Blood pressure measuring apparatus
First Claim
1. An apparatus for automatically measuring a blood pressure of a living subject, comprising:
- an inflatable cuff adapted to be wound around a body portion of the subject, said cuff being inflated to provide a cuff pressure to press said body portion;
a pressure sensor which detects said cuff pressure;
a pressure changing device which changes said cuff pressure;
a blood pressure measuring device which measures a blood pressure value of the subject by reading said cuff pressure detected by said pressure sensor while the cuff pressure is decreased at a prescribed rate by said pressure changing device;
a waveform detector which detects a waveform of a pulse wave produced in said cuff during the decreasing of said cuff pressure, said waveform of said pulse wave being changeable with said cuff pressure;
determining means for determining a relationship between (A) evaluated values of a waveform of a pulse wave, (B) pressure values of said cuff, and (C) blood pressure values of the subject, based on (a) an evaluated value of said waveform of said pulse wave detected by said waveform detector, (b) a pressure value of said cuff at a time of detection of said waveform by said waveform detector, and (c) said blood pressure value of the subject measured by said blood pressure measuring device, said relationship being proper to the subject;
estimating means for estimating, according to the determined relationship, a blood pressure values of the subject based on (a′
) an evaluated value of a waveform of a pulse wave detected by said waveform detector while said cuff pressure is increased before the cuff pressure is decreased at said prescribed rate in measuring an actual blood pressure subject and (b′
) a pressure value of said cuff at a time of detection of said waveform during the increasing of said cuff pressure;
evaluating means for evaluating a plurality of characteristic values of said waveform of said pulse wave detected by said waveform detector during said decreasing of said cuff pressure, and providing an evaluated value of each of the waveform characteristics; and
wherein said determining means determines a plurality of relationships each based on the evaluated value of a corresponding one of said waveform characteristics and said estimating means calculates a plurality of blood pressure values of the subject according to the determined relationships, respectively, and estimates said blood pressure value of the subject based on the calculated blood pressure values.
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Abstract
An apparatus for measuring a blood pressure of a living subject, including a blood pressure measuring device which measures a blood pressure value of the subject, a first memory which stores a plurality of blood pressure values measured by the blood pressure measuring device, in an order of measurement of the blood pressure values, a pulse wave detecting device which detects a pulse wave produced from an arterial vessel of the subject in synchronism with heartbeat of the subject while each of the blood pressure values is measured by the blood pressure measuring device, a second memory which stores a waveform of the pulse wave detected by the pulse wave detecting device, in the order, the second memory storing the respective waveforms of the pulse waves each of which is detected by the pulse wave detecting device while a corresponding one of the blood pressure values is measured by the blood pressure measuring device, and an output device which outputs the blood pressure values stored in the first memory, in the order, and a plurality of curves respectively representing the waveforms stored in the second memory, in the order, in a side-by-side relation with each other.
50 Citations
6 Claims
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1. An apparatus for automatically measuring a blood pressure of a living subject, comprising:
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an inflatable cuff adapted to be wound around a body portion of the subject, said cuff being inflated to provide a cuff pressure to press said body portion;
a pressure sensor which detects said cuff pressure;
a pressure changing device which changes said cuff pressure;
a blood pressure measuring device which measures a blood pressure value of the subject by reading said cuff pressure detected by said pressure sensor while the cuff pressure is decreased at a prescribed rate by said pressure changing device;
a waveform detector which detects a waveform of a pulse wave produced in said cuff during the decreasing of said cuff pressure, said waveform of said pulse wave being changeable with said cuff pressure;
determining means for determining a relationship between (A) evaluated values of a waveform of a pulse wave, (B) pressure values of said cuff, and (C) blood pressure values of the subject, based on (a) an evaluated value of said waveform of said pulse wave detected by said waveform detector, (b) a pressure value of said cuff at a time of detection of said waveform by said waveform detector, and (c) said blood pressure value of the subject measured by said blood pressure measuring device, said relationship being proper to the subject;
estimating means for estimating, according to the determined relationship, a blood pressure values of the subject based on (a′
) an evaluated value of a waveform of a pulse wave detected by said waveform detector while said cuff pressure is increased before the cuff pressure is decreased at said prescribed rate in measuring an actual blood pressure subject and (b′
) a pressure value of said cuff at a time of detection of said waveform during the increasing of said cuff pressure;
evaluating means for evaluating a plurality of characteristic values of said waveform of said pulse wave detected by said waveform detector during said decreasing of said cuff pressure, and providing an evaluated value of each of the waveform characteristics; and
wherein said determining means determines a plurality of relationships each based on the evaluated value of a corresponding one of said waveform characteristics and said estimating means calculates a plurality of blood pressure values of the subject according to the determined relationships, respectively, and estimates said blood pressure value of the subject based on the calculated blood pressure values. - View Dependent Claims (2, 3)
abnormality identifying means for identifying a blood pressure abnormality of the subject by comparing the estimated blood pressure value of the subject with a reference value; and
an output device which outputs, when said blood pressure abnormality of the subject is identified, information indicative of the identification of the blood pressure abnormality of the subject.
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4. An apparatus for automatically measuring a blood pressure of a living subject, comprising:
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an inflatable cuff adapted to be wound around a body portion of the subject, said cuff being inflated to provide a cuff pressure to press said body portion;
a pressure sensor which detects said cuff pressure;
a pressure changing device which changes said cuff pressure;
a blood pressure measuring device which measures a blood pressure value of the subject by reading said cuff pressure detected by said pressure sensor while the cuff pressure is decreased at a prescribed rate by said pressure changing device;
a waveform detector which detects a waveform of a pulse wave produced in said cuff during the decreasing of said cuff pressure, said waveform of said pulse wave being changeable with said cuff pressure;
a memory which stores a pulse amplitude of said pulse wave detected by said waveform detector, and a pressure value of said cuff at a time of detection of said pulse amplitude;
determining means for determining an envelope representing a relationship between (a) a plurality of pulse amplitudes detected by said waveform detector while said cuff pressure is increased before the cuff pressure is decreased at said prescribed rate and (b) a plurality of pressure values of said cuff at respective times of detection of said pulse amplitudes; and
estimating means for estimating a blood pressure value of the subject, based on the determined envelope, according to a prescribed relationship. - View Dependent Claims (5, 6)
abnormality identifying means for identifying a blood pressure abnormality of the subject by comparing the estimated blood pressure value of the subject with a reference value; and
an output device which outputs, when said blood pressure abnormality of the subject is identified, information indicative of the identification of the blood pressure abnormality of the subject.
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Specification