The double J catheter can be removed and returned to normal in 1-2 days. The “double J catheter” is a drainage device commonly used in urologic surgery, with one section placed in the renal calyces and one section placed in the bladder. When the drainage tube is properly positioned, the catheter guidewire is withdrawn and both ends of the tube are bent, similar to a pig’s tail, which naturally hooks the tissue at both ends and fixes itself in the ureter, so the “double J catheter” is also called the “pig’s tail tube” and has the ability to expand the ureter and prevent the ureter from being damaged. Therefore, the “double J catheter”, also known as the “pig tail tube”, has the function of dilating the ureter and preventing ureteral adhesions and collapse. One month after the surgery, the catheter will be removed according to the patient’s recovery, and the catheter will be removed with the help of a ureteroscope, and the catheter will be removed under the mirror. In addition, after extubation, patients should pay attention to rest and drink more water to promote urine excretion and to promote the subsidence of symptoms.