Feedback optimization type injection pen

Abstract

The invention discloses a feedback optimization type injection pen, and relates to the technical field of medical instruments, the feedback optimization type injection pen comprises a pen body mechanism, an adjusting mechanism and an injection mechanism; the pen body mechanism comprises a pen body, the pen body is provided with an outer pen cylinder and an inner pen cylinder, and a feedback rib position is arranged on the outer side of the inner pen cylinder; the adjusting mechanism comprises a dosage hub, the outer side of the dosage hub is in threaded fit with the pen outer barrel, the dosage hub is provided with an elastic arm, and the elastic arm makes contact with the feedback rib position to generate feedback when the dosage hub rotates. The injection mechanism and the adjusting mechanism have a coupling state and a decoupling state, and when the injection mechanism is coupled with the adjusting mechanism, the injection mechanism pushes and injects liquid medicine in the medicine bottle container under the action of the adjusting mechanism. According to the feedback optimization type injection pen, through the design of the inner barrel and the outer barrel of the pen body, the assembling relation between the pen body and the dosage hub is strengthened, accurate adjustment feedback is generated through contact between the elastic arms and the feedback rib positions in the dosage adjustment process, and therefore the accuracy of dosage setting and the reliability of the injection pen are improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a feedback-optimized injection pen. Background Art

[0002] As a convenient drug delivery tool, an injection pen usually includes main components such as an injection needle, a medicine bottle container, and a pen body. Through the dose adjustment mechanism, the operator can set the injection dose according to needs.

[0003] In practice, the inventors found that the existing injection pens have some defects. The dosage adjustment feedback of the injection pen is not accurate enough. Due to the large assembly gap between the dosage adjustment structures, the dosage adjustment structure is easily loosened, which may lead to inaccurate dosage setting and make it impossible to meet the accurate drug injection amount. Summary of the invention

[0004] The purpose of the present application is to provide a feedback-optimized injection pen, which strengthens the assembly relationship with the dosage hub through the inner and outer double-barrel design of the pen body, and generates precise adjustment feedback through the contact between the elastic arm and the feedback rib during the dosage adjustment process, thereby improving the accuracy of dosage setting and the reliability of the injection pen.

[0005] To achieve the above-mentioned purpose, the present application provides a feedback-optimized injection pen, comprising a pen body mechanism, an adjustment mechanism and an injection mechanism;

[0006] The pen body mechanism comprises a pen body, wherein the pen body comprises an outer pen tube and an inner pen tube, and a feedback rib position is arranged on the outer side of the inner pen tube;

[0007] The adjustment mechanism comprises a dose hub, the outer side of which is threadedly matched with the outer barrel of the pen, and the dose hub is provided with an elastic arm, and the elastic arm contacts the feedback rib to generate feedback when the dose hub rotates;

[0008] The injection mechanism and the regulating mechanism have two states, namely, coupling and decoupling. When the injection mechanism is coupled with the regulating mechanism, the injection mechanism pushes the liquid medicine in the medicine bottle container under the action of the regulating mechanism.

[0009] In some embodiments, the elastic arm is used to be deformed by the injection mechanism to separate from the feedback rib when the injection mechanism is coupled with the adjustment mechanism; when the injection mechanism is decoupled from the adjustment mechanism, the elastic arm maintains contact with the feedback rib.

[0010] In some embodiments, the injection mechanism comprises:

[0011] A clutch is arranged inside the dosage hub, the clutch is rotatable and movable, the clutch is connected to an injection button located at the distal end of the pen body mechanism, and the clutch and the dosage hub have two states of coupling and decoupling at different moving positions of the clutch;

[0012] A push rod sleeve is arranged inside the clutch, and the push rod sleeve rotates under the restriction of the clutch;

[0013] A push rod is arranged inside the push rod sleeve. The push rod can move and rotate under the restriction of the push rod sleeve. The push rod is threadedly matched with the pen body mechanism. A push rod buckle is provided at the proximal end of the push rod, and the push rod buckle is used to push the rubber stopper of the medicine bottle container.

