Driving assembly and repeated injection pen

Abstract

The invention provides a driving assembly and a repeated injection pen. The driving assembly comprises a cylindrical fixing plug, a disc-shaped sealing gasket arranged in the fixing plug, a cylindrical push rod driver and a first push rod. A water outlet hole is formed in the side wall of the fixing plug; a first drainage hole is formed in the first end face of the sealing gasket, and a second drainage hole communicated with the first drainage hole and the water outlet hole is formed in the side wall of the sealing gasket; the push rod driver is clamped with the sealing gasket; one end of the first push rod penetrates through the sealing gasket and is in driving connection with the push rod. The repeated injection pen comprises a shell, a push rod rotating cylinder, a transmission mechanism, a tail handle, a second push rod and the driving assembly. According to the repeated injection pen, when liquid medicine leaks from the medicine chamber, the liquid medicine can be discharged to the outside of the repeated injection pen through the first drainage hole, the second drainage hole and the water outlet hole; the liquid medicine can be prevented from entering the driving assembly and the internal structure of the repeated injection pen, and the durability and reliability of the driving assembly and the repeated injection pen are improved.

Description

Technical Field

[0001] This application belongs to the field of injection device technology, and more specifically, relates to a drive component and a repetitive injection pen. Background Technology

[0002] As people's living standards rapidly improve, the number of people with diabetes is also increasing. In the future, the age of diabetes patients may gradually become younger. Therefore, the durability and reliability of pen-based insulin injectors currently on the market need to be improved.

[0003] There are two main types of syringes currently available for injecting insulin: one is a disposable syringe, in which the medication is pre-installed and the needle is inserted for self-injection by adjusting the dosage until the medication in the syringe is used up and then discarded; the other is a reusable syringe, in which the medication chamber and the driving device can be separated. When using this syringe, the medication and needle are installed separately and the medication is self-administered according to the preset dosage. After the medication is used up, the vial is removed and replaced with a new one. Currently, from an economic perspective, most pen-type insulin injectors on the market are reusable. A common problem is that due to the structural requirements of reusable pens, the plunger drive needs a hole connecting to the main body and the medication chamber. This can lead to leakage of the medication when the vial is subjected to bumps or severe vibrations. This leakage allows the medication to seep into the injector's mechanical structure through the central hole, affecting its use. This necessitates the replacement of the injector and its contents, incurring significant costs in terms of manpower, financial resources, and materials. Furthermore, if the medication seeps into the injector due to drops or other issues, it can damage the injector during use, preventing patients from receiving timely insulin injections. Since patients have strict requirements regarding the timing of insulin injections, this delay can significantly impact their health. Summary of the Invention

[0004] The purpose of this application is to provide a driving component and a reusable injection pen to solve the technical problem in the prior art where, during transportation or dropping, the medicine bottle breaks, causing the medicine to seep into the reusable injection pen, resulting in damage to the reusable injection pen and rendering it unusable.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A driving assembly for a repetitive injection pen is provided. The driving assembly includes a fixed plug, a sealing gasket, a push rod drive, and a first push rod. The fixed plug is cylindrical, and its side wall has a water outlet hole. The sealing gasket is disc-shaped and disposed within the fixed plug, with its outer side wall fitting against the inner side wall of the fixed plug. A first drain hole is provided on the first end face of the sealing gasket. A second drain hole is provided on the side wall of the sealing gasket, communicating with both the first and the water outlet hole. The first end face of the sealing gasket is connected to the drug chamber of the syringe. The push rod drive is cylindrical and disposed within the fixed plug, with its outer side wall fitting against the inner side wall of the fixed plug. The push rod drive engages with the second end face of the sealing gasket. A through hole is provided on the sealing gasket, and one end of the first push rod passes through the through hole of the sealing gasket and connects to the push rod drive, which drives the first push rod to move.

[0006] Optionally, the first end face of the sealing gasket is provided with a blocking structure to block the through hole and the first drain hole, so as to prevent the liquid medicine from flowing into the second end face of the sealing gasket through the first push rod.

[0007] Optionally, the blocking structure protrudes from the first end face of the sealing gasket, and the blocking structure is annular; the first drain hole is located on the outside of the blocking structure.

[0008] Optionally, the diameter of the through hole is equal to the outer diameter of the first push rod.

[0009] Optionally, the first push rod is a screw rod, and the through hole is threadedly connected to the first push rod.

[0010] Optionally, the inner wall of the fixed plug is provided with a plurality of guide posts, which are arranged along the axial direction of the fixed plug; the axial direction of the push rod drive is provided with a plurality of guide groove notches, the guide posts are slidably connected to the guide groove notches and terminate at the circumferential surface of the push rod drive, which is used to realize the bidirectional movement of the first push rod by adjusting the position of the push rod drive on the fixed plug, thereby realizing the repeated use of the reusable injection pen.

[0011] Optionally, the sealing gasket has a first boss and a second boss on the end face near the push rod drive end, and a second notch is provided between the plurality of guide groove notches of the push rod drive. The first boss and the guide groove notch cooperate to seal; the second boss and the second notch cooperate to seal, so as to realize the push rod drive and the second end face of the sealing gasket engaging.

[0012] Optionally, the push rod drive is provided with a threaded hole, the threaded hole is arranged along the axial direction of the push rod drive, the first push rod has an external thread, and the external thread is threadedly connected to the threaded hole.

[0013] Optionally, the outer wall of the fixing plug is provided with a threaded structure, which is used to connect with the medicine chamber by threads.

[0014] This application also provides a reusable injection pen, including a housing, a plunger cylinder, a transmission mechanism, a tailstock, a second plunger, and the aforementioned driving assembly; one end of the fixing plug is snapped into the housing; the plunger cylinder is cylindrical, one end of the plunger cylinder is the driving end, and the other end of the plunger cylinder is inserted into the housing; the transmission mechanism includes a connecting cylinder, a first rotating cylinder gear, and a second rotating cylinder gear arranged sequentially along the direction from the driving end to the other end of the plunger cylinder, the second rotating cylinder gear meshing with the plunger cylinder for transmission; the tailstock is connected to the first end of the connecting cylinder, and the tailstock can rotate relative to the connecting cylinder; the second plunger is slidably connected to the first rotating cylinder gear along its axial direction, and the end face of the second plunger has a gear portion; wherein, the side of the plunger driving away from the sealing gasket is provided with a first plunger gear, the first plunger is slidably connected to the first plunger gear along its axial direction, after the vial is installed, the gear portion of the second plunger meshes with the first plunger gear, during injection, the gear portion of the second plunger drives the first plunger gear to rotate, thereby driving the first plunger to move.

[0015] The beneficial effects of the driving component and reusable injection pen provided in this application are as follows: Compared with the prior art, the driving component of this application, by providing a water outlet hole on the fixed plug and a first drain hole and a second drain hole on the sealing gasket, with the first drain hole, the second drain hole and the water outlet hole being interconnected, allows the liquid to be discharged to the outside of the reusable injection pen through the first drain hole, the second drain hole and the water outlet hole when liquid leakage occurs in the medicine chamber; this improves the durability and reliability of the driving component and the reusable injection pen, and reduces the problem of damage to the driving component and the reusable injection pen or affecting its use due to liquid leakage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of a driving component provided in an embodiment of this application;

[0018] Figure 2 This is an exploded structural diagram of a driving component provided in an embodiment of this application;

[0019] Figure 3 A cross-sectional structural diagram of a driving component provided in an embodiment of this application;

[0020] Figure 4 This is a three-dimensional structural diagram of a fixing plug in a drive assembly provided in an embodiment of this application;

[0021] Figure 5 This is a cross-sectional structural diagram of a fixed plug in a drive assembly provided in an embodiment of this application;

[0022] Figure 6 A three-dimensional structural diagram of a sealing gasket in a drive assembly provided in this application embodiment. Figure 1 ;

[0023] Figure 7 A three-dimensional structural diagram of a sealing gasket in a drive assembly provided in this application embodiment. Figure 2 ;

[0024] Figure 8 A cross-sectional structural diagram of a push rod drive in a drive assembly provided in this application embodiment;

[0025] Figure 9 A three-dimensional structural diagram of a reusable injection pen provided in an embodiment of this application;

[0026] Figure 10 This is a cross-sectional structural diagram of a reusable injection pen provided in an embodiment of this application;

[0027] Figure 11 A three-dimensional structural diagram of the push rod and rotating cylinder in a reusable injection pen provided for an embodiment of this application;

[0028] Figure 12 A three-dimensional structural schematic diagram of a transfer cylinder support for a reusable injection pen provided in an embodiment of this application;

[0029] Figure 13 A three-dimensional structural diagram of the second push rod in a reusable injection pen provided for an embodiment of this application;

[0030] Figure 14 A three-dimensional structural schematic diagram of the first push rod gear in a reusable injection pen provided for an embodiment of this application;

[0031] Figure 15 A schematic diagram of the internal structure of a reusable injection pen provided in this application embodiment. Figure 1 ;

[0032] Figure 16A schematic diagram of the internal structure of a reusable injection pen provided in this application embodiment. Figure 2 .

[0033] The following are the labeling elements in the figure:

[0034] 100-Fixing plug; 101-Water outlet; 102-Guide post; 103-Threaded structure; 104-First snap-fit; 105-Second snap-fit;

[0035] 200 - Sealing gasket; 201 - Blocking structure; 202 - First drain hole; 203 - Second drain hole; 204 - First boss; 205 - Second boss; 206 - Through hole;

[0036] 300 - Push rod drive; 301 - Guide groove notch; 302 - Second notch; 303 - Threaded hole;

[0037] 400 - First push rod; 401 - Boss; 402 - First limiting groove;

[0038] 500 - Casing;

[0039] 600-Push rod rotary cylinder; 601-Receiving hole; 610-Tail cap; 620-Dosing component;

[0040] 700 - Rotary drum bracket; 701 - First slot;

[0041] 800-Front end push handle; 801-First push rod gear; 811-Connecting hole; 812-First limiting rib; 802-Tail handle; 821-Small spring;

[0042] 901-Second push rod; 911-Gear section; 912-Second limiting groove; 913-Step section; 902-Connecting cylinder; 903-First rotating cylinder gear; 904-Second rotating cylinder gear; 905-Third rotating cylinder gear; 951-Large spring; 906-Second push rod gear; 907-Middle spring. Detailed Implementation

[0043] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0044] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0045] It should be understood that the terms "length", "width", "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.

