Inclusion Criteria:  -Patients presenting with an acute (up to two weeks from the onset) and subacute (between 3 and 12 weeks from the onset) type B dissection with a proximal suitable non-dissected landing zone in the aortic arch or descending thoracic aorta (supra-aortic trunks debranching may be employed to obtain an adequate proximal landing zone  Exclusion Criteria:  Anatomy requiring sealing in the distal descending thoracic aorta may not be appropriate for a 50 cm sheath due to the risk of it being too short and the graft not reaching the intended landing zone; Celiac trunk or superior mesenteric branch design that makes the graft excessively long; Inability or refusal to give informed consent; Simultaneously participating in another investigative device or drug study; Frank rupture; Systemic infection (eg, sepsis); Allergy to stainless steel, polyester, solder (tin, silver), polypropylene, nitinol, or gold; Untreatable reaction to contrast, which, in the opinion of the investigator, cannot be adequately premedicated.