Syringe assembly and injection device

Abstract

The application is suitable for the technical field of medical devices, and provides a syringe assembly and an injection device. The syringe assembly comprises a shell assembly, a limiting piece, a clutch assembly, a push rod assembly and a driving mechanism. In use, a first external force can be used to drive the clutch assembly to disengage from the first limiting part, so that the clutch assembly rotates in the counterclockwise direction under the driving of the driving mechanism, the push rod assembly rotates in the counterclockwise direction with the clutch assembly, and the push rod assembly moves axially towards the distal end relative to the movement, so as to drive the medicine in the medicine bottle assembly to the distal end. The clutch assembly and the limiting piece are both sleeved outside the push rod assembly, the fixing sleeve is sleeved outside the limiting piece, and the main body abuts against the first limiting structure axially towards the distal end, so that the gap between the limiting piece and the fixing piece and the gap between the push rod assembly and the limiting piece can be reduced, thereby improving the entry of the liquid through the gap between the fixing piece and the limiting piece and the gap between the push rod assembly and the limiting piece into the shell assembly, and thus the waterproof effect of the syringe assembly can be improved.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and more specifically, relates to a syringe assembly and injection device. Background Technology

[0002] Insulin pens are common medical tools for injecting insulin and are widely used by diabetic patients. To save resources, some insulin pens on the market include syringe pens and vial pens. The vial pens include a mounting bracket and a vial housed within the bracket. The mounting bracket is detachably attached to the syringe pens, allowing the vial pens or vials to be replaced and enabling the syringe pens to be reused.

[0003] When an insulin pen is in operation, the plunger inside the syringe assembly moves towards the vial assembly to expel the insulin, thus injecting the medication. This necessitates a channel in the syringe assembly connecting the internal components of the syringe assembly and the vial assembly, allowing the plunger to expel the insulin. However, this channel design compromises the syringe assembly's waterproofing. During transportation, the vial may break under extreme conditions, leading to potential leakage of the insulin. This leakage could then enter the syringe assembly through the channel, potentially affecting the syringe assembly's performance and lifespan.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Utility Model Content

[0005] One of the objectives of this application is to provide a syringe assembly and injection device that can improve the problem of poor waterproof performance of the syringe assembly.

[0006] To solve the above-mentioned technical problems, the technical solution adopted in the embodiments of this application is as follows: In a first aspect, embodiments of this application provide a syringe assembly applied to an injection device, wherein the two ends of the injection device along the axial direction are a proximal end and a distal end, respectively; the syringe assembly includes: The housing assembly includes a housing and a fastener. The housing has a first limiting part. The fastener includes a fixing sleeve and a first limiting structure disposed on the inner peripheral wall of the fixing sleeve. The fixing sleeve is fixed to one end of the housing along the axial direction near the distal end and is used to install the medicine bottle assembly. The limiting component includes a main body and a second limiting structure. A fixing sleeve is fitted over the main body and the second limiting structure. The main body abuts against the first limiting structure at the distal end along the axial direction. The second limiting structure is located at the end of the main body near the distal end along the axial direction and is circumferentially limited and fitted with the first limiting structure. The clutch assembly is rotatably mounted on the main body and is axially limited to the main body; the clutch assembly is circumferentially limited on the first limiting part and is configured to disengage from the first limiting part under the action of a first external force. The push rod assembly is threaded to the second limiting structure and is circumferentially limited on the clutch assembly. The clutch assembly, the main body, and the second limiting structure are all sleeved outside the push rod assembly. The push rod assembly is configured to move axially toward the distal end relative to the clutch assembly and the limiting member when rotating counterclockwise relative to the limiting member, so as to drive the medicine in the vial assembly. The drive mechanism, located on the housing, is used to provide a driving force for the clutch assembly to rotate counterclockwise.

[0007] In some embodiments, the first limiting structure includes: A limiting ring is provided on the inner circumferential wall of the fixed sleeve; The second limiting part is provided on the inner peripheral wall of the limiting ring, and the main body abuts against the limiting ring and the second limiting part along the axial direction towards the far end; The second limiting structure includes: The main body is located at one end of the main body near the distal end along the axial direction, and is sleeved on the outside of the push rod assembly and threadedly connected to the push rod assembly; The third limiting part is provided on the outer peripheral wall of the main body and cooperates with the second limiting part in a circumferential limiting manner. On the projection plane perpendicular to the axial direction, the orthographic projection outline of the main body is surrounded outside the orthographic projection of the third limiting part.

[0008] In some embodiments, the inner peripheral wall of the limiting ring is provided with a plurality of second limiting portions arranged in the circumferential direction, and the outer peripheral wall of the main body is provided with a plurality of third limiting portions arranged in the circumferential direction. The second limiting portions are located between two adjacent third limiting portions in the circumferential direction, and the third limiting portions are located between two adjacent second limiting portions in the circumferential direction.

[0009] In some embodiments, the main body resiliently abuts against a first limiting structure axially toward the distal end; a second limiting structure abuts against a vial of a vial assembly axially toward the distal end, and the main body is configured to move relative to a fixed sleeve axially toward the proximal end as the second limiting structure abuts against the vial axially toward the distal end.

[0010] In some embodiments, the clutch assembly includes: A rotating component is rotatably mounted on the main body and is axially positioned with the main body; the rotating component is sleeved on the outside of the push rod assembly and is circumferentially positioned with the push rod assembly, and the push rod assembly is configured to move axially relative to the rotating component. A clutch element is spaced apart from a rotating element; the clutch element is circumferentially limited on a first limiting portion and configured to disengage from the first limiting portion under the action of a first external force; a drive mechanism is used to provide a driving force for the clutch element to rotate counterclockwise. The first elastic element is disposed between the rotating element and the clutch element, and is used to apply an elastic force to the rotating element and the limiting element to move relative to the housing assembly in the axial direction toward the distal end, so that the main body can abut against the first limiting structure in the axial direction toward the distal end. The limiting component is configured such that it moves axially toward the proximal end under the pressure of the medicine bottle assembly, so that the rotating component and the clutch component are circumferentially limited and engaged.

[0011] In some embodiments, the main body is sleeved outside the clutch assembly, the inner peripheral wall of the main body is provided with a limiting groove, the outer peripheral wall of the clutch assembly is provided with a first protrusion, and the first protrusion is axially limited within the limiting groove.

[0012] In some embodiments, the outer peripheral wall of the push rod assembly is provided with a first groove, the first groove extending axially, and the inner peripheral wall of the clutch assembly is provided with a second protrusion, the second protrusion being circumferentially confined within the first groove and capable of sliding axially along the first groove.

[0013] In some embodiments, the housing is provided with a third limiting structure; the driving mechanism includes: An adjustment component is rotatably disposed within the housing and sleeved on the outside of the push rod assembly; the adjustment component is limited to the clutch assembly in a counterclockwise direction and is also configured to rotate relative to the clutch assembly under the action of a second external force; A numerical rotary drum is threaded into the housing; the numerical rotary drum is sleeved outside the adjustment assembly and circumferentially limited on the adjustment assembly, and is configured to move axially relative to the housing assembly and the adjustment assembly as it rotates with the adjustment assembly to adjust the scale; The second elastic element is connected between the housing assembly and the adjustment assembly and is configured to provide the adjustment assembly with an elastic force that rotates counterclockwise, so that the numerical rotating cylinder is limited to the third limiting structure in the counterclockwise direction.

[0014] In some embodiments, the clutch assembly has a plurality of ratchet teeth arranged circumferentially at one end of the clutch assembly along the axial direction toward the proximal end, and the ratchet teeth are inclined in a clockwise direction; The adjustment components include: The adjusting body is rotatably disposed inside the housing and sleeved outside the push rod assembly, and is located at the end of the clutch assembly facing the proximal end; the numerical rotary cylinder is sleeved outside the adjusting body, the adjusting body is connected to the second elastic element, and is circumferentially limited to cooperate with the numerical rotary cylinder; The elastic tooth is provided on the adjusting body and extends outward from the adjusting body at the distal end; the elastic tooth elastically engages between two adjacent ratchet teeth, is limited to the ratchet teeth in the counterclockwise direction, and is used to elastically move relative to the ratchet teeth in the clockwise direction under the action of a second external force, and is also used to elastically move relative to the ratchet teeth in the counterclockwise direction under the action of a second external force.

[0015] Secondly, embodiments of this application provide an injection device, comprising: Syringe assembly; A vial assembly, including a mounting bracket detachably mounted on a housing assembly and a vial detachably mounted on the mounting bracket; The injection needle is detachably mounted on the mounting bracket and is connected to the vial.

[0016] The beneficial effects of the syringe assembly and injection device provided in this application are as follows: The syringe assembly provided in this application embodiment can be used to drive the clutch assembly to disengage from the first limiting part by a first external force. Based on the fact that the push rod assembly is circumferentially limited on the clutch assembly, and the driving mechanism is used to provide a driving force for the clutch assembly to rotate in a counterclockwise direction, the clutch assembly rotates in a counterclockwise direction relative to the housing and the limiting part under the drive of the driving mechanism. The push rod assembly rotates in a counterclockwise direction relative to the housing assembly and the limiting part along with the clutch assembly, and moves axially toward the distal end relative to the housing assembly, the clutch assembly and the limiting part, so as to drive the medicine in the vial assembly to the distal end. By having the clutch assembly, main body, and second limiting structure all fitted outside the push rod assembly, and the fixing sleeve of the fixing member fitted outside the main body and second limiting structure, and the main body abutting against the first limiting structure of the fixing member axially towards the distal end, the gaps between the limiting member and the fixing member, and between the push rod assembly and the limiting member, can be reduced. This can improve the ability of the medicine to enter the housing assembly through the gaps between the fixing member and the limiting member, and between the push rod assembly and the limiting member, thus improving the waterproof effect of the syringe assembly.

[0017] The injection device provided in this application, by employing the syringe components involved in the above embodiments, can improve the waterproof effect of the syringe components, thereby improving the waterproof effect of the injection device.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 Three-dimensional structural diagrams of the injection device provided in some embodiments of this application; Figure 2 for Figure 1 decomposition Figure 1 ; Figure 3 for Figure 1 decomposition Figure 2 ; Figure 4 for Figure 1 A partial sectional view along AA; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 A partial cross-sectional view of a syringe assembly without the vial assembly provided in some embodiments of this application; Figure 7 A perspective structural view of the housing of a syringe assembly provided in some embodiments of this application; Figure 8 for Figure 7 Cross-sectional view; Figure 9 Partial perspective structural diagram of a syringe assembly provided in some embodiments of this application; Figure 10 A perspective view of the fixture of a syringe assembly provided in some embodiments of this application; Figure 11 Three-dimensional structure of the limiting member of the syringe assembly provided in some embodiments of this application Figure 1 ; Figure 12 Three-dimensional structure of the limiting member of the syringe assembly provided in some embodiments of this application Figure 2 ; Figure 13 A perspective structural view of the rotating component of the syringe assembly provided in some embodiments of this application; Figure 14 A perspective structural view of the plunger assembly and rotating component of the syringe assembly provided in some embodiments of this application; Figure 15 A perspective structural view of the plunger assembly of a syringe assembly provided in some embodiments of this application; Figure 16 A perspective structural view of the clutch element of a syringe assembly provided in some embodiments of this application; Figure 17 A perspective view of the numerical rotating cylinder of the syringe assembly provided in some embodiments of this application; Figure 18 A perspective structural view of the adjustment component of the syringe assembly provided in some embodiments of this application; Figure 19 Three-dimensional structure of the first adjusting member of the syringe assembly provided in some embodiments of this application Figure 1 ; Figure 20 A perspective view of the second adjusting member and the elastic tooth of the syringe assembly provided in some embodiments of this application; Figure 21 Three-dimensional structure of the first adjusting member of the syringe assembly provided in some embodiments of this application Figure 2 ; Figure 22 for Figure 21 A magnified view of point C in the middle.

