A blood oxygenator having a structure provided with a substantially cylindrical interior (1) WALL OR core and an outer wall (2) defining an oxygenation chamber. The oxygenation chamber contains a bundle HOLLOW FIBER (3) fiber composite semipermeable microporous hollow TO BE AFFECTED ARE INTENDED FOR OUTSIDE THE BLOOD FLOWING IN oxygenation chamber. The oxygenation chamber is provided with inlet ducts (7A) and output (9A) to connect with the outside. HOLLOW FIBER (3) they are fixed at their ends, IN RINGS KNOWN AS polyurethane resin encapsulation, and are respectively connected to the inlet chambers and gas outlet (6.8) ENTRY FOR OXYGEN AND DISCHARGE CARBON dIOXIDE. The structure includes rods (10) extending from the inner wall of the structure and are divided into a PLURALILDAD SETS (10) which are arranged longitudinally along the length TOTAL DELNUCLEO generally parallel with the axis of the core (1) RODS (10) are adapted to produce a provision in the fiber bundle (3) so that the fiber bundle (3) Touch the outer wall (2) STRUCTURE IN THE REGIONS WHERE IS UP TO THE SHAFT (10) AND THAT the fiber bundle (3) is separated from the outer wall (2) and touch the inner wall (1) STRUCTURE IN THE REGIONS between adjacent rod assemblies (10).
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