方法（1）改良注入穿刺（EV）针与经皮肝穿刺胆道置管引流（PTCD）套管针在纯水和抗凝猪血中引流速度的比较。
Methods (1)To compare the drainage speed of the improved EV needle and percutaneous transhepatic catheterizde drainage(PTCD) case needle in water and anti coagulation pigs blood.
方法（1）改良注入穿刺（EV）针与经皮肝穿刺胆道置管引流（PTCD）套管针在纯水和抗凝猪血中引流速度的比较。
Methods (1)To compare the drainage speed of the improved EV needle and percutaneous transhepatic catheterizde drainage(PTCD) case needle in water and anti coagulation pigs blood.
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