If it falls out after 2-3 weeks, you can replace the cystoscope (at the same time, take out the original one and replace the other). The operation is simple and should be replaced as soon as possible;
This problem has nothing to do with pipe and operation. The ends of DJ tube are curled, which may be that the ureter has a certain probability of falling out after peristalsis. I met 2/3 in half a year, and the probability is not low. I wish you good health!