Low profile non-symmetrical bare alignment stents with graft

A stent graft configured for treatment of a thoracic ascending aortic dissection, the stent graft comprising:

• a proximal stent and a distal stent each including
• a plurality of narrower apices defining a generally circular first stent end and comprising
• first and second generally straight portions and
• a first curved portion disposed between the first and second straight portions and comprising a first radius of curvature;
• and
• a plurality of broader apices defining a generally circular second stent end and comprising
• third and fourth generally straight portions and
• a second curved portion disposed between the third and fourth straight portions and comprising a second radius of curvature that is greater than the first radius of curvature, and
• where at least one of the first and second generally straight portions is continuous with at least one of the third and fourth generally straight portions;
• a tubular graft material body secured to and extending between the proximal and distal stents, forming a patent fluid passage between them;
• where each of the stents is secured to the graft material such that its broader apices extend beyond an end of the tubular graft material body;
• and
• where an outer diameter defined by the broader apices of the generally circular second stent end is greater than an outer diameter defined by the narrower apices of the generally circular first stent end;
• and
• at least one intermediate stent secured to the graft material between the proximal and distal stents, the at least one intermediate stent providing columnar support to maintain an open geometry of the tubular graft material body,
• where the first radius of curvature is from about 0.5 mm to about 1.5 mm,
• where the second radius of curvature is from about 4 mm to about 9 mm, and
• where a ratio of the first radius of curvature to the second radius of curvature is about 1:2.6to about 1:18, and
• where each of the proximal stent and the distal stent comprises at least one uncovered region.