Composite gasket and combined cap for infusion bag

Abstract

The present application discloses a composite gasket and a combined cover for large infusion packaging. The composite gasket comprises an elastic main body in the form of a sheet and a supporting framework supporting the elastic main body. At least one puncture part for inserting a puncture device is arranged at the middle position of the elastic main body. An annular sealing part is formed at the edge of the elastic main body along the circumference of the elastic main body. The supporting framework is arranged inside the elastic main body and located between the puncture part and the sealing part. The present application solves the technical problems of high cost, poor sealing performance and poor supporting performance of the gasket in the combined cover for large infusion packaging.

Description

Technical Field

[0001] This invention relates to the field of large-volume parenteral solution packaging, and more particularly to a composite gasket and a combination cap for large-volume parenteral solution packaging. Background Technology

[0002] Traditional large-volume infusion packaging typically uses a combination cap assembled from a plastic outer cap and a rubber (or elastomer) gasket. These gaskets are relatively large, costly, and require high performance characteristics.

[0003] In recent years, although two-color molding technology has emerged to mold the elastomer and outer cover in one piece, simplifying assembly, this production method is mostly used for lids with easy-tear film opening mechanisms. Its application in other opening mechanisms is less than ideal due to relatively high processing costs and limitations imposed by the elastomer's support performance and cost. Furthermore, both rubber gaskets and elastomer gaskets have their own drawbacks: rubber gaskets involve lengthy production processes, resulting in high energy consumption, difficulties in handling scrap materials, and significant environmental pressure; elastomer gaskets suffer from poor sealing performance, low molding efficiency, and higher prices. These factors hinder the replacement of rubber gaskets with elastomers.

[0004] There is currently no effective solution to the problems of high gasket cost, poor sealing performance, and poor support performance in the combination caps used for large-volume infusion packaging in related technologies.

[0005] Therefore, based on years of experience and practice in related industries, the inventor proposes a composite gasket and a combined cap for large-volume infusion packaging to overcome the shortcomings of the prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a composite gasket and a combined cap for large-volume infusion packaging. While maintaining the original resilience and good holding performance of the gasket for the puncture device, the rigidity of the gasket is increased by setting the skeleton, which greatly improves the support of the gasket and cleverly solves the problem of the inability to balance the rigidity and elasticity of the gasket.

[0007] Another objective of this invention is to provide a composite gasket and a combined cap for large-volume infusion packaging, which retains good elasticity at both the puncture site of the puncture device and the part that fits against the cap, thereby ensuring good holding performance of the puncture device and stable sealing performance between the puncture device and the cap, making it suitable for widespread use.

[0008] The objective of this invention can be achieved using the following technical solutions:

[0009] The present invention provides a composite gasket, the composite gasket comprising a sheet-shaped elastic body and a support skeleton that supports the elastic body, at least one puncture portion for insertion of a puncture instrument is provided at the middle position of the elastic body, and an annular sealing portion is formed along the circumference of the elastic body at the edge of the elastic body, the support skeleton being disposed inside the elastic body and located between the puncture portion and the sealing portion.

[0010] In a preferred embodiment of the present invention, the puncture portion is located at the top center of the elastic body, and a groove or annular protrusion is provided on the puncture portion.

[0011] In a preferred embodiment of the present invention, a retaining ring is provided below the elastic body to enhance the holding ability of the puncture device. The retaining ring is vertically arranged and its top end is connected to the bottom of the elastic body. The hollow part of the retaining ring is vertically opposite to the puncture part.

[0012] In a preferred embodiment of the present invention, a plurality of first clearance grooves are provided at the bottom of the elastic body, and each of the first clearance grooves is arranged circumferentially around the outside of the fixing ring.

[0013] In a preferred embodiment of the present invention, each of the first clearance grooves is an arc-shaped groove, and each of the first clearance grooves is evenly and spaced along the circumference of the fixing ring to form an annular clearance structure around the outer side of the fixing ring.

[0014] In a preferred embodiment of the present invention, the top and bottom of the support frame are both exposed outside the elastic body, the top of the support frame is in the same plane as the top of the elastic body, the bottom of the support frame is in the same plane as the bottom of the elastic body, and the bottom of the support frame is provided with at least one second clearance groove.

[0015] In a preferred embodiment of the present invention, the support frame is provided with a plurality of through holes, and the elastic body is filled into each of the through holes.

[0016] In a preferred embodiment of the present invention, the support frame is made of plastic; the elastic body is made of thermoplastic elastomer, and the support frame and the elastic body are bonded together by a two-color molding method.

