Driving assembly and repeated injection pen

Abstract

The utility model 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 technical field of injection devices, and more specifically, it relates to a drive assembly and a reusable injection pen. Background Art

[0002] With the rapid improvement of people's living standards, the number of diabetes patients is also increasing continuously. In the future, the age of diabetes patients may gradually become younger. Therefore, the durability and reliability of pen-type insulin syringes on the current market need to be improved.

[0003] Existing syringes for injecting insulin mainly include two types. One is a disposable syringe, in which the drug is pre-installed in the syringe. When in use, the needle is loaded, and then self-injection is directly carried out by adjusting the dose until the drug in the syringe is used up and then it is discarded. The other is a reusable syringe, which can separate the medicine chamber from the driving device. When this syringe is in use, after the drug and the needle are respectively installed, self-administration is carried out by presetting the dose. After the drug is used up, the medicine bottle is taken out and a new drug is replaced. Currently, from an economic perspective, most pen-type insulin syringes on the market are reusable. One of the more common problems is that due to the structural requirements of the reusable pen, the push rod drive needs to have holes communicating with the main body component and the medicine chamber component during setting. As a result, when the cartridge containing the drug undergoes jolting or severe vibration, the liquid medicine leaks. This leakage will cause the liquid medicine to invade the mechanical structure of the syringe through the middle hole, thus affecting the use of the syringe, and it is necessary to supplement or replace the new syringe and the internal drug, which is extremely laborious, costly and material-consuming. Further speaking, if the liquid medicine seeps into the main part of the syringe due to problems such as the dropping of the syringe, the syringe will be damaged due to the seepage of the liquid medicine during use, so that the patient fails to inject insulin in time. Since the patient has strict requirements on the time of injecting insulin, the injection opportunity will be delayed, which will greatly affect the patient's physical health. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a drive assembly and a reusable injection pen to solve the technical problem in the prior art that during transportation or dropping, the medicine bottle breaks and the liquid medicine seeps into the reusable injection pen, causing the reusable injection pen to be damaged and unable to be reused again.

[0005] To achieve the above object, the technical solution adopted in this application is as follows: A driving component is provided for a reusable injection pen. The driving component includes a fixed plug, a gasket, a push rod drive, and a first push rod. The fixed plug is cylindrical, and a water outlet hole is provided on the side wall of the fixed plug. The gasket is disc-shaped and is arranged inside the fixed plug. The outer side wall of the gasket fits with the inner side wall of the fixed plug. A first drainage hole is provided on the first end face of the gasket. A second drainage hole is provided on the side wall of the gasket. The second drainage hole communicates with the first drainage hole and also communicates with the water outlet hole. The first end face of the gasket is connected to the medicine chamber of the syringe. The push rod drive is cylindrical and is arranged inside the fixed plug. The outer side wall of the push rod drive fits with the inner side wall of the fixed plug for installation. The push rod drive is clamped with the second end face of the gasket. A through hole is provided on the gasket. One end of the first push rod passes through the through hole of the gasket and is connected to the push rod drive. The push rod drive is used to drive the first push rod to move.

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

[0007] Optionally, the blocking structure protrudes from the first end face of the gasket and is annular. The first drainage hole is located outside 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 in threaded transmission connection with the first push rod.

[0010] Optionally, a plurality of guide posts are provided on the inner wall of the fixed plug, and the guide posts are arranged along the axial direction of the fixed plug. A plurality of guide groove notches are provided axially on the push rod drive. The guide posts are slidably connected with 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, and further realize the reuse of the reusable injection pen.

[0011] Optionally, a first boss and a second boss are provided on the end face of the gasket close to the push rod drive. 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 are cooperatively sealed. The second boss and the second notch are cooperatively sealed to realize the clamping connection between the push rod drive and the second end face of the gasket.

[0012] Optionally, a threaded hole is provided on the push rod drive, and 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, an outer wall of the fixing plug is provided with a threaded structure, and the threaded structure is used for threaded connection with the medicine chamber.

[0014] The present application also provides a repetitive injection pen, comprising a housing, a push rod cylinder, a transmission mechanism, a tail handle, a second push rod and the above-mentioned drive assembly; one end of the fixed plug is clamped in the housing; the push rod cylinder is cylindrical, one end of the push rod cylinder is a driving end, and the other end of the push rod cylinder is inserted in the housing; the transmission mechanism comprises a connecting cylinder, a first cylinder gear and a second cylinder gear arranged in sequence along the direction from the driving end to the other end of the push rod cylinder, and the second cylinder gear is meshed with the push rod cylinder for transmission; the tail handle is connected to the first end of the connecting cylinder, and the tail handle can rotate relative to the connecting cylinder; the second push rod is slidably connected with the first cylinder gear along its axial direction, and the end face of the second push rod has a gear part; wherein, the first push rod drive is provided with a first push rod gear on the side away from the sealing gasket, and the first push rod is slidably connected with the first push rod gear along its axial direction, and after the medicine bottle is installed, the gear part of the second push rod is meshed with the first push rod gear, and 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.

