Bladder irrigation requires the use of a three-lumen urethral catheter. Try not to use a needle stuck in the urethral catheter for irrigation to avoid the needle accidentally sticking to the urethral air sac and causing the urethral catheter to dislodge. This will require the patient to have another indwelling catheter, increasing the patient’s pain, and the use of a three-lumen catheter is recommended. There are three chambers behind the three-chamber catheter, the first chamber is the balloon chamber, the second chamber is the flushing chamber, and the third chamber is the drainage chamber. This is done by simply inserting the flushing port into the appropriate lumen and performing a reflux flush. If a needle is used for flushing, the needle mistakenly sticks in the air sac, which is of secondary importance. The main point is that if the needle is stuck in the urinary catheter for flushing, it simply cannot enter the bladder and flow out with the urinary catheter, so it cannot serve the purpose of flushing fluid into the bladder for circulating flushing, so it is not recommended to stick the needle in the urinary catheter for flushing. If you must use a needle tied to the ureter for flushing, it is recommended that it be inserted into the outlet drainage lumen and that the ureter be clamped shut. Usually about 100mL of saline is instilled into the bladder and stopped for 15-20 minutes before opening the urinary catheter to allow the flushing fluid to flow out. Continuous flushing after sticking a needle in the urethra is not recommended, as this does not serve the purpose of flushing.