WO2003013972A1

WO2003013972A1 - Closure cap for infusion or transfusion bottles

Info

Publication number: WO2003013972A1
Application number: PCT/EP2002/007452
Authority: WO
Inventors: Albert Louis Victor Jozef Claessens
Original assignee: Helvoet Pharma Belgium N.V.
Priority date: 2001-08-03
Filing date: 2002-07-05
Publication date: 2003-02-20
Also published as: EP1412261A1; DE50207315D1; CN1538925A; US20040217082A1; DE10138191A1; EP1412261B1; DE10138191B4; CN1274561C; JP2004536686A

Abstract

The invention relates to a closure cap (V) for infusion or transfusion bottles, comprising a rubber-type sealing part (1) adapted to the neck of the bottle (3). The closure cap (7) is embodied in such a way that it underpins a bead (5) on the neck of the bottle (3). An top-cap (8) for maintaining the closure cap (7) in a positive fit on the neck of the bottle (3) is also provided. The aim of the invention is to provide a closure cap which has an advantageous design for sterilisation, for example. In order to achieve said aim, the sealing part (1) is retained by the closure cap (7) and is exposed in a direction leading towards the outside of the sealing cap (7) in an area of penetration (17), and the top-cap (8) which also covers the area of penetration (17) is maintained in a first, reversible lock-in position (I) at an axial distance (y) to the area of penetration (8) on the closure cap (7).

Description

Cap for infusion or transfusion bottles

The invention relates to a closure cap for infusion or transfection bottles, with a rubber-like sealing part adapted to the bottle neck, wherein the Nerschluss cap is formed on the bottle neck to form a bead-engaging grip and furthermore an overcap is provided for form-fitting retention of the Nerschluss cap on bottleneck.

From DE-FS 3715175 Cl it is known to secure the sealing part designed into a stopper by a closure cap in the form of the classic metal crimp cap. An opening left in the cover of this cap allows access for a cannula or transfusion set. In the original state, this opening is kept closed with the help of a plastic cover that also forms a germ barrier as an overcap. This plastic lid can be removed with emphasis on will. Target tear lines, which are realized by weakening the material thickness of the plastic cover, have a relieving effect.

In substitution of the device-dependent flanging, DE 4015 510 AI proposes to hold the sealing cap captivating the sealing part in the bulge under the bottle neck and to secure this under-grip by an overcap in the form of a form-fitting holder. The overcap acts like a ripe. It is implemented as a ring slide that can be moved downwards beyond the top of the sealing cap. Knowing these requirements, the invention has set itself the task of forming a generic closure with a view to obtaining an assembly unit that is advantageous in terms of association and accessible for treatment.

This object is achieved first and foremost in the case of a closure with the features of claim 1, the focus being on the fact that the sealing part is caught on the closure cap, that the sealing part is exposed to the outside of the closure cap in a piercing area and that the piercing area is also exposed overcap can be held in a first, reversible locking position with an axial distance to the piercing area on the closure cap.

As a result of such a design, a generic closure of increased utility value is achieved: this is due to the creation of a compilation unit, both with regard to the cohesion of the closure-forming parts and with regard to a defined pre-engagement while maintaining the described distance between the closure cap and the overcap. This gives space for measures regarding sterilization of the closure. The overflowing shifting of the cap over the remaining stroke leads to a defined positive locking of the cap on the bottle neck. The sealing part, too, is associated with its carrier, namely the closure cap, in mechanically sufficient strength, or is trapped thereon. Here, too, the outer, freely exposed surfaces are best accessible for the treatment mentioned. This also applies to the underside of the all-over cap. The reversible locking position defining the distance has, as it were, a response threshold which only releases the further assembly stroke of the overcap when the undercutting grip on the closure cap on the bottle neck has taken place. An abutment is built on. As already indicated, the wall lowers like a locking bolt over the anchoring zone of the closure cap.

