×

Device and method for measuring the elasticity of an artery by ultrasonic echography

  • US 5,411,028 A
  • Filed: 12/21/1993
  • Issued: 05/02/1995
  • Est. Priority Date: 12/22/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A device for measuring physiological parameters of an artery containing flowing blood having an instantaneous pressure P(t), said device comprising, in an ultrasonic echograph used in profilometer mode (M mode) and provided with transmission/receiving means including a device for forming channels in a receiving mode, a first assembly for measuring and forming at outputs of the first assembly a first set of signals representing an instantaneous blood flow rate Q(t) within the artery, an instantaneous radius variation Δ

  • r(t) of the artery, and a mean radius r0 of the artery along a first excitation line A, characterized in that it also comprises, for the determination of elasticity γ

    (t) of said artery and the pressure P(t) of the flowing blood within the artery, a second assembly for measuring, by ultrasonic echography, and forming at its outputs a second set of signals representing an instantaneous blood flow rate Q'"'"'(t) and an instantaneous radius variation Δ

    r'"'"'(t) along a second excitation line B neighbouring the first excitation line A, the second excitation line B being situated at a distance e from the first excitation line A, which distance is small in comparison with the systolic propogation wavelength λ

    along the artery, the two excitation lines A and B traversing the artery according to one of its meridian planes, the distance e being taken in the direction of the axis of the artery, first and second storage means connected to the respective outputs of said first and second assemblies for storing digital samples of said respective first and second sets of signals and calculation means coupled to said first and second storage means for operating on said stored digital samples to calculate physiological parameters of said artery.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×