Transmission assembly and drug delivery device

Abstract

The application relates to a transmission assembly and a drug delivery device. The transmission assembly comprises: an adjustment member for rotation about an axis to set a dose; a transmission member driven to rotate when a force is released by an energy storage member which is accumulated when the adjustment member is rotated about the axis to set the dose; a drive member for transmitting the force to a drug delivery assembly; a clutch at least partially rotating synchronously with the transmission member and transmitting the force, the clutch being movable from a first axial position to a second axial position and starting an injection, the clutch being at least partially rotationally coupled to the adjustment member at the first axial position, such that the force is transmitted between the adjustment member and the transmission member via the clutch; the clutch being disengaged from the adjustment member and at least partially rotationally coupled to the drive member at the second axial position, the force of the transmission member being transmitted to the drive member via the clutch. The drug delivery device comprises the transmission assembly and an energy storage member for providing the force. The application can improve the stability of the force transmission and the accuracy of the bolus dose.

Description

Technical Field

[0001] This application relates to the technical field of medical injection devices, and in particular to a transmission component and a drug delivery device. Background Technology

[0002] Subcutaneous drug injection typically utilizes a specific drug delivery device, often referred to as an auto-injection pen or pen syringe. Depending on the user's needs, the device usually allows for dosage adjustment and injection by the user, delivering the intended dose of medication into the body. The drug delivery device mainly comprises a housing, a power storage unit, a transmission assembly, and a drug delivery assembly. The power storage unit provides the driving force for injection, the transmission assembly transmits this force during dosage setting and injection, and the drug delivery assembly primarily includes a screw that transmits the driving force from the transmission assembly to the vial and dispenses the medication.

[0003] In related technologies, due to the complex structure of the transmission components in actual applications and the instability of the driving force during the transmission process, the dose set during injection adjustment is not accurate enough, or the preset dose cannot be accurately injected during the injection process, thus failing to achieve accurate drug delivery. Utility Model Content

[0004] In order to overcome the technical problems of unstable force transmission and inaccurate injection dosage in existing drug delivery devices, one of the objectives of this utility model is to provide a transmission component with stable force transmission, so as to ensure that the driving force can be stably transmitted during the use of the drug delivery device, and that the injection force required for the preset dose is consistent with the actual injection force.

[0005] The transmission component provided in this application adopts the following technical solution:

[0006] A transmission assembly includes: an adjusting member for rotating about an axis to set a dose; a transmission member that rotates about an axis at the set dose to store power in an energy storage member and is driven to rotate when the energy storage member releases injection power; a driving member for transmitting injection power to a drug delivery assembly; and a clutch that rotates at least partially synchronously with the transmission member and transmits power, the clutch being movable from a first axial position to a second axial position under external force to initiate injection, the clutch being at least partially anti-rotationally connected to the adjusting member in the first axial position such that a driving force corresponding to the set dose is transmitted between the adjusting member and the transmission member via the clutch; and the clutch disengaging from the adjusting member and at least partially anti-rotationally connected to the driving member in the second axial position such that power from the transmission member is transmitted to the driving member via the clutch.

[0007] By adopting the above technical solution, the driving force provided by the adjustment component during dosage setting is transmitted to the transmission component via the clutch, thereby enabling the energy storage component to accumulate power. During injection, the energy storage component releases the power to drive the transmission component to rotate. The transmission component then transmits the driving force to the drive component via the clutch, ensuring that the driving force can be stably transmitted during both dosage setting and injection, and that the two power transmission routes are relatively independent and do not interfere with each other.

[0008] Furthermore, it also includes a power locking structure, which is used to lock the rotation of the transmission and / or clutch relative to the housing when the adjustment member is not rotated during dosage setting.

[0009] By adopting the above technical solution, the torque transmitted to the energy storage device can be locked after the adjustment component, clutch, and transmission component rotate to drive the energy storage device to twist and store energy.

[0010] Furthermore, the power locking structure includes a locking member, the clutch has a locking engagement portion, the locking member is fixed relative to the housing during a set dosage period, and the locking member is used to stop the locking engagement portion when the adjustment member is stopped from rotating.

[0011] Furthermore, the locking element includes a ratchet, and the clutch is provided with one-way teeth that engage with the ratchet.

