Typically patients after ureteral lithotripsy with flexible scopes will carry a urine bag for about a day before it can be removed. On the one hand, because of the process of ureteral lithotripsy and lithotripsy surgery, with the movement of the ureteroscope needs to be constantly filled with water, so in the postoperative patients in the urinary system still part of the fluid, and one day after the operation of the patient often need to be bedridden and in bed activities, so you need to carry one day of the urinary catheter. On the other hand, lithotripsy is an invasive treatment, and during the procedure it is inevitable that the urethral mucosa will be rubbed, resulting in bleeding, etc. The use of a urinary bag can be observed to see if there is any postoperative bleeding, and it can usually be removed after one day of observation.