A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
349/39, 128/127.
A61B 17/34 (2006.01) A61B 8/06 (2006.01) A61B 8/12 (2006.01) G01F 1/66 (2006.01)
Patent
CA 1241580
VOLUMETRIC FLOW RATE DETERMINATION IN CONDUITS NOT DIRECTLY ACCESSIBLE Abstract A catheter, particularly adapted for cardiac output determination, comprises an elongated tube of flexible material, the tube having a substantially rigid distal portion on which is disposed an ultrasonic transducer and a proxi- mate; inflatable balloon. The ultrasonic transducer is arranged so as to direct a beam of ultrasound toward a transverse plane that bisects the balloon, and is connected by appropriate leads to a conventional Doppler circuit. With the balloon deflated, the signal from the Doppler circuit is sensed to measure bloodvelocity. Thereafter, the balloon is inflated so that it has a predetermined cross-sectional area in the transverse plane. The signal from the Doppler circuit is again sensed to measure blood velocity. Using a simple mathematical relationship, the effective internal cross-sectional area of the blood vessel isdetermined from the two measured velocities and from the predetermined cross- sectional area of the balloon when inflated. The volumetric flow rate is then determined by multiplying the first measured velocity by the effective internal cross-sectional area.
492565
Johnston G. Gilbert
Smart & Biggar
LandOfFree
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