Delivery system having a rapid pusher assembly for...

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/06 (2006.01)

Patent

CA 2451293

A pusher assembly for a delivery system for a self-expanding stent (6) which is delivered by proximal withdrawal of a sheath (4) radially surrounding the stent has a stent pusher element (8) which defines a lumen for a guidewire (2), a pusher strand (16) that extends to the proximal end of the delivery system and bears an end-wise compressive stress during release of the stent. A transfer shaft (12) links the distal end of the pusher strand (16) to the pusher element (8) and lies side-by-side with the guidewire (2). In a rapid exchange version, an adapter (20) provides two lumens side-by-side, one (22) carrying the pusher strand (16) and the other (14) defining a proximal guidewire part. To the adapter is mounted the proximal end of the stent sheath (4). The system allows modular (14) construction, a tapered tip (4A) on the sheath, and an uncluttered internal configuration which facilitates passage of pulses (F) of liquids from the proximal to the distal end of the system.

L'invention concerne un ensemble poussoir destiné à un système de pose d'un stent auto-expansible (6), ce dernier étant mis en place par retrait proximal d'une gaine (4) entourant radialement le stent. Cet ensemble poussoir comprend un élément poussoir (8) définissant une lumière pour un fil-guide (2), ainsi qu'un brin poussoir (16) s'étendant jusqu'à l'extrémité proximale du système de pose et supportant un effort de compression axiale au cours du largage du stent. Un arbre de transfert (12) juxtaposé au fil-guide (2) relie l'extrémité distale du brin poussoir (16) à l'élément poussoir (8). Dans une version à échange rapide, un adaptateur (20) comprend deux lumières côte à côte, l'une (22) portant le brin poussoir (16) et l'autre (14) définissant une partie proximale du fil-guide (2). L'extrémité proximale de la gaine (4) de stent est montée sur l'adaptateur. Ce système permet d'obtenir une construction modulaire (14), une pointe conique (4A) sur la gaine et une configuration interne optimale facilitant le passage d'impulsions (F) de liquides de l'extrémité proximale à l'extrémité distale du système.

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