External puncture-free type filtering combined cover and infusion apparatus

Abstract

The utility model discloses an external-puncture-free filter combination cover and an infusion apparatus, the external-puncture-free filter combination cover comprises a shell, a filter element, a filter element, a filter element, a filter element and a filter element, the shell internally comprises an upper area and a lower area which are isolated from each other; the puncture unit is provided with a liquid medicine flow channel communicated to the bottom of the shell, the puncture unit is arranged in the lower area in the shell, and the puncture unit can move upwards to puncture so that the upper area can be communicated with the liquid medicine flow channel of the puncture unit; the sealing unit is detachably sealed at the bottom of the shell, and the sealing unit blocks the liquid medicine flow channel. The infusion container and the infusion tube are blocked or communicated through the filter combined cover structure, a rubber plug does not need to be arranged, puncture falling scraps are avoided, the combined cover structure is simple, the combined cover can be directly used for connecting the infusion container and the infusion tube, the structure of the infusion container and / or the infusion tube does not need to be improved, and the production cost is low.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a non-invasive filter combination cap and infusion set. Background Technology

[0002] Infusion bottles or bags are typically sealed with rubber stoppers. Rubber stoppers are characterized by low dilution rate, good chemical properties, good airtightness, and no physiological toxicity, making them suitable for sealing medications and widely used in sealing large-volume infusion glass bottles and plastic bags. However, before clinical use, the needle of a syringe or infusion set must puncture the rubber stopper to prepare and administer the medication, sometimes requiring multiple punctures during a single administration. When the stopper is punctured, it produces puncture debris. This debris can enter the medication solution and be administered into the body, potentially causing adverse reactions such as pyrogen-like reactions, phlebitis, allergies, and embolism.

[0003] To address this issue, patent document CN103191487A discloses a disposable, needle-based, puncture-free infusion set, comprising a connector B that is sealed to a connector A located on a stopperless bottle cap. Connector A has a medication flow channel A inside, with an easily foldable seal within the channel. Connector B has a groove at its upper end, with a cylindrical protrusion within the groove, and the medication flow channel B is located within the protrusion. This design achieves connection between the large-volume infusion packaging device and the infusion set without puncture, ensuring medication quality and safety. It eliminates the need for a stopper, reducing the manufacturing cost of large-volume infusion glass bottles or plastic infusion bags and lowering resource consumption. The connection structure is robust and provides excellent sealing, preventing medication exposure to air during connection and improving medication safety.

[0004] However, the above-mentioned infusion set not only requires a connector A on the stopperless bottle cap, but also an additional connector B to complete the connection with the infusion tube, which is complex in structure and has high production cost. Utility Model Content

[0005] To address the aforementioned deficiencies in the prior art, the present invention aims to provide a non-invasive filter combination cap and infusion set that eliminates the need for a rubber stopper, thus avoiding the formation of puncture debris. Furthermore, the combination cap has a simple structure and can be directly used to connect infusion containers and infusion tubing, resulting in low production costs.

[0006] The first aspect of this utility model provides a puncture-free filter assembly cover, comprising:

[0007] The outer casing includes an upper region and a lower region that are isolated from each other;

[0008] The puncture unit has a liquid flow channel that connects to the bottom of the outer shell. The puncture unit is located in the lower region inside the outer shell. The puncture unit can move upward to puncture so that the upper region and the liquid flow channel of the puncture unit are connected.

[0009] A sealing unit is detachably sealed to the bottom of the housing, and the sealing unit blocks the liquid flow channel.

[0010] In a preferred embodiment, in the first aspect of this utility model, the outer shell is provided with a detachable inner cover, the bottom wall of the inner cover divides the outer shell into an upper region and a lower region that are isolated from each other, the bottom wall of the inner cover is provided with a puncture area, and the puncture unit can move upward to puncture the puncture area so that the liquid flow channel of the upper region and the puncture unit are connected.

[0011] In a preferred embodiment, in the first aspect of this utility model, the puncture unit includes a support and a puncture member. The support is provided with a liquid flow channel communicating with the bottom of the outer shell. The puncture member is disposed on the support. The support can move upward and drive the puncture member to puncture so that the upper area and the liquid flow channel are connected.

[0012] In a preferred embodiment, in the first aspect of this utility model, the top of the support is provided with a receiving space communicating with the liquid flow channel, and a plurality of support members are provided at intervals in the receiving space. A puncture fixing member is provided on the plurality of support members, and a plurality of through holes communicating with the liquid flow channel are provided on the puncture fixing member. The puncture member is provided on the puncture fixing member.

[0013] In a preferred embodiment, in the first aspect of this utility model, a filter membrane is provided below the puncture fixation member, and the filter membrane is disposed on several support members.

[0014] In a preferred embodiment, in the first aspect of this utility model, the puncture unit is pushed upward by a piston to puncture so that the upper region and the drug flow channel are connected. The piston is located below the puncture unit and has a channel to connect the drug flow channel and the bottom of the outer shell.

[0015] In a preferred embodiment, in the first aspect of the present invention, the sealing unit includes a foldable rod and a sealing plug. The foldable rod is detachably disposed at the bottom of the housing, and the sealing plug is detachably disposed on the foldable rod and extends into the housing to seal the bottom of the housing.

[0016] In a preferred embodiment, in the first aspect of this utility model, the sidewall of the outer shell is provided with an anti-slip structure.

[0017] The second aspect of this utility model provides an infusion set, including: an infusion container, an infusion tube, and the above-mentioned external puncture-free filter combination cap. The upper part of the outer shell is adapted to the opening of the infusion container, and the lower part of the outer shell is adapted to the Luer connector of the infusion tube. The Luer connector is screwed to the lower part of the outer shell and can push the puncture unit to move upward.

[0018] In a preferred embodiment, in the second aspect of this utility model, the Luer connector includes a Luer cone and Luer threads. The Luer threads are disposed on the periphery of the Luer cone. A connecting tube is provided at the lower part of the outer shell. The bottom of the connecting tube is adapted to the Luer cone. The outer wall of the connecting tube is screwed to the Luer threads. A screw-in structure is protruding from the outer wall of the connecting tube.

[0019] The non-invasive filter cap and infusion set provided by this utility model have the following technical advantages:

[0020] The upper part of the outer shell is adapted to the opening of the infusion container, and the lower part of the outer shell is adapted to the Luer connector of the infusion tubing, so that the infusion container and the infusion tubing can be connected through the outer shell. The upper and lower areas inside the outer shell are isolated, with the upper area communicating with the infusion container and the lower area communicating with the infusion tubing, which ensures that the medicine in the infusion container will not flow into the infusion tubing, thus ensuring the sealing of the infusion container.

[0021] The lower part of the outer shell is equipped with a puncture unit, and the bottom of the outer shell is equipped with a detachable sealing unit. When infusion is required, the sealing unit is removed, and the puncture unit is pushed upward through the Luer connector to puncture so that the upper area and the drug flow channel of the puncture unit are connected. This allows the drug in the infusion container to flow into the infusion tube through the upper area and the drug flow channel for infusion therapy.

[0022] This invention achieves the blocking or connection between the infusion container and the infusion tube by setting a filter combination cap structure, eliminating the need for a rubber stopper and avoiding the formation of puncture debris. Moreover, the combination cap structure is simple and can be directly used to connect the infusion container and the infusion tube without modifying the structure of the infusion container and / or the infusion tube, resulting in low production costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the puncture-free filter combination cover of this utility model;

[0024] Figure 2 This is an exploded view of the puncture-free filter assembly cover of this utility model;

[0025] Figure 3 This is a schematic diagram of the puncture unit of this utility model;

[0026] Figure 4 This is an exploded view of the puncture unit of this utility model;

[0027] Figure 5 This is a cross-sectional view of the puncture-free filter assembly cover of this utility model;

[0028] Figure 6 This is a cross-sectional view of the sealing unit of the puncture-free filter assembly cap of this utility model in the disassembled state.

[0029] Figure 7 This is a cross-sectional view of the connection between the external puncture-free filter assembly cap and the Luer connector of this utility model.

