Atrial septal defect sealing is an effective treatment for atrial septal defects in congenital heart disease. With the application of ultrasound monitoring of the esophagus in thoracic surgery, avoiding the X-ray exposure of traditional interventional procedures, the blocking umbrella is delivered into the atrium through femoral vein puncture to seal the atrial septal defect, blocking the left-to-right shunt at the atrial level and restoring the normal blood circulation pathway for treatment purposes. The main advantages of this procedure include rapid postoperative recovery, less painful surgery, smaller wounds, and lower chance of infection, making it the best method to effectively treat congenital atrial septal defects.