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Abstract

A blood pressure monitor which automatically and noninvasively measures a patient's systolic, diastolic, and mean arterial blood pressure. Measurements are based on the oscillometric principle. Cuff pressure oscillations are monitored as cuff pressure decreases from a value higher than systolic pressure, down to a value below diastolic pressure. The oscillometric method is the most widely used clinical method of automated noninvasive blood pressure monitoring. The apparatus utilizes a conventional pressure cuff placed about an extremity of the body of the subject and the pressure of air in the cuff is measured at a very low frequency steady pressure, which is called 'cuff pressure'. A second measurement, which is the oscillation signal after passing through a band pass filter, gives the oscillations in the wall of the artery about which the cuff is placed. The method utilizes an inflatable occlusive cuff which controls the pressure placed on the artery. The signal information that is diagnostically used is the oscillation period and oscillation amplitude as the cuff pressure is reduced monatonically from a value above the systolic pressure to a value below the diastolic pressure. From this data the subject's blood pressure and heart rate values can be determined.

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First Claim