A preflush syringe piston

Abstract

The present application relates to the technical field of medical devices, in particular to a preflushing type syringe piston, comprising: a first piston, a second piston, a first sealing assembly is arranged on the first piston, a first cavity is arranged in the first piston, a first mounting port is arranged at the bottom of the first piston, the first mounting port is communicated with the first cavity, a second sealing assembly is arranged on the second piston, a second cavity is arranged in the second piston, a first opening and a second opening are arranged at the top and bottom of the second piston respectively, the first opening and the second opening are communicated with the second cavity, which shows obvious advantages in improving medical efficiency, ensuring patient safety, optimizing medical resource allocation and other aspects, and is an embodiment of the progress of modern medical technology. It not only improves the working environment of medical staff, but also improves the medical experience of patients, and has wide application prospect and far-reaching social significance.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a pre-filled syringe piston. Background Technology

[0002] In modern medical practice, precise and efficient drug delivery is a key factor in improving treatment outcomes, reducing side effects, and enhancing patient comfort. Particularly in the field of injectable drug delivery, traditional multi-step drug mixing methods have gradually revealed their limitations and shortcomings, especially in emergency treatment or clinical scenarios requiring rapid drug administration. Traditional methods typically involve using two separate syringes to draw different drugs, followed by manual mixing in an external container or merging via complex connecting devices (such as Y-connectors). This process is not only time-consuming and increases the workload for healthcare workers, but can also lead to inaccurate drug dosages and uneven mixing due to improper operation, thus affecting treatment efficacy or causing unnecessary risks. Furthermore, multiple punctures and drug transfers increase patient pain and the risk of cross-infection. With the development of medical technology, pre-filled syringes have been introduced to the market as an innovative solution, aiming to simplify drug preparation and improve drug delivery efficiency. These syringes typically contain pre-loaded drugs, achieving rapid drug release through simple mechanical action. However, early pre-filled syringe designs were primarily designed for the rapid administration of single drugs, proving inadequate for situations requiring on-site mixing of two or more drugs. Although there are some products on the market that attempt to solve this problem, such as syringes with compartmentalized designs, these solutions are often complex in structure, expensive, and still pose certain operational difficulties and safety hazards in actual use. Summary of the Invention

[0003] In view of this, the present invention addresses the shortcomings of the prior art by proposing a pre-filled syringe piston, which aims to solve at least one of the problems mentioned in the background art.

[0004] The present invention provides a pre-filled syringe piston, comprising: a first piston, a first sealing assembly disposed on the first piston, a first chamber disposed inside the first piston, and a first mounting port disposed at the bottom of the first piston, the first mounting port communicating with the first chamber;

[0005] The second piston is provided with a second sealing assembly and a second chamber is provided inside the second piston. The top and bottom of the second piston are respectively provided with a first opening and a second opening, and both the first opening and the second opening are in communication with the second chamber.

[0006] In some embodiments, the first sealing assembly includes:

[0007] A first sealing body is disposed on the top of the first piston, and the outer diameter of the first sealing body is larger than the outer diameter of the first piston;

[0008] The second sealing body is disposed in the middle of the first piston, and the outer diameter of the second sealing body is the same as the outer diameter of the first sealing body;

[0009] A third sealing body is disposed at the bottom of the first piston, and the outer diameter of the third sealing body is the same as that of the first sealing body.

[0010] In some embodiments, the first sealing body, the second sealing body, the third sealing body and the first piston are integral structures, a first groove is formed between the first sealing body and the second sealing body, and a second groove is formed between the second sealing body and the third sealing body.

[0011] In some embodiments, the first sealing body and the third sealing body have circular cross-sections, the height of the first sealing body is greater than the height of the third sealing body, the second sealing body coincides with the transverse axis of the first piston, and the axial cross-sections of the first sealing body, the second sealing body, and the third sealing body are all rectangular.

[0012] In some embodiments, the first chamber includes:

[0013] A first connecting chamber is disposed along the length direction of the first piston;

[0014] The second connecting chamber is located in the middle of the first piston, and the inner diameter of the second connecting chamber is larger than the inner diameter of the first connecting chamber.

[0015] In some embodiments, the second sealing assembly includes:

[0016] A first sealing block is disposed on the top of the second piston, and the outer diameter of the first sealing block is larger than the outer diameter of the second piston;

[0017] The second sealing block is disposed in the middle of the second piston, and the outer diameter of the second sealing block is the same as the outer diameter of the first sealing block;

[0018] A third sealing block is disposed at the bottom of the second piston, and the outer diameter of the third sealing block is the same as that of the first sealing block.

[0019] In some embodiments, the first sealing block, the second sealing block, the third sealing block and the second piston are an integral structure, a third groove is formed between the first sealing block and the second sealing block, and a fourth groove is formed between the second sealing block and the third sealing block.

[0020] In some embodiments, the second sealing block coincides with the transverse axis of the second piston, the axial cross-section of the second sealing block and the third sealing block is rectangular, the axial cross-section of the upper part of the first sealing block is trapezoidal, and the axial cross-section of the lower part of the first sealing block is rectangular.

[0021] In some embodiments, the chamfer angle of the top of the first sealing block is 20°.

[0022] In some embodiments, the second chamber includes:

[0023] A first fixed chamber is disposed at the top of the second piston. The inner diameter of the first fixed chamber is larger than the inner diameter of the first opening. The first fixed chamber is used to place the drug capsule.

[0024] The second fixed chamber is located at the bottom of the second piston and at the bottom of the first fixed chamber. The inner diameter of the second fixed chamber is larger than that of the first fixed chamber. The inner diameter of the second fixed chamber is larger than that of the second opening. The inner diameter of the second opening is larger than that of the first fixed chamber. The first opening, the first fixed chamber, the second fixed chamber, and the second opening are interconnected.

[0025] Compared with existing technologies, the advantages of this invention are as follows: The pre-filled syringe piston design, through a built-in dual-piston system—one for propelling the medication and the other for a built-in drug capsule—allows users to complete drug mixing and injection with a simple push-pull motion. This design greatly simplifies the traditional multi-step drug mixing process, reducing the workload of medical staff and allowing them to focus more on patient care. This design enables rapid drug preparation, improving treatment efficiency, and is particularly suitable for environments requiring rapid drug administration, such as emergency rooms and operating rooms. The rapid drug mixing and injection capability significantly shortens waiting time, enabling patients to receive timely treatment, thereby improving survival rates and treatment outcomes. The internally pre-filled drug capsule ensures accurate drug dosage, avoiding errors that may occur during manual measurement and transfer, thus improving the safety and effectiveness of treatment. Since the entire drug mixing process is completed within a closed syringe, the possibility of external environmental contamination of the drug is effectively reduced, while also lowering the risk of medical staff coming into contact with harmful substances. Reducing drug transfer steps means reducing the number of needle changes and the time exposed to air, thereby reducing the risk of cross-infection. The simplified procedure not only improves medical efficiency but also shortens patients' waiting time and reduces discomfort caused by multiple punctures.

[0026] The above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0027] Other features and aspects of this disclosure will become clearer from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 A first piston isometric view of the pre-filled syringe piston provided in an embodiment of the present invention;

[0030] Figure 2 This is a front cross-sectional view of the first piston structure of the pre-filled syringe piston provided in an embodiment of the present invention;

[0031] Figure 3 A canometric view of the second piston of the pre-filled syringe piston provided in an embodiment of the present invention;

[0032] Figure 4 This is a front cross-sectional view of the second piston of the pre-filled syringe piston provided in an embodiment of the present invention.

[0033] Wherein: 1. First piston; 2. First mounting port; 3. Second piston; 4. First opening; 5. Second opening; 6. First sealing body; 7. Second sealing body; 8. Third sealing body; 9. First groove; 10. Second groove; 11. First connecting chamber; 12. Second connecting chamber; 13. First sealing block; 14. Second sealing block; 15. Third sealing block; 16. Third groove; 17. Fourth groove; 18. First fixed chamber; 19. Second fixed chamber. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] As mentioned in the background section, in modern medical practice, precise and efficient drug delivery is one of the key factors in improving treatment efficacy, reducing side effects, and enhancing patient comfort. Especially in the field of injectable drug delivery, traditional multi-step drug mixing methods have gradually revealed their limitations and shortcomings, particularly in emergency treatment or clinical scenarios requiring rapid drug administration. Traditional methods typically involve using two separate syringes to draw different drugs, followed by manual mixing in an external container or merging the drugs using complex connecting devices (such as Y-connectors). This process is not only time-consuming and increases the workload of medical staff, but may also lead to inaccurate drug dosages and uneven mixing due to improper operation, thereby affecting treatment efficacy or causing unnecessary risks. Furthermore, multiple punctures and drug transfers increase patient pain and the risk of cross-infection. With the development of medical technology, pre-filled syringes have been introduced to the market as an innovative solution, aiming to simplify drug preparation processes and improve drug delivery efficiency. These syringes typically contain pre-loaded drugs, achieving rapid drug release through simple mechanical action. However, early pre-filled syringe designs were primarily designed for the rapid administration of single drugs, proving inadequate for situations requiring on-site mixing of two or more drugs. Although there are some products on the market that attempt to solve this problem, such as syringes with compartmentalized designs, these solutions are often complex in structure, expensive, and still pose certain operational difficulties and safety hazards in actual use.

[0039] To address the aforementioned issues, this application proposes a pre-filled syringe piston. This pre-filled syringe piston design utilizes a built-in dual-piston system: one piston propels the medication, while the other houses the medication capsule. Users can complete drug mixing and injection with a simple push-pull motion. This design significantly simplifies the traditional multi-step drug mixing process, reducing the workload for medical staff and allowing them to focus more on patient care. This design enables rapid drug preparation, improving treatment efficiency, and is particularly suitable for environments requiring rapid drug administration, such as emergency rooms and operating rooms. The rapid drug mixing and injection capability significantly reduces waiting time, enabling patients to receive timely treatment, thereby improving survival rates and treatment outcomes. The internally pre-filled medication capsule ensures accurate drug dosage, avoiding errors that may occur during manual measurement and transfer, thus improving treatment safety and effectiveness. Since the entire drug mixing process is completed within a closed syringe, the possibility of external environmental contamination of the drug is effectively reduced, as is the risk of medical staff coming into contact with harmful substances. Reducing drug transfer steps means reducing the number of needle changes and exposure time to air, thereby reducing the risk of cross-infection. The simplified procedure not only improves medical efficiency but also shortens patients' waiting time and reduces discomfort caused by multiple punctures.

[0040] See Figure 1-4 As shown, a pre-charge syringe piston according to an embodiment of this application includes:

[0041] A first piston 1 is provided with a first sealing assembly, a first chamber is provided inside the first piston 1, and a first mounting port 2 is provided at the bottom of the first piston 1, which communicates with the first chamber.

[0042] It should be understood that the bottom of the syringe plunger extends into the interior of the first piston 1 through the first mounting port 2 and engages with the first piston 1.

[0043] The second piston 3 is provided with a second sealing assembly and a second chamber is provided inside the second piston 3. The top and bottom of the second piston 3 are respectively provided with a first opening 4 and a second opening 5, and both the first opening 4 and the second opening 5 are in communication with the second chamber.

[0044] In some specific embodiments, the first sealing assembly includes:

[0045] The first sealing body 6 is disposed on the top of the first piston 1, and the outer diameter of the first sealing body 6 is larger than the outer diameter of the first piston 1.

[0046] The second sealing body 7 is disposed in the middle of the first piston 1, and the outer diameter of the second sealing body 7 is the same as the outer diameter of the first sealing body 6.

[0047] The third sealing body 8 is located at the bottom of the first piston 1, and the outer diameter of the third sealing body 8 is the same as the outer diameter of the first sealing body 6.

[0048] In some specific embodiments, the first sealing body 6, the second sealing body 7, the third sealing body 8 and the first piston 1 are integral structures, a first groove 9 is formed between the first sealing body 6 and the second sealing body 7, and a second groove 10 is formed between the second sealing body 7 and the third sealing body 8.

[0049] In some specific embodiments, the first sealing body 6 and the third sealing body 8 have circular cross-sections, the height of the first sealing body 6 is greater than the height of the third sealing body 8, the second sealing body 7 coincides with the transverse axis of the first piston 1, and the axial cross-sections of the first sealing body 6, the second sealing body 7, and the third sealing body 8 are all rectangular.

