After minimally invasive surgery for urinary tract stones, a stent tube needs to be placed in the ureter for support and drainage. Surgery can cause local damage to the ureteral mucosa, which can result in local scarring or ureteral stenosis during the repair process. The placement of a ureteral stent tube can support the area and prevent stenosis and excessive scarring from causing ureteral obstruction during the healing process, which will help the ureter recover after surgery. After surgery, the ureter will have varying degrees of edema, and the edema of the wall will cause narrowing of the lumen, resulting in poor drainage of urine from the kidneys or postoperative symptoms of hydronephrosis, back pain and fever. After the ureteral bronchus is left in place, the water from the kidney can be drained to the bladder, so that acute hydronephrosis, renal colic and pelvic infection will not occur, so a ureteral stent tube is routinely placed after surgery.