Container System

Abstract

A container system for liquids includes a container body with a mouth, a resilient stopper and a cap. The stopper has a body portion closely received within the mouth, and an annular flange projecting radially outward from the body. A resilient annular spring element is located between the flange of the stopper and the cap, and biases the flange against the mouth of the container when the container is assembled and maintains a seal between the flange and cap. In one embodiment, the spring element has a unitary, tear-drop shaped geometry in cross-section with a rounded bulbous body portion smoothly tapering to a curved, radially-inwardly projecting lip, although the spring element could have other asymmetrical configurations such as a cone, helical, V, S or C shape in cross-section. The spring element defines at least two separate points of contact between the flange of the stopper and cap.

Claims

1. A container system for liquids, the container system comprising: a. a container body with a mouth circumscribing a central axis; b. a resilient stopper having a body portion closely received within the mouth of the container and a distal end projecting outwardly from the mouth, the distal end having an annular flange projecting radially outward from the distal end and having an axially-inwardly facing surface and axially-outwardly facing surface, with the axially inwardly facing surface in sealed engaging relationship against a distal outer end of the mouth; c. a cap secured over the mouth of the container body and enclosing the distal outer end of the stopper, the cap including an axially-inwardly facing surface, wherein a channel is defined between the axially-inwardly facing surface of the cap and the axially-outward facing surface of the flange of the stopper; d. a spring element located in the channel, the spring element comprised of a resilient polymer and having a shaped geometry in cross-section defining at least two separate points of contact between the stopper and cap within the channel; and e. optionally, one or more tubes extending through the stopper in fluid-tight relationship therewith to enable fluid to be introduced and/or removed from the container body, wherein the spring element provides axial compression against the flange of the stopper to maintain the flange in sealing relationship with the distal end of the mouth of the container and maintains a seal between the stopper and cap.

2. The container system as in claim 1, wherein the spring element has at least two separate points of contact between the cap and the flange of the stopper.

3. The container system as in claim 2, wherein the spring element has three separate points of contact between the cap and the flange.

4. The container system as in claim 1, wherein the spring element has a rounded bulbous body portion tapering to a curved, radially-inwardly projecting lip.

5. The container system as in claim 4, wherein the spring element is located between the cap and stopper with the bulbous portion having a surface sealingly engaged with the axially outwardly-facing surface of the flange, and the lip is sealingly engaged with the axially inwardly-facing surface of the cap.

6. The container system as in claim 5, wherein the bulbous portion has opposite surfaces sealingly engaged with and between the axially outwardly-facing surface of the flange and the axially inwardly-facing surface of the cap.

7. The container system as in claim 1, wherein the spring element has an asymmetric shape in cross-section sealing against the flange of the stopper and the cap.

8. The container system as in claim 7, wherein the spring element has a cone, helical, V, S or C shaped configuration in cross-section.

9. The container system as in claim 1, wherein the spring element has an annular, unitary configuration.

10. The container system as in claim 1, wherein the spring element is polyketone.

11. The container system as in claim 1, wherein the stopper is silicone.

12. The container system as in claim 1, wherein the distal end of the stopper has a radially-outward facing surface, which together with the axially-outwardly facing surface of the flange, defines an outwardly-facing shoulder, and the cap has a radially-inwardly facing surface which together with the axially-inwardly facing surface of the cap, defines an inwardly-facing shoulder in opposed relation to the outwardly facing shoulder of the stopper and defining the channel.

13. The container system as in claim 1, wherein the body portion of the stopper includes one or more ribs circumscribing an outer surface of the stopper.

