OVER-TRAVEL-FREE SYRINGE, IN PARTICULAR FOR ADMINISTERING PASTE-LIKE DENTAL COMPOSITIONS

Abstract

Syringe (1) having a syringe body (5) and a proximal syringe outlet (11) in the syringe body (5) as well as having a syringe plunger (7) being axially (13) movable in the syringe body, having a proximal end and a distal end, wherein an elongate lumen (14) is formed inside the syringe plunger (7) coming from the proximal end (7a) of the syringe plunger (7) until the distal end (7b) of the syringe plunger, in which a movable inner plunger (8) having a proximal end (8a) and a distal end (8b) is arranged.

Claims

1. A syringe (1) having a syringe body (5) and a proximal syringe outlet (11) in the syringe body (5) as well as having a syringe plunger (7) being axially (13) movable in the syringe body, having a proximal end and a distal end, an elongated lumen (14) being formed inside the syringe plunger (7) coming from the proximal end (7a) of the syringe plunger (7) until the distal end (7b) of the syringe plunger, in which a movable inner plunger (8) having a proximal end (8a) and a distal end (8b) is arranged, wherein in that the inner plunger (8), at least in part, on its outer surface, and/or the inner surface of the lumen (14), at least in part, is provided with at least one lubricant so that the force-fit between the outer surface of the inner plunger (8) and the inner surface of the lumen (14) is smaller than the force-fit between the inner surface of the syringe body (5) and the outer surface of the syringe plunger (7).

2. The syringe (1) according to claim 1, wherein the elongated lumen (14) is axially (13) formed in the syringe plunger (7) from the proximal (7a) to the distal end (7b) in the rotationally symmetric syringe plunger, the elongated lumen being formed rotationally symmetrically.

3. The syringe (1) according to claim 1, wherein the proximal syringe outlet (11) in the syringe body (5) is a connector (4) or a part of a connector system (4a).

4. The syringe (1) according to claim 1, wherein a) the syringe plunger (7) has at least one plunger (6) at the proximal end and, at least one sealing lip (15) circumferenting at the outer periphery or an O-ring being arranged at the outer periphery in the proximal region of the syringe plunger (7), and a wing (12) at the distal end, or b) the syringe plunger (7) is present in the form of a piston having, a plunger (6) at the proximal end and, at least one sealing lip (15) circumferenting at the outer periphery or an O-ring being arranged at the outer periphery in the proximal region of the syringe plunger (7) and a wing (12) at the distal end.

5. The syringe (1) according to claim 4, wherein i) the sealing lip (15) and/or the O-ring (15) is provided with at least one lubricant, and/or ii) at least one of the following components comprising the inner plunger (8), sealing lip (15), O-ring (15) and/or the syringe plunger (7), each independently, are made of at least one plastic being provided with at least one additive or a mixture of additives in the matrix, and/or iii) at least one of the following components comprising the inner plunger (8), sealing lip (15), O-ring (15) and/or the syringe plunger (7), each independently, is superficially provided with at least one additive or a mixture of additives to reduce friction between the outer surface of the inner plunger (8) and the inner surface of the lumen (14).

6. The syringe (1) according to claim 4, wherein i) the syringe body (5), the syringe plunger (7), the sealing lip (15), the O-ring (15) and/or the inner plunger (8), each independently, are made of at least one thermoplastic plastic, and/or ii) the syringe plunger and/or the inner plunger, each independently, are made of at least one thermoplastic plastic.

7. The syringe (1) according to claim 1, wherein at least one continuous elongated lumen (14) runs inside the syringe plunger (7) coming from the proximal end (7a) (surface) until the distal end (7b) (surface) of the syringe plunger through the whole syringe plunger (7), in which a movable inner plunger (8) having a proximal end (8a) and a distal end (8b), in particular having a wing (9), is arranged.

8. The syringe (1) according to claim 1, wherein a cannula (2a), having a connector (4b) or having a part (4) matching at the part (4a) of the connector system, is arranged at the proximal syringe outlet (11), at the connector (4) or at the part of a connector system (2a).

