A fitting locking device for a luer lock cap

Abstract

The utility model discloses a kind of joint locking devices of luer lock protective cap, belong to medical field, including pre-filled syringe, the screw joint of being clamped on the injection port of pre-filled syringe and the luer lock protective cap corresponding with screw joint, the luer lock protective cap includes the shell stud of being connected with screw joint thread and the rubber plug passing through the center of shell stud.The utility model is compared with prior art's advantage is in at:the device is through the multiple annular sealing rings on the inside wall of syringe fixing sleeve cavity, the injection port of pre-filled syringe is carried out multilayer closed connection, the sealing influence of syringe fixing sleeve cavity size deviation to pre-filled syringe can be effectively weakened, even if the annular sealing ring size deviation is relatively large, the effect of sealing can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the medical field, specifically to a joint locking device for a Luer lock cap. Background Technology

[0002] Luer lock caps are plastic products used for pre-filled syringes. They are mainly used to connect the syringe needle and the drug container to ensure the safety and effectiveness of the drug. To ensure the stability of the connection, the Luer lock cap has a corresponding connector locking structure inside.

[0003] The existing Luer lock cap connector locking device mainly consists of a spiral connector that is locked above the pre-filled syringe and a Luer lock cap. The structure of the Luer lock cap consists of a housing stud screwed inside the threaded sleeve of the spiral connector, a rubber stopper passing through the housing stud, and a syringe retaining sleeve. There is a snap-fit ​​groove between the bottom surfaces of the rubber stopper and the syringe retaining sleeve for fixing the position of the rubber stopper, and the inside of the housing stud has a hollow retaining plate corresponding to the snap-fit ​​groove. The snap-fit ​​structure of the two is used to fix the position of the rubber stopper and the syringe retaining sleeve in the housing stud, thereby ensuring that the injection port of the pre-filled syringe can be sealed in the syringe retaining sleeve.

[0004] To reduce the impact of external bacteria on the medication inside the pre-filled syringe nozzle, the syringe retainer is usually made of rubber and fits tightly against the outer wall of the pre-filled syringe nozzle. However, the seal between the two depends entirely on the tightness of the syringe retainer. If there is a large deviation in the shape of the syringe retainer cavity, the seal will not be tight, thus affecting the quality of the medication inside the pre-filled syringe. Furthermore, since the shell stud is usually a through hole, and the rubber stopper and syringe retainer are tightly fixed by a snap-fit ​​structure, usually reinforced with glue, the syringe retainer is prone to loosening under strong external force. Summary of the Invention

[0005] The technical problem this invention aims to solve is that when the syringe fixing sleeve of the existing Luer lock cap connector locking device has a large deviation, the medicine is prone to deterioration, and the syringe fixing sleeve is prone to slipping out of the central hole of the housing stud due to external interference.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a connector locking device for a Luer lock cap, comprising a pre-filled syringe, a spiral connector that is locked on the injection port of the pre-filled syringe, and a Luer lock cap corresponding to the spiral connector. The Luer lock cap includes a housing stud that is threadedly connected to the spiral connector and a rubber plug that passes through the center of the housing stud. Below the rubber plug is a syringe fixing sleeve that is connected to the cavity of the housing stud through a snap-fit ​​structure. Inside the syringe fixing sleeve are a plurality of annular sealing rings that fit on the injection port of the pre-filled syringe. The top surface of the housing stud is provided with a threaded plate that is threadedly connected to the cavity of the housing stud, and a silicone sealing gasket is provided between the rubber plug and the threaded plate.

[0007] As an improvement, the outer wall end of the threaded plate is provided with a slot for easy disassembly.

[0008] As an improvement, the bottom surface of the syringe retaining sleeve is provided with a sealing protrusion to seal the inner wall of the pre-filled syringe injection port.

[0009] As an improvement, the outer wall of the spiral connector and the outer wall end of the housing stud are provided with anti-slip grooves to prevent hand slippage.

