DISPOSABLE SYRINGE Russian patent published in 2005 - IPC

FIELD: medicinal equipment, in particular, disposable syringes for single injection of medicinal preparation, may be used in medicinal enterprises and private clinics.

SUBSTANCE: disposable syringe has hollow cylinder, rod with handle, common piston and destroyable piston, and is further equipped with needle. Common piston is positioned at rod end with handle. Destroyable piston has conical central slot arranged at side adjoining common piston and whiskers loosely passed through openings in common piston and fused at their ends shaped as balls and adapted for maintaining gap between pistons upon extending of rod. Common piston is provided with conical central protrusion, into which micro needle is built. Micro needle is adapted for puncturing thinnest part of destroyable piston, when the latter is biased by common piston during injection provided by tight joining of congruent conical surfaces in central portions of pistons. Protrusions formed at rod end adjoining handle abut against cylinder base at the initial position of rod and are adapted for preventing destroyable piston from puncturing until medicinal preparation is drawn into syringe. Upon single injection of medicinal preparation, syringe loses its air-tightness at side adjoining destroyable piston and may not be further used.

EFFECT: simplified construction and provision for impossibility of repeated usage of syringe.

2 dwg