Delay mechanism and injection apparatus

Abstract

The present application relates to a delay mechanism and an injection apparatus, the delay mechanism comprises a first member, a second member, and a damping liquid. The first member and the second member are sleeved with each other, and a damping chamber for accommodating the damping liquid is formed therebetween. Before the delay mechanism is triggered and activated, the damping chamber is in a sealed state that restricts the outflow of the damping liquid, thereby effectively preventing the damping liquid from flowing out of the damping chamber before the delay mechanism is activated and shortening the delay duration, and ensuring the accuracy of the delay mechanism. After the delay mechanism is triggered and activated, the first member and the second member move relative to each other to compress the damping chamber, and a channel is formed for the damping liquid to flow out of the damping chamber, thereby achieving the delay function. The injection apparatus provided by the present application comprises the delay mechanism described above, and the injection apparatus is capable of activating the delay mechanism after a pushing mechanism completes a pushing action, thereby providing convenience for a user of the injection apparatus.

Description

Delay mechanism and injection device Technical Field

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

[0002] An injection device is used to inject medication contained within it into a patient's body through a needle at the injection site. It typically includes a housing, a vial, an activation mechanism, and a delivery mechanism. The vial is housed within the housing and includes a bottle body, medication contained within 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 pushes the movable piston to inject the medication from the vial body through the needle into the patient's body. The activation mechanism is operated by the user to trigger the delivery mechanism.

[0003] During actual injection, the injected medication typically requires 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, or it may leak out of the injection site, or both. This results in some medication not being fully injected into the patient's body, leading to a lower actual dose than the prescribed dose and thus failing to achieve the expected therapeutic effect. For example, for diabetic patients, the accuracy of insulin dosage directly affects blood sugar control and life safety. If the user removes the needle too early, incomplete drainage or tissue diffusion pressure may prevent the insulin from being fully injected, potentially resulting in a lower actual dose than the prescription, leading to uncontrolled blood sugar. Some injection device instructions suggest that users wait a few seconds after injection before removing the needle, allowing it to remain at the injection site for a period of time. However, the timing of needle removal depends on the user and relies entirely on their experience and patience. This method is often overlooked or improperly executed during frequent daily injections, which is inconvenient for users.

[0004] To address this, some injection devices are equipped with 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 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. Some injection devices further include a needle return mechanism for automatically removing the needle from the patient's 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 is triggered, and after a certain time interval, it triggers the needle return mechanism to automatically remove the needle from the patient's injection site.

[0005] In related technologies, a time-delay mechanism mainly includes a movable time-delay component and a damper for providing resistance to the time-delay component. The time-delay component is usually powered by a dynamic spring, and the damper cooperates with the time-delay component to form a damping chamber with a pre-set channel. The damping chamber contains a highly viscous liquid. The movable time-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 slow down the movement of the time-delay component to achieve the time-delay function. However, some highly viscous liquid may also flow out of the damping chamber through the channel before the time-delay mechanism is activated. This will reduce the total delay time of the time-delay mechanism and affect its accuracy. Summary of the Invention

[0006] One of the objectives of this application is to provide a delay mechanism that prevents the damping fluid 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. The technical solution adopted is as follows:

[0007] A time delay mechanism includes a first component, a second component, and a damping fluid. The first component and the second component are sleeved together, and a damping chamber for containing the damping fluid is formed between them. The second component is movable relative to the first component.

[0008] Before the delay mechanism is triggered, the damping chamber is in a sealed state that restricts the outflow of the damping fluid;

[0009] After the delay mechanism is triggered, the first component and the second component move relative to each other to compress the damping chamber and form a channel for the damping fluid to flow out of the damping chamber.

[0010] By adopting the above technical solution, before the delay mechanism is triggered and started, the damping chamber is in a sealed state that restricts the outflow of damping liquid, 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; after the delay mechanism is triggered and started, the damping liquid can flow out of the damping chamber through the channel to realize the delay function of the delay mechanism.

[0011] Furthermore, the delay mechanism further includes a first seal and a filling fluid; the second component is movable relative to the first component from a first position to a second position to a third position; when the second component is in the first position, the first component, the second component, and the first seal cooperate to form a damping chamber that prevents the outflow of the damping fluid, and the damping fluid and the filling fluid are contained in the damping chamber; during the movement of the second component from the first position to the second position, the first component and the second component cooperate through the first seal to form a sliding sealing structure that prevents the passage of the damping fluid, the damping chamber is compressed and the filling fluid is compressed and / or discharged; during the movement of the second component from the second position to the third position, the damping chamber is connected to a channel for the damping fluid to flow out, the damping chamber is compressed and the damping fluid is squeezed out of the damping chamber.

[0012] By adopting the above technical solution, after the delay mechanism is triggered, the first component will move a certain distance relative to the second component, compress the damping chamber and form a channel for the damping liquid to flow out of the damping chamber. In the subsequent movement of the first component, the damping chamber will continue to be compressed, thereby squeezing the damping liquid out of the damping chamber. During the process of the damping liquid being squeezed out, it provides resistance to the movement of the first component, thereby delaying the time for the first component to move to the third position and realizing the delay function of the delay mechanism.

[0013] Furthermore, the first seal is positioned between the first component and the second component, and one of the first component and the second component remains stationary relative to the first seal, while the other includes a sealing fit section and a clearance fit section; during the movement of the second component from the first position to the second position, the first seal engages with the sealing fit section to form the sliding seal structure through the first seal; during the movement of the second component from the second position to the third position, the first seal engages with the clearance fit section to create a gap between the first seal, the first component, and the second component, forming a channel for the damping fluid to flow out of the damping chamber.

[0014] Furthermore, the surface of the clearance fit section is provided with a guide groove, and the bottom of the guide groove has a gap with the first sealing member to form a channel for the damping liquid to flow out from the damping chamber.

[0015] Furthermore, the first component is sleeved on the outside of the second component, the outer wall of the second component is provided with an annular groove, and the first sealing element is fixedly sleeved in the annular groove on the outer wall of the second component so that the first sealing element and the second component remain relatively stationary; the inner wall of the first component includes the sealing mating section and the clearance mating section distributed along the translational direction of the second component, the first component abuts against the first sealing element on the inner wall of the sealing mating section and can slide relative to it to realize a sliding sealing structure between the first component and the second component at the first sealing element; the first component has a gap between the inner wall of the clearance mating section and the first sealing element, forming a channel for the damping liquid to flow out.

[0016] Furthermore, the second component has a guide groove extending in the translational direction on the outer wall of the clearance fitting section, and the bottom of the guide groove has a gap with the first sealing member to form a channel for the damping liquid to flow out.

[0017] Preferably, the first component is sleeved on the outside of the second component, and the first component has a larger inner diameter in the clearance fit section than in the sealing fit section, so that the first component is isolated from the first seal in the clearance fit section, thereby forming a channel for the damping liquid to flow out.

[0018] Preferably, the delay mechanism further includes a receiving chamber, during which the second component moves from the second position to the third position, the channel through which the damping fluid flows out of the damping chamber is connected to the receiving chamber, and the damping fluid can be squeezed and flow from the damping chamber to the receiving chamber.

[0019] Furthermore, the delay mechanism also includes a second seal, and the first component, the second component, the first seal, and the second seal cooperate to form the receiving chamber; one of the first component and the second component remains stationary relative to the second seal and is provided with a groove section, while the other slides relative to the second seal and maintains a seal, and the groove section is located between the first seal and the second seal and constitutes part of the cavity wall of the receiving chamber.

[0020] Furthermore, the groove segment includes spaced-apart support ribs, a groove is formed between two adjacent support ribs, and the support ribs are provided with a through port for connecting two adjacent grooves.

[0021] Furthermore, the groove segment includes a centrally located central column, the supporting ribs are evenly distributed around the central column, and the guide opening is configured as a radially spaced edge recess on the supporting rib away from the central column.

[0022] Preferably, the first component is sleeved on the outside of the second component, the outer wall of the second component is provided with an annular groove, and the first seal and the second seal are elastic sealing rings that are spaced apart and sleeved in the annular groove of the outer wall of the second component.

[0023] Furthermore, the second seal is located on the side of the first seal away from the damping chamber, and the first component, the second component, the first seal, and the second seal cooperate to form the receiving chamber; the first seal forms the boundary area between the damping chamber and the receiving chamber, and the first seal cooperates with the clearance fit section to form a channel for the damping fluid to flow out, connecting the damping chamber and the receiving chamber.

[0024] Preferably, the first component includes a receiving space with a bottom, one end of the second component extends into the receiving space, and the end of the second component extending into the receiving space and the bottom of the receiving space respectively constitute part of the cavity wall of the damping chamber.

[0025] Furthermore, the first component includes a cylinder, a cover, and a third seal. One end opening of the cylinder is covered by the cover to form the accommodating space with a bottom. The cylinder and the cover form a sealing structure that prevents the damping liquid from flowing out through the third seal.

[0026] Furthermore, the outer wall of the cylinder body covered by the cover body is provided with an annular groove, and the third sealing member is an elastic sealing ring fitted in the annular groove, and the outer wall of the third sealing member abuts against the inner wall of the cover body.

[0027] Furthermore, the first component includes an integrally formed cylindrical wall and a cylindrical bottom, forming the accommodating space having a bottom.

[0028] Further, the first component translates relative to the second component and moves from the first position to the third position via the second position; or, the first component rotates relative to the second component and moves from the first position to the third position via the second position.

[0029] Furthermore, the first component is cylindrical and includes a receiving space with a bottom; the second component is rod-shaped and extends into the receiving space of the first component; the central axes of the first component and the second component are collinear, and the second component rotates relative to the first component about its central axis.

[0030] The second objective of this application provides an injection device, which includes the delay mechanism provided in the first objective. This injection device can activate the delay mechanism after the pushing mechanism completes its pushing action, and adopts the following technical solution:

[0031] 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.

[0032] Furthermore, a prompt signal is given when the first component moves to the third position relative to the second component; or a return needle action is triggered when the first component moves to the third position relative to the second component; or a prompt signal is given and a return needle action is triggered when the first component moves to the third position relative to the second component.

[0033] By adopting the above technical solution, the injection device can activate the delay mechanism after the push mechanism completes the push action, and give a prompt signal after the delay mechanism completes the delay action so that the user can pull out the needle based on the signal, or trigger the needle return action after the delay mechanism completes the delay action, thus providing convenience for the user of the injection device.

[0034] In summary, this application has at least the following beneficial effects: before the delay mechanism is triggered, the damping chamber is in a sealed state that restricts the outflow of damping liquid, thereby effectively preventing the damping liquid from flowing out of the damping chamber before the delay mechanism is activated and shortening the delay time, thus ensuring the accuracy of the delay mechanism; after the delay mechanism is triggered, the first component moves a certain distance relative to the second component, compressing the damping chamber and forming a channel for the damping liquid to flow out of the damping chamber, and continues to compress the damping chamber in the subsequent movement of the first component, thereby squeezing the damping liquid out of the damping chamber. During the process of the damping liquid being squeezed out, it provides resistance to the movement of the first component, thereby delaying the time for the first component to move to the third position and realizing the delay function of the delay mechanism.

[0035] One of the objectives of this application is to provide a time delay mechanism, which can also employ the following technical solutions:

[0036] A time-delay mechanism includes a first component, a second component, a damping fluid, and a first seal.

[0037] 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.

[0038] 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;

[0039] 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.

[0040] 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 sealing element, thereby 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 sealing element sealing the outflow channel, causing the first sealing element 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, thus realizing the delay function of the delay mechanism.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Preferably, 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 includes 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.

[0046] 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.

[0047] Preferably, 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.

[0048] Preferably, 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.

[0049] Preferably, 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.

[0050] 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.

[0051] The second objective of this application provides an injection device that includes the delay mechanism provided in the first objective. This injection device can activate the delay mechanism after the pushing mechanism completes its pushing action, and it adopts the following technical solution:

[0052] 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.

[0053] By adopting the above technical solution, the injection device including the aforementioned 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. Furthermore, a prompt signal is given when the first component moves to the second position relative to the second component; or a needle return action is triggered when the first component moves to the second position relative to the second component.

[0054] 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

[0055] Figure 1 is a schematic diagram of the second component during translation from the first position to the second position in one embodiment of this application;

[0056] Figure 2 is a schematic diagram of the second component during translation from the second position to the third position in one embodiment of this application;

[0057] Figure 3 is a schematic diagram of the second component in a third position in one embodiment of this application;

[0058] Figure 4 is a schematic diagram of the second component during translation from the first position to the second position in one embodiment of this application;

[0059] Figure 5 is a schematic diagram showing the clearance fit section of the first component in one embodiment of this application;

[0060] Figure 6 is a schematic diagram showing the clearance fit section of the first component in one embodiment of this application;

[0061] Figure 7 is a schematic diagram showing the groove segment of the second component in one embodiment of this application;

[0062] Figure 8 is a cross-sectional view of the groove segment of the second component in one embodiment of this application;

[0063] Figure 9 is a cross-sectional view of an example of the rotation of the second component relative to the first component in one embodiment of this application;

[0064] Figure 10 is an exploded view of the second component and the first seal in one embodiment of this application;

[0065] Figure 11 is a schematic diagram of the second component rotating from the first position to the second position in one embodiment of this application;

[0066] Figure 12 is a schematic diagram of the second component rotating from the second position to the third position in one embodiment of this application.

[0067] Figure 13 is a schematic diagram of a delay mechanism in one embodiment of this application when the second component is in the first position;

[0068] Figure 14 is a schematic diagram of a delay mechanism during the movement of the second component from the first position to the second position in one embodiment of this application;

[0069] Figure 15 is a schematic diagram of the delay mechanism when the second component is about to move to the second position in one embodiment of this application;

[0070] Figure 16 is a schematic diagram of the second component in one embodiment of this application;

[0071] Figure 17 is a partial schematic diagram of the first mating segment and the second mating segment of the second component in one embodiment of this application;

[0072] Figure 18 is a schematic diagram of a delay mechanism in which the first component adopts a separate component in one embodiment of this application;

[0073] Figure 19 is a schematic diagram illustrating the snap-fit ​​structure between the cylinder and the cover in one embodiment of this application;

[0074] Figure 20 is a schematic diagram illustrating the guide structure between the first component and the second component in one embodiment of this application.

[0075] Explanation of reference numerals in the attached drawings: 110, First component; 111, Cylinder; 112, Cover; 113, Third seal; 114, Partition; 120, Second component; 121, Tank section; 121A, Central column; 121B, Support rib; 121C, Through port; 122, Rod-shaped body; 123, Extension; 123A, Rotating shaft; 130, First seal; 131, Annular part; 132, U-shaped part; 140, Damping fluid; 150, Damping chamber; 160, Sealing section; 170, Clearance section; 171, Guide groove; 180, Receiving chamber; 190, Second seal; 210. First component; 211. Cylinder body; 211A. Protrusion; 212. Cover; 212A. Through hole; 213. Third seal; 214. Guide groove; 220. Second component; 221. First mating section; 221A. Positioning groove; 221B. First groove wall; 221C. Second groove wall; 221D. Connecting groove; 222. Second mating section; 222A. Central column; 222B. Support rib; 223. Third mating section; 224. Guide buckle; 230. Damping fluid; 240. First seal; 250. Outflow channel; 260. Receiving space; 270. Second seal. Detailed Implementation

[0076] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0077] In the description of this invention, 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, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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 the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0078] An injection device is used to inject its contents of medication into a patient's body through a needle at the injection site. It typically includes a housing, a vial, an activation mechanism, and a delivery mechanism. The vial is housed within the housing and includes a bottle body, medication contained within 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 pushes the movable piston to inject the medication from the vial body through the needle into the patient's body. The activation mechanism is operated by the user to trigger the delivery mechanism.

[0079] 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. If the needle of the injection device is pulled out of the injection site immediately after the injection, the medication may not be completely expelled from the vial, or the medication may flow out from the injection site, or the medication may not be completely expelled from the vial and may flow out from the injection site. This will result in some medication not being completely injected into the patient's body. To address this, some injection devices are equipped with 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 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. Some injection devices further include a needle return mechanism for automatically removing the needle from the patient's 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 is triggered, and after a certain time interval, it triggers the needle return mechanism to automatically remove the needle from the patient's injection site.

[0080] In related technologies, a time-delay mechanism mainly includes a movable time-delay component and a damper for providing resistance to the time-delay component. The time-delay component is usually powered by a dynamic spring, and the damper cooperates with the time-delay component to form a damping chamber with a pre-set channel. The damping chamber contains a highly viscous liquid. The movable time-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 slow down the movement of the time-delay component to achieve the time-delay function. However, some highly viscous liquid may also flow out of the damping chamber through the channel before the time-delay mechanism is activated. This will reduce the total delay time of the time-delay mechanism and affect its accuracy.

[0081] Referring to Figures 1 to 12, the following embodiments of this application disclose a delay mechanism and an injection device using the delay mechanism. The delay mechanism can prevent the damping liquid from flowing out of the damping chamber before the delay mechanism is activated, thereby ensuring the accuracy of the delay mechanism.

[0082] Referring to Figures 1 to 12, the delay mechanism includes a first component 110, a second component 120, a first seal 130, a damping fluid 140, and a filling fluid. The first component 110 and the second component 120 are sleeved together, and before the delay mechanism is activated, the second component 120 is in a first position relative to the first component 110. After the delay mechanism is activated, the second component 120 can move relative to the first component 110 from the first position through a second position to a third position. Figures 1 and 2, and Figures 11 and 12 illustrate this movement process in some embodiments. Simultaneously, after the extension action of the delay mechanism is completed, the second component 120 is in a third position relative to the first component 110.

[0083] Specifically, when the second component 120 is in the first position, the first component 110, the second component 120 and the first seal 130 cooperate to form a damping chamber 150, in which the damping liquid 140 and the filling fluid are both contained, and the damping chamber 150 is configured to prevent the damping liquid 140 from flowing out, thereby preventing the damping liquid 140 from flowing out of the damping chamber 150 before the delay mechanism is activated. During the movement of the second component 120 from the first position to the second position, the first component 110 and the second component 120 cooperate through the first seal 130 to form a sliding seal structure. This sliding seal structure allows the first component 110 and the second component 120 to move relative to each other and forms a seal through the first seal 130 to prevent the damping fluid 140 from passing through. During this period, the damping chamber 150 is compressed and the filling fluid is compressed and / or discharged. During the movement of the second component 120 from the second position to the third position, the damping chamber 150 is connected to a channel for the damping fluid 140 to flow out, so that the damping chamber 150 is compressed and the damping fluid 140 is squeezed out of the damping chamber 150. The process of the damping fluid 140 being squeezed out of the damping chamber 150 provides resistance to the movement of the second component 120 relative to the first component 110, thereby realizing the delay function of the delay mechanism.

[0084] Using the above scheme, before the delay mechanism is triggered, the damping chamber 150 is in a sealed state that restricts the outflow of the damping liquid 140, thereby effectively preventing the damping liquid 140 from flowing out of the damping chamber 150 before the delay mechanism is activated, thus shortening the delay time and ensuring the accuracy of the delay mechanism. After the delay mechanism is triggered, the first component 110 will move a certain distance relative to the second component 120, compressing the damping chamber 150 and forming a channel for the damping liquid 140 to flow out of the damping chamber 150. In the subsequent movement of the first component 110, it continues to compress the damping chamber 150, thereby squeezing the damping liquid 140 out of the damping chamber 150. During the process of the damping liquid 140 being squeezed out, it provides resistance to the movement of the first component 110, thereby delaying the time for the first component 110 to move to the third position and realizing the delay function of the delay mechanism.

[0085] It is understood that the nesting of the first component 110 and the second component 120 indicates a nesting relationship between the two components; this can mean that the first component 110 is nested outside the second component 120, or that the second component 120 is nested outside the first component 110. Correspondingly, the ability of the second component 120 to move relative to the first component 110 after the delay mechanism is activated indicates a relative positional change between the first component 110 and the second component 120; this can be a relative movement formed by the first component 110 being stationary and the second component 120 moving, or a relative movement formed by the second component 120 being stationary and the first component 110 moving, or a relative movement formed by the simultaneous movement of the first component 110 and the second component 120 but with a difference in speed or direction. Furthermore, the first position, second position, and third position all represent the relative position of the second component 120 based on the first component 110. It is understood that the second component 120 being in the first position means that the second component 120 is in a first position relative to the first component 110.

[0086] It should be noted that the damping fluid 140 and the filling fluid are simultaneously contained in the damping chamber 150, indicating that in this case, the total volume of the damping fluid 140 is less than the total volume of the damping chamber 150, and the difference between the two is filled by the filling fluid. The damping fluid 140 is preferably a liquid with 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 140; in some more specific examples, the damping fluid 140 can be damping oil, silicone oil, or glycerin. Furthermore, in other embodiments, liquids with relatively low dynamic viscosity can also be used, for example, in some embodiments, a liquid with a dynamic viscosity less than 5000 cP can be selected as the damping fluid 140.

