Self-expandable stent and stent-graft and method of using them

Details Self-expandable stent and stent-graft and method of using them Self-expandable stent and stent-graft and method of using them

A - Human Necessities

61

F

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

Patent

CA 2157575

The device is a foldable stent (122) or stent-graft (370) which may be delivered with (or on) a catheter or via surgical or other suitable techniques. The device is then expanded or unfolded. The expandable stent structure preferably utilizes at least one torsional member (100) generally aligned with the longitudinal axis of the stent (122). The stent (122) preferably has an undulating shape. It may be helically deployed to form the generally cylindrical shape eventually deployed as the stent (122) or it may be formed of one or more rings (302). The structure desirably is aligned to allow those undulating shapes in adjacent rings (322) or turns of the helix to be in phase. The adjacent undulating shapes may be held in that phased relationship using a flexible linkage (324) often made of a polymeric material. The stent (122) is self-expanding, kink-resistant, easily bent along its longitudinal axis, does not change its length during that expansion, and is able to provide collapsible support for otherwise frangible graft material. The graft component (134) cooperating with the stent (122) is tubular and may be a biocompatible polymeric or collagenous material or combinations of the two which may, if desired, be reinfored with fibers.

Appareil consiste en un extenseur repliable (122), ou une greffe à extenseur repliable (370), pouvant être mis en place à l'aide d'un cathéter, ou de techniques chirurgicales ou autres, puis déployés. Sa structure déployable comporte au moins un élément de torsion (100) généralement aligné sur l'axe longitudinal de l'extemseur (122). Ledit extenseur (122), de préférence de forme ondulée, peut être déployé en hélice pour prendre finalement une forme généralement cylindrique, annulaire ou pluriannulaire (302). Sa structure est de préférence alignée pour permettre aux formes ondulées des anneaux contigus (322) ou aux spires de l'hélice d'être en phase. Les formes ondulées contiguës peuvent être maintenues en phase par un lien flexible (324) souvent en polymère. L'extenseur (122) est autodéployable, il est non vrillable, il est facile à plier selon son axe longitudinal, il ne varie pas en longueur lors de son déploiement et il est susceptible de servir de support repliable à du matériel de greffe, qui autrement serait cassable. Le greffon (134) associé à l'extenseur (122) est tubulaire et peut être en polymère biocompatible ou en collagène ou leur combinaison, et éventuellement renforcé de fibres de verre.

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