Patent ID: 8034096

Claim:
A stent-graft assembly, comprising: at least one unitary stent structure comprising a luminal surface and an abluminal surface and having at least a first radial opening and a second radial opening, said first and second radial openings being axially and circumferentially defined by a plurality of struts, said first and second radial openings extending through said stent structure between said luminal surface and said abluminal surface, wherein said first and second radial openings are spaced apart along a first direction; a first graft layer disposed along at least a portion of said luminal surface of said stent structure thereby fully covering luminal sides of said first and second radial openings; a second graft layer disposed along at least a portion of said abluminal surface of said stent structure thereby fully covering abluminal sides of said first and second radial openings; a first attached area securing said first graft layer and said second graft layer together through a portion of said first radial opening, wherein a first unattached margin in which said first and second graft layers are not secured to each other is disposed between said first attached area and an edge of said first radial opening; a second attached area securing said first graft layer and said second graft layer together through a portion of said second radial opening, wherein a second unattached margin in which said first and second graft layers are not secured to each other is disposed between said second attached area and an edge of said second radial opening; and wherein said first and second unattached margins are oriented along said first direction and on a same side of said first and second attached areas, thereby allowing said first and second graft layers to move along said first direction relative to said stent.