Injection device

Abstract

The utility model relates to the technical field of medical instruments, and provides an injection device which comprises a shell suitable for containing a medicine cylinder. The adjusting mechanism comprises a limiting part, a driving part, a rotating part and a pressing part; the rotating part can move in the axial direction of the shell, the driving part is arranged in the rotating part, and the limiting part is in threaded connection to the driving part; double-layer ratchets are arranged on the driving part, the first ratchets rotate relative to the rotating part to give out positive adjusting sound, and the second ratchets rotate relative to the driving part to give out negative adjusting sound; the injection mechanism is arranged in the shell and used for moving in the axial direction of the shell in the rotating process. The injection device provided by the utility model is provided with the double-layer ratchets which are respectively corresponding to the positive adjusting sound and the negative adjusting sound. When the adjusting mechanism is rotated to adjust the dosage, the double-layer ratchets can send out different sound signals, and therefore the adjusting direction and measuring degree can be clearly indicated. By means of the design, operation convenience and accuracy are improved, and operation risks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an injection device. Background Art

[0002] In the medical field, especially in injection drug delivery technology, injection devices are key tools for disease treatment. However, traditional injection devices often lack intuitive feedback mechanisms when adjusting the dosage of drugs, making it difficult to accurately judge the adjustment amount during operation, which in turn affects the treatment effect.

[0003] Specifically, when the dosage needs to be fine-tuned, repeated attempts and adjustments are usually required, which not only increases the operation time but also reduces work efficiency. More importantly, due to the lack of clear feedback signals, it is often difficult to accurately perceive the increase or decrease in the dosage, which may lead to overdose or underdose, thus affecting the treatment effect. Utility Model Content

[0004] The utility model provides an injection device to solve the problem that the existing injection lacks a clear feedback signal and is often difficult to accurately sense the increase or decrease of the drug dosage, which may lead to an overdose or underdose of the drug, thereby affecting the treatment effect.

[0005] The utility model provides an injection device, comprising:

[0006] a housing adapted to accommodate the cartridge;

[0007] The adjusting mechanism comprises a limiting part, a driving part, a rotating part and a pressing part; the rotating part can move along the axial direction of the shell, the driving part is arranged in the rotating part, and the limiting part is threadedly connected to the driving part; the pressing part is used to control the driving part to switch between the adjusting station and the injection station; the driving part is provided with a double-layer ratchet, one side of the double-layer ratchet is provided with a first ratchet, and the other side is provided with a second ratchet, the first ratchet rotates relative to the rotating part to emit a positive adjustment sound, and the second ratchet rotates relative to the driving part to emit a negative adjustment sound;

[0008] The injection mechanism is arranged in the shell and is used for moving along the axial direction of the shell during the rotation process.

[0009] The injection device provided by the utility model further comprises: an adapting mechanism, which is arranged in the housing and is suitable for fixing cartridges of different diameters and / or lengths.

[0010] According to the injection device provided by the utility model, the adapting mechanism comprises: an elastic grasping structure;

[0011] The elastic gripping structure is arranged in the housing and is used for gripping cartridges of different diameters.

[0012] According to the injection device provided by the utility model, the adapting mechanism comprises: a sliding nut and an elastic movable structure;

[0013] The sliding nut is movable along the axial direction of the shell, and the elastic movable structure is used to abut between the platform extending inwardly of the shell and the sliding nut to cooperate with the sliding nut and the side wall of the shell to fix cartridges of different lengths.

[0014] According to the injection device provided by the utility model, the elastic movable structure comprises: a mounting seat and an elastic member;

[0015] A second protrusion that is engaged with the sliding nut is formed on one side of the mounting seat so that the mounting seat is fixed on the sliding nut; the elastic member is connected to the other side of the mounting seat for abutting against the shell.

[0016] According to the injection device provided by the utility model, the driving part includes: a limiting screw and a driving rod; the rotating part includes a graduated cylinder;

[0017] The scale barrel is arranged on the housing, the limit screw is arranged in the scale barrel, the drive rod is arranged in the limit screw, the drive rod is slidable along the axial direction of the limit screw, and one end of the injection mechanism is arranged in the drive rod;

[0018] A first clutch tooth is provided at one end of the limit screw, and a second clutch tooth adapted to the first clutch tooth is provided on the scale cylinder. The pressing portion is suitable for adjusting the limit screw by pressing, so as to combine the limit screw and the scale cylinder through the first clutch tooth and the second clutch tooth, or to disengage the first clutch tooth from the second clutch tooth.

[0019] According to the injection device provided by the utility model, a limiting ratchet is provided at one end of the driving rod, a notch adapted to the driving rod is formed on the mounting seat, a first tooth groove matched with the limiting ratchet is formed on the sliding nut, the driving rod passes through the notch and is arranged in the first tooth groove, and the mounting seat cooperates with the first tooth groove to fix the driving rod axially along the shell.

[0020] According to the injection device provided by the utility model, the injection mechanism includes a pressing block and a piston rod;

[0021] One end of the piston rod is arranged in the driving rod and is transmission-connected with the driving rod. The other end of the piston rod passes through the notch and the sliding nut and is connected with the pressing block, and the piston rod is threadedly connected with the sliding nut.

[0022] According to the injection device provided by the utility model, the graduated cylinder is provided with a second tooth groove, and the limiting screw is provided with a third tooth groove;

[0023] The injection device further comprises: a double-layer ratchet;

[0024] The double-layer ratchet is arranged on the limiting screw, one side of the double-layer ratchet extends to cooperate with the second tooth groove, and the other side of the double-layer ratchet extends to cooperate with the third tooth groove.

[0025] According to the injection device provided by the utility model, the housing comprises: a pen cap, a pen core barrel, a pen body and a nut bushing;

[0026] The core barrel is connected to the pen body, the pen cap is sleeved on the core barrel, the core barrel is used to accommodate a medicine cartridge, the nut bushing is arranged in the pen body, and the nut bushing is threadedly connected to the scale barrel.