The subject matter of the further claims are explained below in relation to the subject matter of claim 1, but may also be of importance in their independent formulation. It is envisaged that the closure cap and the sealing part are manufactured in a two-component injection molding process. The adhesive force to be gained or set from this was found to be sufficient; in any case, the usual mechanical stresses, for example in the context of the sterilization explained above, the transport, the passage of the filling paths, the migration in sorting sections, etc. are not sufficient. On the other hand, the assignment can also be such that a deliberate solution is opened, for example, to separate them according to type. The closure cap is preferably injection molded over the relatively soft, preformed sealing part. This leads to an effect of even independent importance: It happens that the sealing part is under elastic tension against the sealing cap due to shrinkage. This applies, on the one hand, with regard to the cap base which is formed, and also with regard to the perforation-shaped piercing areas, which are also slightly narrower as part of the overall shrinkage. At the same time, this also leads to a welcome clamping hold towards the shaping section of the sealing part. The invention further proposes that the closure cap has tongues in the circumferential direction that are formed like a segment of a circle and provided with a latching bead, which have outside latching configurations for latching the overcap that has corresponding latching projections on a cylinder wall. Regarding the lower gripping tongues, they are single tongues. They are springy evasive. With regard to the latching formations and corresponding latching projections, the structure is based on a zigzag to sawtooth-shaped structure. The invention brings further in proposal that the cylinder wall of the overcap has a latching lug protruding beyond the latching projections of the cylinder wall at its lower, free end for the latching engagement of the closure cap. This brings a thickening of the edge of the cap there and thus a stable back support for the second, basically irreversible locking position of the closure. Then it is further provided that the sealing cap, assigned to a sealing cap cover, has a latching shape for reversible latching with the latching lug of the overcap. The design of the latching shape, assigned to the cover cap cover, creates the greatest possible free space for sterilization with regard to the preassembled unit. Specifically, the latching shape is arranged in a cross section below the top of the sealing cap, ie close to the ceiling. The overcap has a top cap blanket over the piercing area. The accessibility of the piercing area required in use results from simple means in that a tear-open tab extending to the outer edge of the cap cap is formed in the top cap blanket by a line of weakness. The peripheral gripping attachment generally has a separation point here, which advantageously forms the access for the interior of the unit in advance. Appropriately, two diametrically opposed tear tabs each extending to a central region of the overcap top are formed. In addition, it is proposed that a tear-open tab is assigned to a piercing area which is peripherally surrounded by the cover cap cover. The piercing areas are so to speak arranged in an island-like manner in the ceiling field. It is also provided that the overcap is secured against rotation on the closure cap. To create the anti-rotation device, features that are provided can be included from the start. This is concretized in that the rotation lock is achieved by vertical ribs formed on the inside of the cylinder wall of the overcap, which engage in corresponding vertical grooves of the closure cap. In terms of the vertical grooves are the indicated specifications. The relevant embodiment is characterized in that a vertical groove on the closure cap is formed by the separation area between two circular segment-like gripping tongues. Furthermore, an advantageous embodiment consists in the vertical groove continuing up to the top of the cover cap, leaving a residue of the wall of the cover cap. The remainder is the result of a weakly frustoconical transition from the wall of the sealing cap to the sealing cap ceiling. Finally, an advantageous variant of the subject matter of the invention is that the sealing element ends at a radial distance from the inside of the ring wall of the closure cap. Such a peripheral, circumferential annular gap can easily be taken into account in terms of production technology. The contact-free assignment to the inside there can be used if the explained clamping voltage is not to be used in this area and the mutual adhesive surfaces are to be minimized. In addition, the radial distance that extends to the top of the sealing cap can be used to pry out the sealing part for the purpose of separation. The sealing part can be pried out of the shell like an oyster.

The subject matter of the invention is explained in more detail below on the basis of an illustrative embodiment. It shows:

1 shows the closure according to the invention, assigned to a bottle neck, in an enlarged representation, namely in half section,

2 the associated closure in a perspective view,

3 is an illustration like FIG. 2, but broken away, 4 detached pull tabs of the closure, one of them in longitudinal section, again in a diagrammatic representation,

5 the associated overcap, isolated and broken open,

6 the matching cap, also broken open,

7 shows the sealing part as a preform,

8 the bottle neck of an infusion or transfusion bottle, each also broken open,

9 shows the preassembled unit of the closure cap in the axial allocation distance, again broken open,

10 shows the bottle neck aligned in accordance with the assignment,

11 closure and bottle in the plug connection, still unsecured,

12 the same in the plug-in assembly, now secured by the overcap moved into its end position,

13 shows a variant of the closure with a central piercing area in the position according to FIG. 12, but with the bottle neck not shown,

14 the closure cap with the associated sealing part, illustrating the configuration of the closure cap-side means of the rotary lock tion, formed from the existing longitudinal slots and the vertical grooves and

15 shows a further variant of the closure in a representation like FIG. 1.

