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Coherent inductive communications link for biomedical applications

  • US 4,561,443 A
  • Filed: 03/08/1983
  • Issued: 12/31/1985
  • Est. Priority Date: 03/08/1983
  • Status: Expired due to Fees
First Claim
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1. A communications link for communicating with a programmable medical device adapted to be biologically implanted in a living body, comprising:

  • an internal receiver located in said programmable medical device;

    an external transmitter adapted to be located extracorporeal to said living body;

    means for establishing an inductive field between said external transmitter and said internal receiver;

    a modulation means, incorporated in said external transmitter, for frequency shift keying said inductive field and for superimposing bit marks on said inductive field, so as to transmit digitally formatted information;

    a bit mark detection means, incorporated within said internal receiver, for detecting said bit marks in said inductive field;

    a limiter and zero crossing detector means, incorporated within said internal receiver, for detecting the zero crossing of the inductive field;

    a digital discriminating means, connected in association with said bit mark detection means and said limiter and zero crossing detector means, for counting the number of zero crossings of said inductive field for a preset interval after said bit mark to establish the frequency of the inductive field, wherein said frequency indicates the received binary digit.

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