[0012] Furthermore, the adjusting member rotates in a first direction around the axis for forward dose adjustment, and rotates in a second direction around the axis for reverse dose reversal; there is an elastic element between the clutch and the transmission member, and when the dose is reversed, at least part of the clutch moves axially to the distal end and compresses the elastic element, and the locking engagement separates axially from the locking member and rotates in a second direction around the axis.

[0013] Furthermore, the clutch includes a biasing device, which has a first connecting portion and a second connecting portion. The adjusting member has a third connecting portion, and the driving member has a fourth connecting portion. When the biasing device is in a first axial position, the first connecting portion engages with the third connecting portion, allowing the biasing device and the adjusting member to rotate synchronously. When the biasing device is in a second axial position, the first connecting portion disengages from the third connecting portion, and the second connecting portion engages with the fourth connecting portion, allowing the biasing device and the driving member to rotate synchronously.

[0014] By adopting the above technical solution, the power transmission route can be switched simply by changing the axial position of the bias device and its mating relationship.

[0015] Furthermore, the first connecting portion and the third connecting portion are toothed connections, and / or the second connecting portion and the fourth connecting portion are toothed connections.

[0016] By adopting the above technical solution, the biasing device and the adjusting component, as well as the biasing device and the driving component, are more stable during synchronous rotation, ensuring the normal transmission of driving force, and making the disengagement of the biasing device and the adjusting component and the engagement of the biasing device and the driving component more efficient.

[0017] Furthermore, the clutch also includes a sound-generating plate, which is anti-rotationally connected to the transmission member, and the locking engagement is disposed on the sound-generating plate; when adjusting the dosage in the forward direction, the sound-generating plate rotates synchronously with the bias device; when adjusting the dosage in the reverse direction, the bias device rotates synchronously with the adjustment member and drives the sound-generating plate to move axially to the distal end until the locking engagement is axially separated from the locking member, and the energy storage member releases the driving force to make the transmission member and the sound-generating plate rotate about the axis in a second direction.

[0018] Furthermore, the biasing device is provided with a one-way clutch boss, and the sound-emitting plate is provided with a one-way clutch groove that cooperates with the one-way clutch boss. When the biasing device rotates around the axis in a first direction at the first axial position, the one-way clutch boss and the one-way clutch groove are in direct contact. When the biasing device rotates around the axis in a second direction at the first axial position, the one-way clutch boss and the one-way clutch groove are in inclined contact, causing the sound-emitting plate to move axially relative to the biasing device.

[0019] By adopting the above technical solution, both the positive adjustment dose and the negative adjustment dose can be locked by the torque through the locking component.

[0020] Furthermore, the sound-generating plate is provided with a guide portion, and the transmission member is provided with a guide groove that cooperates with the guide portion. The guide portion can move along the guide groove from a first axial position to a second axial position.

[0021] By adopting the above technical solution, the change in the axial position of the clutch does not affect the power transmission of the transmission components during the dosage setting and injection processes.

[0022] Furthermore, it includes a button for driving the clutch to move from a first axial position to a second axial position to switch the transmission assembly from a dosage setting state to an injection state.

[0023] By adopting the above technical solution, the switching steps between the dosage setting state and the injection state are simplified.

[0024] The second objective of this utility model is to provide a drug delivery device with a stable force transmission component, which adopts the following technical solution:

[0025] The transmission assembly includes the above-mentioned transmission component, and an energy storage component for providing thrust driving force is provided between the transmission component and the driving component. One end of the energy storage component is connected to the transmission component, and the other end is fixed to the housing.

[0026] By adopting the above technical solution, during the dosage setting period, the adjusting component, clutch, and transmission component rotate, causing the energy storage component to generate the driving force required to inject the predetermined drug. During injection, the driving force is transmitted to the drug injection assembly via the transmission component, clutch, and driving component, and is used to inject the drug.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Simplify the transmission components and improve the stability of drive force transmission;

[0029] 2. The torque generated by the set dosage can be precisely locked, thus allowing for accurate drug delivery.

[0030] 3. The power transmission routes for dose setting and injection do not interfere with each other, and the switching steps between dose setting state and injection state are simple. Attached Figure Description

[0031] Figure 1 This is an exploded view of the transmission assembly and drug delivery device in an embodiment of this application;

[0032] Figure 2 This is a cross-sectional schematic diagram of the drug delivery device under the dosage setting state in the embodiments of this application;

[0033] Figure 3 This is a cross-sectional schematic diagram of the drug delivery device in the injection state in the embodiments of this application;

[0034] Figure 4A This is a perspective view of the locking element in the embodiments of this application;

[0035] Figure 4B This is a three-dimensional schematic diagram of the locking element being inverted in an embodiment of this application;

[0036] Figure 5A This is a three-dimensional schematic diagram of the sound-emitting sheet in the embodiments of this application;

[0037] Figure 5B This is a three-dimensional schematic diagram of the inverted sound-emitting plate in an embodiment of this application;

[0038] Figure 6 This is a schematic diagram showing the connection of some transmission components and drug delivery devices in the embodiments of this application;

[0039] Figure 7 This is a cross-sectional view of the biaser inverted in an embodiment of this application;

[0040] Figure 8 This is a three-dimensional schematic diagram of the inverted adjusting component in an embodiment of this application;

[0041] Figure 9 This is a three-dimensional schematic diagram of the driving component in the embodiments of this application;

[0042] Figure 10 This is a three-dimensional schematic diagram of the biaser being inverted in an embodiment of this application;

[0043] Figure 11 This is a cross-sectional schematic diagram of the transmission component in an embodiment of this application;

[0044] Figure 12 This is a cross-sectional schematic diagram of the energy storage device connection structure in the embodiments of this application.

[0045] Explanation of reference numerals in the attached drawings: 1. Adjusting component; 11. Third connecting part; 2. Transmission component; 21. Slide groove; 22. Guide groove; 221. First end face; 222. Second end face; 23. Fixing buckle; 3. Driving component; 31. Fourth connecting part; 4. Clutch; 41. Offset device; 411. First connecting part; 412. Second connecting part; 413. One-way clutch boss; 4131. First straight surface; 4132. First inclined surface; 42. Sound-emitting plate; 421. Locking engagement part; 422. Protruding rib; 423. Guide part; 424. One-way clutch groove; 4241. Second straight surface; 4242. Second inclined surface; 5. Energy storage component; 51. First fixing part; 52. Second fixing part; 6. Locking component; 61. Gear ring; 7. Elastic component; 8. Button; 9. Housing; 10. Housing connecting part. Detailed Implementation

[0046] The embodiments of this utility model are described in detail below. Examples of the 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0047] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] It should be noted that the transmission component involved in this application is applied to a drug delivery device, which includes a housing and a dose setting component, a transmission component, and a drug delivery component, which are at least partially disposed within the housing. The dose setting component can extend spirally relative to the housing for dose adjustment and retract spirally for dose reversal. The transmission component is used to lock the driving force required to inject the intended drug after the dose is set. When the user applies axial force and starts the injection, the transmission component transmits the driving force to the drug delivery component so that the drug delivery component can push the drug out.

[0050] This application discloses a transmission component.

[0051] Reference Figures 1 to 3 The transmission assembly includes an adjusting member 1, a transmission member 2, a driving member 3, and a clutch 4. The adjusting member 1 is located near the end of the housing 9 and can rotate relative to the housing 9. The user can preset the injection dose by rotating the adjusting member 1. In this embodiment, the adjusting member 1 rotates about the axis in a first direction for forward dose adjustment, and rotates about the axis in a second direction for reverse dose adjustment. The user can select the rotation direction of the adjusting member 1 and rotate the adjusting member 1 until the desired dose is achieved.

[0052] The transmission component 2 is located inside the housing 9 and can rotate relative to the housing 9. When setting the dosage, the transmission component 2 rotates around its axis, causing the energy storage component 5 to accumulate power. Specifically, when adjusting the dosage in the forward direction, the transmission component 2 rotates synchronously with the adjusting component 1, and the energy storage component 5 accumulates power. When adjusting the dosage in the reverse direction, the transmission component 2 rotates around its axis in a second direction, causing the energy storage component 5 to release the power corresponding to the adjusted dosage. The transmission component 2 serves as the end point of the power input path, and the injection power accumulated in the energy storage component 5 is the power accumulated during forward adjustment minus the power released during reverse adjustment. When performing injection, the injection power accumulated during dosage setting is released by the energy storage component 5. This injection power causes the transmission component 2 to rotate relative to the housing 9 in a second direction around its axis. At this time, the transmission component 2 serves as the starting point of the power output path, and all the power that can be released during injection is the final power accumulated during dosage setting.

