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Communication method for implantable medical device

  • US 6,106,551 A
  • Filed: 08/19/1997
  • Issued: 08/22/2000
  • Est. Priority Date: 02/29/1996
  • Status: Expired due to Term
First Claim
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1. An artificial heart assembly adapted to be implanted within a living subject, said artificial heart assembly comprising:

  • a blood inlet conduit;

    a blood outlet conduit;

    a pumping mechanism for periodically pumping blood from said blood inlet conduit to said blood outlet conduit;

    a DC brushless motor operatively connected to said pumping mechanism;

    a controller operatively coupled to control said pumping mechanism; and

    an implantable data communications interface operatively coupled to said controller and adapted to receive an encoded data signal from a data communications interface located outside the subject at a position remote from said artificial heart assembly, said encoded data signal received by said implantable data communications interface being transmitted in a plurality of periodic signal bursts, said periodic bursts being transmitted at a first frequency to represent a first data value and a second frequency to represent a second data value, said second frequency being different than said first frequency, each of said bursts comprising a plurality of signal transitions having a third frequency, said third frequency being greater than said first frequency and greater than said second frequency, said implantable data communications interface comprising;

    a receiver adapted to receive said encoded data signal from said remote data communications interface;

    a generator adapted to generate an envelope signal from said encoded data signal; and

    a decoder coupled to receive said envelope signal from said generator, said decoder including a detector adapted to detect which portions of said envelope signal have a frequency substantially equal to said first frequency and which portions of said envelope signal have a frequency substantially equal to said second frequency.

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