Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1999-07-29
2000-07-11
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604198, 604263, 604195, A61M 532
Patent
active
060865660
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns an injection syringe of the type which includes, on the one hand, an elongate syringe body comprising a tube and a front wall equipped with an injection needle, and, on the other hand, a rear actuating plunger which is mounted so as to be displaceable in the tube, which syringe additionally includes a mobile protector, for the injection end of the needle, displaceable between a retracted position in the syringe body, behind the injection end of the needle, and an active protection position in which the front end of the protector is situated in front of the injection end of the needle, the protector and the syringe body including associated projecting and recessed reliefs for maintaining the protector in its active protection position.
A syringe of this type is described, for example, in the document U.S. Pat. No. 5,370,628.
In this document, the mobile protector for the injection end of the needle includes legs penetrating inside the syringe.
The legs include means for snap-locking on the body of the syringe in order to maintain the protector in its active protection position.
However, these snap-locking means afford a relatively weak force for holding the protector. Thus, an axial stress exerted on the protector can cause retraction of the latter inside the syringe body. Such retraction of the protector once more exposes the injection end of the needle, thereby causing risks of accidental stick injuries.
Thus, in the known syringes, the protection of the end of the needle by the protector is unreliable, as the protector can quite easily be pushed back into its retracted position.
The object of the invention is to make available a solution to this problem, in particular limiting the risks of accidental return of the protector to its retracted position.
To this end, the subject of the invention is a syringe of the aforementioned type, characterized in that it includes, inside the syringe body, a member for positive retention of the engagement of the said associated projecting and recessed reliefs when the needle protector is in its active protection position.
The invention will be better understood from reading the following description which is given solely by way of example and in which reference is made to the drawings, in which:
FIG. 1 is a longitudinal cross section through a syringe according to the invention, before use;
FIG. 2 is a detail, on a larger scale, of the zone surrounding the rear end of the needle of the syringe in FIG. 1;
FIGS. 3 to 6 are longitudinal cross sections through the syringe in FIG. 1, at different successive stages of use of the syringe,
FIG. 7 is a detail, on a larger scale, of the zone surrounding the front wall of the syringe after completion of the injection, and
FIGS. 8 and 9 are detailed side views of means provided between the syringe body and the rear actuating plunger.
The injection syringe 10 represented in FIG. 1, with general form of revolution about axis X--X, is a disposable syringe. It is offered ready for use and already containing a medical fluid to be injected. It essentially includes an elongate syringe body 12 and a rear actuating plunger 14 which is mounted so as to be displaceable inside the body 12.
The syringe body 12 is formed by a tube 16 at the front end of which there is fixed a needle holder 18 which bears a front wall 20 of the syringe body. This front wall 20 is equipped with an injection needle 22 passing through it. The latter includes a front injection end 22A projecting from the body. The needle continues axially inside the body 12 as far as a rear or proximal end 22B. The portion of the needle extending inside the syringe body is longer than the section of the needle projecting outside the syringe body.
The tube 16 is made of glass, for example, and has a circular cross section. Its front end is equipped externally with a peripheral flange 24 for holding the needle holder 18. Likewise, at its rear end, the tube 16 includes externally a peripheral flange 24A. Attached to this rear end there is a grip member 25
REFERENCES:
patent: 5026356 (1991-06-01), Smith
patent: 5201719 (1993-04-01), Collins et al.
patent: 5308332 (1994-05-01), Dillard, III et al.
patent: 5370628 (1994-12-01), Allison et al.
patent: 5380286 (1995-01-01), Van Der Haak
patent: 5407436 (1995-04-01), Toft et al.
patent: 5429611 (1995-07-01), Rait
Societe d'Etudes et d'Applications Techniques-S.E.D.A.T.
Yasko John D.
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