Bi-joint tubes can be used by pregnant women. Double-jointed tubes are also called ureteral stent tubes. If a pregnant woman is unable to undergo surgery due to hydronephrosis caused by stones in the course of pregnancy, she can place a ureteral stent tube for drainage, which can well relieve the symptoms of hydronephrosis, and then the ureteral stent tube can be pulled out after the delivery, and then the treatment of the kidney stones can be carried out again. Ureteral stent tube is a common method for treating hydronephrosis due to urinary tract obstruction, which is relatively simple, the material is non-toxic, the infection rate is relatively low, and it is easy to remove. It is recommended to drink plenty of water after placing the ureteral stent to reduce the chance of infection. After placing the ureteral stent tube, you should avoid a lot of exercise to reduce the increase of abdominal pressure, and eat more crude fiber food, such as celery, dragon fruit and so on, to avoid constipation. If you experience any discomfort after ureteral stenting, it is recommended that you seek medical attention promptly.