| 摘要 |
This method for establishing blood pressure in an artery employs the measurement results from two non-invasive sensors (5, 6) of artery diameter at two closely spaced locations (3, 4) separated by a distance DELTA x. The method provides for measuring the time spread DELTA t(7) between each pair of diameter measurements and establishing the propagation velocity of the pressure wave (9). Next, this value is compared with an expression (11) of the form c(D)= c(D, alpha , beta , gamma , . . . ) which takes into account the physical behavior of the artery. This comparison permits one, following adjustment (12) based on a mathematical procedure for minimizing spreads, to calculate the parameters alpha , +62, gamma , . . . of the relation given hereinabove. By replacing the parameters alpha , beta , gamma , . . . by their values in a relation (10) D(p)= D(p, alpha , +62, gamma , . . . ) and in employing the measurement results from a diameter sensor, one may deduce the blood pressure value p(t) at each instant of the cardiac cycle. The blood pressure value together with the corresponding value of the artery diameter permit tracing a pressure-diameter curve (14) by means of which the mechanical properties of the artery may be measured. |
