Delay mechanism and injection device

Abstract

The application relates to a delay mechanism and an injection device, wherein the delay mechanism comprises a first component, a second component, a damping liquid and a first sealing member; the first component and the second component are sleeved, and the first component and the second component are matched to form a damping chamber accommodating the damping liquid, and the damping chamber is communicated with an outflow channel for the damping liquid to flow out; the second component can move from a first position to a second position; when the second component is at the first position, the first sealing member seals the outflow channel to prevent the damping liquid from flowing out of the damping chamber through the outflow channel; when the second component moves from the first position to the second position, the first sealing member is separated from the state of sealing the outflow channel under the action force of the damping liquid in the outflow channel to allow the damping liquid to flow out of the damping chamber through the outflow channel. The application can avoid the situation that the damping liquid flows out of the damping chamber to shorten the delay time before the delay mechanism is started, and thus the accuracy of the delay mechanism is ensured.

Description

Technical Field

[0001] This application relates to the technical field of injection devices, and particularly to a delay mechanism and an injection device. Background Technology

[0002] An injection device can inject the medication contained within it into the body of the recipient through a needle at the injection site. During actual injection, the injected medication usually needs a certain amount of time to be completely expelled from the vial, and the medication also needs a certain amount of time to disperse at the injection site. To ensure that the medication can be injected more fully into the recipient's body, the injection device is usually equipped with a delay mechanism to delay the removal of the needle.

[0003] In related technologies, a delay mechanism mainly includes a delaying component capable of relative movement and a damper. The relative movement between the delaying component and the damper is typically powered by a dynamic spring. The damper and the delaying component cooperate to form a damping chamber with a pre-defined channel, containing a highly viscous liquid. During the delay period, the delaying component, moving relative to the damper, gradually compresses the damping chamber and forces the highly viscous liquid out through the channel. The resistance of the highly viscous liquid slows down the movement of the delaying component to achieve the delay function. However, some of the highly viscous liquid may also flow out of the damping chamber through the channel before the delay mechanism is activated, which reduces the total delay time of the mechanism and affects its accuracy. Utility Model Content

[0004] One of the objectives of this application is to provide a delay mechanism that can prevent the damping fluid from flowing out of the damping chamber before the delay mechanism is activated, thereby shortening the delay time and ensuring the accuracy of the delay mechanism.

[0005] The second objective of this application is to provide an injection device that includes the delay mechanism provided in one of the above objectives, which can ensure the accuracy of the delay function of the injection device.

[0006] One of the objectives of this application is to provide a delay mechanism, which adopts the following technical solution:

[0007] A delay mechanism includes a first component, a second component, a damping fluid, and a first seal;

[0008] The first component and the second component are nested together, and the first component and the second component cooperate to form a damping chamber for containing the damping liquid, and the damping chamber is connected to an outflow channel for the damping liquid to flow out.

[0009] The second component is capable of moving from a first position to a second position relative to the first component along a first direction, and is capable of compressing the damping chamber during the movement of the second component from the first position to the second position;

[0010] When the second component is in the first position, the first seal seals the outflow channel to prevent the damping liquid from flowing out of the damping chamber through the outflow channel; when the second component moves from the first position to the second position, the first seal is disengaged from sealing the outflow channel by the force of the damping liquid in the outflow channel, so as to allow the damping liquid to flow out of the damping chamber through the outflow channel.

[0011] By adopting the above technical solution, before the delay mechanism is activated, the outflow channel connected to the damping chamber is sealed by the first seal, effectively preventing the damping liquid from flowing out of the damping chamber before the delay mechanism is activated, thus shortening the delay time and ensuring the accuracy of the delay mechanism. When the delay mechanism is activated, the second component moves relative to the first component from the first position to the second position to compress the damping chamber. The damping liquid in the damping chamber exerts a force on the first seal that seals the outflow channel, causing the first seal to shift or deform and disengage from the sealed outflow channel. Then, the damping liquid is squeezed out of the damping chamber as the second component moves to the second position. During the process of the damping liquid being squeezed out, it provides resistance to the movement of the first component, delaying the time it takes for the first component to move to the second position, thereby realizing the delay function of the delay mechanism.

[0012] Furthermore, the second component includes a first mating section and a second mating section located within the first component; the first mating section forms the outflow channel with the first component, and the first seal is sleeved on the first mating section and abuts against the inner wall of the first component to seal the outflow channel; the second mating section and the first component cooperate to form a receiving space, and when the second component moves along a first direction from the first position to the second position, the first seal is disengaged from the first mating section by the force of the damping liquid in the outflow channel and is received by the receiving space.

