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Method and apparatus for automatic blood pressure monitoring

  • US 5,215,096 A
  • Filed: 07/03/1991
  • Issued: 06/01/1993
  • Est. Priority Date: 10/26/1990
  • Status: Expired due to Term
First Claim
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1. Method for automatic non-invasive monitoring of a patient'"'"'s blood pressure, comprising the steps of:

  • applying a cuff (5) around a limb of the patient;

    inflating said cuff (5) to a predetermined pressure;

    step-wise reducing the pressure applied to said cuff (5);

    holding the applied pressure constant at each step until at least one superimposed oscillation caused by a heartbeat has occurred, or until a predetermined time period (tmax) has expired, whichever occurs first;

    measuring amplitudes of said superimposed oscillations and processing them in order to determine at least one of the following;

    systolic, diastolic, mean blood pressure, characterized by the steps of;

    determining a time interval between heart beats, of the patient; and

    varying said predetermined time period (tmax) in dependence on said determined time interval, such that the duration of said predetermined time period (tmax) is increased when said time interval increases.

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