The catheter is left in place to avoid urinary retention due to difficulty in urination, to prevent infection caused by the retrograde flow of urine, and to prevent the need for catheterization in cases where the patient cannot take care of himself. Long-term indwelling catheters are harmful and may increase the risk of urinary tract infection. Frequent replacement of catheters may lead to urethral injury, urethral skin fistula, urethral stricture, bladder atrophy, etc. during the catheterization process. The use of catheters is generally avoided and the duration of indwelling catheterization needs to be minimized as a last resort. The catheterization process needs to be strictly aseptic and gentle to avoid causing urethral breakage. Postoperative care is needed to pay attention to perineal cleanliness and hygiene, washing every morning and evening, and switching on and off the urinary bag regularly when the bladder is full. Prophylactic use of antibiotics.