Vascular occluders; surgical instruments and apparatus for medical, or veterinary use, namely, occluders and plugs for use in cardiovascular surgery or interventions, vascular surgery or interventions and intravascular surgery or interventions; medical devices for implanting vascular and cardiovascular implants composed of artificial materials, occluders, vascular and cardiovascular devices for treating congestive heart failure; medical apparatus and instruments, namely, occluders and vascular and cardiovascular plugs; medical devices for use in interventional procedures, namely, implantable devices which are particularly well-suited for delivery through a catheter for implantation in a patient's heart, vessels or other places in a patient's body, namely, occluders, vascular and cardiovascular plugs, all of the aforementioned consisting of artificial and/or natural, non-living materials