Method and apparatus measuring blood pressure
First Claim
1. A method of measuring a blood pressure of a subject by using a pulse wave sensor for detecting a pulse wave produced from an arterial vessel of the subject, pressing means for pressing the pulse wave sensor against the arterial vessel via a body surface of the subject, and means for detecting the magnitude of the pressing force of the pressing means, the method comprising the steps of:
- pressing said pulse wave sensor against said arterial vessel with a continuously variable pressing force produced by said pressing means;
detecting variation in the magnitude of said pulse wave with said pulse wave sensor while the pressing force of said pressing means is continuously varied;
detecting the magnitude of the pressing force of said pressing means; and
determining an actual blood pressure of the subject, according to a predetermined relationship between blood pressure and the pressing force of said pressing means, based on the detected magnitude variation of the pulse wave and the detected magnitude of the pressing force of said pressing means.
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Abstract
A method and an apparatus for measuring blood pressure of a subject by using a pulse wave sensor for detecting pulse wave produced from an arterial vessel of the subject, and pressing device for pressing the pulse wave sensor against the arterial vessel via a body surface of the subject, the method comprising the steps of pressing the pulse wave sensor against the arterial vessel with a continuously variable pressing force produced by the pressing device, detecting variation in magnitude of the pulse wave with the pulse wave sensor while the pressing force of the pressing device is continuously varied, and determining blood pressure of the subject based on the detected magnitude variation of the pulse wave.
55 Citations
19 Claims
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1. A method of measuring a blood pressure of a subject by using a pulse wave sensor for detecting a pulse wave produced from an arterial vessel of the subject, pressing means for pressing the pulse wave sensor against the arterial vessel via a body surface of the subject, and means for detecting the magnitude of the pressing force of the pressing means, the method comprising the steps of:
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pressing said pulse wave sensor against said arterial vessel with a continuously variable pressing force produced by said pressing means; detecting variation in the magnitude of said pulse wave with said pulse wave sensor while the pressing force of said pressing means is continuously varied; detecting the magnitude of the pressing force of said pressing means; and determining an actual blood pressure of the subject, according to a predetermined relationship between blood pressure and the pressing force of said pressing means, based on the detected magnitude variation of the pulse wave and the detected magnitude of the pressing force of said pressing means. - View Dependent Claims (2, 3)
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4. A method of continuously measuring blood pressures of a subject by using a pulse wave sensor for continuously detecting a pulse wave produced from an arterial vessel of the subject, pressing means for pressing the pulse wave sensor against the arterial vessel via a body surface of the subject, and means for detecting the magnitude of the pressing force of the pressing means, the pulse wave consisting of a plurality of pulses, the method comprising the steps of:
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pressing said pulse wave sensor against said arterial vessel with continuously variable pressing force produced by said pressing means; detecting variation in the magnitudes of the pulses of said pulse wave with said pulse wave sensor while the pressing force of said pressing means is continuously varied; detecting the magnitude of the pressing force of said pressing means; determining an actual blood pressure of the subject according to a predetermined relationship between blood pressure and the pressing force of said pressing means, based on the detected magnitude variation of the pulses of the pulse wave and the detected magnitude of the pressing force of said pressing means; selecting, from the detected pulses of the pulse wave, a maximum pulse having a maximum amplitude; maintaining the pressing force of said pressing means at an optimum force at which said maximum pulse has been detected by said pulse wave sensor while said pressing force is continuously varied, so that said pulse wave sensor is pressed against said arterial vessel with said optimum force and thereby continuously detects optimum pulses of said pulse wave each of which has substantially the same amplitude as the maximum amplitude of said maximum pulse; determining a relationship between blood pressure and pulse wave magnitude, based on the determined actual blood pressure and the magnitude of at least one pulse of said maximum pulse and said optimum pulses; and determining blood pressures of the subject continuously according to the thus determined relationship between blood pressure and pulse wave magnitude, based on the magnitudes of said optimum pulses. - View Dependent Claims (5, 6, 7, 8, 9)
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10. An apparatus for measuring a blood pressure of a subject, comprising:
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a pulse wave sensor for detecting a pulse wave produced from an arterial vessel of the subject; pressing means for providing a pressing force for pressing said pulse wave sensor against said arterial vessel via a body surface of the subject; said pulse wave sensor detecting variation in the magnitude of said pulse wave while the pressing force of said pressing means is continuously varied; means for detecting the magnitude of the pressing force of said pressing means; and means for determining an actual blood pressure of the subject according to predetermined relationship between blood pressure and the pressing force of said pressing means, based on the detected magnitude variation of the pulse wave and the detected magnitude of said pressing force.
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11. An apparatus for measuring blood pressures of a subject, comprising:
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a pulse wave sensor for continuously detecting a pulse wave produced from an arterial vessel of the subject, said pulse wave consisting of a plurality of pulses; pressing means for providing a pressing force for pressing said pulse wave sensor against said arterial vessel via a body surface of the subject, said pressing means providing a continuously variable pressing force; said pulse wave sensor detecting variation in the magnitudes of the pulses of said pulse wave while the pressing force of said pressing means is continuously varied; means for detecting the magnitude of the pressing force of said pressing means; first means for determining an actual blood pressure of the subject according to a predetermined relationship between blood pressure and the pressing force of said pressing means, based on the detected magnitude variation of the pulses of the pulse wave and the detected magnitude of the pressing force of said pressing force; second means for selecting, from the detected pulses of the pulse wave, a maximum pulse having a maximum amplitude; third means for maintaining the pressing force of said pressing means at an optimum force at which said maximum pulse has been detected by said pulse wave sensor while said pressing force is continuously varied, so that said pulse wave sensor is pressed against said arterial vessel with said optimum force and thereby continuously detects optimum pulses of said pulse wave each of which has substantially the same amplitude as the maximum amplitude of said maximum pulse; fourth means for determining a relationship between blood pressure and pulse wave magnitude, based on the determined actual blood pressure and the magnitude of at least one pulse of said maximum pule and said optimum pulses; and fifth means for continuously determining blood pressures of the subject according to the determined relationship between blood pressure and pulse wave magnitude, based on the magnitudes of said optimum pulses. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification