SYRINGE Russian patent published in 2003 - IPC

FIELD: medical equipment, applicable for injections. SUBSTANCE: syringe consists of a cylinder and a plunger having a packing and placed in it for movement along the cylinder longitudinal axis. To prevent a re-use of the syringe, which serves as disposable syringe and becomes unfit for use after the first use, a member forming an unevenness on the cylindrical surface of the cylinder inner wall is made on it, which represents grooves or a lug, and the plunger has a stopper, which at a reverse travel of the plunger gets engaged with the groove or lug and prevents further movement of the plunger. The stopper is positioned on the plunger. The stopper is positioned on the plunger head near a flexible packing cap. The stopper may be made in the form of a pair of lugs or in the form of disk having the shape of a cross. EFFECT: prevented re-use of the syringe. 14 cl, 21 dwg