Luer lock protective cap

Abstract

The utility model discloses a Luer lock protective cap which comprises a protective cap body and a rubber plug which are matched with each other, the upper portion of the inner wall of the protective cap body is provided with a plurality of limiting protruding blocks, the bottom of each limiting protruding block is provided with a limiting plane, and the upper portion of each limiting protruding block is provided with a guide portion with the section gradually increasing from top to bottom. Compared with the prior art, the protective cap has the advantages that the protective cap is simple and reasonable in structure and convenient to machine, the limiting protruding block is arranged on the upper portion of the inner wall of the protective cap body, the section of the upper portion of the limiting protruding block is gradually increased from top to bottom so that a rubber plug can be smoothly installed in the protective cap body, the limiting plane is arranged at the bottom of the limiting protruding block, the installed rubber plug is axially limited, and the service life of the rubber plug is prolonged. Therefore, the situation that the rubber plug axially displaces when the Luer lock protective cap is screwed into the clamping cap is avoided, the sealing performance of the Luer lock protective cap is guaranteed, and the sealing reliability of the Luer lock protective cap is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to luer lock cap manufacturing technical field, specifically a luer lock cap. BACKGROUND

[0002] The pre-filled syringe is widely used in medical industry, with the increasing demand, the safety is also increasingly concerned by people. The existing pre-filled syringe is mostly glass needle tube structure, the structure is connected with the hard plastic cap with internal thread in the cone head part of glass needle tube, and then the luer lock cap is connected to ensure the overall sterility.

[0003] The existing luer lock cap mainly includes cap body and rubber plug arranged in the cap body, wherein the rubber plug is a sealing part, for example, the patent application with the application number CN201720176809.9 and the name "a pre-filled syringe luer lock cap" discloses a luer lock cap structure which is composed of plastic sleeve and rubber plug, but the existing luer lock cap will cause slight axial movement of the rubber plug when being screwed into the cap, so that some luer lock caps will appear the situation of not being tightly sealed, therefore, the existing luer lock cap needs to be further improved. UTILITY MODEL CONTENTS

[0004] The utility model aims at making up for the above-mentioned shortage, and discloses a luer lock cap which is simple and reasonable in structure, convenient to process and can effectively prevent the axial movement of the rubber plug when the luer lock cap is screwed in.

[0005] The technical scheme of the utility model is implemented as follows:

[0006] A luer lock cap comprises a cap body and a rubber plug which are matched, a plurality of limiting protrusions are arranged on the inner wall of the cap body, the bottom of the limiting protrusion is provided with a limiting plane, and the upper part of the limiting protrusion is provided with a guide part with gradually increasing cross section from top to bottom.

[0007] The measures for further optimizing the technical scheme are as follows:

[0008] As an improvement, the outer surface of the guide part is a conical surface.

[0009] As an improvement, the outer surface of the guide part is an inclined surface.

[0010] As an improvement, the outer surface of the guide part is an outward convex circular surface.

[0011] As an improvement, the outer surface of the guide part is an inward concave circular surface.

[0012] The guide part of the limiting bump has a structure that its cross section gradually increases from top to bottom, so that the rubber plug can be smoothly assembled into the cap body without damaging the rubber plug.

[0013] As an improvement, the number of the limiting bump is 4-8.

[0014] As an improvement, the limiting bump and the cap body are integrally formed. The integral structure is convenient to process.

[0015] As an improvement, the outer wall of the cap body is uniformly provided with anti-skid bumps. The anti-skid bumps can increase the friction of the outer surface and facilitate the force exertion when rotating the cap body.

[0016] As an improvement, the inner cavity wall of the rubber plug is a conical structure that is small at the top and large at the bottom. In this way, the rubber plug and the cap combination part are in linear contact, so as to ensure the sealing performance.

[0017] As an improvement, the inner cavity of the rubber plug is provided with a protrusion. The protrusion can block the center hole of the cap, so as to ensure the sealing performance.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The present application has the following advantages: the cap is simple and reasonable in structure, convenient to process, and provided with a limiting bump on the inner wall of the cap body. The upper part of the limiting bump is provided with a guide part, and the cross section of the guide part gradually increases from top to bottom, so that the rubber plug can be smoothly assembled into the cap body. The bottom of the limiting bump is provided with a limiting plane, which axially limits the rubber plug, so as to avoid the axial displacement of the rubber plug when the luer lock cap is screwed into the cap, ensure the sealing performance of the luer lock cap, and improve the reliability of the luer lock cap. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of the embodiment one of the present application;

[0021] Figure 2 is a sectional view of the embodiment one of the present application;

[0022] Figure 3 is Figure 2 is an enlarged view of A part in the figure;

[0023] Figure 4 is a sectional view of the cap body of the embodiment two of the present application;

[0024] Figure 5 is Figure 4 is an enlarged view of B part in the figure;

[0025] Figure 6This is a partial enlarged view of the upper limit protrusion portion of the cap body in Embodiment 3 of this utility model;

[0026] Figure 7 This is a partial enlarged view of the upper limit protrusion portion of the cap body in Embodiment 4 of this utility model.

[0027] The names of the reference numerals in the accompanying drawings of this utility model are:

[0028] The cap body 1, anti-slip protrusion 11, rubber plug 2, inner cavity wall 2a, protrusion 21, limiting protrusion 3, limiting plane 3a, guide part 31. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings:

[0030] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0031] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0032] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0033] Example 1, as Figures 1 to 3 As shown, a Luer lock cap includes a matching cap body 1 and a rubber plug 2. The upper part of the inner wall of the cap body 1 is provided with a plurality of limiting protrusions 3. The bottom of the limiting protrusions 3 is provided with a limiting plane 3a. The upper part of the limiting protrusions 3 is provided with a guide portion 31 whose cross-section gradually increases from top to bottom.

[0034] In this embodiment, the outer surface of the guide portion 31 is a conical surface.

[0035] In this embodiment, there are four limiting protrusions 3. The four limiting protrusions 3 are evenly distributed on the circumferential surface.

[0036] Generally, the number of limiting protrusions 3 is 4-8. If the number of limiting protrusions 3 is too small, it will easily cause insufficient blocking force; while if the number of limiting protrusions 3 is too large, it will cause excessive resistance when the rubber stopper 2 is inserted.

[0037] The limiting protrusion 3 and the cap body 1 are integrally formed. This integral structure facilitates processing.

[0038] The outer wall of the cap body 1 is uniformly provided with anti-slip protrusions 11. The anti-slip protrusions 11 are provided to increase the friction of the outer wall of the cap body 1, so as to facilitate the application of force when turning the Luer lock cap.

[0039] The inner wall 2a of the rubber stopper 2 is a conical structure that is smaller at the top and larger at the bottom.

[0040] The inner cavity of the rubber stopper 2 has a protrusion 21 at its center.

[0041] The cap has a central tube with a central hole. The inner wall 2a has a conical structure, ensuring line contact between the rubber stopper and the cap to guarantee a seal. When the Luer lock cap is screwed in, the protrusion 21 blocks the outlet of the central hole to ensure a seal.

[0042] Example 2, as Figures 4 to 5 As shown, the structure of this embodiment is similar to that of Embodiment 1, except that the outer surface of the guide portion 31 is inclined in this embodiment. In this embodiment, the number of limiting protrusions 3 is also four.

[0043] Example 3, as Figure 6 As shown, the structure of this embodiment is similar to that of Embodiment 1, except that the outer surface of the guide portion 31 is an outwardly convex arc surface. In this embodiment, the number of limiting protrusions 3 is also 4.

[0044] Example 4, as Figure 7 As shown, the structure of this embodiment is similar to that of Embodiment 1, except that the outer surface of the guide portion 31 is an inwardly concave arc surface.

[0045] The Luer lock cap structure of the utility model, through setting the limiting lug 3 on the inner wall upper portion of the cap body, the upper portion of the limiting lug 3 is provided with a guide portion 31, the rubber plug 2 is squeezed into the cap body 1 from top to bottom when assembling, the cross section of the guide portion 31 gradually increases from top to bottom, so as to ensure that the rubber plug 2 can be smoothly assembled into the cap body 1, and the bottom of the limiting lug 3 is provided with a limiting plane 3a, the rubber plug 2 being assembled is axially limited, so that the situation that the rubber plug 2 axially shifts when the Luer lock cap is screwed into the clamping cap is avoided, and the reliability of the Luer lock cap sealing is improved.

[0046] The above is only the preferred embodiment of the utility model, and does not limit the implementation and protection scope of the utility model, and for those skilled in the art, it should be realized that the scheme obtained by equivalent replacement and obvious change of the utility model specification and drawing content should be contained in the protection scope of the utility model.

Claims

1. A luer lock cap comprising a cap body (1) and a rubber plug (2) adapted to each other, characterized in that: The inner wall upper portion of the cap body (1) is provided with a plurality of limiting protrusions (3), the bottom of the limiting protrusion (3) is provided with a limiting plane (3a), and the upper portion of the limiting protrusion (3) is provided with a guide portion (31) with gradually increasing cross section from top to bottom.

2. A luer lock cap according to claim 1, characterized in that: The outer surface of the guide portion (31) is a conical surface.

3. A luer lock cap according to claim 1, characterized in that: The outer surface of the guide portion (31) is an inclined surface.

4. The luer lock cap of claim 1, wherein: The outer surface of the guide portion (31) is an outward convex circular arc surface.

5. The luer lock cap of claim 1, wherein: The outer surface of the guide portion (31) is an inward concave circular arc surface.

6. A luer lock cap according to any one of claims 2 to 5, characterised in that: The number of the limiting protrusions (3) is 4-8.

7. A luer lock cap according to claim 6, characterised in that: The limiting protrusion (3) and the cap body (1) are an integral structure.

8. A luer lock cap according to claim 7, characterized in that: The outer wall of the cap body (1) is uniformly provided with anti-skid protrusions (11).

9. A luer lock cap according to claim 8, characterized in that: The inner cavity wall (2a) of the rubber plug (2) is a conical structure with small upper portion and large lower portion.

10. A luer lock cap according to claim 9, characterized in that: The inner cavity of the rubber plug (2) is provided with a protrusion (21).

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