External temperature and pulse rate sensing and transmitting device

Claim 1

A temperature and pulse rate sensing and transmitting device having in combination a housing of small thickness for attachment at one side thereof to the chest wall of a patient, a transistorized R.F. transmission circuit encapsulated within said housing, said circuit comprising a blocking oscillator circuit including an inductance coil and a variable capacitor, said coil and said capacitor being calibrated to transmit a specific carrier frequency to indicate a normal pulse rate, a metal plate member carried at the inner side of said one side of said housing in close proximity to said coil and vibrating in response to the pressure of the heartbeat of said patient varying the inductance of said coil responsive to changes in the rate of said heartbeat shifting said carrier frequency accordingly, said circuit including a blocking capacitor and a variable resistor, said capacitor and resistor being calibrated to have said circuit transmit a specific blocking rate to indicate a normal body temperature, a thermal resistance element in circuit with said variable resistor and blocking capacitor shifting said blocking rate in accordance with and in response to changes in body temperature, whereby shifts in said carrier frequency and in said blocking rate of the signals transmitted by said circuit indicate changes of pulse rate and body temperature.