The elderly perennial insertion of urinary catheter is generally to need to be replaced once a month. If the elderly indwelling catheterization, it is recommended that regular replacement, and urine bags need to be replaced once a week, of course, due to the different materials of the urinary catheter, urine bags, so the frequency of replacement will also be different. For safety reasons and to prevent bacterial growth, urinary catheters need to be replaced once a month in clinical practice, but this needs to be analyzed according to the clinical situation. Some elderly people are unable to do monthly replacement due to mobility problems and personal conditions, so they may consider replacing the urinary catheter with an antibacterial coating, which can be replaced once every two months. Urinary catheter replacement time is not fixed, the elderly often use urinary catheter, need to do a good job of urinary catheter care, can use iodine povidone to scrub the external urethral orifice every day, to prevent bacterial growth, the specific status of the replacement can consult a professional doctor.