High strength porous ptfe sheet material

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) A61F 2/00 (2006.01) A61L 27/00 (2006.01) A61L 27/16 (2006.01) A61L 31/04 (2006.01) A61F 2/06 (2006.01) A61F 2/10 (2006.01)

Patent

CA 2192457

A high strength, porous PTFE sheet material having high strength in all directions within the plane of the sheet material. The sheet material has, within the plane of the sheet, a higher minimum tensile strength, matrix tensile strength, secant modulus and matrix secant modulus than previously known porous PTFE sheet materials. The sheet material is a laminate of multiple layers of porous PTFE film, preferably uniaxially expanded film, wherein the orientation of the direction of the fibrils of any layer varies slightly, such as about ten degrees, from the orientation of the fibrils of the adjacent layer. The sheet material is particularly useful as a surgical repair patch and especially as a blood vessel repair patch because of its high strength, flexibility, biocompatibility and very low rate of suture line bleeding.

L'invention se rapporte à un matériau en feuille en PTFE poreux présentant une haute résistance dans tous les sens de son plan. La feuille de matériau présente dans son plan des valeurs supérieures de résistance minimale à la traction, de résistance minimale à la traction de la matrice, de module sécant minimal et de module sécant minimal de la matrice que les matériaux en feuille en PTFE poreux antérieurs connus. Le matériau en feuille est un stratifié de plusieurs couches de film PTFE poreux, de préférence de film étiré uniaxialement où l'orientation des fibrilles de n'importe quelle couche varie sensiblement, par exemple aux environs de dix degrés, à partir de l'orientation des fibrilles de la couche adjacente. Le matériau en feuille est notamment utilisé comme pièce de réfection chirurgicale, et notamment comme pièce de réfection des vaisseaux sanguins du fait de sa haute résistance, flexibilité et biocompatibilité et de son très faible taux de saignement sur la ligne de suture.

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