Stent with variable stiffness

Details Stent with variable stiffness Stent with variable stiffness

Category

A - Human Necessities

Subcategory

61

Subsubcategory

F

IPC codes

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

Type

Patent

Patent number

CA 2512723

Description

A graftless prosthetic stent for treatment of vascular lesions such as aneurysms and arterio-venous fistulas, especially in neurovascular vessels, comprises a continuous helical ribbon formed of a shape-retaining metal having a transition temperature at which the stent expands from its contracted condition to a radially expanded condition, the stent remaining substantially cylindrical in its contracted and expanded conditions. The helical windings have variable width, thickness, number or size of openings, or combinations of these features, which affect the stiffness, rate of expansion at the transition temperature, and the area of vessel wall covered by the stent. A catheter device which includes the stent, and a method of treatment using the stent are also provided.

L'invention concerne une endoprothèse pour le traitement des lésions vasculaires du type anévrismes et fistules artério-veineuses, notamment dans le système neurovasculaire, qui comprend un ruban hélicoïdal continu en métal à mémoire de forme ayant une température de transition à laquelle l'endoprothèse subit une expansion radiale à partir de son état contracté. L'endoprothèse reste sensiblement cylindrique à l'état contracté et déployé. Les enroulements hélicoïdaux sont variables en largeur, épaisseur, nombre d'ouvertures, ou combinaisons correspondantes, ce qui affecte la rigidité, le degré d'expansion à la température de transition, et la zone de paroi de vaisseau couverte par l'endoprothèse. L'invention concerne un dispositif à cathéter incluant l'endoprothèse et un procédé de traitement reposant sur l'utilisation de l'endoprothèse.

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