[0021] The following are the labeling elements in the figure: 100-Injector assembly; 10-Housing assembly; 101-Window; 11-Housing; 111-First limiting part; 112-Second thread; 12-Fixing member; 121-Fixing sleeve; 122-First limiting structure; 1221-Limiting ring; 1222-Second limiting part; 13-Third limiting structure; 20-Limiting member; 201-Limiting groove; 21-Second limiting structure; 211-Third limiting part; 212-First thread; 213-Main body; 22-Main body; 30-Clutch assembly; 31-Rotating member; 311-First protrusion; 312-Second protrusion; 313-Fourth protrusion; 32-Clutch member; 321-Ratchet tooth; 322-Fifth protrusion; 323-Sixth protrusion; 33-First elastic member; 40-Push rod assembly; 401-First slide groove; 402-First Threaded groove; 50-Drive mechanism; 501-Slot; 502-Allowing groove; 503-Guide surface; 504-Second threaded groove; 505-Second slide groove; 51-Adjusting assembly; 511-Adjusting body; 5111-First adjusting component; 51111-First adjusting part; 51112-Second adjusting part; 5112-Second adjusting component; 51121-Snap fastener; 51122-Rib; 512-Elastic tooth; 52-Numerical rotary drum; 53-Second elastic component; 60-Knob; 70-Button; 80-Third elastic component; 90-Memory component; 200-Valve assembly; 210-Mounting bracket; 220-Valve; 230-Piston; 300-Injection needle; 400-Pen cap; a-Proximal end; b-Distal end; Y-Axial direction; W-Circumferential direction; W1-Clockwise direction; W2-Counterclockwise direction. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0023] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0024] Unless otherwise specified, all technical features and optional technical features of the embodiments of this application can be combined with each other to form new technical solutions.

[0025] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0027] In the description of the embodiments of this application, "multiple" means two or more, and unless otherwise explicitly specified, "two or more" includes two. Correspondingly, "multiple groups" means two or more groups, including two groups.

[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0029] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0030] The following detailed description is provided in conjunction with specific accompanying drawings and embodiments: Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a perspective structural diagram of the injection device provided in some embodiments of this application. Figure 2 for Figure 1 decomposition Figure 1 The syringe assembly 100 provided in this application embodiment is applied to an injection device, wherein the two ends of the injection device along the axial direction Y are a proximal end and b distal end, respectively.

[0031] The injection device may include a vial assembly 200 and an injection needle 300. The vial assembly 200 is mounted on the syringe assembly 100, and the injection needle 300 is mounted on the vial assembly 200 and is in communication with the vial assembly 200.

[0032] Proximal end a and distal end b refer to the approximate orientation of the injection device along the Y-axis. Proximal end a refers to the end of the injection device that is furthest from the injection site during injection, and distal end b refers to the end of the injection device that is closest to the injection site during injection. Understandably, the vial assembly 200, the injection needle 300, and the syringe assembly 100 all possess the aforementioned proximal end a and distal end b, and each component of the syringe assembly 100 also correspondingly possesses the aforementioned proximal end a and distal end b.

[0033] Specifically, the vial assembly 200 is mounted at the distal end b of the syringe assembly 100, and the injection needle 300 is mounted at the distal end b of the vial assembly 200. When the injection device is in use, the injection needle 300 is inserted into the injection site, and the components in the syringe assembly 100 move towards the distal end b to drive the medication within the vial assembly 200. The injection site can be a part of the human or animal body, such as the arm, buttocks, or waist.

[0034] Specifically, the vial assembly 200 includes a mounting bracket 210 and a vial 220 mounted within the mounting bracket 210. A piston 230 is disposed within the vial 220. The mounting bracket 210 is mounted on the distal end b of the syringe assembly 100. When the injection device is in use, the injection needle 300 is inserted into the injection site, and a component in the syringe assembly 100 moves toward the distal end b to drive the piston 230 to move axially Y toward the distal end b, thereby driving the liquid in the vial 220.

[0035] Although the syringe assembly 100 and injection device provided in this application embodiment are designed based on the problems encountered in the application of insulin injection pens, they are not limited thereto. The syringe assembly 100 and injection device can be used for the injection of drugs such as insulin and antibody drugs.

[0036] Please refer to the following: Figures 3 to 9 And in conjunction with other accompanying figures. Figure 3 for Figure 1 decomposition Figure 2 , Figure 4 for Figure 1 A partial sectional view along AA, Figure 5 for Figure 4 Enlarged view at point B in the middle. Figure 6This is a partial cross-sectional view of the syringe assembly 100 without the vial assembly 200 installed, provided in some embodiments of this application. Figure 7 This is a perspective view of the housing 11 of the syringe assembly 100 provided in some embodiments of this application. Figure 8 for Figure 7 Cross-sectional view, Figure 9 This is a partial perspective view of a syringe assembly 100 provided in some embodiments of this application. Figure 1 , Figure 4 and Figure 5 In the middle, the medicine bottle assembly 200 is installed on the fixing member 12 of the housing assembly 10, and the main body 22 of the limiting member 20 does not abut against the first limiting structure 122 of the fixing member 12 of the housing assembly 10 along the axial direction Y towards the distal end b. Figure 6 In this embodiment, the vial assembly 200 is not mounted on the fixing member 12 of the housing assembly 10, and the main body 22 of the limiting member 20 abuts against the first limiting structure 122 of the fixing member 12 of the housing assembly 10 along the axial direction Y toward the distal end b. The syringe assembly 100 provided in this application embodiment includes a housing assembly 10, a limiting member 20, a clutch assembly 30, a plunger assembly 40, and a drive mechanism 50.

[0037] The housing assembly 10 includes a housing 11 and a fixing member 12. A first limiting portion 111 is provided on the housing 11. Specifically, the first limiting portion 111 may be provided on the inner peripheral wall of the housing 11. The first limiting portion 111 is used to limit the clutch assembly 30 in the circumferential direction W, thereby restricting the rotation of the clutch assembly 30 relative to the housing 11, that is, restricting the rotation of the clutch assembly 30 relative to the housing assembly 10.

[0038] The fastener 12 includes a fastening sleeve 121 and a first limiting structure 122, which is disposed on the inner peripheral wall of the fastening sleeve 121. The fastening sleeve 121 is fixed to one end of the housing 11 along the axial direction Y towards the distal end b, specifically, the fastening sleeve 121 is fixed to a position on the housing 11 along the axial direction Y away from the proximal end a.

[0039] The retaining sleeve 121 is used to connect with the medicine bottle assembly 200. Specifically, the medicine bottle assembly 200 is installed at the distal end b of the retaining sleeve 121, that is, the medicine bottle assembly 200 is installed at the distal end b of the housing assembly 10.

[0040] The limiting member 20 includes a main body 22 and a second limiting structure 21, the second limiting structure 21 being disposed at one end of the main body 22 along the axial direction Y towards the distal end b. A fixing sleeve 121 is sleeved on the main body 22 and the second limiting structure 21, that is, the fixing sleeve 121 is sleeved on the limiting member 20. The main body 22 abuts against the first limiting structure 122 along the axial direction Y towards the distal end b. It can be understood that the main body 22 is disposed at the proximal end a of the first limiting structure 122 and abuts against the first limiting structure 122, so that the fixing member 12 can restrict the movement of the main body 22 along the axial direction Y towards the distal end b, thereby restricting the movement of the limiting member 20 along the axial direction Y towards the distal end b. The second limiting structure 21 and the first limiting structure 122 are circumferentially limited and engaged, so that the limiting member 20 cannot rotate relative to the fixing member 12, that is, the limiting member 20 cannot rotate relative to the housing assembly 10.

[0041] The clutch assembly 30 is rotatably disposed on the main body 22, thereby allowing the clutch assembly 30 to rotate relative to the limiting member 20. The clutch assembly 30 is limited on the main body 22 along the axial Y direction, such that the clutch assembly 30 is limited on the limiting member 20 along the axial Y direction, so that the clutch assembly 30 cannot move relative to the limiting member 20 along the axial Y direction.

[0042] The clutch assembly 30 is circumferentially limited to the first limiting portion 111 along the first limiting portion 111, and is configured to disengage from the first limiting portion 111 under the action of a first external force. Understandably, in the initial state, the clutch assembly 30 is circumferentially limited to the first limiting portion 111 along the first limiting portion 111 to achieve circumferential W-direction limiting between the clutch assembly 30 and the housing 11, thereby restricting the rotation of the clutch assembly 30 relative to the housing assembly 10, i.e., preventing the clutch assembly 30 from rotating relative to the housing assembly 10. When the clutch assembly 30 is subjected to the first external force, the clutch assembly 30 can disengage from the first limiting portion 111, thereby contacting the circumferential W-direction limiting between the clutch assembly 30 and the housing 11, at which point the clutch assembly 30 can rotate relative to the housing assembly 10.

[0043] The push rod assembly 40 is threadedly connected to the second limiting structure 21 of the limiting member 20, such that when the push rod assembly 40 rotates relative to the second limiting structure 21, the push rod assembly 40 will move relative to the second limiting structure 21 along the axial direction Y. The push rod assembly 40 is circumferentially limited on the clutch assembly 30, such that when the clutch assembly 30 rotates relative to the housing assembly 10, the push rod assembly 40 can rotate with the clutch assembly 30.

[0044] The clutch assembly 30, the main body 22, and the second limiting structure 21 are all sleeved outside the push rod assembly 40, that is, the clutch assembly 30 and the limiting structure 20 are both sleeved outside the push rod assembly 40. Since the fixing sleeve 121 is fixed to the housing 11 and sleeved outside the limiting structure 20, the housing 11 and the fixing structure 121 are also sleeved outside the push rod assembly 40. Specifically, the fixing sleeve 121 and the first limiting structure 122 are both sleeved outside the push rod assembly 40. It can be understood that the main body 22 is spaced outside the push rod assembly 40, so that when the push rod assembly 40 rotates relative to the second limiting structure 21, the push rod assembly 40 simultaneously rotates relative to the main body 22 and moves along the axial direction Y relative to the main body 22 and the second limiting structure 21, that is, when the push rod assembly 40 rotates relative to the limiting structure 20, the push rod assembly 40 moves along the axial direction Y relative to the limiting structure 20.

[0045] The push rod assembly 40 is configured to move axially towards the distal end b relative to the clutch assembly 30 and the limit member 20 when rotating counterclockwise W2 relative to the limit member 20, thereby driving the medicine in the vial assembly 200. Understandably, when the clutch assembly 30 rotates counterclockwise W2 relative to the housing assembly 10 and the limit member 20, the push rod assembly 40 rotates counterclockwise W2 along with the clutch assembly 30, causing the push rod assembly 40 to move axially towards the distal end b relative to the limit member 20, the clutch assembly 30, and the housing assembly 10, extending axially towards the distal end b beyond the housing 11 and the retainer 12, and driving the medicine in the vial assembly 200.

[0046] Understandably, the outer peripheral wall of the push rod assembly 40 is provided with a first threaded groove 402, and the inner peripheral wall of the second limiting structure 21 of the limiting member 20 is provided with a first thread 212. The first thread 212 and the first threaded groove 402 are threadedly connected, so that the limiting member 20 is sleeved on the outside of the push rod assembly 40 and is threadedly connected to the push rod assembly 40.

[0047] The drive mechanism 50 is mounted on the housing 11 and is used to provide the clutch assembly 30 with a driving force to rotate in the counterclockwise direction W2.

[0048] The circumferential direction W refers to the circumferential direction, which is perpendicular to the axial direction Y. The circumferential direction W can include clockwise direction W1 and counterclockwise direction W2, with clockwise and counterclockwise directions W1 and W2 being opposite. The clockwise and counterclockwise directions W1 and W2 can be defined from a perspective pointing from the proximal end a to the distal end b, or from a perspective pointing from the distal end b to the proximal end a. As an example, ... Figures 3 to 8 As shown, clockwise direction W1 and counterclockwise direction W2 are defined from the perspective of the near end a pointing to the far end b.

[0049] Based on the above structure, the working principle of the injection device is as follows: In the initial state, the clutch assembly 30 is circumferentially W-limited on the first limiting portion 111 of the housing 11. At this time, the clutch assembly 30 does not rotate relative to the housing 11, and the push rod assembly 40 does not rotate with the clutch assembly 30, so it does not move axially Y relative to the limiting member 20, the clutch assembly 30, and the housing assembly 10.

[0050] When the injection device is in use, a first external force can be applied to drive the clutch assembly 30 to disengage from the first limiting part 111. The push rod assembly 40 is circumferentially limited on the clutch assembly 30, and the drive mechanism 50 provides a driving force for the clutch assembly 30 to rotate counterclockwise in the direction W2. Driven by the drive mechanism 50, the clutch assembly 30 rotates counterclockwise in the direction W2 relative to the housing 11, the fixing member 12, and the limiting member 20. The push rod assembly 40 rotates counterclockwise in the direction W2 relative to the housing assembly 10 and the limiting member 20 along with the clutch assembly 30. During this process, based on the threaded connection between the push rod assembly 40 and the limiting member 20, the push rod assembly 40 moves axially Y towards the distal end b relative to the housing assembly 10, the clutch assembly 30, and the limiting member 20, thereby driving the liquid in the vial assembly 200 towards the distal end b.

[0051] The syringe assembly 100 provided in this application embodiment is fitted over the plunger assembly 40 by means of a clutch assembly 30, a main body 22, and a second limiting structure 21. The fixing sleeve 121 of the fixing member 12 is fitted over the main body 22 and the second limiting structure 21. The main body 22 abuts against the first limiting structure 122 of the fixing member 12 along the axial direction Y towards the distal end b. This can reduce the gap between the limiting member 20 and the fixing member 12, and between the plunger assembly 40 and the limiting member 20. This can improve the entry of liquid into the housing assembly 10 through the gap between the fixing member 12 and the limiting member 20, and between the plunger assembly 40 and the limiting member 20. In other words, the setting of the limiting member 20 can improve the entry of liquid into the housing assembly 10 through the gap between the housing assembly 10 and the plunger assembly 40. This can improve the waterproof effect of the syringe assembly 100. Specifically, when the vial 220 breaks under extreme conditions such as during transportation, causing leakage of the medicine, the combination of the limiting member 20 and the fixing member 12 prevents the medicine from entering the housing assembly 10. This mitigates the problem of the syringe assembly 100's performance and lifespan being affected by the medicine entering the housing assembly 10, and also reduces contamination caused by liquid entering the housing assembly 10.

[0052] In some embodiments, the inner peripheral wall of the fixing sleeve 121 and the outer peripheral wall of the main body 22 fit together, which can further reduce the gap between the fixing member 12 and the limiting member 20 and improve the waterproof effect of the syringe assembly 100.

[0053] In some embodiments, please refer to the following: Figure 3 , Figures 6 to 12 And in conjunction with other accompanying figures. Figure 10 This is a perspective view of the fixing member 12 of the syringe assembly 100 provided in some embodiments of this application. Figure 11 Three-dimensional structure of the limiting member 20 of the syringe assembly 100 provided in some embodiments of this application Figure 1 , Figure 12 Three-dimensional structure of the limiting member 20 of the syringe assembly 100 provided in some embodiments of this application Figure 2 The first limiting structure 122 includes a limiting ring 1221 and a second limiting part 1222. The limiting ring 1221 is disposed on the inner peripheral wall of the fixed sleeve 121, and the second limiting part 1222 is disposed on the inner peripheral wall of the limiting ring 1221. The main body 22 abuts against the limiting ring 1221 and the second limiting part 1222 along the axial direction Y towards the distal end b. The second limiting structure 21 includes a main body 213 and a third limiting part 211. The main body 213 is disposed at the end of the main body 22 along the axial direction Y near the distal end b. The main body 213 is sleeved on the outside of the push rod assembly 40 and threadedly connected to the push rod assembly 40. The third limiting part 211 is disposed on the outer peripheral wall of the main body 213. The third limiting part 211 and the second limiting part 1222 are mutually limitingly engaged along the circumferential direction W to achieve the limiting engagement of the first limiting structure 122 and the second limiting structure 21 along the circumferential direction W. On the projection plane perpendicular to the axial direction Y, the orthographic projection outline of the main body 22 surrounds the orthographic projection of the third limiting part 211.

[0054] Understandably, the limiting ring 1221 and the second limiting part 1222 are both sleeved on the outside of the push rod assembly 40, and the first thread 212 is provided on the inner peripheral wall of the main body part 213.

[0055] The second limiting part 1222 is provided on the inner peripheral wall of the limiting ring 1221, and the third limiting part 211 and the second limiting part 1222 are mutually limiting in the circumferential direction W, so that the limiting ring 1221 surrounds the third limiting part 211 and the main body part 213, and both the limiting ring 1221 and the second limiting part 1222 surround the main body part 213. The main body 22 abuts against the limiting ring 1221 and the second limiting part 1222 along the axial direction Y towards the distal end b. On the projection plane perpendicular to the axial direction Y, the orthographic projection outline of the main body 22 surrounds the orthographic projection of the third limiting part 211 and the main body 213, so that the main body 22 can be directly opposite all gaps between the second limiting structure 21 and the limiting ring 1221, and between the second limiting structure 21 and the second limiting part 1222. This can block the medicine from entering from between the second limiting structure 21 and the first limiting structure 122, thereby improving the waterproof effect between the limiting member 20 and the fixing member 12, and thus improving the waterproof effect of the syringe assembly 100.

[0056] In some embodiments, the third limiting portion 211 can be attached to the limiting ring 1221 and the second limiting portion 1222, and the main body portion 213 can be attached to the second limiting portion 1222. This can reduce the gap between the first limiting structure 122 and the second limiting structure 21 and improve the waterproof effect between the fixing member 12 and the limiting member 20.

[0057] In some embodiments, please refer to the following: Figures 10 to 12 Furthermore, in conjunction with other accompanying drawings, there are multiple second limiting portions 1222, which are disposed along the circumferential direction W on the inner circumferential wall of the limiting ring 1221. The outer circumferential wall of the main body 213 is provided with multiple third limiting portions 211 arranged along the circumferential direction W. The third limiting portions 211 are positioned along the circumferential direction W between two adjacent second limiting portions 1222, and the second limiting portions 1222 are positioned along the circumferential direction W between two adjacent third limiting portions 211, thus achieving a limiting engagement between the fixing member 12 and the limiting member 20 in the circumferential direction W.

[0058] This design can, on the one hand, improve the circumferential W-shaped limiting of the fixing member 12 and the limiting member 20, and on the other hand, reduce the gap between the first limiting structure 122 and the second limiting structure 21, thereby improving the waterproof effect between the fixing member 12 and the limiting member 20.

[0059] In some embodiments, the vial assembly 200 is detachably mounted on the housing assembly 10, specifically, the vial assembly 200 is detachably mounted on the fastener 12 of the housing assembly 10.

[0060] In some embodiments, the main body 22 elastically abuts against the first limiting structure 122 along the axial direction Y toward the distal end b. Specifically, under the elastic action, the main body 22 abuts against the first limiting structure 122 along the axial direction Y toward the distal end b. This can improve the fit between the main body 22 and the first limiting structure 122, effectively reduce the gap between the limiting member 20 and the fixing member 12, and improve the waterproof effect of the syringe assembly 100.

[0061] In some embodiments, please refer to the following: Figures 3 to 6 And in conjunction with other accompanying drawings. The second limiting structure 21 is used to elastically abut against the medicine bottle 220 of the medicine bottle assembly 200 along the axial direction Y toward the distal end b. The main body 22 is configured such that when the second limiting structure 21 abuts against the medicine bottle 220 along the axial direction Y toward the distal end b, the main body 22 moves relative to the fixing member 12 along the axial direction Y toward the proximal end a with the second limiting structure 21.

[0062] Understandably, when the second limiting structure 21 is not abutting against the medicine bottle 220 along the axial direction Y towards the distal end b, such as Figure 6As shown, the second limiting structure 21 is not subjected to pressure from the medicine bottle 220, and the main body 22 will not move relative to the fixing member 12 along the axial direction Y towards the proximal end a with the second limiting structure 21. Under the elastic action, the main body 22 will abut against the first limiting structure 122 along the axial direction Y towards the distal end b.

[0063] Accordingly, when both the mounting bracket 210 and the medicine bottle 220 of the medicine bottle assembly 200 are mounted on the fixing member 12, such as Figure 4 and Figure 5 As shown, the medicine bottle 220 abuts against the second limiting structure 21 along the axial direction Y towards the proximal end a, so that the second limiting structure 21 abuts against the medicine bottle 220 along the axial direction Y towards the distal end b. At this time, the second limiting structure 21 will move relative to the fixing member 12 along the axial direction Y towards the proximal end a under the pressure of the medicine bottle 220, and the main body 22 moves relative to the fixing member 12 along the axial direction Y towards the proximal end a with the second limiting structure 21. Thus, the main body 22 will be spaced at the proximal end a of the first limiting structure 122.

[0064] This configuration ensures that even if the vial assembly 200 is not mounted on the fixing member 12, or if the vial assembly 200 is mounted on the fixing member 12 and the vial 220 of the vial assembly 200 breaks under extreme conditions such as during transportation, resulting in leakage of the medicine, such as... Figure 6 As shown, the pressure of the medicine bottle 220 on the second limiting structure 21 will be removed, so that the main body 22 abuts against the first limiting structure 122 along the axial direction Y towards the far end b. This makes it difficult for the leaked medicine to enter the housing assembly 10 through the gap between the fixing member 12 and the limiting member 20, thereby improving the problem of medicine leakage into the housing assembly 10.

[0065] In some embodiments, please refer to the following: Figures 3 to 6 And in conjunction with other accompanying drawings. The clutch assembly 30 includes a rotating member 31, a clutch member 32, and a first elastic member 33. The rotating member 31 is rotatably disposed on the main body 22 and is limited to engage with the main body 22 along the axial direction Y. The rotating member 31 is sleeved on the push rod assembly 40 and is limited to engage with the push rod assembly 40 along the circumferential direction W, and the push rod assembly 40 is configured to be movable relative to the rotating member 31 along the axial direction Y. The clutch member 32 is spaced apart from the rotating member 31. The clutch member 32 is limited to the first limiting portion 111 along the circumferential direction W and is configured to disengage from the first limiting portion 111 under the action of a first external force. The drive mechanism 50 is used to provide a driving force for the clutch member 32 to rotate in the counterclockwise direction W2. The first elastic member 33 is disposed between the rotating member 31 and the clutch member 32, and is used to apply an elastic force to the rotating member 31 along the axial direction Y toward the distal end b relative to the housing assembly 10, so that the main body member 22 can abut against the first limiting structure 122 along the axial direction Y toward the distal end b. The limiting member 20 is configured to move along the axial direction Y toward the proximal end a under the pressure of the vial assembly 200, so that the rotating member 31 and the clutch member 32 are circumferentially limited and engaged.

[0066] Specifically, the outer peripheral wall of the rotating member 31 is provided with the aforementioned first protrusion 311, and the inner peripheral wall of the rotating member 31 is provided with the aforementioned second protrusion 312.

[0067] The first elastic element 33 can be a component with elastic properties, such as a spring, torsion spring, or sheet.

[0068] It should be noted that the initial state of the injection device refers to the initial state in which the syringe assembly 100 and the vial assembly 200 are installed.

[0069] Understandably, when the vial assembly 200 is installed on the fixture 12, such as Figure 4 and Figure 5 As shown in the accompanying drawings, and in conjunction with other figures, the vial 220 of the vial assembly 200 applies pressure along the axial direction Y towards the proximal end a to the limiting member 20, causing the limiting member 20 to move along the axial direction Y towards the proximal end a relative to the housing assembly 10. The rotating member 31 moves along the axial direction Y towards the proximal end a with the limiting member 20, relative to the housing assembly 10 and the push rod assembly 40, causing the rotating member 31 to move along the axial direction Y towards the clutch member 32 and engage with the clutch member 32 in a circumferential W-directed limiting engagement. Thus, in the initial state, the injection device has the clutch member 32 and the housing 11 engaged in a circumferential W-directed limiting engagement, and the rotating member 31 and the clutch member 32 engaged in a circumferential W-directed limiting engagement. Based on this, by driving the clutch 32 to disengage from the first limiting part 111 through the action of the first external force, the clutch 32 can rotate in the counterclockwise direction W2 relative to the housing assembly 10 under the drive of the drive mechanism 50. The rotating part 31 rotates together with the clutch 32 in the counterclockwise direction W2 relative to the housing assembly 10 and the limiting part 20. This causes the push rod assembly 40 to rotate in the counterclockwise direction W2 relative to the limiting part 20 and the housing assembly 10 under the drive of the rotating part 31, so as to move in the axial direction Y towards the distal end b relative to the rotating part 31, the clutch 32, the limiting part 20 and the housing assembly 10, so as to drive the medicine in the medicine bottle assembly 200 and realize the injection of medicine.

