A progressive syringe
Patent Information
- Application Number
- CN202510008564.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2026-10-13
AI Technical Summary
然而，早期的预冲式注射器设计主要针对单一药物的快速给药需求，对于需要现场混合两种或多种药物的情况则显得力不从心
[0021]与现有技术相比，本发明的有益效果在于：通过第一推进组件和第二推进组件的设置，两种药物可以在同一个针筒内快速混合。这种设计避免了传统方法中需要使用两种注射器互相兑药的繁琐过程，大大节约了医护人员的操作时间，提高了工作效率。针筒内的底部设置有固定体，固定体的外径与针筒的内径相匹配，确保了药物在注射过程中的稳定性。刺针贯穿固定体并向下延伸至针筒底部出液端，刺针内设置有连通腔，使得药物能够均匀混合并通过刺针注入患者体内，避免了药物剂量的误差。第一推进组件包括第一橡胶活塞，其外径与针筒的内径相匹配，并且与针筒内壁密封滑动连接，有效防止药物在注射过程中的泄漏。第二推进组件中的第二橡胶活塞同样与推进筒内壁密封滑动连接，进一步确保了药物不会在操作过程中泄漏。针筒顶部设置有按压板，按压板以针筒为轴对称设置有两个，且两个按压板均与针筒顶部固定连接，使得操作更加方便快捷。第一推进组件的顶部设置有限位头，限位头的外径大于推进筒的外径，便于用户握持和操作。第二推进组件的推杆顶部设置有挤压板，挤压板的底部与推杆顶部固定连接，挤压板的外径大于推杆的外径，便于用户施加压力进行药物推进。整个注射器的结构设计紧凑，各部件之间配合紧密，便于携带和使用。无论是在医院、诊所还是家庭护理中，都能够方便地进行药物注射操作。
Smart Images
Figure CN122894598A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, and more specifically, to a progressive syringe. 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 progressive syringe, which aims to solve at least one of the problems mentioned in the background art.
[0004] The present invention provides a progressive syringe, comprising: a syringe barrel, a needle tip disposed at the bottom of the syringe barrel, a connecting end at the top of the needle tip being engaged with a liquid outlet end at the bottom of the syringe barrel, a penetrating component disposed on the inner wall of the liquid outlet end at the bottom of the syringe barrel, the side wall of the penetrating component being fixedly connected to the inner wall of the bottom of the syringe barrel, and a first opening disposed at the top of the syringe barrel.
[0005] A first propulsion assembly extends into the syringe through a first opening at the top of the syringe. The sidewall of the first propulsion assembly is connected to the inner wall of the syringe. A second opening is provided at the top of the first propulsion assembly.
[0006] The second propulsion component extends into the interior of the first propulsion component through a second opening provided at the top of the first propulsion component, and the sidewall of the second propulsion component is connected to the inner wall of the first propulsion component.
[0007] In some embodiments, a fixing body is provided at the bottom of the syringe, the outer diameter of the fixing body matches the inner diameter of the syringe, the fixing body and the syringe are integral structures, and a pressing plate is provided at the top of the syringe. Two pressing plates are symmetrically arranged about the syringe axis, and both pressing plates are fixedly connected to the top of the syringe.
[0008] In some embodiments, the penetrating component is a needle, the bottom of which extends downward through the fixing body to the liquid outlet end of the bottom of the syringe. The bottom of the needle and the liquid outlet end of the bottom of the syringe are on the same horizontal line. A communicating cavity is provided inside the needle. The sidewalls of the needle are fixedly connected to the fixing body and the inner wall of the bottom of the syringe, respectively. The top of the needle extends upward into the interior of the syringe. The needle coincides with the axis of the syringe. The top of the needle is higher than the fixing body. The top of the needle has an inclined elliptical needle mouth shape.
[0009] In some embodiments, the first propulsion component includes:
[0010] A propulsion cylinder, wherein the top of the propulsion cylinder is provided with a second opening and the bottom of the propulsion cylinder is provided with a second propulsion port;
[0011] A first rubber piston is detachably connected to the bottom of the push cylinder, and the outer diameter of the first rubber piston matches the inner diameter of the syringe.
[0012] The propulsion cylinder and the first rubber piston extend into the interior of the syringe through the first opening at the top of the syringe, and the side wall of the first rubber piston is slidably connected to the inner wall of the syringe in a sealed manner.
