Urinary catheters have brought good news to patients who need indwelling urinary catheters, and are used more and more clinically. However, with the increase in their applications, the difficulty of catheter removal has become more and more common. Especially for long-term indwelling urinary catheters, sometimes due to the aging of the rubber, the balloon lumen will be blocked, and it may cause serious complications when forcibly removed. In order to prevent the aging of the surface of silicone rubber in contact with the human body, oxygen plasma treatment is required on the surface.