Improved valved catheter

Details Improved valved catheter Improved valved catheter

A - Human Necessities

61

M

A61M 25/00 (2006.01)

Patent

CA 2117542

A valved catheter (1) having an elongate, flexible tubular element (10) defining a lumen (20) extending along an axis substantially parallel to the central axis (A) of said tubular element, and a unidirectional valve assembly (12, 12') near its distal end (16) which controls fluid flow in the tubular element. The valve is generally defined by a flap portion (24) and a base portion (26). The flap portion includes a flap valve surface (34) which is complementary to a base valve (36) surface when there is substantially no pressure difference between the lumen and outside the catheter. When a pressure differential exists between the lumen and outside the catheter, the flap valve surface and base valve surface separate to form an opening (30) for fluid flow therethrough. The direction of fluid flow through the valve aperture is determined by the pressure differential. A multi-lumen catheter assembly (l') is also disclosed.

Un cathéter à valve (1) comporte un tube souple allongé (10), définissant une lumière (20) qui est en pratique parallèle à l'axe central (A) de ce tube, ainsi qu'une valve unidirectionnelle (12, 12') proche de son extrémité distale (16) et chargée de moduler l'écoulement de fluide dans ce tube. Cette valve comprend schématiquement un rabat (24) et une base (26). Le rabat est muni d'un chant (34) qui vient s'adapter à celui de la base de la valve (36) lorsqu'il n'existe pratiquement pas de différence de pression entre la lumière et l'extérieur du cathéter. Dans le cas contraire, le chant du rabat s'écarte de celui de la base de la valve et ménage une ouverture (30) permettant le passage du fluide. La différence de pression régit alors le sens de passage du fluide. On décrit aussi un cathéter comportant plusieurs lumières (1').

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