Method for making eptfe and structure containing such eptfe,...

B - Operations – Transporting – 29 – C

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B29C 67/04 (2006.01) A61F 2/06 (2006.01) A61L 31/04 (2006.01) B29C 55/26 (2006.01)

Patent

CA 2605107

A method for making a vascular graft includes providing a PTFE green tube extrudate (12) which is un-sintered, and then initially expanding the un- sintered extrudate (17) to produce an initial node and fibril micro-structure therein. This is followed by heating the extrudate to raise the temperature thereof for a time period of sufficient duration such that the extrudate is partially sintered. The partially sintered extrudate is subsequently expanded (25) to make the vascular graft. The subsequent expansion produces a subsequent node and fibril micro~structure in the vascular graft. An alternative method for making a vascular graft includes providing a PTFE green tube extrudate which is un-sintered, longitudinally expanding the un~sintered extrudate to form an ePTFE tube structure, and radially expanding the un- sintered ePTFE tube structure. ePTFE made according to the method is fabricated into various structures, such as tube structures, filament structures, and sheet structures.

L'invention concerne un procédé destiné à fabriquer un greffon vasculaire et consistant à utiliser un extrudat tubulaire brut de PTFE (12) qui est non fritté, puis à soumettre l'extrudat non fritté (17) à une expansion initiale en vue de la production d'un noeud initial et d'une microstructure fibrillaire dans celui-ci. Ensuite, le procédé consiste à chauffer l'extrudat en vue d'en élever la température pendant une durée suffisante pour que l'extrudat soit partiellement fritté. L'extrudat partiellement fritté est soumis à une expansion subséquente (25) en vue de la fabrication du greffon vasculaire. L'expansion subséquente permet de produire un noeud subséquent et une microstructure fibrillaire dans le greffon vasculaire. Un autre procédé de fabrication d'un greffon vasculaire consiste à utiliser un extrudat tubulaire brut de PTFE qui est non fritté, à soumettre l'extrudat non fritté à une expansion longitudinale en vue de la formation d'une structure tubulaire de ePTFE, puis à soumettre la structure tubulaire de ePTFE non frittée à une expansion radiale. Le ePTFE fabriqué selon ce procédé peut être formé en diverses structures, telles que des structures tubulaires, des structures filamenteuses et des structures en feuilles.

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