[0027] The utility model provides an injection device, which is provided with double-layer ratchets, which correspond to positive adjustment sounds and negative adjustment sounds respectively. When the adjustment mechanism is rotated to adjust the dosage of the medicine, the double-layer ratchets will emit different sound signals, thereby clearly indicating the direction and amount of adjustment. This design not only improves the convenience and accuracy of operation, but also reduces the operation risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of the injection device provided by the utility model;

[0030] Figure 2 It is a schematic diagram of the internal structure of the injection device provided by the utility model;

[0031] Figure 3 It is a disassembly schematic diagram of the injection device provided by the utility model;

[0032] Figure 4 It is a structural schematic diagram of the elastic grabbing structure provided by the utility model;

[0033] Figure 5 This is one of the installation schematic diagrams of the elastic movable structure provided by the utility model;

[0034] Figure 6This is one of the installation schematic diagrams of the elastic grabbing structure provided by the utility model;

[0035] Figure 7 This is the second installation diagram of the elastic grabbing structure provided by the utility model;

[0036] Figure 8 This is the second installation diagram of the elastic movable structure provided by the utility model;

[0037] Fig. 9 This is the third installation diagram of the elastic movable structure provided by the utility model;

[0038] Fig.10 It is a schematic diagram of the pressing part provided by the utility model being arranged on the driving part;

[0039] Fig.11 It is a schematic diagram of the installation of the nut bushing provided by the utility model;

[0040] Fig.12 It is a schematic diagram of the limit ring provided by the utility model;

[0041] Fig.13 It is a schematic diagram of a double-layer ratchet provided by the utility model;

[0042] Reference numerals:

[0043] 1. Shell; 11. Nut bushing; 12. Pen cap; 13. Core barrel; 14. Pen body;

[0044] 2. Adaptation mechanism; 21. Elastic grasping structure; 211. Clamping claw; 212. Ring member; 213. First protrusion; 22. Elastic movable structure; 221. Mounting seat; 222. Elastic member; 223. Second protrusion; 23. Sliding nut;

[0045] 3. Adjustment mechanism; 31. Limit screw; 32. Drive rod; 321. Limit ratchet; 33. Scale cylinder; 34. Button; 35. Double ratchet; 351. First ratchet; 352. Second ratchet; 36. Limit ring; 361. Gear; 362. Keyway;

[0046] 4. Injection mechanism; 41. Pressing block; 42. Piston rod;

[0047] 5. Cartridge. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] Combine the following Figures 1 to 13 The invention describes an injection device provided by the utility model.

[0050] like Figure 1 , Figure 2 and Fig.13 As shown, the injection device provided by the embodiment of the utility model includes: a housing 1, an adjustment mechanism 3 and an injection mechanism 4.

[0051] In this embodiment, the housing 1 is suitable for accommodating the cartridge 5 , providing a stable and safe storage space for the cartridge 5 .

[0052] The adjustment mechanism 3 includes a limiting part, a driving part, a rotating part and a pressing part. The rotating part is threadedly connected to the shell 1, and the rotating part can move along the axial direction of the shell 1. The driving part is arranged in the rotating part, and the limiting part is arranged between the driving part and the rotating part. The limiting part is threadedly connected to the driving part; such a design enables the adjustment mechanism 3 to accurately adjust the amount of medicine. The pressing part serves as an interactive component between the user and the adjustment mechanism, and the pressing part is arranged on the driving part. The user can control the driving part to switch between the adjustment position and the injection position through the pressing part. At the adjustment position, the user can conveniently adjust the required amount of medicine; and at the injection position, the device can accurately complete the injection operation. The injection mechanism 4 is arranged in the shell 1, and is used to move along the axial direction of the shell 1 during rotation.

[0053] The driving part is provided with a double-layer ratchet 35, which is an innovative feature of the device. A first ratchet 351 is provided on one side of the double-layer ratchet 35, and a second ratchet 352 is provided on the other side. When the first ratchet 351 rotates relative to the rotating part, a positive adjustment sound is emitted, prompting the user that the dosage is being increased; and when the second ratchet 352 rotates relative to the driving part, a negative adjustment sound is emitted, prompting the user that the dosage is being reduced. This design not only provides intuitive auditory feedback, but also improves the accuracy of the operation.

[0054] When the adjustment mechanism 3 is switched to the injection position, the user can press the adjustment mechanism 3 to move the injection mechanism 4 forward, thereby pushing the medicine in the cartridge 5 for injection.

[0055] In the case of the adjustment position, the user rotates the adjustment mechanism 3, and the relative rotation of the double-layer ratchet 35 and the adjustment mechanism 3 will emit a corresponding sound prompt. At the same time, due to the connection between the adjustment mechanism 3 and the cartridge 5, the rotation of the adjustment mechanism 3 will also drive the piston of the cartridge 5 to move accordingly, so as to memorize the adjustment amount of the medicine. In this way, the user can accurately adjust the dosage according to the needs and confirm the adjustment result through auditory feedback.

[0056] In the case of the injection position, the user presses the adjustment mechanism 3 to drive the injection mechanism 4 to move along the axial direction of the housing 1, thereby pushing the medicine in the cartridge 5 for injection. At this time, since the adjustment mechanism 3 has been locked in the injection position, it will no longer rotate, and the double-layer ratchet 35 will no longer emit a sound prompt.

[0057] In this embodiment, Figure 1 and Figure 2 As shown, in the case of the adjustment position, the rotating part is rotated out relative to the accommodating chamber, and the limiting part moves along the axial direction of the driving part to memorize the adjusted amount of the medicine in the cartridge to ensure that the preset dose can be accurately reached during the next injection. In the case of the injection position, the driving part is connected to the rotating part in transmission, the pressing part drives the rotating part to cooperate with the driving part to rotate toward the accommodating chamber, and the driving part rotates to drive the injection mechanism 4 to complete the injection.

[0058] Specifically, the process of using the injection device is divided into a dose setting stage and a drug injection stage.

[0059] During the dose phase:

[0060] If the dosage of the medicine needs to be increased, the user can rotate the rotating part forward. At this time, the rotating part extends out of the accommodating cavity under the drive of the thread. At this time, the driving part does not rotate, and the limiting part moves along the axial direction of the driving part under the drive of the rotating part to increase the adjustment amount of the medicine in the cartridge.

[0061] If the dosage of the medicine needs to be reduced, the user can rotate the rotating part in the opposite direction. At this time, the rotating part moves into the accommodating chamber under the drive of the thread. At this time, the driving part does not rotate, and the limiting part moves along the axial direction of the driving part under the drive of the rotating part to reduce the adjustment amount of the medicine in the cartridge.

[0062] During the injection phase:

[0063] After the dose adjustment is completed, the pressing part can be pressed. At this time, the driving part is connected with the rotating part by transmission. At this time, the rotating part and the driving part are as a whole. Under the action of the thread, the rotating part cooperates with the driving part to screw into the accommodating cavity. The driving part is connected with the injection mechanism by transmission. The driving part rotates to drive the injection mechanism, and the injection mechanism squeezes the cartridge 5 to complete the injection.

[0064] In some embodiments, Figure 1 and Figure 2 As shown, the injection device is further provided with an adaptor 2. The adaptor 2 is arranged in the housing 1, and is suitable for fixing cartridges 5 of different diameters and / or lengths. The adaptor 2 has excellent adaptability and can fix cartridges of different diameters and lengths. Regardless of how the specifications of the cartridge change, the adaptor 2 can ensure that it is firmly fixed in the device, thereby avoiding possible sliding or shaking during the injection process.

[0065] The injection device provided in the embodiment of the utility model can adapt to cartridges of different diameters and lengths by setting an adapter mechanism, without the need to frequently replace or adjust the device, thereby greatly improving the convenience and efficiency of use. Secondly, the adapter mechanism can effectively fix the cartridge to ensure its stability and accuracy during the injection process. Through precise fixation, the cartridge is prevented from sliding or loosening during the injection process, ensuring that the drug can be injected into the human body according to the predetermined dose and speed, thereby improving the reliability and safety of the treatment.

[0066] In some embodiments, Figures 2 to 5 As shown, the adapting mechanism 2 includes an elastic gripping structure 21; the elastic gripping structure 21 is disposed in the housing 1, and is used to grip cartridges 5 of different diameters. Since the diameters of the cartridges may vary, the elastic gripping structure 21 must have sufficient elasticity and adaptability to ensure that the cartridges of different diameters can be tightly gripped and fixed.

[0067] In actual application, when the cartridge 5 needs to be placed, the user can put the cartridge 5 into the housing 1, and the elastic gripping structure 21 will automatically adjust its shape and size according to the diameter of the cartridge 5 to ensure that it can tightly wrap the cartridge 5. This adaptive gripping method is not only convenient and fast, but also can ensure that the cartridge 5 will not loosen or fall off during use.

[0068] Based on the above embodiments, in some examples, such as Figure 3 and Figure 4As shown, the elastic gripping structure 21 includes: a plurality of clamping jaws 211 and an annular member 212. A first protrusion 213 is formed on the annular member 212 to be engaged with the housing 1, so that the annular member 212 is fixed on the side wall of the housing 1. This design enables the annular member 212 to be firmly fixed on the side wall of the housing 1, ensuring that it will not loosen or move during the fixing and injection of the cartridge 5. A plurality of clamping jaws 211 are arranged on the annular member 212 in an annular manner to form a clamping space for grabbing and fixing the cartridge 5. The size and shape of this clamping space can be adaptively adjusted according to the diameter of the cartridge 5. The clamping jaws 211 are made of elastic material and have good elasticity and gripping force. When the cartridge 5 is placed in the clamping space, the clamping jaws 211 can adaptively fit the outer wall of the cartridge 5 and firmly fix it by the gripping force.

[0069] The number of the clamping jaws 211 can be adjusted as required, and is generally not less than 2. Preferably, the clamping jaws 211 can be set to three, and three clamping jaws 211 can be used for fixing, or four clamping jaws 211 can be used for fixing.

[0070] In actual use, after the cartridge 5 is placed in the clamping space, the elastic gripping structure 21 can be used to adjust the clamping space to match the diameter of the cartridge 5. The clamping jaws 211 will automatically grab and fix the cartridge 5. This design not only simplifies the fixing process of the cartridge, but also improves the stability and reliability of the fixation.

[0071] In addition, since the clamping jaws 211 are made of elastic material, they can adapt to cartridges 5 of different diameters, making the injection device more widely applicable. Whether the cartridge 5 is large or small in diameter, it can be firmly fixed by adjusting the extension degree of the clamping jaws 211.

[0072] It should be noted that each clamping jaw 211 can also be tilted on the annular member 212, and the clamp between the clamping jaw 211 and the annular member 212 can be set to 70 to 85 degrees, so that the inner diameter of the end of the clamping space close to the cartridge 5 is smaller than the outer diameter of the cartridge 5, and the inner diameter of the end of the clamping space away from the cartridge 5 is greater than or equal to the outer diameter of the cartridge 5. At this time, when the cartridge 5 is loaded, the elastic gripping structure 21 can be tightly matched with the cartridge 5, thereby fixing the cartridge 5 and solving the problem of being unable to adapt to cartridges 5 of different specifications.

[0073] In summary, with the elastic gripping structure 21 provided in this embodiment, in actual application, the user only needs to insert the cartridge 5 into the clamping space, and no additional fixing operation is required, so that the cartridge 5 can be easily fixed.

