on the tip and the balloon is underneath this stent.

气囊就在支架的下面
So,once you've got it in place,

因此一旦导管到达目标位置
you blow up the balloon,

就要将气囊吹起
the stent becomes larger, it forces the blood vessel to become open.

支架就会变大撑开血管
Then you deflate the balloon,

然后抽空气囊
and because this is made of metal it doesn't deflate when the balloon deflates.

由于支架是金属的不会随气囊一起塌陷
It stays there inside your blood vessel,

扩张的支架就留在了血管内
holding the blood vessel open so now blood flow can continue.

支撑血管保持血流通畅
This is a very common medical therapy that's done

这已经是取代心脏旁路手术的
as an alternative to heart bypass.

一个很常规的治疗方案了
We'll talk about heart bypass operations in a few weeks.

几周后我们就会讨论到心脏旁路手术
Instead of having a new blood vessel put into your heart,

和在心脏上换一条新的血管那样的大手术