Blood pressure estimating apparatus and method
First Claim
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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Accused Products
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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Citations
18 Claims
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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:
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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, and fifth 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of successively estimating an intraarterial blood pressure of a living subject, based on information non-invasively obtained from a circulatory organ of the subject, comprising the steps of:
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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, 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, 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 obtained first information and the obtained at least one of the second information and the third information, the predetermined relationship being defined by a numerical expression including a plurality of coefficients, 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, and 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. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification