Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1979-11-13
1982-02-23
Michell, Robert W.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
128663, G01F 100
Patent
active
043163912
ABSTRACT:
A method is presented for measuring fluid flow rate in a system having a conduit through which the fluid flows. The method is particularly useful for measuring blood flow rate in a cardiovascular system. A substance which provides a plurality of microbubbles is added to the fluid flow system upstream of the measurement position in the conduit. An ultrasonic pulse is generated from a position opposite and spaced from the conduit as the microbubbles pass therethrough. A reflected ultrasonic image, created by reflection of the pulse from at least the wall of the conduit which is distal from said position, is measured. The fluid flow rate within the conduit is determined from these ultrasonic images using dye dilution techniques. In a living being, the pulse is preferably generated adjacent the rib cage or in the esophagus and the conduit is preferably the heart or the pulmonary artery, whereby, the blood flow rate determined is equal to the volumetric cardiac output rate.
REFERENCES:
patent: 3640271 (1972-02-01), Horton
patent: 3921622 (1975-11-01), Cole
patent: 4122713 (1978-10-01), Stasz et al.
Tickner, E. G. et al., "Non-Invasive Assessment of Pulmonary Hypertension Using the Bubble UTS Resonance Pressure (BURP) Method", NHLB Tech. Rept. HR-62917-1A, Apr. 1977.
Feigenbaum, H., "Echocardiography", Chapter 2, pp. 5-54, 2nd Edition, Lea & Febiger Publ., Phila., Pa.
Jaworski Francis J.
Michell Robert W.
Ultra Med, Inc.
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