[0014] In some embodiments, the clutch comprises a clutch outer cylinder and a clutch inner cylinder, and the push rod sleeve is arranged between the clutch outer cylinder and the clutch inner cylinder.

[0015] In some embodiments, an axial rib is disposed on the outer side of the clutch inner cylinder, and an axial groove cooperating with the axial rib is disposed on the inner side of the push rod sleeve to enable the push rod sleeve to rotate under the restriction of the clutch.

[0016] In some embodiments, a coupling protrusion is provided at the distal end of the clutch, and a coupling spline is provided at the distal end of the dosage hub, and the coupling protrusion and the coupling spline have two states of coupling and decoupling at different moving positions of the clutch;

[0017] When the clutch moves toward the proximal end of the dosage hub, the coupling protrusion is coupled with the coupling spline, and the dosage hub moves toward the proximal end of the pen body driven by the clutch; when the coupling protrusion is decoupled from the coupling spline, the clutch moves toward the distal end of the pen body driven by the dosage hub.

[0018] In some embodiments, the elastic arm is provided at the proximal end of the dose hub, a limiting groove is provided at the distal end of the dose hub, and the moving position of the clutch is limited by the elastic arm and the limiting groove;

[0019] When the clutch is coupled to the dosage hub, the proximal end of the clutch pushes the elastic arm, and the elastic arm is separated from the feedback rib; when the clutch is decoupled from the dosage hub, the elastic arm maintains contact with the feedback rib.

[0020] In some embodiments, a spring sheet is disposed on the outer side of the push rod sleeve, and the spring sheet contacts the pen body mechanism to generate feedback when the push rod sleeve rotates.

[0021] In some embodiments, the pen body mechanism includes a push rod nut, which is connected to the pen body. The push rod is passed through the push rod nut and cooperates with the push rod thread. The push rod nut is provided with a ratchet hole, which limits the unidirectional rotation of the spring sheet. The spring sheet and the ratchet hole contact and generate feedback when the push rod sleeve rotates.

[0022] In some embodiments, an elastic arm is provided at the proximal end of the push rod nut, and the elastic arm is used to support the medicine bottle container, and the elastic action of the elastic arm is used to achieve buffering of the medicine bottle container; a positioning groove is provided on the outer side of the push rod nut, and a positioning rib that cooperates with the positioning groove is provided on the inner side of the pen outer barrel to guide the push rod nut to be installed into the pen body and limit the circumferential position of the push rod nut; a mounting protrusion is provided at the distal end of the push rod nut, and the pen outer barrel is provided with a mounting hole that cooperates with the mounting protrusion to limit the axial position and circumferential position of the push rod nut.

[0023] In some embodiments, a first threaded body is provided on the outer side of the push rod, and the first threaded body cooperates with the push rod nut thread; a mounting head is provided at the proximal end of the push rod, and the mounting head is connected to the push rod buckle; a groove is provided on the outer side of the push rod for disconnecting the first threaded body along the axial direction of the push rod, and a limiting protrusion cooperating with the groove is provided on the inner side of the push rod sleeve to enable the push rod to be movable in the push rod sleeve and rotate under the restriction of the push rod sleeve.

[0024] In some embodiments, the push rod nut is located at the proximal end of the push rod sleeve, and a limiting portion is provided at the proximal end of the pen inner tube. The limiting portion is located on the side of the spring sheet away from the proximal end of the push rod sleeve, and the axial position of the push rod sleeve is limited by the push rod nut and the limiting portion.

[0025] In some embodiments, the adjustment mechanism also includes a limit nut, a groove is provided on the outer side of the limit nut, a first internal thread is provided on the inner side of the limit nut, and a limiting rib is provided on the inner side of the dose hub that cooperates with the groove to enable the limit nut to be movable on the dose hub and rotate under the restriction of the dose hub, and a first external thread is provided on the outer side of the clutch outer cylinder that cooperates with the first internal thread.

[0026] In some embodiments, a third threaded body is provided on the outer side of the dose hub, and a second threaded body threadably matched with the third threaded body is provided on the inner side of the pen outer barrel; the dose hub is provided with a logo printing, and the pen outer barrel is provided with a window, through which the logo printing is displayed; a notch is provided at the proximal end of the dose hub, and the notch is used to abut against the second threaded body to limit the maximum moving distance of the dose hub when it moves away from the pen body; a control spline is provided at the distal end of the dose hub, and the dose hub is rotated by the control spline.

[0027] In some embodiments, the pen body mechanism includes a refill frame, the refill frame is connected to the pen body, and the refill frame is used to install a medicine bottle container and a needle;

[0028] The injection pen also includes a pen cap, which is detachably connected to the pen core frame.

[0029] In some embodiments, a threaded interface is provided at the proximal end of the refill frame, and the threaded interface is used to install a needle; a buckle is provided at the distal end of the refill frame, and the outer barrel of the pen is provided with a window that cooperates with the buckle to limit the axial position and circumferential position of the refill frame; the refill frame is provided with a refill window, through which the position of the plug inside the medicine bottle container is observed; a positioning block is provided on the outer side of the refill frame, and the pen cap is provided with a cap groove that cooperates with the positioning block to limit the axial position of the pen cap.

[0030] Compared with the above-mentioned background technology, the feedback-optimized injection pen provided in the present application mainly includes a pen body mechanism, an adjustment mechanism and an injection mechanism; the pen body mechanism includes a pen body, the pen body has a pen outer tube and a pen inner tube, and the outer side of the pen inner tube is provided with a feedback rib; the adjustment mechanism includes a dosage hub, the outer side of the dosage hub is threadedly matched with the pen outer tube, and the dosage hub is provided with an elastic arm, and the elastic arm and the feedback rib are in contact to generate feedback when the dosage hub rotates; the injection mechanism and the adjustment mechanism have two states of coupling and decoupling. When the injection mechanism is coupled with the adjustment mechanism, the injection mechanism pushes the liquid in the medicine bottle container under the action of the adjustment mechanism.

[0031] Taking into account the defects of existing injection pens, especially the inaccurate dosage adjustment feedback and loose structure problems, this technical solution proposes a feedback-optimized injection pen, whose design focuses on strengthening the assembly relationship with the dosage hub through the inner and outer double-barrel structure of the pen body, and providing accurate adjustment feedback during the dosage adjustment process.

[0032] The pen body mechanism consists of an outer barrel and an inner barrel. This design realizes functional zoning and improves the stability of the overall structure. The outer barrel cooperates with the outer thread of the dose hub, limiting the dose hub to rotate and move according to the set path, ensuring the accuracy of dose adjustment. When the dose needs to be adjusted, the dose hub cooperates with the thread of the outer barrel to achieve backward rotation and movement adjustment, as well as forward rotation and movement feeding. Such mechanical cooperation reduces the assembly gap, thereby reducing the possibility of structural loosening.

[0033] At the same time, there is a feedback rib on the outside of the inner barrel of the pen, which contacts the elastic arm on the dose hub. During the rotation of the dose hub, the contact between the elastic arm and the feedback rib produces direct physical feedback. This feedback mechanism enables the operator to feel the subtle changes of each dose adjustment, improving the accuracy of dose setting. This feedback not only provides tactile feedback, but may also be accompanied by auditory feedback, enhancing the operator's perception of the dose adjustment process.

[0034] In addition, the injection mechanism and the adjustment mechanism can be in two states: coupling and decoupling. For example, when the dose hub is adjusted backward, the injection mechanism and the adjustment mechanism are decoupled, and the adjustment action of the adjustment mechanism will not affect the injection mechanism. When the dose hub is fed forward, the injection mechanism and the adjustment mechanism are coupled, and the adjustment mechanism drives the injection mechanism to achieve injection, and the injection amount of the injection mechanism is related to the adjustment amount of the adjustment mechanism. This design allows the injection mechanism to accurately push the liquid medicine in the medicine bottle container according to the dose set by the adjustment mechanism when coupled with the adjustment mechanism. This coupling and decoupling mechanism further ensures the accuracy and reliability of the injection process.

