Injection device for anesthesiology department

The injection device for the anesthesia department comprises a cylinder, a piston head is connected to an inner wall piston of the cylinder, a connecting rod is fixedly connected to the right side face of the piston head, the right end of the connecting rod extends to the outside of the cylinder, and a push plate is fixedly connected to the right end of the connecting rod. The push plate and the connecting rod are arranged to control the piston head to move, so that the piston head can be matched with the barrel body to extract medicine, and the threaded rod is in threaded connection with the threaded hole, so that the threaded rod can move up and down; the threaded rod can be positioned through counter-acting force generated after the threaded rod moves downwards and makes contact with the inner bottom wall of the sliding hole, the threaded rod can be matched with a positioning hole to be matched with a sliding plate to position a push plate, the moving distance of a piston is limited, and therefore extracte