A vascular endoprosthetic device (200) configured for placement inside the aortic arch, in particular for treating aneurysms and/or dissections, which device (200) has a tubular structure and a construction allowing a modular insertion and deployment, which device (200) comprises: - a distal component (201) configured to be placed in the distal part of the aortic arch or in the descending thoracic aorta, which distal component (201) has a main body portion (210) with an internal lumen and comprises a first and a second docking branches (231, 232) housed inside said lumen at a proximal end part thereof, which first and second docking branches (231, 232) are integral to, or fixed to with, said main body portion (210) - a first proximal component (230), configured to be placed in the innominate artery - a second proximal component (202), configured to be placed in the ascending aorta, wherein said distal (201), first proximal (230) and second proximal (202) components are provided as distinct elements and are apt to be assembled in the aortic arch during an insertion and deployment procedure, wherein each of said first (211) and second (202) proximal components has a respective proximal portion (212, 222) and a respective distal portion (211, 221), such distal portion (211, 221) having a reduced cross-section with respect to the respective proximal portion (212, 222), wherein each of said distal portions (211, 221) of said first (230) and second (202) proximal components is configured so that, once the device (200) is deployed in situ, such distal portion is received in a respective first (231) or second (232) docking branch of said distal component (201), so that said docking branch (231, 232) acts as a docking site for the respective first (230) or second (202) proximal component, wherein said second proximal component (202) has a diameter configured to accommodate the whole cardiac output, and wherein the endoprosthetic device is configured so that, once deployed in
