Cardiovascular information measurement system
First Claim
1. A cardiovascular information measurement system characterized by comprising:
- sectional shape detection means for simultaneously detecting sectional shapes of at least two arterial portions;
cross-sectional area calculation means for calculating cross-sectional areas of the two arterial portions on the basis of the sectional shapes detected by said sectional shape detection means;
flow velocity calculation means for calculating an average blood flow velocity in an artery on the basis of the cross-sectional areas calculated by said cross-sectional area calculation means;
pulse wave velocity calculation means for calculating a pulse wave propagation velocity between the two arterial portions in accordance with time changes in the sectional shapes of the two arterial portions which are detected by said sectional shape detection means;
relative blood pressure calculation means for calculating a relative blood pressure value to a reference blood pressure value obtained in a specific time phase, on the basis of the blood flow velocity calculated by said flow velocity calculation means and the pulse wave velocity calculated by said pulse wave velocity calculation means; and
absolute blood pressure calculation means for calculating an absolute blood pressure value on the basis of the relative blood pressure value and the reference blood pressure value obtained in the specific time phase and measured in advance.
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Abstract
It is an object of the present invention to provide a cardiovascular information measurement system capable of performing an accurate blood pressure measurement and calculating an accurate cardiovascular index in consideration of the pulsation of a blood vessel wall. To achieve this object, the cardiovascular information measurement system includes ultrasonic transducer groups (4a, 4b) for simultaneously detecting sectional shapes (3a, 3b) of two arterial portions, a cross-sectional area calculation unit (5) for calculating cross-sectional areas of the two arterial portions on the basis of the detected sectional shapes, a flow velocity calculation unit (6) for calculating an average blood flow velocity in an artery on the basis of the cross-sectional areas calculated by the cross-sectional area calculation unit (5), a pulse wave velocity calculation unit (7) for calculating a pulse wave propagation velocity between the two arterial portions in accordance with time changes in the detected sectional shapes of the two arterial portions, a relative blood pressure calculation unit (8) for calculating a relative blood pressure value to a reference blood pressure value obtained in a specific time phase, on the basis of the calculated blood flow velocity and the calculated pulse wave propagation velocity, and an absolute blood pressure calculation unit (10) for calculating an absolute blood pressure value on the basis of the relative blood pressure value and the reference blood pressure value obtained in the specific time phase and measured in advance.
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Citations
18 Claims
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1. A cardiovascular information measurement system characterized by comprising:
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sectional shape detection means for simultaneously detecting sectional shapes of at least two arterial portions;
cross-sectional area calculation means for calculating cross-sectional areas of the two arterial portions on the basis of the sectional shapes detected by said sectional shape detection means;
flow velocity calculation means for calculating an average blood flow velocity in an artery on the basis of the cross-sectional areas calculated by said cross-sectional area calculation means;
pulse wave velocity calculation means for calculating a pulse wave propagation velocity between the two arterial portions in accordance with time changes in the sectional shapes of the two arterial portions which are detected by said sectional shape detection means;
relative blood pressure calculation means for calculating a relative blood pressure value to a reference blood pressure value obtained in a specific time phase, on the basis of the blood flow velocity calculated by said flow velocity calculation means and the pulse wave velocity calculated by said pulse wave velocity calculation means; and
absolute blood pressure calculation means for calculating an absolute blood pressure value on the basis of the relative blood pressure value and the reference blood pressure value obtained in the specific time phase and measured in advance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cardiovascular information measurement system characterized by comprising:
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ultrasonic emission means for emitting an ultrasonic wave toward a blood vessel;
ultrasonic wave detection means for detecting an ultrasonic wave reflected in a living body;
binarization means for setting an appropriate threshold value in accordance with an angle between an incident direction of the ultrasonic wave and a blood vessel wall and binarizing an output signal from said ultrasonic detection means; and
index calculation means for calculating a cardiovascular index on the basis of blood vessel sectional shape information obtained from information binarized by said binarization means. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification