One end of the ureteral stone retention tube is placed inside the kidney, the full length of which passes through the ureter, and the other end is left within the bladder, which is curved at both ends to enable it to be secured inside the body and does not usually flow out with the urine. After kidney surgery for ureteral stones, a ureteral stent tube (double-J tube, pigtail catheter) is left in the body, which is about 25 to 30 centimeters in length. The ureteral stent tube can be used to drain urine, prevent ureteral stenosis and adhesion and blockage, and prevent sharp back pain, difficulty in urination, or localized infections and edema due to congestion and edema of the mucous membranes after the surgery. Usually, the catheter should not be left in place for more than three months, otherwise the catheter may deteriorate, break easily, not easy to remove or produce stones. Generally, the catheter should be left in place for 4 to 6 weeks after surgery, and if long-term placement is necessary, it should be replaced every 2 to 3 months. After placing a ureteral stone indwelling tube, you should follow the doctor’s instructions and contact your doctor if there is any abnormality in order to avoid any adverse consequences.