Surgery – Truss – Pad
Patent
1994-04-25
1996-10-15
Sykes, Angela D.
Surgery
Truss
Pad
128681, A61B 50225
Patent
active
055644260
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is related to a blood pressure measuring system utilizing an oscillometric method, which is characterized by extracting an arterial pulse component superimposed on a cuff pressure of each arterial pulse, and deriving particular times indicative of systolic and diastolic blood pressures in accordance with a variation of the arterial pulse component.
BACKGROUND ART
In the past, there has been known a blood pressure measuring system (Japanese Patent publication [KOKOKU] No. 3-11219) utilizing an oscillometric method, which is characterized by extracting an arterial pulse component superimposed on a cuff pressure of each arterial pulse, and deriving particular times indicative of systolic and diastolic blood pressures in accordance with a variation of the arterial pulse component. In the blood pressure measuring system, the arterial pulse component is defined as a pulse height of the arterial pulse.
By the way, since the pulse height of each arterial pulse is varied in response to a bloodstream of a selected portion of a subject to which an occluding cuff is attached, an extent of the variation is influenced by individual difference. In particular, when the variation of the pulse height is small at a particular time indicative of the systolic or diastolic blood pressure of the subject, it is difficult to accurately derive the systolic or diastolic blood pressure from the pulse height. Therefore, there is a probability of causing an error of measurement.
A primary object of the present invention is to provide a blood pressure measuring system capable of accurately determining systolic and diastolic blood pressures of a subject while preventing the occurrence of an error of measurement.
DISCLOSURE OF INVENTION
A blood pressure measuring system of the present invention comprises an occluding cuff adapted in use to be attached to a selected portion of a subject, a pressurizing device for providing an occluding pressure of the occluding cuff, a pressure bleeding device for gradually decreasing the occluding pressure, a pressure sensor, a pressure data separating device, a blood pressure determining device and a display. The pressure sensor is for sensing an instantaneous cuff pressure and providing an electrical signal indicative thereof. The pressure data separating device is for separating from the electrical signal an arterial pulse component superimposed on a net cuff pressure during a pressure bleeding period of gradually decreasing the occluding pressure so as to separately extract the net cuff pressure and the arterial pulse component. The blood pressure determining device is for determining systolic and diastolic blood pressures in accordance with the net cuff pressure and the arterial pulse component provided from the pressure data separating device. In particular, the pressure data separating device includes a waveform analyzing section for computing a waveform value indicative of a waveform of each arterial pulse. In addition, the blood pressure determining device includes a characteristic value detecting section for detecting a characteristic value from a time series of the waveform values and a blood pressure deriving section for deriving the systolic and diastolic blood pressures in accordance with the net cuff pressure corresponding to the characteristic value. Therefore, the blood pressure measuring system of the present invention is capable of computing the waveform value indicative of the waveform of each arterial pulse, detecting the characteristic value from the time series of the waveform values, and deriving the systolic and diastolic blood pressures in accordance with the net cuff pressure corresponding to the characteristic value. That is, particular times indicative of the systolic and diastolic blood pressures are derived in accordance with a variation of the waveform of the arterial pulse, so that an accurate measurement of the systolic and diastolic blood pressures can be performed while preventing an error of measurement caused by individual
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patent: 4484584 (1984-11-01), Uemura
patent: 4751930 (1988-06-01), Terada
patent: 4860760 (1989-08-01), Miyawaki et al.
patent: 5054494 (1991-10-01), Lazzaro et al.
patent: 5099853 (1992-03-01), Uemura et al.
Matsushita Electric & Works Ltd.
Sykes Angela D.
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