[0074] In some embodiments, Figures 2 to 5As shown, the adapting mechanism 2 includes: a sliding nut 23 and an elastic movable structure 22. The sliding nut 23 is movable along the axial direction of the housing 1, and the elastic movable structure 22 is arranged on the side of the sliding nut 23 away from the cartridge 5. The elastic movable structure 22 is used to abut between the platform extending inwardly of the housing 1 and the sliding nut, so as to cooperate with the sliding nut 23 and the side wall of the housing 1 to fix cartridges 5 of different lengths.

[0075] In this embodiment, the sliding nut 23 is a basic component of the adapting mechanism, and it is movable along the axial direction of the housing 1. This design enables the sliding nut 23 to be flexibly adjusted according to the length and position of the cartridge, thereby ensuring that the cartridge 5 can be firmly fixed in the housing 1.

[0076] The elastic movable structure 22 is arranged on the side of the sliding nut 23 away from the cartridge 5. This structure is made of elastic material and can flexibly abut between the platform extending inwardly of the housing 1 and the sliding nut 23. When the sliding nut 23 moves axially, the elastic movable structure 22 will deform accordingly and generate a certain elastic force. This elastic force provides an acting force between the sliding nut 23 and the cartridge 5, and can fix cartridges 5 of different lengths. Whether it is a long cartridge or a short cartridge, a stable fixation can be achieved by adjusting the position of the sliding nut 23 and the elastic force of the elastic movable structure 22.

[0077] Based on the above embodiments, in some embodiments, such as Figures 3 to 5 As shown, the elastic movable structure 22 includes: a mounting seat 221 and an elastic member 222. A second protrusion 223 engaged with the sliding nut 23 is formed on one side of the mounting seat 221 to fix the mounting seat 221 on the sliding nut 23; and an elastic member 222 is connected to the other side of the mounting seat 221 for abutting against the housing 1.

[0078] Specifically, the elastic movable structure 22 mainly includes two core components, a mounting seat 221 and an elastic member 222. The mounting seat 221 is a basic component for fixing and connecting, and its design fully considers the compatibility with the sliding nut 23. A second protrusion 223 is formed on one side of the mounting seat 221 to engage with the sliding nut 23. This design enables the mounting seat 221 to be firmly fixed on the sliding nut 23, ensuring that it will not loosen or move during the process of fixing and injecting the cartridge.

[0079] Among them, the second protrusion 223 can be any shape of a triangle, a quadrilateral or a polygon, preferably a triangle. The base of the triangle can be stuck by the groove part on the edge side of the sliding nut 23, which is not easy to slip and is conducive to assembly.

[0080] The elastic member 222 connected to the mounting seat 221 is another key component of the elastic movable structure 22. The elastic member 222 is made of a material with excellent elasticity, such as rubber or spring steel, to ensure that it can generate sufficient deformation and elastic force when subjected to external force. On the other side of the mounting seat 221, the elastic member 222 is cleverly connected to abut against the shell 1. This design enables the elastic member 222 to interact with the platform extending inwardly of the shell 1 when the sliding nut 23 moves axially, and helps to fix cartridges of different lengths through its elastic force.

[0081] In practical applications, when it is necessary to fix cartridges of different lengths, the user can change the distance between the elastic movable structure 22 and the platform extending inwardly of the housing 1 by adjusting the position of the sliding nut 23. As the sliding nut 23 moves, the elastic member 222 is compressed or stretched to varying degrees, thereby generating corresponding elastic force. This elastic force acts on the sliding nut 23 and the cartridge 5, so that the cartridge can be firmly fixed in the housing 1.

[0082] It should be noted that the elastic movable structure 22 can be a single component or a combination of two or more components. When the elastic movable structure 22 is a single component, it can be a plastic elastic body; when it is two components, it can be a combination of a mounting seat 221 and an elastic member 222 .

[0083] In one embodiment, Figures 1 to 10 As shown, the driving part includes: a limit screw 31 and a driving rod 32. The rotating part includes a scale barrel 33. The scale barrel 33 is arranged on the housing 1, and the scale barrel 33 is threadedly connected to the side wall of the housing 1. The limit screw 31 is arranged in the scale barrel 33, and the driving rod 32 is arranged in the limit screw 31. The driving rod 32 is slidable along the axial direction of the limit screw 31, and one end of the injection mechanism 4 is arranged in the driving rod 32; one end of the limit screw 31 is provided with a first clutch tooth, and the scale barrel 33 is provided with a second clutch tooth adapted to the first clutch tooth. The pressing part is suitable for adjusting the limit screw 31 by pressing, so as to combine the limit screw 31 and the scale barrel 33 through the first clutch tooth and the second clutch tooth, so that the limit screw 31 is connected to the scale barrel 33 in transmission. Or the first clutch tooth is disengaged from the second clutch tooth to prevent the limit screw 31 and the scale barrel 33 from rotating synchronously.

[0084] Specifically, the rotating part adopts the design of a graduated cylinder 33. The graduated cylinder 33 is connected to the side wall of the housing 1 by threads, and this connection mode enables the graduated cylinder 33 to rotate and move along the axial direction of the housing 1. This design not only provides stable rotation support, but also ensures the accuracy and reliability of rotation by threaded connection.

[0085] A limit screw 31 is arranged inside the scale barrel 33. A first clutch tooth is arranged at one end of the limit screw 31, and a second clutch tooth adapted to the first clutch tooth is arranged on the scale barrel 33. This design enables the pressing part to adjust the limit screw 31 by pressing operation, so that the first clutch tooth is engaged or disengaged with the second clutch tooth. When the two are engaged, the limit screw 31 and the scale barrel 33 are connected in transmission, that is, they can rotate synchronously. When the two are disengaged, the limit screw 31 no longer rotates synchronously with the scale barrel 33, so that switching between different working modes can be achieved.

