The method of indwelling catheterization is to insert a urinary catheter into the patient’s bladder and leave it in the patient for a continuous period of time, which is determined by the product material. Intermittent catheterization, on the other hand, is not inserted into the patient for a long period of time, but is intermittently inserted into the patient’s bladder via a urinary catheter, and the catheter is removed immediately after the completion of the catheterization work, while among the mainstream catheterization techniques, clean intermittent home catheterization is the dominant form of care. Clean intermittent home catheterization was first advocated as early as 1972 by Lapides, an American professor treating patients with neurogenic bladder such as spinal cord injury. Since then there has been a fundamental change in the treatment of neurogenic bladder urethral dysfunction. 1, measurement of residual urine volume in the bladder Instruct the patient to catheterize as soon as possible after voiding the urine on their own, and the urine induced is the residual urine volume, or ultrasound can be used to determine the residual urine volume in men less than the bladder. Normal residual urine volume is less than 50 ml for women and less than 20 ml for men. intermittent catheterization should be performed when the residual urine volume is greater than 100 ml. The frequency of catheterization is determined according to the patient’s bladder capacity, pressure and residual urine volume. -When the residual urine volume is less than 100ml, the number of catheterization can be reduced and catheterized once before bedtime and once after the exhibition; when the residual urine volume is less than 50ml, catheterization can be stopped. 2. Simple bladder capacity and pressure measurement The bladder capacity of normal people is 300-500ml, and the pressure in the bladder during the filling period is 10-15 cmH2O. when the pressure in the bladder is greater than 40 cmH2O, the risk of upper urinary tract dysfunction such as ureteral reflux and hydronephrosis increases significantly. Therefore, 40 cmH2O is considered the upper limit of safe pressure. 3. Individualized drinking plan A drinking plan was developed for patients 3 d before the implementation of intermittent catheterization. Instruct the patient to drink regularly and limit the total amount of water, 1800-2000 ml per day is appropriate, drink 100-125 ml every hour. do not drink a large amount of water at one time and do not drink any more water before bedtime. Carefully implement the drinking plan so that the number and time of intermittent catheterization can be reasonably arranged. In addition, provide feedback based on the patient’s intermittent catheterization instruction patient volume (preferably at 400 to 500 ml) and total daily urine volume to develop the habit of regular urination and ensure bladder training at the right time. Intermittent catheterization needs to make the bladder periodically dilate and empty, close to normal using the method of regular catheterization, physiological state, which facilitates the recovery of bladder function. 4 The choice of disposable catheter Disposable F8-12 catheter must be biocompatible, soft and easy to bend, made of highly conformable materials, and meet the requirements of sterility, non-trauma, and easy access. Two types of catheters are widely used: non-hydrophilic coated and hydrophilic coated. For patients who have just started intermittent catheterization after removal of the indwelling urinary catheter, it is best to choose a catheter with hydrophilic coating. After a week, the catheter can be changed to a non-hydrophilic coated catheter; if the patient’s financial condition allows, the hydrophilic coated catheter can continue to be used. Because catheters with a hydrophilic coating are not only less likely to cause complications such as symptomatic urinary tract infections and hematuria, but also reduce the risk of urethral injury, they are the preferred choice for intermittent catheterization.