Finger brace for hypodermic syringe

Details Finger brace for hypodermic syringe Finger brace for hypodermic syringe

2000-06-26

2001-10-02

Mendez, Manuel (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

Reexamination Certificate

active

06296625

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a hypodermic syringe. More particularly this invention concerns a subassembly comprising a finger brace and syringe body.
BACKGROUND OF THE INVENTION
A standard hypodermic syringe as described in commonly owned U.S. Pat. No. 5,320,603 has a cylindrically tubular body having a front end closed by a plug formed with a central passage extending along the axis of the body and a rear end provided with a piston longitudinally axially displaceable in the body. The read end carries a transversely projecting finger brace. A quantity of liquid to be injected is held in the body between the piston and the plug and a needle is fitted to the passage at its front end so that forward displacement of the piston by a plunger forces the liquid out of the body through the needle. The syringe is typically held with two of the user's fingers engaged on opposite sides of the rear end of the syringe with forward-facing surfaces of the brace and the user's thumb bearing on the rear end of the plunger.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved hypodermic syringe
Another object is the provision of such an improved hypodermic syringe which overcomes the above-given disadvantages, that is which has an improved finger brace that is particularly constructed to act as a stop limiting the stroke of the plunger.
SUMMARY OF THE INVENTION
A syringe assembly has a tubular syringe body centered on and extending along an axis and formed at a read end with a radially outwardly projecting rim. A finger brace of limitedly elastically deformable material is formed with an end plate bearing axially forward on the rear end and formed with a central hole. A tube projects axially forward from the hole of the plate into the body at the rear syringe end, and a collar extends axially forward from the plate outside the tube and is formed with a plurality of angularly spaced and radially inwardly projecting teeth engaged under the rim. The plate is also formed adjacent each of the teeth with an axially throughgoing and angularly elongated slot defining a radially elastically deflectable side portion carrying the respective tooth.
Thus such a finger brace can be snapped in place over the rear end of the syringe body and will remain solidly locked to the body. The tube extending down into the syringe body serves as a stop limiting rearward travel of a piston carried on a plunger extending axially through the hole in the plate. The length of the tube can be varied to set different strokes for the piston so that, for instance, for blood-collection the stroke can be limited to the right volume for the sample needed. Furthermore the finger brace according to the invention is ideal for mass production of prefilled syringes since it can be fitted with ease to the syringe bodies. The stop tube automatically centers the brace while it is pushed on the body and its side portions are deflected outward to allow the teeth to snap into place under the rim of the syringe body.
According to the invention the plate is generally rectangular and the collar has two such teeth and side portions diametrically opposite each other. Each side portion is straight and the collar is formed with a pair of corner portions connecting the side portions to the rest of the collar. The corner portions are arcuate.
The body in accordance with the invention has an inside diameter generally corresponding to an outside diameter of the tube. In addition the tube has a front edge lying axially forward of a front edge of the collar. The rim is oval and a rear face of the plate is formed around the hole with a frustoconical bevel. The end plate, tube, and collar are unitarily formed with one another, normally of a durable plastic.


REFERENCES:
patent: 5320603 (1994-06-01), Vetter
patent: 5338309 (1994-08-01), Imbert
patent: 5419775 (1995-05-01), Haffner et al.
patent: 5897532 (1999-04-01), Spallek et al.
patent: 197 23 851 (1998-08-01), None

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