9. The syringe (1) according to claim 1, wherein the syringe body (7) with the inserted syringe plunger (7) being axially movable has a volume of 0.01 ml to 2 ml, in particular or the volume amounts to 0.2 ml to 1.5 ml.

10. The syringe (1) according to claim 1, wherein the friction (A) between the syringe plunger (7) and the syringe body (5) is greater than the friction (B) of the inner plunger (8) in the lumen (14) of the syringe plunger (7), friction (A) being 10% greater than friction (B), or friction (A) being 50% greater than friction (B).

11. The syringe (1) according to claim 1, wherein a) the distal end (7b) of the syringe plunger (7) has a wing (12) made of thermoplastic plastic, and/or b) the proximal end (7a) of the syringe plunger (7) has, proximally and/or in the proximal region at the outer periphery, a circumferential sealing lip or an O-ring, in particular the sealing lip or the O-ring isbeing made of a thermoplastic plastic, elastomer or a thermoplastic elastomer.

12. The syringe (1) according to claim 11, wherein a) the wing (9) of the inner plunger (8) has a lateral cam at the distal end (8b), being engaged into a recess in the wing (12) of the syringe plunger (7) inside the distal end in the lumen (14), or b) a lateral cam is provide at the distal end (7b) inside the lumen of the wing (12) of the syringe plunger (7), being engaged into a recess in the wing (9) of the inner plunger (8) outside at the distal end (8b), in the state of storing the syringe, or c) the syringe plunger (7) is formed as being at least one piston having at least one lateral cam at the distal end (7b) inside the lumen (14), being engaged into a recess at the outside of the inner plunger (8) at the distal end (8b), in the state of storing the syringe, or d) the inner plunger (8) is formed as at least one piston having at least one cam on the outside, being engaged into a recess in the syringe piston inside the lumen (14), in the state of storing.

13. A kit comprising a syringe (1) according to claim 1, wherein the syringe is filled with a fluid or pasty pharmaceutical or dental composition, with a dental fissure sealant, gingiva retraction past, astringent, a dental glue, a self-etching adhesive, a tissue glue, with a cyanoacrylate skin glue, gluten protein solution, thrombin solution with calcium chloride, pharmaceutical active agent, optionally an anaesthetic or antibiotic.

14. (canceled)

15. (canceled)

16. The syringe (1) according to claim 6, wherein i) the syringe body (5), the syringe plunger (7), the sealing lip (15), the O-ring (15) and/or the inner plunger (8), each independently, are made of at least one thermoplastic plastic, comprising thermoplastic elastomers, polyethylene, polypropylene, polyacetal, optionally POM, PBT, PET, PETP, PA and/or PTFE, and/or ii) the syringe plunger and/or the inner plunger, each independently, are made of at least one thermoplastic plastic, comprising thermoplastic elastomers, polyethylene, polypropylene, polyacetal, optionally POM, PBT, PET, PETP, PA and/or PTFE, and the plastic comprising at least one additive or a mixture of additives in the matrix, at least one lubricant or a mixture of lubricants to reduce the friction, at least one oleamide, erucamide ((Z)-docos-13-enamide), ethylene bis-oleamide and/or stearyl erucamide ((Z)-N-octadecyldocos-13-enamide), solid lubricants, optionally polytetrafluoroethylene (PTFE), molybdenum disulfide (MoS), boron nitride (BN), silicone oil or further oily to waxy substances, and/or iii) the syringe plunger and/or the inner plunger, each independently, are made of at least one thermoplastic plastic, comprising thermoplastic elastomers, polyethylene, polypropylene, polyacetal, such as POM, PBT, PET, PETP, PA and/or PTFE, and the plastic is superficially provided with at least one additive or a mixture of additives, at least one lubricant or a mixture of lubricants to reduce the friction, with at least one oleamide, erucamide ((Z)-docos-13-enamide), ethylene bis-oleamide and/or stearyl erucamide ((Z)-N-octadecyldocos-13-enamide), solid lubricants, optionally polytetrafluoroethylene (PTFE), molybdenum disulfide (MoS), boron nitride (BN), silicone oil or further oily to waxy substances.

