초록 ▼

A noninvasive blood pressure measuring system includes an inflatable cuff for encircling a portion of the human body. The cuff is inflated to a pressure sufficient to occlude arterial flow, and the pressure is then released by opening of a pressure relief valve for short periods of time to reduce th

A noninvasive blood pressure measuring system includes an inflatable cuff for encircling a portion of the human body. The cuff is inflated to a pressure sufficient to occlude arterial flow, and the pressure is then released by opening of a pressure relief valve for short periods of time to reduce the pressure until both the systolic and diastolic events have occurred. The incremental decrease in pressure with each opening of the pressure relief valve is controlled by monitoring the pressure before opening and after closing the pressure relief valve. The time duration of the next valve opening cycle is controlled as a function of the comparison of the two pressures so as to maintain an average incremental decrease in pressure. In addition to systolic and diastolic blood pressures, pulse rate is also determined by counting the number of pulses between the systolic and diastolic events and determining the time elapsed between the two events. After occurrence of the systolic event, the valve is opened between pulses and the microphone and signal processing circuitry are disabled during the valve opening to prevent valve noise from creating false pulse signals.

대표청구항 ▼

A noninvasive blood pressure measuring apparatus comprising: an inflatable cuff for encircling a portion of the human body; means for inflating the inflatable cuff to a pressure sufficient to occlude arterial flow; pressure relief valve means for deflating the cuff; pressure sensor means for sensing

A noninvasive blood pressure measuring apparatus comprising: an inflatable cuff for encircling a portion of the human body; means for inflating the inflatable cuff to a pressure sufficient to occlude arterial flow; pressure relief valve means for deflating the cuff; pressure sensor means for sensing the pressure within the cuff and providing digital pressure values as a function of the sensed pressure within the cuff; and means for controlling the time duration of each opening of the pressure relief valve means as a function of the sensed pressure before a previous opening of the pressure reflief valve means and the sensed pressure after the previous opening of the pressure relif valve means, wherein the means for controlling the time duration comprises digital computer means for computing a time duration of each opening of the pressure relief valve means as a function of the digital pressure values before and after a previous opening of the pressure relief valve means.