Esophageal stricture is the narrowing of the lumen of the esophagus due to various reasons such as disease of the esophagus itself (e.g. esophageal cancer) or external pressure (e.g. mediastinal tumor), which manifests as difficulty in swallowing and choking on food. When esophageal cancer is complicated by esophageal-tracheal fistula or esophageal cancer-mediastinal fistula, patients not only have to endure the pain of not being able to eat and the resulting malnutrition, but also have uncontrollable pulmonary or mediastinal infections. Traditional treatment: Surgery is preferred for malignant esophageal strictures, i.e., resection of the strictured segment of the esophagus through a dissecting incision, followed by an end-to-end esophageal anastomosis. It is painful, costly and risky for the patient. Interventional treatment: Under X-ray fluoroscopy, a 1 mm diameter guidewire is sent to the esophageal stricture site, which can rapidly release the esophageal stricture and seal the fistula at the same time to control the lung or mediastinal infection.