14. The container system as in claim 1, wherein the cap has a cup-shaped body with a central opening.

15. The container system as in claim 1, wherein the cap and container body each include a threaded connection.

16. A method for assembling a container assembly comprising i) a container body with a mouth circumscribing a central axis; ii) a resilient stopper having a body portion and a distal end, an annular flange projecting radially outward from the distal end of the stopper and having an axially-inwardly facing surface and axially-outwardly facing surface; iii) a cap including an axially-inwardly facing surface; and a spring element comprised of a resilient polymer, the method comprising the steps of: a. inserting the stopper into the mouth of the container body such that the distal end of the stopper extends outwardly from the container body and the flange of the stopper is located in engagement with a distal end of the mouth of the container; b. locating the spring element in the cap against the axially-inwardly facing surface; c. securing the cap over the mouth of the container body so as to enclose the distal outer end of the stopper and compressing the spring element between the cap and the flange of the stopper, the spring element being located in a channel defined between the axially-inward facing surface of the cap and the axially-outward facing surface of the stopper and the spring element having at least two separate points of contact between the axially-inwardly facing surface of the cap and the axially-outward facing surface of the flange and urging the flange into sealing relation against the distal end of the mouth of the container and maintaining a seal.

17. The method as in claim 16, wherein the spring element has three separate points of contact between the axially-inwardly facing surface of the cap and the axially-outward facing surface of the flange.

18. A container system for liquids, the container system comprising: a. a container body with a mouth circumscribing a central axis; b. a resilient stopper having a body portion closely received within the mouth of the container, a distal end projecting outwardly from the mouth, and an annular flange projecting radially outward from the distal end, the distal end of the stopper having a radially-outwardly facing surface, and the flange having an axially-inwardly facing surface and axially-outwardly facing surface, with the axially-inwardly facing surface in sealed engaging relationship against a distal outer end of the mouth and the axially-outwardly facing surface together with the radially-outwardly facing surface of the distal end defining an outwardly-facing shoulder; c. a cup-shaped cap threadably secured over the mouth of the container body and enclosing the distal outer end of the stopper, the cap including a radially-inwardly facing surface and an axially-inwardly facing surface, which together define an inwardly-facing shoulder in opposed relation to the outwardly facing shoulder of the stopper and defining a channel; d. an annular spring element located in the channel, the spring element comprised of a resilient polymer and having a shaped geometry in cross-section defining at least two separate points of contact between the flange of the stopper and the cap within the channel; and e. optionally, one or more tubes extending through the stopper in fluid-tight relationship therewith to enable fluid to be introduced and/or removed from the container body, wherein the spring element provides axial compression against the flange of the stopper to maintain the flange in sealing relationship with the distal end of the mouth of the container, and provides a seal between the flange and the cap.

19. The container system as in claim 18, wherein the spring element has a rounded bulbous body portion tapering to a curved, radially-inwardly projecting lip.

20. The container system as in claim 19, wherein the spring element is located between the cap and stopper with the bulbous portion having a surface sealingly engaged with the axially outwardly-facing surface of the flange, and the lip is sealingly engaged with the axially inwardly-facing surface of the cap.

21. The container system as in claim 20, wherein the bulbous portion has opposite surfaces sealingly engaged with and between the axially outwardly-facing surface of the flange and the axially inwardly-facing surface of the cap.

22. The container system as in claim 18, wherein the spring element has an asymmetric shape in cross-section sealing against the flange of the stopper and the cap.

23. The container system as in claim 22, wherein the spring element has a cone, helical, V, S or C shaped configuration in cross-section.

24. The container system as in claim 18, wherein the spring element is polyketone.

25. The container system as in claim 18, wherein the stopper is silicone.

26. The container system as in claim 18, wherein the body portion of the stopper includes an outer surface with one or more ribs surrounding and unitary with an outer surface of the stopper.