[0053] The drive unit 3 is located inside the transmission unit 2 and is operably connected to the drug delivery assembly for transmitting injection power to the drug delivery assembly to inject the drug into the human body.

[0054] A clutch 4, which rotates at least partially synchronously with the transmission component 2 and transmits power, can move from a first axial position to a second axial position and begin injection under the action of an external force. (Refer to...) Figure 2 The clutch 4 is at least partially connected to the adjusting member 1 in a first axial position in an anti-rotational manner, so that at least part of the clutch 4 can rotate synchronously with the adjusting member 1, thereby realizing the transmission of driving force corresponding to the set dosage between the adjusting member 1 and the transmission member 2 via the clutch 4; the power of the adjusting member 1 is transmitted to the transmission member 2 via the clutch 4, and the transmission member 3 causes the energy storage member 5 to store energy, thereby forming the power transmission route for the dosage setting, i.e., the power input route; refer to Figure 3 After the user sets the dosage, the clutch 4 moves to the second axial position under the action of external force. At this time, the clutch 4 and the adjusting member 1 are disengaged, that is, they can rotate relative to each other. The power transmission route for dosage setting is disconnected, and the clutch 4 is at least partially connected to the driving member 3 in the second axial position in a non-rotational manner. At this time, the power released by the energy storage member 5 drives the transmission member 2 to rotate. The clutch 4 and the driving member 3 rotate in conjunction. Therefore, the driving force can be transmitted to the driving member 3 through the transmission member 2 and the clutch 4, thereby forming the power transmission route for injection, that is, the power output route.

[0055] It should be noted that the first direction around the axis mentioned above is clockwise, and the second direction around the axis is counterclockwise. The proximal end is defined with the user as the reference, and the end closer to the user is defined as the proximal end, while the drug injection end is defined as the distal end. Both the first axial position and the second axial position are referenced to the housing 9. Specifically, in this embodiment, the first axial position is closer to the proximal end than the second axial position. Furthermore, the external force driving the clutch 4 from the first axial position to the second axial position can be provided by the user.

[0056] With the above configuration, the driving force provided by the adjusting component 1 is transmitted to the transmission component 2 via the clutch 4 during dosage setting, thereby accumulating power. During injection, the power is released via the transmission component 2 and transmitted to the driving component 3 via the clutch 4, ensuring that the driving force can be stably transmitted during both dosage setting and injection, and that the two power transmission routes are relatively independent and do not interfere with each other.

[0057] In this embodiment, during dosage setting, the clutch 4 and transmission component 2 rotate in conjunction with the adjusting component 1, causing the energy storage component 5 connected to the transmission component 2 to generate torque. This torque causes the transmission component 2 and clutch 4 to tend to rotate in opposite directions driven by the energy storage component 5. To prevent the energy storage component 5 from driving the transmission component 2 and clutch 4 to rotate and reset around the second axis when the user sets the predetermined dosage and stops rotating the adjusting component 1, thus releasing the injection force before injection is performed, this embodiment also provides a power locking structure. The power locking structure is used to lock the rotation of the transmission component 2 and / or clutch 4 relative to the housing 9 after dosage setting. That is, during dosage setting, each time the user stops rotating the adjusting component 1, the reset rotation tendency of the transmission component 2 and / or clutch 4 is restricted by the power locking structure to prevent them from rotating relative to the housing 9. Specifically, it prevents the transmission component 2 and / or clutch 4 from rotating around the second axis, thereby locking the torque generated corresponding to the preset dosage and avoiding inconsistency between the injected dosage and the preset dosage.