[0070] After the medicine in the vial assembly 200 has been injected, the vial assembly 200 can be detached from the fixing member 12. Then, the push rod assembly 40 is rotated clockwise W1 relative to the limiting member 20, so that the push rod assembly 40 moves axially Y towards the proximal end a relative to the limiting member 20 and the housing assembly 10 to reset and retract into the housing assembly 10. During this process, if both the clutch 32 and the rotating member 31 rotate clockwise W1 with the push rod assembly 40, the clutch 32 will not be able to rotate clockwise under the driving action of the driving mechanism 50, thus failing to achieve the clockwise rotation reset of the push rod assembly 40. In this embodiment, when the vial assembly 200 is not installed with the fixing member 12, if Figure 6As shown in the accompanying drawings, and in conjunction with other figures, the pressure applied by the vial assembly 200 to the limiting member 20 along the axial direction Y towards the proximal end a is removed. Under the elastic action of the first elastic member 33, the rotating member 31 moves the limiting member 20 along the axial direction Y towards the distal end b, so that the rotating member 31 and the clutch member 32 are spaced apart. Therefore, the rotating member 31 and the clutch member 32 do not form a circumferential W-shaped limit, and the rotating member 31 can rotate relative to the clutch member 32. Thus, when the rotating member 31 rotates with the push rod assembly 40 in the clockwise direction W1 relative to the housing assembly 10 and the limiting member 20, the clutch member 32 will not rotate with the rotating member 31. This prevents the push rod assembly 40 from failing to rotate in the clockwise direction W1 under the action of the clutch member 32 and the drive mechanism 50, thus achieving a reset. Therefore, the syringe assembly 100 can continue to be used after replacing the vial assembly 200 or the vial 220 within the vial assembly 200, thus giving the syringe assembly 100 a reusable effect.

[0071] Understandably, when the syringe assembly 100 is not equipped with the vial assembly 200, such as Figure 6 As shown in the accompanying drawings, and in conjunction with other figures, the rotating member 31 moves relative to the housing assembly 10 along the axial direction Y towards the distal end b under the elastic action of the first elastic member 33, so that the limiting member 20 moves relative to the housing assembly 10 along the axial direction Y towards the distal end b with the rotating member 31, thereby causing the main body member 22 to elastically abut against the first limiting structure 122 of the fixing member 12 along the axial direction Y towards the distal end b. Specifically, under the elastic action of the first elastic member 33, the main body member 22 elastically abuts against the limiting ring 1221 and the second limiting portion 1222 of the first limiting structure 122 along the axial direction Y towards the distal end b.

[0072] When the vial assembly 200 is installed on the fastener 12, such as Figure 4 and Figure 5 As shown in the figure and in conjunction with other figures, under the pressure of the medicine bottle 220 of the medicine bottle assembly 200, the limiting member 20 can move relative to the housing assembly 10 along the axial direction Y toward the proximal end a. This makes the main body 21 of the limiting member 20 spaced at the proximal end a of the first limiting structure 122 of the fixing member 12, and the main body 21 does not abut against the limiting ring 1221 and the second limiting part 1222 along the axial direction Y toward the distal end b.

[0073] This configuration ensures that when the vial assembly 200 is mounted on the fixing member 12, the rotating member 31 and the clutch member 32 are engaged in a circumferential W-direction limiting fit. When the vial assembly 200 is not mounted on the fixing member 12, the circumferential W-direction limiting fit of the rotating member 31 and the clutch member 32 is released. This allows the push rod assembly 40 to reset and rotate clockwise in the direction W1, thereby resetting and moving axially Y toward the proximal end a.

[0074] In some embodiments, please refer to the following: Figure 13 and Figure 16And in conjunction with other accompanying figures. Figure 16 This is a perspective view of the clutch member 32 of the syringe assembly 100 provided in some embodiments of this application. The inner peripheral wall of the rotating member 31 has a plurality of fourth protrusions 313 arranged circumferentially W, and the outer peripheral wall of the clutch member 32 has a plurality of fifth protrusions 322 arranged circumferentially W. The fourth protrusions 313 are circumferentially W-limited between two adjacent fifth protrusions 322, and the fifth protrusions 322 are circumferentially W-limited between two adjacent fourth protrusions 313. In this way, circumferential W-limiting of the rotating member 31 and the clutch member 32 can be achieved.

[0075] Specifically, such as Figure 13 As shown, the fourth protrusion 313 is spaced along the axial direction Y at the proximal end a of the second protrusion 312.

[0076] In some embodiments, please refer to the following: Figure 7 , Figure 8 and Figure 16 And in conjunction with other accompanying drawings. The inner peripheral wall of the housing 11 is provided with a plurality of first limiting portions 111 arranged along the circumferential direction W, and the outer peripheral wall of the clutch 32 is provided with a plurality of sixth protrusions 323 arranged along the circumferential direction W. The first limiting portions 111 are located between two adjacent sixth protrusions 323 along the circumferential direction W, and the sixth protrusions 323 are located between two adjacent first limiting portions 111 along the circumferential direction W, so that the clutch 32 and the housing 11 are limited along the circumferential direction W.

[0077] Specifically, such as Figure 16 As shown, the sixth protrusion 323 is provided along the axial direction Y at the proximal end a of the fifth protrusion 322.

[0078] In some embodiments, please refer to the following: Figure 6 , Figure 11 and Figure 13 And in conjunction with other accompanying figures. Figure 13 This is a perspective view of the rotating component 31 of the syringe assembly 100 provided in some embodiments of this application. The main body 22 is sleeved on the clutch assembly 30. The inner peripheral wall of the main body 22 is provided with a limiting groove 201, and the outer peripheral wall of the clutch assembly 30 is provided with a first protrusion 311, which is limited in the limiting groove 201 along the axial direction Y.

[0079] Understandably, the limiting groove 201 is an annular groove provided on the inner peripheral wall of the main body 22. As an example, the first protrusion 311 may be an annular protrusion provided on the outer peripheral wall of the clutch assembly 30.

[0080] The first protrusion 311 is radially inserted into the limiting groove 201, thereby limiting the first protrusion 311 within the limiting groove 201 along the axial direction Y. Here, radial refers to the radius direction, which is perpendicular to the circumferential direction W and the axial direction Y.

[0081] The first protrusion 311 is positioned axially Y-shaped within the limiting groove 201, thereby creating an axial Y-shaped limit between the limiting member 20 and the clutch assembly 30. When the clutch assembly 30 rotates relative to the main body 22, the first protrusion 311 rotates along the limiting groove 201.

[0082] By inserting the first protrusion 311 into the limiting groove 201, the waterproof effect between the clutch assembly 30 and the limiting member 20 can be improved, and the liquid can be prevented from entering the housing assembly 10 through the gap between the clutch assembly 30 and the limiting member 20, thereby helping to improve the waterproof effect of the syringe assembly 100.

[0083] Specifically, the limiting groove 201 and the first thread 212 are spaced apart along the axial direction Y, and the limiting groove 201 is spaced apart at the proximal end a of the first thread 212.

[0084] In some embodiments, please refer to the following: Figures 13 to 15 And in conjunction with other accompanying figures. Figure 14 This is a perspective view of the plunger assembly 40 and the rotating member 31 of the syringe assembly 100 provided in some embodiments of this application. Figure 15 This is a perspective view of the plunger assembly 40 of the syringe assembly 100 provided in some embodiments of this application. The outer peripheral wall of the plunger assembly 40 is provided with a first groove 401, which extends along the axial direction Y. The inner peripheral wall of the clutch assembly 30 is provided with a second protrusion 312, which is circumferentially confined within the first groove 401 and is capable of sliding along the first groove 401 in the axial direction Y.

[0085] The second protrusion 312 is circumferentially W-limited within the first slide groove 401 to achieve circumferential W-limitation of the clutch assembly 30 and the push rod assembly 40.

[0086] When the clutch assembly 30 rotates relative to the housing assembly 10, the clutch assembly 30 can drive the push rod assembly 40 to rotate together relative to the housing assembly 10 and the limiting member 20, and the first groove 401 on the push rod assembly 40 slides along the second protrusion 312 in the axial Y direction, thereby allowing the push rod assembly 40 to move relative to the clutch assembly 30 and the limiting member 20 in the axial Y direction.

[0087] The second protrusion 312 is inserted into the first groove 401, that is, the second protrusion 312 is inserted into the push rod assembly 40, so that the second protrusion 312 can be used to block external liquid and reduce the gap between the push rod assembly 40 and the clutch assembly 30. This can improve the problem of liquid entering the housing assembly 10 from between the push rod assembly 40 and the clutch assembly 30 and improve the waterproof effect of the syringe assembly 100.

[0088] Specifically, such as Figure 15As shown, the first slide groove 401 is configured such that the first threaded groove 402 is disconnected, that is, the first slide groove 401 and the first threaded groove 402 are connected.

[0089] In some embodiments, please refer to the following: Figures 3 to 5 , Figure 9 And in conjunction with other accompanying drawings. The injection device also includes a third limiting structure 13. The third limiting structure 13 is disposed on the housing 11, specifically, the third limiting structure 13 may be disposed at the proximal end a of the housing 11 along the axial direction Y. The drive mechanism 50 includes an adjusting component 51, a numerical rotating cylinder 52, and a second elastic element 53. The adjusting component 51 is rotatably disposed inside the housing 11 and sleeved outside the push rod assembly 40. The adjusting component 51 is limited to the clutch assembly 30 in the counterclockwise direction W2, and is also configured to rotate relative to the clutch assembly 30 under the action of a second external force. It can be understood that in the initial state of the injection device, the adjusting component 51 is limited to the clutch assembly 30 in the counterclockwise direction, that is, the clutch assembly 30 limits the rotation of the adjusting component 51 in the counterclockwise direction W2, so that the adjusting component 51 will not rotate relative to the clutch assembly 30 in the counterclockwise direction W2. When the clutch assembly 30 disengages from the first limiting part 111 and the adjusting assembly 51 rotates counterclockwise W2 relative to the housing assembly 10, the clutch assembly 30 can rotate counterclockwise W2 relative to the housing assembly 10 along with the adjusting assembly 51. When the adjusting assembly 51 is subjected to a second external force, the adjusting assembly 51 can rotate relative to the clutch assembly 30 and the housing assembly 10. Specifically, when the adjusting assembly 51 is subjected to a second external force, the adjusting assembly 51 can rotate clockwise W1 relative to the clutch assembly 30 and the housing assembly 10, or it can rotate counterclockwise W2 relative to the clutch assembly 30 and the housing assembly 10.

[0090] The adjusting component 51 is spaced out from the push rod assembly 40, so that the adjusting component 51 can rotate relative to the push rod assembly 40, and the push rod assembly 40 can move relative to the adjusting component 51.

[0091] The numerical rotating cylinder 52 is threadedly connected inside the housing 11. The numerical rotating cylinder 52 is sleeved around the adjusting assembly 51 and is circumferentially limited on the adjusting assembly 51. The numerical rotating cylinder 52 is configured to move axially relative to the housing assembly 10 and the adjusting assembly 51 relative to the adjusting assembly 51 as the adjusting assembly 51 rotates, thereby adjusting the scale. Understandably, when the adjusting assembly 51 rotates relative to the housing assembly 10, the numerical rotating cylinder 52 rotates with the adjusting assembly 51 relative to the housing assembly 10 under the circumferential W-limiting action of the adjusting assembly 51, and the numerical rotating cylinder 52 also moves axially relative to the housing assembly 10 and the adjusting assembly 51 under the limiting action of the housing assembly 10 and the adjusting assembly 51, thereby adjusting the position of the numerical rotating cylinder 52 in the axial Y direction to achieve scale adjustment. Specifically, when the adjusting assembly 51 rotates relative to the housing assembly 10 in the counterclockwise direction W2 or in the clockwise direction W1, the numerical rotating cylinder 52 can move axially relative to the housing assembly 10 and the adjusting assembly 51. As an example, such as... Figure 9 As shown, the third limiting structure 13 described below is located at the proximal end a of the numerical rotating cylinder 52. When the adjusting component 51 rotates clockwise W1 relative to the housing assembly 10, the numerical rotating cylinder 52 rotates clockwise W1 with the adjusting component 51 and moves axially Y toward the distal end b relative to the housing assembly 10 and the adjusting component 51; when the adjusting component 51 rotates counterclockwise W2 relative to the housing assembly 10, the numerical rotating cylinder 52 rotates counterclockwise W2 with the adjusting component 51 and moves axially Y toward the proximal end a relative to the housing assembly 10 and the adjusting component 51.

