Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1981-02-27
1983-07-05
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
73227, 128663, A61B 510, G01F 166
Patent
active
043911480
ABSTRACT:
The invention is particularly related to the measurement of the area of a blood vessel and the volume flow rate of blood in such vessels. An ultrasonic Doppler velocimeter which derives a number of velocity signals dependent on the number of different velocities in a duct is coupled by way of a limiter to a frequency-to-voltage converter which therefore has an output with one component for each velocity signal. A further frequency-to-voltage converter provides a signal dependent on the number of velocity signals and since this number depends on the duct area, the output from the further converter is a measure of this area. By using another frequency-to-voltage converter and a mean detector, a mean velocity signal is obtained which when multiplied by the area signal generates volume flow rate.
REFERENCES:
patent: 3554030 (1971-01-01), Peronneau
patent: 3675192 (1972-07-01), Fahrbach
patent: 4095597 (1978-06-01), Hassler
patent: 4103679 (1978-08-01), Aronson
NASA Progress Report, NRG 33010074, Cornell University, 1969, "Directional Doppler Flowmeter", McLeod, R. D.
"Ultrasound in Medicine and Biology", 2, 1, Accuracy and Limitations of the Ultrasonic Doppler Blood Velocimeter and Zero Crossing Detector, by Lunt, M. J., 1975.
"Ultrasonic Doppler Velocimetry", Chapter 7, by Roberts and Sainz, of the Book Non-Invasive Physiological Measurements, Edited by Rolfe, Academic Press, 1979, p. 164, Paragraph 3.5.
"Phase Locked Loop Techniques Applied to Ultrasonic Doppler System Processing", Sainz et al., Ultrasonics 14, pp. 128 to 132, May 1976.
"Vessel Area Detection with C. W. Ultrasound", Sainz and Roberts, Medical and Biological Engineering, Mar. 1976, pp. 245 and 246.
Chapter 27, "Initial Evaluation of Transcutaneous Aortovelography-A New Non-Invasive Technique for Haemodynamic Measurements in the Major Thoracic Vessels", by Light, pp. 325 to 360 of the Book Cardiovasculaor Applications of Ultrasound, Edited by Reneman, R. S., North Holland Publishing Co.
Roberts Victor C.
Sainz Antonio J.
National Research Development Corporation
Ruehl Charles A.
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