Easy-to-break sealed prefilled syringe

Abstract

An easy-to-break sealed prefilled syringe, comprising: an injection assembly (100), used for containing a liquid medicine and injecting the liquid medicine under a preset pressure; an easy-to-break cap (200), connected to an injection end of the injection assembly (100) and used for being integrally injection-molded with the injection end of the injection assembly (100), so as to seal the injection end of the injection assembly (100); an injection needle, used for, after the easy-to-break cap (200) is broken, being inserted and fitted into the injection end of the injection assembly (100) to inject the liquid medicine; and a pressure applying assembly (300), inserted and fitted into a pressure receiving end of the injection assembly (100) and used for applying a preset pressure to an inner cavity of the injection assembly (100).

Description

Prefilled syringes with snap-on seals Technical Field

[0001] The present invention relates to the technical field of drug injection, in particular to a pre-filled syringe with an easy-to-break seal. Background Art

[0002] Prefilled syringes are syringes that contain injectable drugs directly, combining the syringe and the drug packaging container into one, so that the drug can be injected directly when used.

[0003] For example, Chinese invention patent CN217854071U discloses a prefilled syringe comprising a syringe barrel, a protective cap, a locking cover, and a rubber stopper. The protective cap is attached to the injection end of the syringe barrel; the locking cover is detachably connected to the protective cap; and the rubber stopper is connected to the locking cover and seals the injection end. The prefilled syringe has a simple structure, is easy to use, and has a good seal, effectively preventing leakage.

[0004] However, in the above-mentioned prefilled syringe, the injection end of the syringe barrel is sealed by squeezing the protective cap, locking cover and rubber stopper. Although this can improve the sealing and prevent leakage, the squeezing fit is easy to loosen during long-term storage, and there is a risk of external gas infiltration and internal gas leakage, which greatly affects the quality of the internal liquid medicine and is not conducive to long-term storage and large-scale industrial production.

[0005] Summary of the Invention

[0006] The present invention provides a prefilled syringe with an easy-to-break seal, which solves the technical problems that the injection end of the existing prefilled syringe adopts an extrusion-fit seal, the extrusion fit is easy to loosen after long-term storage, the sealing is relatively poor, there is a risk of gas infiltration and leakage, and the quality of the liquid medicine is difficult to ensure.

[0007] According to one aspect of the present invention, a foldable sealed prefilled syringe is provided, comprising an injection assembly for containing a medicinal solution and injecting the medicinal solution under a preset pressure; a foldable cap connected to the injection end of the injection assembly and used to be integrally injection molded with the injection end of the injection assembly to seal the injection end of the injection assembly; an injection needle used to be plugged into and fitted with the injection end of the injection assembly to inject the medicinal solution after the foldable cap is broken; and a pressure-applying assembly plugged into and fitted with the pressure-receiving end of the injection assembly to apply a preset pressure to the inner cavity of the injection assembly.

[0008] As a further improvement of the above technical solution:

[0009] Furthermore, the foldable cap includes an foldable portion connected to the injection end of the injection assembly and a force-applying portion connected to the foldable portion, and the volume of the force-applying portion is greater than the volume of the foldable portion.

[0010] Furthermore, an output portion arranged in a conical shape and fixedly connected to the easily foldable portion is provided on the injection end of the injection component, and the output portion is provided with an output cavity arranged in a conical shape for outputting the liquid medicine.

[0011] Furthermore, the injection assembly includes a syringe for respectively accommodating liquid medicine and medicine, a separating piston arranged in the syringe for dividing the inner cavity of the syringe into a first accommodating cavity and a second accommodating cavity and moving in the inner cavity of the syringe under the action of a preset pressure applied by the injection assembly, and a connecting groove formed by a protrusion outward on the inner wall of the syringe for accommodating the separating piston to connect the first accommodating cavity and the second accommodating cavity after the pressure-applying assembly applies a preset pressure to the separating piston.

[0012] Furthermore, the pressure assembly includes a pressure piston extending from the pressure-receiving end of the syringe into the syringe and sealingly fitting with the inner wall of the syringe, and a pressure push rod connected to the pressure piston and extending outside the syringe.

[0013] Furthermore, the pressure-bearing end of the syringe is provided with a pressure port for opening outward to allow the pressure piston to extend into the syringe, and the edge of the pressure port is provided with a mounting edge extending radially outward. The syringe also includes a sealing cover that is sleeved on the outside of the pressure push rod and covers the mounting edge for sealing the pressure port and limiting the pressure piston and guiding the pressure push rod.

[0014] Furthermore, the edge of the sealing cover is provided with a holding portion which wraps around the edge of the mounting edge and is used for elastically holding the mounting edge.

[0015] Furthermore, a guide hole is provided in the middle of the sealing cover and is threadedly connected to the pressure push rod, so that the pressure push rod can extend into the injection barrel to rotate and push the pressure piston to move.

