System and method for evaluating the circulatory system of a living subject
First Claim
1. A device for evaluating a circulatory system of a living subject, comprising:
- a blood-pressure changing device that changes a blood pressure of the living subject;
a blood-pressure measuring device that measures the blood pressure of the living subject while the living subject'"'"'s blood pressure is changing;
an oscillatory pressure-pulse wave detector that detects oscillatory pressure-pulse waves of the living subject while the living subject'"'"'s blood pressure is changing, the oscillatory pressure-pulse waves produced by a cardiac muscle of the living subject propagating along an artery of the living subject;
an electrocardiographic waveform detector that detects an electrocardiographic waveform of the living subject;
a time-difference determining circuit that determines time differences between predetermined periodic points on the electrocardiographic waveform of the living subject and predetermined periodic points on corresponding oscillatory pressure-pulse waves of the living subject; and
a circulatory-system evaluation circuit that evaluates the living subject'"'"'s circulatory system based on a relationship between changes in the living subject'"'"'s blood pressure and changes in the corresponding time differences determined by the time-difference determining circuit.
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Accused Products
Abstract
A system that accurately evaluates a living subject'"'"'s circulatory system, even if the living subject is taking high blood pressure medication includes a time-difference determining device that determines a time difference between predetermined periodic points on a subject'"'"'s electrocardiographic waveform and predetermined periodic points on corresponding oscillatory pressure-pulse waves of the living subject. A strain application device applies a physical strain to the subject'"'"'s body for a predetermined period of time so that the subject'"'"' blood pressure changes. A blood-pressure measurement device measures the subject'"'"'s blood pressure while the subject'"'"'s blood pressure is changing. A circulatory-system evaluation device determines a relationship between changes in the subject'"'"'s blood pressure and corresponding time differences determined by the time-difference determining. The circulatory-system evaluation device evaluates the subject'"'"'s circulatory system based on the hysteresis present in the relationship.
96 Citations
40 Claims
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1. A device for evaluating a circulatory system of a living subject, comprising:
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a blood-pressure changing device that changes a blood pressure of the living subject; a blood-pressure measuring device that measures the blood pressure of the living subject while the living subject'"'"'s blood pressure is changing; an oscillatory pressure-pulse wave detector that detects oscillatory pressure-pulse waves of the living subject while the living subject'"'"'s blood pressure is changing, the oscillatory pressure-pulse waves produced by a cardiac muscle of the living subject propagating along an artery of the living subject; an electrocardiographic waveform detector that detects an electrocardiographic waveform of the living subject; a time-difference determining circuit that determines time differences between predetermined periodic points on the electrocardiographic waveform of the living subject and predetermined periodic points on corresponding oscillatory pressure-pulse waves of the living subject; and a circulatory-system evaluation circuit that evaluates the living subject'"'"'s circulatory system based on a relationship between changes in the living subject'"'"'s blood pressure and changes in the corresponding time differences determined by the time-difference determining circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device for evaluating a circulatory system of a living subject, comprising:
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a blood-pressure changing device that changes a blood pressure of the living subject; a blood-pressure measuring device that measures the blood pressure of the living subject while the living subject'"'"'s blood pressure is changing; an electrocardiographic waveform detector that detects an electrocardiographic waveform of the living subject; an oscillatory pressure-pulse wave detector that detects oscillatory pressure-pulse waves of the living subject while the living subject'"'"'s blood pressure is changing, that oscillatory pressure-pulse wave produced by a cardiac muscle of the living subject and propagating along an artery of the living subject; an oscillatory pressure-pulse wave velocity determining device that determines propagation velocities of the oscillatory pressure-pulse waves; and a circulatory-system evaluation circuit that evaluates the living subject'"'"'s circulatory system based on a relationship between changes in the living subject'"'"'s blood pressure and changes in the propagation velocities of corresponding oscillatory pressure-pulse waves. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A device for evaluating a circulatory system of a living subject, comprising:
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a blood-pressure measuring device that successively measures the blood pressure of the living subject while the living subject is subjected to a physical load; a means for creating the physical load; a pressure-pulse wave propagation velocity information obtaining device that, while the living subject is subjected to the physical load, successively obtains pressure-pulse wave propagation velocity information relating to a propagation velocity of a pressure-pulse wave through an artery of the living subject; and a circulatory-system evaluation circuit that evaluates the circulatory system of the living subject based on a relationship between changes in the blood pressure of the living subject and changes in the pressure-pulse wave propagation velocity information. - View Dependent Claims (27, 28, 29, 30, 31)
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32. A method of evaluating a circulatory system of a living subject, comprising:
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changing a blood pressure of the living subject over a predetermined period of time; measuring the subject'"'"'s blood pressure while the subject'"'"'s blood pressure is changing; measuring oscillatory pressure-pulse waves of the living subject while the living subject'"'"'s blood pressure is changing, the oscillatory pressure-pulse waves produced by a cardiac muscle of the living subject and propagating along an artery of the living subject; measuring an electrocardiographic waveform of the living subject while the living subject'"'"'s blood pressure is changing; determining time differences between predetermined periodic points on the electrocardiographic waveform of the living subject and predetermined periodic points on corresponding oscillatory pressure-pulse waves of the living subject; and evaluating the living subject'"'"'s circulatory system based on a relationship between changes in the living subject'"'"'s blood pressure and changes in corresponding time differences. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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Specification