Stent graft prosthesis

A stent graft prosthesis comprising:

• a tubular fabric member having at least first and second ends, and a length Lf extending between the first and second ends, and having an open lumen diameter Df;
• wherein at least one of the first and second ends of the tubular fabric member is supported by a combination of two cooperating ring stents of different configurations, one of the two cooperating ring stents of different configurations having at least one V-shaped portion attached to the tubular fabric member at only the at least one V-shaped portion, and each one of the two cooperating ring stents of different configurations is compressible into a folded shape to provide a compact delivery form of the stent graft prosthesis, and the tubular fabric member is attached at selected points to each of the two cooperating ring stents of different configurations, and the two cooperating ring stents of different configurations are free to move relative to one another at points where one of the two cooperating ring stents of different configurations crosses the other one of the two cooperating ring stents of different configurations, and that one of the two cooperating ring stents of different configurations is constrained from over-dilation by the other one of the two cooperating ring stents of different configurations;
• and
• wherein one of the two cooperating ring stents at the at least one of the first and second ends of the tubular fabric member has curvilinear portions exposed beyond the length Lf of the tubular fabric member.

A stent graft prosthesis comprising:

• a tubular graft member;
• a shape-set foldable ring stent having one or more V-shaped hinge portions and curvilinear portions therebetween, wherein the shape-set foldable ring is attached to the tubular graft member along only the V-shaped hinge portions, in combination with an outer ring stent that is compressible into a folded saddle shape having two peaks and two valleys portions, as combined end-sealing stents for the tubular fabric member of a stent graft prosthesis to be deployed as a repair in a natural vessel, the saddle shaped end ring stent having two peak and two valley portions and being configured as the overlying outer ring stent and slidably crossing portions of the shape-set foldable ring stent whereby upon deployment of the stent graft prosthesis the shape-set ring stent expands radially, and perpendicularly to the walls of the natural vessel being repaired which radial expansion urges the saddle shaped ring stent into a desired round cross-sectional shape whilst preventing the outer saddle shaped end ring stent from distorting into a so-called petal-shape or ovalling deformation;
• and
• wherein one of the two cooperating ring stents at the at least one of the first and second ends of the tubular fabric member has curvilinear portions exposed beyond the length Lf of the tubular fabric member.