Safety hypodermic syringe

Details Safety hypodermic syringe Safety hypodermic syringe

2000-07-21

2001-02-27

Yasko, John D. (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

C604S195000

Reexamination Certificate

active

06193687

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a hypodermic syringe, and more particularly to a safety hypodermic syringe, which enables the needle assembly to be received inside the syringe barrel after the service of the syringe.
Regular safety hypodermic syringes are made for enabling the user (nurse or doctor) to pull the needle assembly backwards to the inside of the syringe barrel after injection, preventing possible contamination of bacteria or virus through the needle cannula. Taiwan Patent #356013 discloses a similar design of safety hypodermic syringe. However, this design of safety hypodermic syringe is still not satisfactory in function. When pushing the plunger into engagement with the needle assembly, a minor vibration occurs, causing the patient to feel uncomfortable.
SUMMARY OF THE INVENTION
The invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a safety hypodermic syringe, which enables the needle assembly to be pulled backwards and received inside the syringe barrel after the use of the syringe. It is another object of the present invention to provide a safety hypodermic syringe, which eliminates the occurrence of vibration during injection. It is still another object of the present invention to provide a safety hypodermic syringe, which saves much fabrication time, and reduces the manufacturing cost. According to the present invention, the safety hypodermic syringe comprises a barrel, a needle assembly, a female connector, a plunger, and a male connector. The needle assembly is disposed at the front side of the barrel, and connected to the front side of the female connector. The female connector has a rear retaining hole that can be radially reduced or expanded, and a rear side mounted with an elastic band. The elastic band imparts a radial compression force to the rear part of the female connector, causing the rear retaining hole to be reduced to the smallest status. The elastic band can be molded from rubber or other equivalent material. The male connector comprises a shank forwardly extended from the front side of the plunger, and a head at the front end of the shank. When pushing the plunger forwards in the barrel, the head of the male connector is forced to expand the rear retaining hole. After passed through the rear retaining hole, the rear retaining hole is reduced to stop the head of the male connector from backward movement, and therefore the needle assembly and the female connector are moved backwards with the male connector and received inside the barrel when pulling the plunger backwards to the rear end of the barrel. Because the opening status of the retaining hole is controlled by the elastic band, little vibration is produced when engaging the head of the male connector into the retaining hole of the female connector.


REFERENCES:
patent: 5634903 (1997-06-01), Kurose et al.
patent: 5645535 (1997-07-01), Goldberg
patent: 5693023 (1997-12-01), Adams
patent: 5820605 (1998-10-01), Zdeb

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