[0058] Reference Figure 4A , Figure 4B Furthermore, the power locking structure includes a locking element 6, which is fixed relative to the housing 9 during dose setting; see reference. Figure 5A , Figure 5B The clutch 4 is provided with a locking engagement part 421, which engages... Figure 6 During the rotation of the clutch 4 with the adjusting member 1, the locking engagement portion 421 slides relative to the locking member 6, and the locking member 6 does not perform a stopping function. When the adjusting member 1 stops rotating, the locking member 6 performs a stopping function and engages with the locking engagement portion 421 in an anti-rotational manner to prevent the clutch 4 from rotating relative to the housing 9, specifically preventing the clutch 4 from rotating in a second direction about the axis. In other embodiments, the locking engagement portion 421 is provided on the transmission member 2. During the rotation of the transmission member 2 with the adjusting member 1 and the clutch 4, the locking engagement portion 421 slides relative to the locking member 6, and the locking member 6 does not perform a stopping function. When the adjusting member 1 stops rotating, the locking member 6 performs a stopping function and engages with the locking engagement portion 421 in an anti-rotational manner to prevent the transmission member 2 from rotating relative to the housing 9, specifically preventing the transmission member 2 from rotating in a second direction about the axis.

[0059] Reference Figures 4A to 6 Furthermore, the locking member 6 includes a ratchet, and the locking engagement portion 421 includes one-way teeth that engage with the ratchet. Specifically, the locking member 6 is annular, and the outer wall of the annulus is provided with a toothed ring 61. The one-way teeth engage with the toothed ring 61 and can achieve one-way rotation. Specifically, when the clutch 4 rotates with the adjusting member 1 around the first axis in the first direction, the one-way teeth can slide over the toothed ring 61 and can be inserted into the tooth groove of the toothed ring 61, while the toothed ring 61 prevents the one-way teeth from rotating around the second axis in the second direction. That is, the locking member 6 and the locking engagement portion 421 form a ratchet and pawl meshing relationship. Furthermore, the one-way teeth and the toothed ring 61 are helical teeth, and the inclination direction is consistent with the first rotation direction.

[0060] By adopting the above technical solution, when the adjusting component 1 is rotated, the torque generated by the energy storage component 5 when it is driven to twist can be locked, thereby realizing energy storage and ensuring that the torque of the energy storage component 5 is not accidentally released before injection.

[0061] Furthermore, refer to Figure 6 An elastic element 7 is provided between the clutch 4 and the transmission member 2. This elastic element 7 initially exerts a proximal force on the clutch 4, causing the locking engagement 421 to engage with the locking member 6 when the clutch 4 is in its first axial position and not rotating relative to the housing. During forward dosage adjustment, the clutch 4, under the action of the adjusting member 1 and the elastic element 7, ensures that the locking engagement 421 and the locking member 6 are slidably engaged. Specifically, the clutch 4 rotates under the drive of the adjusting member 1 and engages the locking member 6 under the action of the elastic element 7. Therefore, the driving force for injection and the injectable dosage increase accordingly with the increase of the rotation angle of the adjusting member 1. During reverse dosage adjustment, while the adjusting member 1 rotates in the second direction around the axis, the clutch 4 is subjected to the rotational force of the adjusting member 1. Simultaneously, at least a portion of the clutch 4 generates axial disengagement movement, and the locking engagement 42 exerts an axial force on the elastic element 7 in the distal direction, causing the engagement state of the locking engagement 421 and the locking member 6 to be released. Correspondingly, the rotation of the clutch 4 and the transmission member 2 can release the torque stored in the energy storage member 5. Therefore, the driving force for injection and the injectable dosage decrease accordingly as the rotation angle of the adjusting member 1 increases, until the adjusting member 1 stops rotating. At this point, the elastic member 7 acts on the clutch 4 again, so that the locking engagement 421 remains engaged with the locking member 6. The elastic member 7 can be a compression spring, elastic sheet, etc., as long as it can withstand and transmit vertical loads.

[0062] Reference Figures 7 to 9 Furthermore, the clutch 4 includes a biaser 41, which has a first connecting portion 411 and a second connecting portion 412. The adjusting member 1 has a third connecting portion 11, and the driving member 3 has a fourth connecting portion 31. When the biaser 41 is in the first axial position, the first connecting portion 411 engages with the third connecting portion 11, allowing the biaser 41 and the adjusting member 1 to rotate synchronously. When the biaser 41 is in the second axial position, the first connecting portion 411 disengages from the third connecting portion 11, and the second connecting portion 412 engages with the fourth connecting portion 31, allowing the biaser 41 and the driving member 3 to rotate synchronously. Therefore, when the biaser 41 is subjected to an axial force towards the distal end, the first connecting portion 411 gradually disengages from the third connecting portion 11, and the axial force towards the distal end continues to be applied to the biaser 41, causing the second connecting portion 412 and the fourth connecting portion 31 to fully engage, thereby switching the connection between the biaser 41 and the adjusting member 1 and the driving member 3.