Description

[0052] The following figures clarify the invention in more detail without limiting the invention to the exemplary embodiments.

[0053] The figures show:

[0054] FIG. 1a, 1b: syringes 1 with syringe body 5 and syringe plunger 7 with syringe outlet 11 in the form of a connector 4 according to the state of the art

[0055] FIG. 2a, 2b, 2c: syringe 1 according to the invention with syringe outlet 11 in the form of a connector 4 or a connector system 4a with syringe plunger 7 with lumen 14 and inner plunger 8

[0056] FIG. 3: syringe 1 with cannula 2a and closure 10

[0057] FIGS. 1a and 1b, disclose syringes 1 according to the state of the art. The syringes 1 have a syringe body 5 with syringe plunger 7 or piston with piston base 7 with distal wing 12. At the syringe in FIGS. 1a and 2a, connector 4 is shown as being a Luer lock connector. In FIG. 1b, syringe body 5 is shown as being a sleeve with syringe outlet 11 as being a connector 4 with attachment 2 in the form of a cannula 2a. Composition 3 is filled-in in syringe body 5. Proximal plunger 6 possibly with sealing lip 15 or proximal piston base 6 together with syringe plunger 7 and distal wing 12 serves for pressing out the composition 3. Since composition 3 is to be discharged through a cannula having a very small diameter, high internal pressure is build up inside syringe body 5 leading to post-run of the composition from the cannula after application, although no more force is exerted to syringe plunger 7.

[0058] FIGS. 2a, 2b and 2c, show syringes 1 according to the invention having a syringe body 5 and a syringe outlet 11 in the geometry of a connector 4 with attached attachment 2, here a cannula 2a with an own connector. A pasty composition 3 is stored in the syringe body 5, which is to be discharged from the cannula 2a having a very small inner diameter by means of the syringe plunger 7. Syringe plunger 7 may have a proximal plunger 6 in the proximal region at proximal end 7a as well as a sealing lip 15 in the proximal region. The user jointly exerts a force on both wings 9 and 12 at distal end 8b of the inner plunger 8 and distal end 7b of the syringe plunger 7, which is sufficient to discharge an amount of the composition for application from the cannula. After application, the user may lay syringe 1 down. Due to the internal pressure build up in the syringe body 5, the inner plunger 8 can axially be moved inside the syringe plunger 7 to distal, in particular along the longitudinal axis 13 of the syringe plunger and of the inner plunger. In so doing, the pressure is released and the composition no longer flows out of the cannula, but can relieve inside the syringe body. In this position, proximal end 7a of syringe body 7 lays before proximal end 8a of inner plunger 8, as shown in FIG. 2c. If necessary, the user may now insert distal end 8b of inner plunger 8 back into syringe plunger 7 for fine application. FIG. 3 shows a syringe 1 with syringe body 3 and a connector 4a to receive a closure 10 with connector 4c as well as an attachment 2 with cannula 2a and connector 4c.

LIST OF REFERENCE NUMERALS

[0059] 1 syringe [0060] 2 attachment, in particular cannula 2a [0061] 3 composition in syringe body [0062] 4 connector, or part of a connector system 4a, connector 4b, 4c member-matching

[0063] member 4a of the connector system, connector at the proximal syringe body having an internal or external thread at the proximal end [0064] 5 syringe body [0065] 6 proximal plunger of the syringe plunger/piston of the syringe piston [0066] 7 syringe piston/syringe plunger, piston with piston base, 7a proximal end of the syringe plunger/piston, 7b distal end of the syringe plunger/piston, [0067] 8 inner plunger, in particular having a distal wing, 8a proximal end of the inner plunger, 8b distal end of the plunger [0068] 9 distal wing of the inner plunger [0069] 10 closure [0070] 11 syringe outlet [0071] 12 distal wing of the syringe piston/syringe plunger [0072] 13 longitudinal axis [0073] 14 elongated lumen [0074] 15 sealing lip, O-ring