Interventional procedures for esophageal cancer often use invasive methods that touch the mucosa on the surface of the esophagus or cancer, or cause local reactions because of drug injection, and therefore there is some pain. In the awake state, for example, drug injection, local electrocoagulation and destruction by microwave and high-frequency electricity cause mucosal irritation and edema. The obstruction site requires placement of an internal stent, which will compress the esophageal wall during stent propping, causing some pain because the esophageal mucosa and nerves are rich in sensation. However, to avoid such sensation or pain, painless anesthesia technique can be used, i.e., patients can be injected with sedative and sleeping drugs in the blood vessels, which makes the sensation of the treatment process become dull and less painful, which is a better method at present.