Macroscopically perforated porous polytetrafluoroethylene materi

Details Macroscopically perforated porous polytetrafluoroethylene materi Macroscopically perforated porous polytetrafluoroethylene materi

1996-12-04

1999-01-12

Watkins, William

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

428137, 428910, 428421, 428422, 4283166, 4283044, 4283179, 428323, 2642888, 264156, 264118, 264127, 2642356, 2642358, 264175, 264291, 156229, 15624411, 15624418, B29C 5500, B28B 148, B26F 100, B32B 324

Patent

active

058585052

ABSTRACT:
A macroscopically perforated porous expanded polytetrafluoroethylene sheet material having a microstructure of nodes interconnected by fibrils wherein the perforations have a minimum diameter of about 0.1 mm and wherein the orientation of a fibril varies as a function of the proximity of a fibril to the edge of a perforation. The length of the fibrils may also vary as a function of the proximity of a fibril to the edge of a perforation. The sheet material may alternatively be provided in a tubular form.

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patent: 4842794 (1989-06-01), Hovis et al.
patent: 4964992 (1990-10-01), Goldsmith et al.
patent: 5167890 (1992-12-01), Sasshofer et al.
"Improved tissue ingrowth and anchorage of expanded polytetrafluoroethylene by perforation: an experimental study in the rat" Biomaterials, Jan. 1991; 12:22-24.

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