If a female catheter is left in place for a long period of time, the maximum time should not exceed 4 weeks. After 4 weeks, the catheter may become clogged, aged, or not open, or the air sac of the catheter may rupture naturally and the catheter may come out, or the catheter may be left in place for a long period of time and crystals may be deposited on the catheter or infection may occur. Therefore, in principle, it is recommended that the catheter be changed within 2-4 weeks, at most 4 weeks. In addition, it is necessary to take good care of the catheter in daily life, such as disinfecting the urethral opening regularly, drinking more water, urinating more often or intermittent bladder flushing to prevent urinary tract infections and maintaining the cleanliness of the catheter. If the catheter is blocked, unclear, cloudy urine, flocculent sediment or urethral swelling, pain or increased secretion during catheterization, the catheter needs to be changed at any time and the drainage bag needs to be changed every week during the routine wearing of the catheter.