A medical barrier includes a sheet of unsintered substantially unexpanded
hydrophilic polytetraflouroethylene (PTFE) polymer material having a
density in a range of about 1.2 gm/cc to about 2.3 gm/cc, and preferably
in the range of about 1.45 gm/cc to about 1.55 gm/cc, and having at least
one textured surface. In accordance with one embodiment, the sheet has
one textured surface and one substantially smooth surface, and has
substantially uniform strength in all directions.
