1.What material is the blocking umbrella made of? The mesh structure of the blocking umbrella is made of nickel-titanium memory alloy anti-magnetic material with built-in multi-layer polyurethane film. It is safe and harmless to human body and has high tissue compatibility. 2.What is the effect? The treatment has the same effect as open heart surgery, but with less trauma and quicker recovery, and can be discharged in 3 to 5 days after surgery. 3.Is there any risk in blocking treatment? Compared with conventional open heart surgery, blocking treatment for precardiac disease is simple, less traumatic, less risky and safer. It is better for patients to choose large hospitals with cardiac surgery to be safer. 4.Is there any complication of blocking treatment? Patients who want to undergo blocking treatment are screened strictly and scientifically before surgery to decide whether to undergo blocking treatment or not, and patients who are not suitable for blocking treatment are treated by conventional surgery, so the complication rate is low. 5.Can the blocking umbrella stay in the body for life after surgery? The product is highly biocompatible and can be quickly covered by endothelial cells in the body, which is integrated with the surrounding tissues and can be retained in the body for life.