[0063] Specifically, in this embodiment, the first connecting part 411 is located near the biaser 41, and the third connecting part 11 is located at the far end of the bias adjustment member 1. The two are connected by a toothed joint, specifically a mutually engaging toothed structure. This toothed structure ensures that the biaser 41 and the adjustment member 1 can rotate stably and synchronously, facilitating the axial separation of the biaser 41 relative to the adjustment member 1. Similarly, the second connecting part 412 is located at the far end of the biaser 41, and the fourth connecting part 31 is located near the near end of the drive member 3. These can also be mutually engaging toothed structures, facilitating the axial engagement of the biaser 41 and the drive, and ensuring stable synchronous rotation of the biaser 41 and the drive. Furthermore, the aforementioned toothed structure is preferably evenly distributed around the circumference. The teeth can be multiple parallel vertical teeth, with tooth shapes such as triangles, trapezoids, and rectangles, facilitating axial engagement and separation as well as circumferential anti-rotational connection, thereby ensuring uniform transmission of driving force.

[0064] By adopting the above technical solution, applying axial force to the bias device 41 can change its axial position and engagement relationship, thereby realizing the rapid switching of the power transmission route. Furthermore, due to the use of a toothed structure, the meshing between the bias device 41 and the adjusting member 1, and between the bias device 41 and the driving member 3, is more stable during the movement process. Additionally, the disengagement of the bias device 41 from the adjusting member 1 and the meshing of the bias device 41 with the driving member 3 are more efficient.

[0065] Reference Figure 5A , Figure 5B Furthermore, the clutch 4 also includes a sound-generating plate 42, which is connected to the transmission member 2 in an anti-rotational manner, and a locking engagement 421 is provided on the sound-generating plate 42. When adjusting the dosage in the forward direction, the sound-generating plate 42 rotates synchronously with the bias device 41; when adjusting the dosage in the reverse direction, the bias device 41 rotates synchronously with the adjustment member 1 and drives the sound-generating plate 42 to move axially to the distal end until the locking engagement 421 is axially separated from the locking member 6, and the energy storage member 5 releases the driving force, causing the transmission member 2 and the sound-generating plate 42 to rotate about the axis in a second direction.

[0066] Reference Figure 5A , Figure 10 Furthermore, the bias device 41 is provided with a one-way clutch boss 413, and the sound-emitting plate 42 is provided with a one-way clutch groove 424 that cooperates with the one-way clutch boss 413. When adjusting the dose in the forward direction, the sound-emitting plate 42 and the bias device 41 do not engage or disengage, and when adjusting the dose in the reverse direction, the sound-emitting plate 42 and the bias device 41 engage or disengage. Specifically, when the bias device 41 rotates around the axis in the first direction at the first axial position, the one-way clutch boss 413 and the one-way clutch groove 424 are in direct contact, and the sound-emitting plate 42 and the bias device 41 have no relative axial movement; when the bias device 41 rotates around the axis in the second direction at the first axial position, the one-way clutch boss 413 and the one-way clutch groove 424 are in inclined contact, causing the sound-emitting plate 42 to move axially relative to the bias device 41.

[0067] Reference Figure 5A , Figure 10 In this embodiment, the one-way clutch boss 413 has a first straight surface 4131 and a first inclined surface 4132, and the one-way clutch groove 424 has a second straight surface 4241 and a second inclined surface 4242; wherein, the second inclined surface 4242 and the first inclined surface 4132 have the same inclination direction, preferably, the second inclined surface 4242 is parallel to the first inclined surface 4132. When the bias device 41 rotates around the axis in the first direction at the first axial position, the first straight surface 4131 abuts against the second straight surface 4241, thereby causing the bias device 41 to drive the sound-emitting plate 42 to rotate synchronously; when the bias device 41 rotates around the axis in the second direction at the first axial position, the first inclined surface 4132 contacts the second inclined surface 4242, and the contact between the first inclined surface 4132 and the second inclined surface 4242 causes the sound-emitting plate 42 to move axially relative to the bias device 41, specifically, the sound-emitting plate 42 moves distally relative to the bias device 41, combined with Figure 6 At this time, the sound-producing plate 42 compresses the elastic element 7 at the distal end, causing the aforementioned one-way tooth to disengage from the toothed ring 61.

