Telemetering system for physiological measurements

Claim 1

AN ENDORADIOSONDE SYSTEM COMPRISING TRANSMITTING MEANS INCLUDING A FIRST OSCILLATOR AND FURTHER INCLUDING DRIVE MEANS TO CONTROL THE ACTUATION AND DEACTUATION OF SAID OSCILLATOR TO PRODUCE A SERIES OF PULSES, EACH PULSE COMPRISING A PLURALITY OF CYCLES OF OSCILLATIONS OF A SELECTED FREQUENCY, A TINY PASSIVE TRANSPONDER MEANS ADAPTED TO BE DISPOSED INTERNALLY OF A LIVING BODY TO PRODUCE A FIRST ELECTRICAL SIGNAL VARYING IN ACCORDANCE WITH A PRESELECTED PHYSIOLOGICAL VARIABLE OF SAID BODY, SAID TRANSPONDER MEANS HAVING NO INTERNAL SOURCE OF POWER AND HAVING A SECOND OSCILLATION PRODUCING CIRCUIT MEANS HAVING A FEED BACK LOOP AND INCLUDING A RESONANT CIRCUIT TUNED SUBSTANTIALLY TO SAID SELECTED FREQUENCY OF THE PULSES TRANSMITTED BY SAID FIRST TRANSMITTING MEANS, SAID SECOND OSCILLATION PRODUCING MEANS INCLUDING TIMECONSTANT MEANS INCLUDIN A BLOCKING CAPACITOR TO CONTROL THE OPERATING BIAS OF SAID SECOND OSCILLATOR, A STORAGE CAPACITOR MEANS COUPLED TO SAID RESONANT CIRCUIT TO STORE SOME OF THE ENERGY RECEIVE FROM SAID TRANSMITTING MEANS BY SAID TRANSPONDER MEANS, SAID RESONANT CIRCUIT, TIME-CONSTANT BIAS MEANS AND STORAGE MEANS COUPLED TO THE FEEDBACK LOOP OF SAID SECOND OSCILLATION PRODUCING MEANS, SAID STORAGE MEANS DISCHARGING AFTER RECEIPT OF SAID TRANSMITTED PULSES THROUGH SAID TIME-CONSTANT MEANS TO PROVIDE POWER FOR SAID SECOND OSCILLATION MEANS TO PRODUCE OSCILLATIONS AFTER SAID BLOCKING CAPACITOR HAS DISCHARGED AN AMOUNT TO BIAS SAID SECOND OSCILLATING MEANS TO AN OSCILLATION OPERATING STATE, THE OSCILLATIONS FROM SAID SECOND OSCILLATION PRODUCING MEANS BEING PRODUCED AND TRANSMITTED AT A TIME INTERVAL AFTER RECEIPT OF SAID TRANSMITTED PULSES, SAID TIME-CONSTANT MEANS AND SAID RESONANT CIRCUIT HAVING AT LEAST ONE VARIABLE PARAMETER RESPONSIVE TO A PHYSIOLOGICAL STATE, AND EXTERNAL DETECTING MEANS RESPONSIVE TO THE SIGNALS FROM SAID SECOND OSCILLATING MEANS TO DETERMINE THE VARIATIONS OF SAID PHYSIOLOGICAL VARIABLE.