[0013] Furthermore, the first mating section is provided with a positioning groove for positioning the first seal. The positioning groove has a first groove wall and a second groove wall that are opposite each other along a first direction. The first groove wall is closer to the second mating section than the second groove wall, and the first groove wall is inclined towards the direction of the second mating section.

[0014] By adopting the above technical solution, the positioning groove can position the first seal, which facilitates the stable installation of the first seal, while the inclined first groove wall can facilitate the first seal to detach from the positioning groove under the action of the damping liquid.

[0015] Furthermore, the first mating section is also provided with a plurality of connecting grooves extending from the second groove wall to the end of the first mating section, and the plurality of connecting grooves are evenly arranged circumferentially.

[0016] Furthermore, the second component also includes a third mating section within the first component, the third mating section being located on the side of the second mating section opposite to the first mating section, and the delay mechanism including a second seal disposed between the third mating section and the first component; during the movement of the second component relative to the first component from the first position to the second position, one of the third mating section and the first component remains stationary with respect to the second seal, while the other slides relative to the second seal and maintains a seal.

[0017] By adopting the above technical solution, during the movement of the second component to the second position, the damping fluid flows from the damping chamber into the receiving space formed by the second mating section and the first component, and the third sealing member seals the side of the receiving space away from the damping chamber to prevent the damping fluid from flowing out of the receiving space to other areas.

[0018] Furthermore, the second mating section includes a central column and a plurality of support ribs arranged at intervals around the central column, with a groove formed between two adjacent support ribs.

[0019] Furthermore, one of the first component and the second component is provided with a guide groove parallel to the first direction, and the other is provided with a guide portion embedded in the guide groove.

[0020] Furthermore, the first component includes a cylinder, a cover, and a third seal. One end of the cylinder is open and is covered by the cover. The cylinder and the cover form a sealing structure that prevents the damping liquid from flowing out through the third seal.

[0021] Furthermore, one of the cylinder and the cover is provided with a locking block, and the other is provided with a locking slot that cooperates with the locking block.

[0022] The second objective of this application is to provide an injection device, which adopts the following technical solution:

[0023] An injection device includes a pushing mechanism and the aforementioned delay mechanism. The pushing mechanism is used to push a drug, and when the pushing action of the pushing mechanism is completed, it triggers relative movement between the first component and the second component in the delay mechanism.

[0024] By adopting the above technical solution, the injection device including the above delay mechanism can effectively prevent the damping liquid from flowing out of the damping chamber before the delay mechanism is activated, thus shortening the delay time and ensuring the accuracy of the delay function of the injection device.

[0025] In summary, this application includes at least one of the following beneficial technical effects: before the delay mechanism is started, the outflow channel connected to the damping chamber is sealed by the first sealing element, thereby effectively preventing the damping liquid from flowing out of the damping chamber before the delay mechanism is started and shortening the delay time, thus ensuring the accuracy of the delay mechanism. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the delay mechanism when the second component is in the first position in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the delay mechanism during the movement of the second component from the first position to the second position in an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the delay mechanism when the second component is about to move to the second position in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the second component in an embodiment of this application;

[0030] Figure 5 This is a partial schematic diagram of the first mating segment and the second mating segment of the second component in an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of a delay mechanism in which the first component in an embodiment of this application is a separate member;

[0032] Figure 7 This is a schematic diagram illustrating the snap-fit ​​structure between the cylinder and the cover in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram illustrating the guiding structure between the first component and the second component in an embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. First component; 11. Cylinder; 111. Protrusion; 12. Cover; 121. Through hole; 13. Third seal; 14. Guide groove; 2. Second component; 21. First mating section; 211. Positioning groove; 212. First groove wall; 213. Second groove wall; 214. Connecting groove; 22. Second mating section; 221. Central column; 222. Support rib; 23. Third mating section; 24. Guide buckle; 3. Damping fluid; 4. First seal; 5. Outflow channel; 6. Receiving space; 7. Second seal. Detailed Implementation

[0035] 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 are only used to explain this application, and should not be construed as limiting this application.

[0036] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "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 based on the orientation or positional relationships shown in the accompanying drawings, are used 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, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] An injection device is capable of injecting its contained medication into the body of the recipient through a needle at the injection site. It typically includes a housing, a vial, an activation mechanism, and a delivery mechanism. The vial is installed inside the housing and includes a bottle body, medication placed inside the vial body, a needle at the distal end of the vial body, and a movable piston at the proximal end of the vial body. The delivery mechanism is used to push the movable piston to inject the medication from the vial body through the needle into the recipient's body. The activation mechanism is operated by the user to trigger the pushing action of the delivery mechanism.

[0039] During actual injection, the injected medication typically needs time to completely drain from the vial and disperse at the injection site. If the needle is immediately removed from the injection site after the injection, the medication may not be completely drained from the vial, and / or may leak out from the injection site, resulting in some medication not being fully injected into the recipient. Some injection device instructions advise users to wait a few seconds after injection before removing the needle, allowing it to remain at the injection site for a period; however, the timing of needle removal depends on the user, which is inconvenient.

[0040] To address this, some injection devices incorporate a delay mechanism that works in conjunction with a push mechanism. When the push mechanism pushes the movable piston of the vial to its furthest point, the delay mechanism's delay action is triggered, and after a certain time interval, it provides visual / auditory / tactile signals to prompt the user that the needle can be withdrawn from the injection site. Other injection devices, in addition to the delay mechanism, further include a needle return mechanism for automatically removing the needle from the injection site. This needle return mechanism works in conjunction with the delay mechanism; when the push mechanism pushes the movable piston of the vial to its furthest point, the delay mechanism's delay action is triggered, and after a certain time interval, the needle return mechanism's return action is triggered to automatically remove the needle from the injection site.

[0041] In related technologies, a delay mechanism mainly includes a movable delay component and a damper for providing resistance to the delay component. The delay component is usually powered by a dynamic spring, and the damper cooperates with the delay component to form a damping chamber with a pre-set channel. The damping chamber contains a highly viscous liquid. The moving delay component gradually compresses the damping chamber and squeezes the highly viscous liquid out of the damping chamber through the channel. The resistance of the highly viscous liquid is used to delay the movement of the delay component to achieve the delay function. However, some highly viscous liquid may also flow out of the damping chamber through the channel before the delay mechanism is activated. This will reduce the total delay time of the delay mechanism and affect the accuracy of the delay mechanism.

[0042] In the first aspect, the embodiments of this application disclose a delay mechanism that can prevent the damping liquid 3 from flowing out of the damping chamber before the delay mechanism is activated, thereby shortening the delay time and ensuring the accuracy of the delay mechanism.

[0043] Reference Figures 1 to 3The delay mechanism includes a first component 1, a second component 2, a damping fluid 3, and a first seal 4. The first component 1 and the second component 2 are sleeved together. Before the delay mechanism is activated, the second component 2 is in a first position relative to the first component 1. After the delay mechanism is activated, the second component 2 can move relative to the first component 1 from the first position to a second position along a first direction. Furthermore, when the delay action of the delay mechanism is completed, the second component 2 is in the second position relative to the first component 1.

[0044] Specifically, refer to Figure 1 When the second component 2 is in the first position, the first component 1 and the second component 2 cooperate to form a damping chamber for containing the damping fluid 3. The damping chamber is connected to an outflow channel 5 for the damping fluid 3 to flow out. Simultaneously, the first sealing member 4 is located in the outflow channel 5 and is used to seal the outflow channel 5 to prevent the damping process from flowing out of the damping chamber through the outflow channel 5. (Refer to...) Figure 2 and Figure 3 When the second component 2 moves from the first position to the second position, the first seal 4 is disengaged from the state of sealing the outflow channel 5 by the force of the damping liquid 3 in the outflow channel 5, so as to allow the damping liquid 3 to flow out of the damping chamber through the outflow channel 5; and during the movement of the second component 2 from the first position to the second position, the moving second component 2 compresses the internal space of the damping chamber, so that the damping liquid 3 in the damping chamber flows out through the outflow channel 5, and provides resistance to the movement of the second component 2 relative to the first component 1 during the process of the damping liquid 3 flowing out of the damping chamber, thus playing a delaying function.

[0045] Using the above scheme, before the delay mechanism is activated, the outflow channel 5 connected to the damping chamber is sealed by the first seal 4, which effectively prevents the damping liquid 3 from flowing out of the damping chamber before the delay mechanism is activated, thus shortening the delay time and ensuring the accuracy of the delay mechanism. When the delay mechanism is activated, the second component 2 moves from the first position to the second position relative to the first component 1 to compress the damping chamber. The damping liquid 3 in the damping chamber exerts a force on the first seal 4 that seals the outflow channel 5, causing the first seal 4 to shift or deform and disengage from the sealed outflow channel 5. Then, the damping liquid 3 is squeezed out of the damping chamber as the second component 2 moves to the second position. During the process of the damping liquid 3 being squeezed out, it provides resistance to the movement of the first component 1, delaying the time it takes for the first component 1 to move to the second position, thereby realizing the delay function of the delay mechanism.