[0013] In some embodiments, a limiting head is provided at the top of the propulsion cylinder, the limiting head and the propulsion cylinder are integral structures, and the outer diameter of the limiting head is larger than the outer diameter of the propulsion cylinder; a first connecting head is provided at the bottom of the propulsion cylinder, the outer diameter of the first connecting head is smaller than the outer diameter of the propulsion cylinder, and the first connecting head is detachably connected to the first rubber piston.
[0014] In some embodiments, a through hole is provided at the center of the first rubber piston, which extends through the entire first rubber piston. The through hole is used to place a drug capsule, and the through hole communicates with the interior of the first connector and the propulsion cylinder.
[0015] In some embodiments, a vent hole is provided on the bottom of the side wall of the propulsion cylinder.
[0016] In some embodiments, the second propulsion component includes:
[0017] A push rod, wherein a support body is provided on the side wall of the push rod;
[0018] The second rubber piston is disposed at the bottom of the push rod and is detachably connected to the bottom of the push rod. The outer diameter of the second rubber piston matches the inner diameter of the propulsion cylinder. The push rod and the second rubber piston extend into the interior of the propulsion cylinder through the limiting head at the top of the propulsion cylinder. The side wall of the second rubber piston is slidably connected to the inner wall of the propulsion cylinder in a sealing manner. The side of the support body away from the push rod is slidably connected to the inner wall of the propulsion cylinder.
[0019] In some embodiments, the axial cross-section of the support is a right-angled trapezoidal structure, and multiple supports are arranged in a ring array with the push rod as the axis.
[0020] In some embodiments, a compression plate is provided at the top of the push rod, the bottom of the compression plate is fixedly connected to the top of the push rod, the compression plate coincides with the axis of the push rod, the outer diameter of the compression plate is larger than the outer diameter of the push rod, and the outer diameter of the compression plate is larger than the outer diameter of the limiting head; a second connector is provided at the bottom of the push rod, the outer diameter of the second connector is smaller than the outer diameter of the push rod, and the second connector is detachably connected to the second rubber piston.
[0021] Compared with existing technologies, the advantages of this invention are as follows: Through the arrangement of the first and second propulsion components, two drugs can be rapidly mixed within the same syringe. This design avoids the cumbersome process of using two syringes to mix drugs in traditional methods, greatly saving medical personnel's operation time and improving work efficiency. A fixing body is provided at the bottom of the syringe, with its outer diameter matching the inner diameter of the syringe, ensuring the stability of the drug during injection. The needle penetrates the fixing body and extends downwards to the liquid outlet at the bottom of the syringe. A communicating cavity is provided inside the needle, allowing the drugs to be uniformly mixed and injected into the patient through the needle, avoiding errors in drug dosage. The first propulsion component includes a first rubber piston, whose outer diameter matches the inner diameter of the syringe and is slidably and sealed to the inner wall of the syringe, effectively preventing drug leakage during injection. The second rubber piston in the second propulsion component is also slidably and sealed to the inner wall of the propulsion cylinder, further ensuring that the drug will not leak during operation. A pressing plate is provided at the top of the syringe, with two pressing plates symmetrically arranged around the syringe axis, and both pressing plates are fixedly connected to the top of the syringe, making operation more convenient and faster. The first propulsion assembly features a limiting head at its top, with an outer diameter larger than the outer diameter of the propulsion cylinder for easy grip and operation. The second propulsion assembly has a squeezing plate at the top of the push rod, its bottom fixedly connected to the top of the push rod. The squeezing plate's outer diameter is larger than the push rod's outer diameter, facilitating pressure application for drug delivery. The entire syringe boasts a compact design with tightly fitting components, making it easy to carry and use. It allows for convenient drug injection in hospitals, clinics, and home care settings.
[0022] The above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.
[0023] 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
[0024] 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.
