Interventional treatment is currently the preferred treatment for arterial catheterization, but traditional surgical ligation is also performed at some municipal hospitals. The incidence of recanalization/residual division after arterial catheterization ligation is currently very low, and secondary ligation can be performed after early detection. If the recanalization is found late and the fibrosis around the tissue is severe, secondary ligation is not advisable, and surgical operation requires open-chest extracorporeal circulation with suture closure, which is traumatic and unacceptable to patients. Currently, interventional occlusion is still the preferred treatment for recanalization/residual shunt after arterial catheterization ligation. The method of interventional occlusion and the choice of the occluder follow the conventional interventional occlusion technique, which requires an individualized treatment plan. Postoperative management and follow-up are the same as conventional. Surgical difficulties: 1. The operator should be skilled in interventional techniques, because the channel formed by recanalization is irregular and distorted, and the guiding wire is not easy to pass, which makes it difficult to establish the track. According to the shape and size of the recanalization, the appropriate blocker should be selected. 3.The area around the recanalization is often fibrotic or calcified, so the operation should be cautious and avoid violence. Interventional treatment of recanalization/residual shunt after ligation of unclosed arterial catheter requires no secondary chest opening, no blood loss, and little chance of infection, which can significantly shorten the hospital stay, reduce medical costs, and lower medical risks. The patient’s pain is minimal, easy to be accepted by the patient and the doctor, and the efficacy is definite and the advantages are obvious, so it is the preferred method of treatment. A typical case is shown in Figures 1, 2 and 3. Figure 1: Severe calcification of the surrounding tissues after PDA ligation is seen under fluoroscopy Figure 2. Aortic arch descending angiogram shows residual shunt of PDA with distorted and irregular channels Figure 3. Post-blocking angiogram shows satisfactory shape of blocker and no residual shunt