The non-metallic closure V shown consists of a nested double cap with a sealing part 1 held therein.

The sealing part 1 consists of thermoplastic rubber (TPE) and is basically disk-shaped. Its edge 2 is thickened against a bottle neck 3.

A bottle 4 that can be used as an infusion or transfusion bottle consists of glass. The free end of the bottle neck 3 widens radially outward into a bead 5. This provides an undercut flank 6. This serves to undercut through the actual closure cap 7 of the closure V. The overcap covering it (7) bears the reference symbol 8.

The end face 9 widened by the bead 5 is designed in a rotationally symmetrical sloping roof-like manner. The longer flank of the sloping roof slopes outwards. The gable is convexly rounded with a connection to the mouth 10 of the bottle neck 3, a shorter, steeply falling flank.

The underside of the sealing part 1 facing the mouth 10 is recessed flat. The depression bears the reference number 11.

The sealing cap 7 made of tough-hard plastic (PP), like the material-like overcap 8, is cup-shaped. The former hires that Sealing part 1 on the outside surrounding shell part, consisting of a cover cap cover 12 which is essentially planar in the center. It merges into an annular wall 13. Ceiling 12 and ring wall 13 adjoin each other at an angle of over 90 °; in relation to the corner as a vertex, this angle includes approx. 110 °. For the shell-forming attachment of the ring wall 13, this results in a slightly frusto-conical alignment and, with respect to the part on the ceiling, a slightly sloping edge (see FIG. 1). The approach is marked with a and the part with b. They are of the same leg length.

The ring wall 13 continues towards its free, lower end in lower gripping tongues 14. Following the circumferential direction of the closure cap 7, it is a ring of individual tongues which can be rebounded in the manner of a segment of a circle and have excellent restoring force. The curve also has a stabilizing effect. The gripping means is specifically an identically formed locking bead 15 exposed on the bottle neck side. These locking beads 15 are anchored under the undercut flank 6 of the bottle neck 3. The flanks of parts 6 and 15 are matched to one another. They extend approximately at an angle of approx. 40 ° outwards to a horizontal.

The individual gripping tongues 14 freely cutting separation areas are realized as longitudinal slots 16 of the annular wall 13. The slot base 16 of the longitudinal slots 16 is approximately level with the exposed ridge of the end face 9 of the bottle neck 3.

The cap cover 12 leaves puncturable areas. According to one version, the corresponding piercing area 17 lies in the center of the closure V, in the form of a circular hole 18, the radius point of which intersects the longitudinal central axis xx of the closure V, which is basically rotationally symmetrical. The central piercing area is embodied in the version shown from FIG. 9. Otherwise, the structure is identical to the basic version, starting with Fig. 1. The reference numerals are used analogously, sometimes without repeating textiles.

The basic version, as can be clearly seen from FIG. 6, provides two such piercing areas 17 in the cover cap cover 12.

The sealing part 1 projects into the respective hole 18 circumscribing the piercing area 17 with a proportion of rubber-like substance that leads to the cavity.

The hole 18 can, however, also be closed by a correspondingly protruding projection protruding from the bottom or inside of the ceiling 19 of the overcap 8 into the opening or the hole 18. In this case, the sealing part 1 does not have the disk-like filling bodies 20 arranged on its outside.

In terms of production, it is preferred that the sealing part 1 is caught on the sealing cap 7, the sealing part 1 being exposed to the outside of the sealing cap 7 in the circumference of the piercing area 17. Exposed means or includes, leaving a practicable pierceability, so that a cuticle remaining on the top is still to be understood functionally under this term.

Sealing cap 7 and sealing part 1 are produced in a two-component injection molding process. The prefabricated, relatively softer injection molded sealing part 1 is introduced with a shape into the injection / casting mold and overmolded with the relatively harder material that results in the closure cap 7. It comes here to the mentioned catching of the parts 1, 7 to one another, the adhesion of the masses to one another being adjusted such that the sealing part 1 can be released without adhering to the self-supporting hard body, that is to say the closure cap 7.

