Leak prevention in blood oxygenators

A - Human Necessities – 61 – M

Patent

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Details

A61M 1/14 (2006.01) B01D 63/02 (2006.01) B29C 70/84 (2006.01) B65D 53/06 (2006.01) F28F 21/06 (2006.01)

Patent

CA 2241323

A tight seal is achieved in a blood oxygenator (10) between the potting of the heat exchanger fibers (22) and the rim (42) of the heat exchanger container (14) by extending the potting material (26) over the rim (42) and down, so that when the potting material (26) shrinks during cure, the potting (26) will become prestressed in the sealing direction against an outwardly facing wall of the container (14). The invention also provides a ring (50) coextensive with the rim (42) and spaced therefrom. The potting (26) extends into the ring (50). This forms an air gap (62) between the rim (42) and the ring (50) through which potting (26) can extend. As a result, there is no possible leakage path between the blood and the heat-exchange medium. Any leak that does occur discharges to atmosphere outside the container (14).

On obtient un joint étanche dans un oxygénateur sanguin (10) entre l'enrobage des fibres (22) de l'échangeur thermique et le bord (42) du récipient (14) contenant l'échangeur thermique. Pour ce faire, la matière d'enrobage (26) recouvre le bord (42) et s'étend vers le bas, de sorte que lorsque celle-ci (26) rétrécit en durcissant, elle est préétirée dans le sens de l'étanchéité contre une paroi extérieure du récipient (14). L'invention concerne également un anneau (50) adjacent au bord (42) et espacé de celui-ci. L'enrobage (26) s'étend à l'intérieur de l'anneau (50), de sorte qu'un espace d'air (62) est formé entre le bord (42) et l'anneau (50), à travers lequel ledit enrobage (26) peut se répandre. En conséquence, aucune voie de fuite n'est possible entre le sang et le milieu d'échange thermique. Toute fuite se produisant est en effet déversée dans l'atmosphère à l'extérieur du récipient (14).

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