[0086] In addition, the driving rod 32 is disposed in the limiting screw 31 and is slidable along the axial direction of the limiting screw 31. This design enables the driving rod 32 to slide along the limiting screw 31 when necessary, thereby driving the injection mechanism 4 to perform an injection action. One end of the injection mechanism 4 is disposed in the driving rod 32, so that the sliding of the driving rod 32 can directly drive the injection mechanism 4 to work.

[0087] In actual operation, the user can adjust the injection dose by rotating the scale barrel 33. When the scale barrel 33 rotates, it moves axially because it is threadedly connected to the side wall of the housing 1. At this time, the limit screw 31 does not rotate, but only moves axially with the adjustment of the dose. Since the scale barrel 33 rotates and the limit screw 31 does not rotate, the limit part moves axially along the driving part under the drive of the rotating part, so that the injection dose can be adjusted.

[0088] At this time, if the user hopes that the rotation of the scale barrel 33 can drive the injection mechanism 4 to inject, the first clutch tooth and the second clutch tooth can be combined through the pressing part, thereby realizing the synchronous rotation of the limit screw 31 and the scale barrel 33 to cooperate with the injection mechanism 4 to complete the injection.

[0089] When the driving rod 32 axially jumps, the internal position of the driving rod 32 will be offset, thereby driving the position of the injection mechanism 4 to change, which will affect the movement of the drug in the cartridge 5 to the injection site (needle point) and cause leakage.

[0090] To solve the above problem, a limiting ratchet 321 is provided at one end of the driving rod 32, a notch adapted to the driving rod 32 is formed on the mounting seat 221, a first tooth groove matched with the limiting ratchet 321 is formed on the sliding nut 23, the driving rod 32 passes through the notch and is arranged in the first tooth groove, and the mounting seat 221 cooperates with the first tooth groove to fix the driving rod 32 axially along the shell 1.

[0091] In this embodiment, the first tooth groove is provided and the mounting seat 221 is provided on the first tooth groove to fix the drive rod 32 in the axial direction, so as to avoid axial runout caused when the limiting ratchet 321 of the drive rod 32 is engaged with the first tooth groove of the sliding nut 23 during dose adjustment.

[0092] In some embodiments, Fig. 9 As shown, the injection mechanism 4 includes a pressing block 41 and a piston rod 42. One end of the piston rod 42 is disposed in the driving rod 32. The piston rod 42 is transmission-connected to the driving rod 32, and the other end of the piston rod 42 passes through the notch and the sliding nut 23 to be connected to the pressing block 41, and the piston rod 42 is threadedly connected to the sliding nut 23.

[0093] In this embodiment, the pressing block 41 is the end effector of the injection mechanism, directly contacts the liquid medicine in the cartridge 5, and pushes the liquid medicine out of the cartridge 5 by applying pressure. The piston rod 42 is the key component connecting the driving part and the pressing block 41, and is responsible for transmitting the power of the driving rod 32 to the pressing block 41.

[0094] In this embodiment, one end of the piston rod 42 is disposed in the driving rod 32 and is in transmission connection with the driving rod 32. This design enables the piston rod 42 to rotate when the driving rod 32 rotates. The other end of the piston rod 42 passes through the notch and the sliding nut 23 to connect with the pressing block 41, and the piston rod 42 is threadedly connected with the sliding nut 23, so that when the piston rod 42 rotates, it can move relative to the sliding nut 23, thereby moving the pressing block 41.

[0095] During the actual injection process, when the driving rod 32 rotates, the piston rod 42 rotates accordingly, and translates relative to the sliding nut 23 by cooperating with the thread of the sliding nut 23. The movement of the piston rod 42 drives the pressing block 41 to apply pressure to the liquid medicine in the cartridge, thereby pushing the liquid medicine out of the cartridge to complete the injection.

[0096] In one example, if Fig.10 and Fig.13 As shown, the scale barrel 33 is provided with a second tooth groove, and the limiting screw 31 is provided with a third tooth groove. The pressing portion includes: a button 34. The injection device adapted to multiple specifications of cartridges also includes: a double-layer ratchet 35. The double-layer ratchet 35 is arranged on the limiting screw 31. The button 34 is arranged on the double-layer ratchet 35, one side of the double-layer ratchet 35 extends to cooperate with the second tooth groove, and the other side of the double-layer ratchet 35 extends to cooperate with the third tooth groove.

[0097] In this embodiment, the double-layer ratchet 35 is a key component of the pressing part and adopts a double-layer sound-generating tooth design. This design enables the double-layer ratchet 35 to produce a clear sound when it is pressed or moved, thereby providing operation feedback to the user. The double-layer ratchet 35 is arranged on the scale barrel 33 and moves with the rotation of the scale barrel 33. A first ratchet 351 is provided on one side of the double-layer ratchet 35, and a second ratchet 352 is provided on the other side. The first ratchet 351 extends to cooperate with the second tooth groove, and the second ratchet 352 extends to cooperate with the third tooth groove.

[0098] The button 34 is connected to the double-layer ratchet 35. The user can control the movement of the limit screw 31 through the double-layer ratchet 35 by pressing the button 34 to control whether the limit screw 31 is combined with the scale barrel 33. When the user rotates the scale barrel 33 to adjust the injection dose, the double-layer ratchet 35 interacts with the limit screw 31 or other parts of the scale barrel 33 to generate sound feedback. This sound feedback can not only help the user confirm the rotation action of the scale barrel 33, but also improve the accuracy and stability of the operation.

[0099] In addition, the design of the double-layer ratchet 35 also takes into account the clarity and volume of the sound. By optimizing the structure and material selection of the double-layer sound teeth, it can be ensured that the sound produced is both clear and loud, so that the user can easily hear and recognize the operation feedback.