[0015] The beneficial effects of the drive assembly and the repeat injection pen provided by the present application are as follows: compared with the prior art, the drive assembly of the present application, by setting a water outlet hole on the fixed plug, and setting a first drainage hole and a second drainage hole on the sealing gasket, the first drainage hole, the second drainage hole and the water outlet hole are interconnected, when liquid medicine leaks from the medicine chamber, the liquid medicine can be discharged to the outside of the repeat injection pen through the first drainage hole, the second drainage hole and the water outlet hole; the durability and reliability of the drive assembly and the repeat injection pen are improved, and the problem of damage to the drive assembly and the repeat injection pen or affecting the use due to liquid medicine leakage is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a driving assembly provided in an embodiment of the present application;

[0018] Figure 2 Explosion structure schematic diagram of a driving component provided by an embodiment of the present application;

[0019] Figure 3 Cross-sectional structure schematic diagram of a driving component provided by an embodiment of the present application;

[0020] Figure 4 Three-dimensional structure schematic diagram of a fixing plug in a driving component provided by an embodiment of the present application;

[0021] Figure 5 Cross-sectional structure schematic diagram of a fixing plug in a driving component provided by an embodiment of the present application;

[0022] Figure 6 Three-dimensional structure schematic diagram of a gasket in a driving component provided by an embodiment of the present application Figure 1 ;

[0023] Figure 7 Three-dimensional structure schematic diagram of a gasket in a driving component provided by an embodiment of the present application Figure 2 ;

[0024] Figure 8 Cross-sectional structure schematic diagram of a push rod drive in a driving component provided by an embodiment of the present application;

[0025] Figure 9 Three-dimensional structure schematic diagram of a reusable injection pen provided by an embodiment of the present application;

[0026] Figure 10 Cross-sectional structure schematic diagram of a reusable injection pen provided by an embodiment of the present application;

[0027] Figure 11 Three-dimensional structure schematic diagram of a push rod cylinder in a reusable injection pen provided by an embodiment of the present application;

[0028] Figure 12 Three-dimensional structure schematic diagram of a cylinder bracket in a reusable injection pen provided by an embodiment of the present application;

[0029] Figure 13 Three-dimensional structure schematic diagram of a second push rod in a reusable injection pen provided by an embodiment of the present application;

[0030] Figure 14 Three-dimensional structure schematic diagram of a first push rod gear in a reusable injection pen provided by an embodiment of the present application;

[0031] Figure 15 Internal structure schematic diagram of a reusable injection pen provided by an embodiment of the present application Figure 1 ;

[0032] Figure 16Schematic diagram of the internal structure of a repeated injection pen provided by an embodiment of the present application Figure 2 。

[0033] Among them, the reference numerals in the figure are as follows:

[0034] 100 - fixed plug; 101 - water outlet hole; 102 - guide post; 103 - thread structure; 104 - first buckle; 105 - second buckle;

[0035] 200 - 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 limit groove;

[0038] 500 - outer shell;

[0039] 600 - push rod rotating cylinder; 601 - accommodation hole; 610 - tail cover; 620 - dose member;

[0040] 700 - rotating cylinder bracket; 701 - first card slot;

[0041] 800 - front end push handle; 801 - first push rod gear; 811 - connection hole; 812 - first limit rib; 802 - tail handle; 821 - small spring;

[0042] 901 - second push rod; 911 - gear part; 912 - second limit groove; 913 - step part; 902 - connection 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 - medium spring. Detailed implementation manners

