A persistent ductus arteriosus was occluded with an ivalon-plug introduced through the femoral artery in 14 patients over 60 years old (61 to 70 years). Two patients had previous surgery. The maximum left-to-right shunt was 53%, the maximum pulmonary artery pressure 54/24 mm Hg. In all patients ductus occlusion was successful and permanent. Bleeding at the puncture site in two patients could be stopped by manual compression. During a follow-up period of up to 5 years there were no instances of recanalization.