Scope and Contents Shows an artificial heart in operation on pump as well as an artificial ventricle, a real ventricle, and a Teflon ventricle with the valves opening and closing. This film also shows Atrioventricular window patches 8-21 days. These include two silastic, one polyurethane smooth, two knitted Teflon, two collagen, and one polyurethane sponge. In closing, they show a monocusp valve.