这需要在脖子处切割一个小切口，如此导尿管就能被传送给冠动脉。
This involves a small incision being made in the neck, so that a catheter can be fed down towards the coronary arteries.
切割气体既要保证等离子射流的形成，又要保证去除切口中的熔融金属和氧化物。
Cutting gas is to ensure that the formation of plasma jet, and to ensure that remove the molten metal oxides and incision.
等离子切割，由于融口上面大，下面小，切口断面总有一定斜度，不可能象火焰切割一样垂直，这是一世界性难题。
Plasma cutting, due to melt, the small mouth above, there is always a downward section incision, don't like probably as vertical flame cutting, this is a worldwide problem.
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