The intestine is filled with liquid (usually water) and enters the anus. When the liquid reaches a certain amount in the body, the human body begins to have the desire to defecate. The liquid filled into the body will mix with the feces in the body, and then the feces in the body will be excreted.
Repeat this several times, and the feces in the body will be excreted. Enema, that is, introducing colon perfusion fluid from anus to rectum through catheter, achieves the therapeutic purpose of relaxing bowels and exhausting gas. In fact, this is not a strange medical measure.
As early as 1800 years ago, the technology similar to enema has been used as a clinical treatment.