A drainage bag is a medical device used to collect and drain fluid from the body. The principle is to drain the fluid through the drainage tube into the drainage bag, and then through gravity or negative pressure out of the body. The inside of the drainage bag is usually equipped with a valve or opening for medical personnel to check and clean. Drainage bags are usually used for drainage after surgery, trauma, pleural effusion and other situations, which can effectively reduce the occurrence of infection and other complications. Different types of drainage bags are suitable for fluid drainage in different parts, such as chest drainage bag, abdominal drainage bag, urine drainage bag, etc.

There are many kinds of drainage bags, common urine bags, stomach tube bags, bile duct bags and so on. Urine bags are usually used to collect urine, gastric tube bags are used to collect gastric fluid, and bile duct bags are used to collect bile. The use and installation methods of the drainage bag are also different, and need to be selected and operated according to the specific situation. The material of the drainage bag is generally medical polyurethane or polyethylene material, which has good durability and reliability. The drainage bag should be cleaned and disinfected in time after use to avoid infection and other complications.