The drainage bag has the function of external catheterization. Because some patients with the urinary system are unable to urinate normally on their own, and some patients have difficulty moving after surgery, they need to insert a urethral tube and connect an external drainage bag. In this way, the patient does not need to urinate frequently. Bed urination can solve physiological needs directly on the hospital bed.
In addition, it can also be used to collect residual blood pressure from wound drainage tubes, etc., which has many functions.