[0046] It is understandable that the nesting of the first component 1 and the second component 2 indicates a nesting relationship between the two components; this can be either the first component 1 nested outside the second component 2, or the second component 2 nested outside the first component 1. Correspondingly, the ability of the second component 2 to move relative to the first component 1 means that a change in relative position can occur between the two components; this can be either the first component 1 being stationary while the second component 2 is moving, or the second component 2 being stationary while the first component 1 is moving, or the first component 1 and the second component 2 moving simultaneously but with one of their speeds or directions of motion being different.

[0047] It should be noted that both the first position and the second position refer to the relative positions of the second component 2 with respect to the first component 1. In the foregoing, the second component 2 being in the first position indicates that the second component 2 is in a first position relative to the first component 1. Furthermore, the foregoing description does not limit the specific form of movement of the second component 2 relative to the first component 1. That is, in some specific examples, the second component 2 can move from the first position to the second position by translation relative to the first component 1; in other specific examples, the second component 2 can move from the first position to the second position by rotation relative to the first component 1.

[0048] It should also be noted that the damping fluid 3 is preferably a liquid with a relatively high dynamic viscosity. In some embodiments, a liquid with a dynamic viscosity of 5000 cP to 100000 cP can be selected as the damping fluid 3; in some more specific examples, the damping fluid 3 can be damping oil, silicone oil, or glycerin. In addition, in other embodiments, liquids with relatively low dynamic viscosity can also be used, for example, in some embodiments, a liquid with a dynamic viscosity of less than 5000 cP can be selected as the damping fluid 3.

[0049] Reference Figure 1 In some embodiments, both the first component 1 and the second component 2 are generally rod-shaped structures. The first component 1 has a cylindrical cavity with a bottom, and the second component 2 extends into the cylindrical cavity of the first component 1. The end of the second component 2 near the bottom of the cylindrical cavity mates with the interior of the first component 1 to form a damping chamber that can accommodate the damping fluid 3. Simultaneously, the second component 2 can move within the cylindrical cavity along a first direction near the bottom of the cylindrical cavity to compress the damping chamber. Furthermore, the first direction is parallel to the axial length direction of the first component 1 and the second component 2.

[0050] Reference Figure 1 and Figure 4In some embodiments, the second component 2 includes a first mating section 21 and a second mating section 22 located within the first component 1, arranged along a second direction away from the first direction. A gap exists between the first mating section 21 and the first component 1 in a direction perpendicular to the first direction, forming an outflow channel 5. A first seal 4 is annular and fitted onto the outer wall of the first mating section 21, while simultaneously abutting against the inner wall of the first component 1 to seal the outflow channel 5. A gap exists between the second mating section 22 and the first component 1 in a direction perpendicular to the first direction, thus forming a receiving space 6. The gap for forming the receiving space 6 is greater than the maximum gap that the first seal 4 can seal. Therefore, when the second component 2 moves along the first direction from a first position to a second position, the first seal 4 will be disengaged from the first mating section 21 by the force of the damping liquid 3 in the outflow channel 5 and accommodated by the receiving space 6. In this situation, the first seal 4 loses its sealing effect on the outflow channel 5, so that when the second component 2 continues to move to the second position and compresses the damping chamber, the damping liquid 3 in the damping chamber can flow to the receiving space 6 through the outflow channel 5.

[0051] Furthermore, referring to Figure 4 and Figure 5 In some specific examples, the first mating section 21 is also provided with a positioning groove 211 for positioning the first seal 4, which facilitates the stable installation of the first seal 4; at the same time, the positioning groove 211 has a first groove wall 212 and a second groove wall 213 opposite to each other along a first direction, wherein the first groove wall 212 is closer to the second mating section 22 than the second groove wall 213, and the first groove wall 212 is configured to be inclined toward the direction of the second mating section 22, which facilitates the first seal 4 to disengage from the positioning groove 211 under the action of the damping liquid 3.

