Underarm retention needles can be sterilized with iodophor and alcohol. The needle reserved in the armpit is an intravenous indwelling needle, which is used for infusion and injection of medication, and can avoid the tedious procedure of having to inject the needle again every time an infusion is given. Sterilization of the IV needle is much the same as the sterilization process for ordinary wounds, which involves disinfecting the patient with disinfectants such as iodophor, alcohol, tincture of iodine, and so on. After the patient is in a comfortable position, the clothing is undone to expose the location of the indwelling needle, and then disinfected with a cotton ball dipped in a disinfectant, which can be iodophor, alcohol, etc. Generally speaking, disinfection needs to be eliminated three times, and when disinfecting, take the reserved needle as the center of the circle, and disinfect from the inside to the outside. After disinfection is completed, put on your clothes and pack up your belongings.