Visceral Manifold and Unitary Device Study for the Repair of Thoracoabdominal Aortic Aneurysms

Inclusion Criteria: * An aneurysm with a maximum diameter of ≥ 5.5 cm or 2 times the normal diameter just proximal to the aneurysm using orthogonal (i.e., perpendicular to the centerline) measurements * Aneurysm with a history of growth ≥ 0.5 cm in 6 months * Saccular aneurysm deemed at significant risk for rupture * Symptomatic aneurysm greater than or equal to 4.5 cm * Axillary or brachial and iliac or femoral access vessel morphology that is compatible with vascular access techniques, devices or accessories, with or without use of a surgical conduit * Proximal landing zone for the thoracic bifurcation stent graft: •≥ 2.5 cm of nonaneurysmal aortic segment including previously placed graft material (neck) distal to the left subclavian artery (LSA) * Diameter in the range of 26-42 mm * Adequate distance from the celiac artery, in order to accommodate cannulation from the antegrade access point when considering the total deployed length of the thoracic bifurcation and visceral manifold * Proximal landing zone for the unitary manifold stent graft: * Nonaneurysmal aortic segment including previously placed graft material (neck) with a minimum seal zone length of 3 cm * Diameter in the range of 19-32 mm * Iliac artery or aortic distal fixation site greater than or equal to 15 mm in length and diameter in the range of 8 - 25 mm * Age: ≥ 18 years old * Life expectancy: \> 1 year Exclusion Criteria: General exclusion * Patient is a good candidate for and elects for …