[0016] Furthermore, a pressure handle extending radially outward is provided at the end of the pressure push rod away from the pressure piston.

[0017] Furthermore, a sealing ring is provided between the pressure piston and the sealing cover, which is sleeved on the outside of the pressure push rod and seals against the inner wall of the injection barrel.

[0018] The present invention has the following beneficial effects:

[0019] The easy-to-fold and sealed pre-filled syringe of the present invention is pre-filled with the medicine to be injected into the injection component during the manufacturing process of the injection component. When the syringe is used, force is first applied to break the easy-to-fold cap, and then the injection needle is inserted. A preset pressure is applied to the inner cavity of the injection component through the pressure-applying component to inject the medicine under the action of the preset pressure to achieve medicine injection. This solution realizes medicine injection through the injection component, the easy-to-fold cap, the injection needle and the pressure-applying component, and adopts the easy-to-fold cap to achieve the sealing of the injection end of the injection component. Compared with the existing technology, the easy-to-fold cap and the injection end of the injection component are integrally injection-molded as a whole, which greatly improves the sealing performance and minimizes the risk of gas infiltration and leakage from the injection end of the injection component, thereby ensuring the quality of the medicine pre-filled in the injection component. It can be stored and accommodated for a long time, and has a simple structure, which is conducive to large-scale industrial production. The easy-to-fold cap is also easy to break, open and use, has strong practicality, and is suitable for wide promotion and application.

[0020] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] FIG1 is a schematic structural diagram of a foldable sealed prefilled syringe according to a preferred embodiment of the present invention;

[0023] FIG2 is a schematic structural diagram of a foldable sealed prefilled syringe according to a preferred embodiment of the present invention;

[0024] FIG3 is a cross-sectional view of a pre-filled syringe with a frangible seal according to a preferred embodiment of the present invention.

[0025] Legend: 100, injection assembly; 110, output part; 120, syringe; 121, mounting edge; 122, sealing cover; 123, holding part; 130, separating piston; 140, connecting groove; 200, foldable cap; 210, foldable part; 220, force-applying part; 300, pressure-applying assembly; 310, pressure-applying piston; 320, pressure-applying push rod; 330, pressure-applying handle. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0027] Figure 1 is a schematic structural diagram of a pre-filled syringe with a foldable seal according to a preferred embodiment of the present invention; Figure 2 is a schematic structural diagram of a pre-filled syringe with a foldable seal according to a preferred embodiment of the present invention; Figure 3 is a cross-sectional view of a pre-filled syringe with a foldable seal according to a preferred embodiment of the present invention.

[0028] As shown in Figure 1, the foldable sealed prefilled syringe of this embodiment includes an injection component 100, which is used to contain liquid medicine and inject the liquid medicine under a preset pressure; a foldable cap 200, which is connected to the injection end of the injection component 100 and is used to be integrally injection molded with the injection end of the injection component 100 to seal the injection end of the injection component 100; an injection needle, which is used to be plugged into and matched with the injection end of the injection component 100 after the foldable cap 200 is broken to inject liquid medicine; and a pressure-applying component 300, which is plugged into and matched with the pressure-receiving end of the injection component 100 and is used to apply a preset pressure to the inner cavity of the injection component 100. Specifically, the foldable sealed pre-filled syringe of the present invention is pre-filled with the liquid to be injected into the injection component 100 during the manufacturing process of the injection component 100. When the syringe is used, the foldable cap 200 is first broken off by force, and then the injection needle is inserted. A preset pressure is applied to the inner cavity of the injection component 100 by the pressure-applying component 300 to inject the liquid medicine under the action of the preset pressure to achieve liquid medicine injection. This solution realizes liquid medicine injection through the injection component 100, the foldable cap 200, the injection needle and the pressure-applying component 300, and adopts the foldable cap 200. The foldable cap 200 and the injection end of the injection assembly 100 are integrally molded to seal the injection end. Compared to the prior art, the foldable cap 200 and the injection end of the injection assembly 100 are integrally injection molded, significantly improving the sealing performance and minimizing the risk of gas infiltration and leakage from the injection end of the injection assembly 100. This ensures the quality of the pre-filled liquid medicine within the injection assembly 100 and allows for long-term storage and storage. The simple structure facilitates large-scale industrial production. The foldable cap 200 is also easy to break, open, and use, making it highly practical and suitable for widespread promotion and application. Optionally, the syringe also includes an anti-folding cap that is mounted on the outside of the foldable cap 200 and connected to the injection assembly 100 to prevent accidental folding of the foldable cap 200.

