Covered stent with encapsulated ends

Details Covered stent with encapsulated ends Covered stent with encapsulated ends

A - Human Necessities

61

F

A61F 2/06 (2006.01)

Patent

CA 2361067

A portion of a covered stent is encapsulated with ePTFE, so that the unencapsulated portion, which is covered by a single ePTFE covering, of the stent unimpaired flexibility. One surface of the stem, either the luminal or abluminal surface, is covered by a single continuous layer of ePTFE, while limited regions, preferably near the ends of the stent, of the other surface are also covered by ePTFE. The regions covered by ePTFE on both surfaces become encapsulated when the ePTFE of one layer becomes bonded to second layer. By leaving a middle region of the stent unencapsulated, the stent retains flexibility similar to a bare stent, thereby reducing the loading and deployment forces.

La présente invention concerne une endoprothèse recouverte dont une partie est encapsulée avec du polytétrafluoroéthylène expansé (PTFEe), de manière à ce que la partie non encapsulée, recouverte d'une seule couche de PTFEe, permette à l'endoprothèse de conserver une souplesse intacte. Une des surfaces de l'endoprothèse, luminale ou abluminale, est recouverte d'une couche unique continue de PTFEe, alors que des parties limitées, de préférence voisines des extrémités, de l'autre surface sont aussi recouvertes de PTFEe. Les parties recouvertes de PTFEe sur les deux surfaces deviennent encapsulées lorsque le PTFEe d'une des couches devient lié à la seconde couche. En laissant une région de la partie médiane non encapsulée, l'endoprothèse conserve une souplesse similaire à celle d'une endoprothèse nue, ce qui permet de réduire les forces de charge et de déploiement.

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