Injection delay mechanism and injection device

Abstract

The application relates to an injection time-delay assembly and an injection device. The injection time-delay assembly comprises a driving member, a time-delay member and a power member. The driving member is used for moving in a first direction to inject medicine. The time-delay member comprises a time-delay moving member and a time-delay fixing member. The time-delay moving member can move from an initial static position to a time-delay end position relative to the time-delay fixing member. The axial movement of the time-delay moving member relative to the time-delay fixing member is limited when the time-delay moving member is at the initial static position. The time-delay moving member triggers and / or prompts needle retraction when the time-delay moving member is at the time-delay end position. The power member arranged in the driving member is used for driving the driving member to move from a first position to a second position in a first direction relative to the time-delay moving member. The axial movement limitation of the time-delay moving member is removed when the driving member is at the second position. The power member drives the time-delay moving member to move to the time-delay end position in a second direction. The application can delay the needle retraction time after injecting liquid medicine, so that the liquid medicine is further discharged, and the structure of the injection device can be simplified.

Description

TECHNICAL FIELD

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

[0002] An injection device is capable of injecting the medicine contained therein from the injection site of a user into the body of the user through a needle, which generally comprises a housing, a medicine bottle, an injection mechanism, wherein the medicine bottle is installed in the housing, and the medicine bottle comprises a bottle body, medicine placed in the bottle body, a needle at the distal end of the bottle body and a movable piston at the proximal end of the bottle body, and the injection mechanism is used for the user to operate to inject the medicine in the medicine bottle into the human body.

[0003] During actual injection, the injected medicine generally needs a period of time to be completely discharged from the medicine bottle, and the medicine also needs a certain period of time to be dispersed at the injection site, if the needle of the injection device is pulled out from the injection site immediately after the injection is completed, it may cause the medicine not to be completely discharged from the medicine bottle, and / or cause the medicine to flow out from the injection site, which will cause a part of the medicine not to be completely injected into the body of the user. The instructions of some injection devices prompt the user to wait for a few seconds before pulling out the needle after the injection is completed, so that the needle can stay at the injection site for a period of time; but the time of pulling out the needle depends on the user, which is not convenient for the user. SUMMARY

[0004] The existing injection device cannot guarantee that the injected medicine is completely discharged or dispersed at the injection site and flows out from the injection site because the time of pulling out the needle depends on the user, therefore, one of the purposes of the present application is to provide an injection delay mechanism for completely discharging the remaining medicine and guaranteeing that the medicine can be completely injected into the body of the user.

[0005] The second purpose of the present application is to provide an injection device comprising the injection delay mechanism provided in one of the above purposes for completely discharging the remaining medicine and guaranteeing that the medicine can be completely injected into the body of the user, and the injection device automatically triggers the needle to be pulled back after the delay is completed, which can improve the operation experience of the user.

[0006] The injection delay component provided in one of the purposes of the present application adopts the following technical scheme: an injection delay component, comprising a driving member, a delay member and a power member;

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

[0008] The time delay device comprises a time delay moving part and a time delay fixed part, the time delay moving part is movable relative to the time delay fixed part from an initial static position to a time delay end position, the axial movement of the time delay moving part relative to the time delay fixed part is limited in the initial static position, the time delay moving part triggers and / or prompts the needle retraction in the time delay end position;

[0009] A power part is arranged inside the driving part, for driving the driving part to move relative to the time delay moving part from a first position to a second position in a first direction, the axial movement of the time delay fixed part is released when the driving part is in the second position, and the power part drives the time delay moving part to move in a second direction to the time delay end position.

[0010] The first direction is defined as the direction pointing to the drug injection end, 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 the reference, the end close to the part of the human body where the injection device is operated is defined as the proximal end, and the end close to the part of the human body where the injection device is operated (i.e. the drug injection end) is defined as the distal end, i.e. the end away from the drug injection end of the injection device is the proximal end, and the end close to the drug injection end of the injection device is the distal end.

[0011] By adopting the above technical scheme, after the driving part is driven by the power part to inject the drug in the first direction, the needle retraction is not triggered or the user is not prompted to manually retract the needle, but the time delay part is driven by the power part in the second direction to perform the time delay operation; during the time delay, the distal end of the power part continues to push the driving part to extrude the piston in the medicine bottle to discharge the remaining medicine, and at the same time, the medicine is fully diffused at the injection position of the user.

[0012] Further, one of the time delay moving part and the time delay fixed part is provided with a first limiting part which is radially displaceable, and the other is provided with a first limiting groove; when the first limiting part is clamped into the first limiting groove, the axial movement of the time delay moving part is limited; when the first limiting part is moved out of the first limiting groove, the axial movement limitation of the time delay moving part is released.

