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Implant telemetry system

  • US 4,361,153 A
  • Filed: 05/27/1980
  • Issued: 11/30/1982
  • Est. Priority Date: 05/27/1980
  • Status: Expired due to Term
First Claim
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1. An apparatus for communicating variable information to an external device from an electronic stimulator implanted in a living human patient, comprisingan external unit including means for transmitting a carrier signal,a hermetically sealed fully implantable enclosure adapted to be implanted at a fixed location in the patient'"'"'s body, means within said enclosure for generating stimulator outputs,a transponder within said enclosure including tuned resonant circuit means for resonating at the frequency of said carrier signal so as to re-radiate a signal at the frequency of said carrier signal, and means for superimposing an information signal on the reflected signal by altering the resonance of said tuned circuit means in accordance with an information signal,said superimposing means including a variable impedance load connected across said tuned circuit and means for varying the impedance of said load in accordance with an information signal,said external unit further including pickup means for receiving the reflected signal from said transponder and means for recovering the information signal superimposed thereon,said receiving means including means reponsive to said reflected signal from said transponder for producing on associated analog output signal, andsaid recovering means including phase shift detector means responsive to said analog output signal for producing an output signal related to the relative phase angle thereof.

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