SYRINGE WITH REUSE PROOF DEVICE (VERSIONS) Russian patent published in 2009 - IPC A61M5/50 A61M5/315 

FIELD: medical equipment.

SUBSTANCE: syringe contains cylinder with liquid filled cavity, open tail end and lead end closed by wall with the hole connected to internal cavity of cylinder; gaunt hollow rod with internal surface which includes at lead end of rod, at least, one cutout with back wall, and, at least, one rod stop block; piston with round sealing element tightly pressed with its external surface to internal surface of cylinder, with stem end inwards the rod. Stem end contains at least one rod stop block. Sealing element contains at least one console with edge on its external surface at the free end. Edge size is equal to that of cutout in the rod. Besides, the syringe contains closure with central part in which there is a hole with, at least, console fork protruding towards lead end of the syringe and supplied with free extrorse beard catching internal surface of the cylinder, and with, at least, one bolt in the hole. In specified closure, beard of its console fork rests on internal surface of rod near to, at least, one stop block. The piston stem end enters into the hole of the central part of closure so that, at least, one bolt thereof rests on the piston stem end near to, at least, one rod stop block. Edge on external surface of the piston console enters into cutout in the rod, while the latter is driven by effort applied towards tail end of the cylinder relative to the piston towards tail end of a syringe until free end of console fork of the closure moving towards lead end on internal surface of the rod, contacts, at least, one rod stop block, and edge of the piston console rest on forward wall of cutout of the rod which moves the piston towards tail end of the syringe at the certain distance, and moving with closure resting on, at least, one stop block driven by effort applied to the rod towards lead end of the syringe and liquid injection from the syringe cylinder. Upward bolt of the closure rests on, at least, one rod stop block. The rod resting on the piston moves it towards leading end of the syringe. The piston injects liquid from the cylinder. Then the syringe positions so that driven by effort to the rod towards tail end of the syringe, the rod moves towards tail end of the syringe. Free end of console fork of the closure slides on internal surface of lead end of the rod and, having passed through lead end of the rod, press itself to internal surface of the cylinder, blocking further moving of the rod towards tail end of the syringe.

EFFECT: syringe reuse proof.

27 cl, 18 dwg