The Cocoon PFO Occluder is a percutaneous transcatheter closure device intended for the occlusion of all types of PFO's i.e. classical as well as those with aneurysm of the septum, in patients with a history of stroke or transient ischemic attacks (TIAs) diagnosed by echo-cardiography with right to left shunting during Valsalva procedure. The Cocoon PFO Occluder is a self expandable double disk device made from a Nitinol wire mesh coated with Platinum. The two discs are linked together by a short connecting waist allowing free motion of each disc. In order to increase the closing ability, the discs are filled with polypropylene fabric. The fabric is securely sewn to each disc by a polyster thread.