[0013] Further, at least part of the driving part is arranged inside the time delay moving part, and the time delay fixed part is arranged outside the time delay moving part; the first limiting part is arranged at the distal end of the time delay moving part, the first limiting groove is arranged at the distal end of the time delay fixed part, the outer circumferential surface of the driving part is in contact with the first limiting part, and the first limiting part is supported by the radial force of the driving part to be clamped into the first limiting groove to limit the axial movement of the time delay moving part;

[0014] When the driving member is in the second position, the driving member is disengaged from the time-delay moving member and the first limiting portion is no longer subjected to the radial force of the driving member, so that the power member drives the time-delay moving member to move axially.

[0015] By using the above technical solution, the time delay can be automatically triggered after the bolus injection is completed.

[0016] Further, the time-delay member further comprises a damper arranged between the time-delay moving member and the time-delay fixed member, and the damper is used to slow down the speed of the time-delay moving member moving in the first direction.

[0017] Further, the damper comprises a damping chamber containing damping fluid, and in the process that the time-delay moving member moves from the initial static position to the time-delay termination position in the second direction, the damping fluid in the damping chamber is extruded out by the time-delay moving member to slow down the moving speed of the time-delay moving member.

[0018] By using the above technical solution, the process of time delay can be more stable, and the time delay time is controllable.

[0019] Further, 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 using the above technical solution, the force of the power member is always maintained on the central axis, so that the driving force is more stable during the injection and time delay.

[0021] The second purpose of the present application provides an injection device using the following technical solution:

[0022] An injection device comprises a housing, a medicament bottle, a needle retraction assembly and the above-mentioned injection time-delay assembly; the needle retraction assembly comprises a medicament bottle support for accommodating the medicament bottle and a needle retraction spring for driving the medicament bottle support to move in the second direction, and the medicament bottle support is fixedly connected with the time-delay fixed member and the axial movement of the medicament bottle support relative to the housing is limited before triggering the needle retraction.

[0023] When the time-delay moving member moves to the time-delay termination position, the axial movement limitation of the medicament bottle support and the time-delay fixed member is released, and the medicament bottle support and the time-delay fixed member are driven by the needle retraction spring to move in the second direction.

[0024] By using the above technical solution, the injection device can trigger the needle retraction action after the time delay mechanism is completed, which provides convenience for the user of the injection device.

[0025] Further, the needle returning trigger mechanism comprises a needle returning locking portion arranged on the delay fixing member and a needle returning trigger portion arranged on the delay moving member, and the shell comprises a stop portion; the needle returning locking portion and the stop portion jointly limit the axial movement of the delay fixing member relative to the shell, and the needle returning trigger portion is used for releasing the axial movement limitation of the delay fixing member when the delay moving member moves to the delay termination position.

[0026] Further, the delay moving member comprises a first section at the proximal end and a second section at the distal end of the first section, the needle returning trigger portion comprises a needle returning unlocking groove arranged on the second section of the delay moving member, and the needle returning locking portion comprises a radially deformable needle returning unlocking protrusion arranged on the delay fixing member; before the delay moving member moves to the delay termination position, the outer side of the needle returning unlocking protrusion abuts against the inclined surface of the stop portion, the inner side of the needle returning unlocking protrusion abuts against the first section of the delay moving member and locks the axial position of the needle returning unlocking protrusion, thereby limiting the axial movement of the delay fixing member; when the delay moving member moves to the delay termination position, the needle returning unlocking groove moves to the inner side of the needle returning unlocking protrusion, so that the needle returning unlocking protrusion is retracted radially inward into the needle returning unlocking groove under the action of the needle returning spring, thereby releasing the axial movement limitation of the delay fixing member.

[0027] Further, the needle returning locking portion comprises a radially deformable needle returning unlocking hook arranged on the delay fixing member and a needle returning unlocking hook slot for accommodating the needle returning unlocking hook, and the needle returning trigger portion comprises a needle returning unlocking push arm extending in the second direction arranged on the delay moving member; before the delay moving member moves to the delay termination position, the needle returning unlocking hook abuts against the straight surface of the stop portion, thereby limiting the axial movement of the delay fixing member; when the delay moving member moves to the delay termination position, the needle returning unlocking push arm abuts against the needle returning unlocking hook and makes the needle returning unlocking hook retract radially into the needle returning unlocking hook slot, thereby releasing the axial movement limitation of the delay fixing member.

[0028] By adopting the above technical scheme, the needle is automatically triggered to return at the end of the delay.

[0029] Further, the trigger assembly is arranged outside the injection delay assembly, and the trigger assembly comprises a trigger member extending to the distal end of the shell and axially movable relative to the shell; the drive member is braked by the delay member relative to the shell in the first position moving in the first direction, and the trigger member can be moved in the second direction to the trigger position, thereby releasing the initial braking state of the drive member, so that the drive member moves in the first direction under the driving of the power member to inject the medicine.

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

[0031] 1. To prolong the time the drug remains in the body after injection, and to allow for the continued elimination of any remaining drug during the extended period;

[0032] 2. Both the delay and injection driving forces are provided by a power component, resulting in a simple structure;

[0033] 3. The delay element is located at the near end of the housing, which simplifies the structure of the injection device, reduces the overall weight of the device, and makes it easier for the user to operate;

[0034] 4. The strong linkage between triggering, injection, delay, and needle return can improve the user's operating experience. Attached Figure Description

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

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

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

[0038] Figure 3 This is a schematic cross-sectional view of the injection device when the delayed motion component is in its initial static position, according to an embodiment of the present invention. Figure 1 ;

[0039] Figure 4 This is a cross-sectional view of the injection device when the delayed motion component is in the delayed termination position according to an embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of the structure of an injection device according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of a time-delay motion component according to an embodiment of the present invention;

[0042] Figure 7 This is 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 This is a schematic diagram of the structure of a time-delay fixing member according to an embodiment of the present invention. Figure 2 ;

[0044] Figure 9 This is a schematic diagram of the structure of a medicine bottle support member according to an embodiment of the present invention;

[0045] Figure 10 This is a schematic cross-sectional view of the injection device after the needle return is completed according to an embodiment of the present invention. Figure 1 ;

[0046] Figure 11 Cross-sectional structure of an injection device when a time delay moving part of an embodiment of the present application is in an initial rest position Figure 2 ;

[0047] Figure 12 Cross-sectional structure of an injection device when a time delay moving part of an embodiment of the present application is in a time delay end position Figure 2 ;

[0048] Figure 13 Cross-sectional structure of an injection device after needle returning of an embodiment of the present application Figure 2 ;

[0049] Figure 14 Cross-sectional structure of an injection device when a driving part of an embodiment of the present application is in a first position

[0050] Figure 15 Cross-sectional structure of an injection device when a driving part of an embodiment of the present application is in a second position

[0051] Reference signs: 1, driving part; 11, second limiting groove; 21, time delay moving part; 211, positioning rod; 212, first limiting part; 213, needle returning unlocking groove; 214, needle returning unlocking push arm; 2141, second inclined surface; 215, first section; 216, second section; 217, second limiting part; 22, time delay fixing part; 221, first limiting groove; 222, inclined surface insertion buckle; 223, end cover; 224, needle returning unlocking protrusion; 225, needle returning unlocking hook; 2251, first straight surface; 2252, first inclined surface; 226, needle returning unlocking clamping groove; 23, damper; 3, power part; 4, medicine bottle supporting part; 41, inclined surface insertion groove; 5, needle returning spring; 6, trigger part; 61, protruding inner wall; 7, medicine bottle; 8, piston; 9, housing; 91, stop part; 911, second straight surface. DETAILED DESCRIPTION

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

[0053] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0054] In the description of the present application, 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 the reference, the end close to the part of the human body where the injection device is operated is defined as the proximal end, and the end close to the part of the human body where the injection device is operated is defined as the distal end, i.e. 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 specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] The injection device can inject the drug contained therein into the user's body through the needle from the injection site of the user, which generally includes a housing, a medicine bottle, an injection mechanism, wherein the medicine bottle is mounted in the housing, and the medicine bottle includes a bottle body, a drug placed in the bottle body, a needle at the distal end of the bottle body and a movable piston at the proximal end of the bottle body, and the injection mechanism is used for the user to operate to inject the drug liquid in the medicine bottle into the human body.

[0057] During an actual injection, the injected drug usually needs a period of time to be completely discharged from the medicine bottle, and the drug also needs a certain period of time to be dispersed 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 of the injection site, which causes a part of the drug not to be completely injected into the user's body. The instructions for use of some injection devices prompt the user to wait for a few seconds before pulling out the needle after the injection is completed, so that the needle can stay at the injection site for a period of time; but the time for pulling out the needle depends on the user, which is not convenient for the user.

[0058] Therefore, some injection devices are provided with a delay mechanism for automatically delaying the time for the needle to stay. In the related art, some injection devices set a damper for delaying in the distal end of the housing, such as in the medicine bottle. After the injection, the delay mechanism can be driven by a power spring to press the damper in the medicine bottle. However, according to the related standards, the radial size of the medicine bottle cannot be increased, and setting the damper in the medicine bottle causes the overall injection device to be axially long, which is not easy for the user to operate. Some injection devices do not set the delay mechanism in the medicine bottle, and thus need a power spring to provide driving force, which is different from the spring for driving the injection. As a result, the injection device has a large number of components and a complex structure.

[0059] Therefore, the embodiments of the present application disclose an injection delay mechanism. The delay mechanism and the driving force source of the driving member for injecting the drug are derived from the same power member. During the delay, the distal end of the power member continues to push the driving member to press the piston in the medicine bottle, so that the power member drives the piston to completely discharge the remaining drug while driving the delay. Setting the delay mechanism in the proximal end of the housing 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. Reference 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 an external force, the driving member 1 can drive the piston 8 to move in a first direction together to inject the drug in the medicine bottle 7. Before the delay is started, the delay moving member 21 is located at an initial static position. When the delay moving member 21 is at the initial static position, the axial movement of the delay moving member 21 relative to the delay fixing member 22 is limited. Reference Figure 3 , Figure 4 After the delay is started, the delay moving member 21 can move relative to the delay fixing member 22 from the initial static position to a delay termination position. When the delay moving member 21 is at the delay termination position, the needle is triggered and / or prompted to be withdrawn.

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

[0062] In the embodiment, the driving member 1, the time delay moving member 21 and the time delay fixing member 22 are preferably cylindrical bodies with channels inside, and the power member 3 is preferably a compression spring; the driving member 1 has an opening at the proximal end for placing the power member 3, and is closed at the distal end. The distal end of the power member 3 abuts against the driving member 1, and is configured to push the driving member 1 to move in the first direction until the injection is completed. The proximal end of the power member 3 abuts against the time delay moving member 21, and is configured to push the time delay moving member 21 to move from the initial static position to the time delay end position in the second direction after the time delay is started, and during the time delay, the distal end of the power member 3 will continue to push the driving member 1 to press the piston 8 to continue to expel the medicine. In some specific examples, the driving member 1 in the second position relative to the time delay moving member 21 is configured to be in the position adjacent to the injection end position of the driving member 1 to push the piston 8 to move to implement the injection, and during the time delay, the driving member 1 will continue to move from the second position to the injection end position to press the piston 8 and make the piston 8 move in the first direction; in other specific examples, the driving member 1 in the second position relative to the time delay moving member 21 is configured to have already pushed the piston 8 to the injection end position to implement the injection, and during the time delay, the driving member 1 is maintained in the state of pressing the piston 8.

[0063] It can be understood that if the injection device to which the injection time delay mechanism is applied is an automatic trigger and an automatic needle retraction, when the time delay moving member 21 moves to the time delay end position, the needle retraction can be automatically triggered, that is, after the time delay ends, the medicine bottle in the injection device to which the injection time delay mechanism is applied is configured to move in the second direction to make the needle move out of the injection site of the user; in addition, when the needle retraction is triggered, a feedback for prompting the end of the time delay or the start of the needle retraction can be generated, which can be a certain visual effect or a sound feedback, for reminding the user that the injection process has ended and the needle will be removed; if the injection device to which the injection time delay mechanism is applied is a manual trigger and a manual needle retraction, when the time delay moving member 21 moves to the time delay end position, a feedback for prompting the end of the time delay or the start of the needle retraction can be generated, which can be a certain visual effect or a sound feedback, for prompting the user to manually remove the injection device at this time to remove the needle from the injection site.

[0064] By adopting the above technical scheme, after the driving member 1 is driven by the power member 3 to push the medicine in the first direction, the needle is not immediately triggered back or the user is not immediately prompted to manually trigger the needle back, but the power member 3 drives the delay member in the second direction to perform a delay operation; during the delay, the distal end of the power member 3 continues to push the driving member 1 to extrude the piston 8 in the medicine bottle 7 to discharge the remaining medicine, and at the same time, the medicine is fully diffused at the injection position of the user.

[0065] Further, referring to Figures 2 to 3 、 Figures 6 to 8 , one of the delay moving member 21 and the delay fixing member 22 is provided with a first limiting part 212 which can be radially displaced, and the other is provided with a first limiting groove 221; referring to Figure 2 , when the first limiting part 212 is clamped into the first limiting groove 221, the axial movement of the delay moving member 21 is limited; referring to Figure 3 , the first limiting part 212 can be moved out of the first limiting groove 221 to release the axial movement limitation of the delay moving member 21.

[0066] In the embodiment, the delay moving member 21 is sleeved with the delay fixing member 22, specifically, the delay moving member 21 can be sleeved outside the delay fixing member 22, or the delay fixing member 22 can be sleeved outside the delay moving member 21.

[0067] Further, referring to Figures 1 to 3 , further, at least part of the driving member 1 is sleeved inside the delay moving member 21, and the delay fixing member 22 is sleeved outside the delay moving member 21; the first limiting part 212 is arranged at the distal end of the delay moving member 21, and the first limiting groove 221 is arranged at the distal end of the delay fixing member 22; the outer circumferential surface of the driving member 1 is in contact with the first limiting part 212, the first limiting part 212 is supported by the radial force of the driving member 1 and is clamped into the first limiting groove 221 to limit the axial movement of the delay moving member 21; when the driving member 1 is located at the second position, the distal end of the driving member 1 is separated from the delay moving member 21 and the first limiting part 212 is no longer supported by the radial force of the driving member 1, so that the power member 3 drives the delay moving member 21 to move axially. By adopting the above technical scheme, the delay can be automatically triggered after the injection is completed.

[0068] Further, referring to Figure 2 、 Figure 3, the first limiting part 212 is arranged at the distal end of the delay moving part 21, the first limiting groove 221 is arranged at the distal end of the delay fixing part 22, the outer circumferential surface of the driving part 1 is in contact with the first limiting part 212, the limiting part is supported by the radial force of the driving part 1 and is clamped into the first limiting groove 221, so that the movement of the delay moving part 21 in the second direction is limited by the delay fixing part 22, thereby keeping the delay moving part 21 in the limiting state; when the driving part 1 pushes the piston 8 to the bottom of the medicine bottle 7, the driving part 1 is separated from the delay moving part 21, the first limiting part 212 is no longer subjected to the radial force of the driving part 1, allowing the power part 3 to drive the delay moving part 21 to move axially, at this time the distal end of the driving part 1 pushes the piston 8 to the bottom of the medicine bottle 7.

[0069] In the embodiment, the first limiting part 212 can be a first elastic arm with a first stopper buckle, when the delay moving part 21 is kept in the limiting state, the first stopper buckle is subjected to the radial force of the driving part 1 and is radially outwardly opened and clamped in the first limiting groove 221. When the driving part 1 moves in the first direction to axially separate from the delay moving part 21, the radial force keeping the first stopper buckle radially outwardly opened is removed, so that the axial movement limitation of the delay moving part 21 is released, the first stopper buckle can radially inwardly shrink and leave the first limiting groove 221 under the driving of the power part 3, and the delay moving part 21 moves in the second direction.

[0070] In the embodiment, the delay moving part 21 is symmetrically provided with two first elastic arms, and the delay fixing part 22 is symmetrically provided with two first limiting grooves 221 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 of the first limiting groove 221 and the first stopper buckle can be an inclined straight surface or a circular arc surface, or other shapes, as long as the first stopper buckle can generate radial and axial components at the abutting position.

[0071] By adopting the above technical scheme, the distal end of the driving part 1 pushes the piston 8 to the bottom of the medicine bottle 7, that is, after the basic end of the injection, the axial limitation of the delay moving part 21 is automatically released and the delay is started, and the continuity of the injection and the delay is stronger.

[0072] Further, with reference to Figures 2 to 4 The delay part further comprises a damper 23 arranged between the delay moving part 21 and the delay fixing part 22, the damper 23 is used to delay the speed of the power part 3 pushing the delay moving part 21 to move in the first direction. The damper 23 can be in various forms, such as damping liquid, damping ring, used to increase the frictional resistance when the delay moving part 21 moves; or can be an elastic member arranged on the delay fixing part 22, such as spring, elastic sheet, etc., used to provide a reaction force to offset the force of the power part 3 on the delay moving part 21.

[0073] Further, the damper 23 comprises a damping chamber containing damping fluid; during the process that the delay moving part 21 moves from the initial static position to the second direction to the delay end position, the damping fluid in the damping chamber is continuously extruded, in this process, the delay moving part 21 gradually compresses the damping chamber and extrudes the damping fluid out of the damping chamber, that is, the movement of the delay moving part 21 is delayed by the resistance of the damping fluid, thereby realizing the delay function.

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

[0075] Further, the distal end of the damping chamber is also provided with a sealing member, which can be arranged between the delay moving part 21 and the delay fixed part 22, for preventing the damping fluid from flowing out of the delay moving part 21 when the delay moving part 21 drives the sealing member to move in the second direction and extrude the damping chamber, and the sealing member can be selected as a rubber ring.

[0076] By using the above technical solution, the resistance distribution during the delay process can be uniform, the movement of the delay moving part 21 is more stable, and the delay time is controllable, and different viscosity damping oils can be selected according to the requirements to adjust the resistance or delay time.

[0077] Further, the delay moving part 21 or the driving part 1 is provided with a positioning rod 211 along the central axis, in the embodiment, referring to Figures 2 to 6 The central axis of the delay moving part 21 is provided with a positioning rod 211, the positioning rod 211 extends axially from the distal end of the delay moving part 21 and is used to support the power part 3. In the embodiment, the positioning rod 211 can pass through the cavity of the driving part 1 and make the compression spring sleeved on the positioning rod 211, the positioning rod 211 can be integrally arranged with the delay moving part 21, or can be fixedly connected with the delay moving part 21 by interference fit, or can be fixedly connected with the delay moving part 21 by clamping, threaded connection, adhesion and the like.

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

[0079] Referring to Figure 5The injection device comprises a housing 9, a medicament bottle 7, a needle retraction assembly and the above-mentioned injection delay assembly; the needle retraction assembly comprises a medicament bottle support 4 for accommodating the medicament bottle 7 and a needle retraction spring 5 for driving the medicament bottle support 4 to move in a second direction, the medicament bottle support 4 is fixedly connected with the delay fixing member 22 and the axial movement of the medicament bottle support 4 relative to the housing 9 is limited before the needle retraction; when the delay moving member 21 moves to the delay termination position, the axial movement limitation of the medicament bottle support 4 and the delay fixing member 22 is released, and the medicament bottle support 4 and the delay fixing member 22 are driven by the needle retraction spring 5 to move in the second direction.

[0080] In the embodiment, the proximal end of the needle retraction spring 5 abuts against the medicament bottle support 4, and the distal end abuts against the housing 9, and the needle retraction spring 5 is always in a compressed state before the needle retraction; the proximal end of the medicament bottle support 4 and the distal end of the delay fixing member 22 are fixedly connected in a snap connection manner, so that the proximal end of the medicament bottle support 4 is limited by the delay fixing member 22; when the delay moving member 21 moves to the delay termination position, the delay is terminated, the axial limitation of the delay fixing member 22 relative to the housing 9 is released, and the needle retraction spring 5 can drive the medicament bottle support 4 and the delay fixing member 22 to move together towards the proximal end of the injection device, and drive the medicament bottle 7 and the needle to retract into the housing 9.

[0081] With reference to Figures 7 to 9 , preferably, one of the delay fixing member 22 and the medicament bottle support 4 is provided with an inclined surface insertion buckle 222, and the other is provided with an inclined surface insertion slot 41 allowing the inclined surface insertion buckle 222 to be axially engaged; the inclined surface insertion buckle 222 and the inclined surface insertion slot 41 are preferably two symmetrical groups to ensure reliable connection of the medicament bottle support 4 and the delay fixing member 22.

[0082] In the embodiment, the proximal end of the delay fixing member 22 is spaced apart from the end of the proximal end of the housing 9 by a needle retraction distance, which ensures that the distance by which the needle retraction spring 5 drives the delay fixing member 22 and the medicament bottle support 4 to move in the second direction can at least ensure that the needle is retracted into the housing 9, and the needle retraction spring 5 drives the delay fixing member 22 and the medicament bottle support 4 to move together in the second direction until the delay fixing member 22 hits the end of the proximal end of the housing 9 after moving the above-mentioned needle retraction distance.

[0083] With reference to Figure 4 , Figure 5 , Figure 10 , preferably, the proximal end of the delay fixing member 22 is provided with an end cover 223, which is integrally arranged or fixedly connected with the delay fixing member 22, for hitting the end of the proximal end of the housing 9 when the needle retraction is completed and generating a sound feedback of the end of the needle retraction.

[0084] By adopting the technical scheme, the injection device can trigger the needle returning action after the delay mechanism completes the delay, and can provide sound feedback after the needle returning action is completed, indicating that the injection device has been used, thereby providing convenience for the user of the injection device.

[0085] Further, with reference to Figure 3 、 Figure 4 , the injection device disclosed in the embodiment of the present application further comprises a needle returning trigger mechanism, the needle returning trigger mechanism comprises a needle returning locking part arranged on the delay fixing part 22 and a needle returning trigger part arranged on the delay moving part 21, and the shell 9 comprises a stop part 91; the needle returning locking part and the stop part 91 jointly limit the axial movement of the delay fixing part 22 relative to the shell 9, and the needle returning trigger part is used to release the axial movement limitation of the delay fixing part 22 when the delay moving part 21 moves to the delay termination position. Specifically, the needle returning locking part abuts against the stop part 91 of the shell 9, thereby limiting the movement of the delay fixing part 22 to the second direction.

[0086] With reference to Figure 3 、 Figure 4 、 Figures 6 to 8 , in the embodiment, the delay moving part 21 comprises a first section 215 at the proximal end and a second section 216 at the distal end of the first section 215, the needle returning trigger part comprises a needle returning unlocking groove 213 arranged on the second section 216 of the delay moving part 21, and the needle returning locking part comprises a radially deformable needle returning unlocking protrusion 224 arranged on the delay fixing part 22.

[0087] With reference to Figure 3 , before the delay moving part 21 moves to the delay termination position, the inner side of the needle returning 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 to make the needle returning unlocking protrusion 224 abut against the stop part 91 of the shell 9. It should be noted that the abutting surface of the needle returning unlocking protrusion 224 and the stop part 91 of the shell 9 is a curved surface or an inclined surface, so that the needle returning unlocking protrusion 224 can generate radial and axial components on the abutting surface.

[0088] With reference to Figure 4When the delayed motion component 21 reaches the delayed termination position, both the first section 215 and the second section 216 move upwards, causing the return needle unlocking groove 213 of the delayed motion component 21 to move to the inside of the return needle unlocking protrusion 224. Under the action of the return needle spring 5, the return needle unlocking protrusion 224 retracts radially inward into the return needle unlocking groove 213, sliding away from the stop portion 91 of the housing 9, thereby releasing the axial movement restriction of the delayed fixing component 22, allowing the delayed fixing component 22 and the cartridge support component to move in the second direction driven by the return needle spring 5. Preferably, the delayed fixing component 22 is symmetrically provided with two return needle unlocking protrusions 224, which respectively abut against the two stop portions 91 on the housing 9; the delayed motion component 21 is symmetrically provided with two return needle unlocking grooves 213 for accommodating the return needle unlocking protrusions 224.

[0089] Reference Figure 11 , Figure 12 In other embodiments, the return pin triggering part includes a return pin unlocking push arm 214 extending in a second direction and disposed on the delayed motion member 21. The return pin locking part includes a radially deformable return pin unlocking hook 225 and a return pin unlocking groove 226 radially accommodating the return pin unlocking hook 225, disposed on the delayed fixing member 22. The distal end of the return pin unlocking hook 225 has a first straight surface 2251, and the corresponding stop part 91 of the housing 9 has a second straight surface 911. After the delayed fixing member 22 is assembled into the housing 9, the first straight surface 2251 abuts against the second straight surface 911, preventing the delayed fixing member 22 from moving towards the proximal end of the housing 9. The distal end of the return pin unlocking hook 225 has a first inclined surface 2252, and the proximal end of the return pin unlocking push arm 214 has a second inclined surface 2141. The inclination directions of the first inclined surface 2252 and the second inclined surface 2141 are consistent, both being radially outward along the proximal direction.

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

[0091] Reference Figure 11 , Figure 12, before the time delay moving part 21 moves to the time delay end position, the needle return unlocking clamping hook 225 is in radial surface abutment with the stop portion 91 of the shell 9, and the proximal end movement of the time delay fixing part 22 relative to the shell 9 is limited by the stop portion 91; when the time delay moving part 21 moves to the time delay end position, the second inclined surface 2141 of the needle return unlocking push arm 214 is in abutment with the first inclined surface 2252 of the needle return unlocking clamping hook 225, and the needle return unlocking clamping hook 225 is radially retracted inward until the first straight surface 2251 of the needle return unlocking clamping hook 225 is disengaged from the second straight surface 911 of the stop portion 91, the needle return unlocking clamping hook 225 is pushed into the needle return unlocking clamping groove 226, and the axial movement limitation of the time delay fixing part 22 is released, refer to Figure 13 , the time delay fixing part 22 and the cartridge support part are driven by the needle return spring 5 to move in the second direction until the time delay fixing part 22 contacts the distal end of the shell 9.

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

[0093] It should be noted that the driving force of the needle return trigger mode provided in the embodiment is provided by the 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 time delay moving part 21 during the time delay, or less than the axial displacement of the time delay moving part 21 during the time delay, so as to ensure that the axial limitation of the time delay fixing part 22 can be released.

[0094] By adopting the above technical scheme, the time delay fixing part 22 and the cartridge support part 4 can stably be in the axial limited state during the injection and the time delay, and the axial limited state is automatically released and the needle return is started when the time delay ends.

[0095] Further, the injection device disclosed in the embodiment of the application further comprises a trigger assembly located outside the injection time delay assembly, the driving member 1 trigger assembly comprises a trigger member 6 extending to the distal end outside the shell 9 and axially movable relative to the shell 9, and the driving member 1 is braked by the time delay member relative to the shell 9 when moving in the first direction.

[0096] Refer to Figure 1 , Figure 7 In the embodiment, the time delay moving part 21 is provided with a second limiting portion 217, which can be a second elastic arm with a second stop buckle, and the outer wall of the driving member 1 is provided with a second limiting groove 11, and the second stop buckle is radially movable and can be clamped into the inside of the second limiting groove 11.

[0097] Refer to Figure 14 ,15 The distal end of the trigger 6 is provided with a protruding inner wall 61. In the untriggered position, the second stopper is clamped into the second limiting groove 11 by the radial force of the protruding inner wall 61 of the trigger 6, so that the driving member 1 is braked by the delay movement member 21 before triggering.

[0098] By moving the trigger 6 to the triggered position in the first direction, the protruding inner wall 61 is removed from the outside of the second limiting groove 11, the second stopper is moved radially outward under the action of the compression spring and is disengaged from the second limiting groove 11, so that the braking state of the driving member 1 is released, and the driving member 1 is moved in the first direction under the drive of the power member 3 to inject the medicine.

[0099] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0100] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An injection delay assembly characterized by, The injection device comprises: a driving member for moving in a first direction to inject a medicament; a delay member, the delay member comprising a delay moving member and a delay fixed member, the delay moving member is movable relative to the delay fixed member from an initial rest position to a delay end position, the delay moving member is restricted in axial movement relative to the delay fixed member at the initial rest position, the delay moving member triggers and / or prompts needle retraction at the delay end position; a power member inside the driving member for driving the driving member to move relative to the delay moving member from a first position to a second position in a first direction, the driving member is released from the restriction of axial movement of the delay moving member when at the second position, and the power member drives the delay moving member to move in a second direction to the delay end position; one of the delay moving member and the delay fixed member is provided with a first limiting portion which is radially displaceable, and the other is provided with a first limiting slot, the axial movement of the delay moving member is restricted when the first limiting portion is engaged in the first limiting slot, the axial movement of the delay moving member is released when the first limiting portion is disengaged from the first limiting slot; at least part of the driving member is sleeved inside the delay moving member, and the delay fixed member is sleeved outside the delay moving member; the first limiting portion is provided at the distal end of the delay moving member, the first limiting slot is provided at the distal end of the delay fixed member, the outer circumferential surface of the driving member is in contact with the first limiting portion, the first limiting portion is supported by the radial force of the driving member so as to be engaged in the first limiting slot to restrict the axial movement of the delay moving member; when the driving member is at the second position, the driving member is disengaged from the delay moving member and the first limiting portion is no longer supported by the radial force of the driving member, allowing the power member to drive the axial movement of the delay moving member.

2. The injection delay assembly of claim 1, wherein, The delay member further comprises a damper provided between the delay moving member and the delay fixed member, the damper is used to slow down the speed of the delay moving member moving in a first direction.

3. The injection delay assembly of claim 2, wherein, The damper comprises a damping chamber containing damping fluid, during the process of the delay moving member moving from the initial rest position to the delay end position in a second direction, the damping fluid in the damping chamber is extruded out by the delay moving member to slow down the movement speed of the delay moving member.

4. The injection delay assembly of any one of claims 1 to 3, wherein, The delay moving member or the driving member is provided with a positioning rod along the central axis, the positioning rod axially extends for supporting the power member.

5. Injection device, characterized in that The injection device comprises a housing, a medicament bottle, a needle retraction assembly, and an injection delay assembly as claimed in any one of claims 1-4; The needle retraction assembly comprises a medicament bottle support for accommodating the medicament bottle, and a needle retraction spring for driving the medicament bottle support to move in a second direction, the medicament bottle support is fixedly connected with the delay fixed member and is restricted in axial movement relative to the housing before triggering needle retraction; The axial movement of the medicament bottle support and the delay fixed member is released when the delay moving member moves to the delay end position, and the medicament bottle support and the delay fixed member are driven by the needle retraction spring to move in the second direction.

6. An injection device according to claim 5, wherein, The needle return trigger mechanism comprises a needle return locking part arranged on the delay fixing member and a needle return trigger part arranged on the delay moving member, and the shell comprises a stop part; the needle return locking part and the stop part jointly limit the axial movement of the delay fixing member relative to the shell, and the needle return trigger part is used for releasing the axial movement limitation of the delay fixing member when the delay moving member moves to the delay termination position.

7. An injection device according to claim 6, wherein, The delay moving member comprises a first section at the proximal end and a second section at the distal end of the first section, the needle return trigger part comprises a needle return unlocking groove arranged on the second section of the delay moving member, and the needle return locking part comprises a radially deformable needle return unlocking protrusion arranged on the delay fixing member; Before the delay moving member moves to the delay termination position, the outer side of the needle return unlocking protrusion abuts against the inclined surface of the stop part, the inner side of the needle return unlocking protrusion abuts against the first section of the delay moving member and locks the axial position of the needle return unlocking protrusion, thereby limiting the axial movement of the delay fixing member; When the delay moving member moves to the delay termination position, the needle return unlocking groove moves to the inner side of the needle return unlocking protrusion, so that the needle return unlocking protrusion is retracted radially inward into the needle return unlocking groove under the action of the needle return spring, thereby releasing the axial movement limitation of the delay fixing member.

8. An injection device according to claim 6, wherein, The needle return locking part comprises a radially deformable needle return unlocking hook arranged on the delay fixing member and a needle return unlocking hook slot radially accommodating the needle return unlocking hook, and the needle return trigger part comprises a needle return unlocking push arm extending in the second direction arranged on the delay moving member; Before the delay moving member moves to the delay termination position, the needle return unlocking hook abuts against the straight surface of the stop part, thereby limiting the axial movement of the delay fixing member; When the delay moving member moves to the delay termination position, the needle return unlocking push arm abuts against the needle return unlocking hook and makes the needle return unlocking hook retract radially into the needle return unlocking hook slot, thereby releasing the axial movement limitation of the delay fixing member.

9. The injection device of claim 5, wherein, The trigger assembly arranged outside the injection delay assembly comprises a trigger member extending to the distal end of the shell and axially movable relative to the shell; The drive member is braked by the delay member in the first position relative to the shell in the first direction, the trigger member can be moved in the second direction to the trigger position to release the initial braking state of the drive member, so that the drive member is driven by the power member to move in the first direction to inject the drug.

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