potential signals at a skin surface location;

    deriving command information from the demodulated potential signals; and

    , controlling delivery of a drug from an external drug delivery device in accordance with the command information.

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