Safety injector needle

A safety injector needle, comprising a needle seat, an injection needle axially fixedly connected to the needle seat, and a trigger protection assembly assembled on the needle seat, wherein:

• the needle seat includes an assembling part and a fixing part, and the assembling part is arranged in a hollow tube shape;
• the trigger protection assembly includes a case, a trigger mechanism and an elastic element;
• the case is arranged in a hollow tube shape and is fixedly connected to the assembling part, and the inner wall of the case is provided with a first displacement chute, a second displacement chute and a locking chute corresponding to the trigger mechanism;
• the trigger mechanism includes a first trigger mechanism and a second trigger mechanism. The first trigger mechanism is provided with a first inclined guide surface, a limiting slider corresponding to the first displacement chute and the second displacement chute, and an elastic slider corresponding to the locking chute;
• the second trigger mechanism is provided with a second inclined guide surface for driving the first trigger mechanism to rotate in the axial direction of the assembling part;
• under the action of external force, the first inclined guide surface and the second inclined guide surface cooperate with each other to drive the limiting slider and the elastic slider to rotate in the axial direction of the assembling part, so that the limiting slider turns from the first displacement chute to the second displacement chute, and when the limiting slider slides into the second displacement chute, the elastic slider is clamped in the locking chute inside.