[0087] Accordingly, in some specific embodiments, the filling fluid is a filling gas, which can be directly discharged or compressed as the damping chamber 150 is compressed. Further, the filling gas can be a gas that does not chemically react with the damping liquid 140; air can be used directly if the aforementioned requirements are met. In other specific embodiments, the filling fluid is a filling liquid, and the filling liquid can be compressed as the damping chamber 150 is compressed. In some specific examples, the filling liquid is a liquid that does not chemically react with the damping liquid 140 and is easily compressible, preferably a volatile liquid; for example, alcohol, gasoline, kerosene, acetone, toluene, xylene, methanol, diethyl ether, chloroform, carbon tetrachloride, ammonia, acetic acid, benzene, formaldehyde, or petroleum ether.

[0088] Furthermore, in some embodiments where the filling fluid is a gas, the damping chamber 150 during the movement of the second component 120 from the first position to the second position is configured to be gas-sealed, such that the filling gas in the damping chamber 150 is compressed as the damping chamber 150 is compressed during this period; in other embodiments, the damping chamber 150 during the movement of the second component 120 from the first position to the second position is configured to allow gas to be discharged, and depending on the different positions of the discharge outlet and the different usage postures of the injection device, the filling gas in the damping chamber 150 may be directly discharged as the damping chamber 150 is compressed during actual use, or it may be partially discharged and partially compressed as the damping chamber 150 is compressed.

[0089] It should also be noted that during the movement of the second component 120 relative to the first component 110 from the first position to the second position, the damping chamber 150 is in a state that restricts the outflow of the damping liquid 140. During the movement of the second component 120 relative to the first component 110 from the second position to the third position, the damping chamber 150 is connected to a channel for the outflow of the damping liquid 140. The second position can be regarded as the critical position of the damping chamber 150 from restricting the outflow of the damping liquid 140 to allowing the outflow of the damping liquid 140. Accordingly, in this scheme, the second position of the second component 120 relative to the first component 110 is defined as the position where the damping chamber 150 is just connected to the outflow channel of the damping liquid 140.

[0090] Furthermore, the relative movement between the first component 110 and the second component 120 mentioned above can be a relative translation between the first component 110 and the second component 120, as shown in Figures 1 to 8; or it can be a relative rotation between the first component 110 and the second component 120, as shown in Figures 9 to 12.

[0091] The following describes some embodiments of the relative translation between the first component 110 and the second component 120.

[0092] Referring to Figures 1 to 4, in some embodiments, the second component 120 is translated relative to the first component 110 and moves from a first position through a second position to a third position; wherein the first component 110 is generally cylindrical and includes a receiving space with a bottom, the second component 120 is generally cylindrical and extends into the receiving space of the first component 110. The end of the second component 120 extending into the receiving space and the bottom of the receiving space respectively form part of the cavity wall of the damping chamber 150; at the same time, the central axes of the first component 110 and the second component 120 are collinear, and the second component 120 is translated relative to the first component 110 in a direction parallel to the central axis.

[0093] Referring to Figures 1 to 3, in some specific examples, the first component 110 includes a cylinder 111, a cover 112, and a third seal 113. One end of the cylinder 111 is covered by the cover 112 to form a receiving space with a bottom. Simultaneously, the outer wall of the cylinder 111 covered by the cover 112 has an annular groove, and the third seal 113 is an elastic sealing ring fitted within the annular groove. The outer wall of the third seal 113 abuts against the inner wall of the cover 112, thereby forming a sealing structure between the cylinder 111 and the cover 112 through the third seal 113 to prevent the damping liquid 140 from flowing out. During the use of the injection device, the cover 112 of the first component 110 is usually positioned on the upper side, so that the filling air is closer to the cover 112 relative to the damping liquid 140. If the sealing structure formed by the cover 112 and the cylinder 111 through the third seal 113 is configured to allow the filling gas to pass through, the damping chamber 150 will be compressed and the filling gas will be directly discharged during the movement of the second component 120 relative to the first component 110 from the first position to the second position; if the sealing structure formed by the cover 112 and the cylinder 111 through the third seal 113 is configured to prevent the filling gas from passing through, the damping chamber 150 will be compressed and the filling gas will be compressed during the movement of the second component 120 relative to the first component 110 from the first position to the second position.

[0094] Referring to Figure 4, in some specific examples, the cylinder wall and bottom of the first component 110 are integrally formed to create a receiving space with a bottom; correspondingly, during use of the injection device, the bottom of the receiving space is on the upper side, so that the filling space is closer to the bottom of the receiving space relative to the damping fluid 140. During the movement of the second component 120 relative to the first component 110 from the first position to the second position, the damping chamber 150 is compressed, which compresses the filling fluid.

[0095] Furthermore, in some embodiments where the second component 120 translates relative to the first component 110, the first seal 130 is disposed between the first component 110 and the second component 120, with one of the first component 110 and the second component 120 remaining stationary relative to the first seal 130, and the other including a sealing mating section 160 and a clearance mating section 170. During the movement of the second component 120 from the first position to the second position, the first seal 130 engages with the sealing mating section 160 to form a sliding seal structure between the first component 110 and the second component 120 through the first seal 130; during the movement of the second component 120 from the second position to the third position, the first seal 130 engages with the clearance mating section 170 to create a gap between the first seal 130, the first component 110, and the second component 120, forming a channel for the damping fluid 140 to flow out from the damping chamber 150.

[0096] Referring to Figures 1, 5, and 6, in some specific embodiments, the first component 110 is sleeved outside the second component 120, the first seal 130 is a sealing ring, and the first seal 130 is fixedly sleeved in the annular groove on the outer wall of the second component 120 so that the first seal 130 and the second component 120 remain relatively stationary. The inner wall of the first component 110 includes a sealing mating section 160 and a clearance mating section 170 distributed along the translational direction of the second component 120. The first component 110 abuts against the first seal 130 on the inner wall of the sealing mating section 160 and can slide relative to it, thereby achieving a sliding sealing structure between the first component 110 and the second component 120 at the first seal 130. Simultaneously, the first component 110 has a gap between itself and the first seal 130 on the inner wall of the clearance mating section 170, thereby forming a channel for the damping liquid 140 to flow out. Referring specifically to Figures 1 and 4, in some specific examples, the sealing section 160 and the clearance section 170 of the first component 110 are both located in the cylinder 111. The cylinder 111 of the first component 110 has a guide groove 171 extending in the translational direction on the inner wall of the clearance section 170. The bottom of the guide groove 171 has a gap with the first seal 130, thereby forming a channel for the damping liquid 140 to flow out. Referring specifically to Figures 1 and 5, in other specific examples, the sealing section 160 and the clearance section 170 of the first component 110 are both located in the cylinder 111. The cylinder 111 of the first component 110 has a larger inner diameter in the clearance section 170 than in the sealing section 160, so that the first component 110 is isolated from the first seal 130 in the clearance section 170, thereby forming a channel for the damping liquid 140 to flow out.