[0092] The second elastic element 53 is connected between the housing assembly 10 and the adjusting assembly 51. The second elastic element 53 is configured to provide the adjusting assembly 51 with an elastic force that rotates counterclockwise in the direction W2, causing the numerical cylinder 52 to be confined counterclockwise in the direction W2 onto the third limiting structure 13 on the housing 11. Understandably, in the initial state, the numerical cylinder 52 is confined counterclockwise in the direction W2 onto the third limiting structure 13. When the numerical cylinder 52 is not confined counterclockwise in the direction W2 onto the third limiting structure 13, and the clutch assembly 30 disengages from the first limiting portion 111, the second elastic element 53 can drive the adjusting assembly 51 to rotate counterclockwise in the direction W2 relative to the housing assembly 10, causing the numerical cylinder 52 to rotate counterclockwise in the direction W2 onto the third limiting structure 13. When the numerical cylinder 52 is confined counterclockwise in the direction W2 onto the third limiting structure 13, the adjusting assembly 51 cannot continue to rotate counterclockwise in the direction W2. The second elastic element 53 can be a torsion spring, spring, sheet, or other component with elastic force.

[0093] It should be noted that when the adjusting component 51 rotates clockwise W1 relative to the housing assembly 10 and the clutch assembly 30 by a predetermined angle under the action of the second external force, the numerical rotating cylinder 52 rotates clockwise W1 relative to the housing assembly 10 by the predetermined angle, and moves a predetermined numerical stroke relative to the housing assembly 10 and the adjusting component 51 along the axial direction Y, thereby displaying a predetermined scale. When the clutch assembly 30 disengages from the first limiting part 111 under the action of the first external force, the adjusting component 51 rotates counterclockwise W2 relative to the housing assembly 10 by the predetermined angle under the driving action of the second elastic member 53. The numerical rotating cylinder 52 rotates counterclockwise W2 relative to the housing assembly 10 by the predetermined angle, and moves a predetermined numerical stroke relative to the housing assembly 10 and the adjusting component 51 along the axial direction Y, so that the position of the numerical rotating cylinder 52 returns to the initial state. It can be considered that the scale displayed by the numerical rotating cylinder 52 returns to 0, that is, returns to the initial state. As the adjusting assembly 51, the clutch assembly 30 and the push rod assembly 40 rotate together in the counterclockwise direction W2 relative to the limiting member 20 and the housing assembly 10 by the predetermined angle, and the push rod assembly 40 moves along the axial direction Y towards the distal end b relative to the limiting member 20 and the housing assembly 10 for a predetermined injection stroke. Therefore, the predetermined angle, predetermined scale, predetermined numerical stroke and predetermined injection stroke are set correspondingly, so that the scale displayed by the numerical rotary cylinder 52 can be used to represent a single injection stroke of the push rod assembly 40.

[0094] Based on the above structure, the working principle of the injection device is as follows: In its initial state, the injection device has the vial assembly 200 mounted on the housing assembly 10. The clutch assembly 30 is circumferentially limited to the first limiting part 111, the adjusting assembly 51 is counterclockwise limited to the clutch assembly 30, and the numerical rotating cylinder 52 is counterclockwise limited to the third limiting structure 13, so that the scale displayed by the numerical rotating cylinder 52 is 0. Under the pressure of the vial assembly 200, the rotating part 31 and the clutch assembly 32 are engaged circumferentially.

[0095] When the injection device is in use, a second external force is first applied to drive the adjusting component 51 to rotate clockwise (W1) relative to the housing assembly 10 and the clutch assembly 30. Based on the circumferential (W) limiting engagement between the adjusting component 51 and the numerical rotating cylinder 52, the numerical rotating cylinder 52 rotates clockwise (W1) relative to the housing assembly 10 and the clutch assembly 30, thereby causing the numerical rotating cylinder 52 to move axially (Y) relative to the housing assembly 10 and the adjusting component 51 to display the scale, thus achieving scale adjustment of the injection device. Since the clutch assembly 30 is circumferentially (W) limited on the first limiting part 111, and the adjusting component 51 is counterclockwise (W2) limited on the clutch assembly 30, after the second external force is removed and no first external force is applied, the adjusting component 51 cannot rotate counterclockwise (W2) relative to the housing assembly 10 under the driving force of the second elastic element 53.

[0096] Then, the clutch assembly 30 is driven to disengage from the first limiting part 111 by the first external force. Under the driving force of the second elastic member 53, the adjusting assembly 51 rotates in the counterclockwise direction W2 relative to the housing assembly 10. Based on the fact that the adjusting assembly 51 is limited to the clutch assembly 30 in the counterclockwise direction W2, and the clutch assembly 30 and the push rod assembly 40 are limited in the circumferential direction W, the numerical rotating cylinder 52 and the clutch assembly 30 rotate in the counterclockwise direction W2 relative to the housing assembly 10 with the adjusting assembly 51, and the push rod assembly 40 rotates in the counterclockwise direction W2 relative to the limiting member 20 and the housing assembly 10 with the clutch assembly 30. That is, under the driving force of the second elastic member 53, the adjusting assembly 51, the numerical rotating cylinder 52, the clutch assembly 30 and the push rod assembly 40 rotate together in the counterclockwise direction W2 relative to the limiting member 20 and the housing assembly 10. During this process, the push rod assembly 40 moves axially Y towards the distal end b relative to the limiting member 20, the housing assembly 10, the adjusting assembly 51, and the clutch assembly 30 to drive the medicine in the vial assembly 200. Under the driving force of the second elastic member 53, when the numerical rotating cylinder 52 rotates counterclockwise W2 relative to the housing assembly 10 with the adjusting assembly 51 until it is limited on the third limiting structure 13, the numerical rotating cylinder 52 stops rotating counterclockwise W2 relative to the housing assembly 10, causing the adjusting assembly 51, the clutch assembly 30, the numerical rotating cylinder 52, and the push rod assembly 40 to all stop rotating counterclockwise W2, thereby completing a single injection of the medicine.

[0097] It should be further explained that during the scale adjustment of the injection device, a second external force can be used to drive the adjusting component 51 to rotate clockwise W1 relative to the housing assembly 10 and the clutch assembly 30, or a second external force can be used to drive the adjusting component 51 to rotate counterclockwise W2 relative to the housing assembly 10 and the clutch assembly 30. This helps to improve the positional accuracy of the numerical cylinder 52 in the axial Y direction, thereby improving the accuracy of the scale displayed by the numerical cylinder 52. Specifically, during the scale adjustment of the injection device, since the numerical cylinder 52 is limited to the third limiting structure 13 in the counterclockwise W2 direction, it is necessary to first drive the adjusting component 51 to rotate clockwise W1, and then drive the adjusting component 51 to rotate counterclockwise W2, in order to achieve accurate adjustment of the position of the numerical cylinder 52.

[0098] It should be noted that the liquid in the vial assembly 200 can be used for a single injection or for multiple injections.

[0099] When the medicine in the vial assembly 200 is used for a single injection, during the scale adjustment of the injection device, the adjustment assembly 51 can be driven by a second external force to rotate clockwise W1 relative to the housing assembly 10 and the clutch assembly 30 until the memory element 90 is limited to the third limiting structure 13 of the push rod assembly 40 in the clockwise direction W1. At this time, the scale displayed on the numerical rotary cylinder 52 is at its maximum. Thus, during the injection of the medicine, when the clutch assembly 30 is driven to disengage from the first limiting part 111 by the first external force, under the drive of the second elastic element 53, the adjusting assembly 51, the numerical rotating cylinder 52, the clutch assembly 30, and the push rod assembly 40 rotate together in the counterclockwise direction W2 relative to the limiting part 20 and the housing assembly 10 until the numerical rotating cylinder 52 is limited in the counterclockwise direction W2 on the third limiting structure 13. At this time, the push rod assembly 40 moves to the maximum distance b along the axial direction Y relative to the limiting part 20 and the housing assembly 10, and it can be considered that the medicine in the vial assembly 200 has been injected. In this way, the effect of injecting the medicine in the vial assembly 200 in one go can be achieved.

[0100] When the liquid in the vial assembly 200 is used for multiple injections, the injection needle 300 is detachably installed inside the vial assembly 200. To determine the required dosage, a second external force is applied to drive the adjusting assembly 51 to rotate clockwise (W1) relative to the housing assembly 10 and the clutch assembly 30 by a predetermined angle. This causes the numerical rotating cylinder 52 to move a predetermined numerical stroke relative to the housing assembly 10 and the adjusting assembly 51 along the axial direction (Y) to display a predetermined scale, thus achieving scale adjustment. Then, a first external force is applied to drive the clutch assembly 30 to disengage from the first limiting part 111. Under the drive of the second elastic member 53, the numerical rotating cylinder 52 moves along the axial direction (Y) relative to the housing assembly 10 and the adjusting assembly 51 to reset, setting the scale to 0. The push rod assembly 40 moves along the axial direction (Y) towards the distal end (b) relative to the limiting member 20 and the housing assembly 10 by a predetermined injection stroke, thus injecting the predetermined dosage of liquid into the vial assembly 200. Then, the injection needle 300 is replaced, and the required dosage of medicine is injected again. The second external force is used to drive the adjustment component 51 to rotate clockwise W1 relative to the housing component 10 and the clutch component 30 by a predetermined angle. Then, the first external force is used to drive the clutch component 30 to disengage from the first limiting part 111, so as to realize the injection of the predetermined dosage of medicine again... and so on, so that multiple injections of medicine in the medicine bottle component 200 can be realized.

[0101] Once the medication in the vial assembly 200 has been injected, the vial assembly 200 can be detached from the housing assembly 10. The plunger assembly 40 is then rotated clockwise W1 relative to the limiting member 20 and the housing assembly 10, causing the plunger assembly 40 to return to its original position along the axial direction Y towards the proximal end a within the housing assembly 10. Then, the vial assembly 200 or the vial 220 of the vial assembly 200 is replaced, and the injection needle 300 is also replaced, enabling the syringe assembly 100 to be reused.

[0102] This design allows the injection device to be scaled and then injected with a predetermined dose of medicine according to the adjusted scale, which facilitates single or multiple injections of medicine.

[0103] In some embodiments, please refer to the following: Figure 7 , Figure 8 , Figure 17 and Figure 18 And in conjunction with other accompanying figures. Figure 17 This is a perspective view of the numerical rotating cylinder 52 of the syringe assembly 100 provided in some embodiments of this application. Figure 18This is a perspective view of the adjustment component 51 of the syringe assembly 100 provided in some embodiments of this application. The outer peripheral wall of the numerical rotating cylinder 52 is provided with a second threaded groove 504, and the inner peripheral wall of the housing assembly 10 is provided with a second thread 112. The second threaded groove 504 and the second thread 112 are threadedly engaged so that the numerical rotating cylinder 52 can move along the axial direction Y when it rotates relative to the housing assembly 10.

[0104] The outer peripheral wall of the adjusting component 51 is provided with a rib 51122, and the inner peripheral wall of the numerical rotating cylinder 52 is provided with a second sliding groove 505. The rib 51122 is limited to the second sliding groove 505 along the circumferential direction W, and the rib 51122 can move along the axial direction Y in the second sliding groove 505, so that when the numerical rotating cylinder 52 rotates with the adjusting component 51 relative to the housing component 10, the numerical rotating cylinder 52 can move along the axial direction Y relative to the housing component 10 and the adjusting component 51.

[0105] Specifically, the inner peripheral wall of the housing 11 is provided with the aforementioned second thread 112, and the second thread 112 is located at the proximal end a of the first limiting portion 111.

