Drainage tubes inserted from nasal cavity are mostly used to drain gastric juice, and most of them need negative pressure drainage, which can effectively drain gastric juice. For some patients who can't eat, it is also very convenient to eat (rice can be put through the stomach tube). There are also some small white tubes to drain bile. When you say conventional drainage tube, you probably mean the kind that is cut on the skin and then intubated. Most of that kind of drainage does not enter organs, but discharges gas or liquid into abdominal cavity or chest cavity, which can effectively control infection and is of great help to disease treatment. Various drainage tubes have different drainage positions and functions, and different diseases require different drainage tubes. Therefore, the effects of these drainage tubes cannot be compared.