皮下注射针是一种可以直接插入人体皮肤的医疗器械[1]，它其实是一个非常细的空心管，并且通常要安装在注射器上，医务人员通过注射器以及皮下注射针将药物（生理盐水）注射到人体内，医务人员也通过注射器以及皮下注射针从人体内采集液体（血液）。
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