[0030] Figure 8 This is an exploded view of the second structure of the puncture-free filter combination cover of this utility model;

[0031] Figure 9 This is a cross-sectional view of the second structure of the puncture-free filter combination cover of this utility model.

[0032] Figure label:

[0033] 1. Outer shell; 11. Upper area; 12. Lower area; 13. Anti-slip structure; 14. Connecting tube; 141. Screw-on structure; 2. Puncture unit; 21. Support; 211. Drug flow channel; 212. Support component; 22. Puncture component; 23. Puncture fixing component; 231. Through hole; 24. Filter membrane; 3. Sealing unit; 31. Flexible rod; 32. Sealing plug; 4. Inner cover; 41. Puncture area; 5. Piston; 51. Channel; 6. Luer cone. Detailed Implementation

[0034] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0037] This utility model provides an infusion set, which includes an infusion container, an infusion tube, and... Figure 1-7The illustrated non-invasive filter combination cap allows for the blocking or connection between the infusion container and the infusion tubing. The infusion container can be a common large-volume glass bottle, infusion bag, etc., with its opening adapted to the upper part of the non-invasive filter combination cap. The infusion tubing also has a common structure, with its Luer connector adapted to the lower part of the non-invasive filter combination cap. The Luer connector is screwed into the lower part of the non-invasive filter combination cap, and this screwing allows the non-invasive filter combination cap to be opened, enabling communication between the infusion container and the infusion tubing through the non-invasive filter combination cap, thus facilitating the delivery of medication.

[0038] See Figure 1 , Figure 3 and Figure 5 The non-invasive filter assembly cap includes a housing 1, a puncture unit 2, and a sealing unit 3. The housing 1 contains an upper region 11 and a lower region 12 that are isolated from each other. The puncture unit 2 has a drug flow channel 211 that connects to the bottom of the housing 1. The puncture unit 2 is located in the lower region 12 within the housing 1. The puncture unit 2 can move upwards to puncture and connect the upper region 11 and the drug flow channel 211 of the puncture unit 2. The sealing unit 3 is detachably sealed to the bottom of the housing 1 and blocks the drug flow channel. The upper part of the housing 1 is adapted to accommodate the opening of an infusion container, and the lower part of the housing 1 is adapted to accommodate a Luer connector for an infusion tube. The Luer connector is screwed into the lower part of the housing 1 and can push the puncture unit 2 upwards.

[0039] The upper region 11 of the outer casing 1 is open at the top, and the lower region 12 of the outer casing 1 is open at the bottom and sealed by the sealing unit 3. The upper part of the outer casing 1 is adapted to the opening of the infusion container, and the lower part of the outer casing 1 is adapted to the Luer connector of the infusion tubing, so that the infusion container and the infusion tubing can be connected through the outer casing 1. The upper region 11 and the lower region 12 inside the outer casing 1 are isolated. The upper region 11 is connected to the infusion container, and the lower region 12 is connected to the infusion tubing, which ensures that the medicine in the infusion container will not flow into the infusion tubing, thus ensuring the sealing of the infusion container.

[0040] The lower inner region 12 of the outer shell 1 is provided with a puncture unit 2, and the bottom of the outer shell 1 is provided with a detachable sealing unit 3. When infusion is required, the sealing unit 3 is removed, and the puncture unit 2 is pushed upward through the Luer connector to puncture so that the upper region 11 and the drug flow channel 211 of the puncture unit 2 are connected, thereby realizing that the drug in the infusion container flows into the infusion tube through the upper region 11 and the drug flow channel 211 for infusion therapy.

[0041] This invention achieves the blocking or connection between the infusion container and the infusion tube by setting a non-puncture-resistant filter combination cap structure. It eliminates the need for rubber stoppers, avoids the formation of puncture debris, and the combination cap structure is simple and can be directly used to connect the infusion container and the infusion tube without modifying the structure of the infusion container and / or the infusion tube, resulting in low production costs.

[0042] The upper part of the outer shell 1 can be welded to the infusion container to ensure the stability and sealing of the connection between the two.

[0043] See Figure 2 and Figure 5 The outer casing 1 has a removable inner cover 4. The bottom wall of the inner cover 4 divides the interior of the outer casing 1 into an isolated upper region 11 and a lower region 12. The bottom wall of the inner cover 4 has a puncture area 41. The puncture unit 2 can move upward to puncture the puncture area 41 to connect the upper region 11 and the drug flow channel 211 of the puncture unit 2. The puncture area 41 of the inner cover 4 can be a weak area to facilitate puncture by the puncture unit 2. The inner cover 4 is detachably installed inside the outer casing 1 and can be replaced after one infusion for the next use without replacing the entire filter assembly cover structure. The side wall of the inner cover 4 is detachably and sealingly connected to the inner wall of the outer casing 1, specifically by snap-fit, so that the drug in the infusion container flows into the drug flow channel 211 through the punctured puncture area 41, preventing leakage.

[0044] See Figure 3-5 The puncture unit 2 includes a support 21 and a puncture element 22. The support 21 has a drug flow channel 211 that connects to the bottom of the outer casing 1. The puncture element 22 is disposed on the support 21. The support 21 can move upward and drive the puncture element 22 to puncture, so that the upper area 11 and the drug flow channel 211 are connected. The puncture element 22 is disposed on the support 21 and avoids the drug flow channel 211. After the puncture element 22 punctures the puncture area 41, the drug in the infusion container flows into the drug flow channel 211 through the puncture port, and then flows into the infusion tube through the Luer connector.

[0045] Furthermore, the top of the support 21 is provided with a receiving space communicating with the drug flow channel 211. Several support members 212 are spaced out and protruded within the receiving space. Each support member 212 is provided with a puncture fixation member 23. The puncture fixation member 23 has several through holes 231 communicating with the drug flow channel 211. The puncture member 22 is located on the puncture fixation member 23. The support members 212 prevent the puncture fixation member 23 from being in close contact with the bottom wall of the receiving space. The through holes 231 on the puncture fixation member 23 facilitate uniform flow of the drug, which then flows into the drug flow channel 211 through the space between the puncture fixation member 23 and the bottom wall of the receiving space. This helps ensure a high flow rate and smooth flow of the drug, thus guaranteeing the infusion effect.

[0046] A filter membrane 24 is located below the puncture fixation element 23, and the filter membrane 24 is mounted on several support elements 212. The filter membrane 24 can be a common microporous filter membrane, which can block the passage of small particles to prevent debris from flowing into the infusion tube with the medication after the puncture element 22 punctures the puncture area 41, thus avoiding adverse reactions caused by infusion. At the same time, medications such as mannitol are prone to crystallization, and the filter membrane 24 can prevent the passage of crystals. The pore size of the filter membrane 24 can be set according to the medication requirements. The puncture fixation element 23, filter membrane 24, and support element 21 are detachably connected and can be replaced at any time as needed.

[0047] Furthermore, the puncture unit 2 is pushed upward by the piston 5 to puncture and connect the upper region 11 and the drug flow channel 211. The piston 5 is located below the puncture unit 2 and has a channel 51 to connect the drug flow channel 211 and the bottom of the outer shell 1. During the screwing of the Luer connector and the connecting tube 14, it can push the piston 5 upward, thereby pushing the puncture unit 2 upward so that the puncture element 22 punctures the puncture area 41, realizing the connection between the drug flow channel 211 and the upper region 11, so that the drug can be delivered to the infusion tube through the channel 51.

[0048] See Figure 2 and Figure 5 The sealing unit 3 includes a flexible rod 31 and a sealing plug 32. The flexible rod 31 is detachably disposed at the bottom of the housing 1, and the sealing plug 32 is detachably disposed on the flexible rod 31 and extends into the housing 1 to seal the bottom of the housing 1. The connection between the flexible rod 31 and the connecting pipe 14 is treated to ensure both sealing effect and easy breakage. The flexible rod 31 can be directly sealed at the bottom of the connecting pipe 14 so that the Luer connector can be screwed to the connecting pipe 14 after the flexible rod 31 is broken.

[0049] Because the connection between the flexible rod 31 and the connecting pipe 14 is weakened, making it difficult to guarantee a tight seal, a sealing plug 32 is placed on the flexible rod 31 to seal the bottom of the connecting pipe 14 and ensure a proper seal. (See reference...) Figure 2 and Figure 5 The sealing plug 32 can be an integral structure with an upper frustum and a lower cylinder, which ensures the sealing performance of the sealing plug 32 and allows the sealing plug 32 to be easily removed when the easy-break rod 31 breaks, thanks to the upper frustum structure. Alternatively, see [link to relevant documentation]. Figure 8 and Figure 9 The maximum outer diameter of the sealing plug 32 is adapted to the inner diameter of the connecting tube 14 and the easy-break rod 31. Based on this, the side wall of the sealing plug 32 is provided with at least one concave structure to form a gap with the inner wall of the connecting tube 14. In this way, the sealing performance of the sealing plug 32 can be guaranteed, and the concave structure can be used to facilitate the sealing plug 32 to be taken out with the easy-break rod 31 when it breaks.

[0050] Based on this, combined Figure 2 and Figure 7 The Luer connector includes a Luer cone 6 and Luer threads. The Luer threads are located on the periphery of the Luer cone 6. A connecting tube 14 is provided at the lower part of the outer shell 1. The bottom of the connecting tube 14 is adapted to fit the Luer cone 6. The outer wall of the connecting tube 14 is screwed into the Luer threads. A screw-in structure 141 protrudes from the outer wall of the connecting tube 14. After the easy-break rod 31 is broken and the sealing plug 32 is taken out, the Luer connector of the infusion tube is connected to the connecting tube 14. The Luer cone 6 is embedded in the connecting tube 14, and the Luer threads are screwed into the connecting tube 14. During the screwing process, the piston 5 is pushed upward by the Luer cone 6, which indirectly pushes the puncture unit 2, so that the puncture piece 22 punctures the puncture area 41. At this time, the Luer connector is locked at the screw-in structure 141.

[0051] See Figure 1 and Figure 2 The screw-on structure 141 can be a protrusion on the connecting tube 14. The inner wall of the Luer thread has a groove that matches the protrusion. When the Luer connector of the infusion tube is connected to the connecting tube 14, the Luer cone 6 is embedded in the connecting tube 14, and the Luer thread is screwed onto the connecting tube 14. During the screwing process, the Luer cone 6 pushes the piston 5 upwards, indirectly pushing the puncture unit 2, causing the puncture piece 22 to puncture the puncture area 41. At this time, the groove and protrusion of the Luer connector are engaged. Alternatively, refer to... Figure 8 and Figure 9 The screw-on structure 141 is an external thread protruding from the connecting tube 14. The inner wall of the Luer thread is provided with an internal thread that matches the external thread. When the Luer connector of the infusion tube is connected to the connecting tube 14, the Luer cone 6 is embedded in the connecting tube 14, and the Luer thread is threaded to the connecting tube 14. During the rotation of the Luer connector, the piston 5 is pushed upward by the Luer cone 6, which indirectly pushes the puncture unit 2, so that the puncture piece 22 punctures the puncture area 41. At this time, the Luer connector and the connecting tube 14 are fixed by the threaded connection.

[0052] It is worth noting that the interior of the Luer cone 6 is hollow to facilitate the passage of the liquid medicine. In practical applications, the shape of the screw connection structure 141 is adapted to the structure of the Luer thread.

[0053] In addition, the side wall of the outer casing 1 is provided with an anti-slip structure 13, which may be an uneven, raised structure to facilitate gripping when connecting the Luer connector to the connecting tube 14. See also Figure 1 and Figure 2 The anti-slip structure 13 can be a series of intermittently spaced protrusions and concaves on the side wall of the outer casing 1. Alternatively, see [link to relevant documentation]. Figure 8 The anti-slip structure 13 can be a concave-convex structure with arbitrary spacing on the side wall of the outer shell 1. The specific structure of the anti-slip structure 13 is not limited, as long as there is a concave-convex structure to achieve anti-slip.

