Radiopaque super-elastic intravascular stent

A - Human Necessities – 61 – F

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A61F 2/90 (2006.01)

Patent

CA 2711484

The intravascular stent is formed from a composite wire includes an inner core (12) of. radiopaque metal, a polymer layer (16) coaxially disposed about the inner core, and an outer metal layer (18) coaxially disposed about the polymer layer. The intermediary polymer layer acts as a barrier material between the inner core and the outer sheath, so that the inner core and outer sheath may be made of dissimilar metallic layers, and the intermediary polymer layer will prevent a galvanic reaction between the inner core and the peripheral metal layer. The intravascular stent (20) has ends (22, 24) flared radially outwardly to prevent radially and longitudinally inward deformation of the ends of the stent when the stent is disposed in a desired location in a patient's vasculature.

L'invention concerne un stent intravasculaire formé à partir d'un fil composite, qui comprend un cur interne en métal radio-opaque, une couche polymère disposée co-axialement autour du cur interne, et une couche métallique externe disposée co-axialement autour de la couche polymère. La couche polymère intermédiaire agit en tant que barrière entre le cur interne et la gaine externe. Le cur interne et la gaine externe peuvent ainsi être constitués de couches métalliques dissemblables, et la couche polymère intermédiaire empêche une réaction galvanique entre le cur interne et la couche métallique périphérique. Le stent intravasculaire comporte des extrémités qui s'étendent radialement vers l'extérieur pour empêcher une déformation radiale et longitudinale vers l'intérieur des extrémités du stent lorsque le stent est placé à un emplacement souhaité dans la vasculature d'un patient.

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