It can be inserted into the stomach, jejunum or duodenum from the nasal cavity or oral cavity for gastrointestinal decompression. The surface is equipped with a hydrophilic and super-slippery coating. It is easy to insert, relieves patient discomfort, has minimal mucosal damage, and can be long-lasting. It is inserted into the body for a certain period of time to carry out the input of liquids and liquid nutrition, drainage (absorption) of fluids, etc.