What parts of the syringe must be kept sterile

According to the principle of sterility, the needle, piston, nipple, and stem of a syringe must be kept sterile.

A syringe consists of a needle and a syringe. The needle includes a needle tip, a needle stem, and a needle plug. The syringe includes a nipple, an empty barrel, a piston, a piston shaft, and a piston handle.

Currently, the commonly used specifications are 2 ml, 5 ml, 10 ml or 20 ml syringes, occasionally 50 ml or 100 ml syringes, and 1 ml syringes for intradermal injection.

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