Pre-filled syringe for preventing leakage of liquid medicine

Abstract

The utility model belongs to the technical field of filling and sealing auxiliary tools, and particularly discloses a pre-filling and sealing injector used for preventing liquid medicine leakage, which comprises a sealing cap, a needle cylinder, a piston and a push rod, the piston is connected with the push rod, the piston is positioned in the needle cylinder, the sealing cap is in threaded connection with the needle cylinder, the end part of the needle cylinder is connected with a plug, and the plug is positioned in the needle cylinder. A groove is formed between the plug and the needle cylinder to form a weak structure, the groove position of the plug can be broken, and the plug can be inserted into the sealing cap. The sealing performance of the needle cylinder can be improved, and it is guaranteed that the Ruhr conical head of the needle cylinder is in a sterile state.

Description

Technical Field

[0001] The utility model relates to the technical field of filling auxiliary tools, in particular to a pre-filled syringe for preventing liquid medicine from leaking. Background Art

[0002] Traditional prefilled auxiliary tool syringes are mostly packaged by tightening the cap with the thread of the plastic syringe. This method may cause the cap to loosen during production and transportation, leading to safety hazards such as drug leakage and contamination. If the syringe port is only sealed with a cap, it cannot guarantee that the Luer cone head of the syringe is sterile, so leakage and contamination may still occur. Utility Model Content

[0003] The utility model provides a pre-filled syringe for preventing liquid medicine from leaking, aiming to improve the sealing performance of the syringe and ensure that the Luer cone head of the syringe is in a sterile state.

[0004] The utility model is realized through the following technical scheme: a prefilled syringe for preventing liquid medicine from leaking, comprising a sealing cap, a syringe, a piston and a push rod, wherein the piston is connected to the push rod, the piston is located in the syringe, the sealing cap is threadedly connected to the syringe, a plug is connected to the end of the syringe, a groove is provided between the plug and the syringe to form a weakened structure, the groove position of the plug can be broken, and the plug can be inserted into the sealing cap.

[0005] Compared with the prior art, the utility model has the following advantages and beneficial effects: the utility model provides a plugging head, which can block the syringe and ensure that the Luer cone of the syringe is in a sterile state. The plugging and sealing effect of the syringe can be further enhanced under the action of the sealing cap.

[0006] Since the sealing cap is threadedly connected to the end of the syringe, after long-term use, the connection between the sealing cap and the syringe is prone to loosening, causing the sealing cap to retreat as the thread spirals backward, affecting the sealing. The new syringe structure of this solution is to design a break-off structure plug to close the syringe at the traditional syringe port. The plug can reseal the end of the syringe, so that the end of the syringe is double-sealed by the threaded connection of the sealing cap and the plugging of the plug, which further ensures the sealing of the product and prevents the liquid from overflowing from the syringe.

[0007] In addition, if the syringe port is only sealed, the sterility of the Luer cone of the syringe cannot be guaranteed. The technical solution of this solution improves the structure of the traditional sealing cap, and the sealing cap can wrap the broken structure and the Luer cone, thereby ensuring the sterility and leakage of the product.

[0008] The groove provided between the plug and the syringe in this solution makes the connection between the plug and the syringe relatively thin, forming a weak structure, so that the plug can be broken off when needed later.

[0009] Furthermore, the end of the syringe is connected to a connecting cylinder, and the connecting cylinder includes an outer cylinder and an inner cylinder coaxially arranged, the inner cylinder is communicated with the syringe, the sealing cap is inserted between the inner cylinder and the outer cylinder and is threadedly matched with the outer cylinder, the plug is connected to the end of the inner cylinder, and the groove is located at the connection position between the plug and the inner cylinder.

[0010] Beneficial effect: The structure of the connecting tube in this solution is the Luer cone head structure of the syringe, the plug blocks the inner tube, thereby sealing the syringe, and the groove is arranged between the plug and the inner tube, which is convenient for breaking off the plug for use.

[0011] Furthermore, the plug is conical, and the sealing cap includes a conical cylinder and a sealing cylinder. One end of the conical cylinder is connected to one end of the sealing cylinder, and the conical cylinder and the sealing cylinder are connected to each other. A conical hole for accommodating the plug is provided in the conical cylinder, and the sealing cylinder is threadedly matched with the outer cylinder.

[0012] Beneficial effect: In this solution, the plug is conical, which is convenient for insertion into the sealing cap, and the sealing cap includes a conical cylinder and a sealing cylinder, and a conical hole for accommodating the plug is provided in the conical cylinder, so that the plug can be easily inserted into the conical cylinder and matched with the conical hole inside the conical cylinder.

[0013] Furthermore, a screw plate is connected to the outer side of the sealing cylinder and one end close to the cone cylinder.

[0014] Beneficial effect: The setting of the screw plate in this solution facilitates the screwing of the entire sealing cap and the threaded connection between the end of the syringe.

[0015] Furthermore, the twisting plate is ring-shaped.

[0016] Beneficial effect: The annular screw plate is more convenient for manual operation.

[0017] Furthermore, the outer periphery of the twisting plate is provided with anti-slip grooves.

[0018] Beneficial effect: The anti-slip pattern can prevent slipping during the process of twisting the twisting plate.

[0019] Furthermore, the end of the plug, the end of the tapered hole away from the sealing cylinder, and the end of the tapered cylinder are all arc ends.

[0020] Beneficial effect: The setting of the arc end in this solution can make the plug and the tapered hole highly matched, and the end is an arc end which is not easy to injure the user during use.

[0021] Furthermore, the groove is an annular groove.

[0022] Beneficial effect: The annular groove structure can make the plug easier to break.

[0023] Furthermore, the end of the inner tube extends out of the outer tube.

[0024] Beneficial effect: The inner cylinder in the present solution is partially extended, which is convenient for processing and manufacturing the plug and for breaking off the plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] Figure 1 This is a front view of an embodiment of a pre-filled syringe for preventing liquid medicine leakage according to the utility model;

[0027] Figure 2 It is a longitudinal cross-sectional view of an embodiment of a pre-filled syringe for preventing liquid medicine leakage according to the utility model;

[0028] Figure 3 It is a longitudinal cross-sectional view of a syringe in an embodiment of a prefilled syringe for preventing liquid medicine leakage of the utility model;

[0029] Figure 4 It is a schematic diagram of the state after the plug is broken off in an embodiment of a prefilled syringe for preventing liquid medicine leakage of the utility model.

[0030] Marks and corresponding parts names in the attached drawings:

[0031] Sealing cap 1, conical cylinder 101, screw plate 102, sealing cylinder 103, conical hole 104, syringe 2, outer cylinder 201, inner cylinder 202, piston 3, push rod 4, plug 5. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] like Figure 1-Figure 3 As shown, this embodiment provides a prefilled syringe for preventing liquid medicine from leaking, comprising a sealing cap 1, a syringe 2, a piston 3 and a push rod 4, wherein the piston 3 is connected to the push rod 4, the piston 3 is located in the syringe 2, the sealing cap 1 is threadedly connected to the syringe 2, a plug 5 is connected to the end of the syringe 2, a groove is provided between the plug 5 and the syringe 2 to form a weak structure, the groove position of the plug 5 can be broken, and the plug 5 can be inserted into the sealing cap 1, specifically:

[0038] The end of the syringe 2 is connected with a connecting tube, which is the Luer cone head at the end of the syringe 2. The connecting tube includes an outer tube 201 and an inner tube 202 which are coaxially arranged. The inner tube 202 is communicated with the syringe 2, and the end of the inner tube 202 extends out of the outer tube 201. The sealing cap 1 is inserted between the inner tube 202 and the outer tube 201 and is threadedly matched with the outer tube 201. The plug 5 is connected to the end of the inner tube 202, and the groove is located at the connection position between the plug 5 and the inner tube 202. In this embodiment, the plug 5 and the end of the inner tube 202 are integrally injection molded, and the plug 5 and the syringe 2 are both made of polypropylene material. The polypropylene material has a certain degree of brittleness. Since a groove is provided at the connection between the plug 5 and the inner tube 202, the groove forms a weak structure here, combined with Figure 4 As shown, when the user pries the plug 5 with force, the plug 5 can be broken, so that the inner tube 202 at the end of the syringe 2 is in an open state.

[0039] In this embodiment, the groove is an annular groove, so that the thickness of the connection between the plug 5 and the inner tube 202 is more uniform, which makes it easier for the plug 5 to be broken.

