Hard cap for screw tip of syringe

Abstract

The utility model belongs to medical device technical field, specifically speaking is a kind of hard cap of screw head for syringe, including shell, its characterized in that: the inner core and internal cavity are arranged in the shell, the shell includes cylindrical structure, the top of cylindrical structure is equipped with cylinder mouth, the circular structure is fixedly connected in the shell, the circular groove is fixedly connected in the bottom of circular structure, the limit block is arranged in the internal cavity, the top direction of internal cavity is provided with rounded tip, the middle part of internal cavity is provided with sealing flange, the circular structure of the top inner wall of hard cap shell and inner core upper portion is clearance fit, it is convenient to top exhaust when wet heat sterilization, prevent the occurrence of air-trapping phenomenon.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically a spiral head hard cap for a syringe. Background Technology

[0002] With the development of the modern medical industry, the application of pre-filled syringes is becoming more and more widespread. Pre-filled syringes, also known as pre-filled syringes or pre-filled needles, are syringes in which drugs are pre-filled in polymer or glass tubes in a sterile environment. They are mainly composed of drugs, syringes, rubber stoppers, needle caps, and plungers, and combine the two functions of drug storage and injection.

[0003] Currently, the assembly structure of the hard-nut outer shell and inner core of pre-filled syringes has a significant impact on the performance and safety of the syringe. Some existing pre-filled syringe assembly structures have certain shortcomings in terms of sealing, ease of assembly, and prevention of accidental separation. For example, the inner wall of the top and the circular structure of the upper part of the inner core are interference fit, which is not conducive to top venting during moist heat sterilization and may cause air entrapment. Alternatively, the inner wall step of the outer shell and the groove of the outer wall of the inner core are clearance fit, which is beneficial for self-assembly but not for the overall sealing of the product. Therefore, a utility model is proposed to address the above problems. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model proposes a spiral head hard cap for syringes.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The present utility model provides a spiral head hard cap for syringes, including a shell, characterized in that: the shell is provided with an inner core and an internal cavity, the shell includes a cylindrical structure, the top of the cylindrical structure is provided with a cylindrical opening, a circular structure is fixedly connected inside the shell, a circular groove is fixedly connected to the bottom of the circular structure, a limiting block is provided in the internal cavity, a rounded tip is provided at the top of the internal cavity, and a sealing flange is provided in the middle of the internal cavity.

[0006] Preferably, the outer surface of the bottom of the outer shell is fixedly connected with a thread, the starting end and the end of the thread are respectively provided with a sharp corner structure, four axially extending ribs are provided between two adjacent major diameters of the thread, and a rounded notch is provided on the same side of two adjacent major diameters of the thread, and the outer diameter of the thread is smaller than the outer surface diameter of the cylinder.

[0007] Preferably, the outer surface of the cylindrical structure is fixedly connected with a prismatic block, which is narrower at the top and wider at the bottom.

[0008] Preferably, the bottom of the cylindrical structure is provided with an annular block, and the outer diameter of the annular block is larger than the outer diameter of the thread.

[0009] Preferably, a conical guide is fixedly connected to the bottom of the circular groove, a sealing flange is fixedly connected to the outside of the circular groove, a conical cavity is provided inside the conical guide, a sealing block is provided at the top of the conical cavity, and a sharp corner structure is provided inside the internal cavity.

[0010] Preferably, the bottom inner wall of the outer casing is provided with a positioning groove.

[0011] The beneficial effects of this utility model are: 1. This utility model provides a screw head hard cap for syringes, which uses a clearance fit between the top inner wall of the hard cap shell and the circular structure on the upper part of the inner core to facilitate top air venting during moist heat sterilization and prevent air entrapment.

[0012] 2. This utility model provides a spiral head hard cap for syringes. The sealing flange on the inner wall of the outer shell and the circular groove in the middle of the inner core have a zero gap, which enhances the sealing reliability. The circular positioning groove on the bottom inner wall of the outer shell and the columnar structure at the bottom of the inner core have a gap of 0.17mm, which increases the radial clearance and facilitates assembly. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the outer shell structure of this utility model; Figure 3 This is a schematic diagram of the bottom structure of this utility model; Figure 4 This is a schematic cross-sectional view of the present invention; Figure 5 This is a schematic diagram of the circular structure of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the sealing block of this utility model.

[0014] Legend: 1. Outer shell; 2. Inner core; 3. Internal cavity; 4. Cylindrical structure; 5. Cylindrical opening; 6. Prism-shaped block; 7. Thread; 8. Sharp corner structure; 9. Rib; 10. Rounded corner notch; 11. Annular block; 12. Limiting block; 13. Rounded corner tip; 14. Sealing flange; 15. Positioning groove; 16. Circular structure; 17. Conical guide; 18. Circular groove; 19. Conical cavity. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] Specific implementation examples are given below.

[0017] Please see Figures 1-6 This utility model provides a screw-type hard cap for a syringe, including a shell 1. The shell 1 contains an inner core 2 and an internal cavity 3. The shell 1 includes a cylindrical structure 4 with a cylindrical opening 5 at its top. A circular structure 16 is fixedly connected inside the shell 1, and a circular groove 18 is fixedly connected to the bottom of the circular structure 16. A limiting block 12 is provided inside the internal cavity 3. A rounded tip 13 is provided at the top of the internal cavity 3, and a sealing flange 14 is provided in the middle of the internal cavity 3. During operation, the inner core 2 has a special sealing structure at the connection point with the syringe cone. Conical cavities and protrusions are designed on the inner wall of the inner core 2. When the cap is tightened with the syringe body, these conical cavities and protrusions will tightly fit against the sealing surface corresponding to the syringe cone.

[0018] Furthermore, such as Figure 1 and Figure 2 As shown, the outer surface of the bottom of the outer shell 1 is fixedly connected with a thread 7. The starting end and the end of the thread 7 are respectively provided with a pointed structure 8. Four axially extending ribs 9 are provided between two adjacent major diameters of the thread 7. A rounded notch 10 is provided on the same side of two adjacent major diameters of the thread 7. The outer diameter of the thread 7 is smaller than the outer surface diameter of the cylinder. During operation, the thread 7 part of the nut shell 1 adopts a special design (rounded notch 10, ribs 9), which allows the thread 7 between the nut shell 1 and the syringe body to mesh tightly during tightening. At the same time, the height of the thread 7 is moderate, which can provide sufficient connection strength without increasing excessive tightening torque. In addition, multiple anti-slip protrusions or textures are provided on the outer surface of the nut shell 1. These anti-slip structures increase the friction between the hands of medical personnel and the nut shell 1 during operation, which allows for more stable force application when tightening or loosening the nut shell 1, further improving the stability of the connection and preventing the nut shell 1 from loosening during operation.

[0019] Furthermore, such as Figure 3As shown, a prismatic block 6 is fixedly connected to the outer surface of the cylindrical structure 4. The prismatic block 6 is narrower at the top and wider at the bottom. During operation, the overall structure of the nut housing 1 has also been improved. The top of the nut housing 1 is designed with a larger diameter and has a smooth edge, making it easy for medical personnel to hold with their fingers. At the same time, the length and diameter ratio of the nut housing 1 is reasonably designed, so that it can be easily aligned with the connection part of the syringe body for screwing during operation. In addition, due to the design of the sealing protrusion and the thread 7, while ensuring a stable seal and connection, it also takes into account the convenience of operation. This makes the operating force required for the installation and disassembly of the nut housing 1 moderate, which can effectively improve the efficiency of medical operations.

[0020] Furthermore, such as Figure 4 As shown, the bottom of the cylindrical structure 4 is provided with an annular block 11, and the outer diameter of the annular block 11 is larger than the outer diameter of the thread 7.

[0021] Furthermore, such as Figure 6 As shown, a conical guide body 17 is fixedly connected to the bottom of the circular groove 18, a sealing flange 14 is fixedly connected to the outside of the circular groove 18, a conical cavity 19 is provided inside the conical guide body 17, a sealing block is provided at the top of the conical cavity 19, and a sharp corner structure 8 is provided inside the internal cavity 3.

[0022] Furthermore, such as Figure 6 As shown, a positioning groove 15 is provided on the bottom inner wall of the outer casing 1.

[0023] Working Principle: The syringe inner core 2 features a special sealing structure at the connection point with the syringe cone. The inner wall of the inner core 2 has conical cavities and protrusions. When the nut is tightened with the syringe body, these conical cavities and protrusions fit tightly against the corresponding sealing surface of the syringe cone. The thread 7 of the nut housing 1 is specially designed to ensure a tight engagement between the nut housing 1 and the syringe body during tightening. Simultaneously, the thread height of thread 7 is moderate, providing sufficient connection strength without increasing excessive tightening torque. Furthermore, multiple anti-slip protrusions or textures are provided on the outer surface of the nut housing 1. These anti-slip structures increase the friction between the hands of medical personnel and the nut housing 1 during operation, making tightening or loosening the nut easier. The outer shell 1 allows for more stable force application, further improving the stability of the connection and preventing loosening of the nut outer shell 1 during operation. In addition to the optimized design of the sealing and connection structure mentioned above, which facilitates installation and disassembly, the overall structure of the nut outer shell 1 has also been improved. The top of the nut outer shell 1 is designed with a larger diameter and has smooth edges, making it easy for medical personnel to hold with their fingers. At the same time, the length and diameter ratio of the nut outer shell 1 is rationally designed, making it easy to align with the connection part of the syringe body for screwing during operation. Furthermore, the design of the sealing protrusion and the thread 7 ensures both a stable seal and connection while also taking into account the convenience of operation. This makes the operating force required for the installation and disassembly of the nut outer shell 1 moderate, effectively improving the efficiency of medical operations.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A spiral head hard cap for a syringe, comprising a housing (1), characterized in that: The outer shell (1) is provided with an inner core (2) and an inner cavity (3). The outer shell (1) includes a cylindrical structure (4). The top of the cylindrical structure (4) is provided with a cylindrical opening (5). A circular structure (16) is fixedly connected inside the outer shell (1). A circular groove (18) is fixedly connected to the bottom of the circular structure (16). A limiting block (12) is provided inside the inner cavity (3). A rounded tip (13) is provided at the top of the inner cavity (3). A sealing flange (14) is provided in the middle of the inner cavity (3).

2. The syringe screw head hard cap according to claim 1, characterized in that: The outer surface of the bottom of the outer shell (1) is fixedly connected with a thread (7). There are four axially extending ribs (9) between two adjacent major diameters of the thread (7). There are rounded notches (10) on the same side of two adjacent major diameters of the thread (7). The outer diameter of the thread (7) is smaller than the outer surface diameter of the cylinder.

3. A syringe screw-head hard cap according to claim 2, characterized in that: The cylindrical structure (4) has a prismatic block (6) fixedly connected to its outer surface. The prismatic block (6) is narrow at the top and wide at the bottom.

4. A syringe screw-head hard cap according to claim 3, characterized in that: The bottom of the cylindrical structure (4) is provided with an annular block (11), the outer diameter of which is greater than the outer diameter of the thread (7).

5. A syringe screw-head hard cap according to claim 1, characterized in that: The bottom of the circular groove (18) is fixedly connected to a conical guide body (17), and a sealing flange (14) is fixedly connected to the outside of the circular groove (18). A conical cavity (19) is provided inside the conical guide body (17), and a sealing block is provided at the top of the conical cavity (19). A sharp corner structure (8) is provided inside the internal cavity (3).

6. A syringe screw-head hard cap according to claim 5, characterized in that: The bottom inner wall of the outer shell (1) is provided with a positioning groove (15).

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