Method and apparatus for non-invasive, cuffless continuous blood pressure determination

  • US 5,857,975 A
  • Filed: 05/18/1998
  • Issued: 01/12/1999
  • Est. Priority Date: 10/11/1996
  • Status: Expired due to Fees
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First Claim
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1. Method for determining systolic blood pressure in a subject comprising:

  • detecting an EKG for the subject;

    selecting a fiducial point on the EKG during a pulse;

    monitoring blood volume versus time at a selected location on the subject'"'"'s body;

    determining time difference between occurrence of the selected fiducial point and occurrence of a selected change in blood volume at the selected body location;

    determining heart rate from the EKG; and

    computing systolic pressure based on the time difference and heart rate, wherein systolic pressure, PS(i), is determined by computing
    
    
    space="preserve" listing-type="equation">P.sub.S(i) =(K.sub.Sv *v.sub.p(i).sup.2)+K.sub.Scalwherein KSv is a constant; and

    KScal is a calibration constant;

    vp(i) is the pulse velocity; and

    i refers to the ith pulse.

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