This is an intravascular prothesis deliverable percutaneously with several cardiac applications including but not limited to heart valves, intravascular narrowings and cardiac defect occlusion. The device has a detachable sac connected through a thread or wire outside the body where it is immobilized. The device can remain inside the heart for as long as it is clinically useful in non permanent applications (valve, throttle); at any point it can be retrieved by pulling it outside the body by the holding wire/thread. In permanent applications (defect occlusion) the wire/thread can be withdrawn allowing the sac to endothelialize.