NONINVASIVE METHOD AND APPARATUS FOR MEASURING BLOOD PRESSURE BY DETERMINING A MAXIMUM FREQUENCY OF SPECTRAL CONTENT OF THE SECOND HEART SOUND
First Claim
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1. A method for noninvasively estimating a blood pressure, the method comprising:
- a) applying a bandpass filter to a second heart sound (S2) component to generate a filtered S2 component, the bandpass filter having a lower cutoff frequency greater than a maximum frequency of the S2 component;
b) estimating the maximum frequency of the S2 component using the filtered S2 component;
c) applying a predetermined relationship between the estimated maximum frequency and blood pressure to generate a blood pressure estimate; and
d) displaying the blood pressure estimate.
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Abstract
Methods and apparatus for noninvasively estimating a blood pressure are provided. A bandpass filter is applied to a second heart sound (S2) component to generate a filtered S2 component. The bandpass filter has a lower cutoff frequency greater than a maximum frequency of the S2 component. The maximum frequency of the S2 component is estimated using the filtered S2 component, a predetermined relationship is applied between the estimated maximum frequency and blood pressure to generate a blood pressure estimate and the blood pressure estimate is displayed.
9 Citations
26 Claims
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1. A method for noninvasively estimating a blood pressure, the method comprising:
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a) applying a bandpass filter to a second heart sound (S2) component to generate a filtered S2 component, the bandpass filter having a lower cutoff frequency greater than a maximum frequency of the S2 component; b) estimating the maximum frequency of the S2 component using the filtered S2 component; c) applying a predetermined relationship between the estimated maximum frequency and blood pressure to generate a blood pressure estimate; and d) displaying the blood pressure estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Apparatus for noninvasively estimating a blood pressure, the apparatus comprising:
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means for applying a bandpass filter to a second heart sound (S2) component to generate a filtered S2 component, the bandpass filter having a lower cutoff frequency greater than a maximum frequency of the S2 component; means for estimating the maximum frequency of the S2 component using the filtered S2 component; means for applying a predetermined relationship between the estimated maximum frequency and blood pressure to generate a blood pressure estimate; and means for displaying the blood pressure estimate. - View Dependent Claims (15, 16, 17)
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18. A blood pressure analyzer for noninvasively estimating a blood pressure, the blood pressure analyzer comprising:
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a frequency estimator including; an estimator input port configured to receive a second heart sound (S2) component; a bandpass filter coupled to the estimator input port and configured to generate a filtered S2 component from the S2 component, the bandpass filter having a lower cutoff frequency greater than a maximum frequency of the S2 component, wherein the frequency estimator is configured to estimate the maximum frequency of the S2 component using the filtered S2 component; and a blood pressure estimator coupled to the frequency estimator and configured to apply a predetermined relationship between the estimated maximum frequency and blood pressure to generate a blood pressure estimate. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification