The invention is a safety syringe with double needle seat and retraction.It is composed of needle cylinder,Needle holder,Needle,The push rod is composed ofThe front end wall of the characteristic needle cylinder is successively provided with a protruding longitudinal fastening strip and a ring shaped groove.The needle seat is composed of the upper needle seat and the lower needle seat.An upper end groove is arranged on the upper end face of the lower needle seat in the cylindrical shape.The inner wall of the upper port of the upper end groove is tapered.The middle part of the inner bottom surface of the upper end groove is provided with the lower end groove.An annular flange is arranged on the upper end of the inner wall of the lower groove.A sealing groove is arranged at the lower end of the inner wall of the lower groove.The lower end face of the lower needle seat is tapered.The center of the lower end face of the conical shape of the lower needle seat is provided with a hole communicated with the bottom surface of the lower end groove.A circular edge is arranged at the lower end of the outer wall of the lower needle seat.The upper needle seat is formed by a liquid guide pipe and a needle seat fixed on the outer wall of the middle part of the liquid guide pipe.An annular edge is arranged on the outer wall of the lower end of the liquid guide pipe.The lower port of the liquid guide pipe is in the shape of a cone.The inner wall of the needle seat is provided with internal thread.The upper needle seat is embedded in the lower needle seat.The needle seat is installed in the front end of the needle barrel.The needle is connected with the needle seat by thread.本創作係為一種具有雙針座結合回縮式安全注射器，係由針筒、針座、針頭、推桿所組成，其特徵針筒內的前端端部壁上依次設突起的縱向緊固條及呈環形狀凹槽，針座由上針座和下針座組成，係呈圓柱形狀下針座的上端面上設上端槽，上端槽上埠內壁處呈錐形狀，上端槽內底面中部設下端槽，下端槽內壁的上端部上設呈環狀突緣，下端槽內壁下端設密封凹槽，下針座下端面呈錐形狀，下針座呈錐形狀的下端面中央設與下端槽底面相通的孔，下針座外壁下端設呈環狀的邊緣，上針座由導液管和固定在導液管中部外壁上的針頭座所形成，導液管下端端部外壁上設呈環狀的邊緣，導液管下埠呈錐形狀，針頭座內壁上設內螺紋，上針座嵌裝在下針座內，針座裝在針筒前端端部內，針頭與針頭座螺紋連接。
