Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
2001-05-31
2002-10-01
Huson, Gregory L. (Department: 3751)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S110000, C604S228000, C604S218000, C604S187000, C604S194000
Reexamination Certificate
active
06458101
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a hypodermic syringe, and more particularly to a safety structure of the hypodermic syringe.
BACKGROUND OF THE INVENTION
The needle of a hypodermic syringe poses a safety hazard to the medical personnel. In light of high risk of infection of disease by the hypodermic needle, the conventional hypodermic syringes are generally provided with a needle which can be drawn into the barrel in the wake of hypodermic injection, thereby preventing the discarded syringe from becoming a potential safety hazard.
Such conventional hypodermic syringes as described above are defective in design in that they are complicated in construction, thereby resulting in high rejection rate. There are also certain similar hypodermic syringes which are rather simple in construction and can be made in quantity at a low cost; nevertheless they do not work with precision and are therefore not well received by the medical personnel at large.
SUMMARY OF THE INVENTION
It is the primary objective of the present invention to provide a hypodermic syringe with means to draw the hypodermic needle into the barrel of the syringe in the wake of injection.
It is another objective of the present invention to provide a hypodermic syringe with means to locate the needle holder thereof.
It is still another objective of the present invention to provide a hypodermic syringe which is simple in construction and works with precision.
The hypodermic syringe of the present invention comprises a barrel which is provided at a front end with at least one catching piece which is in turn provided in the inner edge with a retaining tooth. The barrel is provided with an outer ring and a locating projection. An outer sleeve has a ring body and an axial fitting hole for fitting over the barrel. A contraction edge is provided with an insertion hole. An inner protruded ring is disposed in the inner edge of the fitting hole. The ring body is provided at the front segment with at least one escape hole. A locating slot is provided with a first hole, a second hole, and a through hole. A protruded point slot channel extends from the outer end edge to the first hole. A needle holder has a barrel cooperating portion which is provided with outer circular groove to accommodate two O rings and is capable of sliding in the receiving hole of the barrel. A retaining shoulder is connected at one side of the barrel cooperating portion. A retaining circular groove is disposed in the outer periphery of the retaining shoulder. A fluid transporting hole is provided axially. A plunger has a rod body which is provided with a severing portion. A retaining hook is provided at the front end. The plunger is provided at the front end with a stopper.
The retaining tooth of the barrel catches the retaining circular groove of the needle holder by turning the outer sleeve in relation to the first position of the syringe, or turning the outer sleeve to the second position, thereby enabling the escape hole to be corresponding to the catching piece of the barrel, so as to eject outward. The needle holder is free to displace such that the needle is drawn back by the plunger.
REFERENCES:
patent: 4846808 (1989-07-01), Haber et al.
patent: 5693023 (1997-12-01), Adams
patent: 5876382 (1999-03-01), Erickson
patent: 6409702 (2002-06-01), Hu
Browdy and Neimark , P.L.L.C.
Huson Gregory L.
Lu Li-Hua
Ramana Anuradha
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