DEVICE AND PROCESS TO MEASURE, BY DOPPLER EFFECT, THE EVOLUTION OF A VEIN'S DIAMETER

摘要

the invention concerns a device for measuring a doppler effect.the development of thethe diameter of the vein.according to the invention, the device is operated in such a way..cndot. during the generation of a first signal, in order.emissionand (3) received in continuous mode, so as to achieve the function ofposition of the probe for transmission and reception in the vein.audible signal on a speaker adapted to locate the vein..cndot. in the generation of a second signal just after thelocationthe vein, to order the probe for transmission and reception mode (3)discontinuous and to determine, on the basis of the variation of frequency between thethe ultrasonic waves transmitted and received, the diameter of the vein to maintainthe display of the trend