[0097] In other specific embodiments, the first component 110 is sleeved outside the second component 120, the first seal 130 is configured as a sealing ring embedded in an annular groove on the inner wall of the first component 110, and the second component 120 is configured such that its outer wall includes a sealing mating section 160 and a clearance mating section 170 distributed along the translational direction. The second component 120 abuts against the first seal 130 on the outer wall of the sealing mating section 160 and can slide relative to it, thereby achieving a sliding sealing structure between the first component 110 and the second component 120 at the first seal 130; simultaneously, the second component 120 has a gap between its outer wall of the clearance mating section 170 and the first seal 130, thus forming a channel for the damping liquid 140 to flow out. In some specific examples, the second component 120 has a guide groove 171 extending in the translational direction on the outer wall of the clearance fit section 170, and the bottom of the guide groove 171 has a gap with the first seal 130 to form a channel for the damping liquid 140 to flow out; in other specific examples, the second component 120 has a smaller outer diameter in the clearance fit section 170 than the sealing fit section 160, so that the second component 120 is separated from the first seal 130 in the clearance fit section 170 to form a channel for the damping liquid 140 to flow out.

[0098] Furthermore, referring to Figures 7 and 8, the delay mechanism also includes a second seal 190. The first component 110, the second component 120, the first seal 130, and the second seal 190 cooperate to form a receiving chamber 180. During the movement of the second component 120 from the second position to the third position, the channel through which the damping fluid 140 flows out of the damping chamber 150 is connected to the receiving chamber 180, allowing the damping fluid 140 to be squeezed from the damping chamber 150 to the receiving chamber 180. In some embodiments, to form a stable receiving chamber 180, one of the first component 110 and the second component 120 remains stationary relative to the second seal 190 and is provided with a groove section 121, while the other slides relative to the second seal 190 and maintains a seal. The groove section 121 is located between the first seal 130 and the second seal 190 and constitutes part of the cavity wall of the receiving chamber 180. Furthermore, in some specific examples, the tank section 121 includes spaced-apart support ribs 121B, with a tank formed between two adjacent support ribs 121B, and the support ribs 121B are provided with a through port 213 to connect the two adjacent tanks so that the damping liquid 140 can flow between the adjacent tanks.

[0099] Referring to Figures 1, 7, and 8, in some embodiments, the first component 110 is sleeved outside the second component 120, and the first seal 130 and the second seal 190 are elastic sealing rings spaced apart within an annular groove on the outer wall of the second component 120; the second seal 190 is located on the side of the first seal 130 away from the damping chamber 150, so that the first component 110, the second component 120, the first seal 130, and the second seal 190 cooperate to form a receiving chamber 180, and the first seal 130 forms the boundary area between the damping chamber 150 and the receiving chamber 180. Therefore, the first seal 130, in conjunction with the aforementioned clearance fit section 170, forms a channel for the damping fluid 140 to flow out, which can connect the damping chamber 150 and the receiving chamber 180. The first component 110 and the second component 120 form a sliding sealing structure through the second seal 190, which is configured to prevent the damping fluid 140 from passing through.

[0100] Furthermore, the second component 120 can drive the third seal 113 to move relative to the first component 110, and during this movement, the third seal 113 slides relative to the inner wall of the first component 110 and remains in a tight seal; at the same time, the second component 120 has a groove section 121 between the first seal 130 and the second component, and the groove section 121 constitutes part of the cavity wall of the receiving chamber 180. Specifically, the groove section 121 includes a centrally located central column 121A and support ribs 121B evenly distributed around the central column 121A. These support ribs 121B are used to improve the support strength of the groove section 121; at the same time, a groove for receiving damping fluid 140 is formed between two adjacent support ribs 121B. Correspondingly, the support ribs 121B also serve as baffle structures separating two adjacent grooves. In order to facilitate the flow of damping fluid 140 between adjacent grooves, a guide port 213 connecting the two adjacent grooves is also provided on the support ribs 121B. Referring to Figures 7 and 8, in a specific example, to facilitate the forming of the guide opening 213, the guide opening 213 is set as a notch at the edge of the support rib 121B radially away from the central column 121A. The number of guide openings 213 can be set to one or more as needed.

[0101] The following describes some embodiments of the relative rotation of the first component 110 and the second component 120.

[0102] Referring to Figures 9 to 12, in some embodiments, the second component 120 rotates relative to the first component 110 and moves from a first position to a third position via a second position.

[0103] Referring specifically to Figure 9, in some specific examples, the first component 110 is generally cylindrical and includes a receiving space with a bottom. The second component 120 is generally rod-shaped and extends into the receiving space of the first component 110. The central axes of the first component 110 and the second component 120 are collinear, and the second component 120 rotates relative to the first component 110 about its central axis. In some embodiments, the first component 110 includes a cylinder 111, a cover 112, and a third seal 113. One end of the cylinder 111 is covered by the cover 112 to form a receiving space with a bottom. The outer wall of the cylinder 111 covered by the cover 112 has an annular groove. The third seal 113 is an elastic sealing ring fitted within the annular groove, and the outer wall of the third seal 113 abuts against the inner wall of the cover 112, thereby forming a sealing structure between the cylinder 111 and the cover 112 through the third seal 113 to prevent the damping liquid 140 from flowing out. In some other embodiments, the cylinder wall and cylinder bottom of the first component 110 are integrally formed to create an accommodating space with a bottom.

[0104] Specifically, referring to Figures 9, 10, and 11, the second component 120 includes a circular rod-shaped body 122 and a flattened extension 123 at the end of the rod-shaped body 122. The extension 123 and part of the rod-shaped body 122 of the second component 120 extend into the accommodating space of the first component 110. Simultaneously, the extension 123 includes a rotating shaft 123A. Two partitions 114 are symmetrically arranged on the inner wall of the cylinder 111 of the first component 110. The two partitions 114 abut against the rotating shaft 123A of the extension 123 to form a sealed fit structure that prevents the damping fluid from passing through. The first sealing member 130 includes an annular portion 31 and a U-shaped portion 32. The annular portion 31 is fixedly embedded in the annular groove on the outer wall of the rod-shaped body 122 of the second component 120, and the U-shaped portion 32 is fixedly embedded in the U-shaped groove extending from the extension 123 of the second component 120. When the second component 120 and the first component 110 are assembled, the inner wall of the first component 110 and the rod-shaped body 122 of the second component 120 form a sealing fit structure through the annular portion 31 of the first seal 130. This sealing fit structure can prevent the damping liquid 140 from passing through.