In such a manufacturing process, the surprising effect of a mechanical cohesion of the parts 1, 7 also occurs, specifically because of the shrinkage of the pot-forming material or part applied to the sealing part 1, so that the closure cap 7 is under elastic prestress against the sealing part 1 stands or vice versa. Thus, the outer edges of the disk-shaped sealing part 1 are edge-clamped by the shell-forming region of the ring wall 13, that is to say the attachment a. The same applies with regard to the easily contracted holes 18, which bind the filler body (s) 20 in a peripheral manner.

The sealing cap 7 thus equipped with the sealing part is combined with the overcap 8 by prepositioning (see FIG. 9).

In this position, the overcap 8 is assigned to the closure cap 7 astride and in a box-appropriate manner. This docking position is defined by a first, reversible locking position with an axial distance y remaining between the inside of the cover 19 of the overcap 8 and the top side of the closure cap cover 12 which has the piercing areas 17. This first, reversible locking position is shown in the drawing I specified.

A unit 1/7/8 assembled in this way is immune to the usual mechanical loads, ie this preassembled unit can be conveyed and sorted, but above all, if necessary, can be fed to the usual sterilization processes. External and internal accessibility is ensured in the largest possible way. ben, because on the one hand the parts 7 and 8 are not yet nested and, moreover, leave the space at a distance y attainable via the openings 21 left in the area of the cap cap 12 under tear-off tabs 22.

The distance y defined by detenting leaves the lower gripping tongues 14 free-standing and fully reboundable. The closure V is placed on the bottle neck 3. Due to the assignment pressure from above, the springing-out lower gripping tongues 14 overlap the bead 5 of the bottle neck 3, which has a larger cross section, until finally the locking beads 15 undercut the undercut surface 6. The latching force holding the parts 7 and 8 at a distance y is set with respect to an insurmountable threshold in such a way that the overcap 8 on the jacket wall of the closure cap 7 only continues to overflow after the described anchoring.

In terms of construction, the procedure for the first, reversible latching position I is such that the closure cap 7 has a latching configuration 23. It is preferably located as a circumferential groove on the outside of the ring wall 13, namely lying close to the cover cap cover 12, more precisely through below a cross-sectional plane of the cover V occupied by the cover 12. The corresponding counter-locking means provides a catch 24 on the inside of a cylinder wall 25 of the cup-shaped overcap 8.

When the parts 7 and 8 are nested (see, for example, FIG. 1), the latch 24 snaps under an inclined locking flank 26 in the back of the latching bead 15. In this position, the cylinder wall 23 surrounds the ring of under-gripping tongues 14 like a tire , which thus securely holds the cap V on the bottle neck 3 of the infusion or transfusion bottle. This irreversible locking mechanism 8, which is secured by the body 8 which practically provides a slide ring Position is marked II. It looks like a flare, only without the means of plastic deformation.

The outside of the ring wall 13 and the inside of the cylinder wall 25 are roughened from the slot base 16 'of the longitudinal slots 16 to the locking lug 24. It is an orderly, form-fit roughening in the form of a horizontally oriented tooth structure. More specifically, this looks in detail in terms of construction in such a way that the closure cap 7 in the circumferential direction of the lower gripping tongues 14 designed in the manner of a segment of a circle has outside latching formations 27 in the form of depressions. In the engage on the inside of the cylinder wall 25 formed locking projections 28 in the form of ribs. The washboard-like contour can be seen in detail in the drawings. The locking projections 28 have a lower radially oriented standing height than the locking lugs 24.

Returning to the tear-off tab or tear-off tabs 22 in the overcap cover 19, it remains to be stated that these are tongue-shaped in outline. The desired separation tear is favored by a line of weakness 29. It is a top-side, notch-valley-like trench guide, with the trench bottom leaving a fraction as a material bridge. In the area of the peripheral openings 21, even this area is broken, so that the marking can be carried out more easily. In this regard, a freely projecting end zone of the tear-off tabs 22 also has a positive effect. The projection does not need to go beyond the general diameter of the overcap 8 if, as shown, the jacket wall of the latter is flattened in this end region. The corresponding sub-groove has the reference symbol 30.

In the basic version two diametrically opposite tear tabs 22 can be seen. The ends round off in the opposite direction before a The area of the top cap cover 19. In this case, a tear-open tab 22 is assigned to a piercing area 17 which is peripherally surrounded by the cover cap cover 12.

In order to achieve a congruent alignment of the piercing area 17 and the tear-open tab 22 during assembly, the overcap 8 is held in a rotationally secured manner on the closure cap 7, which of course does not require such a measure in the case of a centrally located piercing area 17 of the closure V and a diametrically continuous tear-open tab 22.

The rotation lock is achieved by a vertical rib 31 formed on the inside of the cylinder wall 25 of the overcap 8. It projects beyond the height of the locking projections 28 and extends into the cross-sectional area of the ring wall 13 of the closure cap, more precisely into the cross-sectional area of the longitudinal slots 16.

Two axially oriented vertical ribs 31, which are formed diametrically opposite one another, are expediently formed.

As a result of the conical shell-forming part of the ring wall 13, which is therefore not slotted through 16, the longitudinal slot 16 is further drawn in this area occupied by the projection a as a vertical groove 32 which is open to the outside. Since this section, as stated above, tapers in the shape of a truncated cone towards the top of the closure V, this shell wall is retained, albeit in a smaller cross section. The corresponding structural provision that the vertical grooves 32 on the closure cap 7 is formed by the separation area between two adjacent circular segment-like gripping tongues 14 can be seen in the drawing. It is particularly clear from FIG. 14 that the vertical groove 32 extends up to the top of the end cap cover 12 continues, namely leaving a residue 33 of the ring wall 13 of the closure cap 7 indicated there.

A total of eight locking engagement spaces 16/32 distributed at equal angles are taken into account, two of which are occupied diametrically opposite one another by vertical ribs 31.

The spatial assignment of the holes 18 to the locking engagement spaces is such that the desired full coverage of the holes 18 is provided by the tear-off tabs 32 that overlap them.

The correct plug alignment can be practically felt by a slight rotary movement of the overcap 8 towards the closure cap 7. On the other hand, the unused locking intervention rooms 16/32 can also be locked on the input side. In the case of a centrally located hole 19, however, such a precaution is not necessary.

In the event of an injection of the substance forming the sealing part 1 into an already formed closure cap 7, the spreading of the TPE mass can go through the hole or holes 18. 14, however, shows a specification in that the injection is carried out via one of two special holes 34 located near the edge, the other functioning as a ventilation opening. The holes 34 placed in a diametral of the cover cap cover 12 have only a fraction of the clear diameter of the holes 18 forming the filler 20. The ratio is 1: 6. Holes 18 and 34 are circular. They can be cylindrical, frustoconical or undercut. The further variant of the closure V shown in FIG. 15 structurally corresponds predominantly to the basic version described in detail. The reference numerals are used analogously, partly without repeating the text of the variant that is readable in the basic version.

The different embodiment consists in that the essentially disk-shaped sealing element 1 now ends peripherally with a radial distance z from the inside of the ring wall 13 of the closure cap 7. The essentially cylindrical edge 35 of the sealing element 1 stands in contact-free manner in front of the inner side 36 of the ring wall 13 which circumscribes it. The fully circumferential annular gap thus formed bears the reference number 37. In the basic version, however, the annular gap 37 is only rudimentary. It extends only over a fraction of the shell-forming, vertical length of the ring wall 13, to be precise shortly behind the longitudinal slot base 16 '.

On account of the part a of the ring wall 13 which tapers slightly conically towards the cover cap ceiling 12, the said annular gap 37 tapers towards the ceiling-side gap base. This bottom of the gap is provided in part by the other part of the closure cap 7, designated by b. The bottom of the slot is recognizable as a non-contact zone between sealing part 1 and ring wall 13 or ceiling 12.

The annular gap 37 can be used in the sense that it forms a clamping lock between the sealing part 1 and the closure cap 7. The annular gap 37 is dimensioned in the radial direction so that it does not clog after the shrinkage process described. This leaves an access for the attachment of a removal tool, for example in the sense of a desired sorting of the parts forming the closure V. On the other hand, however, there is also a certain radially inward deflection clearance with regard to the latching shape 23 of the closure cap 7.

With regard to the piercing area 17, the means are applied as explained above. If, in a modification of the piercing area described, the hole 18 is not to be occupied by a filler 20 of the sealing part 1, in return, one can proceed in such a way that a corresponding one from the overcap cover 19 or, as shown, from the underside of the tear-off tab 22 Go out the lead that occupies the hole. Such a projection can of course be cylindrical or frustoconical. In the latter case, the hole 18 is then designed to be adapted, ie funnel-shaped. In the back of the protrusion provided by the overcap 8, this can have an indentation from the top.

The correct hole finding is ensured in any case by the described angle-defining means, such as vertical rib 31 and vertical groove 32.

All of the features disclosed are (in themselves) essential to the invention. In the disclosure of the application, the disclosure content of the associated / attached priority documents (copy of the pre-application) is hereby also included in full, also for the purpose of including features of these documents in claims of the present application.

Claims

EXPECTATIONS

1.Capping cap (V) for infusion or transfusion bottles, with a rubber-like sealing part (1) adapted to the bottle neck (3), the sealing cap (7) being formed on the bottle neck (3) to form a bulge (5) underneath grip Furthermore, an overcap (8) is provided for form-fitting retention of the closure cap (7) on the bottle neck (3), characterized in that the sealing part (1) is caught on the closure cap (7), that the sealing part (1) for the exterior of the closure cap (7) is exposed in a piercing area (17) and that the overcap (8) also overlapping the piercing area (17) in a first, reversible latching position (I) with an axial distance (y) to the piercing area (17) on the closure cap ( 7) can be held.

2. A closure cap according to claim 1 or in particular according thereto, characterized in that the closure cap (7) and the sealing part (1) are produced in a two-component injection molding process.

3. Closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that the sealing part (1) is under elastic prestress against the closure cap (7) due to shrinkage.

4. Closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that the closure cap (7) in the circumferential direction formed like a segment of a circle, with a latching bead (15) has under tongues (14), the outside latching formations (27 ) for locking the overcap (8) which has corresponding locking projections (28) on a cylinder wall (25).

5. Closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that the cylinder wall (25) of the overcap (8) for latching engagement of the closure cap (7) at its lower, free end via the latching projections (28) of the cylinder wall (28) protruding latch (24).

6. Closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that the closure cap (7), assigned to a closure cap cover (12), has a latching configuration (23) for reversible latching with the latching lug (24). the overcap (8).

7. Cap according to one or more of the preceding claims or in particular according thereto, characterized in that the latching shape (23) is arranged in a cross section below the cap cover (12).

8. Closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that the overcap (8) has an overcap cover (19) overlapping the piercing area (17).

9. Closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that in the overcap cover (19) by a line of weakness (29) a tear tab (22) extending to the outer edge of the overcap cover (19) ) is formed.

10. Cap according to one or more of the preceding claims or in particular according thereto, characterized in that two diametrically opposed tear tabs (22) are formed, each extending up to a central region of the overcap cover (19).

11. A closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that a tear-open tab (22) is in each case associated with a piercing area (17) which is peripherally surrounded by the cover cap cover (12).

12. Cap according to one or more of the preceding claims or in particular according thereto, characterized in that the overcap (8) on the cap (7) is secured against rotation.

13. A closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that the rotation lock is achieved by vertical ribs (31) formed on the inside on the cylinder wall (25) of the overcap (8), which in corresponding vertical grooves (32) of the closure cap (7) intervene.

14. A closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that a vertical groove (32) on the closure cap (7) is formed through the separation area between two circular segment-like gripping tongues (14).

15. Closure cap according to one or more of the preceding claims or in particular according thereto, characterized in that the vertical groove (32) continues up to the top of the closure cap cover (12), leaving a residual amount (33) of the ring wall (13) of the closure cap ( 7).

16. Cap according to one or more of the preceding claims or in particular according thereto, characterized by a weakly frustoconical transition of the wall of the cap (7) to the cap cover (12).

17. Cap according to one or more of the preceding claims or in particular according thereto, characterized in that the sealing element (1) ends at a radial distance (z) to the inside (36) of the annular wall (13) of the cap (7).