Precautions for catheter removal: 1. Patients should be informed of the catheter removal operation before the catheter is removed. Patients should be instructed to relax in order to avoid excessive tension or strong muscle contraction, which may lead to difficulties in catheter removal.2. During catheter removal, the balloon in the catheter should first be extracted cleanly. Usually sterile saline is usually used to inject the balloon. The amount of injected balloon is about 10-15ml, but in the process of extracting the balloon liquid, it needs to be extracted as much as possible until it is impossible to extract the liquid mainly, otherwise it may cause difficulty in extraction because the balloon is not exhausted. 3.If during the extraction process, the patient has acute pain or bleeding, etc., stop the operation immediately and ask the urologist to perform the extraction operation. Sometimes the catheter can form stones on the surface and cause acute pain and bleeding due to the stones stinging the mucosa of the urethra in the urethra.