US 4,655,751 A · Liquid dispensing and receiving syringe

Abstract

The liquid dispensing and receiving syringe includes an elongated preferably cylindrical transparent container open at its front and rear ends and defining a central cavity for holding liquid. A rearwardly extending plunger is slideably secured in the rear end of the cavity for dispensing liquid out the front end of the container and through a hollow needle or nozzle secured to the container front end and for sucking liquid into the cavity from the needle. A concentric protective shell is connected to and spaced outwardly from the container sidewall and is slideable between a first needle-expository position and a second needle-covering position. The shell has windows and/or a grid to permit viewing of the container. A number of spacer ears spaced on the container's outer surface and/or the shell's inner surface may temporarily or permanently lock in mating pockets and/or frictionally slide in longitudinal grooves in the container outer surface. The shell may be resilient and flexible to allow temporary distortion thereof to move the ears in and out of the pockets and/or to permit breaking of the needle to disable it. The container sidewalls may include transverse scorelines to permit easy breaking of the container to prevent its reuse. The syringe is compact, disposable, inexpensive and offers improved safety.

Drawings

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Drawings

Claims14

Dependent claims

An improved liquid receiving and dispensing syringe, said syringe comprising, in combination:

(a) an elongated container open at its front and rear ends and containing sidewalls defining a generally central cavity adapted to hold a dispensible liquid;
(b) an elongated needle containing a central longitudinal liquid-dispensing passageway extending throughout the length thereof, said needle being the front end of said container and extending forwardly therefrom, said needle being in communication with said container cavity for delivery of liquid therefrom and thereinto;
(c) the plunger slideably disposed in said cavity extending rearwardly from the rear end of said container and adapted to force liquid forwardly from said cavity out through said needle, and to such liquid into said cavity;
and
(d) a protective shell connected to, slideably disposed around and normally spaced outwardly from said container sidewalls, and movable between a first rear position exposing said needle and a second front position concealing said needle to prevent inadvertent injury by contact with said needle and to facilitate disposal of said syringe,
(e) wherein spacer means are secured to at least one of the inner surface of said shell and the outer surface of said container to facilitate at least one of the functions of releasably locking said shell in at least one of said first and second positions and sliding said shell between said first and second positions,
(f) wherein said spacer means comprises a plurality of inwardly directed ears projecting from the inner surface of said shell,
(g) said container having a plurality of retaining pockets on the outside surface thereof near both the front end and the rear end of said container,
(h) said ears being releasably receivable within said retaining pockets within the outer surface of said container, whereby said ears are positioned within the pockets at the rear end of the container when the needle is not covered by said shell, and whereby said ears are positioned within the pockets at the front end of said container when the needle is covered by said shell, such ears and pockets serving to inter-lock the container and the shell to prevent relative movement thereof.

6 more elements

Dependencies are inferred from the claim text.

Description1,862 words

Summary533 words

#1. Field of the Invention

#The present invention generally relates to liquid dispensers and receivers and, more particularly, to an improved liquid dispensing and receiving syringe.

#2. Prior Art

Brief description of the drawings6 figures

#FIG. 1 is a schematic vertical cross-section of a first preferred embodiment of the improved syringe of the present invention;

#FIG. 2 is a schematic front elevation of the syringe of FIG. 1, showing the needle cap in FIG. 2a and the remainder of the syringe in FIG. 2b;

#FIG. 3 is a schematic front elevation, partly broken away, of a second preferred embodiment of the improved syringe of the present invention;

Detailed description1,193 words

#FIGS. 1 and 2.

#Now referring more particularly to FIGS. 1 and 2 of the accompanying drawings, a first preferred embodiment of the improved syringe of the present invention is schematically shown therein in vertical cross-section in FIG. 1 and in elevation in FIG. 2. Thus, syringe 10 is shown, which comprises an elongated generally cylindrical container or Tube 12 of transparent plastic or glass or the like having an open rear end 14 with transverse rear flange 15, an open front end 16 and a sidewall 18 defining therewith a central liquid storage space 20.

#An elongated cylindrical plunger 22 of metal, plastic, glass or the like is slideably received into space 20 through end 14. Plunger 22 includes a plunger shaft 24 with a generally cone-shaped front tip 26, preferably of flexible resilient, plastic rubber or the like and configured to conform to the interior front portion 28 of tube 12. Plunger 22 also includes a rear transverse handle 30.

Facts

Application

06/829,330Filed 14 Feb 1986

Granted

7 Apr 1987

Term ended

14 Feb 2006

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification4 codes

A61M 5/50
Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning…:…
A61M 5/3243
Means for protection against accidental injuries by used needles: being axially-extensible, e.g. protective sleeves coaxially slidable on the…
A61M 2005/3246
Constructional features thereof, e.g. to improve manipulation or functioning: being squeezably deformable for locking or unlocking purposes, e.g.…
A61M
Devices for delivering substances into the body

Liquid dispensing and receiving syringe

Life of this patent

Liquid dispensing and receiving syringe

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims14

Description1,862 words

Drawings

Classification4 codes

Life of this patent

Description1,862 words