Trauma patch, also called benzalkonium chloride patch, is a topical patch with benzalkonium chloride as the main active ingredient. Benzalkonium chloride is a cationic surfactant with a broad-spectrum bactericidal effect. The wound patch also has an elastic fabric that has a pressurizing and hemostatic effect. This drug is mainly used clinically for small traumas, abrasions and other skin breaks. This drug is a sterile product, and it is forbidden to touch the middle compound pad with fingers after unpacking, and if the package is found to be open or broken before use, the drug cannot be used at this time. In addition, attention should be paid to maintaining cleanliness and wound disinfection during use, and to keep the wound hygienic, it should be changed at least once a day. In conclusion, band-aids are mainly used for small wounds and abrasions with disinfection and sterilization effects.