Atrial septal defect (ASD), ventricular septal defect (VSD) and patent ductus arteriosus (PDA) are all common congenital heart diseases, accounting for 7-10%, 20% and 9-12% of congenital heart diseases, respectively. The main pathophysiological changes are left-to-right shunts at the atrial level, ventricular level and aortic level respectively, resulting in increased pulmonary blood flow and clinical manifestations such as susceptibility to colds and pneumonia. If left untreated for a long time, it can affect growth and development in children, and can also develop bacterial endocarditis (common in VSD). In late stages, it can cause pulmonary hypertension, congestive heart failure and arrhythmias, and finally severe irreversible pulmonary hypertension, producing right-to-left shunts and cyanosis, clinically known as Eisenmenger syndrome. This results in the loss of surgical and therapeutic opportunities and threatens the patient’s life. Traditional treatment methods The current traditional methods of treating ASD, VSD and PDA are both surgical and medical interventions. Although both methods are effective in treating ASD, VSD and PDA, the former requires median or lateral chest opening and extracorporeal circulation, which is traumatic and requires a long operation time of 2-3 hours at the earliest, with severe postoperative pain, slow recovery, long hospital stay, and obvious skin scars that affect aesthetics. Although the latter does not need to open the chest, the trauma is small and the operation time takes 2 hours. Although the postoperative recovery is faster, the cost is expensive, the total cost is about 30-45,000 yuan, which is nearly 2 times of the surgical procedure, and during the treatment, the patient has to receive large doses of X-ray radiation, which is not good for health. A new technique for the treatment of ASD, VSD and PDA Transthoracic surgical minimally invasive occlusion is a new method for the treatment of ASD, VSD and PDA that has only recently emerged. This method does not require a median or lateral chest opening or extracorporeal circulation, but only a small incision of about 2-5 cm at the 4th intercostal space on the right edge of the sternum (ASD) or the lower median sternum (VSD) or the 2nd intercostal space on the left edge of the sternum (PDA), and a blocker is delivered transthoracically under ultrasound guidance to block the ASD or VSD or PDA. The advantages of this new method are: 1. The use of a short and straight delivery system instead of the thin and curved sheath of medical interventions is more conducive to manipulation, thus improving the accuracy and safety of the procedure; 2. It is suitable for children with thin blood vessels; 4. It does not require large open chest or extracorporeal circulation, which is less traumatic, less painful after surgery, faster recovery, and shorter hospital stay (3-5 days); 5. The location is low and does not affect the aesthetics, especially suitable for children and young women; 8, does not need to receive X-ray radiation; 9, compared with the first two methods, the cost is low, only a total of about 20-25 thousand yuan. Therefore, it is a good method that is safe, effective and economical. Postoperative precautions: 1. Heparin anticoagulation, 0.5mg/kg, is used during blocking surgery, and fisetin is not used to neutralize it after surgery; after that, oral aspirin anticoagulation is used instead, 25mg/day or 50mg/day for children according to their body weight, for six months. 2. Review echocardiogram and electrocardiogram are required for 3 months after blocking surgery, and avoid strenuous physical activities and strong physical labor for 1 month after surgery.