Helical stent having improved flexibility and expandability

Details Helical stent having improved flexibility and expandability Helical stent having improved flexibility and expandability

A - Human Necessities

61

F

A61F 2/06 (2006.01)

Patent

CA 2493719

A stent includes a central portion of helically wound undulations formed of struts, cylindrical end portions, and transition zones between the helical portion and the cylindrical portions. According to a first aspect of the invention, the torsional flexibility of the stent is maximized by having bridges connecting adjacent winding be interrupted by the maximum possible number of undulations. In a preferred design, each winding includes nineteen undulations around the circumference, bridges are provided every five undulations. According to a second aspect of the invention, uniform opening of the transition zone is achieved by altering the width, and thereby the flexibility, of a series of struts in accordance with their lengths. Specifically, the long transition zone struts are made wider.

L'invention concerne un stent comportant une partie centrale d'ondulations hélicoïdales faites d'entretoises, des parties d'extrémité cylindriques et des zones de transition entre la partie hélicoïdale et les parties cylindriques. Selon un premier aspect de l'invention, la flexibilité en torsion du stent est maximisée du fait que les ponts reliant les enroulements adjacents limités par le nombre maximum possible d'ondulations. Dans un mode de réalisation préféré, chaque enroulement compte dix-neuf ondulations autour de la circonférence, avec des ponts toutes les cinq ondulations. Selon un second aspect de l'invention, l'ouverture uniforme de la zone de transition s'obtient par modification de la largeur, et du coup de la souplesse, d'une série d'entretoises en fonction de leur longueur. Spécifiquement, les longues entretoises de la zone de transition sont plus larges.

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