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

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

[0045] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0047] This embodiment provides a driving assembly for a repetitive injection pen to achieve drug injection. Please refer to Figure 1 and Figure 2 , and now the driving assembly provided by the embodiment of the present application will 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, the sealing gasket 200 is arranged inside the fixed plug 100, and the outer side wall of the sealing gasket 200 fits with the inner side wall of the fixed plug 100; please refer to Figure 3 and Figure 6 , a first drain hole 202 is provided on the first end face of the sealing gasket 200; a second drain hole 203 is provided on the outer side wall of the sealing gasket 200, the second drain hole 203 is internally connected to the first drain hole 202 and is connected to the water outlet hole 101, and 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, the push rod drive 300 is arranged inside the fixed plug 100, the outer side wall of the push rod drive 300 is fitted and installed with the inner side wall of the fixed plug 100, and the push rod drive 300 is clamped with the second end face of the sealing gasket 200; a through hole 206 is provided on the sealing gasket 200, 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, and 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 by this application has, in the driving component of the embodiment of this application, a water outlet hole 101 provided on the fixed plug 100, and a first drainage hole 202 and a second drainage hole 203 provided on the gasket 200. The first drainage hole 202, the second drainage hole 203 and the water outlet hole 101 are in communication with each other. When liquid medicine leaks in the medicine chamber, the liquid medicine can be discharged to the outside of the reusable injector pen through the first drainage hole 202, the second drainage hole 203 and the water outlet hole 101; the durability and reliability of the driving component and the reusable injector pen are improved, and the problems of damage to the driving component and the reusable injector pen or affecting the use due to liquid medicine leakage are reduced.

[0049] In this embodiment, the fixed plug 100 is generally in a cylindrical structure. The water outlet hole 101 is provided to discharge the leaked liquid medicine, so as to prevent the liquid medicine from entering the internal structure of the driving component, and the durability and reliability of the driving component are improved. The specific number and position of the water outlet hole 101 can be designed and adjusted according to actual needs to achieve a good liquid drainage effect.

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

[0051] In an embodiment of this application, please refer to Figure 1 and Figure 2 , the blocking structure 201 protrudes from the first end face of the gasket 200; the blocking structure 201 is in a circular ring shape; the first drainage hole 202 is located outside the blocking structure 201.

[0052] In this embodiment, the first drainage hole 202 is located outside the blocking structure 201 and is used to discharge the leaked liquid medicine. When the liquid medicine leaks, the liquid medicine can be discharged through the first drainage hole 202, so as to prevent the liquid medicine from entering the internal structure of the driving component. A second drainage hole 203 is provided on the side wall of the gasket 200. The second drainage hole 203 is in communication with the first drainage hole 202 and is also in communication with the water outlet hole 101. In this way, the leaked liquid medicine can be discharged in sequence through the first drainage hole 202, the second drainage hole 203 and the water outlet hole 101, realizing the effective discharge of the leaked liquid medicine. The number of the first drainage holes 202 and the second drainage holes 203 can be set to be multiple. The first drainage holes 202 and the second drainage holes 203 are arranged in one-to-one correspondence with the water outlet hole 101. The specific number and position of the first drainage holes 202 and the second drainage holes 203 can be designed and adjusted according to actual needs to achieve a good liquid drainage effect.

[0053] It should be noted that after the syringe drops, the reusable injection pen is generally placed horizontally on the dropping surface. At this time, after the medicine bottle is damaged, the liquid medicine will fall onto the circumferential arm of the medicine chamber bottle under the action of gravity. Then, when the reusable injection pen is vertically picked up, the liquid medicine will flow down along the circumferential arm of the medicine chamber bottle, and then pass through the first drain hole 202, the second drain hole 203 and the water outlet hole 101 in sequence and be discharged. Through the design of the blocking structure 201, the situation that the pen core is contaminated after the reusable injection pen drops and is damaged can be greatly reduced.

[0054] In this embodiment, the push rod drive 300 is arranged inside the fixed plug 100 and is clamped with the second end face of the sealing gasket 200. The push rod drive 300 is used to drive the first push rod 400 to move, so as to push the piston in the medicine chamber to inject the medicine. The clamping connection between the push rod drive 300 and the sealing gasket 200 can ensure the sealing performance of the drive assembly and prevent the liquid medicine from leaking.

[0055] In an embodiment of the present application, please refer to Figure 5 and Figure 8 , a guide post 102 is provided on the inner wall of the fixed plug 100, and the guide post 102 is arranged along the axial direction of the fixed plug 100; a guide groove notch 301 is provided on the outside of the push rod drive 300, and the guide post 102 is slidably connected with the guide groove notch 301 and terminates at the circumferential surface of the push rod drive 300, and 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, so as to realize the reuse of the reusable injection pen.

[0056] In this embodiment, by providing the guide post 102 and the guide groove notch 301, the precise guidance and positioning between the fixed plug 100 and the push rod drive 300 are realized, effectively improving the stability and reliability of the equipment. Specifically, the guide post 102, as a guiding component, its shape and size are precisely designed and processed, and it can accurately insert into the guide groove notch 301, so as to realize the guidance of the linear motion track between the components. This design can not only ensure the stability and smoothness of the components during the movement process, but also effectively reduce the friction and wear between the components and extend the service life of the equipment.