[0017] The present invention provides a combined cap for large-volume infusion packaging, the combined cap for large-volume infusion packaging includes a cap body and the aforementioned composite gasket, the composite gasket being disposed inside the cap body.

[0018] In a preferred embodiment of the present invention, the elastic body of the composite gasket is tightly fitted to the inner wall of the cover.

[0019] As described above, the features and advantages of the composite gasket and combined cap for large-volume infusion packaging of the present invention are as follows: a supporting skeleton is added inside the thin-sheet elastic body, which supports the elastic body. While maintaining the original resilience of the gasket through the elastic body, the hardness of the gasket is increased, greatly improving the support of the gasket and achieving a balance between hardness and elasticity. In addition, since a puncture part is provided in the middle of the elastic body, and an annular sealing part is formed along the circumference of the edge of the elastic body, the puncture part allows the insertion of a puncture device and provides a stable clamping force for the puncture device. The sealing part ensures a good seal between the elastic body and the inner wall of the cap, ensuring the normal use of the cap. Attached Figure Description

[0020] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0021] in:

[0022] Figure 1 : This is a top view of the composite gasket of the present invention.

[0023] Figure 2 :for Figure 1 A schematic diagram of the cross-section along the AA direction.

[0024] Figure 3 :for Figure 1 A schematic diagram of the cross-section in the BB direction.

[0025] Figure 4 : This is a bottom view of the composite gasket of the present invention.

[0026] The reference numerals in the accompanying drawings of this invention are:

[0027] 1. Support frame; 101. Second clearance slot;

[0028] 2. Elastic body; 201. Puncture site;

[0029] 202. Fixing ring; 203. First clearance groove;

[0030] 204. Sealing section. Detailed Implementation

[0031] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0032] In this invention, terms such as "top" and "bottom," which indicate direction, are all prefixed with "top." Figure 2 Appendix Figure 3 The directions shown are the reference points, and are explained here.

[0033] Implementation Method 1

[0034] like Figures 1 to 4 As shown, the present invention provides a composite gasket, which includes an elastic body 2 and a support frame 1. The support frame 1 is used to support the elastic body 2. At least one puncture part 201 for inserting a puncture device is provided in the middle position of the elastic body 2, and an annular sealing part 204 is formed along the circumference of the elastic body 2. The support frame 1 is disposed inside the elastic body 2 and located between the puncture part 201 and the sealing part 204, so that the elastic body 2 can retain the original gasket's properties of holding the puncture device, rebounding and sealing, and reducing debris shedding at this position, and the part that mates with the cover can also achieve good contact sealing.

[0035] This invention adds a support frame 1 inside the sheet-like elastic body 2, which significantly reduces the cost of the gasket. Moreover, the support frame 1 can support the elastic body 2. While the elastic body 2 allows the gasket to maintain its original resilience, it also increases the hardness of the gasket, greatly improving its support and achieving a balance between hardness and elasticity. In addition, since a puncture part 201 is provided in the middle of the elastic body 2, and an annular sealing part 204 is formed along the circumference of the edge of the elastic body 2, the puncture part 201 allows the insertion of a puncture tool and provides a stable clamping force for the puncture tool. The sealing part 204 can ensure good sealing between the elastic body 2 and the inner wall of the cover, thereby ensuring the normal use of the cover.

[0036] In this invention, the main functional areas of the composite gasket and the positions requiring sealing with the cover are all configured as elastic bodies 2 to achieve the functions of existing gaskets, while other areas can be replaced by support frames 1. Elastic bodies 2 are configured at the top and edges of the composite gasket where they contact the inner wall of the cover. Supported by the internal support frames 1, these bodies can effectively and tightly contact the corresponding inner wall positions on the outer wall, forming a sealing surface and preventing liquid leakage.

[0037] In an optional embodiment of the present invention, such as Figures 1 to 4 As shown, the elastic body 2 has a circular, thin sheet structure, allowing it to fit the circular cover. Of course, the elastic body 2 can also be designed in different shapes to suit the cover, ensuring a good fit and seal between them. The thickness of the elastic body 2 is adjusted according to the hardness of the material used and the required sealing performance.

[0038] In an optional embodiment of the present invention, such as Figure 1 , Figure 2As shown, the puncture portion 201 is located at the top center of the elastic body 2. A groove or annular protrusion is provided on the puncture portion 201, which serves as a marker for the puncture portion 201. The puncture portion 201 can stably hold and seal the puncture device (or steel needle), and the marking position guides the insertion of the puncture device (or steel needle). The groove or annular protrusion on the puncture portion 201 can be circular, square, or other shapes, and is not limited here.

[0039] In this embodiment, as Figure 1 , Figure 2 , Figure 4 As shown, a retaining ring 202 is located below the elastic body 2. The retaining ring 202 is a cylindrical structure arranged vertically. The top of the retaining ring 202 is connected to the bottom of the elastic body 2, and the hollow part of the retaining ring 202 is vertically opposite to the puncture part 201. During the process of penetrating the puncture part 201, the puncture device (or steel needle) passes through the hollow part of the retaining ring 202 and extends to the bottom of the elastic body 2. The penetration of the puncture device (or steel needle) will cause the retaining ring 202 to deform and contract towards the axis, thereby increasing the holding effect on the puncture device (or steel needle). Because the retaining ring 202 has a cylindrical structure, there is a certain gap between its inner wall and the puncture device (or steel needle), which can prevent excessive compression and large deformation of the material when a thicker puncture device (or steel needle) punctures, thereby improving the rebound sealing performance of the elastic body 2.

[0040] Furthermore, such as Figure 2 , Figure 4 As shown, the bottom of the elastic body 2 is provided with a plurality of first clearance grooves 203, each of which is arranged circumferentially around the outer side of the fixing ring 202. The arrangement of each first clearance groove 203 reduces the compression of the elastic body 2 on its surrounding areas during puncture by the puncture device (or steel needle), ensuring a stable seal between the elastic body 2 and the cap, and also helps to improve the holding effect on the puncture device (or steel needle).

[0041] Specifically, such as Figure 2 , Figure 4 As shown, each of the first clearance grooves 203 is an arc-shaped groove. Each of the first clearance grooves 203 is evenly and spaced along the circumference of the fixing ring 202 to form an annular clearance structure around the outer side of the fixing ring 202, so as to ensure that the puncture device (or steel needle) is subjected to uniform force in the circumference.

[0042] In an optional embodiment of the present invention, such as Figures 1 to 4As shown, the top and bottom of the support frame 1 are exposed outside the elastic body 2. The top of the support frame 1 is in the same plane as the top of the elastic body 2, and the bottom of the support frame 1 is in the same plane as the bottom of the elastic body 2. The exposed portions are designed to ensure that no puncture device (or steel needle) can penetrate them, the seal between the gasket and the cover is not compromised, and the functional area of ​​the gasket is not affected. The goal is to maximize the support for the elastic body 2.

[0043] Furthermore, such as Figure 3 , Figure 4 As shown, the bottom of the support frame 1 is provided with at least one second clearance groove 101, which increases the strength of the support frame 1 while reducing weight and shrinkage after contact with liquid.

[0044] In this embodiment, the support frame 1 can have various structures, which are adjusted according to the structure of the composite gasket and the requirements of the molding technology. Specifically, the support frame 1 can be a flat plate structure connected to the elastic body 2, or it can have multiple through holes opened on the support frame 1, with the elastic body 2 filling into each through hole. This structure helps to improve the stability of the connection between the support frame 1 and the elastic body 2 and enhance the strength of the connection between the two.

[0045] In this embodiment, the supporting frame 1 and the elastic body 2 are bonded together using a two-color molding method. The two-color molding method is an existing molding technology, also known as co-injection technology. It refers to a molding method that uses an injection molding machine with two injection units to simultaneously or sequentially inject plastics of different colors or types into the same mold. Using this method to produce composite gaskets achieves optimal production efficiency and cost reduction, making it suitable for widespread use.

[0046] Furthermore, the support frame 1 can be made of, but is not limited to, plastic; the elastic body 2 can be made of, but is not limited to, thermoplastic elastomer. Thermoplastic elastomers possess the processing characteristics of plastics, melting when heated and solidifying upon cooling, and possess corresponding physical and mechanical properties. Therefore, thermoplastic elastomers are suitable for bonding with the plastic support frame 1 to form a single unit. The specific process is as follows: the plastic support frame 1 is first formed using a two-color molding process; then, the heated and melted thermoplastic elastomer is injected into the mold to encapsulate the support frame 1. After cooling and solidification, the composite gasket of this invention is completed.

[0047] The features and advantages of the composite gasket of the present invention are as follows:

[0048] 1. The composite gasket has a support frame 1 set inside the elastic body 2. The support frame 1 supports the elastic body 2, which can significantly reduce the cost of the gasket. On the other hand, the support capacity of the support frame 1 solves the problem of the conflict between hardness and elasticity in existing gaskets. It is not necessary to increase the overall hardness of the gasket in order to improve the clamping performance of the gasket on the puncture device (or steel needle), thereby damaging its rebound performance.

[0049] Second, in this composite gasket, the elastic body 2 is located in the functional area of ​​the gasket and the position where it needs to be sealed with the cover. The functional area of ​​the gasket can continue to retain good clamping performance, rebound sealing performance and optimal chip removal performance for the puncture device (or steel needle). Moreover, the position where the gasket needs to be sealed with the cover can be tightly fitted with the inner wall of the cover through the elastic body 2, ensuring good sealing performance of the cover.

[0050] Third, the composite gasket uses a two-color molding technology to bond the elastic body 2 and the supporting frame 1 into an integrated structure, which is highly efficient in production and has a stable structure.

[0051] Fourth, the composite gasket can be designed to be the same size as the existing rubber gasket and retain the function of the existing rubber material. Therefore, the composite gasket of the present invention can directly replace the existing rubber (or elastomer) gasket, thereby avoiding changes and investments in molds and equipment during the production of the composite cover, and will not affect other production equipment. Existing production equipment can be used directly and assembled with existing composite covers.

[0052] V. In this composite gasket, the elastic body 2 is made of thermoplastic elastomer. Compared with existing rubber materials, thermoplastic elastomer is a thermoplastic reprocessable material, which is simple to process and consumes less energy. It is more environmentally friendly and energy-saving than rubber materials.

[0053] Implementation Method 2

[0054] The present invention provides a combined cap for large-volume infusion packaging. The combined cap for large-volume infusion packaging includes a cap body and the aforementioned composite gasket. The composite gasket is disposed inside the cap body, and the elastic body 2 of the composite gasket is tightly fitted with the inner wall of the cap body to achieve a good sealing effect between the composite gasket and the cap body.

[0055] The production process of the combined cap for large-volume parenteral solution packaging in this invention is as follows: the composite gasket mentioned above is directly injection molded using a two-color injection molding machine, and then the composite gasket and the cap body (including the outer cap and the inner cap) are assembled together using an assembly machine to complete the assembly of the combined cap for large-volume parenteral solution packaging.

[0056] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A composite gasket, characterized in that, The composite gasket includes a sheet-shaped elastic body and a support frame that supports the elastic body. At least one puncture portion for inserting a puncture instrument is provided in the middle of the elastic body, and an annular sealing portion is formed along the circumference of the elastic body at the edge of the elastic body. The support frame is disposed inside the elastic body and located between the puncture portion and the sealing portion. The support frame has multiple through holes, the elastic body is filled into each of the through holes, and the support frame and the elastic body are bonded together by a two-color molding method; A retaining ring is provided below the elastic body to enhance the holding ability of the puncture device. The retaining ring is vertically arranged and its top end is connected to the bottom of the elastic body. The hollow part of the retaining ring is vertically opposite to the puncture part. The passage of the puncture device will cause the retaining ring to deform and contract towards the axis, thereby increasing the holding effect on the puncture device. A certain gap is left between the inner wall of the retaining ring and the puncture device. The bottom of the elastic body is provided with a plurality of first clearance grooves, each of which is an arc-shaped groove. The first clearance grooves are evenly and spaced along the circumference of the fixed ring to form an annular clearance structure around the outer side of the fixed ring.

2. The composite gasket as described in claim 1, characterized in that, The puncture portion is located at the top center of the elastic body, and a groove or annular protrusion is provided on the puncture portion.

3. The composite gasket as described in claim 1, characterized in that, The top and bottom of the support frame are both exposed outside the elastic body. The top of the support frame is in the same plane as the top of the elastic body, and the bottom of the support frame is in the same plane as the bottom of the elastic body. The bottom of the support frame is provided with at least one second clearance groove.

4. The composite gasket as described in claim 1 or 3, characterized in that, The supporting frame is made of plastic; the elastic body is made of thermoplastic elastomer.

5. A combination cap for large-volume parenteral solution packaging, characterized in that, The combined cap for large-volume infusion packaging includes a cap body and a composite gasket as described in any one of claims 1 to 4, wherein the composite gasket is disposed inside the cap body.

6. The combination cap for large-volume parenteral solution packaging as described in claim 5, characterized in that, The elastic body of the composite gasket fits tightly against the inner wall of the cover.

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