来自《耶鲁大学开放课程：生物医学工程探索 第25集 第25集》
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there are several different能用于这种用途的材料 -
materials that can be used in this way.还有好几种不同种类 -
Because the aorta is a large caliber vessel it stays patent,由于主动脉是的内径非常粗的血管 -
that is the blood can flow through continuously for many decades.血流能持续数十年不断流过 -
This is true for vessels对于直径超过五毫米的血管 -
that are larger than say 5 mm in diameter.这种方式无疑是非常好的 -
As the size goes down,而随着血管直径减小 -
it becomes more difficult应用人工血管取代正常血管 -
to use synthetic materials in these applications.会变得越来越困难 -
You can't use a synthetic你不能在 -
material like this in the coronary arteries,像心脏冠状动脉这样的血管上 -
for example, of the heart.用人工材料来代替