The time for bi-diode removal is usually about one month after surgery. Ureteral stent tube, also known as bi-diode, belongs to soft and highly elastic material, which is mainly used in urology surgery for ureteral stones, kidney stones, hydrocele and other surgeries for preventing adhesion or ureteral stenosis, and plays the role of drainage of urine and dilation of ureter, which should not be retained in the body for a long time, so as to avoid infection, causing lumbar pain, urinary frequency, urgency, and so on. If the patient’s postoperative symptoms are good, the general time for the removal of the bi-polar tube is about one month after the operation, insert the bi-polar tube into the bladder through the cystoscope to confirm the position, and then clip the bi-polar tube and pull it out of the bladder, after the bi-polar tube is pulled out, it is necessary to carry on drinking more water to prevent the urinary tract from infecting, and if there is lumbar pain and hydronephrosis, it should be taken to the hospital in time to get medical treatment. The best time to take out the bi-diode is usually about one month after the operation, but it should be taken out according to the patient’s own situation and under the regular guidance of the doctor.