[0046] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0047] This embodiment provides a driving component for a reusable injection pen to achieve drug injection. Please refer to the following: Figure 1 and Figure 2 The driving assembly provided in the embodiments of this application will now be described. The driving assembly includes a fixed plug 100, a sealing gasket 200, a push rod drive 300, and a first push rod 400; the fixed plug 100 is cylindrical, and a water outlet hole 101 is provided on the side wall of the fixed plug 100; the sealing gasket 200 is disc-shaped, and the sealing gasket 200 is disposed inside the fixed plug 100, with the outer side wall of the sealing gasket 200 fitting against the inner side wall of the fixed plug 100; please refer to the following: Figure 3 and Figure 6 The sealing gasket 200 has a first drain hole 202 on its first end face; the outer wall of the sealing gasket 200 has a second drain hole 203, which communicates with the interior of the first drain hole 202 and with the water outlet 101. The first end face of the sealing gasket 200 is connected to the medicine chamber of the syringe. The push rod drive 300 is cylindrical and is disposed inside the fixed plug 100. The outer wall of the push rod drive 300 is fitted to the inner wall of the fixed plug 100, and the push rod drive 300 is engaged with the second end face of the sealing gasket 200. The sealing gasket 200 has a through hole 206, and one end of the first push rod 400 passes through the through hole 206 of the sealing gasket 200 and is connected to the push rod drive 300. The push rod drive 300 is used to drive the first push rod 400 to move.

[0048] Compared with the prior art, the driving component provided in this application provides a water outlet 101 on the fixed plug 100 and a first drain hole 202 and a second drain hole 203 on the sealing gasket 200. The first drain hole 202, the second drain hole 203 and the water outlet 101 are interconnected. When the medicine chamber leaks, the medicine can be discharged to the outside of the reusable injection pen through the first drain hole 202, the second drain hole 203 and the water outlet 101. This improves the durability and reliability of the driving component and the reusable injection pen, and reduces the problem of damage to the driving component and the reusable injection pen or affecting its use due to medicine leakage.

[0049] In this embodiment, the fixed plug 100 is generally cylindrical in shape, and the water outlet 101 is provided to drain leaked liquid, thereby preventing the liquid from entering the internal structure of the drive assembly and improving the durability and reliability of the drive assembly. The specific number and position of the water outlet 101 can be designed and adjusted according to actual needs to achieve a good drainage effect.

[0050] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The first end face of the sealing gasket 200 is provided with a blocking structure 201 to block the through hole 206 and the first drain hole 202, so as to prevent the liquid medicine from flowing into the second end face of the sealing gasket 200 through the first push rod 400.

[0051] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The blocking structure 201 protrudes from the first end face of the sealing gasket 200; the blocking structure 201 is annular; the first drain hole 202 is located on the outside of the blocking structure 201.

[0052] In this embodiment, the first drain hole 202 is located on the outside of the blocking structure 201 and is used to drain leaked liquid. When the liquid leaks, it can be discharged through the first drain hole 202, thereby preventing the liquid from entering the internal structure of the drive assembly. The side wall of the sealing gasket 200 is provided with a second drain hole 203, which communicates with the first drain hole 202 and the water outlet 101. In this way, the leaked liquid can be discharged sequentially through the first drain hole 202, the second drain hole 203, and the water outlet 101, achieving effective drainage of the leaked liquid. Multiple first drain holes 202 and second drain holes 203 can be provided, with each first drain hole 202 and second drain hole 203 corresponding to a water outlet 101. The specific number and position of the first drain holes 202 and second drain holes 203 can be designed and adjusted according to actual needs to achieve a good drainage effect.

[0053] It should be noted that after the syringe falls, the refill pen is usually placed horizontally on the drop surface. At this time, after the vial breaks, the liquid will fall onto the circumference of the vial under the action of gravity. When the refill pen is then picked up vertically, the liquid will flow down the circumference of the vial and then be discharged through the first drain hole 202, the second drain hole 203 and the water outlet 101 in sequence. The design of the blocking structure 201 can greatly reduce the possibility of the refill pen cartridge being contaminated after it is broken due to a drop.

[0054] In this embodiment, the push rod drive 300 is disposed within the fixed plug 100 and engages with the second end face of the sealing gasket 200. The push rod drive 300 drives the first push rod 400 to move, thereby pushing the piston in the drug chamber to inject the drug. The engaging connection between the push rod drive 300 and the sealing gasket 200 ensures the sealing of the drive assembly and prevents drug leakage.