[0040] like Figure 2 and Figure 3 As shown, in this embodiment, the plug 5 is conical, and the sealing cap 1 includes a cone 101 and a sealing cylinder 103. One end of the cone 101 is connected to one end of the sealing cylinder 103. In this embodiment, the cone 101 and the sealing cylinder 103 are integrally formed, and the cone 101 and the sealing cylinder 103 are connected to each other. A cone hole 104 for accommodating the plug 5 is provided in the cone 101. In this embodiment, the end of the plug 5, the end of the cone hole 104 away from the sealing cylinder 103, and the end of the cone 101 are all arc ends, which can prevent the ends of the plug 5 and the cone 101 from being too sharp and stabbing the user.

[0041] The inner wall of the outer cylinder 201 is provided with an internal thread, and the outer wall of the sealing cylinder 103 is provided with an external thread. The sealing cylinder 103 is inserted between the outer cylinder 201 and the inner cylinder 202, and the sealing cylinder 103 and the inner wall thread of the outer cylinder 201 are matched.

[0042] like Figure 1 As shown, a screw plate 102 is connected to the outer side of the sealing tube 103 and one end close to the conical tube 101. The screw plate 102 is annular and is sleeved on the outer periphery of the sealing tube 103. In this embodiment, the screw plate 102 and the sealing tube 103 are integrally formed. The outer periphery of the screw plate 102 is provided with anti-slip grooves. The setting of the anti-slip grooves can avoid slipping when the sealing cap 1 and the end of the syringe 2 are threadedly connected.

[0043] The specific implementation process is as follows: the push rod 4 is pulled out of the syringe 2, and then the medicine is poured into the end of the syringe 2, and then the push rod 4 is inserted into the end of the syringe 2 to seal it. When the medicine in the syringe 2 needs to be used, the sealing cap 1 is first unscrewed, and then the plug 5 is broken off with force, and finally the Luer cone head at the end of the syringe 2 is connected to the use end.

[0044] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A prefilled syringe for preventing liquid medicine from leaking, comprising a sealing cap, a syringe, a piston and a push rod, wherein the piston is connected to the push rod, the piston is located in the syringe, and the sealing cap is threadedly connected to the syringe, characterized in that: The end of the syringe is connected with a plug, and a groove is provided between the plug and the syringe to form a weak structure. The groove position of the plug can be broken, and the plug can be inserted into the sealing cap.

2. A prefilled syringe for preventing liquid medicine leakage according to claim 1, characterized in that: The end of the syringe is connected to a connecting cylinder, which includes an outer cylinder and an inner cylinder arranged coaxially, the inner cylinder is communicated with the syringe, the sealing cap is inserted between the inner cylinder and the outer cylinder and is threadedly matched with the outer cylinder, the plug is connected to the end of the inner cylinder, and the groove is located at the connection position between the plug and the inner cylinder.

3. A prefilled syringe for preventing drug liquid leakage according to claim 2, characterized in that: The plug is conical, and the sealing cap includes a conical cylinder and a sealing cylinder. One end of the conical cylinder is connected to one end of the sealing cylinder, and the conical cylinder and the sealing cylinder are communicated with each other. A conical hole for accommodating the plug is provided in the conical cylinder, and the sealing cylinder is threadedly matched with the outer cylinder.

4. A prefilled syringe for preventing liquid medicine leakage according to claim 3, characterized in that: The outer side of the sealing cylinder and one end close to the cone cylinder is connected with a screw plate.

5. A prefilled syringe for preventing liquid medicine leakage according to claim 4, characterized in that: The twisting plate is ring-shaped.

6. A prefilled syringe for preventing liquid medicine leakage according to claim 5, characterized in that: The outer periphery of the twisting plate is provided with anti-slip grooves.

7. A prefilled syringe for preventing liquid medicine leakage according to claim 3, characterized in that: The end of the plug, the end of the tapered hole away from the sealing cylinder and the end of the tapered cylinder are all arc ends.

8. A prefilled syringe for preventing liquid medicine leakage according to claim 1, characterized in that: The groove is an annular groove.

9. A prefilled syringe for preventing drug liquid leakage according to any one of claims 2 to 7, characterized in that: An end of the inner cylinder extends out of the outer cylinder.

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