连续流动离心：用两根静脉导管。
间歇流动离心：需要一根静脉导管。典型地，一次去除300毫升血液，离心使血浆与血细胞分离开来。
Discontinuous flow centrifugation: One venous catheter line is required. Typically, a 300 ml batch of blood is removed at a time and centrifuged to separate plasma from blood cells.
一根细金属丝从静脉里穿到心脏。
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