[0100] Based on the above embodiments, in one embodiment, if Figure 2 , Figure 3 and Fig.11 As shown, the housing 1 includes: a pen cap 12, a core barrel 13, a pen body 14 and a nut bushing 11. The core barrel 13 is connected to the pen body 14, the pen cap 12 is sleeved on the core barrel 13, the core barrel 13 is provided with a cartridge 5, the pen body 14 is provided with other components in cooperation with the core barrel 13, the nut bushing 11 is provided in the pen body 14, and the nut bushing 11 is threadedly connected with the scale barrel 33.

[0101] Specifically, the housing 1 mainly includes several core components, namely, a pen cap 12, a pen core tube 13, a pen body 14 and a nut bushing 11. These components work together to form a basic framework of the injection device.

[0102] The core barrel 13 is closely connected to the pen body 14, and together they form a complete injection device body. The interior of the core barrel 13 is used to accommodate the cartridge 5. The interior of the pen body 14 is used to accommodate key components such as the driving part, the rotating part and part of the injection mechanism. This design enables these components to be tightly integrated inside the housing 1, achieving structural compactness and functional integrity. The pen cap 12 is sleeved on the core barrel 13 to play a protective and dustproof role. When the injection device is not in use, the user can cover the core barrel 13 with the pen cap 12 to prevent dust and impurities from entering the interior. This design not only extends the service life of the injection device, but also improves the user experience.

[0103] The nut bushing 11 is a key component for connecting the scale barrel 33 and the pen body 14. It is arranged in the housing 1 and is threadedly connected with the scale barrel 33. This connection method not only ensures that the scale barrel 33 can be firmly fixed on the pen body 14, but also realizes the rotation adjustment function of the scale barrel 33. By adjusting the position of the nut bushing 11, the range of the injection dose can be adjusted.

[0104] It should be noted that corresponding windows are provided on the nut bushing 11 and the pen body 14. The nut bushing 11 is installed on the distal end of the pen body 14 through the axial guide key around it; after the assembly is completed, the window of the nut bushing 11 coincides with the window of the pen body 14, and the window of the nut bushing 11 is sleeved in the window of the pen body 14. According to the single maximum dose requirement, the nut bushing 11 is machined by special equipment, and different lengths are customized so that its bottom edge cooperates with the boss on the scale cylinder 33, thereby achieving the single maximum dose requirements of different doses. Since changing the length of the nut bushing 11 does not require repeated mold opening, only machining processing is required, and there is no mold opening cycle, it can be quickly verified, reducing the R&D cycle and R&D design verification costs.

[0105] In summary, this embodiment constructs a stable, reliable and easy-to-operate injection device through the carefully designed pen cap, pen core barrel, pen body and nut bushing. This design not only improves the applicability and stability of the injection device, but also provides users with a more comfortable and convenient use experience.

[0106] In some embodiments, Figure 2 , Figure 3 and Fig.12 As shown, the limiting part includes: a limiting ring 36; a key bar extending along the axial direction of the scale cylinder 33, and a key groove 362 adapted to the key bar is provided on the limiting ring 36. The limiting ring 36 is arranged on the scale cylinder 33 through the key bar and the key groove 362, and the limiting ring 36 is rotatably mounted on the limiting screw 31.

[0107] When adjusting the dose, the scale barrel 33 can rotate, while the limit screw 31 remains stationary. At this time, the limit ring 36 is driven by the key bar inside the scale barrel 33 to rotate and move on the limit screw 31. This movement process is actually memorized according to the scale rotated by the user when adjusting the dose. Therefore, the user can intuitively understand the adjusted dose by observing the position of the limit ring 36 on the limit screw 31.

[0108] The advantage of this design is that it realizes precise adjustment and intuitive memory of dosage through the cooperation between the limit ring 36, the scale barrel 33 and the limit screw 31. The user does not need to frequently check the scale or perform complex calculations, but only needs to observe the position of the limit ring 36 to understand the current dosage. This not only improves the convenience of operation, but also reduces the difficulty of use, making the injection device more suitable for a wide range of users.

[0109] Specifically, a stopper is provided at the starting end and / or the ending end of the limiting screw 31 for the limiting ring 36 to move, and a stopper 361 is provided on the limiting ring 36. The limiting screw 31 limits the moving range of the limiting ring 36 through the stopper 361 and the stopper.

[0110] When adjusting the dose, the scale cylinder 33 rotates, and the limit ring 36 can move between the starting end and the ending end under the restriction of the stop position 361 and the block. The total movement stroke of the limit ring 36 corresponds to the total amount of medicine in the cartridge 5. When adjusting the dose, if the limit ring 36 reaches the ending end, it means that the dose adjusted at this time is the remaining dose in the cartridge 5.

[0111] In some embodiments, the limiting ring 36 may be designed as a semicircular ring, which not only ensures its stable rotation between the scale barrel 33 and the limiting screw 31, but also reduces the amount of material used, facilitates installation, and makes the entire device lighter. The shape of the semicircular ring also makes it easier for the user to observe its position on the limiting screw 31, further improving the intuitiveness of the dosage adjustment.

[0112] In addition, the semicircular stop ring 36 is also simpler to manufacture, which can reduce production costs and improve production efficiency. This design takes both practicality and economy into consideration, making the injection device more suitable for large-scale production and wide application.

[0113] In addition to the semicircular ring design, the limiting ring 36 can also adopt other shapes and structures to adapt to different usage scenarios and needs. For example, according to the overall design style of the injection device and the user's operating habits, different sizes of rings, different materials of ring bodies, and different connection methods can be selected.

[0114] In general, this design of achieving precise dosage adjustment and intuitive memory through the cooperation of the limiting ring 36, the scale cylinder 33 and the limiting screw 31 greatly improves the convenience of use and user experience of the injection device. At the same time, the semicircular ring design of the limiting ring 36 not only ensures the realization of the function, but also optimizes the structure and appearance of the device, making the entire injection device more in line with the user's usage habits.