[0025] Figure 1 An exploded view of a progressive syringe provided in an embodiment of the present invention;
[0026] Figure 2 An isometric view of the propulsion barrel of a progressive syringe provided in an embodiment of the present invention;
[0027] Figure 3 This is a front sectional view of the progressive syringe propulsion tube provided in an embodiment of the present invention;
[0028] Figure 4 A isometric view of the push rod of a progressive syringe provided in an embodiment of the present invention;
[0029] Figure 5 An isometric view of a progressive syringe barrel provided in an embodiment of the present invention;
[0030] Figure 6 This is a front cross-sectional view of the progressive syringe barrel provided in an embodiment of the present invention;
[0031] Figure 7 This is a front cross-sectional view of the progressive syringe needle provided in an embodiment of the present invention;
[0032] Figure 8 This is an isometric view of the needle of a progressive syringe provided in an embodiment of the present invention.
[0033] The components are: 1. Syringe; 2. Needle; 3. First opening; 4. Second opening; 5. Fixing body; 6. Pressing plate; 7. Needle; 8. Connecting cavity; 9. Propulsion cylinder; 10. Second propulsion port; 11. First rubber piston; 12. Limiting head; 13. First connecting head; 14. Through hole; 15. Drug capsule; 16. Vent hole; 17. Push rod; 18. Support body; 19. Second rubber piston; 20. Squeezing plate; 21. Second connecting head. 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 progressive syringe that, through the arrangement of a first and a second propulsion assembly, allows for the rapid mixing of two medications within the same syringe. This design eliminates the cumbersome process of using two separate syringes for drug mixing, significantly saving medical personnel's time and improving work efficiency. A fixing body is located at the bottom of the syringe, with its outer diameter matching the syringe's inner diameter to ensure drug stability during injection. The needle penetrates the fixing body and extends downwards to the liquid outlet at the bottom of the syringe. A communicating cavity is provided within the needle, allowing for uniform mixing of the medication and its injection into the patient, avoiding dosage errors. The first propulsion assembly includes a first rubber piston, whose outer diameter matches the syringe's inner diameter and is slidably and sealingly connected to the syringe's inner wall, effectively preventing drug leakage during injection. Similarly, the second rubber piston in the second propulsion assembly is slidably and sealingly connected to the inner wall of the propulsion cylinder, further ensuring no drug leakage during operation. The syringe features two symmetrically arranged pressure plates on its top, symmetrically positioned around the syringe axis, both fixedly connected to the top for enhanced ease of operation. The first injection assembly has a limiting head at its top, with an outer diameter larger than the injection barrel's outer diameter for comfortable grip and operation. The second injection assembly has a squeezing plate at its top push rod, its bottom fixedly connected to the top of the push rod. The squeezing plate's outer diameter is larger than the push rod's outer diameter, facilitating pressure application for drug delivery. The entire syringe boasts a compact design with tightly fitting components, making it easy to carry and use. It allows for convenient drug injection in hospitals, clinics, and home care settings.
[0040] See Figure 1-8 As shown, a progressive syringe according to an embodiment of this application includes:
[0041] Syringe 1, needle 2 is provided at the bottom of syringe 1, the connecting end of the top of needle 2 is engaged with the liquid outlet end at the bottom of syringe 1, a penetrating component is provided on the inner wall of the liquid outlet end at the bottom of syringe 1, the side wall of the penetrating component is fixedly connected to the inner wall at the bottom of syringe 1, and a first opening 3 is provided at the top of syringe 1.
[0042] The first propulsion component extends into the syringe 1 through the first opening 3 at the top of the syringe 1. The side wall of the first propulsion component is connected to the inner wall of the syringe 1. The top of the first propulsion component is provided with a second opening 4.
[0043] The second propulsion component extends into the interior of the first propulsion component through a second opening 4 provided at the top of the first propulsion component, and the side wall of the second propulsion component is connected to the inner wall of the first propulsion component.
[0044] In some specific embodiments, a fixing body 5 is provided at the bottom of the syringe 1. The outer diameter of the fixing body 5 matches the inner diameter of the syringe 1. The fixing body 5 and the syringe 1 are integral structures. A pressing plate 6 is provided at the top of the syringe 1. Two pressing plates 6 are symmetrically arranged about the syringe 1 as an axis, and both pressing plates 6 are fixedly connected to the top of the syringe 1.
[0045] In some specific embodiments, the penetrating component is a needle 7. The bottom of the needle 7 penetrates the fixing body 5 and extends downward to the liquid outlet end of the bottom of the syringe 1. The bottom of the needle 7 and the liquid outlet end of the bottom of the syringe 1 are on the same horizontal line. A communicating cavity 8 is provided inside the needle 7. The side walls of the needle 7 are fixedly connected to the fixing body 5 and the inner wall of the bottom of the syringe 1, respectively. The top of the needle 7 extends upward into the interior of the syringe 1. The center line of the needle 7 coincides with that of the syringe 1. The top of the needle 7 is higher than the fixing body 5. The top of the needle 7 is an inclined elliptical needle mouth shape.
[0046] In some specific embodiments, the first propulsion component includes:
[0047] The propulsion cylinder 9 has a second opening 4 at its top and a second propulsion port 10 at its bottom.
[0048] The first rubber piston 11 is detachably connected to the bottom of the push cylinder 9, and the outer diameter of the first rubber piston 11 matches the inner diameter of the syringe 1.
[0049] The push tube 9 and the first rubber piston 11 extend into the interior of the syringe 1 through the first opening 3 at the top of the syringe 1, and the side wall of the first rubber piston 11 is in a sealed sliding connection with the inner wall of the syringe 1.
[0050] In some specific embodiments, a limiting head 12 is provided at the top of the propulsion cylinder 9. The limiting head 12 and the propulsion cylinder 9 are integral structures, and the outer diameter of the limiting head 12 is larger than the outer diameter of the propulsion cylinder 9. A first connecting head 13 is provided at the bottom of the propulsion cylinder 9. The outer diameter of the first connecting head 13 is smaller than the outer diameter of the propulsion cylinder 9, and the first connecting head 13 is detachably connected to the first rubber piston 11.
[0051] In some specific embodiments, a through hole 14 is provided at the center of the first rubber piston 11, which runs through the entire first rubber piston 11. The through hole 14 is used to place the drug capsule 15. The through hole 14 is connected to the interior of the first connector 13 and the push cylinder 9.
[0052] In some specific embodiments, a vent hole 16 is provided on the bottom of the side wall of the propulsion cylinder 9.
[0053] It should be understood that when the push rod 17 slides downward, the gas inside the push tube 9 flows out through the vent 16. When the push rod 17 moves below the vent 16, the second rubber piston seals the push rod 17, which will carry the push tube 9 along until the push tube 9 moves to the bottom of the syringe 1.
[0054] In some specific embodiments, the second propulsion component includes:
[0055] Push rod 17, with a support body 18 provided on the side wall of push rod 17;
[0056] The second rubber piston 19 is disposed at the bottom of the push rod 17 and is detachably connected to the bottom of the push rod 17. The outer diameter of the second rubber piston 19 matches the inner diameter of the push cylinder 9. The push rod 17 and the second rubber piston 19 extend into the interior of the push cylinder 9 through the limiting head 12 at the top of the push cylinder 9. The side wall of the second rubber piston 19 is slidably connected to the inner wall of the push cylinder 9. The side of the support body 18 away from the push rod 17 is slidably connected to the inner wall of the push cylinder 9.
[0057] In some specific embodiments, the axial cross section of the support body 18 is a right-angled trapezoidal structure, and multiple support bodies 18 are arranged in a ring array with the push rod 17 as the axis.
[0058] In some specific embodiments, a pressing plate 20 is provided at the top of the push rod 17, and the bottom of the pressing plate 20 is fixedly connected to the top of the push rod 17. The axis of the pressing plate 20 coincides with that of the push rod 17, and the outer diameter of the pressing plate 20 is larger than that of the push rod 17. The outer diameter of the pressing plate 20 is also larger than that of the limiting head 12. A second connecting head 21 is provided at the bottom of the push rod 17. The outer diameter of the second connecting head 21 is smaller than that of the push rod 17, and the second connecting head 21 is detachably connected to the second rubber piston 19.
[0059] It should be understood that when the push tube 9 slides to the bottom wall inside the syringe 1, the needle 7 extends into the inside of the first rubber piston 11, and after the needle 7 punctures the drug capsule 15 inside the first rubber piston 11, the drug liquid inside the drug capsule 15 flows into the bottom of the syringe 1, and then the push rod is pulled to draw another drug liquid through the needle 2, so that the two drug liquids are mixed.
