Syringe and prefilled syringe

A syringe (and a prefilled syringe) of a structure with ventilation means allowing a pusher to be easily pushed or pulled in use, providing an excellent operability of discharging (injecting) chemicals, making it hard for foreign matter such as dirt and dust to enter into a syringe outer tube when not in use during storage or transporation, capable of assuring, by itself, the sanitation of the syringe outer tube when not in use, and allowed to be shipped without individually packaging the syringe with packaging material, wherein, as more desirable embodiments, the aseptic condition in the outer tube can be surely maintained even if the push and pull operations of the pusher are performed and, even if the pusher is pushed when not in use, a gasket does not move in tip direction and the arrangement of the pusher at the time of shipping can be stably maintained.

Wrap spring clutch syringe ram and frit mixer

A wrap spring clutch syringe ram pushes at least one syringe with virtually instantaneous starting and stopping, and with constant motion at a defined velocity during the intervening push. The wrap spring clutch syringe ram includes an electric motor, a computer, a flywheel, a wrap spring clutch, a precision lead screw, a slide platform, and syringe reservoirs, a mixing chamber, and a reaction incubation tube. The electric motor drives a flywheel and the wrap spring clutch couples the precision lead screw to the flywheel when a computer enables a solenoid of the wrap spring clutch. The precision lead screw drives a precision slide which causes syringes to supply a portion of solution into the mixing chamber and the incubation tube. The wrap spring clutch syringe ram is designed to enable the quantitative study of solution phase chemical and biochemical reactions, particularly those reactions that occur on the subsecond time scale.