Method for manufacturing eptfe products

B - Operations – Transporting – 29 – C

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Details

B29C 47/24 (2006.01) A61L 29/04 (2006.01) B29C 47/00 (2006.01) B29C 47/86 (2006.01)

Patent

CA 2161449

An improved method is provided for extruding ePTFE tube (12) for use in medical applications. A tube (12) of PTFE is extruded, preferably in an extrusion process, using counter-rotated die components (22, 26). The die component (16) is maintained at a constant temperature during processing. The resulting green tube (12) has enhanced fibrous state formation in a direction perpendicular to the direction of extrusion. The PTFE green tube (12) is then subjected to secondary operations such as stretching and expansion to yield medical product. The ePTFE tube (12) structure is defined by nodes interconnected by elongate fibrils. Both the nodes and fibrils are substantially randomly tilted with respect to the longitudinal axis of the tube (12). This particular structure yields a tube (12) which exhibits a high degree of radial tear strength useful in medical applications.

Cette invention se rapporte à un procédé amélioré pour produire par extrusion un tube en PTFEe (12) à utiliser dans des applications médicales. A cet effet, un tube (12) de PTFE est extrudé, de préférence au cours d'un processus d'extrusion, au moyen d'éléments de filière en contre-rotation (22, 26). L'élément de filière (16) est maintenu à une température constante pendant le processus d'extrusion. Le tube semi-fini qui en résulte (12) présente une meilleure capacité de formation de la texture fibreuse dans une direction perpendiculaire à la direction d'extrusion. Le tube semi-fini en PTFE (12) est ensuite soumis à des opérations secondaires, telles que l'étirage et l'expansion, pour donner un produit à usage médical. La structure du tube en PTFEe (12) est définie par des noeuds que relient des fibrilles allongées. Les noeuds et les fibrilles sont essentiellement inclinés de façon aléatoire par rapport à l'axe longitudinal du tube (12). Cette structure particulière donne un tube (12) qui possède un degré élevé de résistance à la déchirure radiale, ce qui est utile dans les applications médicales.

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