An interlocking safety needle assembly comprises a syringe and a sleeve, wherein the syringe comprises a barrel, a needle shaft, and a needle core. The surface of the barrel comprises at least a sliding body, the needle shaft is coupled to one side of the barrel, and the needle core is sleeved into the barrel, at least one pushing element is arranged in a movable manner on one end of the needle core that is not sleeved into the barrel, the pushing element extends in the direction towards the needle core, the sleeve is sleeved over the barrel in a movable manner and fitted between the pushing element and the barrel, the sleeve is provided with at least one guiding groove on the sheathing surface, the guiding groove is fitted on the sliding body, and one side of the sleeve is provided with a elastic jacket. By pulling back the needle core to extract medicine or diluent, the pushing element moves to a pushing preparation position on one side of the sleeve. When injection is performed, the needle core moves in conjunction with the sleeve and the elastic jacket to achieve complete coverage of the needle shaft by pushing the pushing element, and the needle shaft is completely covered when being pulled out from the injection site, thereby overcoming the disadvantages of prior arts that complete coverage of the needle shaft is possible only after the syringe is removed, preventing personnel from being infected with blood borne infectious diseases caused by needlesticks, and enhancing safety.一種連動式安全針具,包含一注射器、一套筒,該注射器包含一針筒、一針頭、一針心,該針筒表面包含至少一導滑體,該針頭結合於該針筒一側,該針心套入於該針筒,該針心於未套入該針筒之一側以活動狀設有至少一推件,該推件朝該針頭之方向延伸,該套筒活動狀套設該針筒並配適該推件、該針筒之間,該套筒於套設面具有至少一導槽,該導槽配適於該導滑體,該套筒一側具有一彈性套。藉由回拉針心抽藥或稀釋液使推件移動至套筒一側之推動準備位置,進行注射動作時,針心藉由推件之推動即可連動套筒、彈性套達到完全覆蓋針頭,並且能於針頭拔出注射部位時已全部遮覆,突破現有注射器拔出才可遮覆的缺點,避免因為針扎(needlestick)導致人員感染各種血液性傳染病之情形,增進安全性。10‧‧‧注射器11‧‧‧針筒12‧‧‧針頭13‧‧‧針心14‧‧‧推件20‧‧‧套筒22‧‧‧凹槽23‧‧‧缺口30‧‧‧彈性套32‧‧‧溝部
