Kidney stone surgery ureteral flexible mirror has some damage, mainly consider ureteral injury, infection, complications and other factors. 1. Ureteral injury: ureteral avulsion, thermal injury, perforation and so on may occur during the process of ureteroscopic sheath entering into the ureter, and in serious cases, ureteral fracture may also occur. 2. Infection: when performing flexible ureteroscopy, there may be retrograde infection due to the increased pressure in the kidney, which may cause severe infection with symptoms such as pus accumulation in the kidney and high fever. 3. Complications: mainly due to ureteral stenosis, usually double J tube needs to be kept after the operation to reduce the incidence of ureteral stenosis. Kidney stone soft lens surgery goes smoothly and operates appropriately, and generally does not cause damage to renal function. If you have any symptoms of physical discomfort, you should go to the hospital in time and consult your physician for guidance.