[0105] Further, referring to FIG11, during the movement of the second component 120 from the first position to the second position, the inner wall of the first component 110 and the extension 123 of the second component 120 can form a sealed fit structure that prevents the damping liquid 140 from passing through through the U-shaped portion 32 of the first seal 130; at this time, the inner wall of the first component 110, the partition 114 of the first component 110, the rod-shaped body 122 of the second component 120, the extension 123 of the second component 120 and the first seal 130 form four chambers, two of which are gradually compressed as the second component 120 moves to serve as damping chambers 150 for accommodating the damping liquid 140 and filling fluid, and the other two chambers are gradually expanded as the second component 120 moves to serve as receiving chambers 180. During the movement of the second component 120 from the first position to the second position, the damping chamber 150 is gradually compressed while the receiving chamber 180 gradually expands, and the filling fluid in the damping chamber 150 is compressed or squeezed into the receiving chamber 180.

[0106] Referring to Figures 11 and 12, the inner wall of the first component 110 includes a sealing section 160 and a clearance section 170. The sealing section 160 abuts against the U-shaped portion 32 of the first sealing ring for sealing. The clearance section 170 forms a gap with the U-shaped portion 32 of the first seal by providing a groove on its side wall or by increasing its inner diameter compared to the sealing section 160, so that the damping chamber 150 and the receiving chamber 180 form a channel for the flow of damping fluid 140. Accordingly, during the movement of the second component 120 from the second position to the third position, the damping chamber 150 is gradually compressed while the receiving chamber 180 gradually expands. The damping fluid 140 in the damping chamber 150 is slowly squeezed into the receiving chamber 180, and the damping fluid 140 provides resistance to the rotation of the second component 120, delaying the time it takes for the second component 120 to rotate to the third position, thus achieving a delay function.

[0107] This application also discloses an injection device, which includes a pushing mechanism and the aforementioned delay mechanism. When the pushing action of the pushing mechanism is completed, it triggers relative movement between the first and second components in the delay mechanism. When the first component moves to a third position relative to the second component, the delay action ends and a prompt signal is given. The prompt signal can be a visual signal, an auditory signal, or a tactile signal, and the user can remove the needle from the injection site based on the prompt signal.

[0108] This application also discloses an injection device, which includes a pushing mechanism, a needle return mechanism, and the aforementioned delay mechanism. When the pushing action of the pushing mechanism is completed, it triggers the relative movement between the first component and the second component in the delay mechanism. When the first component moves to a third position relative to the second component, the delay action is completed and the automatic needle return action of the needle return mechanism is triggered, and the needle return mechanism pulls the needle out from the injection site.

[0109] Referring to Figures 13 to 20, the following embodiments of this application disclose a delay mechanism and an injection device employing the delay mechanism, which can prevent the damping liquid 230 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. In this embodiment, "first direction" refers to the direction in which the second component 220 moves from the first position to the second position relative to the first component 210, and "second direction" is opposite to "first direction".

[0110] Referring to Figures 13 to 15, the delay mechanism includes a first component 210, a second component 220, a damping fluid 230, and a first seal 240. The first component 210 and the second component 220 are sleeved together. Before the delay mechanism is activated, the second component 220 is in a first position relative to the first component 210. After the delay mechanism is activated, the second component 220 can move from the first position to a second position relative to the first component 210 along a first direction. Furthermore, when the delay action of the delay mechanism is completed, the second component 220 is in the second position relative to the first component 210.

[0111] Specifically, referring to FIG13, when the second component 220 is in the first position, the first component 210 and the second component 220 cooperate to form a damping chamber for containing damping liquid 230, and the damping chamber is connected to an outflow channel 250 for the damping liquid 230 to flow out; at the same time, the first seal 240 is in the outflow channel 250 and is used to seal the outflow channel 250 to prevent the damping process from flowing out of the damping chamber through the outflow channel 250. Referring to Figures 14 and 15, when the second component 220 moves from the first position to the second position, the first seal 240 is disengaged from the state of sealing the outflow channel 250 by the force of the damping liquid 230 in the outflow channel 250, so as to allow the damping liquid 230 to flow out from the damping chamber through the outflow channel 250; and, during the movement of the second component 220 from the first position to the second position, the moving second component 220 compresses the internal space of the damping chamber, so that the damping liquid 230 in the damping chamber flows out through the outflow channel 250, and the movement of the damping liquid 230 from the damping chamber provides resistance to the movement of the second component 220 relative to the first component 210, thus playing a delay function.

[0112] Using the above scheme, before the delay mechanism is activated, the outflow channel 250 connected to the damping chamber is sealed by the first seal 240. This effectively prevents the damping liquid 230 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 220 moves from the first position to the second position relative to the first component 210 to compress the damping chamber. The damping liquid 230 in the damping chamber exerts a force on the first seal 240 sealing the outflow channel 250, causing the first seal 240 to shift or deform and disengage from the sealed outflow channel 250. Then, the damping liquid 230 is squeezed out of the damping chamber as the second component 220 moves to the second position. During the process of the damping liquid 230 being squeezed out, it provides resistance to the movement of the first component 210, delaying the time it takes for the first component 210 to move to the second position, thereby realizing the delay function of the delay mechanism.

[0113] It is understood that the insertion of the first component 210 and the second component 220 indicates that there is an insertion relationship between the two components; wherein, the first component 210 may be inserted outside the second component 220, or the second component 220 may be inserted outside the first component 210. Correspondingly, the ability of the second component 220 to move relative to the first component 210 means that a change in relative position can occur between the two components; wherein, the first component 210 may be stationary while the second component 220 is moving to form relative motion, or the second component 220 may be stationary while the first component 210 is moving to form relative motion, or the first component 210 and the second component 220 may move simultaneously but with one of their speeds or directions of motion being different to form relative motion.

[0114] It should be noted that both the first position and the second position refer to the relative positions of the second component 220 and the first component 210. In the foregoing, the second component 220 being in the first position means that the second component 220 is in a first position relative to the first component 210. Furthermore, the foregoing description does not limit the specific form of movement of the second component 220 relative to the first component 210. That is, in some specific examples, the second component 220 can move from the first position to the second position by translation relative to the first component 210; in other specific examples, the second component 220 can move from the first position to the second position by rotation relative to the first component 210.

[0115] It should also be noted that the damping fluid 230 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 230; in some more specific examples, the damping fluid 230 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 230.

[0116] Referring to Figure 13, in some embodiments, both the first component 210 and the second component 220 are generally rod-shaped structures. The first component 210 has a cylindrical inner cavity with a bottom, and the second component 220 extends into the cylindrical inner cavity of the first component 210. The end of the second component 220 near the bottom of the cylindrical inner cavity mates with the interior of the first component 210 to form a damping chamber that can accommodate the damping fluid 230. Simultaneously, the second component 220 can move within the cylindrical inner cavity along a first direction near the bottom of the cylindrical inner cavity to compress the damping chamber. Furthermore, the first direction is parallel to the axial direction of the first component 210 and the second component 220.

[0117] Referring to Figures 13 and 16, in some embodiments, the second component 220 includes a first mating section 221 and a second mating section 222 located within the first component 210, the first mating section 221 and the second mating section 222 being arranged along a second direction opposite to the first direction; wherein, the first mating section 221 and the first component 210 have a gap in a direction perpendicular to the first direction, thereby forming an outflow channel 250. The first sealing member 240 is annular and sleeved on the outer wall of the first mating section 221, while the first sealing member 240 abuts against the inner wall of the first component 210 to seal the outflow channel 250. The second mating section 222 and the first component 210 are spaced apart in a direction perpendicular to the first direction to form a receiving space 260. The spacing for forming the receiving space 260 is greater than the maximum gap that the first seal 240 can seal. Therefore, when the second component 220 moves from the first position to the second position along the first direction, the first seal 240 will be disengaged from the first mating section 221 by the force of the damping liquid 230 in the outflow channel 250 and be received by the receiving space 260. In this case, the first seal 240 loses its sealing effect on the outflow channel 250, so that when the second component 220 continues to move to the second position and compresses the damping chamber, the damping liquid 230 in the damping chamber can flow to the receiving space 260 through the outflow channel 250.

[0118] Furthermore, referring to Figures 16 and 17, in some specific examples, the first mating section 221 is also provided with a positioning groove 221A for positioning the first seal 240, which facilitates the stable installation of the first seal 240; at the same time, the positioning groove 221A has a first groove wall 221B and a second groove wall 221C opposite to each other along a first direction, wherein the first groove wall 221B is closer to the second mating section 222 than the second groove wall 221C, and the first groove wall 221B is configured to be inclined toward the direction of the second mating section 222, which facilitates the first seal 240 to disengage from the positioning groove 221A under the force of the damping liquid 230.

[0119] Additionally, referring to Figures 16 and 17, in some specific examples, the first mating section 221 is further provided with a plurality of connecting grooves 221D extending from the second groove wall 221C to the end of the first mating section 221. The plurality of connecting grooves 221D are evenly arranged circumferentially to allow the damping liquid 230 to pass through. At the same time, the position and width of the connecting grooves 221D are configured such that the damping liquid 230 passing through the connecting grooves 221D can at least impact the lower half of the first seal 240 near the first mating section 221, so that when the second component 220 moves from the first position to the second position, the first seal 240 can more easily disengage from the positioning groove 221A of the first mating section 221.

[0120] Referring again to Figures 13 and 17, to prevent the damping fluid 230 within the containment space 260 from flowing out to other areas, in some embodiments, the second component 220 further includes a third mating section 223 located within the first component 210 and forming a sliding seal with the first component 210. Specifically, the third mating section 223 is located on the side of the second mating section 222 opposite to the first mating section 221, that is, the first mating section 221, the second mating section 222, and the third mating section 223 are arranged sequentially along a second direction opposite to the first direction. Meanwhile, the delay mechanism includes a second seal 270 disposed between the third mating section 223 and the first component 210; during the movement of the second component 220 relative to the first component 210 from a first position to a second position, one of the third mating section 223 and the first component 210 remains stationary with respect to the second seal 270, while the other slides relative to the second seal 270 and maintains a seal. In some specific examples, the second seal 270 is a sealing ring fixedly sleeved on the third mating section 223 of the second component 220, and the outer periphery of the second seal 270 abuts against the inner wall of the first component 210; while in other examples, the second seal 270 can be configured as a sealing ring fixedly embedded inside the first component 210, and the inner periphery of the second seal 270 abuts against the outer wall of the third mating section 223 of the second component 220.

[0121] It is understandable that the second mating section 222 needs to serve as a connecting section between the first mating section 221 and the third mating section 223, and also needs to cooperate with the first component 210 to form a sufficient accommodating space 260 for accommodating the damping liquid 230. This requires the second mating section 222 to have sufficient groove space and sufficient support force. Accordingly, referring to Figures 16 and 17, in some embodiments, the second mating section 222 includes a central column 222A arranged parallel to the first direction and a plurality of support ribs 222B arranged circumferentially around the central column 222A, with a groove space formed between each adjacent support rib 222B.

[0122] It is understood that the aforementioned first component 210 can be a single component or an assembly of multiple components. Specifically, referring to FIG18, in some embodiments, the first component 210 is configured as a cylindrical component with one end open and the other end closed; in this embodiment, the inner cavity of the cylindrical component serves as the cylindrical inner cavity of the first component 210, and the closed end of the cylindrical component serves as the bottom of the cylindrical inner cavity. Referring to FIG19, in other embodiments, the first component 210 is configured as a cylindrical assembly formed by assembling multiple components; it specifically includes a cylindrical body 211, a cover 212, and a third sealing member 213, wherein the cylindrical body 211 is open at both ends, and one end of the opening is closed by the cover 212; at the same time, the cylindrical body 211 and the cover 212 form a sealing structure that prevents the damping liquid 230 from flowing out through the third sealing member 213; in this embodiment, the inner cavity of the cylindrical body 211 serves as the cylindrical inner cavity of the first component 210, and the cover 212 serves as the bottom of the cylindrical inner cavity.

[0123] Furthermore, in embodiments where the first component 210 includes a cylinder 211 and a cover 212, a corresponding engaging structure is provided between the cylinder 211 and the cover 212; that is, one of the cylinder 211 and the cover 212 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. Referring to FIG19, in some specific examples, the locking slot is configured as a through hole 212A on the side wall of the cover 212, and the locking block is configured as a protrusion 211A protruding from the outer wall of the cylinder 211.

[0124] Furthermore, in some embodiments, to maintain smooth movement of the second component 220 relative to the first component 210 in the first direction, a guide structure is provided between the first component 210 and the second component 220; specifically, one of the first component 210 and the second component 220 is provided with a guide groove 214 parallel to the first direction, and the other is provided with a guide portion embedded in the guide groove 214. Referring to FIG20, in some specific examples, the guide groove 214 is formed in the side wall of the first component 210, and the guide portion is configured as a guide latch 224 protruding from the side wall of the second component 220. The guide latch 224 can slide in the guide groove 214 to guide smooth movement between the second component 220 and the first component 210.

[0125] This application also discloses an injection device, which includes the aforementioned delay mechanism, to ensure the accuracy of the delay function of the injection device.

[0126] In some examples, the injection device includes a delivery mechanism and the aforementioned delay mechanism. The delivery mechanism delivers the medication, and when the delivery mechanism completes its delivery action, it triggers relative movement between the first component 210 and the second component 220 in the delay mechanism. When the second component 220 moves to a second position relative to the first component 210, the delay action is completed and a prompt signal is given. The prompt signal can be a visual, auditory, or tactile signal, which allows the user to withdraw the needle from the injection site.

[0127] 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, and 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 210 and the second component 220 in the delay mechanism; when the second component 220 moves to a second position relative to the first component 210, 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.

[0128] 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 comprising a first component, a second component, and a damping fluid, wherein the first component and the second component are sleeved together, and a damping chamber for containing the damping fluid is formed between them, and the second component is movable relative to the first component, characterized in that, Before the delay mechanism is triggered, the damping chamber is in a sealed state that restricts the outflow of the damping fluid; After the delay mechanism is triggered, the first component and the second component move relative to each other to compress the damping chamber and form a channel for the damping fluid to flow out of the damping chamber.