[0029] As shown in FIG1 , in this embodiment, the easily foldable cap 200 includes an easily foldable portion 210 connected to the injection end of the injection assembly 100 and a force-applying portion 220 connected to the easily foldable portion 210. The volume of the force-applying portion 220 is larger than that of the easily foldable portion 210. Specifically, the volume of the force-applying portion 220 is larger than that of the easily foldable portion 210, so that the pressure-bearing area of ​​the force-applying portion 220 is relatively large, which facilitates force application. At the same time, the strength of the easily foldable portion 210 is relatively low, which facilitates breaking. As a result, force can be easily applied to the force-applying portion 220 to break the easily foldable portion 210, thereby opening the injection end of the injection assembly 100 for inserting the injection needle and injecting the liquid medicine.

[0030] As shown in Figure 3, in this embodiment, the injection end of the injection assembly 100 is provided with a tapered output portion 110 fixedly connected to the easily breakable portion 210. The output portion 110 defines a tapered output cavity for dispensing the drug solution. Specifically, the tapered output portion 110 forms a tapered output cavity, facilitating the collection of drug solution within the cavity. After the easily breakable portion 210 breaks, the cavity mates with the injection needle, enabling drug injection and preventing residual drug.

[0031] As shown in Figure 3, in this embodiment, the injection component 100 includes a syringe 120 for respectively containing liquid medicine and medicine, a separating piston 130 arranged in the syringe 120 for separating the inner cavity of the syringe 120 into a first accommodating cavity and a second accommodating cavity and moving in the inner cavity of the syringe 120 under the action of a preset pressure applied by the injection component 100, and a connecting groove 140 formed on the inner wall of the syringe 120 to accommodate the separating piston 130 to connect the first accommodating cavity and the second accommodating cavity after the pressure-applying component 300 applies a preset pressure to the separating piston 130. Specifically, the first chamber holds liquid medicine, while the second chamber holds medication. When the pressure assembly 300 pushes the liquid medicine to apply a preset pressure to the separating piston 130, the separating piston 130 moves within the inner cavity of the syringe 120, allowing the connecting chamber to accommodate the separating piston 130 and connect the first and second chambers, allowing the two medications to mix. This achieves medication dispensing in a fully sealed environment, preventing contamination. Furthermore, the medication can be a soluble solid medication. By mixing the liquid medicine and the soluble solid medication, the soluble solid medication dissolves in the liquid medicine and is then injected into the patient, significantly expanding the range of medication options. Alternatively, in another embodiment, the first chamber holds medication, while the second chamber holds liquid medicine. Alternatively, the output chamber communicates with the second chamber. Alternatively, the output chamber communicates with the first chamber. Optionally, the inner wall of the syringe 120 is provided with a stopper protrusion corresponding to the connecting groove 140. This stopper protrusion can only pass through the stopper protrusion when the pressure assembly 300 further increases the preset pressure, ensuring sufficient mixing of the medications in the first and second chambers.

[0032] As shown in FIG3 , in this embodiment, the pressure-applying assembly 300 includes a pressure-applying piston 310 extending from the pressure-receiving end of the syringe 120 into the syringe 120 and sealingly engaging the inner wall of the syringe 120, and a pressure-applying push rod 320 connected to the pressure-applying piston 310 and extending outside the syringe 120. Specifically, by applying a force to the pressure-applying push rod 320, the pressure-applying piston 310 is driven to move within the syringe 120, thereby applying a preset pressure to the separation piston 130 to achieve injection of the drug solution.

[0033] As shown in FIG3 , in this embodiment, the pressure-receiving end of the syringe 120 is provided with a pressure port that is opened outward to allow the pressure piston 310 to extend into the syringe 120. The edge of the pressure port is provided with a mounting edge 121 extending radially outward. The syringe 120 further includes a sealing cap 122 that is sleeved over the pressure push rod 320 and covers the mounting edge 121 to seal the pressure port, limit the pressure piston 310, and guide the pressure push rod 320. Specifically, the pressure piston extends into the syringe 120 from the pressure port, and then the sealing cap 122 is installed through the mounting edge 121 to increase the surface-to-surface sealing area, achieve reliable sealing of the pressure port, prevent leakage of the liquid medicine, limit the pressure piston 310 to prevent it from escaping from the syringe 120, and guide the pressure push rod 320 to ensure reliable movement of the pressure push rod 320.

[0034] As shown in FIG3 , in this embodiment, the edge of the sealing cover 122 is provided with a retaining portion 123 that wraps around the edge of the mounting edge 121 and is used to elastically retain the mounting edge 121. Specifically, the retaining portion 123 wraps around the edge of the mounting edge 121 to elastically retain the mounting edge 121, facilitating assembly and disassembly of the sealing cover 122 and improving assembly efficiency.

[0035] As shown in FIG3 , in this embodiment, a guide hole is formed in the middle of the sealing cap 122, which is threadedly connected to the pressure push rod 320 and allows the pressure push rod 320 to extend into the syringe 120 to rotate and move the pressure piston 310. Specifically, the guide hole is threadedly connected to the pressure push rod 320, so that the pressure push rod 320 can be extended and retracted by rotating the pressure push rod 320, thereby facilitating control of the extension amount of the pressure push rod 320 and achieving precise injection of the liquid medicine.

[0036] As shown in Figure 3, in this embodiment, the end of the pressure push rod 320 away from the pressure piston 310 is provided with a pressure handle 330 extending radially outward. Specifically, the pressure handle 330 facilitates the user to apply torque to the pressure push rod 320 to drive the pressure push rod 320 to rotate.

[0037] In this embodiment, a sealing ring is provided between the pressure piston 310 and the sealing cap 122. The sealing ring is mounted on the outside of the pressure push rod 320 and is in sealing contact with the inner wall of the syringe 120. Specifically, the sealing ring improves the sealing performance at the pressure-bearing end of the syringe 120, prevents leakage of the drug solution, and facilitates the long-term storage of the drug in the syringe 120.

[0038] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A prefilled syringe with an easy-to-break seal, characterized in that: include An injection assembly (100) is used to contain a drug solution and inject the drug solution under a preset pressure; An easily foldable cap (200) is connected to the injection end of the injection component (100) and is used for being integrally injection-molded with the injection end of the injection component (100) to seal the injection end of the injection component (100); An injection needle, used to be plugged into and matched with the injection end of the injection assembly (100) to inject liquid medicine after the foldable cap (200) is broken; The pressure-applying component (300) is plug-fittedly connected to the pressure-receiving end of the injection component (100) and is used to apply a preset pressure to the inner cavity of the injection component (100).

2. The foldable seal prefilled syringe according to claim 1, characterized in that: The foldable cap (200) comprises an foldable portion (210) connected to the injection end of the injection assembly (100) and a force-applying portion (220) connected to the foldable portion (210), wherein the volume of the force-applying portion (220) is greater than the volume of the foldable portion (210).

3. The foldable seal prefilled syringe according to claim 2, characterized in that: An output portion (110) arranged in a conical shape and fixedly connected to the easy-to-break portion (210) is provided on the injection end of the injection assembly (100), and the output portion (110) is provided with an output cavity arranged in a conical shape for outputting liquid medicine.

4. The foldable seal prefilled syringe according to claim 1, characterized in that: The injection assembly (100) comprises a syringe (120) for respectively containing a medicinal solution and a medicine, a separation piston (130) arranged in the syringe (120) for separating the inner cavity of the syringe (120) into a first accommodating cavity and a second accommodating cavity and moving in the inner cavity of the syringe (120) under the action of a preset pressure applied by the injection assembly (100), and a connecting groove (140) formed by protruding outward from the inner wall of the syringe (120) for accommodating the separation piston (130) to connect the first accommodating cavity and the second accommodating cavity after the pressure-applying assembly (300) applies a preset pressure to the separation piston (130).

5. The foldable seal prefilled syringe according to claim 4, characterized in that: The pressure-applying assembly (300) comprises a pressure-applying piston (310) extending from the pressure-receiving end of the syringe (120) into the syringe (120) and sealingly fitting with the inner wall of the syringe (120), and a pressure-applying push rod (320) connected to the pressure-applying piston (310) and extending outside the syringe (120).

6. The foldable seal prefilled syringe according to claim 5, characterized in that: The pressure-bearing end of the injection barrel (120) is provided with a pressure port for opening outward to allow the pressure piston (310) to extend into the injection barrel (120), and the edge of the pressure port is provided with a mounting edge (121) extending radially outward. The injection barrel (120) also includes a sealing cover (122) which is sleeved on the outside of the pressure push rod (320) and covers the mounting edge (121) and is used to seal the pressure port and limit the pressure piston (310) and guide the pressure push rod (320).

7. The foldable seal prefilled syringe according to claim 6, characterized in that: The edge of the sealing cover (122) is provided with a clamping portion (123) that wraps around the edge of the mounting edge (121) and is used to elastically clamp the mounting edge (121).

8. The foldable seal prefilled syringe according to claim 6, characterized in that: A guide hole threadedly connected to the pressure push rod (320) is provided in the middle of the sealing cover (122) and is used for the pressure push rod (320) to extend into the injection cylinder (120) to rotate and push the pressure piston (310) to move.

9. The foldable seal prefilled syringe according to claim 8, characterized in that: A pressure handle (330) extending radially outward is provided at the end of the pressure push rod (320) away from the pressure piston (310).

10. The prefilled syringe with a breakable seal according to claim 6, characterized in that: A sealing ring is provided between the pressure piston (310) and the sealing cover (122), which is sleeved on the outside of the pressure push rod (320) and is in sealing contact with the inner wall of the injection cylinder (120).

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