This technique is applied to patient who had pulmonary valve replacement in infancy higher alone or within a conduit.
Biological valves after 10-20 years degenerate becoming stenotic or insufficient. Because they are inserted in young patients, these patients will need more then one or two operations during their life. Percutaneous pulmonary valve replacement became a very good option for these patients. 
The valve is inserted trough the femoral vein into the right atrium, right ventricle and pulmonary artery. Before positioning the valve often a stent is positioned into the pulmonary artery or conduit in order to allow a better anchoring of the valve in the proper position. 
 Larger valves (p.e.) being available and we started to treat also patient with important pulmonary insufficiency after radical repair of  Fallot Tetralogy with a very good results.