Stent with reinforced struts and bimodal deployment

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/06 (2006.01)

Patent

CA 2241558

The invention is directed to an expandable stent for implantation in a body lumen, such as a coronary artery or peripheral vein. The stent consists of a plurality of radially expandable cylindrical elements generally aligned on a common longitudinal stent axis and interconnected by one or more interconnecting members placed so as to limit longitudinal contraction during radial expansion. The individual radially expandable cylindrical elements are formed in a serpentine pattern having bends alternating in peaks and valleys designed to expand evenly under radial stress, and to maximize the overall radial expansion ratio. Each peak and valley includes reinforcing members that extend across and are proximate to each bend. Sizing and construction of the struts forming the peaks and valleys can create bimodal deployment wherein the struts bend under increasing stresses to enable the stent to expand to larger diameters.

L'invention porte sur un tuteur déployable à implanter dans une lumière corporelle, comme l'artère coronaire ou une veine périphérique. Le tuteur est composé d'une série d'éléments cylindriques, à déploiement radial, s'alignant généralement sur un axe commun longitudinal de tuteur et interreliés par au moins un élément d'interconnexion qui est placé de façon à limiter la contraction longitudinale au cours du déploiement radial. Chaque élément cylindrique à déploiement radial prend une forme en serpentin et comporte des courbes, alternant entre des sommets et des creux, conçues pour se déployer uniformément sous une tension radiale et pour maximiser la vitesse générale de déploiement radial. Chacun des sommets et des creux inclut des éléments de renforcement se prolongeant d'un côté à l'autre des courbes et placés près de ces dernières. La taille et la fabrication des montants formant les sommets et les creux peuvent créer un déploiement bimodal dans lequel les montants se plient sous des tensions croissantes pour permettre au tuteur d'atteindre des diamètres plus grands.

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