冠状物

例句：

1. 1. The patient needed a stent to open up his blocked artery.
   病人需要支架来打开他阻塞的动脉。
2. 2. The stent graft was inserted into the artery to prevent further blockage.
   支架被插入到动脉中以防止进一步阻塞。
3. 3. The stent graft was removed after the procedure, leaving the artery unblocked.
   在手术之后，支架被移除，使得动脉不再阻塞。