An asymmetrical porous ptfe form and method of making

C - Chemistry – Metallurgy – 08 – J

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C08J 9/36 (2006.01) A61F 2/06 (2006.01) A61L 27/16 (2006.01) B29C 67/00 (2006.01) B29C 33/56 (2006.01) B29C 53/58 (2006.01) B29C 55/00 (2006.01)

Patent

CA 2198883

An asymmetrical form of porous PTFE having substantially different dimensions at different points along the length of the form. If the form is, for example, a tubular form, the different dimensions may be thickness or diameter or both. The form is preferably a tubular form which is preferably tapered having opposing ends with large and small inside diameters respectively wherein the wall thickness of the large diameter end is greater than or equal to the wall thickness of the small diameter end. Tapered PTFE tubes of this type are particularly useful as implantable vascular grafts. A method of producing these asymmetrical porous PTFE forms is also described.

Une forme asymétrique en PTFE poreux présente des dimensions sensiblement différentes en différents points sur la longueur de la forme. Si la forme est une forme tubulaire, par exemple, les dimensions différentes peuvent être l'épaisseur, ou le diamètre ou les deux. La forme est de préférence une forme tubulaire qui est évasée aux extrémités opposées, avec des diamètres intérieurs grand et petit respectivement, où l'épaisseur de paroi de l'extrémité de grand diamètre est supérieure ou égale à l'épaisseur de paroi de l'extrémité de petit diamètre. Des tubes en PTFE évasés de ce type sont particulièrement utiles comme greffons vasculaires implantables. Un procédé de production de ces formes asymétriques en PTFE poreux est également décrit.

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