[0050] It should be understood that, because the outer diameter of the first sealing body 6 is larger than that of the first piston 1, it can form an effective seal inside the syringe, preventing leakage of the medication. This design ensures good sealing performance even under high pressure. The larger outer diameter increases the structural strength of the first sealing body 6, making it less prone to deformation or damage under external forces. This is especially important for syringes used for extended periods or multiple uses. The second sealing body 7 works in conjunction with the first sealing body 6 to further enhance the sealing performance of the entire system. This dual sealing mechanism greatly improves the safety of the syringe. As an auxiliary sealing element, the second sealing body 7 helps ensure a good seal even if the first sealing body 6 is damaged. This is crucial for improving the safety and reliability of the syringe. The third sealing body 8, located at the bottom, ensures the seal at the bottom of the syringe, preventing leakage of the medication from the bottom. This is crucial for maintaining the effectiveness of the medication. Due to its location near the bottom, the third sealing body 8 typically withstands less direct pressure, thus improving its durability. The grooves can accommodate small impurities or particles, preventing them from entering the sealing area and affecting the sealing effect. This is very important for maintaining the cleanliness of the syringe. The groove design allows the sealing component some room for deformation when subjected to external forces, improving overall flexibility. This is crucial for adapting to syringes of different shapes and sizes.

[0051] In some specific embodiments, the first chamber includes:

[0052] The first connecting chamber 11 is arranged along the length direction of the first piston 1;

[0053] The second connecting chamber 12 is located in the middle of the first piston 1, and the inner diameter of the second connecting chamber 12 is larger than the inner diameter of the first connecting chamber 11.

[0054] It should be understood that the snap-fit ​​end of the syringe plunger is embedded in the second connecting chamber 12, making the plunger more tightly engaged with the first piston 1 and less likely to fall off.

[0055] In some specific embodiments, the second sealing assembly includes:

[0056] The first sealing block 13 is disposed on the top of the second piston 3, and the outer diameter of the first sealing block 13 is larger than the outer diameter of the second piston 3.

[0057] The second sealing block 14 is disposed in the middle of the second piston 3, and the outer diameter of the second sealing block 14 is the same as the outer diameter of the first sealing block 13.

[0058] The third sealing block 15 is located at the bottom of the second piston 3, and the outer diameter of the third sealing block 15 is the same as the outer diameter of the first sealing block 13.

[0059] It should be understood that the second sealing assembly has the same function as the first sealing assembly.

[0060] In some specific embodiments, the first sealing block 13, the second sealing block 14, the third sealing block 15 and the second piston 3 are integral structures, a third groove 16 is formed between the first sealing block 13 and the second sealing block 14, and a fourth groove 17 is formed between the second sealing block 14 and the third sealing block 15.

[0061] It should be understood that the third groove 16 and the fourth groove 17 have the same function as the first groove 9 and the second groove 10.

[0062] In some specific embodiments, the second sealing block 14 coincides with the transverse axis of the second piston 3, the axial cross-section of the second sealing block 14 and the third sealing block 15 is a rectangular structure, the axial cross-section of the upper part of the first sealing block 6 is a trapezoidal structure, and the axial cross-section of the lower part of the first sealing block 6 is a rectangular structure.

[0063] It should be understood that the axial cross-section of the upper part of the first sealing block 6 is a trapezoidal structure, which can better abut and fit against the bottom wall inside the syringe, preventing drug residue inside the syringe.

[0064] In some specific embodiments, the chamfer angle of the top of the first sealing block 13 is 20°.

[0065] In some specific embodiments, the second chamber includes:

[0066] The first fixed chamber 18 is located at the top of the second piston 3. The inner diameter of the first fixed chamber 18 is larger than the inner diameter of the first opening 4. The first fixed chamber 18 is used to place the medicine bag.