2. The delay mechanism according to claim 1, characterized in that, The delay mechanism also includes a first seal and a filling fluid; The second component is movable relative to the first component from a first position to a third position via a second position; when the second component is in the first position, the first component, the second component, and the first seal cooperate to form a damping chamber that prevents the damping fluid from flowing out, and the damping fluid and the filling fluid are contained in the damping chamber; During the movement of the second component from the first position to the second position, the first component and the second component cooperate through the first seal to form a sliding seal structure that prevents the damping fluid from passing through, the damping chamber is compressed and the filling fluid is compressed and / or discharged; During the movement of the second component from the second position to the third position, the damping chamber is connected to a channel for the damping fluid to flow out, the damping chamber is compressed and the damping fluid is squeezed out of the damping chamber.

3. The delay mechanism according to claim 2, characterized in that, The first seal is located between the first component and the second component, and one of the first component and the second component remains stationary relative to the first seal, while the other component includes a sealing fit section and a clearance fit section; During the movement of the second component from the first position to the second position, the first seal engages with the sealing mating section so that the first component and the second component form the sliding sealing structure through the first seal; During the movement of the second component from the second position to the third position, the first seal engages with the clearance fit section to create a gap between the first seal, the first component, and the second component, thereby forming a channel for the damping fluid to flow out of the damping chamber.

4. The delay mechanism according to claim 3, characterized in that, The surface of the clearance fit section is provided with a flow guide groove, and the bottom of the flow guide groove has a gap with the first sealing element to form a channel for the damping liquid to flow out from the damping chamber.

5. The delay mechanism according to claim 4, characterized in that, The first component is sleeved on the outside of the second component, the outer wall of the second component is provided with an annular groove, and the first sealing element is fixedly sleeved in the annular groove on the outer wall of the second component so that the first sealing element and the second component remain relatively stationary; The inner wall of the first component includes the sealing section and the clearance section distributed along the translational direction of the second component. The first component abuts against the first sealing element on the inner wall of the sealing section and can slide relative to it to realize a sliding sealing structure between the first component and the second component at the first sealing element. The first component has a gap between the inner wall of the gap fit section and the first seal, forming a channel for the damping liquid to flow out.

6. The delay mechanism according to claim 5, characterized in that, The second component has a guide groove extending in the translational direction on the outer wall of the clearance fit section. The bottom of the guide groove has a gap with the first seal to form a channel for the damping liquid to flow out.

7. The delay mechanism according to claim 3, characterized in that, The first component is sleeved on the outside of the second component, and the inner diameter of the clearance fit section of the first component is larger than the inner diameter of the sealing fit section.

8. The delay mechanism according to claim 2, characterized in that, The delay mechanism further includes a receiving chamber, during which the second component moves from the second position to the third position, the channel through which the damping fluid flows out of the damping chamber is connected to the receiving chamber, and the damping fluid can be squeezed and flow from the damping chamber to the receiving chamber.

9. The delay mechanism according to claim 8, characterized in that, The delay mechanism further includes a second seal, and the first component, the second component, the first seal, and the second seal cooperate to form the receiving chamber; One of the first component and the second component remains stationary relative to the second seal and has a groove section, while the other component slides relative to the second seal and maintains a seal. The groove section is located between the first seal and the second seal and constitutes part of the cavity wall of the receiving chamber.

10. The delay mechanism according to claim 9, characterized in that, The groove segment includes spaced-apart support ribs, a groove is formed between two adjacent support ribs, and the support ribs are provided with a through port for connecting the two adjacent grooves.

11. The delay mechanism according to claim 10, characterized in that, The groove section includes a centrally located central column, the supporting ribs are evenly distributed around the central column, and the guide opening is configured as a radially spaced edge recess on the supporting rib away from the central column.

12. The delay mechanism according to claim 9, characterized in that, The first component is sleeved on the outside of the second component, and the outer wall of the second component is provided with an annular groove. The first seal and the second seal are elastic sealing rings that are spaced apart and sleeved in the annular groove of the outer wall of the second component.

13. The delay mechanism according to claim 12, characterized in that, The second seal is located on the side of the first seal away from the damping chamber, and the first component, the second component, the first seal, and the second seal cooperate to form the receiving chamber; The first seal forms the boundary area between the damping chamber and the receiving chamber, and the first seal and the clearance fit section cooperate to form a channel for the damping fluid to flow out, connecting the damping chamber and the receiving chamber.

14. The delay mechanism according to claim 2, characterized in that, The first component includes a receiving space with a bottom, and one end of the second component extends into the receiving space, with the end of the second component extending into the receiving space and the bottom of the receiving space respectively forming part of the cavity wall of the damping chamber.

15. The delay mechanism according to claim 14, characterized in that, The first component includes a cylinder, a cover, and a third seal. One end of the cylinder is covered by the cover to form the receiving space with a bottom. The cylinder and the cover form a sealing structure that prevents the damping liquid from flowing out through the third seal.

16. The delay mechanism according to claim 15, characterized in that, The outer wall of the cylinder body, which is covered by the cover body, is provided with an annular groove. The third sealing element is an elastic sealing ring fitted in the annular groove, and the outer wall of the third sealing element abuts against the inner wall of the cover body.

17. The delay mechanism according to claim 14, characterized in that, The first component includes an integrally formed cylindrical wall and a cylindrical bottom, forming the accommodating space having a bottom.

18. The delay mechanism according to claim 2, characterized in that, The first component translates relative to the second component and moves from the first position to the third position via the second position; or, the first component rotates relative to the second component and moves from the first position to the third position via the second position.

19. The delay mechanism according to claim 18, characterized in that, The first component is cylindrical and includes a receiving space with a bottom; the second component is rod-shaped and extends into the receiving space of the first component. The central axes of the first component and the second component are collinear, and the second component rotates relative to the first component about its central axis.

20. The delay mechanism according to claim 1, characterized in that, The delay mechanism also includes a first seal; 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.

21. The delay mechanism according to claim 20, characterized in that, The second component includes a first mating section and a second mating section located within the first component; The outflow channel is formed between the first mating section and 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.

22. The delay mechanism according to claim 21, 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.

23. The delay mechanism according to claim 22, 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.

24. The delay mechanism according to claim 21, characterized in that, The second component further includes a third mating section located 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.

25. The delay mechanism according to claim 21, 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.

26. The delay mechanism according to claim 21, 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.

27. The delay mechanism according to claim 20, 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.

28. The delay mechanism according to claim 27, 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.

29. An injection device, characterized in that, It includes a pushing mechanism and a delay mechanism as described in any one of claims 1 to 28, 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.

30. The injection device according to claim 29 of claims 2 to 19, characterized in that, A prompt signal is given when the first component moves to the third position relative to the second component; or When the first component moves to the third position relative to the second component, a return needle action is triggered. or When the first component moves to the third position relative to the second component, a prompt signal is given and a return needle action is triggered.

31. The injection device according to claim 29 of claims 20 to 28, characterized in that, A prompt signal is given when the first component moves to the second position relative to the second component; or a return motion is triggered when the first component moves to the second position relative to the second component.

Images