A intravascular devices for treating cerebral aneurysms, the device comprises a controllable expansion member from the outside, extension member includes a plurality of wires that define a wall of the expansion member, relaxed state of the expansion member in the wall has an opening defined between the wires, a coil positioned within the aneurysm a sufficiently small at least the first wall portion to prevent the exit from the aneurysm, at least aneurysm having an axial length which is about the same length as the neck, and the first wall portion, an aperture defined between the wires, to allow the passage of blood flow large enough at least a second wall portion a is, aligned axially relative to the first wall portion comprises a second wall portion, the intravascular device. In some embodiments, the openings of the first wall portion is sufficiently small to reduce the radial blood flow and / or from aneurysms of the aneurysm.