| http://www.w3.org/ns/prov#value | - The invention of any of claims 1, 2 or 3 wherein said endoprosthesis comprises two cone-shaped segments axially extending, respectively, from the ends of said endoprosthesis, said segments comprising loops of filament material and each having at its end a non-expandable retaining ring, one of said segments including a lining or coating of liquid impervious material.
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