[0052] Additionally, refer to Figure 4 and Figure 5 In some specific examples, the first mating section 21 is also provided with a plurality of connecting grooves 214 extending from the second groove wall 213 to the end of the first mating section 21. The plurality of connecting grooves 214 are evenly arranged in the circumferential direction to allow the damping liquid 3 to pass through. At the same time, the position and width of the connecting grooves 214 are configured such that the damping liquid 3 passing through the connecting grooves 214 can at least impact the lower half of the first seal 4 near the first mating section 21, so that when the second component 2 moves from the first position to the second position, it is easier for the first seal 4 to disengage from the positioning groove 211 of the first mating section 21.

[0053] Continue to refer to Figure 1 and Figure 5To prevent the damping liquid 3 within the containment space 6 from flowing out to other areas, in some embodiments, the second component 2 further includes a third mating section 23 located within the first component 1 and forming a sliding seal with the first component 1. Specifically, the third mating section 23 is located on the side of the second mating section 22 opposite to the first mating section 21, that is, the first mating section 21, the second mating section 22, and the third mating section 23 are arranged sequentially along a second direction opposite to the first direction. Meanwhile, the delay mechanism includes a second seal 7 disposed between the third mating section 23 and the first component 1; during the movement of the second component 2 relative to the first component 1 from a first position to a second position, one of the third mating section 23 and the first component 1 remains stationary with respect to the second seal 7, while the other slides relative to the second seal 7 and maintains a seal. In some specific examples, the second seal 7 is a sealing ring fixedly sleeved on the third mating section 23 of the second component 2, and the outer periphery of the second seal 7 abuts against the inner wall of the first component 1; while in other examples, the second seal 7 can be configured as a sealing ring fixedly embedded inside the first component 1, and the inner periphery of the second seal 7 abuts against the outer wall of the third mating section 23 of the second component 2.

[0054] Understandably, the second mating section 22 needs to serve as both a connecting section between the first mating section 21 and the third mating section 23, and also needs to cooperate with the first component 1 to form a sufficient accommodating space 6 for the damping fluid 3. This requires the second mating section 22 to have sufficient groove space and sufficient supporting force; correspondingly, referring to... Figure 4 and Figure 5 In some embodiments, the second mating section 22 includes a central column 221 arranged parallel to the first direction and a plurality of support ribs 222 arranged circumferentially around the central column 221, with a groove space formed between adjacent support ribs 222.

[0055] It is understood that the first component 1 mentioned above can be a single component or an assembly of multiple components. Specifically, refer to... Figure 6 In some specific embodiments, the first component 1 is configured as a cylindrical member with one end open and the other end closed; in this embodiment, the inner cavity of the cylindrical member serves as the cylindrical inner cavity of the first component 1, and the closed end of the cylindrical member serves as the bottom of the cylindrical inner cavity. (Refer to...) Figure 7 In some other specific embodiments, the first component 1 is configured as a cylindrical assembly formed by assembling multiple components; specifically, it includes a cylindrical body 11, a cover 12, and a third sealing element 13, wherein the cylindrical body 11 is open at both ends, and one of the openings is closed by the cover 12; at the same time, the cylindrical body 11 and the cover 12 form a sealing structure that prevents the damping liquid 3 from flowing out through the third sealing element 13; in this embodiment, the inner cavity of the cylindrical body 11 serves as the cylindrical inner cavity of the first component 1, and the cover 12 serves as the bottom of the cylindrical inner cavity.

[0056] Furthermore, in an embodiment where the first component 1 includes a cylinder 11 and a cover 12, a corresponding engaging structure is also provided between the cylinder 11 and the cover 12; that is, one of the cylinder 11 and the cover 12 is provided with a locking block, and the other is provided with a locking slot that engages with the locking block, forming an engaging structure. (Refer to...) Figure 7 In some specific examples, the bayonet is configured as a through hole 121 on the side wall of the cover 12, and the locking block is configured as a protrusion 111 protruding from the outer wall of the cylinder 11.

[0057] Furthermore, in some embodiments, in order to maintain smooth movement of the second component 2 relative to the first component 1 in the first direction, a guide structure is also provided between the first component 1 and the second component 2; specifically, one of the first component 1 and the second component 2 is provided with a guide groove 14 parallel to the first direction, and the other is provided with a guide portion embedded in the guide groove 14. (Refer to...) Figure 8 In some specific examples, the guide groove 14 is formed on the side wall of the first component 1, and the guide portion is configured as a guide latch 24 protruding from the side wall of the second component 2. The guide latch 24 can slide in the guide groove 14 to guide smooth movement between the second component 2 and the first component 1.

