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Personal physiological monitor

  • US 4,509,531 A
  • Filed: 07/28/1982
  • Issued: 04/09/1985
  • Est. Priority Date: 07/28/1982
  • Status: Expired due to Term
First Claim
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1. Apparatus for physiological monitoring of a subject comprising:

  • temperature sensing means for generating a temperature signal indicative of the temperature therof, said temperature sensing means including a thermistor having a predetermined temperature coefficient;

    means for disposing said temperature sensitive means in thermal contact with said subject;

    reference means, responsive to control signals applied thereto, for selectively generating a temperature reference signal indicative of a threshold temperature, said reference means including;

    storage means for controllably storing indicia of the instantaneous temperature, as a stored reference temperature, said threshold temperature being in predetermined relation with said stored reference temperature, andaccumulator means, responsive to enable control signals and clock signals applied thereto, for selectively accumulating a count when enabled and controllably storing said count;

    digital to analog converter means, responsive to said count, for providing a current to said thermistor to develop a temperature voltage across said thermistor indicative of the instantaneous temperature, the magnitude of said current varying in accordance with said count;

    temperature comparison means, responsive to said temperature signal and said temperature reference signal, for generating a temperature comparison signal indicative of a comparison between said temperature and reference signals;

    means, responsive to control signals applied thereto, for alternatively generating at least an accumulation reference voltage and a threshold reference voltage to said comparison means, said threshold reference voltage differing from said accumulation reference voltage in accordance with said predetermined relation between said threshold temperature and said stored reference temperature;

    gating means, responsive to said comparison signal, for selectively applying said clock signals to said accumulator means;

    alarm means, responsive to said temperature comparison signal, for selectively generating alarm indicia; and

    control means for generating said control signals to said reference means to effect storage of said temperature indicia;

    wherein said control means generates control signals to effect generation of said accumulation reference voltage during periods when said accumulator means is enabled such that said count is accumulated until the instantaneous temperature voltage is approximately equal to said accumulation reference voltage, said accumulation voltage thereby being equated to said stored reference temperature and said threshold reference voltage being equated to said threshold temperature, said control means also generating control signals to effect generation of said threshold reference voltage during periods when said count is stored.

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