[0115] In a specific embodiment, Figures 1 to 11 As shown, the assembly process of the injection device is as follows:

[0116] The first step is to assemble the main structure of the injection device, the steps are as follows:

[0117] Install the nut bushing 11 into the distal end of the pen body 14 through the axial guide key around it; the viewing window of the nut bushing 11 overlaps with the viewing window of the pen body 14, and the viewing window of the nut bushing 11 is sleeved in the viewing window of the pen body 14. Then the external thread of the scale barrel 33 is rotatably connected with the internal thread of the nut bushing 11; the limit ring 36 is installed at a specific position on the limit screw 31, and the thread inside the limit ring 36 is connected with the thread on the limit screw 31. After the limit ring 36 is rotated to the top, the stopper on the limit screw 31 will fit with the stop position of the limit ring 36. Then insert the distal end of the scale barrel 33 inward into the pen body 14, and match the keyway on the limit ring 36 with the key bar in the hole of the scale barrel 33 while ensuring that the limit ring 36 does not rotate. After being assembled in place, the first clutch tooth on the limit screw 31 will engage with the second clutch tooth in the scale barrel 33; the small end ratchet piece of the double-layer ratchet 35 is installed into the tooth groove in the distal end of the limit screw 31. When installing, it needs to be pressed hard so that the middle connecting plate of the double-layer ratchet 35 is pressed into the double-layer ratchet 35 installation groove in the scale barrel 33 through deformation, and the large end teeth of the double-layer ratchet 35 are also matched with the tooth groove in the scale barrel 33. After the double-layer ratchet 35 is assembled, the button 34 is pressed into the top shaft of the double-layer ratchet 35, and the card of the button 34 is matched with the button snap ring groove of the double-layer ratchet 35 to complete the assembly of the main structure.

[0118] The second step is to assemble the drive part of the entire injection device. The steps are as follows:

[0119] Rotate the piston rod 42 into the threaded hole in the middle of the sliding nut 23, expose the pressure block installation head at the head of the piston rod 42, and install the pressure block 41 into the pressure block installation head at the front end of the piston rod; after the pressure block 41 is installed, install the rear end of the piston rod 42 into the driving rod 32. Install the driving rod 32 with the limit ratchet facing the end of the sliding nut 23, and at this time, the piston rod 42 penetrates into the inner hole of the driving rod 32. When the limit ratchet on the driving rod 32 is installed into the sliding nut 23, slightly rotate the driving rod 32 so that the limit ratchet and the first tooth groove of the sliding nut 23 are in place. After the installation of the driving rod 32 is completed, insert the elastic movable structure 22 from the rear end of the driving rod 32, and then press it into the card groove on the sliding nut 23 to fix it.

[0120] The third step is to install the drive part into the main structure of the injection device, the steps are as follows:

[0121] The chamfered end of the driving rod 32 on the driving part is inserted from the inner hole of the proximal end of the pen body 14 into the inner hole of the limiting screw 31. After the insertion, the two keyways on the surface of the driving rod 32 will cooperate with the two keys at the bottom of the inner hole of the limiting screw 31. The driving rod 32 and the limiting screw 31 cannot rotate relative to each other, but can move axially relative to each other; then rotate the sliding nut 23 to align the keyways on both sides of the sliding nut 23 with the guide keys inside the pen body 14, and press the driving part into the pen body 14. At this time, the driving part can slide in the pen body 14 under the action of the elastic member on the elastic movable structure 22. Then install the elastic gripping structure 21 into the card slot at the front end of the pen core barrel 13. After the installation is completed, the elastic gripping structure 21 will not fall off the pen core barrel 13; then install the cartridge 5 into the pen core barrel 13. At this time, the front end of the cartridge 5 is centered by the small diameter inner hole at the front end of the pen core barrel 13, and the back is centered by the elastic gripping structure 21. This elastic gripping structure 21 is compatible with cartridge bottles of different diameters; after the cartridge 5 is installed, the core barrel 13 is installed into the pen body 14. At this time, the two side pieces at the open end of the core barrel 13 need to fit with the matching surfaces on both sides of the sliding nut 23, and the annular arc protrusion on the open end of the core barrel 13 will cooperate with the arc groove inside the proximal end of the pen body 14 to achieve the purpose of positioning and installation and fastening; finally, the pen cap 12 is installed, and the annular groove at the opening of the pen cap 12 will cooperate with the two protrusions on the outer surface of the core barrel 13 to achieve the purpose of preventing falling off, and the assembly of the entire injection device is completed.

[0122] The process of using the injection device is divided into a dose setting stage and a drug injection stage.

[0123] During the dose phase:

[0124] If the dosage of the medicine needs to be increased, the graduated cylinder 33 is rotated outward. At this time, the graduated cylinder 33 moves outward under the drive of the internal thread of the nut bushing 11. Since the first clutch tooth on the driving rod 32 and the second clutch tooth on the graduated cylinder 33 are disengaged by force, and the driving rod 32 does not rotate (the limit ratchet on the driving rod 32 can only rotate in one direction under a certain force under the action of the first tooth groove in the sliding nut 23, and the limit ratchet cannot rotate when the dosage is increased), the small end ratchet of the double-layer ratchet 35 cannot rotate, causing the large end ratchet to continuously pass over the ratchet plate under the rotation of the graduated cylinder 33, and emit a positive adjustment sound. At the same time, the double-layer ratchet 35, the limit screw 31, and the button 34 will move outward synchronously with the adjustment of the increase in dosage. At this time, since the scale barrel 33 is rotating and the limit screw 31 is not rotating, the limit ring 36 is internally rotated and moved on the limit screw 31 by the keyway in the scale barrel 33 to memorize the adjusted amount of medicine in the cartridge 5.

