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Analog and digital telemetry system for an implantable device

  • US 4,681,111 A
  • Filed: 04/05/1985
  • Issued: 07/21/1987
  • Est. Priority Date: 04/05/1985
  • Status: Expired due to Term
First Claim
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1. A system for simultaneously transmitting digital and analog information from an implanted device to an external device, said system comprising:

  • frequency modulation means within said implanted device for generating a carrier signal and frequency modulating said carrier signal with analog information;

    shift register means within said implanted device for holding digital data, said shift register means including means for serially clocking the digital data out of said shift register means in response to a clock signal;

    means for applying said frequency modulated carrier signal from said frequency modulation means to said shift register means, said frequency modulated carrier signal comprising the clock signal that is used to serially clock the digital data out of said shift register means; and

    transmitting means within said implanted device for serially transmitting to said external device the digital data clocked out of said shift register means by said frequency modulated carrier signal, whereby both said digital data and the analog information, used to modulate said frequency modulated carrier signal, are contained in the signal transmitted by said transmitting means.

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