In the past, the cotton ball at the mouth of the infusion bottle was usually placed into the mouth of the infusion bottle using a sterile clip. Sterile clips are a tool used in medical environments to ensure sterility and safety, avoiding contamination and cross-infection. In medical operations, sterile clamps are often used to pick up sterile items or instruments and place them into corresponding containers or equipment to ensure the sterility and safety of the operation. Nowadays, some medical syringes are equipped with cotton ball tips, which are convenient to use.