The catheter can be left on at all times. The purpose of catheterization is usually to relieve urinary retention, monitor urine output, and perform urinalysis. Most patients will not keep the catheter for longer than 1 week, and those longer than 1 week are mostly patients with bladder dysfunction that cannot be recovered, critically ill patients, urethral injuries, and patients who are confused, and at this time, professional doctors need to decide the opening and closing time of the catheter. If you need to keep the urinary catheter for a long time, it is recommended that the replacement time should not exceed one month, usually pay attention to keep the urinary catheter open, avoid pulling, folding, blocking, etc. During the period of indwelling urinary catheter, encourage the patient to drink more water appropriately, and usually the urinary catheter can be open all the time to fully drain. Observe the change of urine volume and color, and come to the hospital for review if there is any abnormality. If you want to keep the catheter, please visit regular hospitals and have it done by professional medical staff.