Disposable syringe
First Claim
1. A disposable syringe, of the type comprising a cylindrical hollow body (2) inside which moves a plunger (3) which, with the end of the body comprising a support (8) for a needle (9), sealingly defines an inner chamber (12) of variable volume, the plunger (3) being connected to the inner end (5) of a plunger stem (4) allowing same to be moved, and means (6, 13) making it possible, on the one hand, to make the plunger (3) integral with the inner end (5) of the plunger stem (4) during the first filling of the inner chamber (12) and, on the other hand, to cause the disconnection of the plunger (3) from the inner end (5) of the plunger stem (4) during any attempt to refill the inner chamber (12), characterized in that the connecting means between the plunger (3) and the stem (4) comprise an intermediate memorization ring (6) formed such that it ensures, during filling, that these two elements (3, 4) are integral, while the injection, that is to say the pressure on the plunger stem (4), causes the intermediate member (6) to be displaced relative to the two elements (3, 4) so that the latter become detached during any second filling attempt.
1 Assignment
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Accused Products
Abstract
A syringe comprising means making it possible to make the plunger (3) integral with the end (5) of the plunger stem (4) during the first filling, and to cause the disconnection between these elements during a refilling attempt.
According to the invention, the connecting means between the plunger (3) and the stem (4) comprise an intermediate memorization member (6) formed such that, during filling, it ensures that these two elements (3, 4) are integral while the injection, that is to say the pressure on the plunger stem (4), causes the displacement of the intermediate member (6) relative to the two elements (3, 4) so that the latter become detached upon any second filling attempt.
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Citations
9 Claims
- 1. A disposable syringe, of the type comprising a cylindrical hollow body (2) inside which moves a plunger (3) which, with the end of the body comprising a support (8) for a needle (9), sealingly defines an inner chamber (12) of variable volume, the plunger (3) being connected to the inner end (5) of a plunger stem (4) allowing same to be moved, and means (6, 13) making it possible, on the one hand, to make the plunger (3) integral with the inner end (5) of the plunger stem (4) during the first filling of the inner chamber (12) and, on the other hand, to cause the disconnection of the plunger (3) from the inner end (5) of the plunger stem (4) during any attempt to refill the inner chamber (12), characterized in that the connecting means between the plunger (3) and the stem (4) comprise an intermediate memorization ring (6) formed such that it ensures, during filling, that these two elements (3, 4) are integral, while the injection, that is to say the pressure on the plunger stem (4), causes the intermediate member (6) to be displaced relative to the two elements (3, 4) so that the latter become detached during any second filling attempt.
Specification