Safety syringe cylinder

A safety syringe cylinder comprising a syringe cylinder, a syringe needle, a push rod;

• wherein
• an upper end of the syringe cylinder has a syringe connecting seat;
• and a center of the syringe connecting seat has a positioning groove;
• an upper end of the syringe needle is a needle tube and a lower end thereof is a needle;
• a lower end of the needle has a hook seat;
• two wedge rings are arranged around the needle;
• a center of the hook seat is a channel hole;
• the channel hole penetrates through the needle so as to communicate with the needle tube;
• a top of the push rod has a push rod body which is formed with a connecting block;
• the connecting block is inserted into the combining hole of a push rod cap;
• the push rod cap is made of elastic material;
• a periphery of the push rod cap has a positioning groove;
• a top center of the push rod cap has an annular hook groove;
• the hook groove has two stepped enlarged holes;
• thereby, the syringe needle is combined with the positioning hole of the syringe connecting meat of the syringe cylinder;
• and push rod is inserted into the cylinder body of the syringe cylinder;
• wherein an inner upper end of the syringe cylinder is installed with an annular ring;
• the annular ring is embedded into the hook groove on the top surface of the push rod cap when the push rod moves upwards to a top end of the syringe cylinder so as to prevent the injection liquid remained in the hook groove.