Safe needle device for syringe

Details Safe needle device for syringe Safe needle device for syringe

2000-03-10

2001-11-27

Nguyen, Anhtuan T. (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

C604S110000

Reexamination Certificate

active

06322540

ABSTRACT:

INTRODUCTION
The present invention is directed in general to a safe needle device for syringes as used in the medical industry and hospitals.
BACKGROUND OF THE INVENTION
With the advent of AIDS and other highly infectious diseases, syringes and scalpels and other sharp devices have caused numerous injuries and infections to the administering medical staff. Legislation has been enacted, including California (State of California Labor Code §144.7(d)) requiring some type of protection to the medical staff.
Protective devices have been proposed, but these devices have been scattered and non-functional and are not user-friendly. For example, a nurse must use two hands to prepare a patient for an injection. One hand is used to clean the area to be injected with a disinfectant while the other hand is used to inject the needle into the tissue. After removing the needle from the patient, the administering nurse must press on to the spot of injection and hold the syringe in the other hand. After pressing the spot of injection is completed (to stop the flow of blood), the nurse, in prior protective devices, then uses that hand to twist a cover over the syringe or sharp That requires two hands during which time the needle may drip blood onto the patient or the nurse where contamination is inevitable. In addition, the maneuvering to accomplish the foregoing may cause an inadvertent puncturing of the nurse's own skin, thus inviting infection. One such device requiring a two-handed operation is Badger U.S. Pat. No. 5,885,257, which is a very cumbersome releasable retaining device to retract the needle syringe where it will not cause harm.
OBJECT AND SUMMARY OF THE INVENTION
It is a general object of this invention to provide an improved safe needle device for syringes.
In accordance with the above object, there is provided a needle-stick safety syringe comprising an inner tubular body, plunger, and extended needle at the distal end of the tubular body. A larger protective tubular body is concentric with the inner tubular body and freely slidable thereon. Spring means between the proximal ends of the tubular bodies bias them apart. Latch means oppose the biasing including a collar with a flexible cantilevered stop, such collar being permanently fixed to the distal end of the inner tubular body and having an outer diameter which freely slides within the protective tubular body. The stop hooks against a distal edge of the protective tubular body whereby the bias of the spring means is opposed. Slot means in the protective tubular body near its proximal end receive and capture the stop when pushed by a finger of a hand grasping said protective tubular body.
In addition, a method is provided of constructing a needle stick safety syringe having an inner tubular body terminating in a flange at its proximal end, a plunger, and extended needle at its distal end comprising the following steps. A larger concentric protective tubular body is provided which slides over the inner tubular body of the syringe. The proximal end of the larger tubular body is plugged serving as an abutment holding a coil spring against the flange. A collar is provided with a flexible cantilevered stop and an inner diameter capable of being permanently affixed to the distal end of the syringe body. The collar has an outer diameter which will freely slide in the protective tubular body. The coil spring is placed on the syringe tube, the plug and subsequently the protective tubular body is slid against the spring bias and the stop is affixed until the cantilevered stop hooks against a distal end of the protective tubular body, whereby pushing the stop allows it to ride against the inside of the protective tubular body which then covers the exposed needle due to the expansion of the coil spring. A slot is provided in the proximal end of the protective tubular body in which the stop is captured thereby limiting expansion of said spring and movement of the protective tube under the bias of the expanding coil spring.


REFERENCES:
patent: 3880163 (1975-04-01), Rikkerskamp
patent: 5147303 (1992-09-01), Martin
patent: 5279582 (1994-01-01), Davison et al.
patent: 5411487 (1995-05-01), Castagna
patent: 5591138 (1997-01-01), Vaillancourt
patent: 5885257 (1999-03-01), Badger

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