Surgery – Diagnostic testing – Cardiovascular
Patent
1996-09-10
1998-04-28
Kamm, William E.
Surgery
Diagnostic testing
Cardiovascular
600492, 600494, A61B 500
Patent
active
057438579
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to a blood pressure monitor apparatus which monitors blood pressure values of a living subject for a considerably long time.
BACKGROUND OF THE INVENTION
Generally, a blood pressure monitor apparatus which monitors blood pressure values of a living subject for a considerably long time includes a cuff being worn on a portion of the subject and a blood pressure measuring device for measuring a blood pressure value of the subject by changing a pressure of the cuff. The blood pressure value measured by the blood pressure measuring device using the cuff enjoys high reliability. As one type of the above-mentioned blood pressure monitor apparatus, there is known an apparatus which starts a blood pressure measurement of a blood pressure measuring device and outputs the measured blood pressure values of a living subject at a predetermined period.
However, in the above blood pressure monitor apparatus, if the interval between successive blood pressure measurements is shortened for improving the accuracy of blood pressure monitoring, the frequency of pressing of the cuff is increased and the subject feels more discomfort. In the case where the frequency of pressing of the cuff is excessively high, congestion occurs to the body portion on which the cuff is worn, and accurate blood pressure values are not obtained.
Further, there has been proposed a monitor blood pressure apparatus including a blood pressure measuring device for measuring a blood pressure value of a living subject based on variation of a pulse-synchronous wave obtained by changing a pressure of a cuff being worn on the living subject, a pressure pulse wave sensor adapted to be pressed on an artery of the subject for detecting a pressure pulse wave produced from the artery of the subject, a pressure pulse wave-blood pressure relationship determining means for determining, at a predetermined period, a pressure pulse wave-blood pressure relationship between magnitude of pressure pulse wave and blood pressure based on the pressure pulse wave detected by the pulse wave sensor and the blood pressure measured by the blood pressure measuring device, by starting the blood pressure measuring device at the predetermined period, and a monitor blood pressure determining means for successively determining a monitor blood pressure value based on an actual pressure pulse wave detected by the pressure pulse wave sensor, according to the pressure pulse wave-blood pressure relationship. An example of the blood pressure monitor apparatus is disclosed in Laid-Open publication No. 5-3858 of Unexamined Japanese patent application. The blood pressure monitor apparatus is capable of detetermining a monitor blood pressure value for each heartbeat-synchronous pulse of a pulse wave.
However, since the blood pressure measurement using the cuff is carried out at the predetermined period to determine a pressure pulse wave-blood pressure relationship for maintaining the accuracy of monitor blood pressure values, the living subject feels discomfort due to the pressure of the cuff although the pressure pulse wave-blood pressure relationship may be effective.
The present invention has been developed in the background of the above-described situation. It is therefore an object of the present invention to provide a blood pressure monitor apparatus which monitors blood pressure values of a living subject, without having the subject feel discomfort.
The inventors of the present invention have found that there exists a phase difference between respective pulse waves detected by pulse wave sensors being worn on different portions of a living subject, and that the phase difference mainly depends on the distances between the heart of the subject and the pulse wave sensors. They have also found that the phase difference changes depending on the blood pressure of the subject. The present invention has been developed based on those findings. Thus, unnecessary blood pressure measurements using the cuff are avoided when it is judged, based on the pha
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Inukai Hidekatsu
Sakai Hiroshi
Shinoda Masayuki
Colin Corporation
Evanisko George R.
Kamm William E.
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