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Blood pressure estimating apparatus and method

  • US 6,027,455 A
  • Filed: 05/29/1998
  • Issued: 02/22/2000
  • Est. Priority Date: 05/12/1998
  • Status: Expired due to Term
First Claim
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1. An apparatus for successively estimating an intraarterial blood pressure of a living subject, based on information non-invasively obtained from a circulatory organ of the subject, comprising:

  • first means for non-invasively obtaining, from the circulatory organ of the subject, first information which relates to velocity of propagation of a pulse wave which propagates through an artery of the subject;

    second means for non-invasively obtaining, from the circulatory organ of the subject, at least one of second information which relates to heart rate of the subject and third information which relates to an area defined by a volume pulse wave from a peripheral portion of the subject;

    third means for estimating, according to a predetermined relationship between (A) blood pressure, and (B1) first information and (B2) at least one of (B21) second information and (B22) third information, the intraarterial blood pressure of the subject, based on the first information obtained by the first means and said at least one of the second information and the third information obtained by the second means, the predetermined relationship being defined by a numerical expression including a plurality of coefficients;

    fourth means for determining an activity of an autonomic nerve system of the subject, based on at least one of fourth information which relates to fluctuations of the blood pressure of the subject and fifth information which relates to fluctuations of the heart rate of the subject, andfifth means for changing, based on the determined activity of the autonomic nerve system, at least one of the coefficients of the numerical expression, so that the numerical expression including the changed coefficient amplifies a change of an estimated blood pressure of the subject from a prior estimated blood pressure of the subject.

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