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Implantable homing device

  • US 4,706,689 A
  • Filed: 01/08/1987
  • Issued: 11/17/1987
  • Est. Priority Date: 10/30/1985
  • Status: Expired due to Term
First Claim
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1. In an implantable homing device having a transmitter, and a source of power connected to apply operating current to said transmitter;

  • the improvement wherein said source of power comprises oscillator means, a battery connected to energize said oscillator means, means applying the output of said oscillator means to said transmitter as a source of operating current therefor, whereby said transmitter is intermittently operated, said transmitter comprising an oscillator and a programmable signal generator connected to provide a programmable output coded signal for modulating said oscillator, and means responsive to the voltage of said battery for controlling said programmable generator, whereby the output of said transmitter is modulated as a function of the voltage of said battery.

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