Method:all 1 ml dispensable syringes of 6 batch numbers of 5 different brand names were collected and divided into 6 groups. 30 syringes were selected randomly from each group and dead space capacity and drug fluids remnants of which were detected.

• [方法 ]收集 5种品牌 6种批号的一次性1ml注射器 ,分成 6组 ,每组随机抽取注射器各 3 0支 ,测定其死腔容量及残余药量。