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1·Using 22g or 24g intravenous catheter needle. Choose non-operated side in patients with median cubital vein, forearm vein and forearm blood vessels in your vein for the injection.

采用22g或24g静脉留置针，选择患者非手术侧肘正中静脉、前臂静脉和前臂贵要静脉为注射血管。