Braided stent and method for its manufacture

Details Braided stent and method for its manufacture Braided stent and method for its manufacture

A - Human Necessities

61

F

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

Patent

CA 2506995

A stent and method for making the stent are provided. The stent comprises regions of differing numbers of braided filaments to provide a stent with different dimensions and/or properties in different regions along the stent length. A preferred stent (10) comprises a first (11) and second plurality (12) of braided filaments each braided together. The second plurality of braided filaments is braided into the first plurality of braided filaments to form a region of different properties than the first. A preferred embodiment is a stent (100) having a narrower diameter along a more flexible region (110) and a broader diameter along a more rigid region (120). Also included is a method of constructing a braided stent in accordance with the above. The method comprises the steps of braiding a first plurality of filaments to form the flexible portion, combining a second plurality of filaments to the first plurality of filaments, and then braiding the second plurality of filaments with the first plurality of filaments to form the more rigid region from the combination of the first and second plurality of filaments, wherein the second plurality of filaments are braided only in the rigid region.

L'invention concerne un stent ainsi qu'un procédé de fabrication de celui-ci. Ce stent comprend des régions constituées de différents nombres de filaments tressés afin d'obtenir un stent avec différentes dimensions et/ou propriétés dans différentes régions de sa longueur. De préférence, ce stent (10) comprend un premier (11) et un second (12) ensembles de filaments tressés, tressés ensemble. Le second ensemble de filaments tressés est tressé avec le premier ensemble de filaments tressés pour former une région avec des propriétés différentes de celles du premier ensemble. Dans un mode de réalisation préféré, un stent (100) possède un diamètre plus étroit le long d'une région plus flexible (110) et un diamètre plus large le long d'une région plus rigide (120). L'invention concerne également un procédé de fabrication d'un stent tressé tel que décrit ci-dessus. Ce procédé comprend les étapes consistant à tresser un premier ensemble de filaments pour former la partie flexible, à combiner un second ensemble de filaments au premier ensemble de filaments, puis à tresser le second ensemble de filaments avec le premier ensemble de filaments pour former la région plus rigide, à partir de la combinaison des premier et second ensembles de filaments, le second ensemble de filaments étant tressé uniquement dans la région rigide.

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