The present invention refers to an implantable endoluminal prosthesis for use in the treatment of aneurysm involving branches having a multilayer configuration, comprising at least one self-expandable braided framework extending along an axis able to expand from a radially compressed state in a delivery configuration to a radially expanded state； the self-expandable braided framework being formed with at most 196 wires having a given wire diameter (Ø21)； this self-expandable braided framework devoid of any impermeable cover layer, comprising a plurality of layers of wires made of biocompatible material； and forming a wall of the endoluminal prosthesis； each layer forming a mesh； the meshes forming a lattice with a plurality of wires of said layers； the meshes being interlocked, the wires being integrated in the mesh of at least one of the adjacent layers； the self-expandable braided framework comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter； characterized in that, in radially expanded state, a ratio (T1/Ø21) of thickness (T1) of a wall of the implantable endoluminal prosthesis in radially expanded state to the diameter (Ø21) of wire (21) being greater than 3.0； and the surface coverage ratio (SCR) of said braided framework is at least 30% and at most 50%.
