Blood pressure estimating apparatus and method

Details Blood pressure estimating apparatus and method Blood pressure estimating apparatus and method

1998-05-29

2000-02-22

O'Connor, Cary

Surgery

Diagnostic testing

Cardiovascular

600494, 600485, A61B 5021, A61B 502

Patent

active

060274557

ABSTRACT:
An apparatus for estimating an intraarterial blood pressure of a living subject, based on information of the subject, including: a first device for obtaining first information which relates to velocity of propagation of a pulse wave; a second device for obtaining at least one of second information which relates to heart rate and third information which relates to an area defined by a volume pulse wave; a third device 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 blood pressure of the subject, based on the first information and the at least one of the second and the third information, the relationship being defined by a numerical expression including a plurality of coefficients; a fourth device for determining an activity of an autonomic nerve system, based on at least one of fourth information which relates to fluctuations of the blood pressure and fifth information which relates to fluctuations of the heart rate; and a fifth device for changing, based on the activity of the autonomic nerve system, at least one of the coefficients of the expression, so that the expression including the changed coefficient amplifies a change of an estimated blood pressure from a prior estimated blood pressure.

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