27. A closure assembly for a container having a mouth, the closure assembly comprising: a. a resilient stopper having a body portion with a configuration adapted to be closely received within the mouth of the container and with a distal end extending outwardly from the mouth, the distal end having an annular flange projecting radially outward from the distal end and having an axially-inwardly facing surface and axially-outwardly facing surface; b. a cap configured to be secured over the mouth of the container body enclosing the distal outer end of the stopper, the cap including an axially-inward facing surface which together with the axially-outward facing surface of the stopper, define a channel when the stopper, cap and container are assembled with the stopper located in the mouth of the container body and the cap secured over the mouth; c. a spring element located in the cap against the axially-inwardly facing surface and located so as to be situated in the channel when the stopper, cap and container are assembled, the spring element comprised of a resilient polymer and having a shaped geometry in cross-section, the spring element having at least one point of contact with the axially-inwardly facing surface of the cap, and also a point of contact with the flange of the stopper so as to provide axial compression against the flange of the stopper to maintain the flange in sealing relationship with the distal end of the mouth of the container and a seal between the stopper and cap when the stopper, cap and container are assembled; and d. optionally, one or more tubes extending through the stopper in fluid-tight relationship therewith to enable fluid to be introduced and/or removed from the container body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is an elevated perspective view of a container system constructed according to the principles of the present invention;

[0017] FIG. 2 is a cross-sectional side view of the upper portion of the container system of FIG. 1 with tubing removed;

[0018] FIG. 3 is a cross-sectional schematic side view of a portion of the container system of FIG. 1, where the spring element is shown in a first embodiment with one energized configuration;

[0019] FIG. 4 is a cross-sectional side view of a portion of the container system of FIG. 1, where the spring element is shown in another energized configuration;

[0020] FIG. 5 is a cross-sectional side view of a portion of the container system, showing a second embodiment of the spring element;

[0021] FIG. 6 a cross-sectional side view of a portion of the container system, showing a third embodiment of the spring element;

[0022] FIG. 7 is a cross-sectional side view of a portion of the container system, showing a fourth embodiment of the spring element;

[0023] FIG. 8 is a cross-sectional side view of a portion of the container system, showing a fifth embodiment of the spring element; and

[0024] FIG. 9 is a cross-sectional side view of a portion of the container system, showing a sixth embodiment of the spring element.

DETAILED DESCRIPTION

[0025] Referring now to FIGS. 1 and 2, a container system is illustrated generally at 10, having a container body 14 with an elongated neck 15 with an annular mouth, indicated generally at 18, circumscribing a central axis, a resilient stopper 20 and a cap 24 with a central opening 26. The stopper has a circular body portion 30 closely received within the mouth and extending down into the neck, and can have one or more radially-projecting ribs 32 circumscribing the outer surface of the stopper which compress in a sealing manner against the inner surface of the neck. The stopper has a distal end 33 which extends a short distance outwardly from the mouth and includes a radial flange 34 circumscribing the stopper.

[0026] As shown also in FIG. 3, the flange 34 has an axially-outward facing annular flat surface 40 and an axially-inwardly facing annular flat surface 41. Flange 34 is located between the distal end 42 of the mouth and the cap 18 when the container system is assembled, with the axially-inwardly facing surface 41 in engagement with the distal end 42 of the mouth. The distal end 33 of the stopper has a radially-outward facing annular surface 44, which together with the axially-outwardly facing surface 40 of the flange, defines an outwardly-facing shoulder.

[0027] The cap 24 has a cup-shaped configuration with an annular end wall 50 circumscribing a central opening 52, and an annular side wall 54. Side wall 54 includes internal threads or flights 55 which cooperate with external threads or flights 56 on the neck 15 of the container to secure the cap onto the container. The end wall has an annular flat, axially-inwardly facing surface 57, which together with a radially-inwardly facing surface 60 of the side wall 54, defines an inwardly-facing shoulder in opposed relation to the outwardly facing shoulder of the stopper, with the axially-inwardly facing surface 57 of the cap in opposed relation to the axially-outwardly facing surface 40 of the flange of the stopper. An annular channel, indicated generally at 62, is defined between the surfaces of the stopper and cap.

[0028] An annular spring element 70 is located in the channel 62 between the cap and stopper, and according to a first embodiment, has a unitary, tear-drop shaped geometry in cross-section with a radially-outer, rounded bulbous body portion 72 smoothly tapering along a neck portion 74 to a curved, radially-inwardly projecting lip 76.

