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US 6,110,147 AGranted
Self-protected injection syringe
AssigneeSociete d'Etudes d'Applications Techniques-Sedat
InventorEric Perouse
Life of this patent
Estimating the term…
Abstract
The injection syringe (10) includes, on the one hand, an elongate syringe body (12) comprising a tube (16) and a front wall (20) equipped with an injection needle (22), and, on the other hand, a rear actuating plunger (14) mounted so as to be displaceable inside the tube (16). The body (12) additionally has a mobile needle protector (36) which can be displaced, under the effect of the actuating plunger (14) driven into the body (12), between a retracted position, set back from the injection end (22A) of the needle (22), and an active protection position, in which the front end of the protector is situated in front of the injection end (22A) of the said needle (22).
Claims10
In an injection syringe (10;
- 100) of the type including, on the one hand, an elongate syringe body (12;
- 112) comprising a tube (16;
- 116) and a front wall (20;
- 118) equipped with an injection needle (22;
- 120), and, on the other hand, a rear actuating plunger (14;
- 114) mounted so as to be displaceable inside the tube (16;
- 116), the improvement wherein:
- said syringe is equipped with a mobile needle protector (36, 140) which is displaceable in relation to the body (12;
- 112), under the effect of the actuating plunger (14;
- 114) being actuated and driven into the body (12;
- 112), and during this actuation, between a retracted position, set back from the injection end (22A;
- 120A) of the needle (22;
- 120), and an active protection position, in which the front end of the protector is situated in front of the injection end (22A;
- 120A) of the needle (22;
- 120);
- the body (12) includes at least one opening (34) for the passage of the protector (36), of which a rear end (44), situated inside the syringe body (12), forms a surface for actuation by the rear plunger (14) for forward displacement of the protector (36);
- the injection needle (22) protrudes inside the syringe body (12), and the inside of the tube (16) is provided with a mobile front plunger (62) interposed between the protector (36) and the rear actuating plunger (14), the two plungers delimiting a space for fluid (60) which is to be injected;
- prior to use of the syringe, the front plunger (62) is arranged behind the needle (22), and the front plunger (62) is designed to be punctured by the proximal end (22B) of the needle (22) when the rear plunger (14) is driven in;
- and
- the protector (36) and the body (12) include complementary means (42, 64) for temporarily maintaining the protector (36) in its retracted position, said means being designed to withstand thrust exerted by the front plunger (62) on the protector (36) when the rear plunger (14) is being driven into the tube (16), while the rear plunger (14) is behind the proximal end (22B) of the needle (22) or the front plunger (62).
17 more elements
In an injection syringe (10;
- 100) of the type including, on the one hand, an elongate syringe body (12;
- 112) comprising a tube (16;
- 116) and a front wall (20;
- 118) equipped with an injection needle (22;
- 120), and, on the other hand, a rear actuating plunger (14;
- 114) mounted so as to be displaceable inside the tube (16;
- 116), the improvement wherein:
- said syringe is equipped with a mobile needle protector (36, 140) which is attached to the actuating plunger, and which is displaceable in relation to the body (12;
- 112), under the effect of the actuating plunger (14;
- 114) being actuated and driven into the body (12;
- 112), and during this actuation, between a retracted position, set back from the injection end (22A;
- 120A) of the needle (22;
- 120), and an active protection position, in which the front end of the protector is situated in front of the injection end (22A;
- 120A) of the needle (22;
- 120);
- the mobile needle protector (140) is mounted so as to slide on the outside of the syringe body (112).
13 more elements
In an injection syringe (10;
- 100) of the type including, on the one hand, an elongate syringe body (12;
- 112) comprising a tube (16;
- 116) and a front wall (20;
- 118) equipped with an injection needle (22;
- 120), and, on the other hand, a rear actuating plunger (14;
- 114) mounted so as to be displaceable inside the tube (16;
- 116), the improvement wherein:
- said syringe is equipped with a mobile needle protector (36, 140) which is displaceable in relation to the body (12;
- 112), under the effect of the actuating plunger (14;
- 114) being actuated and driven into the body (12;
- 112), and during this actuation, between a retracted position, set back from the injection end (22A;
- 120A) of the needle (22;
- 120), and an active protection position, in which the front end of the protector is situated in front of the injection end (22A;
- 120A) of the needle (22;
- 120);
- the injection needle (22;
- 120) protrudes inside the syringe body (12;
- 112), and the rear plunger (14, 114) is equipped, opposite the proximal end (22B;
- 120B) of the needle (22;
- 120), with a sealing membrane (58;
- 138) which is punctured by the proximal end (22B;
- 120B) of the needle (22;
- 120) once the plunger (14;
- 114) has been driven into the body (12;
- 112);
- the rear plunger (14;
- 114) is connected to an actuating rod (46;
- 132) including an axial recess (50;
- 136) for receiving the proximal end (22B;
- 120B) of the needle (22;
- 120), arranged behind the said membrane (58;
- 138);
- and
- said recess (50;
- 136) is delimited by a solid wall (52) equipped with one or more calibrated vents (54) for communication with the surrounding atmosphere.
32 more elements
Dependencies are inferred from the claim text.