s a process in which the opening of the thoracic wall to perform surgery in the muscles of the heart or valves or arteries, where the surgeon cut the bone shear or the upper part of it, and once access to the heart is put an artificial heart - lung to replace the heart and the function of pumping blood to All parts of the body, and this device allows the surgeon to perform the operation in the heart, which stops working and does not flow blood through it