Flexible lens surgery refers to ureteral flexible lens lithotripsy, this surgery generally does not cause permanent damage to the kidney, because through the flexible lens is through the natural lumen of the human body for the surgical method, but there may be complications, such as bleeding, infection, ureteral damage and so on. 1. Bleeding: carnal hematuria may occur after the operation, usually the color of urine turns clear within 1~3 days, and no special treatment is needed. If the bleeding is not relieved, or there is a tendency to aggravate, under the guidance of the doctor to apply antiemetic drugs, and at the same time to identify the cause of bleeding, if necessary, need to carry out interventional therapy, generally can be cured. 2. Infection: If the patient’s surgical area is infected, due to bacterial dissemination can cause urinary tract infection, infection may occur, can closely observe the temperature change, can apply antibiotics, drink more water, generally can prevent or control infection. 3. Ureteral injury: when placing the ureteral sheath, it is possible to cause damage to the ureteral mucosa, or even cause ureteral avulsion, postoperative ureteral stenosis and so on. All surgeries have certain risks, and ureteral lithotripsy is no exception. However, ureteral lithotripsy has been carried out for many years in clinical practice, and it is a relatively mature surgery with relatively small risks, so if you have urinary stones, please consult a regular hospital. After the operation, please follow the precautions given by the doctor to minimize the occurrence of complications.