New vascular prostheses

A - Human Necessities – 61 – F

Patent

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A61F 2/06 (2006.01)

Patent

CA 2685050

A vascular prosthesis is disclosed, comprising a forked tube, having: an inflow tube with an inflow end (6); a primary distal outflow branch with a primary distal outflow end (8); and a secondary proximal outflow branch with a secondary proximal outflow end (7). The two outflow ends are directed in different directions and the two outflow branches in the vicinity of the bifurcation (9) have different cross-sectional areas. Further, the secondary proximal outflow branch is more curved than the primary distal outflow branch, and the secondary proximal outflow branch in the vicinity of the bifurcation has a smaller cross-sectional area than the primary distal outflow branch. Hereby, energy losses at flow bifurcations is adapted to the bypass situation to even out the level of shear stress, thereby avoiding areas with low shear stress and decreasing the tendency for turbulent flow, thus reducing the risk of graftstenosis.

L'invention concerne une prothèse vasculaire qui comprend un tube en y, ayant : un tube d'amenée avec une extrémité d'entrée (6); une ramification de sortie distale primaire avec une extrémité de sortie distale primaire (8); et une ramification de sortie proximale secondaire avec une extrémité de sortie proximale secondaire (7). Les deux extrémités de sortie sont dirigées dans des directions différentes et les deux ramifications de sortie à proximité de la bifurcation (9) ont des surfaces de section transversale. En outre, la ramification de sortie proximale secondaire est plus courbée que la ramification de sortie distale primaire, et la ramification de sortie proximale secondaire à proximité de la bifurcation a une surface de section transversale plus petite que la ramification de sortie distale primaire. Alors, les pertes d'énergie au niveau des bifurcations fluidiques sont adaptées à la situation de pontage afin d'égaliser le niveau de la force de cisaillement, évitant ainsi les surfaces avec une faible force de cisaillement et en réduisant la tendance de flux turbulent, en réduisant ainsi le risque de sténose du greffon.

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