Apparatus for measuring pulse-wave propagation velocity
First Claim
1. An apparatus for measuring a propagation velocity of a pulse wave which is propagated through an artery of a living subject, the apparatus comprising:
- an electrocardiographic-waveform detecting device which detects an electrocardiographic waveform from the subject, the detected electrocardiographic waveform comprising a plurality of first heartbeat-synchronous pulses;
a pulse-wave sensor which is adapted to be worn on the subject and which detects the pulse wave from the subject, the detected pulse wave comprising a plurality of second heartbeat-synchronous pulses;
time-difference determining means for determining a time difference between a first periodic point relating to one of the first heartbeat-synchronous pulses of the detected electrocardiographic waveform and a second periodic point relating to a corresponding one of the second heartbeat-synchronous pulses of the detected pulse wave; and
propagation-velocity determining means for determining the propagation velocity, VM, of the pulse wave based on the determined time difference, TDRP, according to a following expression;
space="preserve" listing-type="equation">V.sub.M =L/(TD.sub.RP -T.sub.PEP) whereL is a length of the artery of the subject from a left ventricle of the subject via an aorta of the subject to a position where the pulse-wave sensor is worn on the subject, andTPEP is a pre-ejection period between a Q wave of said one first heartbeat-synchronous pulse of the electrocardiographic waveform and a minimum point of said corresponding one of the second heartbeat-synchronous pulses of the pulse wave.
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Abstract
An apparatus for measuring a propagation velocity of a pulse wave which is propagated through an artery of a living subject, includes an electrocardiographic-waveform detecting device which detects an electrocardiographic waveform from the subject, a pulse-wave sensor which is adapted to be worn on the subject and which detects the pulse wave from the subject, a time-difference determining device for determining a time difference between a first periodic point relating to the detected electrocardiographic waveform and a second periodic point relating to the detected pulse wave, and a propagation-velocity determining device for determining the propagation velocity of the pulse wave based on the determined time difference.
224 Citations
14 Claims
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1. An apparatus for measuring a propagation velocity of a pulse wave which is propagated through an artery of a living subject, the apparatus comprising:
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an electrocardiographic-waveform detecting device which detects an electrocardiographic waveform from the subject, the detected electrocardiographic waveform comprising a plurality of first heartbeat-synchronous pulses; a pulse-wave sensor which is adapted to be worn on the subject and which detects the pulse wave from the subject, the detected pulse wave comprising a plurality of second heartbeat-synchronous pulses; time-difference determining means for determining a time difference between a first periodic point relating to one of the first heartbeat-synchronous pulses of the detected electrocardiographic waveform and a second periodic point relating to a corresponding one of the second heartbeat-synchronous pulses of the detected pulse wave; and propagation-velocity determining means for determining the propagation velocity, VM, of the pulse wave based on the determined time difference, TDRP, according to a following expression;
space="preserve" listing-type="equation">V.sub.M =L/(TD.sub.RP -T.sub.PEP)where L is a length of the artery of the subject from a left ventricle of the subject via an aorta of the subject to a position where the pulse-wave sensor is worn on the subject, and TPEP is a pre-ejection period between a Q wave of said one first heartbeat-synchronous pulse of the electrocardiographic waveform and a minimum point of said corresponding one of the second heartbeat-synchronous pulses of the pulse wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification