SYRINGE AND SYRINGE BODY

Abstract

The invention relates to a syringe body having a nozzle and a threaded connection. The syringe body consists of an inner part and an outer part, the inner part comprising, at least in regions, a cycloolefin, in particular a cycloolefin copolymer or a cycloolefin polymer, as a first material. The first material forms an inner wall of the syringe body. The threaded connection of the outer part comprises, at least in regions, a material different from the cycloolefin as a second material. The invention further relates to a syringe having the syringe body.

Claims

1. A syringe body for a medical syringe, comprising: a nozzle, a threaded connection, and an inner part, which forms an inner wall of the syringe body and which comprises, at least in regions, a cycloolefin as a first material, the inner part including a side wall, wherein the threaded connection is formed as part of an outer part of a plastic, which comprises, at least in regions, a material different from the cycloolefin as a second material, wherein the outer part extends, at least in regions, around the side wall of the inner part.

2. The syringe body according to claim 1, wherein the outer part extends around the entire side wall of the inner part and/or in that a grip of the syringe body is part of the outer part.

3. The syringe body according to claim 1, wherein the inner part and the outer part are inserted into one another and, at least in regions, are connected in a materially-bonded manner.

4. The syringe body syringe according to claim 1, wherein the inner part is overmolded with the outer part.

5. The syringe body according to claim 1, wherein a wall thickness of the inner part in the region of the side wall and/or an end wall is 0.3 to 3 times, a wall thickness of an adjoining wall of the outer part.

6. The syringe body according to claim 1, wherein a front side of an end wall of the inner part comprises a structuring into which a complementary structuring of the outer part engages.

7. The syringe body according to claim 6, wherein the structuring of the inner part and/or the complementary structuring of the outer part is in each case formed as a profile with a plurality of protrusions and/or depressions.

8. The syringe body according to claim 6, wherein the structuring of the inner part and/or the complementary structuring of the outer part has at least one radially extending groove or a radially extending web.

9. The syringe body according to claim 1, wherein a layer of the second material is formed thickened around the threaded connection compared to a radially adjoining region of the layer of the second material.

10. The syringe body according to claim 1, wherein the second material has a higher notch impact toughness than the first material.

11. The syringe body according to claim 1, wherein the second material is softer than the first material.

12. The syringe body according to claim 6, wherein the structuring on the front side of the end wall of the inner part is delimited by a radially circumferential web.

13. A syringe comprising a syringe body according to claim 1.

14. The syringe according to claim 13, wherein the nozzle is sealed with a seal preferably engaging into the nozzle and further comprising a plunger with a plunger rod for delivering a medical fluid through the nozzle.

15. The syringe according to claim 13, wherein the syringe is arranged in an outer packaging impermeable to oxygen.

16. The syringe body according to claim 5, wherein the wall thickness of the inner part in the region of the side wall and/or the end wall is 0.5 to 1.5 times the wall thickness of the adjoining wall of the outer part.

17. The syringe body according to claim 8, wherein the structuring of the inner part and/or the complementary structuring of the outer part has a plurality of radially extending webs and/or grooves.

18. The syringe body according to claim 10, wherein the second material has a notch impact toughness of at least 20% higher than the first material.

19. The syringe body according to claim 18, wherein the second material has a notch impact toughness of at least 50% higher than the first material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0111] The subject matter of the invention will be explained in more detail below on the basis of exemplary embodiments in accordance with FIG. 1 to FIG. 10.

[0112] FIG. 1 is a side view of an exemplary embodiment of a syringe according to the invention.

[0113] FIG. 2 is an axial sectioned view along the line A-A of FIG. 1.

[0114] FIG. 3 is an axial sectioned view of the syringe body.

[0115] FIG. 4 shows an alternative exemplary embodiment of a syringe body.

[0116] FIG. 5 is a detail view of the region D of FIG. 3.

[0117] FIG. 6 is a perspective view of the head piece of the syringe.

[0118] FIG. 7 is a perspective view of the head piece of the inner part.

[0119] FIG. 8 is a top view of the end wall of the syringe body.

