Blood oxygenator with heat exchanger

A - Human Necessities – 61 – M

Patent

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Details

A61M 1/14 (2006.01) A61M 1/16 (2006.01) F28F 21/06 (2006.01)

Patent

CA 2241366

A generally cylindrical membrane-type fiber bundle blood oxygenator (10) concentrically surrounds a generally cylindrical blood heat exchanger. Heat transfer fluid flows downwardly from the upper end of the heat exchanger around outside surfaces of the fiber bundle (26). A blood inlet manifold (18) at the lower end of the heat exchanger includes an inlet nozzle (30) and a generally conical wall (60). A transition manifold (24) at the upper end of the heat exchanger directs blood to the upper end of the oxygenator fiber bundle (28). The transition manifold (24) includes a generally conical wall (96) defining a surface which spreads the blood substantially uniformly around the upper portion of the fiber bundle (28). The blood flows downwardly around outside surfaces of the fiber bundle (28) to a blood outlet manifold that collects the oxygenated blood. The blood outlet manifold comprises an annular blood collection chamber (110). A blood outlet nozzle (32) extends from the annular blood collection chamber (110).

La présente invention concerne un oxygénateur (10) de sang constitué d'un faisceau de fibres membraneuses et de forme générale cylindrique qui entoure un échangeur thermique de sang. Le liquide caloporteur coule de haut en bas de la partie supérieure de l'échangeur thermique le long des surfaces externes du faisceau de fibres (26). Un collecteur de sang (18) situé dans la partie inférieure de l'échaneur thermique comporte un embout d'admission (30) et possède des parois de forme générale conique (60). Un dispositif de transfert (24) situé dans la partie supérieure de l'échangeur thermique dirige le sang vers la partie supérieure du faisceau de fibres (28) constituant l'oxygénateur. Le dispositif de transfert (24) comporte une paroi (26) de forme générale conique définissant une surface qui diffuse le sang de manière sensiblement uniforme autour de la partie supérieure du faisceau de fibres (28). Le sang ruisselle de haut en bas le long des surfaces externes du faisceau de fibres (28) vers un dispositif diffuseur qui recueille le sang oxygéné. Ledit dispositif diffuseur comporte une chambre annulaire (110) de collecte de sang. Un embout distributeur (32) de sang prolonge ladite chambre annulaire (110) de collecte de sang.

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