The computer-controlled local anesthetic injector (STA) introduced from the U.S.A., through a special device, the transmission and injection of anesthetic liquid are completely controlled by computer, which enables patients to really enjoy a comfortable and painless feeling during the anesthetic injection process. In addition, STA system also has the following features: 1, through the video and audio system prompts, so that the past “blind” injection has become clear and controllable; 2, double-rotation puncture technology so that the injection site is more accurate, improve the success rate of anesthesia; 3, automatic cruise function to improve the effect of anesthesia, and the patient does not have local numbness and discomfort after anesthesia.