Preventing catheter dislodgement: 1. Proper fixation is the most important measure to prevent catheter dislodgement. Current catheters have an airbag at the front end which can play the role of fixing the catheter. The volume of the airbag is usually about 5-10ml, so at least 5ml of air or sterile saline etc. needs to be injected to prevent the catheter from falling off. If the amount of injection is too small, it will not play a fixed role and will be more likely to fall off. 2, avoid pulling with force, if the use of violent pulling or unconscious state by a certain force of pulling, it can lead to the catheter off, so with the catheter period, we must pay attention to avoid excessive force, walking or activities, first of all, the catheter should be fixed, and then the relevant walking or activities. 3.Regular replacement, this situation often refers to the process of patients needing to wear catheters for a long time. If the catheter is worn for a long time without regular replacement, the material of the catheter may deteriorate and the air sac may rupture spontaneously, leading to the phenomenon of catheter dislodgement. In principle, it is necessary to replace the catheter with a new one at intervals of about 2-4 weeks to prevent the catheter itself from aging and falling out.