Push-type safety protection mechanism of blood collection needle

A push-type safety protection mechanism of a blood collection needle, comprising a sleeve member and a valve core member which is accommodated in the sleeve member and slides forward and backward inside the sleeve member, wherein the valve core member is a hollow pipe and provided with three parts, namely a needle seat part which is positioned at the front part and connected to the blood collection needle, a sleeving part which is positioned at the rear part and connected to a guide pipe, and a stopping part which is at least partly higher than the needle seat part;

• a plurality of limiting grooves is formed in the stopping part;
• the outside of the needle seat part is sleeved with a compression spring, wherein one end of the compression spring abuts against the stopping part, and the other end of the compression spring abuts against the inner side wall of a mouth of the sleeve member;
• the sleeve member is provided with two parts, namely a first sleeve part positioned at a front section and a second sleeve part positioned at a rear section;
• an elastic button higher than the side wall of the first sleeve part is arranged on the side wall of the valve core member;
• a limiting opening matched with the elastic button is formed in the side wall of the first sleeve part;
• a limiting sliding cavity for accommodating the elastic button and the valve core member is formed from a position of the first sleeve part from the limiting opening to the inner side of the second sleeve part, and the limiting sliding cavity guides and limits front-back movements of the elastic button and the valve core member;
• and a plurality of elastic limiting protrusions matched with the limiting grooves is arranged on the inner wall of the tail sliding cavity of the second sleeve part.