Ptfe layers and methods of manufacturing

A - Human Necessities – 61 – L

Patent

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A61L 31/12 (2006.01) A61L 27/16 (2006.01) A61L 27/40 (2006.01) A61L 31/06 (2006.01) B29C 55/22 (2006.01) B32B 1/08 (2006.01) B32B 27/30 (2006.01)

Patent

CA 2604918

Single, continuous PTFE layers having lateral zones (60,62) of varied characteristics are described. Some of the lateral zone embodiments may include PTFE material having little or no nodal and fibril microstructure. Methods of manufacturing PTFE layers allow for controllable permeability and porosity of the layers, in addition to other characteristics. The characteristics may vary from one lateral zone of a PTFE layer to a second lateral zone of a PTFE layer. In some embodiments, the PTFE layers may act as a barrier layer in an endovascular graft or other medical device.

L'invention concerne des couches PTFE uniques continues présentant des zones latérales (60,62) à caractéristiques variées. Dans quelques modes de réalisation, les zones latérales peuvent comprendre du matériau PTFE présentant une petite microstructure nodale et de fibrilles ou ne présentant pas de telle microstructure. L'invention concerne également des procédés de fabrication de couches PTFE permettant d'obtenir une perméabilité et une porosité commandables des couches, en plus d'autres caractéristiques. Celles-ci peuvent être différentes d'une zone latérale d'une couche PTFE à une seconde zone latérale d'une couche PTFE. Dans quelques modes de réalisation, les couches PTFE peuvent agir comme une couche barrière dans une greffe endovasculaire ou un autre dispositif médical.

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