[0125] If the dosage of the medicine needs to be reduced, the graduated cylinder 33 is rotated inward. At this time, the graduated cylinder 33 moves inward under the drive of the internal thread of the nut bushing 11. Since the first clutch tooth on the driving rod 32 and the second clutch tooth on the graduated cylinder 33 are disengaged by force, the internal force of the ratchet piece of the driving rod 32 and the sliding nut 23 is greater than the force required for the small end ratchet of the double-layer ratchet 35 at the top to cross the tooth groove, so it will not rotate, and the small end ratchet of the double-layer ratchet 35 can also emit a negative adjustment sound. At the same time, the double-layer ratchet 35, the limit screw 31, and the button 34 will move inward synchronously with the adjustment of increasing the dosage.

[0126] During the injection phase:

[0127] After the dosage adjustment is completed, when injecting, the button 34 is pressed. At this time, the force of the button 34 is transmitted to the limit screw 31 through the double-layer ratchet 35, so that the first clutch tooth on the limit screw 31 and the second clutch tooth on the scale barrel 33 cannot be separated; then, under the cooperation of the internal thread on the nut bushing 11 and the external thread of the scale barrel 33, the scale barrel 33 is rotated and moved downward. At this time, the limit screw 31 and the scale barrel 33 can be regarded as one body. When the scale barrel 33 rotates and descends, the limit screw 31 also rotates and descends. Since the inner hole of the limit screw 31 is connected to the drive rod 32, which can only move axially and cannot rotate relatively, the limit screw 31 rotates and the drive rod 32 also rotates. At this time, the force of the drive rod 32 rotating can overcome the deformation force generated by the ratchet of the drive rod 32 and the sliding nut 23, resulting in the normal rotation of the drive rod 32, and the limit ratchet on the drive rod 32 can also make a sound when crossing the tooth groove, which is manifested as an injection sound. When the driving rod 32 rotates, the piston rod 42 inside the driving rod 32 and the non-circular shape thereof also rotates therewith. At this moment, the sliding nut 23 itself does not rotate, so the piston rod 42 can extend outwards under the effect of the sliding nut 23 internal threads to achieve the injection purpose.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An injection device, characterized in that: include: a housing adapted to accommodate the cartridge; The adjusting mechanism comprises a limiting part, a driving part, a rotating part and a pressing part; The rotating part can move along the axial direction of the shell, the driving part is arranged in the rotating part, and the limiting part is threadedly connected to the driving part; the pressing part is used to control the driving part to switch between the adjustment position and the injection position; a double-layer ratchet is provided on the driving part, one side of the double-layer ratchet is provided with a first ratchet, and the other side is provided with a second ratchet, the first ratchet rotates relative to the rotating part to produce a positive adjustment sound, and the second ratchet rotates relative to the driving part to produce a negative adjustment sound; The injection mechanism is arranged in the shell and is used for moving along the axial direction of the shell during the rotation process.

2. The injection device according to claim 1, characterized in that Also includes: The adapter mechanism is arranged in the housing and is suitable for fixing cartridges of different diameters and / or lengths.

3. The injection device according to claim 2, characterized in that The adapting mechanism comprises: an elastic grasping structure; The elastic gripping structure is arranged in the housing and is used for gripping cartridges of different diameters.

4. The injection device according to claim 2 or 3, characterized in that: The adapting mechanism comprises: a sliding nut and an elastic movable structure; The sliding nut is movable along the axial direction of the shell, and the elastic movable structure is used to abut between the platform extending inwardly of the shell and the sliding nut to cooperate with the sliding nut and the side wall of the shell to fix cartridges of different lengths.

5. The injection device according to claim 4, characterized in that The elastic movable structure comprises: a mounting seat and an elastic member; A second protrusion that is engaged with the sliding nut is formed on one side of the mounting seat so that the mounting seat is fixed on the sliding nut; the elastic member is connected to the other side of the mounting seat for abutting against the shell.

6. The injection device according to claim 5, characterized in that The driving part includes: a limiting screw and a driving rod; the rotating part includes a graduated cylinder; The scale barrel is arranged on the housing, the limit screw is arranged in the scale barrel, the drive rod is arranged in the limit screw, the drive rod is slidable along the axial direction of the limit screw, and one end of the injection mechanism is arranged in the drive rod; A first clutch tooth is provided at one end of the limit screw, and a second clutch tooth adapted to the first clutch tooth is provided on the scale cylinder. The pressing portion is suitable for adjusting the limit screw by pressing, so as to combine the limit screw and the scale cylinder through the first clutch tooth and the second clutch tooth, or to disengage the first clutch tooth from the second clutch tooth.

7. The injection device according to claim 6, characterized in that A limiting ratchet is provided at one end of the driving rod, a notch adapted to the driving rod is formed on the mounting seat, a first tooth groove matched with the limiting ratchet is formed on the sliding nut, the driving rod passes through the notch and is arranged in the first tooth groove, and the mounting seat cooperates with the first tooth groove to fix the driving rod axially along the shell.

8. The injection device according to claim 7, characterized in that The injection mechanism comprises a pressing block and a piston rod; One end of the piston rod is arranged in the driving rod and is transmission-connected with the driving rod. The other end of the piston rod passes through the notch and the sliding nut and is connected with the pressing block, and the piston rod is threadedly connected with the sliding nut.

9. The injection device according to claim 6, characterized in that The graduated cylinder is provided with a second tooth groove, and the limiting screw is provided with a third tooth groove; The injection device further comprises: a double-layer ratchet; The double-layer ratchet is arranged on the limiting screw, the first ratchet on one side of the double-layer ratchet extends to cooperate with the second tooth groove, and the second ratchet on the other side of the double-layer ratchet extends to cooperate with the third tooth groove.

10. The injection device according to claim 6, characterized in that The housing comprises: a pen cap, a pen core tube, a pen body and a nut bushing; The core barrel is connected to the pen body, the pen cap is sleeved on the core barrel, the core barrel is used to accommodate a medicine cartridge, the nut bushing is arranged in the pen body, and the nut bushing is threadedly connected to the scale barrel.

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