[0106] In some embodiments, please refer to Figure 3 And in conjunction with other accompanying drawings. The numerical rotating cylinder 52 is provided with a scale, and the housing assembly 10 is provided with a window 101, which is used to display the scale on the numerical rotating cylinder 52. In the operation of adjusting the scale of the injection device, by adjusting the position of the numerical rotating cylinder 52 in the axial Y direction, different scales on the numerical rotating cylinder 52 can be aligned with the window 101, so that the window 101 displays different scales.

[0107] In some embodiments, please refer to the following: Figure 3 , Figure 4 and Figure 9 In conjunction with other accompanying drawings, the injection device also includes a knob 60, which is rotatably mounted on the housing 11 and engages with the adjustment assembly 51 in a circumferential W-direction limiting manner.

[0108] Thus, the second external force acts as a rotational operation on the knob 60. Specifically, when the knob 60 is rotated, the adjustment component 51 can rotate relative to the housing assembly 10 and the clutch assembly 30 under the drive of the knob 60.

[0109] In some embodiments, please refer to the following: Figure 3 , Figure 4 and Figure 9And in conjunction with other accompanying drawings. The injection device also includes a button 70, which is movably disposed on the housing 11 along the Y-axis, and the button 70 abuts against the adjustment assembly 51 at its distal end b along the Y-axis. The adjustment assembly 51 is disposed at the proximal end a of the clutch assembly 30. Thus, the first external force acts as a pressing operation on the button 70 at its distal end b along the Y-axis. By pressing the button 70 towards the distal end b, the adjustment assembly 51 can drive the clutch 32 to move along the distal end b along the Y-axis, causing the clutch 32 to disengage from the first limiting part 111.

[0110] It should be further explained that when the button 70 is pressed toward the distal end b, the adjusting component 51, under the action of the button 70, squeezes the clutch 32 toward the distal end b along the axial direction Y, so that both the first elastic element 33 and the second elastic element 53 store force.

[0111] When the first external force is removed, the clutch 32 can move along the axial direction Y toward the proximal end a under the elastic action of the first elastic member 33, and form a limit with the first limiting part 111 along the circumferential direction W. Furthermore, the adjusting assembly 51 moves back to its original position along the axial direction Y toward the proximal end a under the pushing action of the clutch 32.

[0112] When the first external force is removed, the adjusting component 51 will also move back to its original position along the axial direction Y towards the proximal end a under the elastic force of the second elastic element 53.

[0113] In some embodiments, please refer to the following: Figure 3 , Figure 4 and Figure 9 And in conjunction with other accompanying drawings. The injection device also includes a third elastic element 80, which presses against the button 70 and the housing assembly 10. When the first external force is removed, the button 70 can be reset along the axial direction Y towards the proximal end a.

[0114] In some embodiments, the button 70 is engaged with the adjustment component 51 so that when the first external force is removed and the button 70 moves to reset along the axial direction Y toward the proximal end a, the adjustment component 51 can also move to reset along the axial direction Y toward the proximal end a under the action of the button 70.

[0115] In some embodiments, please refer to Figure 16 In conjunction with other accompanying drawings, the clutch assembly 30 has a plurality of ratchet teeth 321 arranged circumferentially along the Y direction at one end near the proximal end a, and the ratchet teeth 321 are inclined in the clockwise direction W1.

[0116] Understandably, in the axial direction Y, the adjustment component 51 is located at the proximal end a of the clutch component 30.

[0117] Understandably, ratchet teeth 321 are located at one end of the clutch member 32 along the axial direction Y towards the proximal end a. Specifically, ratchet teeth 321 are located at the proximal ends a of the fifth protrusion 322 and the sixth protrusion 323.

[0118] In some embodiments, please refer to the following: Figure 3 , Figure 4 , Figure 16 and Figure 18 And in conjunction with other accompanying drawings. The adjustment assembly 51 includes an adjustment body 511 and an elastic tooth 512. The adjustment body 511 is rotatably disposed within the housing 11, and is located at the proximal end a of the clutch assembly 30. The adjustment body 511 is spaced out of the push rod assembly 40, such that the adjustment body 511 can rotate relative to the push assembly, and the push rod assembly 40 can move axially Y relative to the adjustment body 511. The numerical rotating cylinder 52 is sleeved outside the adjustment body 511, the adjustment body 511 is connected to the second elastic member 53, and the adjustment body 511 and the numerical rotating cylinder 52 are circumferentially limited in fit. The elastic tooth 512 is disposed on the adjustment body 511 and extends out of the adjustment body 511 distally b. The elastic tooth 512 elastically engages between two adjacent ratchet teeth 321, and is limited to the ratchet teeth 321 in a counterclockwise direction W2. The elastic tooth 512 is used to move elastically relative to the ratchet tooth 321 in the clockwise direction W1 under the action of the second external force, and is also used to move elastically relative to the ratchet tooth 321 in the counterclockwise direction W2 under the action of the second external force.

[0119] Understandably, in the initial state, the elastic tooth 512 engages between two adjacent ratchet teeth 321 and is limited to the ratchet teeth 321 in the counterclockwise direction W2. Thus, when the adjusting component 51 is not subjected to a second external force, the elastic tooth 512 is limited to the ratchet teeth 321 in the counterclockwise direction W2, thereby preventing the adjusting component 51 from rotating relative to the clutch component 30 in the counterclockwise direction W2.

[0120] When the adjusting component 51 rotates clockwise W1 relative to the housing component 10 under the action of the second external force, the adjusting body 511 rotates clockwise W1 relative to the housing component 10, and the elastic tooth 512 moves clockwise W1 under the drive of the adjusting body 511 and elastically deforms relative to the ratchet tooth 321, so that the elastic tooth 512 moves elastically relative to the ratchet tooth 321 in the clockwise W1 direction, that is, the adjusting component 51 rotates clockwise W1 relative to the clutch component 30.

[0121] In this way, the adjusting component 51 can rotate clockwise W1 relative to the clutch component 30 under the action of the second external force, thereby realizing the scale adjustment work.

[0122] Furthermore, the adjusting component 51 can also rotate counterclockwise W2 relative to the housing assembly 10 and the clutch assembly 30 under the action of a second external force, thereby realizing the movement of the numerical rotating cylinder 52 in the axial Y direction to achieve scale adjustment. This helps to improve the accuracy of scale adjustment of the injection device.

[0123] In some embodiments, please refer to the following: Figure 19 and Figure 20 And in conjunction with other accompanying figures. Figure 19 Three-dimensional structure of the first adjusting member 5111 of the syringe assembly 100 provided in some embodiments of this application Figure 1 , Figure 20 This is a perspective view of the second adjusting member 5112 and the elastic tooth 512 of the syringe assembly 100 provided in some embodiments of this application. The adjusting body 511 includes a first adjusting member 5111 and a second adjusting member 5112. The first adjusting member 5111 is rotatably disposed within the housing 11 and spaced outside the push rod assembly 40, such that the first adjusting member 5111 can rotate relative to the push rod assembly 40, and the push rod assembly 40 can also move relative to the push rod assembly 40 along the axial direction Y. The second adjusting member 5112 is sleeved on the first adjusting member 5111. The elastic tooth 512 is disposed on the second adjusting member 5112, the second adjusting member 5112 is connected to the second elastic member 53, and a numerical sleeve is sleeved on the second adjusting member 5112 and is limitedly engaged with the second adjusting member 5112 along the circumferential direction W. One of the first adjusting member 5111 and the second adjusting member 5112 is provided with a buckle 51121, and the other is provided with a groove 501. The latch 51121 is confined within the slot 501 along the circumferential direction W and the axial direction Y. In the circumferential direction W, the size of the slot 501 is larger than the size of the latch 51121. The first adjusting member 5111 is configured such that when it rotates counterclockwise W2 relative to the second adjusting member 5112 under the action of a second external force, it drives the elastic tooth 512 to move elastically away from the ratchet tooth 321.

[0124] In some possible designs, such as Figure 19 and Figure 20 As shown, the first adjusting member 5111 is provided with the aforementioned slot 501, and the second adjusting member 5112 is provided with the aforementioned buckle 51121. In some other possible designs, the first adjusting member 5111 is provided with the aforementioned buckle 51121, and the second adjusting member 5112 is provided with the aforementioned slot 501.

[0125] The buckle 51121 is engaged in the slot 501 so that the first adjusting member 5111 and the second adjusting member 5112 can achieve circumferential W-direction and axial Y-direction.

[0126] Understandably, the slot 501 has inner walls at both ends along the circumferential direction W, so that the buckle 51121 is limited to the inner walls at both ends of the slot 501 along the circumferential direction W, thereby achieving circumferential W-limiting of the buckle 51121 and the slot 501. When the second adjusting member 5112 rotates relative to the housing assembly 10, the buckle 51121 can rotate between the inner walls at both ends of the slot 501 along the circumferential direction W until the buckle 51121 abuts against the inner wall at either end of the slot 501 along the circumferential direction W.

[0127] For ease of description, the inner walls at both ends of the slot 501 along the circumferential direction W are defined as the first inner wall (not shown in the figure) and the second inner wall (not shown in the figure).

[0128] With this configuration, when the first adjusting member 5111 rotates clockwise W1 relative to the housing assembly 10 under the action of a second external force, the latch 51121 abuts against the first inner wall of the slot 501 along the circumferential W direction, causing the first adjusting member 5111 to drive the second adjusting member 5112 to rotate clockwise W1. The elastic tooth 512 moves elastically along the ratchet tooth 321 clockwise W1, thereby causing the first adjusting member 5111 and the second adjusting member 5112 to rotate clockwise W1 relative to the housing assembly 10 and the clutch assembly 30. The numerical rotating cylinder 52 rotates clockwise W1 with the second adjusting member 5112 and moves axially Y relative to the housing assembly 10 and the adjusting assembly 51.

[0129] When the first adjusting member 5111 rotates counterclockwise W2 relative to the housing assembly 10 under the action of the second external force, the first adjusting member 5111 will first rotate a certain angle counterclockwise W2 relative to the second adjusting member 5112. Specifically, the latch 51121 rotates a certain angle circumferentially W within the slot 501 until the latch 51121 abuts against the second inner wall of the slot 501 circumferentially W. When the latch 51121 rotates circumferentially W within the slot 501, the first adjusting member 5111 drives the elastic tooth 512 to move elastically away from the ratchet tooth 321 when rotating counterclockwise W2 relative to the second adjusting member 5112, thereby reducing the meshing depth between the elastic tooth 512 and the ratchet tooth 321, which is beneficial for the elastic tooth 512 to move elastically relative to the ratchet tooth 321. After the buckle 51121 rotates a certain angle in the slot 501 along the circumferential direction W, it abuts against the second inner wall of the slot 501 along the circumferential direction W. This allows the first adjusting member 5111 to continue rotating under the action of the second external force, which can drive the second adjusting member 5112 to rotate in the counterclockwise direction W2. The elastic tooth 512 on the second adjusting member 5112 can move elastically relative to the ratchet tooth 321 in the counterclockwise direction W2, thereby causing the adjusting assembly 51 to rotate in the counterclockwise direction W2 relative to the housing assembly 10 and the clutch assembly 30.

[0130] Therefore, under the action of the second external force, the adjusting component 51 can rotate clockwise W1 relative to the housing assembly 10 and the clutch assembly 30, or counterclockwise W2 relative to the housing assembly 10 and the clutch assembly 30, thereby realizing the movement of the numerical rotating cylinder 52 in the axial Y direction to achieve scale adjustment. This helps to improve the accuracy of scale adjustment of the injection device.

[0131] It should be noted that the elastic tooth 512 has elastic properties. When the second external force is removed, the elastic tooth 512 can move back towards the ratchet tooth 321 to engage between two adjacent ratchet teeth 321.

