Heat exchanger apparatus and method for regulating the...

F - Mech Eng,Light,Heat,Weapons – 28 – F

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F28F 1/06 (2006.01) A61M 1/32 (2006.01) A61M 5/44 (2006.01) F28D 7/02 (2006.01)

Patent

CA 1086714

HEAT EXCHANGER APPARATUS AND METHOD FOR REGULATING THE TEMPERATURE OF BLOOD IN AN EXTRACORPOREAL CIRCUIT ABSTRACT OF THE DISCLOSURE A heat exchanger wherein heat transfer fluid flows through a tube having an integral, substantially continuous hollow helical rib along its length providing a substantially continuous helical flute. The tube is positioned within a chamber connected in an extracorporeal blood circuit such that the blood is caused to flow over the exterior surface of the helically ribbed tube. In the preferred embodiment, the blood flows through a plurality of continuous, restricted area flow paths offering substantially uniform flow impedance to the blood, these restricted flow paths being provided by forming the helically ribbed tube in a helical configuration mounted between an inner cylindrical column and an outer cylindrical shell such that the blood is caused to flow through the plural paths of restricted cross-sectional area provided by the helical flute. In one embodiment, the heat exchanger tube and blood chamber are formed as an independent unit adapted for use in the desired location of an extracorporeal blood circuit. In the other embodiments, the heat exchanger is formed integral with a blood oxygenator in which oxygen is absorbed into the blood and carbon dioxide is released therefrom.

276912

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