Method for producing a single layer high density expanded...

Details Method for producing a single layer high density expanded... Method for producing a single layer high density expanded...

B - Operations, Transporting

29

C

B29C 55/24 (2006.01) B29C 44/56 (2006.01) C08J 5/00 (2006.01) C08L 27/18 (2006.01)

Patent

CA 2710960

A high density microwall ePTFE structure with increased radial strength and suture retention and a method for producing the same. The inventive material also achieves a sizeable reduction in the wall thickness and porosity. The method of manufacture involves the manipulation of a standard extruded ePTFE graft. The graft is placed within a restraining tube and is balloon dilated (20) to approximately four times its original diameter, after which it is placed onto a like-sized mandrel (30) that provides an interference fit. This loaded mandrel is placed into a calendering device (40) where the entire graft wall is moved between metal plates until sufficiently calendered. The loaded mandrel is then placed into a heated furnace or oven (80) at a temperature above the crystalline melt point of PTFE to lock the changes into the microstructure. The final product has the desired characteristics of reduced wall-thickness, high density, above-average radial strength and enhanced suture retention.

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