Nasal feeding is a method of manually transporting food ingredients to the gastrointestinal tract through a special "nasal feeding tube". It is applicable to some special patients, such as those who cannot swallow and those who cannot eat by mouth in a short time. The nasal feeding tube is a slender medical tube, which enters the stomach from the nasal cavity through the esophagus, and can enter the duodenum as far as possible. During nasal feeding, food ingredients are injected into the pipeline through a special infusion device. The food directly enters the stomach or duodenum without mouth and esophagus, so as to ensure the basic nutritional needs of patients without taking food orally.