[0060] 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 progressive syringe, characterized in that, include: A syringe, wherein a needle is provided at the bottom of the syringe, the connecting end of the top of the needle is engaged with the liquid outlet end at the bottom of the syringe, a penetrating component is provided on the inner wall of the liquid outlet end at the bottom of the syringe, the side wall of the penetrating component is fixedly connected to the inner wall of the bottom of the syringe, and a first opening is provided at the top of the syringe. A first propulsion assembly extends into the syringe through a first opening at the top of the syringe. The sidewall of the first propulsion assembly is connected to the inner wall of the syringe. A second opening is provided at the top of the first propulsion assembly. The second propulsion component extends into the interior of the first propulsion component through a second opening provided at the top of the first propulsion component, and the sidewall of the second propulsion component is connected to the inner wall of the first propulsion component.
2. The progressive syringe according to claim 1, characterized in that, A fixing body is provided at the bottom of the syringe, the outer diameter of which matches the inner diameter of the syringe. The fixing body and the syringe are integral structures. A pressing plate is provided at the top of the syringe. Two pressing plates are arranged symmetrically about the syringe axis, and both pressing plates are fixedly connected to the top of the syringe.
3. A progressive syringe according to claim 2, characterized in that, The penetrating component is a needle. The bottom of the needle penetrates the fixed body and extends downward to the liquid outlet end of the bottom of the syringe. The bottom of the needle and the liquid outlet end of the bottom of the syringe are on the same horizontal line. A communicating cavity is provided inside the needle. The sidewalls of the needle are fixedly connected to the fixed body and the inner wall of the bottom of the syringe, respectively. The top of the needle extends upward into the interior of the syringe. The needle coincides with the axis of the syringe. The top of the needle is higher than the fixed body. The top of the needle has an inclined elliptical needle mouth shape.
4. A progressive syringe according to claim 1, characterized in that, The first propulsion component includes: The propulsion cylinder has a second opening at its top and a second propulsion port at its bottom; A first rubber piston is detachably connected to the bottom of the push cylinder, and the outer diameter of the first rubber piston matches the inner diameter of the syringe. The propulsion cylinder and the first rubber piston extend into the interior of the syringe through the first opening at the top of the syringe, and the side wall of the first rubber piston is in a sealed sliding connection with the inner wall of the syringe.
5. A progressive syringe according to claim 4, characterized in that, The top of the propulsion cylinder is provided with a limiting head, which is an integral structure with the propulsion cylinder. The outer diameter of the limiting head is larger than the outer diameter of the propulsion cylinder. The bottom of the propulsion cylinder is provided with a first connecting head, which has an outer diameter smaller than the outer diameter of the propulsion cylinder. The first connecting head is detachably connected to the first rubber piston.
6. A progressive syringe according to claim 5, characterized in that, The first rubber piston has a through hole at its center that extends through the entire piston. The through hole is used to place a drug capsule. The through hole is connected to the interior of the first connector and the propulsion cylinder.
7. A progressive syringe according to claim 4, characterized in that, Ventilation holes are provided on the bottom of the side wall of the propulsion cylinder.
8. A progressive syringe according to claim 5, characterized in that, The second propulsion component includes: A push rod, wherein a support body is provided on the side wall of the push rod; The second rubber piston is disposed at the bottom of the push rod and is detachably connected to the bottom of the push rod. The outer diameter of the second rubber piston matches the inner diameter of the propulsion cylinder. The push rod and the second rubber piston extend into the interior of the propulsion cylinder through the limiting head at the top of the propulsion cylinder. The side wall of the second rubber piston is slidably connected to the inner wall of the propulsion cylinder in a sealing manner. The side of the support body away from the push rod is slidably connected to the inner wall of the propulsion cylinder.
9. A progressive syringe according to claim 8, characterized in that, The axial cross-section of the support body is a right-angled trapezoidal structure, and multiple supports are arranged in a ring array with the push rod as the axis.
10. A progressive syringe according to claim 8, characterized in that, The top of the push rod is provided with a compression plate, the bottom of the compression plate is fixedly connected to the top of the push rod, the compression plate coincides with the axis of the push rod, the outer diameter of the compression plate is larger than the outer diameter of the push rod, and the outer diameter of the compression plate is larger than the outer diameter of the limiting head; the bottom of the push rod is provided with a second connector, the outer diameter of the second connector is smaller than the outer diameter of the push rod, and the second connector is detachably connected to the second rubber piston.