Closed System Transfer Device 1. Fully closed transfer for dangerous drugs (anti-tumor drugs, hormones, cytotoxic drugs). 2. Possible hazards of occupational exposure to dangerous drugs: harm to the female reproductive system (irregular menstruation, infertility, miscarriage during pregnancy or fetal congenital malformation), carcinogenesis, etc. 3. Avoid the leakage of dangerous drugs or aerosol, and to the greatest extent protects medical workers.