[0029] The spring element is preferably comprised of a resilient, high-performance thermoplastic polymer, such as polyketone or similar material such as polyether ether ketone, polyphenylsulfone or polycarbonate, which is capable of maintaining its pliancy and shape over a wide temperature range. An appropriate polyketone is available from Parker Hannifin GmbH, Bietigheim-Bissingen Germany, under the tradename Nobrox. Again, other high-performance, chemically-resistant and biologically compatible material that maintains its pliancy and compression across wide temperature ranges may be appropriate depending on the particular application. The spring element is preferably formed (molded) in one unitary piece from a single material, but could be formed in multiple connected pieces of the same or different material as should be appreciated by those skilled in the art.

[0030] The spring element 70 is located in the channel such that the element has at least an axially inner surface or edge 78 of the bulbous body portion 72 sealingly engaged with the axially-outward facing surface 40 of the flange, and an outer surface or edge 80 of the lip 76 sealingly engaged with the axially inwardly-facing surface 57 of the cap. As shown in FIG. 3, the spring element has a configuration that defines two points of contact between the cap and the stopper; although as shown in FIG. 4, the element 70 could be configured to have three points of contact with opposite sides or edges 78a, 78b of the bulbous portion 72 sealingly engaging the axially inwardly-facing surface 57 of the cap 50 and the axially-outwardly facing surface 40 of the flange of the stopper, and the lip 76 separately sealingly engaging the axially inwardly-facing surface 57 of the cap.

[0031] The stopper, cap, tubing and container can be formed of materials which are non-reactive to the liquids being stored and transported, and can withstand many of the typical operating conditions so that the contents of the container remain sterile and do not leak. Typical materials for the stopper include resilient plastics and elastomers such as polyether ketones, thermoplastic or silicone. Typical materials for the tubing include polycarbonate (e.g., silicone) or equivalent, while typical materials for the container include glass, plastic or other polymer such as polyethylene (e.g., Nalgene), in a rigid (e.g., bottle-shaped) or flexible (e.g., a bag) form. The cap can be formed of a polymer such as plastic, elastomer, or other appropriate material. The stopper, cap, tubing and container can be formed using conventional techniques, such as molding and extruding.

[0032] When the container system is assembled, the stopper 20 is inserted into the mouth of the container with the flange 34 located against the distal end 42 of the mouth. The distal end 33 of the stopper extends outwardly a short distance from the container body. The spring element 70 can be located in the cap against the axially-inwardly facing surface 57, and when the cap is screwed down onto the mouth of the container, the cap captures the flange 34 between the inner axial surface 57 of the cap and the distal end 42 of the mouth. Locating the spring element within the cap enables the cap and spring element to be preassembled as a closure assembly, and sterilized for use. Alternatively, the spring element can be initially located around distal end of the stopper, against the flange. In any event, when the cap is screwed onto the mouth of the container, the cap compresses the spring element 70 within the channel between the cap and the flange, which causes the spring element to compressively urge the stopper 20 inwardly against the mouth of the container, and hence urge the flange 34 against the distal end of the mouth. The compressive resiliency of the spring element maintains the seal between the flange of the stopper and the mouth of the container and also maintains a seal between the flange and the inside surface of the cap, even during low temperatures and cycling over a wide temperature range.

[0033] As indicated above, the cap 24 includes a central opening 26 in its end, which enables flexible tubing to be inserted into through-holes in the stopper to enable liquid to be introduced and withdrawn from the container. While shown as separate pieces, the tubes could likewise be formed in one piece with (unitarily) with the stopper.

