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Method and system utilizing a disposable transmitter for monitoring a patient's condition

  • US 3,921,621 A
  • Filed: 08/23/1973
  • Issued: 11/25/1975
  • Est. Priority Date: 08/23/1973
  • Status: Expired due to Term
First Claim
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1. A system for monitoring the body temperature of a plurality of patients comprising:

  • a plurality of solid state electromagnetic wave energy transmitters each adapted to be carried by the body of a patient whose body temperature is to be monitored;

    means for modulating the duty cycle of the electromagnetic wave energy transmitted to each of the solid state transmitters as a function of the body temperature of the patient by which the transmitter is carried;

    a plurality of antennae each located in physical proximity to one of the patients to receive the modulated electromagnetic wave energy transmitted from the one of said plurality of transmitters carried by that patient, each of said antennae being connected to a plug; and

    , a portable monitor having means selectively connected to the plug of one of said plurality of receiving antennae to monitor the duty cycle of the received electromagnetic wave energy to thereby monitor the body temperature of a selected one of the patient, said monitor means including;

    means for detecting the duration of a cycle;

    means for detecting the duty cycle of the detected cycle;

    phase locked loop means for providing a digital signal variable in pulse repetition rate in response to said cycle duration detecting means to provide a predetermined number of pulses within the duration of the detected cycle; and

    , means responsive to said duty cycle means and to said digital signal for manifesting the value of the sensed condition, said means including;

    a bi-directional counter for counting in one direction responsively to the pulses occurring in said digital signal during the duty portion of a cycle of the received signal and for counting in the other direction during the remainder of the same cycle;

    storage means; and

    , a control pulse generator for effecting the transfer of the count in said bi-directional counter to said storage means and for effecting the resetting of said bi-directional counter at the end of each cycle.

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