[0054] Based on this, see Figure 5-7 The usage process of the infusion set with the non-invasive filter combination cap of this utility model is as follows:

[0055] When no infusion is being performed, the non-invasive filter combination cap is sealed to the opening of the infusion container, that is, the outer shell 1 is welded to the opening of the infusion container, and the inside of the non-invasive filter combination cap is a sealed structure.

[0056] When intravenous infusion is required, break the easy-break rod 31 and remove the sealing plug 32. Hold the anti-slip structure 13 in one hand and the Luer connector of the infusion tubing in the other. Screw the Luer connector to the connecting tube 14 and lock it in place at the screw-on structure 141. During this process, the Luer cone 6 pushes the piston 5 upward, indirectly pushing the puncture unit 2, causing the puncture element 22 to puncture the puncture area 41. In this way, the medication in the infusion container can flow into the medication flow channel 211 through the puncture opening and through hole 231 in the upper area 11, and then flow into the infusion tubing through the channel 51 and the hollow structure of the Luer cone 6 to achieve intravenous infusion therapy.

[0057] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A filter combination cap for external puncture-free, characterized by, include: An outer casing, the outer casing comprising an upper region and a lower region that are isolated from each other; The puncture unit is provided with a drug flow channel communicating with the bottom of the outer shell. The puncture unit is located in the lower region inside the outer shell. The puncture unit can move upward to puncture so that the upper region and the drug flow channel of the puncture unit are connected. A sealing unit is provided, which is detachably sealed to the bottom of the housing and blocks the liquid flow channel.

2. The no-outer-piercing filter combination cap according to claim 1, wherein: The outer shell is provided with a removable inner cover. The bottom wall of the inner cover divides the outer shell into an upper region and a lower region that are isolated from each other. The bottom wall of the inner cover is provided with a puncture area. The puncture unit can move upward to puncture the puncture area so that the upper region and the drug flow channel of the puncture unit are connected.

3. The no-outer-piercing filter combination cap according to claim 1 or 2, characterized in that: The puncture unit includes a support and a puncture element. The support is provided with a drug flow channel communicating with the bottom of the housing. The puncture element is disposed on the support. The support can move upward and drive the puncture element to puncture so that the upper region and the drug flow channel are connected.

4. The no-outer-piercing filter combination cap according to claim 3, wherein: The top of the support is provided with a receiving space communicating with the drug flow channel. Several support members are provided at intervals in the receiving space. Several support members are provided with puncture fixation members. Several through holes communicating with the drug flow channel are opened in the puncture fixation members. The puncture member is provided on the puncture fixation member.

5. The no-outer-piercing filter combination cap of claim 4, wherein: A filter membrane is provided below the puncture fixation member, and the filter membrane is disposed on several of the support members.

6. The no-outer-piercing filter combination cap according to claim 1 or 2, characterized in that: The puncture unit is pushed upward by a piston to puncture and connect the upper region with the drug flow channel. The piston is located below the puncture unit and has a channel to connect the drug flow channel with the bottom of the outer shell.

7. The no-outer-piercing filter combination cap according to claim 1 or 2, characterized in that: The sealing unit includes a folding rod and a sealing plug. The folding rod is detachably disposed at the bottom of the housing, and the sealing plug is detachably disposed on the folding rod and extends into the housing to seal the bottom of the housing.

8. The no-outer-piercing filter combination cap of claim 1, wherein: The sidewalls of the outer casing are provided with an anti-slip structure.

9. An infusion set, characterized in that include: An infusion container, an infusion tubing, and a non-invasive filter assembly cap as described in any one of claims 1-8, wherein the upper part of the outer shell is adapted to the opening of the infusion container, the lower part of the outer shell is adapted to the Luer connector of the infusion tubing, the Luer connector is screwed to the lower part of the outer shell, and can push the puncture unit to move upward.

10. The infusion set of claim 9, wherein: The Luer connector includes a Luer cone and Luer threads. The Luer threads are located on the periphery of the Luer cone. A connecting tube is provided at the lower part of the outer shell. The bottom of the connecting tube is adapted to the Luer cone. The outer wall of the connecting tube is screwed to the Luer threads. The outer wall of the connecting tube is provided with a screw-in structure.

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