DISPOSABLE SYRINGE WITH AUTOMATIC DESTRUCTION FUNCTION Russian patent published in 2014 - IPC A61M5/00 

FIELD: medicine.

SUBSTANCE: group of inventions refers to medical equipment and characterises versions of an undersized disposable syringe with an automatic destruction function. According to the first version, the syringe comprises a syringe cylinder, a piston rod and a locking element. The syringe cylinder has an inner surface forming the cavity, an open end and a distal end. The piston rod has a lock portion, a flange for applying the user's force, an elongated body, a hollow along this elongated body and a group of first teeth. The group of first teeth is formed inside the hollow on the elongated body and forms a group of projections facing in the distal direction and equally distributed along the major portion of the elongated body. The locking element slides inside the cavity along the above major portion of the elongated body; this locking element interacts with the inside of the syringe cylinder so that the locking element cannot be movable towards an open end of the syringe cylinder, and can interact with the piston rod so that the piston rod and the locking element can be movable together in the distal direction to the distal end of the syringe cylinder. The above hollow extends from the locking element to the above flange. The locking element is buried into one hollow of the elongated body of the piston rod.

EFFECT: inventions enable providing the piston fracture in the target direction by imbalances of the structural integrity between the reduced cross section and the remained portion of the piston.

42 cl, 19 dwg