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 predetermined coefficients; and
fourth means for selecting, from a plurality of groups of predetermined coefficients which correspond to a plurality of blood-pressure ranges, respectively, one group of predetermined coefficients which corresponds to a blood pressure of the subject, so that the third means estimates the intraarterial blood pressure of the subject according to the numerical expression including the selected group of predetermined coefficients.
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Accused Products
Abstract
An apparatus for estimating an intraarterial blood pressure of a living subject, based on information non-invasively obtained from a circulatory organ 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 to between (A) blood pressure, and (B1) first information and (B2) at least one of (B21) second information and (B22) third information, the blood pressure, based on the first information and the at least one of the second information and the third information, the predetermined relationship being defined by a numerical expression including a plurality of predetermined coefficients; and a fourth device for selecting, from a plurality of groups of predetermined coefficients which correspond to a plurality of blood-pressure ranges, respectively, one group of predetermined coefficients which corresponds to a blood pressure, so that the third device estimates the blood pressure according to the numerical expression including the selected group of predetermined coefficients.
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Citations
19 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 predetermined coefficients; and fourth means for selecting, from a plurality of groups of predetermined coefficients which correspond to a plurality of blood-pressure ranges, respectively, one group of predetermined coefficients which corresponds to a blood pressure of the subject, so that the third means estimates the intraarterial blood pressure of the subject according to the numerical expression including the selected group of predetermined coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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 predetermined coefficients, and selecting, from a plurality of groups of predetermined coefficients which correspond to a plurality of blood-pressure ranges, respectively, one group of predetermined coefficients which corresponds to a blood pressure of the subject, so that the intraarterial blood pressure of the subject is estimated according to the numerical expression including the selected group of predetermined coefficients. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification