Injection delay mechanism and injection device

Abstract

The invention relates to an injection delay assembly and an injection device. The injection delay assembly comprises a driving part, a delay part and a power part. The driving part is used for moving in a first direction to push and inject medicine; the time delay part comprises a time delay moving part and a time delay fixed part, the time delay moving part can move from an initial static position to a time delay ending position relative to the time delay fixed part, the axial movement of the time delay moving part relative to the time delay fixed part at the initial static position is limited, and the time delay moving part triggers and / or prompts needle return at the time delay ending position; the power part is arranged in the driving part and is used for driving the driving part to move to a second position from a first position to a first direction relative to the delay moving part; when the driving part is located at the second position, the axial movement limitation of the delay movement part is relieved, and the power part drives the delay movement part to move in the second direction to the delay ending position. According to the injection device, the needle returning time can be delayed after liquid medicine is injected, so that the liquid medicine is further emptied, and the structure of the injection device can be simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to an injection delay mechanism and an injection device. Background Art

[0002] The injection device can inject the medicine contained therein into the user's body through a needle from the user's injection site. It usually includes a shell, a medicine bottle, and an injection mechanism, wherein the medicine bottle is installed in the shell, and the medicine bottle includes a bottle body, a medicine placed in the bottle body, a needle at the far end of the bottle body and a movable piston at the proximal end of the bottle body. The injection mechanism is used for the user to operate to push the medicine liquid in the medicine bottle into the human body.

[0003] During the actual injection, the injected drug usually takes some time to be completely discharged from the medicine bottle, and the drug also takes some time to disperse at the injection site. If the needle of the injection device is pulled out from the injection site immediately after the injection is completed, the drug may not be completely discharged from the medicine bottle, and / or the drug may flow out from the injection site, which will cause a part of the drug to not be completely injected into the user's body. The instructions for use of some injection devices will prompt the user to wait for a few seconds after the injection is completed before pulling out the needle, so that the needle can stay at the injection site for a period of time; but the time to pull out the needle depends on the user, which is not convenient for the user. Summary of the invention

[0004] The existing injection devices cannot ensure that the injected medicine is completely discharged because the time for pulling out the needle depends on the user, or cannot ensure that the medicine is dispersed at the injection site and flows out from the injection site. Therefore, one of the purposes of the present invention is to propose an injection delay mechanism for discharging the remaining medicine and ensuring that the medicine can be completely injected into the user's body.

[0005] The second object of the present application is to provide an injection device, which includes the injection delay mechanism provided by one of the above objects, which is used to discharge the remaining medicine to ensure that the medicine can be completely injected into the user's body, and the injection device automatically triggers the needle back after the delay is completed, which can improve the user's operating experience.

[0006] One of the purposes of the present application is to provide an injection delay component that adopts the following technical solution: an injection delay component, including a driving member, a delay member, and a power member;

[0007] The driving member is used to move in a first direction to push the medicine;

[0008] The delay element comprises a delay moving element and a delay fixing element. The delay moving element can move from an initial static position to a delay termination position relative to the delay fixing element. The axial movement of the delay moving element relative to the delay fixing element is restricted when the delay moving element is at the initial static position. The delay moving element triggers and / or prompts needle return when the delay termination position is reached.

[0009] A power member disposed inside the driving member is used to drive the driving member to move from a first position to a second position in a first direction relative to the delay moving member; when the driving member is located at the second position, the axial movement restriction of the delay fixing member is released, and the power member drives the delay moving member to move in the second direction to the delay termination position.

[0010] The direction pointing to the drug ejection end is defined as the first direction, wherein the first direction is consistent with the injection direction of the injection device, and the second direction is opposite to the first direction. With the user as a reference, the end close to the injection device operation site of the human body is defined as the proximal end, and the end close to the injection site of the human body (i.e., the drug ejection end) is defined as the distal end, that is, the end away from the drug ejection end of the injection device is the proximal end, and the end close to the drug ejection end of the injection device is the distal end.

[0011] By adopting the above technical solution, after the driving member is driven by the power member to push the medicine in the first direction, it does not immediately trigger the needle return or prompt the user to manually return the needle. Instead, the power member drives the delay member in the second direction to perform a delay operation; during the delay period, the distal end of the power member continues to push the driving member to squeeze the piston in the medicine bottle to discharge the remaining medicine, while allowing the medicine to be fully diffused at the injection site of the user.

[0012] Furthermore, one of the delay moving part and the delay fixing part is provided with a first limiting portion that can be radially displaced, and the other is provided with a first limiting groove; when the first limiting portion is inserted into the first limiting groove, the axial movement of the delay moving part is restricted; when the first limiting portion is moved out of the first limiting groove, the axial movement restriction of the delay moving part is released.

[0013] Further, at least part of the driving member is sleeved inside the time-delay moving member, and the time-delay fixing member is sleeved outside the time-delay moving member; the first limiting portion is arranged at the distal end of the time-delay moving member, the first limiting groove is arranged at the distal end of the time-delay fixing member, the outer peripheral surface of the driving member contacts the first limiting portion, and the first limiting portion is supported by the radial force of the driving member so as to be stuck in the first limiting groove to limit the axial movement of the time-delay moving member;

[0014] When the driving member is located at the second position, the driving member is separated from the time-delay moving member and the first limiting portion is no longer subjected to the radial force of the driving member, allowing the power member to drive the time-delay moving member to move axially.

[0015] By adopting the above technical solution, a delay can be automatically triggered after the push injection is completed.

[0016] Furthermore, the delay element further includes a damper disposed between the delay moving element and the delay fixing element, and the damper is used to slow down the speed of the delay moving element moving in the first direction.

[0017] Furthermore, the damper includes a damping chamber containing a damping fluid; when the delayed moving part moves from an initial static position to a second direction to a delay end position, the damping fluid in the damping chamber is squeezed out by the delayed motion to slow down the movement speed of the delayed moving part.

[0018] By adopting the above technical solution, the delay process can be made more stable and the delay time can be controlled.

[0019] Furthermore, the time-delay moving member or the driving member is provided with a positioning rod along the central axis, and the positioning rod extends axially and is used to support the power member.

[0020] By adopting the above technical solution, the force of the power part is always kept on the central axis, so that the driving force is more stable during the injection and delay process.

[0021] The second object of the present invention is to provide an injection device adopting the following technical solution:

[0022] An injection device, comprising a housing, a medicine bottle, a return needle assembly and the above-mentioned injection delay assembly; the return needle assembly comprises a medicine bottle support for accommodating the medicine bottle and a return needle spring for driving the medicine bottle support to move in a second direction, the medicine bottle support is fixedly connected to the delay fixing member and the axial movement relative to the housing is restricted before the return needle is triggered;

[0023] When the delay moving part moves to the delay termination position, the axial movement restriction of the medicine bottle support and the delay fixing part is released, and the medicine bottle support and the delay fixing part are driven by the return spring to move in the second direction.

[0024] By adopting the above technical solution, the injection device can trigger the needle return action after the delay mechanism is completed, providing convenience for the user of the injection device.

[0025] Furthermore, it includes a return needle trigger mechanism, which includes a return needle locking part arranged on the delay fixing part and a return needle trigger part arranged on the delay moving part, and the shell includes a stop part; the return needle locking part and the stop part jointly limit the axial movement of the delay fixing part relative to the shell, and the return needle trigger part is used to release the axial movement restriction of the delay fixing part when the delay moving part moves to the delay end position.

[0026] Furthermore, the delayed moving part includes a first section located at its proximal end and a second section located at the distal end of the first section, the return needle triggering part includes a return needle unlocking groove arranged on the second section of the delay moving part, and the return needle locking part includes a radially deformable return needle unlocking protrusion arranged on the delay fixing part; before the delayed moving part moves to the delay termination position, the outer side of the return needle unlocking protrusion abuts against the inclined surface of the stop part, and the inner side of the return needle unlocking protrusion abuts against the first section of the delay moving part and locks the axial position of the return needle unlocking protrusion, thereby limiting the axial movement of the delay fixing part; when the delay moving part moves to the delay termination position, the return needle unlocking groove moves to the inner side of the return needle unlocking protrusion, so that the return needle unlocking protrusion retracts radially inward into the return needle unlocking groove under the action of the return needle spring, thereby releasing the axial movement restriction of the delay fixing part.

[0027] Furthermore, the return needle locking portion includes a radially deformable return needle unlocking hook arranged on the delay fixing piece and a return needle unlocking slot radially accommodating the return needle unlocking hook, and the return needle triggering portion includes a return needle unlocking push arm arranged on the delay moving piece and extending in the second direction; before the delay moving piece moves to the delay end position, the return needle unlocking hook directly abuts against the stop portion to limit the axial movement of the delay fixing piece; when the delay moving piece moves to the delay end position, the return needle unlocking push arm abuts against the return needle unlocking hook and radially retracts the return needle unlocking hook into the return needle unlocking slot to release the axial movement restriction of the delay fixing piece.

[0028] By adopting the above technical solution, the needle return is automatically triggered when the delay ends.

[0029] Furthermore, it includes a trigger assembly located outside the injection delay assembly, and the trigger assembly includes a trigger member extending outside the distal end of the shell and axially movable relative to the shell; the drive member moves in a first direction relative to the shell in a first position and is braked by the delay member, and the trigger member can move in a second direction to a trigger position to release the initial braking state of the drive member, so that the drive member moves in the first direction under the drive of the power member to inject the drug.

[0030] In summary, the present application has at least one of the following beneficial effects:

[0031] 1. Prolong the drug retention time after injection, and continue to discharge the remaining drug during the delay period;

[0032] 2. The driving force for delay and injection is provided by the power parts, and the structure is simple;

[0033] 3. The delay element is arranged at the proximal end of the housing, which can simplify the structure of the injection device, reduce the weight of the entire device, and facilitate the user's operation;

[0034] 4. The linkage between triggering, injection, delay and needle return is strong, which can improve the user's operating experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0036] Figure 1 It is a structural schematic diagram of an injection delay mechanism according to an embodiment of the present invention;

[0037] Figure 2 It is a schematic cross-sectional structural diagram of an injection device in which a driving member is located at a first position according to an embodiment of the present invention;

[0038] Figure 3 A schematic cross-sectional view of an injection device when the delayed moving part is located at an initial static position according to an embodiment of the present invention Figure 1 ;

[0039] Figure 4 It is a schematic cross-sectional structural diagram of an injection device when the time-delay moving part is located at the time-delay end position according to an embodiment of the present invention;

[0040] Figure 5 A schematic structural diagram of an injection device according to an embodiment of the present invention;

[0041] Figure 6 A schematic diagram of the structure of a time-delay moving part according to an embodiment of the present invention;

[0042] Figure 7 A schematic diagram of the structure of a time-delay fixing member according to an embodiment of the present invention Figure 1 ;

[0043] Figure 8 A schematic diagram of the structure of a time-delay fixing member according to an embodiment of the present invention Figure 2 ;

[0044] Fig. 9 This is a schematic structural diagram of a medicine bottle support according to an embodiment of the present invention;

[0045] Fig.10 A schematic diagram of the cross-sectional structure of an injection device after needle return in one embodiment of the present invention Figure 1 ;

[0046] Fig.11 A schematic cross-sectional view of an injection device when the delayed moving part is located at an initial static position according to an embodiment of the present invention Figure 2 ;

[0047] Fig.12 A schematic cross-sectional view of an injection device when the delay moving part is located at the delay end position according to an embodiment of the present invention Figure 2 ;

[0048] Fig.13 A schematic diagram of the cross-sectional structure of an injection device after needle return in one embodiment of the present invention Figure 2 ;

[0049] Fig.14 It is a schematic cross-sectional structural diagram of an injection device in which a driving member is located at a first position according to an embodiment of the present invention;

[0050] Fig.15 This is a schematic cross-sectional structural diagram of an injection device with a driving member located at a second position according to an embodiment of the present invention.

[0051] Description of reference numerals: 1, driving member; 11, second limiting groove; 21, time-delay moving member; 211, positioning rod; 212, first limiting portion; 213, return pin unlocking groove; 214, return pin unlocking push arm; 2141, second inclined surface; 215, first section; 216, second section; 217, second limiting portion; 22, time-delay fixing member; 221, first limiting groove; 222, inclined surface buckle; 223 , end cover; 224, return needle unlocking protrusion; 225, return needle unlocking hook; 2251, first straight surface; 2252, first inclined surface; 226, return needle unlocking slot; 23, damper; 3, power member; 4, medicine bottle support; 41, inclined slot; 5, return needle spring; 6, trigger member; 61, protruding inner wall; 7, medicine bottle; 8, piston; 9, shell; 91, stopper; 911, second straight surface. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0054] In the description of the present invention, the direction pointing to the drug ejection end is the first direction, wherein the first direction is consistent with the injection direction of the injection device, and the second direction is opposite to the first direction. With the user as a reference, the end close to the human body operating injection device is defined as the proximal end, and the end close to the human body injection site (i.e., the drug ejection end) is the distal end, that is, the end away from the drug ejection end of the injection device is the proximal end, and the end close to the drug ejection end of the injection device is the distal end.

[0055] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The injection device can inject the medicine contained therein into the user's body through a needle from the user's injection site. It usually includes a shell, a medicine bottle, and an injection mechanism, wherein the medicine bottle is installed in the shell, and the medicine bottle includes a bottle body, a medicine placed in the bottle body, a needle at the far end of the bottle body and a movable piston at the proximal end of the bottle body. The injection mechanism is used for the user to operate to push the medicine liquid in the medicine bottle into the human body.

[0057] During the actual injection, the injected drug usually takes some time to be completely discharged from the medicine bottle, and the drug also takes some time to disperse at the injection site. If the needle of the injection device is pulled out from the injection site immediately after the injection is completed, the drug may not be completely discharged from the medicine bottle, and / or the drug may flow out from the injection site, which will cause a part of the drug to not be completely injected into the user's body. The instructions for use of some injection devices will prompt the user to wait for a few seconds after the injection is completed before pulling out the needle, so that the needle can stay at the injection site for a period of time; but the time to pull out the needle depends on the user, which is not convenient for the user.

[0058] For this reason, some injection devices are equipped with a delay mechanism for automatically delaying the needle's residence time. In the related art, some injection devices arrange the damper for delay at the far end of the shell, such as inside the medicine bottle. After injection, the delay mechanism can be driven by a power spring to squeeze the damper in the medicine bottle. However, according to relevant standards, the radial dimension of the medicine bottle cannot be increased. Arranging the damper in the medicine bottle will cause the injection device to become longer in the axial direction as a whole, making it difficult for the user to operate. Some injection devices do not arrange the delay mechanism in the medicine bottle, and a power spring is required to provide driving force. The power spring is different from the spring for driving the push injection, resulting in a large number of components of the injection device and a complex structure.

[0059] To this end, an embodiment of the present application discloses an injection delay mechanism, in which the driving force of the delay mechanism and the driving member for pushing the drug originate from the same power member. During the delay period, the distal end of the power member continues to push the driving member to squeeze the piston in the medicine bottle, so that the power member drives the piston to expel the remaining drug while driving the delay. Setting the delay mechanism at the proximal end of the shell can also simplify the structure of the injection device and reduce the weight of the overall device.

[0060] Reference Figure 1 The injection delay mechanism includes a driving member 1, a delay member, and a power member 3. The delay member includes a delay moving member 21 and a delay fixing member 22. Figure 2 , the distal end of the driving member 1 abuts against the movable piston 8 in the medicine bottle 7. Under the action of external force, the driving member 1 can drive the piston 8 to move in the first direction to push the medicine in the medicine bottle 7; before starting the delay, the delay moving member 21 is located in the initial static position, and the axial movement of the delay moving member 21 relative to the delay fixing member 22 is restricted in the initial static position; refer to Figure 3 , Figure 4 After the delay is started, the delay moving part 21 can move from the initial static position to the delay termination position relative to the delay fixing part 22, and the delay moving part 21 triggers and / or prompts the needle to return at the delay termination position.

[0061] Reference Figures 2 to 4The power member 3 is arranged inside the driving member 1, and is used to drive the driving member 1 to move from the first position to the second position in the first direction relative to the delay moving member 21; when the driving member 1 is in the first position, the injection is not started, and the axial movement of the delay moving member 21 is restricted; when the driving member 1 is in the second position, the axial movement restriction of the delay moving member 21 is released, and the power member 3 drives the delay moving member 21 to move in the second direction to the delay end position.

[0062] In this embodiment, the driving member 1, the delay moving member 21, and the delay fixing member 22 are preferably a cylinder with a channel inside, and the power member 3 is preferably a compression spring; the proximal opening of the driving member 1 is used to place the power member 3, and the distal end is closed. The distal end of the power member 3 abuts the driving member 1, which is used to push the driving member 1 to move in the first direction until the injection ends. The proximal end of the power member 3 abuts the delay moving member 21. After the delay is started, the proximal end of the power member 3 can push the delay moving member 21 from the initial static position to the second direction to the delay end position. At the same time, during the delay period, the distal end of the power member 3 will continue to push the driving member 1 to squeeze the piston 8 to continue to discharge the drug. In some specific examples, the driving member 1 in the second position relative to the delay moving member 21 is configured to be adjacent to the driving member 1 pushing the piston 8 to move to implement the push injection end position, and during the delay period, the driving member 1 will continue to move from the second position to the push injection end position, thereby squeezing the piston 8 and causing the piston 8 to move in the first direction; in other specific examples, the driving member 1 in the second position relative to the delay moving member 21 is configured that the driving member 1 has pushed the piston 8 to the push injection end position for implementing the push injection, and during the delay period, the driving member 1 maintains a state of squeezing the piston 8.

[0063] It can be understood that if the injection device used in the injection delay mechanism is automatically triggered and automatically returns the needle, then when the delay moving part 21 moves to the delay termination position, the return of the needle can be automatically triggered, that is, after the delay ends, the medicine bottle in the injection device using the injection delay mechanism is configured to move in the second direction so that the needle is moved out of the injection site of the user; in addition, when the return of the needle is triggered, feedback can also be generated to prompt the end of the delay or the start of the return of the needle. This feedback can be a certain visual effect or a sound feedback, which is used to remind the user that the injection process has ended and the needle is about to be removed; if the injection device used in the injection delay mechanism is manually triggered and manually returns the needle, then when the delay moving part 21 moves to the delay termination position, feedback can be generated to prompt the end of the delay or the start of the return of the needle. This feedback can be a certain visual effect or a sound feedback, which is used to prompt the user to manually remove the injection device at this time, thereby removing the needle from the injection site.

[0064] By adopting the above technical solution, after the driving member 1 is driven by the power member 3 to push the medicine in the first direction, it does not immediately trigger the needle return or prompt the user to manually return the needle. Instead, the power member 3 drives the delay member in the second direction to perform a delay operation; during the delay period, the distal end of the power member 3 continues to push the driving member 1 to squeeze the piston 8 in the medicine bottle 7 to discharge the remaining medicine, while allowing the medicine to be fully diffused at the injection site of the user.

[0065] Further, refer to Figures 2 to 3 , Figures 6 to 8 One of the delay moving part 21 and the delay fixing part 22 is provided with a first limiting portion 212 that can be radially displaced, and the other is provided with a first limiting groove 221; Figure 2 When the first limiting portion 212 is inserted into the first limiting groove 221, the axial movement of the delay moving member 21 is restricted; Figure 3 The first limiting portion 212 can be moved out of the first limiting groove 221 to release the axial movement restriction of the delay moving part 21.

[0066] In this embodiment, the delay moving part 21 is sleeved with the delay fixing part 22 . Specifically, the delay moving part 21 may be sleeved on the outside of the delay fixing part 22 , or the delay fixing part 22 may be sleeved on the outside of the delay moving part 21 .

[0067] Further, refer to Figures 1 to 3 , further, at least part of the driving member 1 is sleeved inside the time-delay moving member 21, and the time-delay fixing member 22 is sleeved outside the time-delay moving member 21; the first limiting portion 212 is arranged at the distal end of the time-delay moving member 21, and the first limiting groove 221 is arranged at the distal end of the time-delay fixing member 22, and the outer peripheral surface of the driving member 1 contacts the first limiting portion 212, and the first limiting portion 212 is supported by the radial force of the driving member 1 and thus snaps into the first limiting groove 221 to limit the axial movement of the time-delay moving member 21; when the driving member 1 is in the second position, the distal end of the driving member 1 is separated from the time-delay moving member 21 and the first limiting portion 212 is no longer subjected to the radial force of the driving member 1, allowing the power member 3 to drive the time-delay moving member 21 to move axially. By adopting the above technical solution, the delay can be automatically triggered after the injection is completed.

[0068] Further, refer to Figure 2 , Figure 3The first limiting portion 212 is arranged at the distal end of the delay moving part 21, and the first limiting groove 221 is arranged at the distal end of the delay fixing part 22. The outer peripheral surface of the driving member 1 contacts the first limiting portion 212, and the limiting portion is supported by the radial force of the driving member 1 and is thus inserted into the first limiting groove 221, so that the movement of the delay moving part 21 in the second direction is restricted by the delay fixing part 22, thereby keeping the delay moving part 21 in a limited state; when the driving member 1 pushes the piston 8 to the bottom of the medicine bottle 7, the driving member 1 disengages from the delay moving part 21, and the first limiting portion 212 is no longer subject to the radial force of the driving member 1, allowing the power member 3 to drive the delay moving part 21 to move axially. At this time, the distal end of the driving member 1 pushes the piston 8 to the bottom of the medicine bottle 7.

[0069] In this embodiment, the first limiting portion 212 may be a first elastic arm having a first stop buckle. When the time-delay moving part 21 is kept in the limiting state, the first stop buckle is subjected to the radial force of the driving member 1 so as to be radially opened outward and locked in the first limiting groove 221. When the driving member 1 moves in the first direction to axially disengage from the time-delay moving part 21, the radial force that keeps the first stop buckle radially opened outward is removed, so the axial movement restriction of the time-delay moving part 21 is released, and the first stop buckle can be radially retracted and leave the first limiting groove 221 under the drive of the power member 3, and the time-delay moving part 21 moves in the second direction.

[0070] In this embodiment, the time-delay moving part 21 is symmetrically provided with two first elastic arms, and the time-delay fixing part 22 is correspondingly symmetrically provided with two first limiting grooves 221 for accommodating the first elastic arms. Optionally, the axial length of the first elastic arm and the first limiting groove 221 is 5-12 mm; preferably, the abutting surface between the first limiting groove 221 and the first stop buckle can be an inclined straight surface or an arc surface, or other shapes, as long as the first stop buckle can generate radial and axial components of force at the abutting position.

[0071] By adopting the above technical solution, the far end of the driving member 1 pushes the piston 8 to the bottom of the medicine bottle 7, that is, after the push injection is basically completed, the axial restriction of the delay moving member 21 is automatically released and the delay is started, and the consistency of the push injection and the delay is stronger.

[0072] Further, refer to Figures 2 to 4 The delay member further includes a damper 23 disposed between the delay moving member 21 and the delay fixing member 22, and the damper 23 is used to slow down the speed at which the power member 3 pushes the delay moving member 21 to move in the first direction. The damper 23 can be in various forms, such as damping liquid and damping ring, which are used to increase the friction resistance of the delay moving member 21 during movement; or it can be an elastic member disposed on the delay fixing member 22, such as a spring, an elastic sheet, etc., which is used to provide a reaction force to offset the force of the power member 3 on the delay moving member 21.

[0073] Furthermore, the damper 23 includes a damping chamber containing a damping fluid; the delay moving part 21 continuously squeezes the damping fluid in the damping chamber during the process of moving from the initial static position to the second direction to the delay end position. During this process, the delay moving part 21 gradually compresses the damping chamber and squeezes the damping fluid out of the damping chamber, that is, the resistance of the damping fluid is used to delay the movement of the delay moving part 21, thereby realizing the delay function.

[0074] In this embodiment, the damping fluid is preferably a liquid with a relatively high dynamic viscosity, for example, a liquid with a dynamic viscosity of 5000cP to 100000cP can be selected as the damping fluid; in some more specific examples, the damping fluid can be damping oil, silicone oil or glycerin. In addition, in some other embodiments, some liquids with relatively low dynamic viscosity can also be used, for example, in some embodiments, a liquid with a dynamic viscosity less than 5000cP is selected as the damping fluid.

[0075] Furthermore, a sealing member is provided at the far end of the damping chamber, which can be provided between the delay moving member 21 and the delay fixing member 22, and is used to prevent the damping fluid from flowing out of the delay moving member 21 when the delay moving member 21 drives the sealing member to move in the second direction and squeezes the damping chamber. The sealing member can be a rubber ring.

[0076] By adopting the above technical solution, it can be ensured that the resistance distribution in the delay process is uniform, the movement of the delayed moving part 21 is more stable, and the delay time is controllable. Damping oils of different viscosities and volumes of damping oils are selected according to needs to adjust the resistance size or delay time.

[0077] Furthermore, the time-delay moving member 21 or the driving member 1 is provided with a positioning rod 211 along the central axis. Figures 2 to 6 The central axis of the time-delay moving part 21 is provided with a positioning rod 211, which extends axially from the distal end of the time-delay moving part 21 and is used to support the power part 3. In this embodiment, the positioning rod 211 can pass through the cavity of the driving part 1 and allow the compression spring to be sleeved on the positioning rod 211. The positioning rod 211 can be integrally provided with the time-delay moving part 21, or have an interference fit with the time-delay moving part 21, or can be fixedly connected with the time-delay moving part 21 by means of clamping, threaded connection, bonding, etc.

[0078] By adopting the above technical solution, it is beneficial to make the assembly of the power member 3, the driving member 1, and the delay moving member 21 more convenient and stable, and the force of the power member 3 is always maintained on the central axis, so that the driving force is more stable during the injection and delay process.

[0079] Reference Figure 5The embodiment of the present application also discloses an injection device, which includes a shell 9, a medicine bottle 7, a return needle assembly and the above-mentioned injection delay assembly; the return needle assembly includes a medicine bottle support 4 for accommodating the medicine bottle 7 and a return needle spring 5 for driving the medicine bottle support 4 to move in the second direction, the medicine bottle support 4 is fixedly connected to the delay fixing member 22 and its axial movement relative to the shell 9 is restricted before the return needle is triggered; when the delay moving member 21 moves to the delay end position, the axial movement restriction of the medicine bottle support 4 and the delay fixing member 22 is released, and the medicine bottle support 4 and the delay fixing member 22 are driven by the return needle spring 5 to move in the second direction.

[0080] In this embodiment, the proximal end of the return needle spring 5 abuts against the medicine bottle support 4, and the distal end abuts against the shell 9, and is always in a compressed state before the return needle; the proximal end of the medicine bottle support 4 and the distal end of the delay fixing member 22 can be fixedly connected by a snap connection, so the proximal end of the medicine bottle support 4 is limited by the delay fixing member 22; when the delay moving member 21 moves to the delay end position, the delay ends, and the axial restriction of the delay fixing member 22 and the shell 9 is released, and the return needle spring 5 can drive the medicine bottle support 4 and the delay fixing member 22 to move toward the proximal end of the injection device together, driving the medicine bottle 7 and the needle to retract into the shell 9.

[0081] Reference Figures 7 to 9 Preferably, one of the delay fixing piece 22 and the medicine bottle support piece 4 is provided with a bevel buckle 222, and the other is provided with a bevel slot 41 that allows the bevel buckle 222 to engage axially; the bevel buckle 222 and the bevel slot 41 are preferably two symmetrical groups to ensure that the medicine bottle support piece 4 and the delay fixing piece 22 are reliably connected.

[0082] In this embodiment, the proximal end of the delay fixture 22 is separated from the proximal end of the shell 9 by a return needle distance, and the return needle distance allows the return needle spring 5 to drive the delay fixture 22 and the medicine bottle support 4 to move in the second direction by at least a distance that can ensure that the needle is retracted into the shell 9. The return needle spring 5 drives the delay fixture 22 and the medicine bottle support 4 to move in the second direction together until the delay fixture 22 moves the above-mentioned return needle distance and hits the proximal end of the shell 9.

[0083] Reference Figure 4 , Figure 5 , Fig.10 Preferably, the proximal end of the delay fixture 22 is provided with an end cap 223, and the end cap 223 is integrally arranged or fixedly connected with the delay fixture 22, and is used to hit the proximal end of the shell 9 at the end of the return needle and generate sound feedback of the end of the return needle.

[0084] By adopting the above technical solution, the injection device can trigger the needle return action after the injection delay mechanism completes the delay. In addition, the injection device can provide sound feedback after the needle return is completed, indicating that the injection device has been used up, providing convenience for the user of the injection device.

[0085] Further, refer to Figure 3 , Figure 4 The injection device disclosed in the embodiment of the present application further includes a needle return trigger mechanism, which includes a needle return locking portion provided on the time-delay fixing member 22 and a needle return trigger portion provided on the time-delay moving member 21, and the housing 9 includes a stopper 91; the needle return locking portion and the stopper 91 jointly limit the axial movement of the time-delay fixing member 22 relative to the housing 9, and the needle return trigger portion is used to release the axial movement restriction of the time-delay fixing member 22 when the time-delay moving member 21 moves to the delay termination position. Specifically, the needle return locking portion cooperates with the stopper 91 of the housing 9 to limit the movement of the time-delay fixing member 22 in the second direction.

[0086] Reference Figure 3 , Figure 4 , Figures 6 to 8 In this embodiment, the delay moving part 21 includes a first section 215 located at its proximal end and a second section 216 located at the distal end of the first section 215, the return needle trigger part includes a return needle unlocking groove 213 arranged on the second section 216 of the delay moving part 21, and the return needle locking part includes a radially deformable return needle unlocking protrusion 224 arranged on the delay fixing part 22.

[0087] Reference Figure 3 Before the delay moving part 21 moves to the delay end position, the inner side of the return needle unlocking protrusion 224 abuts against the outer peripheral surface of the first section 215 of the delay moving part 21, and the first section 215 provides a radial force so that the return needle unlocking protrusion 224 abuts against the stop portion 91 of the shell 9. It should be noted that the abutting surface between the return needle unlocking protrusion 224 and the stop portion 91 of the shell 9 is a curved surface or an inclined surface, so that the return needle unlocking protrusion 224 can generate radial and axial component forces on the abutting surface.

[0088] Reference Figure 4When the delay moving part 21 moves to the delay termination position, the first section 215 and the second section 216 both move upward and make the return pin unlocking groove 213 of the delay moving part 21 move to the inner side of the return pin unlocking protrusion 224. The return pin unlocking protrusion 224 retracts radially inward into the return pin unlocking groove 213 under the action of the return pin spring 5, and slides away from the stopper 91 of the shell 9, thereby releasing the axial movement restriction of the delay fixing part 22, allowing the delay fixing part 22 and the cartridge support part to be driven by the return pin spring 5 to move in the second direction. Preferably, the delay fixing part 22 is symmetrically provided with two return pin unlocking protrusions 224, and the two return pin unlocking protrusions 224 are respectively abutted against the two stopper parts 91 on the shell 9; the delay moving part 21 is symmetrically provided with two return pin unlocking grooves 213 for accommodating the return pin unlocking protrusion 224.

[0089] Reference Fig.11 , Fig.12 In other embodiments, the needle return triggering part includes a needle return unlocking push arm 214 extending in the second direction and arranged on the time-delay moving part 21, and the needle return locking part includes a needle return unlocking hook 225 which is radially deformable and arranged on the time-delay fixing part 22, and a needle return unlocking slot 226 which radially accommodates the needle return unlocking hook 225, and the needle return unlocking hook 225 has a first straight surface 2251 at its distal end, and the corresponding stopper 91 of the housing 9 has a second straight surface 911, and after the time-delay fixing part 22 is assembled into the housing 9, the first straight surface 2251 is just in contact with the second straight surface 911, so that the time-delay fixing part 22 cannot move toward the proximal end of the housing 9. A first inclined surface 2252 is arranged at the distal end of the needle return unlocking hook 225, and a second inclined surface 2141 is arranged at the proximal end of the needle return unlocking push arm 214, and the first inclined surface 2252 and the second inclined surface 2141 have the same inclination direction, and both are radially inclined outward along the proximal direction.

[0090] Preferably, the first slope 2252 and the second slope 2141 have the same inclination angle. It should be noted that the length of the second slope 2141 is less than the length of the first slope 2252, so that after the second slope 2141 contacts the first slope 2252, the second slope 2141 can continue to slide along the first slope 2252 to apply radial force.

[0091] Reference Fig.11 , Fig.12Before the delay moving part 21 moves to the delay termination position, the return needle unlocking hook 225 and the stopper 91 of the shell 9 are in radially straight contact, and the proximal movement of the delay fixing part 22 relative to the shell 9 is limited by the stopper 91; when the delay moving part 21 moves to the delay termination position, the second inclined surface 2141 of the return needle unlocking push arm 214 abuts against the first inclined surface 2252 of the return needle unlocking hook 225 and the return needle unlocking hook 225 contracts radially inward until the first straight surface 2251 of the return needle unlocking hook 225 is disengaged from the second straight surface 911 of the stopper 91, and the return needle unlocking hook 225 is pushed into the return needle unlocking slot 226, and the axial movement restriction of the delay fixing part 22 is released. Fig.13 The time-delay fixing member 22 and the cartridge support member are driven by the return spring 5 to move in the second direction until the time-delay fixing member 22 contacts the distal end of the housing 9 .

[0092] Preferably, the delay fixing part 22 is symmetrically provided with two return needle unlocking hooks 225 and two return needle unlocking grooves 226 radially accommodating the return needle unlocking hooks 225, and the two return needle unlocking hooks 225 are respectively abutted against two stop parts 91 on the shell 9; the delay moving part 21 is symmetrically provided with two return needle unlocking push arms 214 for pushing the return needle unlocking hooks 225.

[0093] It should be noted that the driving force of the back-needle trigger mode provided in this embodiment is provided by a compression spring, so the axial distance between the second inclined surface 2141 and the first inclined surface 2252 can be the same as the axial displacement of the delay moving part 21 during the delay process, or less than the axial displacement of the delay moving part 21 during the delay process, thereby ensuring that the axial limit of the delay fixing part 22 can be released.

[0094] By adopting the above technical solution, the delay fixing member 22 and the medicine bottle support member 4 can be stably in an axially limited state during the injection period and the delay period, and the axially limited state is automatically released and the needle return is started when the delay ends.

[0095] Furthermore, the injection device disclosed in the embodiment of the present application also includes a trigger assembly located outside the injection delay assembly. The drive member 1 trigger assembly includes a trigger member 6 extending outside the distal end of the shell 9 and axially movable relative to the shell 9. The drive member 1 moves in a first direction relative to the shell 9 in a first position and is braked by the delay member.

[0096] Reference Figure 1 , Figure 7 In this embodiment, the delayed motion member 21 is provided with a second limiting portion 217, which can be a second elastic arm with a second stop buckle. The outer wall of the driving member 1 is provided with a second limiting groove 11, and the second stop buckle can move radially and can be stuck in the second limiting groove 11.

[0097] Reference Fig.14 ,15 A protruding inner wall 61 is provided at the distal end of the trigger member 6. In the untriggered position, the outer side of the second stop buckle is subjected to the radial force of the protruding inner wall 61 of the trigger member 6, ensuring that the second stop buckle is inserted into the second limiting groove 11, so that the driving member 1 is braked by the delayed moving member 21 before being triggered.

[0098] By moving the trigger member 6 to the trigger position in the first direction, the protruding inner wall 61 is removed from the outside of the second limiting groove 11, and the second stop buckle moves radially outward and disengages from the second limiting groove 11 under the action of the compression spring, thereby releasing the braking state of the driving member 1, so that the driving member 1 moves in the first direction under the drive of the power member 3 to inject the drug.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0100] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An injection delay component, characterized in that: include: A driving member, used for moving in a first direction to push the drug; A delay member, the delay member comprises a delay moving member and a delay fixing member, the delay moving member can move from an initial static position to a delay termination position relative to the delay fixing member, the axial movement of the delay moving member relative to the delay fixing member is restricted when in the initial static position, and the delay moving member triggers and / or prompts needle return when in the delay termination position; A power member disposed inside the driving member is used to drive the driving member to move from a first position to a second position in a first direction relative to the delay moving member; when the driving member is located at the second position, the axial movement restriction of the delay moving member is released, and the power member drives the delay moving member to move in the second direction to the delay end position.

2. The injection delay assembly according to claim 1, characterized in that: One of the delay moving part and the delay fixing part is provided with a first limiting portion that can be radially displaced, and the other is provided with a first limiting groove; when the first limiting portion is inserted into the first limiting groove, the axial movement of the delay moving part is restricted; when the first limiting portion is moved out of the first limiting groove, the axial movement restriction of the delay moving part is released.

3. The injection delay assembly according to claim 2, characterized in that: At least part of the driving member is sleeved inside the time-delay moving member, and the time-delay fixing member is sleeved outside the time-delay moving member; The first limiting portion is arranged at the distal end of the time-delay moving member, the first limiting groove is arranged at the distal end of the time-delay fixing member, the outer peripheral surface of the driving member contacts the first limiting portion, and the first limiting portion is supported by the radial force of the driving member so as to be inserted into the first limiting groove to limit the axial movement of the time-delay moving member; When the driving member is located at the second position, the driving member is separated from the time-delay moving member and the first limiting portion is no longer subjected to the radial force of the driving member, allowing the power member to drive the time-delay moving member to move axially.

4. The injection delay assembly according to claim 3, characterized in that: The delay element further includes a damper disposed between the delay moving element and the delay fixing element, and the damper is used for slowing down the speed of the delay moving element moving in the first direction.

5. The injection delay assembly according to claim 4, characterized in that: The damper includes a damping chamber containing a damping fluid; when the delay moving part moves from an initial static position to a second direction to a delay end position, the damping fluid in the damping chamber is squeezed out by the delay moving part to slow down the movement speed of the delay moving part.

6. The injection delay assembly according to any one of claims 1 to 5, characterized in that: The time-delay moving part or the driving part is provided with a positioning rod along the central axis, and the positioning rod extends axially to support the power part.

7. An injection device, characterized in that It comprises a housing, a medicine bottle, a needle return assembly and an injection delay assembly as claimed in any one of claims 1 to 6; The return needle assembly includes a medicine bottle support for accommodating a medicine bottle and a return needle spring for driving the medicine bottle support to move in a second direction, wherein the medicine bottle support is fixedly connected to the delay fixing member and is restricted in axial movement relative to the housing before the return needle is triggered; When the delay moving part moves to the delay termination position, the axial movement restriction of the medicine bottle support and the delay fixing part is released, and the medicine bottle support and the delay fixing part are driven by the return spring to move in the second direction.

8. The injection device according to claim 7, characterized in that It includes a return needle trigger mechanism, which includes a return needle locking part arranged on the delay fixing part and a return needle trigger part arranged on the delay moving part, and the shell includes a stop part; the return needle locking part and the stop part jointly limit the axial movement of the delay fixing part relative to the shell, and the return needle trigger part is used to release the axial movement restriction of the delay fixing part when the delay moving part moves to the delay end position.

9. The injection device according to claim 8, characterized in that The time-delay moving part comprises a first section located at the proximal end thereof and a second section located at the distal end of the first section, the needle return triggering part comprises a needle return unlocking groove arranged on the second section of the time-delay moving part, and the needle return locking part comprises a needle return unlocking protrusion which can be radially deformed and is arranged on the time-delay fixing part; Before the delay moving part moves to the delay termination position, the outer side of the return pin unlocking protrusion abuts against the inclined surface of the stopper, and the inner side of the return pin unlocking protrusion abuts against the first section of the delay moving part and locks the axial position of the return pin unlocking protrusion, thereby limiting the axial movement of the delay fixing part; When the delay moving part moves to the delay end position, the return needle unlocking groove moves to the inner side of the return needle unlocking protrusion, so that the return needle unlocking protrusion retracts radially inward into the return needle unlocking groove under the action of the return needle spring, thereby releasing the axial movement restriction of the delay fixing part.

10. The injection device according to claim 8, characterized in that The back-needle locking part includes a back-needle unlocking hook which is radially deformable and is arranged on the time-delay fixing part, and a back-needle unlocking slot which radially accommodates the back-needle unlocking hook, and the back-needle triggering part includes a back-needle unlocking push arm which is arranged on the time-delay moving part and extends in the second direction; Before the delay moving part moves to the delay termination position, the return pin unlocking hook directly contacts the stopper to limit the axial movement of the delay fixing part; When the delay moving part moves to the delay termination position, the return needle unlocking push arm abuts against the return needle unlocking hook and causes the return needle unlocking hook to radially retract into the return needle unlocking slot, thereby releasing the axial movement restriction of the delay fixing part.

11. The injection device according to claim 7, characterized in that Also included is a trigger assembly located outside the injection delay assembly, the trigger assembly including a trigger member extending outside the distal end of the housing and axially movable relative to the housing; The driving member moves in a first direction relative to the shell in a first position and is braked by the delay member. The trigger member can move in a second direction to a trigger position to release the initial braking state of the driving member, so that the driving member moves in the first direction under the drive of the power member to inject the drug.

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