After inserting the ureter to push the stone into the bladder, it is best not to pull it out immediately, so as not to cause urine backflow induced pyelonephritis and other adverse consequences. Generally, ureteral stones are large enough to require ureteroscopic lithotripsy, after which a urinary catheter is usually inserted to support the ureter to facilitate the evacuation of urine, to prevent backflow of urine in the bladder, and to help the remaining stones after lithotripsy to be discharged. It is recommended that the ureter be removed about 48 to 72 hours after surgery. If the urinary catheter is removed immediately after the stone is pushed into the bladder, the urine will not be able to empty properly, leading to pyelonephritis and ureteral stenosis due to the inability of the stone to be discharged. After the removal of the urinary catheter, you should drink more water to empty the bladder in time, do not hold urine. In conclusion, it is not recommended to remove the ureter immediately, it is recommended that the doctor arrange the removal, and at the same time, if you have the urge to urinate, empty the bladder in time, do not hold urine, and regular checkups.