Cerebral stent

Abstract

Implantable endoluminal prosthesis (1) 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 by wires; 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 crosssection and a constant diameter; characterized in that, the different layers of the plurality of layers have different surface coverage ratio, the ratio of the surface coverage ratio of the outer layer to the surface coverage ratio of the inner layer being at least 1.5.