[0132] It should also be noted that when the second external force is removed, the second adjusting member 5112 can rotate counterclockwise W2 relative to the housing assembly 10 under the elastic action of the second elastic member 53. The second adjusting member 5112 can also rotate a certain angle relative to the first adjusting member 5111 in the counterclockwise W2 direction. Specifically, the latch 51121 rotates a certain angle circumferentially W within the slot 501 until the latch 51121 abuts against the first inner wall of the slot 501 in the circumferential W direction. Thus, when the first adjusting member 5111 rotates clockwise W1 relative to the housing assembly 10, the latch 51121 abuts against the first inner wall, allowing the first adjusting member 5111 to drive the second adjusting member 5112 to rotate clockwise W1 together, thereby accurately achieving scale adjustment. When the adjusting component 51 is subjected to the first external force, under the elastic action of the second elastic element 53, the second adjusting component 5112 can drive the first adjusting component 5111 to rotate together in the counterclockwise direction W2, so as to accurately realize the injection of medicine.

[0133] Specifically, such as Figure 18 and Figure 20 The outer peripheral wall of the second adjusting member 5112 is provided with ribs 51122.

[0134] In some embodiments, based on the fact that the size of the slot 501 is larger than the size of the buckle 51121 in the circumferential direction W, the rotation angle of the first adjusting member 5111 relative to the second adjusting member 5112 can be less than 15°.

[0135] In some embodiments, the knob 60 is circumferentially limited to the first adjusting member 5111.

[0136] In some embodiments, button 70 is snapped onto the first adjusting member 5111 and abuts against the first adjusting member 5111 at the distal end b along the axial direction Y.

[0137] In some embodiments, please refer to the following: Figures 18 to 22 And in conjunction with other accompanying figures. Figure 21Three-dimensional structure of the first adjusting member 5111 of the syringe assembly 100 provided in some embodiments of this application Figure 2 , Figure 22 for Figure 21 Enlarged view at point C. The first adjusting member 5111 includes a first adjusting part 51111 and a second adjusting part 51112. The second adjusting member 5112 is sleeved outside the first adjusting part 51111. One of the first adjusting part 51111 and the second adjusting member 5112 is provided with a buckle 51121, and the other is provided with a groove 501. The second adjusting part 51112 is located at the distal end b along the axial direction Y of the first adjusting part 51111. The second adjusting part 51112 is provided with a relief groove 502 extending through along the axial direction Y. The elastic tooth 512 extends out of the relief groove 502 along the axial direction Y towards the distal end b. The groove wall of the relief groove 502 is provided with a guide surface 503. The guide surface 503 is configured to compress the elastic tooth 512 when the first adjusting part 51111 rotates in the counterclockwise direction W2 relative to the second adjusting member 5112, so that the elastic tooth 512 moves elastically away from the ratchet tooth 321.

[0138] Understandably, in the initial state, the elastic tooth 512 extends out of the clearance groove 502 along the axial direction Y toward the distal end b, so that the elastic tooth 512 can mesh between two adjacent ratchet teeth 321.

[0139] The elastic tooth 512 and the guide surface 503 of the slot 501 are arranged in a clockwise direction W1. Thus, when the first adjusting member 5111 rotates counterclockwise relative to the housing assembly 10 under the action of a second external force, the first adjusting member 5111 can rotate a certain angle relative to itself in the counterclockwise direction W2. Specifically, the latch 51121 rotates a certain angle circumferentially W within the slot 501. During this process, the guide surface 503 rotates counterclockwise relative to the elastic tooth 512, causing the elastic tooth 512 to elastically move onto the guide surface 503. Guided by the guide surface 503, the elastic tooth 512 can then elastically move away from the ratchet tooth 321, causing at least a portion of the elastic tooth 512 to retract into the slot 501. Thus, after the buckle 51121 rotates a certain angle in the slot 501 along the circumferential direction W, when the buckle 51121 abuts against the second inner wall of the slot 501 along the circumferential direction W, the first adjusting member 5111 drives the second adjusting member 5112 to rotate in the counterclockwise direction W2, thereby causing the adjusting component 51 to rotate in the counterclockwise direction W2 relative to the housing component 10 and the clutch component 30 for scale adjustment.

[0140] This configuration allows the adjusting component 51 to rotate counterclockwise W2 relative to the housing component 10 and the clutch component 30 under the action of a second external force.

[0141] It should be noted that when the second external force is removed, the elastic tooth 512 elastically resets along the guide surface 503, so that it extends out of the slot 501 along the axial direction Y toward the distal end b, and meshes between the two adjacent ratchet teeth 321.

[0142] The guide surface 503 can be either an arc-shaped surface or an inclined surface.

[0143] Specifically, the knob 60 is circumferentially limited to the first adjusting part 51111 of the first adjusting member 5111. The button 70 is axially positioned at the distal end b against the first adjusting part 51111 and is engaged with the first adjusting part 51111.

[0144] In some embodiments, please refer to the following: Figures 3 to 5 The injection device also includes a memory element 90, which is sleeved around and threadedly connected to the push rod assembly 40, such that when the memory element 90 rotates relative to the push rod assembly 40, it moves along the axial direction Y relative to the push rod assembly 40. An adjustment assembly 51 is sleeved around the memory element 90, and the memory element 90 is circumferentially confined within the adjustment assembly 51 and is movable along the axial direction Y relative to the adjustment assembly 51. The memory element 90 is configured such that when it rotates clockwise W1 relative to the push rod assembly 40, it moves along the axial direction Y towards its proximal end a relative to the push rod assembly 40. The push rod assembly 40 has a fourth limiting portion (not shown), located at the proximal end a of the memory element 90. The fourth limiting portion limits the clockwise rotational stroke of the memory element 90 relative to the push rod assembly 40.

[0145] Understandably, during scale adjustment, when the adjusting component 51 rotates clockwise (W1) relative to the housing assembly 10 and the clutch assembly 30 under the action of a second external force, the memory element 90 rotates clockwise (W1) with the adjusting component 51 relative to the housing assembly 10, the clutch assembly 32, and the push rod assembly 40, causing the memory element 90 to move along the axial direction Y towards the proximal end a relative to the push rod assembly 40, the clutch assembly 30, the adjusting component 51, and the housing assembly 10. When the adjusting component 51 rotates counterclockwise (W2) relative to the housing assembly 10 and the clutch assembly 30 under the action of a second external force, the memory element 90 rotates counterclockwise (W2) with the adjusting component 51 relative to the housing assembly 10, the clutch assembly 32, and the push rod assembly 40, causing the memory element 90 to move along the axial direction Y towards the distal end b relative to the push rod assembly 40, the clutch assembly 30, the adjusting component 51, and the housing assembly 10.

[0146] During injection, when the adjusting component 51 moves relative to the housing assembly 10 along the axial direction Y towards the distal end b under the action of the first external force, the clutch 32 moves relative to the housing assembly 10 under the driving action of the adjusting component 51 to disengage from the first limiting part 111. Under the elastic action of the second elastic member 53, the adjusting component 51 drives the clutch component 30 to rotate in the counterclockwise direction W2. The push rod assembly 40 rotates with the clutch component 30 in the counterclockwise direction W2 relative to the limiting member 20 and the housing assembly 10. The memory unit 90 rotates with the adjusting component 51 in the counterclockwise direction W2 relative to the housing assembly 10. That is, the adjusting component 51, the memory unit 90, the clutch 32 and the push rod assembly 40 rotate together in the counterclockwise direction W2 relative to the housing assembly 10 and the limiting member 20, so that the push rod assembly 40 moves relative to the limiting member 20 and the housing assembly 10 along the axial direction Y towards the distal end b to drive the medicine in the vial assembly 200. At this time, the memory element 90 moves along the axial direction Y towards the far end b along with the push rod assembly 40.

[0147] After the medicine in the vial assembly 200 has been injected, the vial assembly 200 is detached from the housing assembly 10. At this time, the pressure of the vial assembly 200 on the limiting member 20 is removed, and the rotating member 31, under the elastic action of the first elastic member 33, drives the limiting member 20 to move distally to the end b along the axial direction Y, so as to disengage from the clutch member 32. Based on this, the push rod assembly 40 can be rotated relative to the housing assembly 10 and the limiting member 20 in the clockwise direction W1. The push rod assembly 40 can be reset and moved proximally to the end a along the axial direction Y during rotation, so as to retract into the housing assembly 10. During this process, since the clutch 32 is not limited along the circumferential W direction with the rotating part 31, the rotating part 31 rotates clockwise W1 with the push rod assembly 40. Since the clutch 32 does not rotate clockwise W1 with the push rod assembly 40, the adjusting assembly 51 will not rotate clockwise W1 with the push rod assembly 40. Thus, under the circumferential W-direction limiting action of the adjusting assembly 51, the memory element 90 will not rotate clockwise W1. This causes the push rod assembly 40 to rotate relative to the memory element 90 along the axial Y direction toward the proximal end a, so that the memory element 90 can also be reset relative to the push rod assembly 40 after the push rod assembly 40 is reset.

[0148] It should be noted that when the memory element 90 is limited to the fourth limiting part in the clockwise direction W1, and the numerical rotating cylinder 52 is limited to the third limiting structure 13 in the counterclockwise direction W2, the cumulative stroke of the memory element 90 relative to the push rod assembly 40 in the axial direction Y is at its maximum, and the cumulative injection stroke of the push rod assembly 40 relative to the housing assembly 10 in the axial direction Y towards the distal end b is also at its maximum. Furthermore, the scale displayed on the numerical rotating cylinder 52 returns to 0, indicating that the medicine in the vial assembly 200 has been completely injected. Therefore, the maximum cumulative stroke of the memory element 90 relative to the push rod assembly 40 in the axial direction Y is correspondingly set to the maximum cumulative injection stroke of the push rod assembly 40 relative to the housing assembly 10 in the axial direction Y towards the distal end b. In the initial state of the injection device, the distance between the memory element 90 and the fourth limiting part in the axial direction Y can be used to represent the maximum cumulative stroke of the memory element 90 relative to the push rod assembly 40 in the axial direction Y, thus corresponding to the axial Y height of the medicine in the vial assembly 200.

[0149] Therefore, after the scale adjustment is completed, when the memory element 90 is limited to the fourth limiting part of the push rod assembly 40 in the clockwise direction W1, the adjusting component 51 can no longer rotate relative to the clutch assembly 30 in the clockwise direction W1, thus preventing further scale adjustment. After completing the injection, the numerical cylinder 52 rotates counterclockwise to the third limiting structure 13, preventing the adjusting component 51 from rotating counterclockwise W2. Therefore, the push rod assembly 40 cannot move further to the distal end b to perform the injection. The stroke of the push rod assembly 40 towards the distal end b has been used up, and it can be considered that the medicine in the vial assembly 200 has been injected. Therefore, after the medicine in the vial assembly 200 is used up, the adjusting component 51 self-locks, preventing further scale adjustment and injection, thus reducing the risk of accidental injection after the medicine in the vial assembly 200 is used up.

[0150] Please see Figure 1 The injection device provided in this application embodiment includes a syringe assembly 100, a vial assembly 200, and an injection needle 300, as shown in the accompanying drawings. The vial assembly 200 includes a mounting bracket 210 and a vial 220. The mounting bracket 210 is detachably mounted on the housing assembly 10, and the vial 220 is detachably disposed on the mounting bracket 210. The injection needle 300 is detachably mounted on the mounting bracket 210 and communicates with the vial 220. The syringe assembly 100 in this embodiment is the same as the syringe assembly 100 in the above embodiments; please refer to the relevant descriptions of the syringe assembly 100 in the above embodiments for details, which will not be repeated here.

[0151] Specifically, when the push rod assembly 40 moves along the axial direction Y toward the distal end b relative to the housing assembly 10, the push rod assembly 40 pushes the piston 230 inside the medicine bottle 220, so that the piston 230 squeezes the medicine inside the medicine bottle 220 through the injection needle 300 to achieve the injection operation.

[0152] The injection device provided in this application embodiment, by employing the syringe assembly 100 involved in the above embodiments, can improve the waterproof effect of the syringe assembly 100, thereby improving the waterproof effect of the injection device.

[0153] Furthermore, on the one hand, it facilitates the replacement of the injection needle 300, allowing the user to change the injection needle 300 each time the syringe assembly 100 is used. On the other hand, it facilitates the replacement of the vial assembly 200 or the vial 220, allowing the vial assembly 200 to be detached from the housing assembly 10 after the medication in the vial 220 has been injected, and then either the entire vial assembly 200 or the vial 220 can be replaced. This makes the syringe assembly 100 reusable, helping to save resources.

