Endovascular device with membrane

endovascular device (10) for introduction into a body vessel to treat an affected, damaged or weakened wall of the vessel, the endovascular device comprising part: a mechanically expandable expandable device (11) from a first position to a second position, expanding said expandable device mechanically radially outward to the second position so that the circumferential surface of said mechanically expandable device contacts the inner surface of the vessel to maintain a fluid passage through said vessel; and a membrane (20) covering at least part of the circumferential surface of said mechanically expandable device; wherein the membrane has a porosity equidistant and pore sizes (25) of about 1 to 40 microns, dimensions (22) bridge about 10 to 100 .mu.m and a material ratio, which is the ratio of coverage material the total surface area of ​​the membrane, from 75% to 100%; and wherein the membrane is made of a highly biocompatible elastomeric polymer, the polymer being a polyurethane based endgroups with material.