[0057] In an embodiment of the present application, please refer to Figure 7 and Figure 8, on the end face of the gasket 200 close to one end of the push rod drive 300, there is a first boss 204. Between the multiple guide groove notches 301 of the push rod drive 300, there is a second notch 302. The first boss 204 and the guide groove notch 301 cooperate for sealing; the second boss 205 and the second notch 302 cooperate for sealing to realize the clamping connection between the push rod drive 300 and the second end face of the gasket 200. It should be noted that the design of the second notch 302 is for injection molding requirements. If it is not designed as a notch, it is very difficult to injection mold into a film. Therefore, it needs to be designed as a notch shape, which may easily cause the liquid medicine to penetrate into the pen core structure from the second notch 302.

[0058] In this embodiment, the first boss 204 and the guide groove notch 301 are in interference fit, so as to firmly clamp the gasket 200 on the push rod drive 300. Multiple first bosses 204 can be provided, and the number and positions of the guide groove notches 301 are set in one-to-one correspondence with the first bosses 204. For example: in this embodiment, there are four first bosses 204. Correspondingly, there are also four guide groove notches 301. One first boss 204 is correspondingly clamped with one guide groove notch 301.

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

[0060] In addition, the first boss 204 and the guide groove notch 301 in this embodiment can also play a certain guiding role. During the assembly process, the user can judge the relative position between the first boss 204 and the guide groove notch 301 through observation and feel, so as to complete the assembly more accurately. This guiding role not only improves the accuracy of assembly, but also helps to reduce the error rate during the assembly process.

[0061] In this embodiment, the second boss 205 and the second notch 302 are in interference fit. By providing the second boss 205 and the second notch 302, the connection stability between the gasket 200 and the push rod drive 300 can be further improved. Multiple second bosses 205 can be provided, and the number and positions of the second notches 302 are set in one-to-one correspondence with the second bosses 205. For example: in this embodiment, there are four second bosses 205. Correspondingly, there are also four second notches 302. One second boss 205 is correspondingly clamped in one second notch 302.

[0062] Specifically, the second boss 205 has dimensions and a shape that match 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 and mating method not only simplifies the installation process and improves the assembly efficiency, but also effectively prevents the gasket 200 from loosening or falling off during the process of the push rod driving 300, thus ensuring the stability and reliability of the entire system.

[0063] In this embodiment, the second boss 205 is specifically arranged at 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 the present application, a lubricating layer (not shown) is provided on the inner wall of the through hole 206 of the gasket 200. The design of this lubricating layer aims to reduce the frictional resistance when the first push rod 400 moves in the through hole 206, so as to ensure that the first push rod 400 can move more smoothly and stably along the axial direction. The lubricating layer can be composed of various materials with lubricating properties, such as polytetrafluoroethylene, graphite, etc. These materials can effectively reduce the direct contact between metals, thereby reducing wear and friction.

[0065] At the same time, in order to further improve the sealing performance of the gasket 200, a sealing ring (not shown) is provided at the entrance of the through hole 206 in this embodiment. The sealing ring is made of an elastic material, such as silicone or rubber, and can closely fit on the outer surface of the first push rod 400, thereby preventing the liquid medicine from leaking from the through hole 206. When the first push rod 400 moves in the through hole 206, the sealing ring will deform accordingly and always maintain close contact with the first push rod 400 to achieve a dynamic sealing effect.

[0066] In an embodiment of the present application, the diameter of the through hole 206 is equal to the outer diameter of the first push rod 400; alternatively, the through hole 206 is in threaded transmission connection with the first push rod 400. With such a setting, the sealing performance between the gasket 200 and the first push rod 400 can be further improved, and the liquid medicine can be further prevented from entering the internal structure of the repeated injection pen.

[0067] In an embodiment of the present application, please refer to Figure 8 , the push rod drive 300 is provided with a threaded hole 303, the threaded hole 303 is arranged along the axial direction of the push rod drive 300, and the first push rod 400 has an external thread, and the external thread is in threaded transmission connection with 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 likely to loosen. The first push rod 400 is equipped with an external thread, which enables the first push rod 400 to be threadedly connected to the threaded hole 303 on the push rod drive 300. When the first push rod 400 is rotated, the interaction between its external thread and the threaded hole 303 causes 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 is very convenient to operate, greatly improving the work efficiency.

[0069] In one embodiment of the present application, please refer to Figure 4 , the outer wall of the fixing plug 100 is provided with a threaded structure 103 for threaded connection with the medicine chamber.

