Differentially expanded vascular graft

Details Differentially expanded vascular graft Differentially expanded vascular graft

G - Physics

05

B

G05B 19/418 (2006.01) A61F 2/06 (2006.01) B29C 55/00 (2006.01)

Patent

CA 2603098

A differentially expanded vascular graft (10) for implantation within a body includes a PTFE tube (12) formed of a homogeneous material. The PTFE tube has a longitudinal first portion (14) which has been longitudinally expanded, and a longitudinal second portion (16) which has been longitudinally expanded. The first and second portions have respective microstructures which are different from one another. A method and apparatus for making the differentially expanded vascular graft of the present invention facilitates the formation of the various expanded portions of the PTFE tube. A quality control mechanism includes measuring a characteristic of the microstructure and re-expanding the PTFE tube if characteristic is not sufficiently close to a reference.

L'invention concerne un greffon vasculaire à dilatation différentielle (10) destiné à être implanté à l'intérieur d'un corps. Le greffon comporte un tube en PTFE (12) constitué d'un matériau homogène. Le tube en PTFE possède une première partie longitudinale (14) qui a été dilatée dans le sens de la longueur, et une deuxième partie longitudinale (16) qui a été dilatée dans le sens de la longueur. Les première et deuxième parties comportent des microstructures respectives différentes l'une de l'autre. Un procédé et un appareil de fabrication du greffon vasculaire à dilatation différentielle de l'invention facilitent la formation des diverses parties dilatées du tube en PTFE. Un mécanisme de contrôle de la qualité comporte la mesure d'une caractéristique de la microstructure et la redilatation du tube en PTFE si la caractéristique n'est pas suffisamment proche d'une référence.

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