A kind of safety syringe structure improvement of what is closed in this creation system,Its mainly by syringe,Injection device and push rod are formed,It is wherein to define a stop section between syringe what inner wall and position what opening and accommodating space,And the airtight column being arranged on push rod be other than it need to only paste syringe inner wall,What injection, which finishes Hou, mutually to be fixed with injection device,It is set there are three fixed elastic portion by the airtight column of what therefore is more easier when airtight column is fixed with injection device,In addition,In order to allow injection device to store to then must drawing push rod to Hou in accommodating space,At this point,When injection device be detached from opening Hou then will receive in fixed elastic portion protrude out section contact and banking,So that the syringe needle on injection device contradicts stop section and can not be elapsed again towards the opening direction,Use safety and the convenience promoted using Hou.本創作係關於一種安全針筒結構改良，其主要由針筒、注射裝置及推桿所組成，其中針筒於內壁面且位於開口與容置空間之間係界定一抵止部，而推桿上設置的氣密柱除了需僅貼針筒內壁面外，於注射完畢後必須與注射裝置相固定，由於氣密柱置有三個固定彈性部因此在氣密柱與注射裝置固定時更加容易，另外，為了讓注射裝置收納至容置空間內則必須將推桿向後拉，此時，當注射裝置脫離開口後則會受到固定彈性部上的凸伸段所頂觸而向一邊傾斜，使得注射裝置上的針頭抵觸抵止部而無法再次被朝該開口方向推移，藉以增進使用後的安全性及便利性。