[0070] The working principle of a driving assembly provided in this embodiment: When the medicine bottle containing the liquid medicine accidentally breaks, the liquid medicine in the medicine bottle will flow out. To prevent the liquid medicine from flowing into the pen body, through the cooperation of the sealing pad 200 with the first drainage hole 202, the second drainage hole 203, and the blocking structure 201, and the fixing plug 100 with the water outlet hole 101, the infiltration of the liquid medicine can be prevented; the blocking structure 201 on the rubber pad 3 is circumferentially closed with the end of the medicine bottle to prevent the liquid medicine leaking from the inner end of the medicine bottle from flowing into the inside of the reusable injection pen through the through hole 206 of the rubber pad, that is, into the pen core, so that the leaked liquid medicine can only flow to the first drainage hole 202 of the rubber pad 3; because the first drainage hole 202, the second drainage hole 203, and the water outlet hole 101 are interconnected; when the liquid medicine flows into the first drainage hole 202 of the sealing pad 200, it will flow out through the interconnected water outlet hole 101 of the fixing plug 100, so that the leaked liquid medicine flows out of the reusable injection pen, thereby improving the economy and the reusability of the reusable injection pen.

[0071] The present application also provides a reusable injection pen. Please refer to Figure 9 and Figure 10, the reusable injection pen includes a housing 500, a plunger barrel 600, a transmission mechanism, a tail handle 802, a second plunger 901, and the above-mentioned drive assembly; one end of the fixed plug 100 is snap-fitted inside the housing 500; the plunger barrel 600 is cylindrical, one end of the plunger barrel 600 is the drive end, and the other end of the plunger barrel 600 is inserted into the housing 500; the transmission mechanism includes a connecting cylinder 902, a first barrel gear 903, and a second barrel gear 904 arranged in sequence along the direction from the drive end to the other end of the plunger barrel 600, and the second barrel gear 904 is in meshing transmission with the plunger barrel 600; the tail handle 802 is connected to the first end of the connecting cylinder 902, and the tail handle 802 can rotate relative to the connecting cylinder 902; the second plunger 901 is slidably connected to the first barrel gear 903 along its axis, and the end face of the second plunger 901 has a gear portion 911; wherein, on the side of the plunger driver 300 facing away from the gasket, there is a first plunger gear 801, the first plunger is slidably connected to the first plunger gear 801 along its axis, after the medicine bottle is installed, the gear portion 911 of the second plunger meshes with the first plunger gear 801, and during injection, the gear portion 911 of the second plunger 901 drives the first plunger gear 801 to rotate, thereby driving the first plunger 400 to move.

[0072] In this embodiment, please refer to Figure 10 , the reusable injection pen further includes a tail cap 610 and a dose member 620. The dose member 620 is used to adjust the dose of the delivered medicine and display the counted quantity. Among them, as Figure 11 shown, there is a receiving hole 601 provided on the drive end of the plunger barrel 600, one end of the dose member 620 is the insertion end, the insertion end of the dose member 620 is sleeved on the plunger barrel 600 from the other end of the plunger barrel 600, and the insertion end is inserted into the receiving hole 601. In order to further improve the fixing effect of the device, the tail cap 610 is arranged in the receiving hole 601, and a snap-fit structure is arranged between the plunger barrel 600, the tail cap 610, and the dose member 620. Specifically, this snap-fit structure is used to fix the plunger barrel 600, the tail cap 610, and the dose member 620. Specifically, by arranging a snap-fit structure between the plunger barrel 600, the tail cap 610, and the dose member 620, the three parts of the plunger barrel 600, the tail cap 610, and the dose member 620 can be snap-fitted with each other, so that the three parts cannot move axially or rotate relative to each other. Moreover, by sleeving the dose member 620 on the plunger barrel 600 and arranging the tail cap 610 in the receiving hole 601 of the plunger barrel 600, the volume of the device can be reduced and the portability of the device can be improved.

[0073] Specifically, when assembling the repeat injection pen, first, the insertion end of the dose member 620 is sleeved on the push rod cylinder 600 from one end of the push rod cylinder 600 away from the driving end, and the insertion end is passed through the receiving hole 601 of the push rod cylinder 600. Subsequently, the tail cap 610 is arranged in the receiving hole 601, and the driving mechanism is fixed by using the clamping structure arranged between the push rod cylinder 600, the tail cap 610 and the dose member 620. By using the clamping structure to fix the driving mechanism, it is convenient to fix the three, reduce the production cost of the device, and adopting this fixing method can improve the quality of the device, thereby improving the yield rate of the product and extending the service life of the product.

