SYRINGE, SYRINGE BODY AND METHOD FOR THE PRODUCTION THEREOF

Abstract

The disclosure relates to a syringe, comprising a syringe body with a nozzle and a threaded connection. The syringe body comprises a side wall and a front wall, wherein the syringe body comprises a cycloolefin as a first material, at least in portions. The first material forms an internal wall of the syringe body. The threaded connection comprises, at least in portions, as a second material a material other than the cycloolefin, wherein the first and the second material are integrally bonded to one another. The second material extends in the region of the front wall at least in portions over the first material, so that the front wall comprises, at least in portions, a two-layer region. The first and the second material in the two-layer region have a mutually engaging structure.

Claims

1. A syringe body for a syringe, comprising: a syringe main body having a side wall, having a front wall and a nozzle arranged on a front side of the front wall, wherein the syringe main body comprises, at least in portions, a cycloolefin as a first material, which forms at least one internal wall of the syringe main body, wherein a connection piece with a threaded connection is arranged with a rear side on the front side of the front wall of the syringe main body and the connection piece, at least in portions, comprises as a second material, a material other than the first material, wherein the syringe main body and the connection piece are integrally bonded to one another to form the syringe body, and wherein a structure on the front side of the front wall of the syringe main body and a complementary structure on the rear side of the connection piece engage into one another.

2. The syringe body according to claim 1, wherein the connection piece is provided as a separate part, which is mounted onto the syringe main body.

3. The syringe body according to claim 1, wherein the connection piece is molded onto the syringe main body.

4. The syringe body according to claim 1, wherein the front side of the front wall of the syringe main body and the rear side of the connection piece are integrally bonded to one another.

5. The syringe body according to claim 1, wherein the cycloolefin is at least one polymer selected from a group consisting of cycloolefin copolymer, cycloolefin polymer and crystal clear polymer.

6. The syringe body according to claim 5, wherein the structure on the front side of the front wall of the syringe main body is formed as a profile with a plurality of protrusions and/or depressions.

7. The syringe body according to claim 1, wherein the structure on the front side of the front wall of the syringe main body has at least one web and/or one groove, which extends from the nozzle at least in portions in the direction of the side wall.

8. The syringe body according to claim 1, wherein the structure on the front side of the front wall of the syringe main body is formed, at least in portions, in a fan-like and/or star-like manner.

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 structure on the front side of the front wall of the syringe main body is delimited by a radially circumferential web.

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 1, wherein a ratio of structure depth to structure width is over 0.1.

13. A syringe, comprising a syringe body according to claim 1, further comprising a stopper, with which the nozzle is sealed, a plunger and a plunger rod for delivering the medical fluid via the nozzle.

14. The syringe according to claim 13, wherein the syringe is packaged in an oxygen-impermeable outer package together with an oxygen absorber.

15. A method for manufacturing a syringe body for a syringe according to claim 1, comprising the steps: injecting the syringe main body of the cycloolefin as the first material, wherein the structure with depressions is formed in the front wall of the syringe main body, molding a connection piece having the threaded connection of the second material onto the front wall, wherein the depressions of the structure are filled with the second material such that the structure on the front side of the front wall of the syringe main body and the complementary structure formed on the rear side of the connection piece engage into one another.

16. The syringe body according to claim 12, wherein the ratio of structure depth to structure width is over 0.25.

17. The syringe body according to claim 12, wherein the ratio of structure depth to structure width is under 1.

18. The syringe body according to claim 17, wherein the ratio of structure depth to structure width is under 0.5.

19. The syringe body according to claim 1, wherein the ratio of structure depth to structure width is under 1.

20. The syringe body according to claim 19, wherein the ratio of structure depth to structure width is under 0.5.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0079] The subject matter of the invention will be explained in more detail below on the basis of FIG. 1 to FIG. 10 with reference to exemplary embodiments.

[0080] FIG. 1 is an axial sectioned view of a syringe according to a first exemplary embodiment of the invention.

[0081] FIG. 2 shows an alternative exemplary embodiment of a syringe.

[0082] FIG. 3 is a perspective view of the head piece of the syringe or of the syringe body.

[0083] FIG. 4 is a perspective view of the head piece of the syringe main body or of the syringe body without attached connection piece.