[0010] As an improvement, both the rubber stopper and the syringe retainer are made of butyl rubber, and the rubber stopper and the syringe retainer are an integrated structure.

[0011] As an improvement, the pre-filled syringe is made of glass.

[0012] The advantages of this utility model compared with the prior art are as follows: 1. This device uses multiple annular sealing rings on the inner side wall of the syringe fixing sleeve cavity to form a multi-layer sealing connection for the injection port of the pre-filled syringe. This can effectively reduce the impact of dimensional deviations of the syringe fixing sleeve cavity on the sealing of the pre-filled syringe. Even if there are a few annular sealing rings with large dimensional deviations, the sealing effect can still be guaranteed.

[0013] 2. To reduce the dependence of the rubber stopper and syringe retainer on the snap-fit ​​structure, this device installs a threaded plate on the top surface of the rubber stopper, which is threaded to the inside of the stud cavity of the housing. The threaded plate supports the top surface of the rubber stopper, which can effectively prevent the snap-fit ​​connection from loosening when the rubber stopper is subjected to external force. In order to prevent water from entering the stud cavity of the housing, silicone sealing gaskets are installed on the threaded plate and the top surface of the rubber stopper to ensure its sealing performance. Attached Figure Description

[0014] Figure 1 This is a general structural diagram of the joint locking device for a Luer lock cap according to this utility model.

[0015] Figure 2This is a cross-sectional view of the overall structure of the joint locking device for a Luer lock cap according to this utility model.

[0016] Figure 3 This is an exploded view of the Luer lock cap connection of the Luer lock cap of this utility model.

[0017] Figure 4 This is a partial cross-sectional view of the rubber plug connection of the connector locking device of the Luer lock cap according to this utility model.

[0018] Figure 5 This is a partial sectional view of the housing stud of the joint locking device for a Luer lock cap according to this utility model.

[0019] As shown in the figure: 1. Pre-filled syringe; 2. Screw connector; 3. Luer lock cap; 31. Shell stud; 311. Anti-slip groove; 32. Rubber stopper; 33. Syringe retaining sleeve; 331. Sealing protrusion; 34. Annular sealing ring; 35. Threaded plate; 351. Slotted groove; 36. Silicone sealing gasket. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] As per the instruction manual Figure 1 , 2 As shown in Figures 3, 4, and 5, to ensure the sealing of the medicine inside the pre-filled syringe 1, a spiral connector 2 and a corresponding Luer lock cap 3 are fitted onto the injection port of the pre-filled syringe 1. The central through hole of the spiral connector 2 is a through hole, and the inner wall of the through hole is mostly rough, thereby increasing the friction force when the injection port of the pre-filled syringe 1 is inserted, ensuring the connection stability between the spiral connector 2 and the injection port of the pre-filled syringe 1. The Luer lock cap 3 includes a housing stud 31 that is threadedly connected to the spiral connector 2 and a rubber plug 32 that passes through the center of the housing stud 31. Below the rubber plug 32, there is a syringe retaining sleeve 33 that is connected to the cavity of the housing stud 31 through a snap-fit ​​structure. The rubber plug 32 and the syringe retaining sleeve 33 are an integrated structure. To prevent the rubber plug 32 from slipping out of the housing stud 31, there is a groove between the rubber plug 32 and the syringe retaining sleeve 33 for easy engagement. The interior of the housing stud 31 has a corresponding hollow retaining plate. For easy installation, the top of the hollow retaining plate is a slanted panel.

[0022] To ensure complete leak-proof sealing of the injection port of the pre-filled syringe 1, the bottom surface of the syringe fixing sleeve 33 is provided with a sealing protrusion 331 to seal the inner wall of the injection port of the pre-filled syringe 1. At the same time, to enhance the sealing effect, the inside of the syringe fixing sleeve 33 is provided with several annular sealing rings 34 that fit over the injection port of the pre-filled syringe 1. These annular sealing rings 34 provide multiple layers of protection for the injection port of the pre-filled syringe 1, thereby ensuring the sealing effect.

[0023] To facilitate the loosening of the connection between the housing stud 31 and the spiral connector 2, both the outer wall of the spiral connector 2 and the outer wall end of the housing stud 31 are provided with anti-slip grooves 311 to prevent hand slippage.

[0024] To prevent the rubber stopper 32 from falling off due to external force, the top surface of the housing stud 31 is provided with a threaded plate 35 that is connected to the cavity of the housing stud 31 by threads. The threaded plate 35 seals the bottom surface of the housing stud 31, preventing the rubber stopper 32 from being thrown out of the housing stud 31 due to external force. In order to ensure its sealing performance, a silicone sealing gasket 36 is provided between the rubber stopper 32 and the threaded plate 35. The silicone sealing gasket 36 has good elasticity and can be elastically deformed by compression, thereby ensuring the sealing performance of the rubber stopper 32. In addition, silicone has good water resistance, which can effectively prevent external liquids from corroding the rubber stopper. In order to facilitate the disassembly of the rubber stopper 32, after installing the threaded plate 35, there is no need to apply glue again for reinforcement.

[0025] Both the rubber stopper 32 and the syringe retainer 33 are made of butyl rubber. This material can ensure sealing while having good drug resistance and is commonly used in syringe pistons. In order not to affect the stability of the drug, the pre-filled syringe 1 is made of glass.

[0026] In practical implementation, when this utility model is needed, simply reverse the housing stud 31 and then pull the pre-filled syringe 1 out of the annular sealing ring 34. In order to adapt to different models of connecting needles, the selection of the spiral connector 2 needs to be changed in time according to the model of the connector. The annular sealing ring 34 and the syringe fixing sleeve 33 are integrated structures. Generally, the annular sealing ring 34 has good elasticity and a slightly smaller inner diameter to ensure its sealing performance. Similarly, after the pre-filled syringe 1 is filled, simply screw on the housing stud 31 to complete its sealing.

[0027] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A connector locking device for a Luer lock cap, comprising a pre-filled syringe (1), a screw connector (2) that is snapped onto the injection port of the pre-filled syringe (1), and a Luer lock cap (3) corresponding to the screw connector (2), wherein the Luer lock cap (3) comprises a housing stud (31) that is threadedly connected to the screw connector (2) and a rubber plug (32) passing through the center of the housing stud (31), wherein a syringe retaining sleeve (33) is provided below the rubber plug (32) and connected to the cavity of the housing stud (31) by a snap-fit ​​structure, characterized in that: The syringe fixing sleeve (33) has several annular sealing rings (34) inside that fit onto the injection port of the pre-filled syringe (1). The top surface of the housing stud (31) is provided with a threaded plate (35) that is connected to the cavity of the housing stud (31) by a thread. A silicone sealing gasket (36) is provided between the rubber stopper (32) and the threaded plate (35).

2. The joint locking device for a Luer lock cap according to claim 1, characterized in that: The outer wall end of the threaded plate (35) is provided with a slot (351) for easy disassembly.

3. The joint locking device for a Luer lock cap according to claim 1, characterized in that: The bottom surface of the syringe fixing sleeve (33) is provided with a sealing protrusion (331) to seal the inner wall of the injection port of the pre-filled syringe (1).

4. The joint locking device for a Luer lock cap according to claim 1, characterized in that: The outer wall of the spiral connector (2) and the outer wall end of the housing stud (31) are both provided with anti-slip grooves (311) to prevent hand slippage.

5. The joint locking device for a Luer lock cap according to claim 1, characterized in that: The rubber stopper (32) and the syringe retainer (33) are both made of butyl rubber, and the rubber stopper (32) and the syringe retainer (33) are an integrated structure.

6. The joint locking device for a Luer lock cap according to claim 1, characterized in that: The pre-filled syringe (1) is made of glass.

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