[0074] In this embodiment, a limiting portion is arranged between the push rod cylinder 600 and the tail cap 610. The limiting portion is used to fixedly connect the tail cap 610 and the driving member 2 to prevent the tail cap 610 from detaching from the push rod cylinder 600 and / or the tail cap 610 from rotating relative to the push rod cylinder 600.

[0075] As Figure 10 and Figure 12 shown, the repeat injection pen further includes a cylinder bracket 700. The cylinder bracket 700 is fixedly arranged in the receiving cavity of the outer shell. The push rod cylinder 600 is movably arranged in the cylinder bracket 700, and the dose member 620 is located outside the cylinder bracket 700. Such an arrangement facilitates observing the scale on the dose member 620. In this embodiment, one end of the cylinder bracket 700 is fixedly connected to the housing and is located inside the housing, and the other end of the cylinder bracket 700 is located inside the dose member 620. Among them, the cylinder bracket 700 is threadedly connected to the push rod cylinder 600. To improve the connection stability of the device, a limiting structure is arranged between the cylinder bracket 700 and the push rod cylinder 600. The limiting structure is used to limit the push rod cylinder 600 from disengaging from the cylinder bracket 700. Specifically, by arranging the limiting structure, when adjusting the dose through the push rod cylinder 600 and when adjusting to the maximum dose of the device, the limiting structure can prevent the push rod cylinder 600 from disengaging from the cylinder bracket 700.

[0076] Specifically, both the push rod cylinder 600 and the cylinder bracket 700 are provided with threaded structures. A limiting boss is arranged on the threaded structure of the push rod cylinder 600, and a limiting groove is arranged on the threaded structure of the cylinder bracket 700. The limiting boss and the limiting groove form a limiting structure, and the limiting boss and the limiting groove cooperate to prevent the push rod cylinder 600 from disengaging from the cylinder bracket 700. Among them, in this embodiment, by disconnecting a part of the threaded structure on the cylinder bracket 700, the disconnection part of the threaded structure forms a limiting groove.

[0077] Specifically, the limiting boss is located at one end of the push rod cylinder 600 away from the driving end. Correspondingly, the limiting groove is located at one end of the cylinder bracket 700 close to the push rod cylinder 600, and both the limiting boss and the limiting groove are arranged at the thread cut-off of the thread structure. To facilitate the assembly of the push rod cylinder 600 and the cylinder bracket 700, an opening is provided at the end of the push rod cylinder 600 away from the driving 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. Among them, the end face of the limiting boss close to the opening is parallel to the opening, the end face of the limiting boss away from the opening is an inclined surface, and the end of the limiting groove is chamfered.

[0078] When assembling the push rod cylinder 600 and the cylinder bracket 700, the limiting boss of the push rod cylinder 600 first contacts the limiting groove of the cylinder bracket 700. Specifically, the side of the limiting boss with the inclined surface first contacts the limiting groove. Then, press the opening of the push rod cylinder 600 to deform the end of the push rod cylinder 600, so as to install the push rod cylinder 600 into the cylinder bracket 700, and prevent the push rod cylinder 600 from slipping out of the cylinder bracket 700 through the cooperation of the limiting boss and the limiting groove. Moreover, by providing an inclined surface on the limiting boss and chamfering the end of the limiting groove, it is convenient to assemble the push rod cylinder 600 and the cylinder bracket 700.

[0079] In this embodiment, please refer to Figure 15 , the first end face of the first cylinder gear 903 and the second cylinder gear 904 is engaged by gears. A step is provided on the inner wall of the push rod cylinder 600 away from the driving end. A gear is provided on the side of the step facing the tail handle 802. The second end face of the second cylinder gear 904 is engaged with the gear. The first cylinder gear 903, the second cylinder gear 904 and the connecting cylinder 902 can all axially move relative to the push rod cylinder 600. Among them, the inner surface of the first cylinder gear 903 has a second limiting rib. As Figure 13 shown, the outer surface of the second push rod 901 has a second limiting groove 912. Through the cooperation of the second limiting rib and the second limiting groove 912, the first cylinder gear 903 can only axially move relative to the second push rod 901 and cannot rotate relatively. With the above structure, when a set dose is rotated, by pressing the push rod cylinder 600, the first cylinder gear 903, the second cylinder gear 904 and the connecting cylinder 902 do not move axially relative to each other, but rotate simultaneously. Furthermore, the first cylinder gear 903 drives the second push rod 901 to rotate simultaneously, ensuring the transmission of power and thus completing the injection operation.

[0080] In this embodiment, please refer to Figure 15 and Figure 16, the repeated injection pen further includes a third barrel gear 905 and a second push rod gear 906. Among them, the third barrel gear 905 and the second push rod gear 906 are engaged through gears, and the first push rod gear 801 and the second push rod 901 are engaged through gears.

[0081] In this embodiment, as Figure 13 and Figure 16 shown, a step portion 913 is provided at one end of the second push rod 901 close to the gear portion 911. A middle spring 907 is provided between the step portion 913 and the second push rod gear 906. Under the action of the elastic force of the middle spring 907, the second push rod gear 906 and the third barrel gear 905 are in an engaged state. And, a small spring 821 is provided between the tail handle 802 and the connecting cylinder 902. Through the above structure, when the syringe is adjusted forward to increase the scale, the push rod barrel 600 will rotate relative to the second barrel gear 904; when the syringe is adjusted backward to decrease the scale, the first barrel gear 903 will rotate relative to the second barrel gear 904. However, since the torsion generated by the jumping of the small spring 821 is less than the torsion that separates the third barrel gear 905 and the second push rod gear 906 from the engaged state, no injection effect will be produced regardless of the forward or backward adjustment operation.

[0082] As Figure 14 shown, a connecting hole 811 is provided on the first push rod gear 801. The connecting hole 811 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. Through the cooperation of the first limiting rib 812 and the first limiting groove 402, and 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 arranged on the fixed plug 100, and an internal thread is provided on the inner wall of the push rod drive 300, and an external thread is provided on the outer surface of the first push rod 400. Since the push rod drive 300 and the first push rod 400 are in a threaded fit, when the first push rod 400 rotates, the first push rod 400 will move axially relative to the push rod drive 300, thereby realizing the injection or reset operation. And, in order to improve the pushing effect of the first push rod 400 on the drug, a piston is provided at one end of the first push rod 400 away from the driving member.

[0084] In this embodiment, after the medicine bottle is placed into the medicine chamber, the medicine chamber is arranged on the fixing plug 100 in a threaded connection manner. One side of the medicine bottle close to the fixing plug 100 will contact the push rod drive 300 and apply an axial force to the push rod drive 300, causing the first push rod gear 801 to engage with the second push rod 901. Moreover, since a large spring 951 is arranged between the push rod drive 300 and the third rotating cylinder gear 905 (as shown in Figure 15 ), when the medicine chamber is detached from the fixing plug 100, the first push rod gear 801 will displace relative to the second push rod 901 under the action of the elastic force of the large spring 951. At this time, the first push rod gear 801 is not in an engaged state with the second push rod 901.

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

[0086] (1) Injection process

[0087] Push the tail handle 802 by hand. The tail handle 802 transmits the axial force to the push rod rotating cylinder 600 through the connecting cylinder 902, the first rotating cylinder gear 903, and the second rotating cylinder gear 904. And since the push rod rotating cylinder 600 and the rotating cylinder bracket 700 are in threaded connection, the push rod rotating cylinder 600 will rotate under the action of the axial thrust. When the push rod rotating cylinder 600 rotates, since the push rod rotating cylinder 600, the first rotating cylinder gear 903, and the second rotating cylinder gear 904 are all in gear engagement, the push rod rotating cylinder 600 will drive the second rotating cylinder gear 904 to rotate, and the second rotating cylinder gear 904 will drive the first rotating cylinder gear 903 to rotate. Moreover, due to the cooperation between the second limiting rib and the second limiting groove 912, the second push rod 901 will rotate. Since the first push rod gear 801 and the second push rod 901 are in gear engagement at this time, the first push rod gear 801 will also rotate. Through the cooperation between the first limiting rib 812 and the first limiting groove 402, the first push rod 400 will rotate along with the first push rod gear 801. And since the push rod drive 300 and the first push rod 400 are in threaded fit, the first push rod 400 will axially move relative to the push rod drive 300, thereby achieving the injection effect.

[0088] (2) Reset process

[0089] Rotate the medicine chamber to detach the medicine chamber from the fixing plug 100. Under the action of the elastic force of the large spring 951, the first push rod gear 801 will displace relative to the second push rod 901. At this time, the first push rod gear 801 is not in an engaged state with the second push rod 901. Push the first push rod 400 to make the first push rod 400 rotate under the action of the thrust. And since the first push rod gear 801 is not in an engaged state with the second push rod 901, while the first push rod 400 rotates and axially moves, the second push rod 901 will remain stationary. Continuously push the first push rod 400 until it returns to the initial state, that is, the reset is completed.

