An anchoring and sealing component of a device for repairing abdominal aortic aneurysms comprises attached bifurcated legs for increasing the column strength thereof. The bifurcated legs comprise staggered stents so that nesting is possible during delivery. In one embodiment, an endoprosthesis comprises: a cranial section having a substantially tubular structure configured to anchor and seal the endoprosthesis within a vessel a caudal section having at least two legs in fluid communication with the cranial section, the at least two legs each comprising a substantially tubular structure graft material attached to at least a portion of the cranial section and to the at least two legs thereby forming at least two fluid flow conduits and a connection means for joining the at least two fluid flow conduits.
