Male urinary catheter is often fixed with a gas bag, supplemented by adhesive tape fixed on the edge of the bed, inner thighs or lower abdomen, etc.. For catheters with air bladder, when inserting the catheter, after the catheter is inserted into the bladder to a certain depth, about 20ml of saline is injected into the air bladder, which can make the air bladder open up, and can make the catheter fixed. In addition, the catheter is fixed with adhesive tape to the edge of the bed, inner thighs or lower abdomen to prevent it from falling off when moving. Patients who require an indwelling catheter will need to receive a urine bag and hang it to the edge of the bed. When moving around after the catheter is fixed, care needs to be taken at all times to avoid accidentally pulling the catheter, resulting in urethral injury. At the same time, be careful not to bend the catheter, so as to avoid urine reflux, easy to cause urinary tract infection. The indwelling of the catheter needs to be operated by a specialized physician.