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Remotely interrogated diagnostic implant device with electrically passive sensor

  • US 6,206,835 B1
  • Filed: 03/24/1999
  • Issued: 03/27/2001
  • Est. Priority Date: 03/24/1999
  • Status: Expired due to Fees
First Claim
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1. An implant device responsive to an interrogation circuit having an exciter/interrogator element which is located outside a living animal, the implant device comprising:

  • a structure implantable within the living animal and operatively configured to carry out or assist in carrying out a function within the living animal;

    an electrically passive sensing circuit integral with the structure for sensing a parameter associated with the function, the sensing circuit including an inductive element wherein the sensing circuit has a frequency dependent variable impedance loading effect on the interrogation circuit in response to an interrogation signal provided by the exciter/interrogator element, the impedance loading effect varying in relation to the sensed parameter.

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