Compressible syringe

Details Compressible syringe Compressible syringe

1997-09-08

2001-12-25

Kennedy, Sharon (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

Reexamination Certificate

active

06332876

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to a compressible syringe and more particularly relates to an improved pre-filled or liquid-filled compressible syringe.
BACKGROUND OF THE INVENTION
Compressible syringes, particularly molded compressible syringes, are generally known in the medical device art. Typical uses of such syringes include body irrigation such as bladder and wound irrigation and the dispensing or injection of liquids such as sterile water, saline solutions, liquid pharmaceuticals and other liquids, or semi-viscous materials capable of being dispensed from a compressible syringe, into, for example, a surgical wound or cavity.
A collapsible ampule is disclosed in U.S. Pat. No. 3,340,869 to Bane, patented Sep. 12, 1967, such ampule includes a bellows end section wherein the diameter of the bellows end section is larger than the diameters of the remaining bellows section and wherein the wall thickness of the rear wall of the bellows end section is less than the thickness of the forward wall of the bellows end section wherein upon axial compression of the bellows the bellows end section collapses into an inverted position with the rear wall lying close against the inner surface of the forward wall and having an inherent over-center bias which provides yielding resistance to initial displacement thereof out of the inverted fully collapsed position in the direction to expand the bellows section of which it forms a part. A one-piece disposable liquid-filled syringe is disclosed in U.S. Pat. No. 4,411,656 to Cornett, patented Oct. 25, 1983. The syringe disclosed in this patent includes a cap which an be removably placed over the tip of the syringe between uses to maintain the sterility of the contents of the syringe.
A one-piece molded syringe with tethered cap is disclosed in U.S. Pat. No. 2,242,422 to Schneberger et al., patented Sep. 7, 1993. The compressible syringe disclosed in this patent includes a fracturable closure seal formed integrally with the tip of a nozzle and which seal includes a closure cap which can be replaced over the nozzle tip after being removed to maintain the sterility of the syringe contents. The closure seal is connected to the syringe body by a tether and projections are provided on the syringe for engaging a correspondingly shaped cavity provided in the closure seal whereby the closure seal may be removably fastened to the syringe body during disuse.
SUMMARY OF THE INVENTION
A syringe having a hollow body including a bellows and a nozzle through which liquid contained in the bellows is ejected upon compression of the bellows, the bellows including at least one ring or bellows section including a rearward frusto-conical wall and a forward frusto-conical wall and which frusto-conical walls converge in an apex with the rearward wall being at a first included angle with respect to a plane perpendicular to the longitudinal axis of the syringe and intersecting the apex and with the forward frusto-conical wall being at a second included angle with respect to the plane and the first included angle may be greater than the second included angle. The thickness of the rearward frusto-conical wall may be greater than the thickness of the forward frusto-conical wall.
Further the bellows may include a plurality of rings which increase in diameter successively from a closed rear wall toward a forward nozzle.
Still further, the syringe may include a fracture closure seal formed integrally with the syringe nozzle and the closure seal may be connected to the hollow body of the syringe by an elongate pliable tether to prevent separation of the seal from the body.


REFERENCES:
patent: 3473524 (1969-10-01), Drewe
patent: 4262669 (1981-04-01), Sneider
patent: 5242422 (1993-09-01), Schneberger et al.

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