Surgery – Truss – Pad
Patent
1985-10-02
1987-09-15
Howell, Kyle L.
Surgery
Truss
Pad
7386125, 7386127, A61B 1000
Patent
active
046933190
ABSTRACT:
A correlation detection type ultrasound blood flowmeter for measuring speed of flowing blood which is passing across two sample volumes which are respectively positioned at the same distance to each other from the blood flowmeter on two sound-beams formed by the blood flowmeter. The speed of flowing blood is measured by cross correlation time-difference detection, and the detection is performed by using sample and hold voltages obtained from echo signals reflected from the flowing blood which is passing across the two sample volumes. To the blood flowmeter, two quadrature detection circuits are applied for selecting echo signals reflected by the flowing blood from echo signals reflected by whole substances located along the two sound-beams by eliminating echo signals reflected by fixed substances located along the two sound-beams, and two range gate circuits are applied to each quadrature detection circuit for extending a range of each sound volume for measuring the speed of the flowing blood which passes across the two sample volumes not only perpendicularly but also aslant to a center line made by the directions of the two sound-beams.
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Winter, D. C. et al, "Ultrasonic Detection of Cardiovascular Flow Disturbances", ISA Transactions, vol. 15, No. 3, pp. 237-241, 1976.
Fujitsu Limited
Howell Kyle L.
Jaworski Francis J.
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