An endovascular delivery system includes an endovascular prosthesis, an elongate outer tubular sheath, an elongate inner tubular member, a handle assembly for moving the outer tubular sheath and the inner tubular member; an elongate guidewire slidably disposed within the inner tubular member; and an inflatable occlusion balloon disposed on a portion of the elongate guidewire. The occlusion balloon may be a non-compliant or a semi-compliant occlusion balloon. The occlusion balloon may be inflated to occlude a bodily lumen prior to deployment of the prosthesis.