Abdominal Aortic Aneurysm (AAA) Clinical Trials

Experimental: Complex Abdominal (CAAA) and Thoracoabdominal Aortic Aneurysm (TAAA) Arm

The CAAA and TAAA study arm will include 700 patients treated by endovascular aortic repair of CAAAs and TAAAs (Extent I to IV) using either an off-the-shelf Zenith t-Branch or patient-specific stent-graft with a combination of fenestrations and/or branches, with or without concomitant unilateral or bilateral iliac artery aneurysms treated by iliac branch devices. The graft includes 1 to 5 small holes (fenestrations) or cuffs (side branches). These small holes or branches are the investigational part of this research study. The arteries to the liver, intestine, and kidneys will have a stent (small tubular stainless steel structures) to help keep the arteries open and aligned with the fenestrations or branches.

Experimental: Aortic Arch Aneurysm Arm

Aortic Arch study arm will include 60 patients with aortic arch aneurysms treated by patient-specific stent-grafts with one to three inner branches or a scallop.~The study will include patients with CAAAs, TAAAs and/or aortic arch aneurysms due to degenerative aneurysms or chronic aortic dissections. The stent-graft design for this study will be individually selected based on anatomy at the discretion of the principal investigator.