Why can urinary catheter lead out urine in bladder? What is the principle?

Hello, the catheter enters from the urethral orifice, directly enters the bladder, and excretes urine through the inner orifice of the catheter. This principle is very simple, just like inserting a straw into a milk box, milk can flow out. Because it is impossible to have a face-to-face physical examination, it is necessary to go to the urology department in time under special circumstances.