Medical needle device with mis-punctuation prevention shield

Is provided with the needle (1) sleeve (2) is end is formed on a convex part (11), the convex part (11) with battens the protrusion height of vestlet (4a) hole. Formed with is extended from the end of vestlet's inner wall of the inner wall of the portal type groove (12a), the portal type provided with a can be assembled the convex part at the tail end of the. The sleeve rocking to the bump is partially with a door groove type end relative position, capable of preventing the sleeve by at least a convex part and vestlet terminal matched with between end faces; the side to the vestlet movable. The sleeve rocking to the convex part and a door groove type end relative position; the bump sliding in the main type groove partially, thus capable of moving set, and a receiver terminal of vestlet. A a ring of with a prick, a syringe cannot movable to a pricks of the protection mask is box and a swinging.