[0068] The above technical solution provides a clutch structure for assisting in locking the torque required to inject the dose after a reverse callback.

[0069] Reference Figure 5A , Figure 5B , Figure 11 In this embodiment, the sound-emitting plate 42 is provided with a protruding rib 422, and the transmission member 2 is provided with a sliding groove 21 that cooperates with the protruding rib 422 to ensure that the two can rotate synchronously. It can be understood that providing a sliding groove 21 on the sound-emitting plate 42 and a protruding rib 422 on the transmission member 2 can also achieve the same cooperation and synchronous rotation. Furthermore, the sound-emitting plate 42 is provided with a guide portion 423, and the transmission member 2 is provided with a guide groove 22 that cooperates with the guide portion 423. The guide portion 423 can move axially within the guide groove 22. Further, the guide groove 22 has a first end face 221 and a second end face 222, which limit the maximum distance the sound-emitting plate 42 can move axially relative to the transmission member 2. That is, when the sound-emitting plate 42 is in the first axial position, the guide portion 423 engages with the first end face 221 of the guide groove 22; when the sound-emitting plate 42 moves to the second axial position, the guide portion 423 engages with the second end face 222 of the guide groove 22. Furthermore, the guide portion 423 is a latch so that when the sound-emitting plate is in the first axial position, the axial movement of the guide portion 423 relative to the transmission member 2 in the proximal direction is prohibited.

[0070] By adopting the above technical solution, the axial position change of the clutch 4 does not affect the power transmission of the transmission component 2 during the dosage setting and injection processes.

[0071] Reference Figure 2 , Figure 3Furthermore, a button 8 is included, which drives the clutch 4 to move from a first axial position to a second axial position to switch the transmission assembly from a dosage setting state to an injection state. In this embodiment, the user applies a distal axial force to the button 8 to move the biaser 41 and the sound-emitting plate 42 from the first axial position to the second axial position, causing the first connecting portion 411 of the biaser 41 to disconnect from the third connecting portion 11 of the adjusting member 1, and the second connecting portion 412 of the biaser 41 to connect with the fourth connecting portion 31 of the driving member 3. The guide portion 42 of the sound-emitting plate 42 changes from a state engaged with the first end face 221 of the guide groove 22 on the transmission member 2 to a state engaged with the second end face 222 of the guide groove 22. The driving force for injection is transmitted to the driving member 3 via the transmission member 3, the sound-emitting plate 42, and the biaser 41, and then transmitted to the drug delivery assembly by the driving member 3, thereby injecting the drug.

[0072] By adopting the above technical solution, the switching steps between the dosage setting state and the injection state are simplified.

[0073] This application also discloses a drug delivery device.

[0074] Reference Figure 1 , Figure 12 The drug delivery device includes the aforementioned transmission assembly. An energy storage element 5 is provided between the transmission element 2 and the drive element 3 to provide the driving force for injection. One end of the energy storage element 5 is connected to the transmission element 2, and the other end is fixed to the housing. During dose setting, the energy storage element can store or release power; specifically, the energy storage element 5 stores energy when adjusting the dose in the forward direction, and releases power when adjusting the dose in the reverse direction. During injection, the energy storage element releases power.

[0075] In this embodiment, the energy storage component 5 is a torsion spring. It should be noted that one end of the torsion spring can be directly fixed to the housing 9, or it can be fixedly connected to the housing connecting part 10, as long as the connection structure cannot rotate or rotate relative to the housing 9. Furthermore, in this embodiment, the torsion spring can be fixed using a hook. The two ends of the torsion spring are respectively a hook-shaped first fixing part 51 and a second fixing part 52. Both the transmission component 2 and the housing 9 / housing connecting part 10 are provided with fixing buckles for engaging the torsion spring hooks. Specifically, the transmission component 2 is provided with a fixing buckle 23 for engaging with the first fixing part 51, and the housing 9 or housing connecting part 10 engages with the second fixing part 52, thereby ensuring reliable connection of the torsion spring and allowing for convenient disassembly and replacement.