[0058] Secondly, embodiments of this application also disclose an injection device, which includes the aforementioned delay mechanism, to ensure the accuracy of the delay function of the injection device.

[0059] In some examples, the injection device includes a pushing mechanism and the aforementioned delay mechanism. The pushing mechanism pushes the drug, and when the pushing action of the pushing mechanism is completed, it triggers relative movement between the first component 1 and the second component 2 in the delay mechanism. When the second component 2 moves to a second position relative to the first component 1, the delay action is completed and a prompt signal is given. The prompt signal can be a visual signal, an auditory signal, or a tactile signal, which allows the user to withdraw the needle from the injection site.

[0060] In other examples, the injection device includes a pushing mechanism, a needle return mechanism, and the aforementioned delay mechanism, wherein the pushing mechanism is used to push the drug, the needle return mechanism is used to automatically withdraw the needle from the injection site; when the pushing action of the pushing mechanism is completed, it triggers the relative movement between the first component 1 and the second component 2 in the delay mechanism; when the second component 2 moves relative to the first component 1 to a second position, the delay action is completed and the needle return action of the needle return mechanism is triggered, and the needle return mechanism withdraws the needle from the injection site.

[0061] 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 this application. 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.

[0062] Although embodiments of this application 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 this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A delay mechanism, characterized in that, Includes a first component, a second component, a damping fluid, and a first seal; The first component and the second component are nested together, and the first component and the second component cooperate to form a damping chamber for containing the damping liquid, and the damping chamber is connected to an outflow channel for the damping liquid to flow out. The second component is capable of moving from a first position to a second position relative to the first component along a first direction, and is capable of compressing the damping chamber during the movement of the second component from the first position to the second position; When the second component is in the first position, the first seal seals the outflow channel to prevent the damping fluid from flowing out of the damping chamber through the outflow channel; When the second component moves from the first position to the second position, the first seal is disengaged from sealing the outflow channel by the force of the damping liquid in the outflow channel, so as to allow the damping liquid to flow out from the damping chamber through the outflow channel.

2. The delay mechanism according to claim 1, characterized in that, The second component includes a first mating section and a second mating section located within the first component; the first mating section forms the outflow channel with the first component, and the first sealing member is sleeved on the first mating section and abuts against the inner wall of the first component to seal the outflow channel; The second mating section and the first component form a receiving space. When the second component moves from the first position to the second position along the first direction, the first seal is disengaged from the first mating section by the force of the damping liquid in the outflow channel and is received by the receiving space.

3. The delay mechanism according to claim 2, characterized in that, The first mating section is provided with a positioning groove for positioning the first seal. The positioning groove has a first groove wall and a second groove wall that are opposite each other along a first direction. The first groove wall is closer to the second mating section than the second groove wall, and the first groove wall is inclined towards the direction of the second mating section.

4. The delay mechanism according to claim 3, characterized in that, The first mating section is also provided with a plurality of connecting grooves extending from the second groove wall to the end of the first mating section, and the plurality of connecting grooves are evenly arranged circumferentially.

5. The delay mechanism according to claim 2, characterized in that, The second component further includes a third mating section within the first component, the third mating section being located on the side of the second mating section opposite to the first mating section, and the delay mechanism including a second seal disposed between the third mating section and the first component; during the movement of the second component relative to the first component from the first position to the second position, one of the third mating section and the first component remains stationary with respect to the second seal, while the other slides relative to the second seal and maintains a seal.

6. The delay mechanism according to claim 2, characterized in that, The second mating section includes a central column and a plurality of support ribs arranged at intervals around the central column, with a groove formed between two adjacent support ribs.

7. The delay mechanism according to claim 2, characterized in that, One of the first component and the second component is provided with a guide groove parallel to the first direction, and the other component is provided with a guide portion embedded in the guide groove.

8. The delay mechanism according to claim 1, characterized in that, The first component includes a cylinder, a cover, and a third sealing element. One end of the cylinder is open and is covered by the cover. The cylinder and the cover form a sealing structure that prevents the damping liquid from flowing out through the third sealing element.

9. The delay mechanism according to claim 8, characterized in that, One of the cylinder and the cover is provided with a locking block, and the other is provided with a locking slot that cooperates with the locking block.

10. An injection device, characterized in that, It includes a pushing mechanism and a delay mechanism as described in any one of claims 1 to 9, wherein the pushing mechanism is used to push a drug, and when the pushing action of the pushing mechanism is completed, it triggers relative movement between the first component and the second component in the delay mechanism.

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