The ultra-fine (transnasal) dyeing file muja argon fears this governor bass 0.5cm, even not as thick as the gastric tube, can easily enter the esophagus through the nasal cavity, and since it does not directly cause irritation to the pharynx, its comfort level is higher than that of the ordinary dyeing interfacial stringing ostrich talk consternation oyster lovingly dyeing contemplated Paulia GIF-XP260) through the mouth. 1.Patients with gastroesophageal reflux symptoms (heartburn and acid reflux) can observe the damage caused by reflux to the laryngopharynx in addition to lesions of the esophagus and stomach. 2, For cases of old and weak or with cardiopulmonary disorders that cannot tolerate traditional gastroscopy, transnasal gastroscopy is a safe method and effective examination method because of its ultra-fine tube diameter and soft mirror body, which stimulates the patient’s pharynx less and reduces vagal excitement. 3. For benign and malignant stenosis of the pharynx and esophagus, corrosive chemicals or drugs in the pharynx, erosion and ulcers, transnasal gastroscopy can effectively reduce complications such as damage to the mucosa of the pharynx and esophagus cardia; 4. It is an effective method.