Heat exchange catheter with multi-lumen tube having a fluid...

A - Human Necessities – 61 – F

Patent

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Details

A61F 7/12 (2006.01) A61M 25/14 (2006.01) A61B 18/02 (2006.01)

Patent

CA 2649885

The catheter includes a multi-lumen tube having an outflow portion and an accessory portion. The accessory portion is integrally formed within an interior volume of the outflow portion. The accessory portion has a cross-section smaller than the outflow portion. The outflow portion is offset from the accessory portion such that they are integrally joined. The space between these portions defines a fluid return passageway and the space within the accessory portion defines an accessory passageway. A flexible outer sleeve cooperates with the multi-lumen tube to form a fluid inlet passageway. During operation, an inlet flow of warming fluid flows through the fluid inlet passageway formed between the outer sleeve and the multi-lumen tube. The flow continues around a distal end of the outflow portion of the multi-lumen tube, thus becoming an outlet flow of the warming fluid which is directed through the fluid return passageway.

Le cathéter selon la présente invention comprend un tube à plusieurs lumières comportant une partie flux de sortie et une partie accessoire. La partie accessoire est formée d'une seule pièce avec un volume intérieur de la partie flux de sortie. La partie accessoire présente une section inférieure à la partie flux de sortie. La partie flux de sortie est décalée de la partie accessoire de sorte qu'elles soient entièrement reliées. L'espace entre ces parties définit un passage de retour de fluide et l'espace dans la partie accessoire définit un passage accessoire. Une gaine extérieure souple coopère avec le tube à plusieurs lumières pour former un passage d'entrée de fluide. En fonctionnement, un flux d'entrée de fluide chauffant s'écoule dans le passage d'entrée de fluide formé entre la gaine extérieure et le tube à plusieurs lumières. L'écoulement se poursuit autour d'une extrémité distale de la partie flux de sortie du tube à plusieurs lumières, et devient ainsi un flux de sortie du fluide chauffant qui est dirigé dans le passage de retour de fluide.

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