[0055] In one embodiment of this application, please refer to the following: Figure 5 and Figure 8 The inner wall of the fixed plug 100 is provided with a guide post 102, which is arranged along the axial direction of the fixed plug 100. The outside of the push rod drive 300 is provided with a guide groove notch 301. The guide post 102 is slidably connected to the guide groove notch 301 and terminates on the circumferential surface of the push rod drive 300. This is used to realize the bidirectional movement of the first push rod 400 by adjusting the position of the push rod drive 300 on the fixed plug 100, thereby realizing the repeated use of the reusable injection pen.

[0056] In this embodiment, by setting the guide post 102 and the guide groove notch 301, precise guidance and positioning between the fixed plug 100 and the push rod drive 300 are achieved, effectively improving the stability and reliability of the equipment. Specifically, the guide post 102, as a guiding component, is precisely designed and machined in shape and size, enabling it to be accurately inserted into the guide groove notch 301, thereby guiding the linear motion trajectory between components. This design not only ensures the stability and smoothness of the components during movement but also effectively reduces friction and wear between components, extending the service life of the equipment.

[0057] In one embodiment of this application, please refer to the following: Figure 7 and Figure 8The sealing gasket 200 has a first boss 204 on its end face near the push rod drive 300. A second notch 302 is provided between the multiple guide groove notches 301 of the push rod drive 300. The first boss 204 and the guide groove notches 301 cooperate to seal; the second boss 205 and the second notch 302 cooperate to seal, so as to realize the engagement between the push rod drive 300 and the second end face of the sealing gasket 200. It should be noted that the design of the second notch 302 is for injection molding requirements. If it is not set as a notch, it is difficult to injection mold a film. Therefore, it needs to be designed as a notch shape, which will easily allow liquid medicine to seep into the pen refill structure from the second notch 302.

[0058] In this embodiment, the first boss 204 and the guide groove notch 301 are interference-fitted, thereby ensuring that the sealing gasket 200 is firmly secured to the push rod drive 300. Multiple first bosses 204 can be provided, and the number and position of the guide groove notches 301 correspond one-to-one with the first bosses 204. For example, in this embodiment, there are four first bosses 204, and correspondingly, four guide groove notches 301 are also provided, with one first boss 204 corresponding to one guide groove notch 301.

[0059] In this embodiment, by providing a first boss 204 and a guide groove notch 301, the first boss 204 can be smoothly inserted into the guide groove notch 301 during assembly, thereby achieving rapid positioning and connection between the two components. This design not only simplifies the assembly process and improves assembly efficiency, but also ensures that the connection between the components is stable and reliable, and is less prone to loosening or falling off.

[0060] Furthermore, the first boss 204 and the guide groove notch 301 in this embodiment also serve a guiding function. During assembly, the user can judge the relative position of the first boss 204 and the guide groove notch 301 by observation and touch, thereby completing the assembly more accurately. This guiding function not only improves the accuracy of assembly but also helps reduce the error rate during the assembly process.

[0061] In this embodiment, the second boss 205 and the second notch 302 are interference-fitted. By setting the second boss 205 and the second notch 302, the stability of the connection between the sealing gasket 200 and the push rod drive 300 can be further improved. Multiple second bosses 205 can be provided, and the number and position of the second notches 302 correspond one-to-one with the second bosses 205. For example, in this embodiment, there are four second bosses 205, and correspondingly, four second notches 302 are also provided, with one second boss 205 corresponding to one second notch 302.

[0062] Specifically, the second boss 205 has a size and shape that matches the second notch 302, so that it can be smoothly inserted into the second notch 302 to achieve a stable and reliable connection. This plug-in mating method not only simplifies the installation process and improves assembly efficiency, but also effectively prevents the sealing gasket 200 from loosening or falling off during the push rod drive 300 process, thereby ensuring the stability and reliability of the entire system.

[0063] In this embodiment, the second boss 205 is specifically disposed in the groove between two adjacent first bosses 204, and the guide groove notch 301 extends outward along its length direction to form the second notch 302.

[0064] In another embodiment of this application, the inner wall of the through hole 206 of the sealing gasket 200 is provided with a lubricating layer (not shown). This lubricating layer is designed to reduce the frictional resistance of the first push rod 400 when it moves within the through hole 206, thereby ensuring that the first push rod 400 can move more smoothly and stably along the axial direction. The lubricating layer can be made of various materials with lubricating properties, such as polytetrafluoroethylene, graphite, etc. These materials can effectively reduce direct contact between metals, thereby reducing wear and friction.

[0065] Meanwhile, to further improve the sealing performance of the sealing gasket 200, a sealing ring (not shown) is provided at the entrance of the through hole 206 in this embodiment. This sealing ring is made of an elastic material, such as silicone or rubber, and can fit tightly against the outer surface of the first push rod 400, thereby preventing leakage of the medicine from the through hole 206. When the first push rod 400 moves within the through hole 206, the sealing ring deforms accordingly, always maintaining close contact with the first push rod 400, achieving a dynamic sealing effect.

[0066] In one embodiment of this application, the diameter of the through hole 206 is equal to the outer diameter of the first push rod 400; or, the through hole 206 is threadedly connected to the first push rod 400. This configuration can further improve the sealing performance between the sealing gasket 200 and the first push rod 400, and further prevent the liquid medicine from entering the internal structure of the reusable injection pen.

[0067] In one embodiment of this application, please refer to Figure 8 The push rod drive 300 is provided with a threaded hole 303, which is set along the axial direction of the push rod drive 300. The first push rod 400 has an external thread, which is threadedly connected to the threaded hole 303.

[0068] In this embodiment, a threaded hole 303 is provided on the push rod drive 300. This design not only enhances the structural stability of the push rod drive 300 but also facilitates its connection with the first push rod 400. The threaded hole 303 extends along the axial direction of the push rod drive 300, making the connection more secure and less prone to loosening. The first push rod 400 is equipped with external threads, which allows the first push rod 400 to achieve a threaded transmission connection with the threaded hole 303 on the push rod drive 300. When the first push rod 400 is rotated, the interaction between its external threads and the threaded hole 303 allows the first push rod 400 to move along the axial direction of the push rod drive 300. This connection method not only makes the connection between the push rod drive 300 and the first push rod 400 tighter but also makes operation very convenient, greatly improving work efficiency.

[0069] In one embodiment of this application, please refer to Figure 4 The outer wall of the fixed plug 100 is provided with a threaded structure 103, which is used to connect with the medicine chamber by threads.

[0070] The working principle of the driving component provided in this embodiment is as follows: When a medicine bottle containing liquid medicine is accidentally broken, the liquid medicine inside the bottle will flow out. To prevent the liquid medicine from flowing into the pen body, the cooperation of a sealing gasket 200 with a first drainage hole 202, a second drainage hole 203, and a blocking structure 201, and a fixing plug 100 with a water outlet 101 can prevent the liquid medicine from seeping in. The blocking structure 201 on the rubber gasket 3 is circumferentially sealed to the end of the medicine bottle, preventing the liquid medicine leaking from the end of the medicine bottle from flowing into the interior of the reusable pen, i.e., the pen core, through the through hole 206 of the rubber gasket, so that the leaked liquid medicine can only flow to the first drainage hole 202 of the rubber gasket 3. Since the first drainage hole 202, the second drainage hole 203, and the water outlet 101 are interconnected, when liquid medicine flows into the first drainage hole 202 of the sealing gasket 200, it will flow out through the water outlet 101 of the connected fixing plug 100, thereby allowing the leaked liquid medicine to flow out of the reusable pen, thereby improving economy and the reusability of the reusable pen.

[0071] This application also provides a reusable injection pen, please refer to it as well. Figure 9 and Figure 10The reusable injection pen includes a housing 500, a plunger-rotor 600, a transmission mechanism, a tail shank 802, a second plunger 901, and the aforementioned drive assembly; one end of the retaining plug 100 is snapped into the housing 500; the plunger-rotor 600 is cylindrical, with one end serving as the drive end and the other end inserted into the housing 500; the transmission mechanism includes a connecting cylinder 902, a first rotary gear 903, and a second rotary gear 904 arranged sequentially along the direction from the drive end to the other end of the plunger-rotor 600, with the second rotary gear 904 meshing with the plunger-rotor 600 for transmission; the tail shank 802 and the connecting cylinder 902... The first end of the 2 is connected, and the tail shank 802 can rotate relative to the connecting cylinder 902; the second push rod 901 is slidably connected to the first rotating cylinder gear 903 along its axial direction, and the end face of the second push rod 901 has a gear part 911; wherein, the push rod drive 300 is provided with a first push rod gear 801 on the side away from the sealing gasket, and the first push rod is slidably connected to the first push rod gear 801 along its axial direction. After the medicine bottle is installed, the gear part 911 of the second push rod meshes with the first push rod gear 801. During injection, the gear part 911 of the second push rod 901 drives the first push rod gear 801 to rotate, thereby driving the first push rod 400 to move.

[0072] In this embodiment, please refer to Figure 10 The refillable injection pen also includes a tail cap 610 and a dosing member 620. The dosing member 620 is used to adjust the dose of the delivered drug and display the counted quantity. For example, Figure 11 As shown, the drive end of the push rod cylinder 600 is provided with a receiving hole 601. One end of the dosage member 620 is an insertion end, and the insertion end of the dosage member 620 is sleeved on the push rod cylinder 600 by the other end of the push rod cylinder 600, with the insertion end passing through the receiving hole 601. To further improve the fixing effect of the device, a tail cap 610 is set in the receiving hole 601, and a snap-fit ​​structure is provided between the push rod cylinder 600, the tail cap 610, and the dosage member 620. Specifically, this snap-fit ​​structure is used to fix the push rod cylinder 600, the tail cap 610, and the dosage member 620. Specifically, by providing a snap-fit ​​structure between the push rod cylinder 600, the tail cap 610, and the dosage member 620, the three parts can be snapped together, so that the three parts cannot move axially or rotate relative to each other. Furthermore, by fitting the dosing component 620 onto the push rod cylinder 600 and placing the tail cap 610 inside the receiving hole 601 of the push rod cylinder 600, the size of the device can be reduced and the portability of the device can be improved.

[0073] Specifically, during the assembly of the reusable injection pen, the insertion end of the dosing component 620 is first fitted onto the push rod cylinder 600 from the end furthest from the drive end, with the insertion end passing through the receiving hole 601 of the push rod cylinder 600. Then, the tail cap 610 is placed within the receiving hole 601, and the drive mechanism is secured using a snap-fit ​​structure between the push rod cylinder 600, the tail cap 610, and the dosing component 620. This snap-fit ​​structure facilitates the securing of all three components, reduces production costs, improves device quality, increases product yield, and extends product lifespan.

[0074] In this embodiment, a limiting part is provided between the push rod cylinder 600 and the tail cover 610. The limiting part is used to fix the tail cover 610 and the drive member 2 to prevent the tail cover 610 from detaching from the push rod cylinder 600 and / or the tail cover 610 from rotating relative to the push rod cylinder 600.

[0075] like Figure 10 and Figure 12 As shown, the repetitive injection pen also includes a rotary cylinder support 700, which is fixedly disposed within the receiving cavity of the outer shell. The push rod rotary cylinder 600 is movably disposed within the rotary cylinder support 700, and the dosage component 620 is located on the outer side of the rotary cylinder support 700. This arrangement facilitates observation of the scale on the dosage component 620. In this embodiment, one end of the rotary cylinder support 700 is fixedly connected to the shell and located within the shell, while the other end of the rotary cylinder support 700 is located inside the dosage component 620. The rotary cylinder support 700 and the push rod rotary cylinder 600 are threadedly connected. To improve the connection stability of the device, a limiting structure is provided between the rotary cylinder support 700 and the push rod rotary cylinder 600. This limiting structure prevents the push rod rotary cylinder 600 from dislodging from the rotary cylinder support 700. Specifically, by providing the limiting structure, when the dosage is adjusted via the push rod rotary cylinder 600, the limiting structure prevents the push rod rotary cylinder 600 from dislodging from the rotary cylinder support 700 when the maximum dosage of the device is reached.

[0076] Specifically, both the push rod cylinder 600 and the cylinder support 700 are provided with threaded structures. The threaded structure of the push rod cylinder 600 has a limiting boss, and the threaded structure of the cylinder support 700 has a limiting groove. The limiting boss and the limiting groove form a limiting structure, which cooperates to prevent the push rod cylinder 600 from dislodging from the cylinder support 700. In this embodiment, the limiting groove is formed at the point where the threaded structure on the cylinder support 700 is partially broken.

[0077] Specifically, the limiting boss is located at the end of the push rod cylinder 600 furthest from the drive end, and correspondingly, the limiting groove is located at the end of the cylinder support 700 closest to the push rod cylinder 600. Both the limiting boss and the limiting groove are located at the thread cutoff point of the threaded structure. To facilitate the assembly of the push rod cylinder 600 and the cylinder support 700, an opening is provided at the end of the push rod cylinder 600 furthest from the drive end. The opening extends along the axial direction of the push rod cylinder 600 and is located on one side of the limiting boss along the circumferential direction of the push rod cylinder 600. The end face of the limiting boss near the opening is parallel to the opening, the end face of the limiting boss furthest from the opening is a bevel, and the end of the limiting groove is chamfered.

[0078] When assembling the push rod cylinder 600 and the cylinder support 700, the limiting boss of the push rod cylinder 600 first contacts the limiting groove of the cylinder support 700, specifically, the side of the limiting boss with the bevel first contacts the limiting groove. Then, the opening of the push rod cylinder 600 is pressed to deform the end of the push rod cylinder 600, so that the push rod cylinder 600 is inserted into the cylinder support 700, and the limiting boss and the limiting groove cooperate to prevent the push rod cylinder 600 from coming out of the cylinder support 700. Furthermore, by providing a bevel on the limiting boss and chamfering the end of the limiting groove, the assembly of the push rod cylinder 600 and the cylinder support 700 is facilitated.

[0079] In this embodiment, please refer to Figure 15 The first rotary gear 903 and the second rotary gear 904 have their first end faces meshed by gears. A step is provided on the inner wall of the push rod rotary cylinder 600 away from the drive end. A gear is provided on the side of the step facing the tail shank 802. The second end face of the second rotary gear 904 meshes with the gear. The first rotary gear 903, the second rotary gear 904, and the connecting cylinder 902 can all move axially relative to the push rod rotary cylinder 600. The inner surface of the first rotary gear 903 has a second limiting rib, such as... Figure 13 As shown, the outer surface of the second push rod 901 has a second limiting groove 912. The second limiting rib engages with the second limiting groove 912, ensuring that the first rotary gear 903 can only move axially relative to the second push rod 901, preventing relative rotation. With this structure, after rotating to the set dosage, pressing the push rod rotary cylinder 600 keeps the first rotary gear 903, the second rotary gear 904, and the connecting cylinder 902 axially stationary but rotate simultaneously. This causes the first rotary gear 903 to drive the second push rod 901 to rotate simultaneously, ensuring power transmission and completing the injection operation.

[0080] In this embodiment, please refer to Figure 15 and Figure 16The repetitive injection pen also includes a third rotary cylinder gear 905 and a second push rod gear 906. The third rotary cylinder gear 905 and the second push rod gear 906 are meshed by gears, and the first push rod gear 801 and the second push rod 901 are meshed by gears.

[0081] In this embodiment, as Figure 13 and Figure 16 As shown, the second push rod 901 has a stepped portion 913 at one end near the gear portion 911. A middle spring 907 is provided between the stepped portion 913 and the second push rod gear 906. Under the elastic force of the middle spring 907, the second push rod gear 906 and the third rotary cylinder gear 905 are in a meshing state. Furthermore, a small spring 821 is provided between the tail handle 802 and the connecting cylinder 902. With the above structure, when the syringe is adjusted forward to increase the scale, the push rod cylinder 600 will rotate relative to the second rotary cylinder gear 904; when the syringe is adjusted backward to decrease the scale, the first rotary cylinder gear 903 will rotate relative to the second rotary cylinder gear 904. However, since the torque generated by the jumping of the small spring 821 is less than the torque required to disengage the third rotary cylinder gear 905 from the meshing state with the second push rod gear 906, no injection effect is produced regardless of whether the adjustment is forward or backward.

[0082] like Figure 14 As shown, the first push rod gear 801 is provided with a connecting hole 811, which is coaxially arranged with the threaded hole 303. The inner surface of the first push rod gear 801 has a first limiting rib 812, and the outer surface of the first push rod 400 has a first limiting groove 402. The first limiting rib 812 cooperates with the first limiting groove 402. Since the first push rod gear 801 is fixed on the push rod drive 300, the first push rod 400 can only move axially relative to the first push rod gear 801 and cannot rotate relative to the first push rod gear 801.

[0083] In this embodiment, the push rod drive 300 is fixedly mounted on the fixed plug 100, and the inner wall of the push rod drive 300 is provided with internal threads, while the outer surface of the first push rod 400 is provided with external threads. Since the push rod drive 300 and the first push rod 400 are threadedly engaged, when the first push rod 400 rotates, it will move axially relative to the push rod drive 300, thereby achieving injection or repositioning operations. Furthermore, to improve the drug delivery effect of the first push rod 400, a piston is provided at the end of the first push rod 400 furthest from the driving component.

[0084] In this embodiment, after the medicine bottle is placed into the medicine chamber, the medicine chamber is threaded onto the fixed plug 100. The side of the medicine bottle closest to the fixed plug 100 will contact the push rod drive 300, applying an axial force to the push rod drive 300, causing the first push rod gear 801 and the second push rod 901 to mesh. Furthermore, a large spring 951 (e.g., [missing information]) is provided between the push rod drive 300 and the third rotary drum gear 905. Figure 15 As shown, when the medicine chamber is removed from the fixed plug 100, the first push rod gear 801 will be displaced relative to the second push rod 901 under the elastic force of the large spring 951. At this time, the first push rod gear 801 is not in a meshing state with the second push rod 901.

[0085] The working principle of the reusable injection pen provided in this embodiment is as follows:

[0086] (1) Injection process

[0087] Pushing the tailstock 802 by hand transmits axial force to the push rod cylinder 600 via the connecting cylinder 902, the first rotating cylinder gear 903, and the second rotating cylinder gear 904. Since the push rod cylinder 600 is threadedly connected to the rotating cylinder support 700, it rotates under the axial thrust. When the push rod cylinder 600 rotates, the first rotating cylinder gear 903 and the second rotating cylinder gear 904 are all gear-meshing. The push rod cylinder 600 drives the second rotating cylinder gear 904 to rotate, and the second rotating cylinder gear 904 drives the first rotating cylinder gear 903 to rotate. Furthermore, due to the engagement of the second limiting rib and the second limiting groove 912, the second push rod 901 rotates. At this time, the first push rod gear 801 also rotates because it is gear-meshing with the second push rod 901. With the first limiting rib 812 cooperating with the first limiting groove 402, the first push rod 400 will rotate with the first push rod gear 801. Since the push rod drive 300 and the first push rod 400 are threadedly connected, the first push rod 400 will move axially relative to the push rod drive 300, thereby achieving the injection effect.

[0088] (2) Reset process

[0089] Rotate the medicine chamber to detach it from the fixed plug 100. Under the elastic force of the large spring 951, the first push rod gear 801 will shift relative to the second push rod 901. At this time, the first push rod gear 801 is not engaged with the second push rod 901. Push the first push rod 400 to rotate under the force. Since the first push rod gear 801 is not engaged with the second push rod 901, the second push rod 901 remains stationary while the first push rod 400 rotates and moves axially. Continue pushing the first push rod 400 until it returns to its initial state, thus completing the reset.

