A biliary stent-graft

A - Human Necessities – 61 – F

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

Patent

CA 2329214

A stent-graft (10) which is particularly useful for applications in biliary ducts. An expandable stent is provided with a covering (13) of a material which is substantially impervious to body fluids and tissue ingrowth and has an increased resistance to bacterial attachment due to its lack of porosity and reduced surface texture. A preferred covering (13) is porous PTFE film rendered substantially non-porous by a coating of a polymeric material such as FEP. The resulting stent has a thin wall for minimum pre-deployment diameter and for minimum interference with fluid flow through the device after implantation. It has good flexibility, allowing its use in curved ducts.

La présente invention concerne un stent à greffer, particulièrement utile pour les applications dans les voies biliaires. Le stent de l'invention, expansible, est recouvert d'un revêtement réalisé dans une matière qui est sensiblement imperméable aux fluides corporels et à l'interposition tissulaire et qui possède une résistance accrue à la fixation bactérienne en raison de son manque de porosité et de sa structure de surface réduite. Un revêtement préféré est constitué d'un film poreux de PTFE rendu sensiblement non poreux par une couche de matière polymère telle que le FEP. On obtient de la sorte un stent dont la paroi mince permet d'atteindre un diamètre minimal avant déploiement et d'entraver le moins possible l'écoulement de fluide à travers le dispositif après l'implantation. Le stent de l'invention, en raison de sa bonne flexibilité, peut également être utilisé dans les voies courbes.

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