Patent ID: 8163006

Claim:
An endoprosthesis comprising: an anchoring and sealing component having a cranial section comprising a tubular stent defining a longitudinal axis, the stent having an expansion ratio of greater than about 7 and less than about 14, wherein said expansion ratio is achieved by selection of a processing variable selected from the group consisting of the number of apexes or diamonds of the structure, the starting tube dimension, the final austenite temperature and a combination of two or more of aforementioned processing variables, a caudal section having at least two legs in fluid communication with the cranial section, each of the at least two legs comprising a plurality of individual stents, in a staggered arrangement with respect to one another and graft material affixed to at least a portion of the cranial section forming a single flow channel and the at least two legs thereby forming at least two fluid flow conduits in the caudal section, the at least two legs being attached to the cranial section at a bifurcation point and wherein one of the at least two legs is longer than the other by one stent, the at least two legs being attached to one another along the length of the legs up to the bifurcation point such that column strength is increased and wherein one leg comprises an individual stent that is affixed to the graft material, and wherein the stent of the leg and the stent of the cranial section are configured to be in abutting relation when the endoprosthesis is fully extended relative to the longitudinal axis and the other leg does not have a stent in abutting relation to the stent of the cranial section when the endoprosthesis is fully extended relative to the longitudinal axis; and at least two endolegs connectable to the at least two fluid flow conduits of the anchoring and sealing component.