The length of time a catheter is left in place depends on the material of the catheter. If it is a rubber catheter, it can be left in place for about a week; if it is a silicone catheter, it can be left in place for a month. In addition, the duration of the catheter needs to depend on what kind of disease the patient is suffering from. If it is prostate enlargement and bladder bleeding, it can be left in for a week, and the catheter needs to be removed after the symptoms are relieved. If the catheter is left in place for a longer period of time, it may cause a urinary tract infection, so try to remove the catheter within a week. However, if the patient is not able to move around or cannot urinate in bed, or cannot urinate on their own due to neurological disorders, the catheter needs to be inserted for a long period of time, and the catheter should be changed at least once a month in such patients. During this period, it is also necessary to observe whether the urine in the catheter is clear, with or without flocculation and bleeding. If any of these conditions are present, bladder irrigation is needed, which can be done once a day with 500 ml of saline, and the catheter can be changed at any time if necessary.