Apparatus and method for estimating blood pressure by using variable characteristic ratio
First Claim
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1. A method of estimating blood pressure, the method comprising:
- obtaining, by at least one sensor, a pressure wave detected at a measurement body part of a subject and a reference pressure wave detected at a reference measurement body part of the subject which is different from the measurement body part;
determining, by at least one processor, an index to be a difference between a blood pressure determined by applying a fixed characteristic ratio and a blood pressure having a maximum amplitude of the detected pressure wave which is transmitted by the at least one sensor;
calculating, by at least one processor, a reference characteristic ratio using the detected reference pressure wave which is transmitted by the at least one sensor;
calculating, by at least one processor, a variable characteristic ratio based on a correlation between the determined index and the reference characteristic ratio;
estimating, by at least one processor, blood pressure at the measurement body part of the subject using the calculated variable characteristic ratio; and
outputting, by an output unit, the blood pressure at the measurement body part of the subject,wherein the fixed characteristic ratio comprises a characteristic ratio which is fixed and irrespective of the shape of the pressure wave,wherein the variable characteristic ratio comprises a characteristic ratio which is a calculated characteristic ratio of the subject and variable according to the shape of the obtained pressure wave, andwherein the reference characteristic ratio comprises a characteristic ratio which is used to determine blood pressure at a measurement body part and determined using a reference blood pressure measured at the reference measurement body part.
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Abstract
Provided is a method for estimating blood pressure using a variable characteristic ratio. In the method, a pressure wave detected at a measurement body part of a subject is obtained to calculate a characteristic ratio of the subject based on a correlation between the characteristic ratio used to determine blood pressure at a measurement body part and the shape of the pressure wave detected at the measurement body part. The blood pressure at the measurement body part of the subject is estimated using the calculated characteristic ratio.
7 Citations
18 Claims
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1. A method of estimating blood pressure, the method comprising:
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obtaining, by at least one sensor, a pressure wave detected at a measurement body part of a subject and a reference pressure wave detected at a reference measurement body part of the subject which is different from the measurement body part; determining, by at least one processor, an index to be a difference between a blood pressure determined by applying a fixed characteristic ratio and a blood pressure having a maximum amplitude of the detected pressure wave which is transmitted by the at least one sensor; calculating, by at least one processor, a reference characteristic ratio using the detected reference pressure wave which is transmitted by the at least one sensor; calculating, by at least one processor, a variable characteristic ratio based on a correlation between the determined index and the reference characteristic ratio; estimating, by at least one processor, blood pressure at the measurement body part of the subject using the calculated variable characteristic ratio; and outputting, by an output unit, the blood pressure at the measurement body part of the subject, wherein the fixed characteristic ratio comprises a characteristic ratio which is fixed and irrespective of the shape of the pressure wave, wherein the variable characteristic ratio comprises a characteristic ratio which is a calculated characteristic ratio of the subject and variable according to the shape of the obtained pressure wave, and wherein the reference characteristic ratio comprises a characteristic ratio which is used to determine blood pressure at a measurement body part and determined using a reference blood pressure measured at the reference measurement body part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A blood pressure estimating apparatus comprising:
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at least one sensor configured to detect a pressure wave at a measurement body part of a subject and a reference pressure wave detected at a reference measurement body part of the subject which is different from the measurement body part; an index determination processor configured to determine a difference between a blood pressure determined by applying a fixed characteristic ratio and a blood pressure having a maximum amplitude of the detected pressure wave which is transmitted by the at least one sensor; a characteristic ratio calculation processor configured to calculate a reference characteristic ratio based on the detected reference pressure wave which is transmitted by the at least one sensor, and to calculate the variable characteristic ratio based on a determined index and a correlation between the determined index and the reference characteristic ratio; a blood pressure estimating processor configured to estimate blood pressure at the measurement body part of the subject using the calculated variable characteristic ratio; and an output unit configured to output the blood pressure at the measurement body part of the subject, wherein the fixed characteristic ratio comprises a characteristic ratio which is fixed and irrespective of the shape of the pressure wave, wherein the variable characteristic ratio comprises a characteristic ratio which is a calculated characteristic ratio of the subject, and variable according to the shape of the obtained pressure wave, and wherein the reference characteristic ratio comprises a characteristic ratio which is used to determine blood pressure at a measurement body part and determined using a reference blood pressure measured at the reference measurement body part. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification