Radially expandable polytetrafluoroethylene and expandable...

A - Human Necessities – 61 – M

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A61M 29/00 (2006.01) A61F 2/06 (2006.01) A61L 31/04 (2006.01) B29C 55/26 (2006.01) B29C 67/04 (2006.01) A61F 2/00 (2006.01)

Patent

CA 2193983

Extended, stretched, and sintered tubular PTFE materials (50), which have been radially dilated and resintered, are produced which are suited for use in the medical field, e.g., as liners and covers with support structures (52) for expandable endovascular stents (48). The PTFE materials have an unusually low REC (Radial Expansion Coefficient) and RER (Radial Expansion Ratio), permitting thin-walled PTFE tubes to expand about 50 % to 400%, or more, before the decline in tensile strength. Tube-form medical implants comprising such PTFE material, methods for making such implants, and endovascular stents formed with such implants are described.

Des matériaux à base de PTFE tubulaires, extrudés, étirés et frittés (50) qui ont été radialement dilatés et refrittés, sont produits et utilisés dans le domaine médical, par exemple comme garniture et couverture pour des structures de support (52) destinées à des extenseurs endovasculaires expansibles (48). Les matériaux en PTFE ont un coefficient d'expansion radiale (CER) et un rapport d'expansion radiale (RER) exceptionnellement bas, ceci permettant une expansion de 50 % à 400 % des tubes en PTFE à paroi mince, voire davantage, avant que la résistance à la traction ne commence à faiblir. Des implants médicaux tubulaires constitués avec ce matériau en PTFE, des procédés de fabrication de tels implants, et des extenseurs endovasculaires formés avec de tels implants sont également décrits.

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