Patent ID: 8784473

Claim:
An endoprosthesis comprising: a stent structure having a loop structure through which a filament extends, said stent structure having a crossover structure which is contiguous to said loop structure, said stent structure having an elongate member, first and second longitudinal portions of which overlap to define said crossover structure, wherein the loop structure and the crossover structure which is contiguous to said loop structure collectively form a perimeter of a transverse-facing opening wherein the crossover structure is the only crossover structure along the perimeter of the opening; a guard structure secured to said stent structure and located adjacent to said crossover structure to obstruct displacement of the filament between said longitudinal portions of said elongate member of said crossover structure; and a cover secured to said stent structure, wherein the endoprosthesis comprises an uncovered portion of the stent structure disposed between the guard structure and the cover.