[0035] In combination with the above structure and process description, it can be seen that the feedback-optimized injection pen has at least the following beneficial effects: the feedback-optimized injection pen strengthens the assembly relationship with the dosage hub through the inner and outer double-barrel design of the pen body, and generates precise adjustment feedback through the contact between the elastic arm and the feedback rib position during the dosage adjustment process, thereby improving the accuracy of dosage setting and the reliability of the injection pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0037] FIG1 is a schematic diagram of a feedback-optimized injection pen provided in an embodiment of the present application;

[0038] FIG2 is an exploded view of the pen body mechanism in FIG1 ;

[0039] FIG3 is a cross-sectional view of a feedback-optimized injection pen provided in an embodiment of the present application;

[0040] FIG4 is a schematic diagram of a push rod nut provided in an embodiment of the present application;

[0041] FIG5 is a cross-sectional view of a push rod nut provided in an embodiment of the present application;

[0042] FIG6 is a schematic diagram of a push rod provided in an embodiment of the present application;

[0043] FIG7 is a schematic diagram of a push rod sleeve provided in an embodiment of the present application;

[0044] FIG8 is a full cross-sectional view of the pen body provided in an embodiment of the present application;

[0045] FIG9 is a half-section view of a pen body provided in an embodiment of the present application;

[0046] FIG10 is a schematic diagram of a dosage hub provided in an embodiment of the present application;

[0047] FIG11 is a full cross-sectional view of a dosage hub provided in an embodiment of the present application;

[0048] FIG12 is a schematic diagram of a pen cap provided in an embodiment of the present application;

[0049] FIG13 is a schematic diagram of a refill holder provided in an embodiment of the present application;

[0050] FIG14 is a schematic diagram of a push rod buckle provided in an embodiment of the present application;

[0051] FIG15 is a schematic diagram of a limiting nut provided in an embodiment of the present application;

[0052] FIG16 is a schematic diagram of a clutch provided in an embodiment of the present application;

[0053] FIG17 is a full cross-sectional view of a clutch provided in an embodiment of the present application;

[0054] FIG18 is a schematic diagram of an injection button provided in an embodiment of the present application;

[0055] FIG19 is an assembly diagram of a feedback-optimized injection pen provided in an embodiment of the present application;

[0056] FIG20 is a diagram showing the use of a feedback-optimized injection pen provided in an embodiment of the present application;

[0057] FIG21 is a first state diagram of the feedback optimized injection pen provided in an embodiment of the present application;

[0058] FIG22 is a second state diagram of the feedback optimized injection pen provided by an embodiment of the present application;

[0059] FIG23 is a diagram showing a third state of the feedback-optimized injection pen provided in an embodiment of the present application;

[0060] FIG. 24 is a fourth state diagram of the feedback-optimized injection pen provided in an embodiment of the present application.

[0061] in:

[0062] Pen body mechanism 100,

[0063] Push rod nut 3,

[0064] The mounting protrusion 31, the ratchet hole 32, the positioning groove 33, the connecting platform 34, the elastic arm 35, and the second internal thread 36;

[0065] Pen body 6,

[0066] Mounting hole 61, window 62, positioning rib 63, viewing window 64, pen inner barrel 65, limiting portion 66, second threaded body 67, feedback rib 68, pen outer barrel 69;

[0067] Pen cap 8,

[0068] Pen clip 81, cap slot 82, cap groove 83, main body 84;

[0069] Pencil holder 9,

[0070] Positioning block 91, buckle 92, refill window 93, threaded interface 94;

[0071] Adjustment mechanism 200,

[0072] Dosage hub 7,

[0073] The third threaded body 71, the elastic arm 72, the limiting rib 73, the coupling spline 74, the limiting groove 75, the control spline 76, the logo printing 77, and the notch 78;

[0074] Limit nut 11,

[0075] Groove 111, first internal thread 112;

[0076] Injection button 13,

[0077] A pressing portion 131 and a clamping joint 132;

[0078] Injection mechanism 300,

[0079] Putter 4,

[0080] A first threaded body 41, a mounting head 42, and a groove 43;

