A rotational locking type safety insulin pen needle comprises a needle body, an intermediate shield, a front shield and a spring, wherein: the intermediate shield is provided with a rotating tube and the rotating tube is provided with a beveled rail on the outer edge; relative to the beveled rail, the front shield is provided with a bevel acting part on the inner edge; the rotating tube is provided with an elastic arm in the front and the elastic arm is provided with a front protection stopper; relative to the front protection stopper, the front shield is provided with a guiding slot and a limit slot at intervals along the circumferential direction. The present invention uses the backward movement of the front shield when the needle is pushed to drive the rotation of the rotating tube and uses the coordination of the front protection stopper on the rotating tube with the guiding slot and limit slot on the front shield to change the coordination relationship between the front shield and the rotating tube, which effectively provides the reliable locking protection of the front shield after use.
展开▼
