An endovascular delivery system includes a bifurcated prosthesis disposed on a delivery device and a snare catheter having a snare opening system. A sheath is slidably disposed over at least a portion of the prosthesis and at least a portion of the snare catheter. One end of the snare catheter resides external to the prosthesis in the delivery system and the other end at least partially resides in a limb of the prosthesis. A snare mechanism is disposed within the snare catheter that is capable of forming a loop external to the snare catheter through the opening and snaring a guidewire for placement in a limb of the prosthesis.
