金属封堵器：植入1月后，封堵器表面开始有新生组织覆盖，但是金属丝还是清晰可见；

可降解封堵器：植入1周开始，封堵器表面开始就有新生组织覆盖，植入3月后封堵器框架已基本不可见，新生组织已基本覆盖整个封堵器（包括栓头和封头）

Metal occluder: 1 month after implantation, the surface of the occluder began to be covered with new tissue, but the metal wire was still visible;

Degradable occluder: 1 week after implantation, the surface of the occluder was covered with new tissue. Three months after implantation, the occluder frame was almost invisible, and the new tissue basically covered the whole occluder (including screw and tip).