Disposable hypodermic syringe and method of manufacture

Details Disposable hypodermic syringe and method of manufacture Disposable hypodermic syringe and method of manufacture

1977-05-16

1978-10-24

Yasko, John D.

Surgery

Respiratory method or device

Ozone or ion generation

128218N, A61M 500

Patent

active

041215885

ABSTRACT:
The disclosure is of a disposable hypodermic syringe and the method of its manufacture. The syringe comprises a barrel, a piston-plunger slidably mounted in the barrel, a handle and shank connected to the piston-plunger, a needle hub welded to and closing one end of the barrel and supporting a hypodermic needle, a shield for the needle and a cap which closes the other end of the barrel. A novel feature of the syringe of the invention is a weakened zone of the barrel in a line circumscribing the barrel at a point adjacent to the edge of the needle hub. An advantage of the syringe of the invention is its disposability after use. To dispose of the syringe, the operator first replaces the shield over the needle and hub. The hub with the enclosed needle may then be broken off along the weakened zone of the barrel by bending, so that the barrel is destroyed and the needle is enclosed within the shield and hub in such a manner that it may not be re-used or misused without considerable and extraordinary effort. The needle hub and barrel form a sealed annular chamber when assembled, which isolates the barrel-hub welding zone from the fluid path of the syringe. This chamber will trap any flash which may be generated by the welding process.

REFERENCES:
patent: 3306291 (1967-02-01), Burke
patent: 3320954 (1967-05-01), Cowley

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