[0120] FIG. 9 is a sectioned view along the line B according to FIG. 8.

[0121] FIG. 10 is a sectioned view along the line C according to FIG. 8.

DETAILED DESCRIPTION OF THE DRAWINGS

[0122] FIG. 1 shows, in a side view, an exemplary embodiment of a syringe 1 according to the invention.

[0123] The syringe 1 comprises a syringe body 2 having a threaded connection 5 and a proximal grip 9.

[0124] As represented in the axial sectioned view according to FIG. 2, the syringe body 2 provides an inner volume 3 which is pre-filled with a medical fluid. A gaseous volume in the inner volume 3 compensates for pressure fluctuations and in particular prevents the syringe body 2 from deforming during pressure fluctuations.

[0125] The nozzle 4 is sealed with a seal 9, which preferably engages into the nozzle 4 such that the outer wall of the nozzle 4 does not come into contact with the medical fluid at least in the sealed state.

[0126] Nozzle 4 and threaded connection 5 form the connection of the syringe 1, which is formed in particular as the male Luer lock connection.

[0127] The medical fluid can be delivered through the nozzle 4 via the plunger rod 8 connected to the plunger 6.

[0128] FIG. 3 shows, in an axial sectioned view, only the syringe body 2.

[0129] The syringe body 2 is formed in two parts and comprises an inner part 100 of cycloolefin as well as an outer part 200, which is formed of a mechanically more stable material than the inner part 100, in particular of a polypropylene.

[0130] The threaded connection 5/201 is provided only by the outer part 200.

[0131] The invention is provided for syringes with almost any desired volume, in particular 1 ml to 100 ml.

[0132] In the exemplary embodiment according to FIG. 3, a relatively large syringe, in particular with an inner volume 3 of roughly 50 ml, is represented.

[0133] FIG. 4 is an axial sectioned view of an alternative embodiment of a syringe body 2.

[0134] This exemplary embodiment concerns a relatively small syringe, in particular with an inner volume 3 of roughly 5 ml. The basic structure of the syringe body 2, however, remains unchanged.

[0135] In this case, the dimensions of the connection, consisting of nozzle 4 and threaded connection 5, do not differ.

[0136] Consequently, the threaded connection 5 has a significantly larger diameter in proportion to the maximum diameter of the syringe body 2.

[0137] FIG. 5 is a detail representation of the region D of FIG. 3, i.e. of the proximal end of the syringe body 2.

[0138] The side wall of the syringe body 2 is formed in a two-layered manner and is formed of the side wall 102 of the inner part and of the adjoining side wall 202 of the outer part 200.

[0139] The grip 7/204, in contrast, consists, at least in regions, only of the material of the outer part 200.

[0140] In this embodiment, the inner part 100 has a proximal collar 107, which protrudes into the grip 204 and e.g. the axial positioning in one embodiment, in which inner part 100 and outer part 200 are pushed into one another, has improved or which, in one embodiment where the inner part 100 is overmolded with the outer part 200, makes the grip 6 more rigid.

[0141] FIG. 6 shows, in a perspective view, the head piece of a syringe 1 according to one exemplary embodiment of the invention.

[0142] The syringe body 2 is, as mentioned above, formed of inner part 100 and outer part 200, such that, in this view from the inner part 100, at most the inner wall of the nozzle 4 can be discerned.

[0143] The threaded connection 5/201 with an internal thread extends around the nozzle 4/210, which is formed in a two-layered manner.

[0144] FIG. 7 shows, in a corresponding perspective view, only the inner part 100 of cycloolefin.

[0145] The end wall 103 of the inner part 100 comprises a structuring 104, which has preferably been provided by injection-molding.

[0146] In this exemplary embodiment, the structuring 104 of the end wall 103 comprises a plurality of rings 105a-105n extending concentrically around the nozzle 101 of the inner part 100, which are formed as elevations or protrusions.

[0147] These rings 105a-105n are interrupted by a plurality of radially extending grooves 106, which form a torsion-proof connection in interaction with the outer part 200.

[0148] FIG. 8 is a top view of the distal side of the syringe body 2.

