Patent ID: 9510760
Filing Date: 2016-12-06
CPC Classification: A61B

Claim Text:
1. A novel sphygmomanometer for directly estimating central aortic pulse pressure by a pressure pulse wave oscillation signal of a cuff, comprising: (a) a control means for controlling a pressure of the cuff, which is used to control the proceeding of pressurization, maintenance and decompression in a measured location of the cuff; (b) at least one recording and storing means for recording and storing the pressure pulse wave oscillation signal of the cuff comprising a waveform of the pressure pulse wave oscillation signal of the cuff; and (c) a processing means for analyzing the recorded and stored waveform of the pressure pulse wave oscillation signal of the cuff to obtain values of a plurality of predicting variables, and calculating the central aortic pulse pressure in real time by substituting the values of the plurality of predicting variables into the following equation: wherein A. the equation is stored in the at least one storing means, end-systolic pressure (ESP), area under a pressure tracing in systole (As), area under a pressure tracing in diastole (Ad), diastolic blood pressure (DBP) and heart rate (HR) are the plurality of predicting variables, and a is a constant and b, c, d, e and f are variable coefficients, and B. the equation is obtained by the following steps: (ii) averaging the waveforms of the measured pressure pulse wave oscillation signals and calibrating an averaged waveform by using the systolic blood pressures and the diastolic blood pressures; (iii) analyzing the calibrated waveform of the pressure pulse wave oscillation signals to obtain a plurality of characteristic signal values serving as the plurality of predicting variables; and (iv) obtaining the constant a and the variable coefficients b, c, d, e, and f by linear regression analysis.