Disposable safety syringe having means for retracting its needle

Details Disposable safety syringe having means for retracting its needle Disposable safety syringe having means for retracting its needle

1988-01-14

1989-05-02

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604198, 604232, A61M 532

Patent

active

048264890

ABSTRACT:
A disposable safety syringe, such as a dental syringe, comprising a syringe cylinder having proximal and distal ends, a pre-filled fluid medication cartridge movable through the cylinder, and a double-ended hypodermic needle cannula extending through and being bonded to a bore formed at the distal end of the cylinder. A piston is movable distally through the cartridge for expulsing the fluid contents via the needle cannula and for engaging one end of the cannula. The cartridge is moved through the cylinder and into contact with the distal end thereof to cause the distal end to be relocated relative to the needle cannula. Accordingly, the bond between the distal bore and the needle cannula is broken. The piston is then moved proximally through the medication cartridge for correspondingly relocating the needle cannula through the distal bore and into the empty medication cartridge, wherein the cannula is completely shielded and irretrievably located. The syringe is now rendered non-reuseable and suitable for a safe disposal without subjecting health care workers to an accidental needle strike as a consequence of a careless handling or cutting of the cannula.

REFERENCES:
patent: 2722215 (1955-11-01), Dahlgren
patent: 2880725 (1959-04-01), Kendall
patent: 2888924 (1959-06-01), Dunmire

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