Anti-backup improvement for hypodermic syringes

Details Anti-backup improvement for hypodermic syringes Anti-backup improvement for hypodermic syringes

1992-10-20

1996-08-13

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604208, 604211, A61M 500

Patent

active

055451470

ABSTRACT:
The present invention provides an improved device for preventing the backing up of a nut on a threaded piston rod in the barrel of a hypodermic syringe at the end of dose administration from such syringe. The preferred device is a pawl mounted on the end of a flexible arm of a nut which cooperates with slots on the inside of a syringe barrel. The nut also has an incline surface at the end which mates with an incline surface in the barrel end. The mating of these surfaces at the end of dose administration forces the pawl into a slot, thereby preventing rotation of the nut in the wrong direction and the concurrent movement of the nut up the piston rod associated therewith.

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