[0084] FIG. 5 is a perspective view, wherein the connection piece is represented as a transparent grid.

[0085] FIG. 6 is a sectioned view along the line B according to FIG. 5.

[0086] FIG. 7 is a sectioned view along the line C according to FIG. 5.

[0087] FIG. 8 and FIG. 9 are schematic views of alternative structures.

[0088] FIG. 10 is a flow diagram of the method steps according to an exemplary embodiment of the method according to the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

[0089] FIG. 1 shows in an axial sectioned view an exemplary embodiment of a syringe 1 according to the invention, wherein in this view only the syringe body 2, but not plunger and plunger rod are represented.

[0090] The invention is intended for syringes with virtually any desired volume, in particular of 1 ml to 100 ml.

[0091] In the exemplary embodiment according to FIG. 1, a relatively large syringe 1 is represented in particular with an inner volume 3 of roughly 50 ml.

[0092] The syringe 1 comprises a nozzle 101 which is preferably formed conically. A threaded connection 201 having an internal thread extends around the nozzle 101. This concerns in particular a male Luer lock connection.

[0093] It can already be discerned in this sectioned view that in the region of the front wall 4 of the syringe body 2, a two-layer structure of two materials is present (see also FIGS. 3 and 4). In the exemplary embodiment shown, the side wall of the syringe main body is also formed in a two-layered manner and is covered with the second material.

[0094] The syringe body 2 comprises a syringe main body 100, which comprises the nozzle 101 and a connection piece 200, which comprises the threaded connection 201.

[0095] The side wall 102 of the syringe main body 100 is formed by a first material. The first material is provided by cycloolefin. The second material is also transparent.

[0096] FIG. 2 is an axial sectioned view of an alternative embodiment of a syringe 1. 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 remains unchanged, however. The dimensions of the connection, consisting of nozzle 101 and threaded connection 201, do not differ from the exemplary embodiment according to FIG. 2. Therefore, the threaded connection 201 has a significantly larger diameter in relation to the maximum diameter of the syringe body 2.

[0097] FIG. 3 shows, in a perspective view, the head piece of a syringe 1 according to a further exemplary embodiment of the invention.

[0098] The syringe body 2 is formed of the syringe main body 100 and the connection piece 200, which is preferably molded onto the syringe main body 100. The connection piece 200 is formed of a different material to the syringe main body 100. The connection piece 200 is formed by a second material. The mentioned second material is a material other than the first material, for example polypropylene.

[0099] The connection piece 200 comprises a front wall 202, which reaches up to the side wall 102 of the syringe main body 100. The threaded connection 201 having an internal thread extends around the nozzle 101, which is part of the syringe main body 100 and which is therefore also formed of the first material, namely of a cycloolefin.

[0100] FIG. 4 shows in a corresponding perspective view only the syringe main body 100 of cycloolefin. The front wall 103 of the syringe main body 100 comprises a structure 104, which is preferably provided by the injection molding.

[0101] In this exemplary embodiment, the structure 104 of the front wall 103 comprise a plurality of rings 105a-105n extending concentrically around the nozzle 101, which are formed here as protrusions.

[0102] These rings 105a-105n are interrupted by a plurality of radially extending grooves 106, which form a torsion-proof connection in cooperation with the molded connection piece 200.

[0103] FIG. 5 is a perspective view, wherein the connection piece 200 is now illustrated as a transparent grid.

[0104] In this view, the two-layer region of the front wall of the syringe body 2 is represented, which is formed of the cycloolefin of the syringe main body 100 and a layer of the connection piece 200 of the second material, in particular of polypropylene, arranged on top of it.

[0105] The mutually engaging structure is located inside the two-layer region and is formed by the structure 104 of the first material into which the structure 208 of the second material engages.

[0106] The mutually engaging structure formed according to the invention is thus, as shown in particular in the detailed representation according to FIG. 6 along the section line B according to FIG. 5, formed by the structure 104 of the syringe main body 100 and by the structure 208 of the connection piece 200 engaging into this structure 104.

[0107] The structure 104 of the syringe main body 100 comprises a plurality of teeth 105a-105n in a radial sectioned view. The structure 104 is formed in this exemplary embodiment in an axial section as a kind of saw tooth profile. Correspondingly formed teeth of the second material of the connection piece 200 engage between the teeth 105a-105n.