[0090] (3) Callback process

[0091] The scale is reduced by rotating the push rod cylinder 600 counterclockwise. At this time, the push rod cylinder 600 and the second cylinder gear 904 are relatively stationary, and the first cylinder gear 903 will rotate 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, and the torque generated by the jumping of the small spring 821 is smaller than the torque that separates the third cylinder gear 905 and the second push rod gear 906 from the meshing state, so no injection effect will be produced during the callback process.

[0092] (4) Adjustment process

[0093] The scale is increased by rotating the push rod cylinder 600 clockwise. At this time, the first cylinder gear 903 and the second cylinder gear 904 are relatively stationary, and the push rod cylinder 600 will rotate 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, and the torque generated by the jumping of the small spring 821 is smaller than the torque that separates the third cylinder gear 905 and the second push rod gear 906 from the meshing state, so no injection effect will be produced during the adjustment process.

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

Claims

1. A driving component for a repeat injection pen, characterized in that, Comprising: A fixed plug, the fixed plug is cylindrical, and the side wall of the fixed plug is provided with a water outlet hole; A gasket, the gasket is disc-shaped, the gasket is arranged inside the fixed plug, and the outer side wall of the gasket fits with the inner side wall of the fixed plug; a first drainage hole is provided on the first end face of the gasket; a second drainage hole is provided on the outer side wall of the gasket, the second drainage hole communicates with the first drainage hole and communicates with the water outlet hole, and the first end face of the 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 arranged inside the fixed plug, and the outer side wall of the push rod drive is fitted and installed with the inner side wall of the fixed plug, and the push rod drive is clamped with the second end face of the gasket; And A first push rod, a through hole is provided on the gasket, one end of the first push rod passes through the through hole of the gasket and is connected to the push rod drive, and the push rod drive is used to drive the first push rod to move.

2. The drive assembly according to claim 1, characterized in that A blocking structure is provided on the first end face of the gasket for blocking the through hole and the first drainage hole to prevent the liquid medicine from flowing into the second end face of the gasket through the first push rod.

3. The drive assembly according to claim 2, characterized in that, The blocking structure protrudes from the first end face of the gasket, and the blocking structure is annular; the first drainage hole is located outside the blocking structure.

4. The drive assembly according to claim 1, characterized in that, The diameter of the through hole is equal to the outer diameter of the first push rod.

5. The drive assembly according to claim 1, characterized in that, The first push rod is a screw rod, and the through hole is in threaded transmission connection with the first push rod.

6. The drive assembly according to claim 1, wherein A plurality of guide posts are provided on the inner wall of the fixed plug, and the guide posts are arranged along the axial direction of the fixed plug; a plurality of guide groove notches are provided on the circumferential direction of the push rod drive, and the guide posts are slidably connected with the guide groove notches and terminate at the circumferential surface of the push rod drive for realizing 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 repeated injection pen.

7. The drive assembly according to claim 6, wherein A first boss and a second boss are provided on the second end face of the gasket, 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 are cooperatively sealed; the second boss and the second notch are cooperatively sealed to realize the clamping connection between the push rod drive and the second end face of the gasket.

8. The drive assembly according to claim 1, characterized in that, A threaded hole is provided on the push rod drive, and 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 in threaded transmission connection with the threaded hole.

9. The drive assembly according to any one of claims 1-8, characterized in that, A threaded structure is provided on the outer wall of the fixed plug, and the threaded structure is used for threaded connection with the medicine chamber.

10. A repeat injection pen, characterized in that, Comprising: The driving assembly according to any one of claims 1-9, A housing, one end of the fixed plug is clamped in the housing; A push rod rotating cylinder, the push rod rotating cylinder is cylindrical, one end of the push rod rotating cylinder is a driving end, and the other end of the push rod rotating cylinder is inserted into the housing; A transmission mechanism, the transmission mechanism includes a connecting cylinder, a first rotating cylinder gear and a second rotating cylinder gear arranged in sequence along the direction from the driving end to the other end of the push rod rotating cylinder, and the second rotating cylinder gear is in meshing transmission with the push rod rotating cylinder; A tail handle, the tail handle is connected to the first end of the connecting cylinder, and the tail handle can rotate relative to the connecting cylinder; And A second push rod, the second push rod is slidably connected to the first rotating cylinder gear along its axial direction, and a gear portion is provided on the end face of the second push rod; Wherein, a first push rod gear is provided on the side of the push rod drive away from the 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 portion of the second push rod meshes with the first push rod gear, and during injection, the gear portion 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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