[0149] The end wall of the syringe body 2 comprises a region 7 formed in a two-layered manner, in which the structurings 104, 208 of inner part 100 and outer part 200 engages into one another.

[0150] The structuring engaging into one another formed according to the invention is thus, as in particular shown in the detail representation according to FIG. 9 along the section line B according to FIG. 8, formed by the structuring 104 of the inner part 100 as well as by the structuring 208 of the end wall 211 of the outer part 200 engaging into this structuring 104.

[0151] The structuring 104 of the inner part 100 comprises a plurality of teeth 105a-105n in a radial sectioned view. The structuring 104 is thus formed, in this exemplary embodiment, in an axial section as a saw tooth profile.

[0152] The correspondingly formed teeth of the second material of the outer part 200 engage between the teeth 105a-105n.

[0153] The second material extends around the outer walls of the entire inner part 100.

[0154] The structuring (104/208) is, in this exemplary embodiment, formed as a regular structuring, in which the distance from peak to peak or valley to valley (or protrusion to protrusion or depression to depression), i.e. the structure width, is defined by the distance a between two tips or two valleys.

[0155] The structuring 104/208 also has a maximum depth t, which defines the structure depth, and which defines the vertical distance from the peak tip to valley bottom.

[0156] The threaded connection 201 with the teeth 203 of the internal thread, which is located opposite the nozzle 210, merges via a bead 205 in the region of the second material into the end wall 211 of the outer part 200.

[0157] The mechanical strength is hereby increased in this region such that the risk of the threaded connection 201 breaking is reduced.

[0158] Inside the threaded connection 201, the bottom 207 of the threaded connection 201 reaches up to an inner corner 212 at which the end wall 211 of the outer part 200 merges into the nozzle 210.

[0159] The nozzle 4 is thus formed in a two-layered manner and namely of the nozzle 101 of the inner part 100, which provides the inner wall of the nozzle 4, and of the nozzle 210 of the outer part 200, which provides the outer wall of the nozzle 4.

[0160] FIG. 10 is a sectioned view along the line C of FIG. 8.

[0161] The section now runs through a radial groove 106 of the inner part 100. The groove 106 is formed such that the teeth or rings 105a-105m of the structuring 104 are interrupted in a radially extending strip.

[0162] A corresponding web 209 of the second material is formed in the groove 106.

[0163] This web forms a torsion-proof connection in interaction with the groove 106.

[0164] In this exemplary embodiment, a ring 105n reaching directly to the threaded connection 201 is not recessed by the groove 106.

[0165] In the region of the web 209, this ring also forms a deflection point via which the input of stresses into the region of the web 209 is reduced.

[0166] Inner part 100 and outer part 200 can be connected in a materially-bonded manner, in particular by the inner part 100 being overmolded with the outer part 200. Alternatively, it is possible to connect inner part 100 and outer part 200 to one another by welding or adhering or by a form-fitting and/or force-fitting connection.

[0167] Through the invention, a syringe 1 can be provided which is more stable, in particular less prone to brittle fracture and has improved haptics. The required quantity of cycloolefin can also be reduced.

LIST OF REFERENCE NUMERALS

[0168] 1 Syringe [0169] 2 Syringe body [0170] 3 Inner volume [0171] 4 Nozzle [0172] 5 Threaded connection [0173] 6 Plunger [0174] 7 Grip [0175] 8 Plunger rod [0176] 9 Seal [0177] 10 Two-layer region with structuring [0178] 100 Inner part [0179] 101 Nozzle [0180] 102 Side wall [0181] 103 End wall [0182] 104 Structuring of the inner part [0183] 105a-105n Ring/tooth [0184] 106 Radial groove [0185] 107 Collar [0186] 200 Outer part [0187] 201 Threaded connection [0188] 202 Side wall [0189] 203 Tooth [0190] 204 Grip [0191] 205 Bead [0192] 206 Upper side [0193] 207 Bottom [0194] 208 Structuring of the outer part [0195] 209 Web [0196] 210 Nozzle [0197] 211 End wall [0198] 212 Corner