[0154] In some embodiments, please refer to the following: Figure 1 and Figure 3 And in conjunction with other accompanying drawings. The injection device may also include a pen cap 400, which is used to mount on the housing assembly 10 to cover the injection needle 300.

[0155] Based on the above structure, the working principle of the injection device is as follows: In its initial state, the injection device has the vial assembly 200 mounted on the fixing member 12. The vial 220 of the vial assembly 200 abuts against the limiting member 20 along the axial direction Y towards its proximal end a, so that the clutch member 32 and the rotating member 31 are limited and engaged along the circumferential direction W. The main body 22 of the limiting member 20 is spaced apart from the first limiting structure 122 of the fixing member 12. The clutch member 32 is circumferentially limited on the first limiting part 111, and the elastic tooth 512 extends out of the slot 501 along the axial direction Y towards its distal end b, so as to be limited on the clutch assembly 30 in the counterclockwise direction W2. The numerical rotating cylinder 52 is limited in the counterclockwise direction W2 on the third limiting structure 13, so that the scale displayed by the numerical rotating cylinder 52 is 0. The memory member 90 and the fourth limiting part are spaced apart along the axial direction Y, and the distance between the memory member 90 and the fourth limiting part in the axial direction Y is set by the axial Y height of the liquid in the vial assembly 200.

[0156] When using the injection device, the knob 60 can be rotated clockwise W1 (by a second external force) to make the elastic tooth 512 move elastically relative to the ratchet tooth 321 in the clockwise direction W1. In this way, the first adjusting member 5111, the second adjusting member 5112, the numerical rotating cylinder 52, and the memory unit 90 all rotate clockwise W1 relative to the housing assembly 10, the clutch assembly 30, and the push rod assembly 40. This causes the numerical rotating cylinder 52 to move along the axial direction Y toward the distal end b relative to the housing assembly 10 and the adjusting assembly 51, and the memory unit 90 to move along the axial direction Y toward the proximal end a relative to the housing assembly 10 and the adjusting assembly 51. Alternatively, the knob 60 can be rotated counterclockwise W2 (under the action of a second external force). This causes the first adjusting member 5111 to rotate counterclockwise W2 relative to the housing assembly 10. Simultaneously, the first adjusting member 5111 rotates counterclockwise W2 relative to the second adjusting member 5112 by a certain angle, allowing the elastic tooth 512 to retract into the slot 501, reducing the engagement depth between the elastic tooth 512 and the ratchet tooth 321. The rotation of the first adjusting member 5111 counterclockwise W2 drives the second adjusting member 5112 to rotate as well, allowing the adjusting assembly 51 to rotate counterclockwise W2 relative to the housing assembly 10, the clutch assembly 30, and the push rod assembly 40. This enables scale adjustment of the injection device.

[0157] Then, pressing button 70 (with the first external force applied) causes the adjusting assembly 51 to move axially Y towards the distal end b and press against the clutch 32, thereby disengaging the clutch 32 from the first limiting part 111. Under the elastic action of the second elastic member 53, the adjusting assembly 51, the numerical rotating cylinder 52, the memory member 90, the push rod assembly 40, the clutch 32, the first elastic member 33, and the rotating member 31 rotate together counterclockwise W2 relative to the housing assembly 10. The push rod assembly 40 moves axially Y towards the distal end b relative to the housing assembly 10, the clutch assembly 30, and the adjusting assembly 51 to achieve the injection of the medicine. At this time, the memory member 90 moves axially Y towards the distal end b along with the push rod assembly 40.

[0158] If the medicine in vial 220 is not completely injected and another injection is needed, the injection needle 300 can be replaced, and the knob 60 can be rotated again to adjust the scale. Then, the button 70 is pressed to move the push rod assembly 40 along the axial direction Y towards the distal end b relative to the housing assembly 10 to perform another injection.

[0159] When knob 60 cannot be rotated, it indicates that memory element 90 is limited to the fourth limiting part of push rod assembly 40 in the clockwise direction W1, and the medicine in bottle 220 has been injected. At this time, bottle assembly 200 can be disassembled, and rotating element 31 and limiting element 20 disengage from clutch element 32 under the action of first elastic element 33, and the circumferential W engagement between rotating element 31 and clutch element 32 is removed. Furthermore, under the elastic action of first elastic element 33, limiting element 20 and rotating element 31 move relative to housing assembly 10 in the axial direction Y towards the distal end b, so that the main body 22 of limiting element 20 elastically abuts against the first limiting structure 122 of fixing element 12 in the axial direction Y towards the distal end b.

[0160] Then, the push rod assembly 40 can be rotated clockwise in the direction W1 to reset it along the axial direction Y towards the proximal end a into the housing assembly 10. At this time, the memory element 90 will not rotate with the push rod assembly 40 under the limiting action of the adjusting component 51, so that the push rod assembly 40 can still move along the axial direction Y towards the proximal end a relative to the memory element 90, so that the memory element 90 can return to its initial position. At this time, the distance between the memory element 90 and the fourth limiting part can still indicate the liquid level in the medicine bottle 220. Based on this, the medicine bottle assembly 200 or the medicine bottle 220 can be replaced. After replacement, the medicine bottle assembly 200 is installed on the housing assembly 10, so that the above-mentioned scale adjustment and liquid injection work can be repeated.

[0161] It should be further explained that when the medicine bottle 220 breaks and causes the medicine to leak, the limiting member 20 is not blocked by the medicine bottle 220. The limiting member 20 and the rotating member 31 will still move relative to the housing assembly 10 along the axial direction Y towards the far end b under the elastic action of the first elastic member 33, so that the main body 22 of the limiting member 20 elastically abuts against the first limiting structure 122 of the fixing member 12 along the axial direction Y towards the far end b.

[0162] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A syringe assembly for use in an injection device, wherein the injection device has a proximal end and a distal end along its axial direction, characterized in that, The syringe assembly includes: A housing assembly includes a housing and a fixing member. The housing has a first limiting portion. The fixing member includes a fixing sleeve and a first limiting structure disposed on the inner peripheral wall of the fixing sleeve. The fixing sleeve is fixed to one end of the housing along the axial direction near the distal end and is used to install a medicine bottle assembly. The limiting component includes a main body and a second limiting structure. The fixing sleeve is sleeved outside the main body and the second limiting structure. The main body abuts against the first limiting structure along the axial direction toward the distal end. The second limiting structure is disposed at one end of the main body along the axial direction near the distal end and cooperates with the first limiting structure in a circumferential limiting manner. A clutch assembly is rotatably disposed on the main body and is axially positioned and engaged with the main body; the clutch assembly is circumferentially positioned on the first limiting portion and configured to disengage from the first limiting portion under the action of a first external force; A push rod assembly is threadedly connected to the second limiting structure and circumferentially limited on the clutch assembly, and the clutch assembly, the main body and the second limiting structure are all sleeved outside the push rod assembly; the push rod assembly is configured to move axially toward the distal end relative to the clutch assembly and the limiting member when rotating counterclockwise relative to the limiting member, so as to drive the medicine in the medicine bottle assembly; A drive mechanism, disposed on the housing, is used to provide a driving force for the clutch assembly to rotate in the counterclockwise direction.

2. The syringe assembly according to claim 1, characterized in that, The first limiting structure includes: A limiting ring is provided on the inner peripheral wall of the fixed sleeve; The second limiting part is provided on the inner peripheral wall of the limiting ring, and the main body abuts against the limiting ring and the second limiting part along the axial direction toward the distal end; The second limiting structure includes: The main body is located at one end of the main body near the distal end along the axial direction, and is sleeved on the outside of the push rod assembly and threadedly connected to the push rod assembly; The third limiting part is provided on the outer peripheral wall of the main body and cooperates with the second limiting part in a circumferential limiting manner. On the projection plane perpendicular to the axial direction, the orthographic projection outline of the main body is surrounded outside the orthographic projection of the third limiting part.

3. The syringe assembly according to claim 2, characterized in that, The inner peripheral wall of the limiting ring is provided with a plurality of second limiting portions arranged circumferentially, and the outer peripheral wall of the main body is provided with a plurality of third limiting portions arranged circumferentially. The second limiting portions are circumferentially limited between two adjacent third limiting portions, and the third limiting portions are circumferentially limited between two adjacent second limiting portions.

4. The syringe assembly according to any one of claims 1-3, characterized in that, The main body elastically abuts against the first limiting structure along the axial direction toward the distal end; the second limiting structure is used to abut against the medicine bottle of the medicine bottle assembly along the axial direction toward the distal end, and the main body is configured to move relative to the fixing member along the axial direction toward the proximal end as the second limiting structure abuts against the medicine bottle along the axial direction toward the distal end.

5. The syringe assembly according to claim 4, characterized in that, The clutch assembly includes: A rotating component is rotatably disposed on the main body and is axially positioned with the main body; the rotating component is sleeved on the outside of the push rod assembly and is circumferentially positioned with the push rod assembly, and the push rod assembly is configured to move axially relative to the rotating component; A clutch element is spaced apart from the rotating element; the clutch element is circumferentially limited on the first limiting portion and configured to disengage from the first limiting portion under the action of a first external force; the driving mechanism is used to provide the clutch element with a driving force for rotation in the counterclockwise direction; A first elastic element is disposed between the rotating element and the clutch element, and is used to apply an elastic force to the rotating element to move axially toward the distal end relative to the housing assembly, so that the main body can abut against the first limiting structure axially toward the distal end. The limiting member is configured to move axially toward the proximal end under the pressure of the medicine bottle assembly, so that the rotating member and the clutch member are circumferentially limited and engaged.

6. The syringe assembly according to any one of claims 1-3, characterized in that, The main body is sleeved outside the clutch assembly. The inner peripheral wall of the main body is provided with a limiting groove, and the outer peripheral wall of the clutch assembly is provided with a first protrusion. The first protrusion is axially limited within the limiting groove.

7. The syringe assembly according to any one of claims 1-3, characterized in that, The outer peripheral wall of the push rod assembly is provided with a first sliding groove, which extends axially. The inner peripheral wall of the clutch assembly is provided with a second protrusion, which is circumferentially confined within the first sliding groove and can slide axially along the first sliding groove.

8. The syringe assembly according to any one of claims 1-3, characterized in that, The housing is provided with a third limiting structure; the driving mechanism includes: An adjustment component is rotatably disposed within the housing and sleeved on the outside of the push rod assembly; the adjustment component is limited to the clutch assembly in the counterclockwise direction and is further configured to rotate relative to the clutch assembly under the action of a second external force; A numerical rotary cylinder is threadedly connected inside the housing; the numerical rotary cylinder is sleeved outside the adjustment assembly and circumferentially limited on the adjustment assembly, and is configured to move axially relative to the housing assembly and the adjustment assembly when rotating with the adjustment assembly to adjust the scale; The second elastic element is connected between the housing assembly and the adjustment assembly and is configured to provide the adjustment assembly with an elastic force that rotates in the counterclockwise direction, so that the numerical rotating cylinder is limited to the third limiting structure in the counterclockwise direction.

9. The syringe assembly according to claim 8, characterized in that, The clutch assembly has a plurality of ratchet teeth arranged circumferentially at one end of the axial direction toward the proximal end, and the ratchet teeth are inclined in a clockwise direction; The adjustment component includes: An adjusting body is rotatably disposed within the housing and sleeved outside the push rod assembly, and is located at the proximal end of the clutch assembly; the numerical rotating cylinder is sleeved outside the adjusting body, and the adjusting body is connected to the second elastic element and is circumferentially limited in fit with the numerical rotating cylinder; An elastic tooth is disposed on the adjusting body and extends out of the adjusting body toward the distal end; the elastic tooth elastically engages between two adjacent ratchet teeth, is limited to the ratchet teeth in the counterclockwise direction, and is used to elastically move relative to the ratchet teeth in the clockwise direction under the action of the second external force, and is also used to elastically move relative to the ratchet teeth in the counterclockwise direction under the action of the second external force.

10. An injection device, characterized in that, include: The syringe assembly according to any one of claims 1-9; A medicine bottle assembly includes a mounting bracket detachably mounted on the housing assembly and a medicine bottle detachably disposed on the mounting bracket; The injection needle is detachably mounted on the mounting bracket and communicates with the vial.

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