[0034] During use, the liquid is introduced through a feed tube 90 (FIG. 1) under aseptic conditions into a cleaned and sterilized container, with a vent tube 92 enabling air within the container to escape. The tubes are then closed, a protective over cap (not shown) is applied to the cap, and the container can be irradiated (if appropriate) and frozen for storage and transport. When it is desired to remove the contents of the container, the container is thawed, the tubes are re-opened, and the liquid is recovered.

[0035] Although not separately described, the container, cap, stopper and tubing can be sterilized, irradiated and otherwise cleaned before and during use to create an aseptic environment, as should be known to those skilled in the art. The stopper, tubing, container and cap can also be cleaned and reused if appropriate, but are typically disposed after a single use.

[0036] According to other embodiments, the seal can have other asymmetrical shapes besides tear-drop shaped which provide a bias against the flange of the stopper, and hence maintain the flange in sealing relation against the distal end of the mouth of the container and a seal between the flange and the inside surface of the cap at low temperatures and when the container is cycled from low temperature to ambient.

[0037] For example, FIG. 5 shows a second embodiment of the spring element 70 which has a V shape in cross-section. In such embodiment, the spring element has a pair of outwardly projecting legs 73, with the distal ends engaging the cap 24, and the intersection of the legs engaging the flange 34 of the stopper 20. As with the first embodiment above, the spring element is located and compressed between the axially-inwardly facing surface 57 of the outer wall 50 of the cap 24, and the axially-outwardly facing surface 40 of the flange 34 of the stopper 20, when the cap is screwed onto the container. The spring element is shown having three points of contacttwo at the distal ends of the legs of the V against the cap; and one at the intersection of the legs of the V against the flange 24. When the cap 24 is screwed down on the container 14, the cap urges the spring element into compressed engagement with the flange of the stopper, which maintains the flange in sealing relation with the distal end of the mouth of the container as well as maintains a seal between the flange and the cap.

[0038] FIG. 6 shows a third embodiment of the spring element 70 having a conical configuration. This spring element is likewise positioned between the cap 24 and flange 34 of the stopper 20, but only has two opposite points of contact.

[0039] FIG. 7 shows a fourth embodiment of the spring element 70 having a helical configuration, with a single flight of the spring circumscribing the distal end of the stopper. This spring element is likewise positioned between the cap 24 and flange 34 of the stopper 20, with two points of contact.

[0040] FIG. 8 shows a fifth embodiment of the spring element 70 with a C-shaped configuration, with the legs 74 of the spring element respectively engaging along two opposite side surfaces of the legs the axially-inwardly facing surface 57 of the cap 24 and the axially-outwardly facing surface 40 of the flange 34 of the stopper 20.

[0041] FIG. 9 shows a sixth embodiment of the spring element 70 having an S-shaped configuration also with two points of contact along the side surfaces 76 of the distal ends of the spring element against the axially-inwardly facing surface 57 of the cap 24 and the axially-outwardly facing surface 40 of the flange 34 of the stopper 20.

[0042] Again, spring elements having other asymmetrical configurations are possible as should be appreciated by those skilled in the art, where the spring element has a configuration that urges the flange of the stopper against the distal end of the mouth of the container and maintains a seal also between the flange and the cap even during low temperatures and cycling between low temperatures and ambient.

[0043] Thus, as described above, a container system for liquids is provided which has an improved seal between the stopper and container which prevents leakage during low temperature storage and transport, and later use at ambient temperatures. The container system remains simple to manufacture and assemble, and relatively inexpensive to construct, as the stopper can continue to be made of low-cost, non-reactive resilient material, such as silicone or a similar material; while the spring element can be separately formed in different configurations and out of more expensive, high-performance materials, but overall, the system is capable of meeting the operational requirements of many biological and pharmaceutical applications.

[0044] The principles, preferred embodiments and modes of operation of the present invention have been described in the foregoing specification. The invention which is intended to be protected herein should not, however, be construed as limited to the particular form described as it is to be regarded as illustrative rather than restrictive. Variations and changes may be made by those skilled in the art without departing from the scope and spirit of the invention as set forth in the appended claims.