Used in the minimally invasive treatment of pathologies of the thoracic aorta, the ZENITH ALPHA thoracic stent is indicated for the treatment of patients with lesions isolated from the descending aortathoracic (excluding dissections), whose vascular anatomical configuration is suitable for endovascular repair, including: anatomical iliac / femorala adequate for access with the required introduction systems non-aneurysmal aortic segments (fixation sites) proximal and distal with respect to the thoracic lesion: with a minimum length of 20mm, and with a mean external wall diameter exterior wall not exceeding 42mm and not less than 15mm.