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Ingestible ph responsive radio transmitter

  • US 3,340,866 A
  • Filed: 07/01/1964
  • Issued: 09/12/1967
  • Est. Priority Date: 12/31/1958
  • Status: Expired due to Term
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8. AN INTERNAL RADIO PROBE FOR MEASURING HYDROGEN ION IN THE DIGESTIVE TRACT COMPRISING, IN COMBINATION:

  • (A) A TRANSISTOR OSCILLATOR;

    (B) BATTERY MEANS FOR ENERGIZING SAID OSCILLATOR WHEN IMERSED IN THE FLUIDS OF SAID DIGESTIVE TRACT;

    (C) PH SENSING MEANS IN CIRCUIT WITH SAID OSCILLATOR FOR VARYING THE FREQUENCY OF OSCILLATION OF SAID OSCILLATOR RESPONSIVE TO A SENSED PH, SAID BATTERY MEANS AND SAID PH SENSING MEANS EACH INCLUDING TWO SPACED

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