[0067] The second fixed chamber 19 is located at the bottom of the second piston 3. The second fixed chamber 19 is located at the bottom of the first fixed chamber 18. The inner diameter of the second fixed chamber 19 is larger than the inner diameter of the first fixed chamber 18. The inner diameter of the second fixed chamber 19 is larger than the inner diameter of the second opening 5. The inner diameter of the second opening 5 is larger than the inner diameter of the first fixed chamber 18. The first opening 4, the first fixed chamber 18, the second fixed chamber 19, and the second opening 5 are interconnected.

[0068] It should be understood that the second fixed chamber 19 is used to engage with the connection part of the propulsion cylinder, so that the second piston and the propulsion cylinder are more tightly and securely connected.

[0069] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A pre-filled syringe piston, characterized in that, include: A first piston, a first sealing assembly is provided on the first piston, a first chamber is provided inside the first piston, and a first mounting port is provided at the bottom of the first piston, the first mounting port communicating with the first chamber; The second piston is provided with a second sealing assembly and a second chamber is provided inside the second piston. The top and bottom of the second piston are respectively provided with a first opening and a second opening, and both the first opening and the second opening are in communication with the second chamber.

2. The pre-filled syringe piston according to claim 1, characterized in that, The first sealing assembly includes: A first sealing body is disposed on the top of the first piston, and the outer diameter of the first sealing body is larger than the outer diameter of the first piston; The second sealing body is disposed in the middle of the first piston, and the outer diameter of the second sealing body is the same as the outer diameter of the first sealing body; A third sealing body is disposed at the bottom of the first piston, and the outer diameter of the third sealing body is the same as that of the first sealing body.

3. The pre-charge syringe piston according to claim 2, characterized in that, The first sealing body, the second sealing body, the third sealing body and the first piston are integral structures. A first groove is formed between the first sealing body and the second sealing body, and a second groove is formed between the second sealing body and the third sealing body.

4. A pre-filled syringe piston according to claim 2, characterized in that, The first sealing body and the third sealing body have circular cross-sections. The height of the first sealing body is greater than that of the third sealing body. The second sealing body coincides with the transverse axis of the first piston. The axial cross-sections of the first sealing body, the second sealing body, and the third sealing body are all rectangular.

5. A pre-filled syringe piston according to claim 2, characterized in that, The first chamber includes: A first connecting chamber is disposed along the length direction of the first piston; The second connecting chamber is located in the middle of the first piston, and the inner diameter of the second connecting chamber is larger than the inner diameter of the first connecting chamber.

6. A pre-filled syringe piston according to claim 1, characterized in that, The second sealing assembly includes: A first sealing block is disposed on the top of the second piston, and the outer diameter of the first sealing block is larger than the outer diameter of the second piston; The second sealing block is disposed in the middle of the second piston, and the outer diameter of the second sealing block is the same as the outer diameter of the first sealing block; A third sealing block is disposed at the bottom of the second piston, and the outer diameter of the third sealing block is the same as that of the first sealing block.

7. A pre-charge syringe piston according to claim 6, characterized in that, The first sealing block, the second sealing block, the third sealing block and the second piston are integral structures. A third groove is formed between the first sealing block and the second sealing block, and a fourth groove is formed between the second sealing block and the third sealing block.

8. A pre-charge syringe piston according to claim 7, characterized in that, The second sealing block coincides with the transverse axis of the second piston. The axial cross-section of the second sealing block and the third sealing block is rectangular. The axial cross-section of the upper part of the first sealing block is trapezoidal. The axial cross-section of the lower part of the first sealing block is rectangular.

9. A pre-charge syringe piston according to claim 8, characterized in that, The chamfer angle at the top of the first sealing block is 20°.

10. A pre-charge syringe piston according to claim 8, characterized in that, The second chamber includes: A first fixed chamber is disposed at the top of the second piston. The inner diameter of the first fixed chamber is larger than the inner diameter of the first opening. The first fixed chamber is used to place the drug capsule. The second fixed chamber is located at the bottom of the second piston and at the bottom of the first fixed chamber. The inner diameter of the second fixed chamber is larger than that of the first fixed chamber. The inner diameter of the second fixed chamber is larger than that of the second opening. The inner diameter of the second opening is larger than that of the first fixed chamber. The first opening, the first fixed chamber, the second fixed chamber, and the second opening are interconnected.

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