Dental syringe having an automatically retractable needle

Details Dental syringe having an automatically retractable needle Dental syringe having an automatically retractable needle

1987-04-20

1988-08-30

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604232, A61M 532

Patent

active

047674130

ABSTRACT:
A disposable dental syringe of the type having a pre-filled ampule of fluid medication and a double ended hypodermic needle arranged in spaced, axial alignment with the ampule. The ampule may be moved axially through the cylinder of the syringe until the proximal end of the needle penetrates the ampule and the distal end of the needle extends outwardly from the cylinder for administering an injection. The ampule is locked in the distal position so that an injection may be administered. Upon completing the injection, the ampule is released from the distal position and moved proximally through the cylinder, so that the distal end of the needle is automatically retracted within the cylinder. The syringe may now be safely discarded with the hypodermic needle completely shielded within the cylinder, so as to eliminate the necessity of handling and/or breaking the needle and, thereby, avoiding the possibility of an accidental needle strike.

REFERENCES:
patent: 3055362 (1962-09-01), Uytenbogaart
patent: 3066670 (1962-12-01), Stauffer
patent: 3136313 (1964-06-01), Enstrom et al.
patent: 3306290 (1962-02-01), Weltman
patent: 3605744 (1971-09-01), Dwyer

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