DISPOSABLE SYRINGE Russian patent published in 2014 - IPC A61M5/00 A61M5/50 

FIELD: medicine.

SUBSTANCE: what is presented is a syringe comprising a body, a rod piston and a needle. A body opening comprises a circular groove; the piston also comprises a rectangular circular groove which integrates an unclosed ring spring element. The width of the spring element correlates with that of the circular grooves in the body opening and on the piston. An external diameter of the spring element in a free condition correlates with the diameter of the circular groove in the body, while an internal diameter of the spring element in the free condition is less than the diameter of the body opening. The smaller body opening comprises a lightly tensed support with a working end face of the piston resting against when assembled and transported. The above circular groove in the body opening is rectangular or trapezium-shaped. The above unclosed ring spring element represents an irregular rectangle, square or trapeze in section with an upper side presented to a convex curve. The diameter of the circle formed by intersection of the above curve and a side of the irregular rectangle, square or trapeze is greater than the diameter of the body opening in the free condition of the unclosed ring spring element. The above rest comprises at least one through flattened surface.

EFFECT: invention enables reducing efforts for the piston movement in the process of injection, eliminating repeated use of the syringe, and facilitating the assembly process.

3 cl, 7 dwg