Blood pressure algorithm
First Claim
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1. A method for measuring non-invasive blood pressure from an oscillometric signal and a cuff pressure signal, said method implemented in a medical apparatus, comprising:
- (a) calculating a pulse pressure signal by subtracting an upper and a lower envelope of said oscillometric signal based on rank-order filters applied to said oscillometric signals; and
(b) calculating a mean arterial pressure, a systolic blood pressure, and a diastolic blood pressure from said oscillometric signal, said cuff pressure signal, and a plurality of thresholds using a device with at least one processor.
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Abstract
A apparatus and method for non-invasively measuring blood pressure. Cuff pressure and oscillometric signals are generated. The signals are conditioned by a plurality of linear filters to remove artifacts and local trends. Rank-order filters are applied to the conditioned oscillometric signal to detect upper and lower envelops. The systolic blood pressure and diastolic blood pressure are calculated using a plurality of multidimensional threshold vectors.
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Citations
9 Claims
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1. A method for measuring non-invasive blood pressure from an oscillometric signal and a cuff pressure signal, said method implemented in a medical apparatus, comprising:
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(a) calculating a pulse pressure signal by subtracting an upper and a lower envelope of said oscillometric signal based on rank-order filters applied to said oscillometric signals; and (b) calculating a mean arterial pressure, a systolic blood pressure, and a diastolic blood pressure from said oscillometric signal, said cuff pressure signal, and a plurality of thresholds using a device with at least one processor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for non-invasive measurement of blood pressuring, comprising:
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(a) a signal acquisition circuit to acquire a cuff pressure signal using an inflatable cuff, and to generate an oscillometric signal from said cuff pressure signal; (b) a memory to store said cuff pressure signal, said oscillometric signal, a plurality of processing steps; and
a plurality of processing results; and(c) a processor configured to perform the processing steps of; (1) calculating a pulse pressure signal without the use of a beat detection algorithm by subtracting an upper and a lower envelope of said oscillometric signal based on rank-order filters applied to said oscillometric signals; and (2) calculating a mean arterial pressure, a systolic blood pressure, and a diastolic blood pressure from said oscillometric signal, said cuff pressure signal, and a plurality of thresholds; and
storing the results in said memory. - View Dependent Claims (9)
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Specification