At the edge of the hospital bed. Drainage bag refers to a commonly used disposable drainage bag (urine bag). It is mainly used with a urinary catheter for patients to collect and store urine. It can also be used to collect drainage fluid and is not easily accessible when placed along the side of the bed. It is also helpful for medical staff to observe if they are touched or squeezed. The drainage device needs to be observed at all times when extracting waste liquid in ordinary wards. When the bag is full, it needs to be cleaned in time to avoid backflow contamination.