The present invention relates to a medical device, and is mainly attributable to the retractable safety syringe with selective trigger, comprising: a hollow body, a central rod, piston, matching device for the needle and locking housing part, the blocking housing part is made of a flexible polymeric material, a hollow body provided with a positioning groove, a large O-ring and the zero line, the central core is provided with a tensioning projection and the plate, matching device for the needle is provided with an annular positioning projection, the inner sealing ring and pulls the ring locking the housing part is provided with a sealing plate, sealing coil member, the mounting ring and limiter. Large sealing plate and a sealing ring, a sealing coil member and the inner sealing ring densely planted to each other respectively to form a sealing structure. When the adjusting ring interacts with the tension lug, and then it is pulled through the center of the rod, matching device for the needle is retracted together with him in the hollow body by fitting the coil member and the sealing ring is pulled. The inner cavity of the annular ledge terminating the installation of the needle device can be inserted for fixing the stopper ring installation groove in the mounting lug of the hollow body. Consequently, the locking housing part is adapted to perform three functions and simplifying construction. Since the distance L is predetermined trigger, when the front of the line of the piston seal and the zero line are overlapped with each other selective trigger safety mechanism can be realized.Настоящая полезная модель относится к медицинскому устройству, а главным образом относится к втягиваемому безопасному шприцу с селективным пусковым механизмом, содержащему: полый корпус, центральный стержень, поршень, согласующее устройство для иглы и блокирующую корпусную деталь, причем блокирующая корпусная деталь выполнена из эластичного полимерного материала, полый корпус снабжен установ
