Noninvasive apparatus and method for estimating blood pressure
First Claim
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1. A method for noninvasively estimating a blood pressure, the method comprising:
- a) extracting a diastolic signal from a phonocardiogram (PCG) signal;
b) determining a target interval from the diastolic signal such that the target interval of the diastolic signal includes an S2 component;
c) extracting the S2 component from the diastolic signal using the target interval;
d) analyzing the extracted S2 component in the target interval to obtain a number of oscillations in the extracted S2 component;
e) applying a predetermined relationship between the obtained number of oscillations and blood pressure to generate a blood pressure estimate; and
f) displaying the blood pressure estimate.
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Abstract
Methods and apparatus for noninvasively estimating a blood pressure are provided. A target interval is determined from a diastolic signal such that the target interval includes an S2 component. The S2 component is extracted from the diastolic signal using the target interval and is analyzed in the target interval to obtain a number of oscillations in the S2 component. A predetermined relationship between the number of oscillations in the S2 component and blood pressure is used to generate a blood pressure estimate.
10 Citations
30 Claims
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1. A method for noninvasively estimating a blood pressure, the method comprising:
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a) extracting a diastolic signal from a phonocardiogram (PCG) signal;
b) determining a target interval from the diastolic signal such that the target interval of the diastolic signal includes an S2 component;
c) extracting the S2 component from the diastolic signal using the target interval;
d) analyzing the extracted S2 component in the target interval to obtain a number of oscillations in the extracted S2 component;
e) applying a predetermined relationship between the obtained number of oscillations and blood pressure to generate a blood pressure estimate; and
f) displaying the blood pressure estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Apparatus for noninvasively estimating a blood pressure, the apparatus comprising:
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means for obtaining a diastolic signal from a phonocardiogram (PCG) signal;
means for determining a target interval from the diastolic signal such that the target interval of the diastolic signal includes an S2 component;
means for extracting the S2 component from the diastolic signal using the target interval;
means for analyzing the extracted S2 component in the target interval to obtain a number of oscillations in the extracted S2 component;
means for applying a predetermined relationship between the obtained number of oscillations and blood pressure to generate a blood pressure estimate; and
means for displaying the blood pressure estimate. - View Dependent Claims (19, 20, 21)
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22. A blood pressure analyzer for noninvasively estimating a blood pressure, the blood pressure analyzer comprising:
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a target interval estimator configured to determine a target interval from a diastolic signal such that the target interval includes an S2 component;
a memory configured to store at least the S2 component that is extracted from the diastolic signal using the target interval;
an S2 component oscillation calculator configured to obtain a number of oscillations in the extracted S2 component using the target interval;
a blood pressure estimator configured to apply a predetermined relationship between blood pressure and the number of oscillations obtained by the S2 component oscillation calculator to generate a blood pressure estimate; and
an output port configured to provide the blood pressure estimate and at least one of the diastolic signal, the target interval and the extracted S2 component. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification