in conduits like this are Dacron,

一种是涤纶
which is a synthetic polymer that was first--

这种人工高分子材料一开始
was used for lots of things

现在它的应用很广泛
but it's made into clothing, for example.

但一开始是用于制衣领域的
Surgeons like it because

外科医生很喜欢这种材料
it has nice properties, you can sew it easily.

因为其性质优良容易缝合
Imagine that a material that's going to be used

大家想一下
in an application like this,

这种用途的材料
a surgeon has to be able to sew into it fairly readily.

得让外科医生进行可靠的缝合才行
It has to be able to hold a suture,

它得承受缝合的张力
and that suture line has to make a neat connection or anastomosis

同时缝合部位还必须和原来的血管
with the native vessel.

严丝合缝才行