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Medical instrument for noninvasive measurement of cardiovascular characteristics

  • US 4,519,395 A
  • Filed: 12/15/1982
  • Issued: 05/28/1985
  • Est. Priority Date: 12/15/1982
  • Status: Expired due to Term
First Claim
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1. An apparatus for noninvasive quantitative measurement of characteristics of a cardiovascular system of a human object, the instrument comprising:

  • noninvasive pulse transducer means for providing signal pulses representative of sensed heart beats of the human subject;

    voluntary cardiorespiratory synchronization means responsive to the signal pulses for providing stimulae which permit the human subject to voluntarily synchronize the subject'"'"'s respiratory cycles with the subject'"'"'s heart beats;

    instantaneous heart rate measurement means responsive to the signal pulses for providing digital data representative of instantaneous heart rate at each heart beat of a plurality of N-beat voluntarily synchronized respiratory cycles;

    data sorting means for sorting the digital data by each of N-beat categories;

    data analysis means for analyzing the sorted digital data to derive a digital value indicative of a characteristic of the subject'"'"'s cardiovascular system; and

    output means for providing a human perceivable output as a function of the derived digital value.

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