Covered stent and method of making it

A - Human Necessities – 61 – F

Patent

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A61F 2/06 (2006.01)

Patent

CA 2386624

A method of making a covered stent comprises the steps of producing a stent (1) having a diameter corresponding to an unexpanded state of the stent (1) and producing a tube (2) of a film material. The film material of the tube (2) should be shrinkable by exposure to an elevated temperature and the tube (2) should, before shrinking, have a greater diameter than the stent (1). As further steps of the method, the stent (1) is introduced into the tube (2), and the tube (2) is exposed to the elevated temperature for reducing the diameter of the tube (2) such that the stent (1) is affixed within the tube (2). The tube may be longer than the stent such that the ends of the tube may be introduced into the ends of the stent and affixed by short sections of a stent material. Collars may be formed at the ends of the tube and may also be covered by the film material.

La présente invention concerne un procédé de fabrication d'un stent recouvert qui consiste à produire un stent (1) d'un diamètre correspondant à un état déployé de ce stent (1) et à produire un tube (2) de matériau film. Le matériau film de ce tube (2) doit être rétractable lorsqu'il est exposé à une température élevée et ce tube (2) doit, avant rétraction, posséder un plus grand diamètre que celui du stent (1). Puis ce stent (1) est introduit dans le tube (2), et ce tube (2) est exposé à une température élevée de façon à réduire le diamètre de ce tube (2) de sorte que le stent (1) soit fixé dans le tube (2). Le tube peut être plus long que le stent de façon que les extrémités du tube puissent être introduites dans les extrémités du stent et fixées par de courtes sections du matériau du stent. On peut former des manchons aux extrémités du tube et ces manchons peuvent aussi être recouverts par le matériau film.

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