Intermittent catheterization is the safest method of bladder drainage for patients with controllable urethroplasty after total cystectomy, patients with enlarged neurogenic bladder and patients with neurogenic hypercompliant bladder. The specific operation is as follows: 1. Usually catheterize once at 4-hour intervals, keeping the urinary volume between 300-500 ml each time. Patients should drink more water at the same time to maintain a certain amount of urine to help prevent infection. You can catheterize once every night before going to bed and once in the morning after waking up. 2.The specific method is to wash and dry the required items for catheterization. 16F or 18F urinary catheter is generally used, and the catheter is dipped in a little paraffin oil and inserted into the urethra until 1-2 cm after urine flows out from the urinary catheter, and the catheter is removed after the urine is released. 3, this clean catheterization can lead to bacteriuria, but in the premise of 4 hours catheterization once, the bacteria in the bladder due to continuous dilution and not enough to occur can destroy the mucosa of bacterial infection, the incidence of asymptomatic bacteriuria is about 74%, and with high fever or pyelonephritis is rare. 4, home cleaning intermittent catheterization if you find foul-smelling urine, obvious turbidity, lower abdominal cramps, fever and back pain and symptoms of urgency, suggesting the possible existence of cystitis or urinary tract infection. Mild cases can be relieved by shortening the catheterization time and drinking more water, while those with severe symptoms should take oral antimicrobials for 3 to 5 days. If you have high fever, you should promptly guide the hospital to see a doctor, intravenous drip antimicrobial, and at the same time leave a urinary catheter through the urethra or stoma until the symptoms disappear or the body temperature is normal 3 to 5 days later. 5, using their own clean intermittent catheterization patients every 1 to 3 months need to check the urine culture, once the infection occurs, you can according to the results of the last urine culture first antimicrobial therapy, while timely urine culture examination. 6.It is difficult to estimate the amount of urine stored in the bladder when intermittent catheterization is just started, so it is a gradual training process for patients to master the time and amount of catheterization, and after a period of training, patients can generally master certain rules of catheterization. 7.Self-cleaning intermittent catheterization has certain comorbidities, such as urethral injury and urinary tract infection, but it is safer and more reliable compared with indwelling urinary catheter. 8.The significance of home-cleaning catheterization is that the patient can return to society, self-care and independent life after mastering this catheterization technique.