Once the aortic stent grafts are deployed, the branches are then created. Wires and catheters are used to cross through the reinforced fenestrations into the target visceral arteries. Covered stents are then deployed to extend from the modified aortic graft to the target vessel. The branch stents must create a hemostatic seal with the main endograft as these branches will be constructed within the aneurysm sac. Single or multiple stents may be required for any given branch.