[0076] By adopting the above technical solution, during the dosage setting period, the adjustment component 1, clutch 4, and transmission component 2 rotate, causing the torsion spring to generate the driving force required to push the predetermined drug. During the injection, the driving force is transmitted to the drug injection assembly via the transmission component 2, clutch 4, and drive component 3, and is used to push the drug.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A transmission assembly, characterized in that, include: An adjusting element, the adjusting element being used to rotate about an axis to set a dosage; The transmission component rotates about its axis when a set dose is taken, causing the energy storage component to accumulate power, and is driven to rotate when the energy storage component releases the injection power. A drive unit for transmitting injection power to the drug delivery assembly; A clutch that rotates at least partially synchronously with the transmission member and transmits power, the clutch being movable from a first axial position to a second axial position under the action of an external force and initiating injection, the clutch being at least partially anti-rotationally connected to the adjustment member in the first axial position, such that a driving force corresponding to a set dosage is transmitted between the adjustment member and the transmission member via the clutch; The clutch is disengaged from the adjusting member in a second axial position and is at least partially connected to the drive member in an anti-rotational manner, such that the power of the transmission member is transmitted to the drive member via the clutch.

2. The transmission assembly according to claim 1, characterized in that, It also includes a power locking structure, which locks the rotation of the transmission and / or the clutch relative to the housing when the adjusting member is not rotated during dosage setting.

3. The transmission assembly according to claim 2, characterized in that, The power locking structure includes a locking member, the clutch has a locking engagement portion, the locking member is fixed relative to the housing during a set dosage period, and the locking member is used to stop the locking engagement portion when the adjustment member is stopped from rotating.

4. The transmission assembly according to claim 3, characterized in that, The adjusting member rotates about the axis in a first direction for forward dose adjustment, and rotates about the axis in a second direction for reverse dose adjustment; there is an elastic element between the clutch and the transmission member, and when the dose is reversed, at least part of the clutch moves axially to the distal end and compresses the elastic element, and the locking engagement separates axially from the locking member and rotates about the axis in a second direction.

5. The transmission assembly according to claim 4, characterized in that, The clutch includes a biasing device, which has a first connecting portion and a second connecting portion. The adjusting member has a third connecting portion, and the driving member has a fourth connecting portion. When the biasing device is in a first axial position, the first connecting portion engages with the third connecting portion, allowing the biasing device and the adjusting member to rotate synchronously. When the biasing device is in a second axial position, the first connecting portion disengages from the third connecting portion, and the second connecting portion engages with the fourth connecting portion, allowing the biasing device and the driving member to rotate synchronously.

6. The transmission assembly according to claim 5, characterized in that, The clutch further includes a sound-generating plate, which is anti-rotationally connected to the transmission member, and the locking engagement is disposed on the sound-generating plate; when adjusting the dosage in the forward direction, the sound-generating plate rotates synchronously with the bias device; when adjusting the dosage in the reverse direction, the bias device rotates synchronously with the adjustment member and drives the sound-generating plate to move axially to the distal end until the locking engagement is axially separated from the locking member, and the energy storage member releases the driving force to make the transmission member and the sound-generating plate rotate about the axis in a second direction.

7. The transmission assembly according to claim 6, characterized in that, The biasing device is provided with a one-way clutch boss, and the sound-emitting plate is provided with a one-way clutch groove that cooperates with the one-way clutch boss. When the biasing device rotates in the first axial position about the axis in the first direction, the one-way clutch boss and the one-way clutch groove are in direct contact. When the biasing device rotates in the first axial position about the axis in the second direction, the one-way clutch boss and the one-way clutch groove are in inclined contact, causing the sound-emitting plate to move axially relative to the biasing device.

8. The transmission assembly according to claim 6, characterized in that, The sound-generating plate is provided with a guide portion, and the transmission component is provided with a guide groove that cooperates with the guide portion. The guide portion can move along the guide groove from a first axial position to a second axial position.

9. The transmission assembly according to claim 1, characterized in that, Includes a button for driving the clutch to move from a first axial position to a second axial position, thereby switching the transmission assembly from a dosage setting state to an injection state.

10. A drug delivery device, characterized in that, The transmission assembly includes any one of claims 1-9, wherein an energy storage element for providing a thrust driving force is provided between the transmission element and the driving element, one end of the energy storage element is connected to the transmission element, and the other end is fixed to the housing.

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