Surgery – Truss – Pad
Patent
1988-05-02
1992-03-31
Cohen, Lee S.
Surgery
Truss
Pad
128681, A61B 502
Patent
active
050998536
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a blood pressure monitoring system for continuously monitoring blood pressures which are determined based on the pulse waves produced by pressing a portion of a living body.
BACKGROUND OF THE INVENTION
It is a widely-employed method for measuring blood pressure of a living body to press a portion of the living body by a cuff, etc. to detect pressure oscillation waves (pulse waves) produced in synchronization with heartbeats of the living body and determine values of blood pressure of the living body based on a change in magnitude of the detected pressure oscillation waves.
However, the above-indicated blood pressure measuring method is not recommendable for application to such a living body, for example a patient after a surgical operation, whose blood pressure must be continuously monitored during a comparatively long period of time, because a portion of the living body is successively pressed during the period, thereby giving appreciable discomfort to the living body.
DISCLOSURE OF THE INVENTION
The present invention has been developed in the background indicated above, and the gist thereof resides in providing a blood pressure monitoring system of a type for continuously displaying blood pressure of a living body on a display to monitor the blood pressure of the living body, the system including (a) pulse wave detecting means for detecting pulse waves of an arterial vessel of the living body; (b) blood pressure measuring means for measuring an actual blood pressure of the living body; and (c) control means for determining a relationship between the pulse waves detected by the pulse wave detecting means and the actual blood pressure measured by the blood pressure measuring means, determining blood pressures according to the thus-determined relationship and based on the pulse waves, and commanding the display to successively display the thus-determined blood pressures thereon.
As shown in the view of FIG. 1 corresponding to claim, at the time the blood pressure measuring means measures an actual blood pressure, the control means determines a relationship between the measured actual blood pressure and the pulse waves of an arterial vessel which are continuously detected by the pulse wave detecting means, and a change in blood pressure is continuously displayed on the display according to the thus-determined relationship and based on the pulse waves.
Therefore, in the present invention, it is unnecessary to successively obtain measurements of the actual blood pressure of the living body to monitor his or her blood pressure, and a long-time continuous monitoring of the blood pressure may be conducted without successively pressing a portion of the living body. Thus, the living body being monitored is prevented from any obstruction of blood circulation and is not subjected to appreciable discomfort.
Since the pulse wave detecting means of the present invention is adapted to detect pulse waves of an arterial vessel, the pulse waves detected are almost free from influence of breathing of the living body. Therefore, accurate monitoring of blood pressure is conducted. Although it is possible to use a cuff wound around an arm of a living body as pulse wave detecting means to detect pressure oscillations of the cuff as pulse waves, the pulse waves detected represent variation in volume of arteries and veins, and the variation in volume is liable to be influenced by breathing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view corresponding to claim of the present invention.
FIG. 2 is a diagrammatic view illustrating the arrangement of one embodiment of the present invention.
FIG. 3 is a view showing an example of a blood pressure trend displayed on a display of the embodiment of FIG. 2.
FIG. 4 is a view showing a pulse wave sensor of FIG. 2 when it is in pressed contact with a portion of a living body.
FIG. 5 is a view showing a flow chart used for the operation of the embodiment of FIG. 2.
FIG. 6 is a view showing an example of pulse waves which are
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patent: 4669485 (1987-06-01), Russell
patent: 4699152 (1987-10-01), Link
patent: 4799491 (1989-01-01), Eckerle
"Idea to measure diastolic arterial pressure by volume oscillometric method in human fingers", Medical and Biological Engineering and Computing, vol. 24, No. 5, Sep. 1986, PP. 549-554.
"Analysis for the non--invasive determination of arterial properties and for the transoutaneous continuous monitoring of arterial blood pressure", Medical and Biological Engineering and Computing, vol. 16, No. 6, Nov. 1978, pp. 715-726.
Tsuda Hideichi
Uemura Masahiro
Yokoe Hifumi
Cohen Lee S.
Colin Electronics Co., Ltd.
Lacyk John P.
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