[0090] (3) Callback process

[0091] By rotating the push rod cylinder 600 counterclockwise to reduce the scale, the push rod cylinder 600 and the second cylinder gear 904 are relatively stationary, while the first cylinder gear 903 rotates relative to the second cylinder gear 904. Due to the elastic force of the middle spring 907, the third cylinder gear 905 and the second push rod gear 906 are in a meshing state. Moreover, the torque generated by the jumping of the small spring 821 is less than the torque required to disengage the third cylinder gear 905 and the second push rod gear 906 from the meshing state. Therefore, no injection effect will be produced during the retraction process.

[0092] (4) Positive adjustment process

[0093] By rotating the push rod cylinder 600 clockwise to increase the scale, the first cylinder gear 903 and the second cylinder gear 904 are relatively stationary, while the push rod cylinder 600 rotates relative to the second cylinder gear 904. Due to the elastic force of the middle spring 907, the third cylinder gear 905 and the second push rod gear 906 are in a meshing state. Moreover, the torque generated by the jumping of the small spring 821 is less than the torque required to disengage the third cylinder gear 905 and the second push rod gear 906 from the meshing state. Therefore, no injection effect will be produced during the adjustment process.

[0094] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A driving component for a repetitive injection pen, characterized in that, include: A fixed plug, the fixed plug being cylindrical in shape, and the side wall of the fixed plug being provided with a water outlet hole; A sealing gasket, which is disc-shaped, is disposed inside the fixing plug, with its outer side wall fitting against the inner side wall of the fixing plug; a first drain hole is provided on the first end face of the sealing gasket; a second drain hole is provided on the outer side wall of the sealing gasket, which communicates with the first drain hole and with the water outlet hole; and the first end face of the sealing gasket is connected to the medicine chamber of the syringe. A push rod drive, the push rod drive is cylindrical, the push rod drive is disposed inside the fixed plug, the outer side wall of the push rod drive is fitted to the inner side wall of the fixed plug, and the push rod drive is engaged with the second end face of the sealing gasket; as well as The first push rod has a through hole on the sealing gasket. One end of the first push rod passes through the through hole of the sealing gasket and is connected to the push rod drive. The push rod drive is used to drive the first push rod to move.

2. The driving component as described in claim 1, characterized in that, The first end face of the sealing gasket is provided with a blocking structure to block the through hole and the first drain hole, so as to prevent the liquid medicine from flowing into the second end face of the sealing gasket through the first push rod.

3. The driving component as described in claim 2, characterized in that, The blocking structure protrudes from the first end face of the sealing gasket, and the blocking structure is annular; the first drain hole is located on the outside of the blocking structure.

4. The driving component as described in claim 1, characterized in that, The diameter of the through hole is equal to the outer diameter of the first push rod.

5. The driving component as described in claim 1, characterized in that, The first push rod is a screw rod, and the through hole is threadedly connected to the first push rod.

6. The driving component as claimed in claim 1, characterized in that, The inner wall of the fixed plug is provided with multiple guide posts, which are arranged along the axial direction of the fixed plug; the circumferential direction of the push rod drive is provided with multiple guide groove notches, and the guide posts are slidably connected to the guide groove notches and terminate at the circumferential surface of the push rod drive, so as to realize the bidirectional movement of the first push rod by adjusting the position of the push rod drive on the fixed plug, thereby realizing the repeated use of the reusable injection pen.

7. The driving component as described in claim 6, characterized in that, The second end face of the sealing gasket is provided with a first boss and a second boss, and a second notch is provided between the plurality of guide groove notches driven by the push rod. The first boss and the guide groove notch cooperate to seal; the second boss and the second notch cooperate to seal, so as to realize the push rod drive and the second end face of the sealing gasket.

8. The driving component as claimed in claim 1, characterized in that, The push rod drive is provided with a threaded hole, which is arranged along the axial direction of the push rod drive. The first push rod has an external thread, which is threadedly connected to the threaded hole.

9. The driving component as described in any one of claims 1-8, characterized in that, The outer wall of the fixed plug is provided with a threaded structure, which is used to connect with the medicine chamber by threads.

10. A reusable injection pen, characterized in that, include: The driving component as described in any one of claims 1-9, The housing, one end of the retaining plug being snapped into the housing; A push rod rotating cylinder, wherein the push rod rotating cylinder is cylindrical, one end of the push rod rotating cylinder is the driving end, and the other end of the push rod rotating cylinder is inserted into the outer casing; The transmission mechanism includes a connecting cylinder, a first rotating cylinder gear, and a second rotating cylinder gear arranged sequentially along the direction from the driving end to the other end of the push rod rotating cylinder, wherein the second rotating cylinder gear meshes with the push rod rotating cylinder for transmission. A tail shank is connected to the first end of the connecting cylinder, and the tail shank can rotate relative to the connecting cylinder; as well as The second push rod is slidably connected to the first rotary gear along its axial direction, and the end face of the second push rod has a gear portion; The push rod has a first push rod gear on the side away from the sealing gasket. The first push rod is slidably connected to the first push rod gear along its axial direction. After the medicine bottle is installed, the gear part of the second push rod meshes with the first push rod gear. During injection, the gear part of the second push rod drives the first push rod gear to rotate, thereby driving the first push rod to move.

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