Kink resistant stent-graft

Details Kink resistant stent-graft Kink resistant stent-graft

A - Human Necessities

61

F

A61F 2/06 (2006.01) A61F 2/00 (2006.01)

Patent

CA 2246157

This invention is a stent graft (2) including a stent member (6) having an inner surface and an outer surface, a generally tubular graft member (4) and a coupling member (8) that couples the stent member (6) to the graft member (4). The coupling member (8), which in the preferred embodiment is in the form of a ribbon, covers only a portion of the inner or outer surface of the stent member (6) and secures the stent member (6) and graft member (4) to one another. Alternatively, the coupling member (8) can be described as interconnecting less than entirely the inner or outer surface of the graft member (4) to the stent member (6). With this construction, regions of the stem member (6) do not interface with the coupling member (8). Shear stresses between the stent member (6} and the coupling member (8) and the risk of tearing the graft (4) or coupling member (8) or delamination therebetween may he reduced as compared to a fully enveloped stent member (6). This construction also provides improved flexibility and kink resistance.

Stent (2) à greffer qui comporte un élément stent (6) doté d'une surface interne et d'une surface externe, un élément de greffe (4) généralement tubulaire et un élément de couplage (8) qui couple l'élément stent (6) à l'élément de greffe (4). L'élément de couplage (8) qui, dans le mode de réalisation préféré, a la forme d'un ruban, couvre seulement une partie de la surface interne ou externe de l'élément stent (6) et fixe l'un à l'autre l'élément stent (6) et l'élément de greffe (4). Alternativement, l'élément de couplage (8) peut être décrit comme interconnectant moins de la surface entière interne ou externe de l'élément de greffe (4) à l'élément stent (6). Grâce à cette structure, certaines régions de l'élément stent (6) n'ont pas d'interface avec l'élément de couplage (8). Des contraintes de cisaillement entre l'élément stent (6) et l'élément de couplage (8) et le risque de déchirure de la greffe (4) ou de l'élément de couplage (8) ou de séparation par délaminage entre les deux peuvent être réduits par comparaison à un élément stent (6) complètement enveloppé. Cette structure permet également une souplesse et une résistance aux plis améliorées.

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