The catheter should not be used for a long period of time, and should be replaced regularly in order to avoid the occurrence of stones, local bacterial infections, catheter obstruction and other uncomfortable symptoms. 1. A catheter left in the body for a long time without replacement will cause stones to appear at the end of the catheter, resulting in patients being unable to pull out the catheter phenomenon occurs, but also lead to catheter obstruction, local bacterial infections, etc., so it is not for long-term use. 2. The catheter is mainly used to drain urine from the patient, and can be used to treat symptoms such as prostate hyperplasia and neurogenic bladder, which can relieve urinary retention. 3. If patients with urinary tract diseases need to use catheters for a long time, it is recommended that patients go to the hospital regularly for 2 to 3 weeks to change the catheter in time, so as not to lead to obstruction of the catheter and local bacterial infections in the patient, and if there is any discomfort, it should be informed to the doctor in a timely manner, so as to avoid delaying the treatment.