Extracorporeal Shock Wave Lithotripsy (ESWL) for ureteral calculi takes about 15 minutes, and is performed through a specialized ESWL machine to locate the stone and crush it with various energies. After lithotripsy, the patient can go home on his/her own, and take oral lithotripsy medication to assist him/her to drink more water and urinate more often, and most of the stones can be discharged by himself/herself in about 1-2 weeks. However, if the stone size is large or the hardness of the stone is high, it is possible that after several times of extracorporeal shock wave lithotripsy, the stone still can not be discharged, and even need to carry out surgical lithotripsy to remove the stone if necessary. Therefore, it is recommended to go to the hospital for relevant examinations, such as ureteral CT examination, through the CT value to initially determine the density of the stone, and speculate on the time of possible lithotripsy after the expulsion of the stone. If the CT value of ureteral stone is less than 900, it can be discharged in about 1-2 weeks through extracorporeal shock wave lithotripsy. However, if the CT value of the stone is more than 900, it suggests that the stone is hard, and it needs to be repeated lithotripsy several times or directly undergo surgery to retrieve the stone.