[0108] The second material extends up to the edge 109 of the syringe body 2 such that the entire side wall 102 of the syringe main body 2 is formed of the cycloolefin.

[0109] The structure, both of the syringe main body 100 and of the connection piece 104/208, is in this exemplary embodiment formed as a regular structure, in which the distance from peak to peak or trough to trough is defined by the distance a between two peaks or two troughs. The mentioned peaks and troughs are also designated as protrusions or depressions.

[0110] The structure 104/208 also has a maximum depth t, which is defined by the vertical distance between the tip of a protrusion and the bottom of a depression.

[0111] The threaded connection 201 with the teeth 203 of the internal thread, which is opposite the nozzle 101, merges via a bead 205 in the region of the second material into the front wall 202 of the connection piece 200. This increases the mechanical strength in this region such that the risk of the threaded connection 201 breaking is reduced.

[0112] Inside the threaded connection 201, the base 207 of the threaded connection 203 reaches up to an inner corner 107, at which the front wall 103 of the syringe main body 100 merges into the nozzle 101. The nozzle 101 is therefore not covered by the second material. As a result, the material of the connection piece 200 does not come into contact with the medical fluid when used as intended.

[0113] FIG. 7 is a sectioned view along the line C of FIG. 5. The section now runs through a radial groove 106 of the syringe main body 100. The groove 106 is formed by the teeth or rings 105a-105m of the structure 104 being interrupted in a radially extending strip. A corresponding web 209 of the second material has been formed in the groove 106. This web forms a torsion-proof connection in cooperation with the groove 106.

[0114] In this exemplary embodiment, a ring 105n reaching directly to the threaded connection 201 is not recessed by the groove 106. In the region of the web 209, this ring also forms a deflection point via which the introduction of stresses into the region of the web 209 is reduced.

[0115] The syringe main body 100 is also provided with a bead 108 at the edge. The upper side 206 of the connection piece 200 or of the front wall 4 of the syringe main body 2 aligns with the upper edge 109 of the side wall 102.

[0116] FIG. 8 and FIG. 9 show in a schematic top view of the front wall 4 of the syringe body 2 alternative embodiments of a structure.

[0117] According to the exemplary embodiment represented in FIG. 8, the syringe main body 100 comprises a structure 104, which is formed of a plurality of protruding nubs, which are distributed evenly in the two-layer region. This structure 104 is filled by the second material of the connection piece 200 and thus forms a form-fitting connection between the syringe main body 100 and the connection piece 200. A complementary configuration with indentations is also possible. The nubs would thereby be formed by the second material of the connection piece 200.

[0118] According to the exemplary embodiment represented in FIG. 9, the structure 104 comprises triangles, which are directed radially with the tip towards the middle point, as protrusions or depressions.

[0119] FIG. 10 is a flow diagram with the method steps according to an exemplary embodiment of the method according to the invention.

[0120] First, a syringe main body 100 with a nozzle 101 of a cycloolefin is injected. An injection-molding tool is used here which is formed in such manner that a front wall 103 of the syringe main body 100 comprises a structure 104.

[0121] Then, a connection piece 200 with a threaded connection 201 of a second material, in particular of a polypropylene, is molded onto the syringe main body 100.

[0122] The syringe body 2 now consisting of two different materials is characterized by a high strength of the connection, wherein the entire internal wall of the syringe main body 2 is formed of the cycloolefin.

LIST OF REFERENCE NUMERALS

[0123] 1 Syringe [0124] 2 Syringe body [0125] 3 Inner volume [0126] 4 Front wall [0127] 100 Syringe main body [0128] 101 Nozzle [0129] 102 Side wall [0130] 103 Front wall [0131] 104 Structure of the syringe main body [0132] 105a-105n Ring/tooth [0133] 106 Radial groove [0134] 107 Corner [0135] 108 Bead [0136] 109 Edge [0137] 200 Connection piece [0138] 201 Threaded connection [0139] 202 Front wall [0140] 203 Tooth [0141] 205 Bead [0142] 206 Upper side [0143] 207 Base [0144] 208 Structure of the connection piece [0145] 209 Web