| 摘要 |
The method for establishing blood pressure in an artery uses the measurement results of two non-invasive sensors 5, 6 for the diameter of the artery, carried out at two close locations 3, 4 separated by a distance DELTA x. The method provides for measuring the time difference DELTA t 7 existing between each pair of diameter measurements, and for establishing the value of the speed of propagation of the pressure wave 9. This value is then compared with an expression 11 of the form c(D) = c(D, alpha , beta , gamma ..) taking into account the physical behaviour of the artery. This comparison makes it possible, after adjustment 12 using a mathematical minimum deviation method, to calculate the parameters alpha , beta , gamma ... of the relationship given herein above. By replacing the parameters alpha , beta , gamma ... with their values in a relationship 10 D(p)D(p, alpha , beta , gamma ...), and by using the measurement results of a diameter sensor, it is possible to deduce the value of the blood pressure p(t) at each instant of the cardiac cycle. The value of the blood pressure makes it possible, with the corresponding value of the diameter of the artery, to plot a pressure/diameter curve 14, using which the mechanical properties of the artery can be measured. <IMAGE> |
