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 2/04 (2006.01)

Patent

CA 2261941

This invention is a medical device and a method of using it. The device is a foldable stent or stent- graft 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 generally aligned with the longitudinal axis of the stent. The stent preferably has an undulating shape It may be helically deployed to form the generally cylindrical shape eventually deployed as the stent or it may be formed of one or more rings. The structure desirably is aligned to allow those undulating shapes in adjacent rings or turns of the helix to be in phase. The adjacent undulating shapes may be held in that phased relationship using a flexible linkage, often made of a polymeric material. The stent's configuration allows it to be folded or otherwise compressed to a very small diameter prior to deployment without changing the length of the stent. The stent 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 cooperating with the stent is tubular and may be a biocompatible polymeric or collagenous material or combinations of the two which may, if desired, be reinforced with fibers. The invention involves procedures for deploying stem s or stent-grafts which have been folded, bound, or otherwise collapsed to significantly smaller diameters for insertion into a human or animal body. The deployment procedures may involve the use of an outer sleeve to maintain the stent or stent-graft at a reduced diameter or may involve a "slip-line" to hold and then to release the device.

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