原因：穿刺针头贴于血管壁或采血管内无负压。措施：在保 证静脉穿刺成功的前提下，调节针头方向至血液流入 ...
2020.03.23
1、选择适宜的笔式双向采血针，双手握住笔式针两端的针套朝反方向拧开，去除一端的白色针套（带胶套的一端 ...
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