Method:Ten pumps were divided into two groups ,Polystan peristalic pump was group A (n=5)and COBE pump was group B(n=5). Ten whole blood samples(400ml) were circled in the roller pump for 16h.

• 方法 :采用两种滚压泵Polystan小儿泵 (A组 )和COBE泵 (B组 )分两组 ,作 5对 16h离体转流实验。