Electronic hemomanometer and blood pressure measuring method of electronic hemomanometer
First Claim
1. An electronic blood pressure monitor, comprising:
- a cuff adapted for attachment to a subject and pressurized and depressurized to measure said subject'"'"'s blood pressure;
a pulse wave detector detecting said subject'"'"'s pulse wave as said cuff occludes said subject and comprising a waveform parameter calculator calculating a wave form parameter indicative of a feature of a waveform of a pulse wave detected;
a mean blood pressure estimator estimating said subject'"'"'s estimated mean blood pressure from said pulse wave detected by said pulse wave detector;
a diastolic blood pressure detector detecting said subject'"'"'s diastolic blood pressure comprising a diastolic blood pressure calculator using said waveform parameter to calculate diastolic blood pressure; and
a systolic blood pressure calculator calculating said subject'"'"'s systolic blood pressure from said estimated mean arterial pressure, said detected diastolic blood pressure and a waveform of said pulse; and
a waveform distortion corrector correcting said waveform parameter to cancel an error introduced by a distortion of a detected pulse wave relative to said intra-arterial waveform into systolic blood pressure calculated,wherein said mean blood pressure estimator employs said waveform parameter to determine a reference pressure point within any range from a point of no more than systolic blood pressure to a point no less than a diastolic blood pressure and with reference to said reference pressure point calculates the estimated mean arterial pressure by using said waveform parameter correlated with an average value of an intra-arterial pressure waveform; and
said systolic blood pressure calculator correlates said diastolic blood pressure and said estimated mean arterial pressure to said pulse waveform'"'"'s maximum and average values and calculates a blood pressure corresponding to said pulse waveform'"'"'s maximum value point to determine systolic blood pressure.
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Abstract
Oscillometry or another method is employed to initially determine a mean blood pressure and a diastolic blood pressure. There is a similarity between an intra-arterial pressure waveform exactly representing blood pressure and a pulse wave form generated when a cuff occludes a site to be measured. This similarity is utilized to obtain blood pressure. More specifically, the cuff occludes a site to be measured, while a pulse wave is detected. From the detected pulse wave'"'"'s maximum amplitude an estimated mean arterial pressure is obtained. The obtained estimated mean arterial pressure and the pulse wave'"'"'s minimum value are regarded as a mean blood pressure and a diastolic blood pressure, respectively. From the pulse wave'"'"'s maximum value a systolic blood pressure is obtained by an arithmetic operation.
9 Citations
12 Claims
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1. An electronic blood pressure monitor, comprising:
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a cuff adapted for attachment to a subject and pressurized and depressurized to measure said subject'"'"'s blood pressure; a pulse wave detector detecting said subject'"'"'s pulse wave as said cuff occludes said subject and comprising a waveform parameter calculator calculating a wave form parameter indicative of a feature of a waveform of a pulse wave detected; a mean blood pressure estimator estimating said subject'"'"'s estimated mean blood pressure from said pulse wave detected by said pulse wave detector; a diastolic blood pressure detector detecting said subject'"'"'s diastolic blood pressure comprising a diastolic blood pressure calculator using said waveform parameter to calculate diastolic blood pressure; and a systolic blood pressure calculator calculating said subject'"'"'s systolic blood pressure from said estimated mean arterial pressure, said detected diastolic blood pressure and a waveform of said pulse; and a waveform distortion corrector correcting said waveform parameter to cancel an error introduced by a distortion of a detected pulse wave relative to said intra-arterial waveform into systolic blood pressure calculated, wherein said mean blood pressure estimator employs said waveform parameter to determine a reference pressure point within any range from a point of no more than systolic blood pressure to a point no less than a diastolic blood pressure and with reference to said reference pressure point calculates the estimated mean arterial pressure by using said waveform parameter correlated with an average value of an intra-arterial pressure waveform; and said systolic blood pressure calculator correlates said diastolic blood pressure and said estimated mean arterial pressure to said pulse waveform'"'"'s maximum and average values and calculates a blood pressure corresponding to said pulse waveform'"'"'s maximum value point to determine systolic blood pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of measuring blood pressure employing an electronic blood pressure monitor, comprising:
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providing a cuff attached to a subject and pressurizing and depressurizing the cuff in order to measure the subject'"'"'s blood pressure; detecting a pulse wave of the subject occluded by said cuff; calculating a wave form parameter indicative of a feature of a waveform of a pulse wave detected; estimating the subject'"'"'s estimated mean blood pressure from a pulse wave detected; using said waveform parameter to calculate the subject'"'"'s diastolic blood pressure; correcting said waveform parameter to cancel an error introduced by a distortion of a detected pulse wave relative to said intra-arterial waveform into systolic blood pressure calculate; and calculating the subject'"'"'s systolic blood pressure from the estimated mean arterial pressure, the detected diastolic blood pressure and the detected pulse wave'"'"'s waveform, wherein the estimating of mean blood pressure employs said waveform parameter to determine a reference pressure point within any range from a point of no more than systolic blood pressure to a point no less than a diastolic blood pressure and with reference to said reference pressure point calculates the estimated mean arterial pressure by using said waveform parameter correlated with an average value of an intra-arterial pressure waveform; and the calculating of systolic blood pressure correlates said diastolic blood pressure and said estimated mean arterial pressure to said pulse waveform'"'"'s maximum and average values and calculates a blood pressure corresponding to said pulse waveform'"'"'s maximum value point to determine systolic blood pressure.
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Specification