[0081] Push rod sleeve 5,

[0082] Spring piece 51, axial groove 52, limiting protrusion 53;

[0083] Push rod buckle 10,

[0084] A caliper portion 101 and a plane portion 102;

[0085] Clutch 12,

[0086] Limiting flange 121, barb 122, first external thread 123, axial rib 124, clutch inner tube 125, combining protrusion 126, clutch outer tube 127;

[0087] Medicine bottle container 1, rubber stopper 2. DETAILED DESCRIPTION

[0088] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0089] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0090] Please refer to Figures 1 to 3, wherein Figure 1 is a schematic diagram of a feedback-optimized injection pen provided in an embodiment of the present application, Figure 2 is a disassembled diagram of the pen body mechanism in Figure 1, and Figure 3 is a cross-sectional view of the feedback-optimized injection pen provided in an embodiment of the present application.

[0091] In a first specific implementation, the feedback-optimized injection pen provided in the implementation scheme of the present application mainly includes a pen body mechanism 100 , an adjustment mechanism 200 and an injection mechanism 300 .

[0092] The pen body mechanism 100 is an injection pen mechanism for installing and carrying the adjustment mechanism 200 and the injection mechanism 300. The adjustment mechanism 200 is used to adjust the dosage, and the injection mechanism 300 is used to inject the set dosage of the liquid medicine. The adjustment function of the adjustment mechanism 200 is achieved through the movement distance of its components, and the injection function of the injection mechanism 300 is achieved through the movement distance of its components related to the movement distance of the components of the adjustment mechanism 200.

[0093] The pen body mechanism 100 includes a pen body 6, which has an outer pen tube 69 and an inner pen tube 65. The outer pen tube 69 is located outside the inner pen tube 65, and the inner pen tube 65 is nested inside the outer pen tube 69. In addition to the necessary structural connection, there is a distance between the two. In particular, a feedback rib 68 is provided on the outer side of the inner pen tube 65.

[0094] The adjustment mechanism 200 includes a dose hub 7, the outer side of which is threadedly matched with the pen outer tube 69, and the dose hub 7 is provided with an elastic arm 72, and the elastic arm 72 and the feedback rib 68 contact and generate feedback when the dose hub 7 rotates. When adjusting the dose, the dose hub 7 is rotated to move the dose hub 7 toward the distal end of the injection pen, and at this time, the elastic arm 72 and the feedback rib 68 indirectly contact and generate feedback, and the feedback sense includes but is not limited to the sense of touch and the sense of hearing, and this kind of feedback sense is related to the adjustment amount of the adjustment mechanism 200, so the feedback is adjusted at this time.

[0095] The injection mechanism 300 and the adjustment mechanism 200 have two states: coupling and decoupling. When the injection mechanism 300 is coupled with the adjustment mechanism 200, the injection mechanism 300 pushes the liquid medicine in the medicine bottle container 1 under the action of the adjustment mechanism 200. This means that when the adjustment mechanism 200 performs dosage adjustment, the injection mechanism 300 and the adjustment mechanism 200 are in a decoupled state, and the injection mechanism 300 will not be affected by the adjustment mechanism 200 and cause erroneous injection. Only when the injection mechanism 300 and the adjustment mechanism 200 are coupled, the injection mechanism 300 will generate an injection operation, and the injection amount of the injection mechanism 300 is related to the adjustment amount of the adjustment mechanism 200.

[0096] Based on the above scheme, and taking into account the defects of existing injection pens, especially the inaccurate dosage adjustment feedback and loose structure problems, the present technical scheme proposes a feedback-optimized injection pen, the design focus of which is to strengthen the assembly relationship with the dosage hub 7 through the inner and outer double-barrel structure of the pen body 6, and to provide accurate adjustment feedback during the dosage adjustment process.

[0097] The pen body mechanism 100 is composed of a pen outer barrel 69 and a pen inner barrel 65. This design realizes functional zoning and improves the stability of the overall structure. The pen outer barrel 69 cooperates with the outer thread of the dose hub 7, limiting the dose hub 7 to rotate and move according to the set path, ensuring the accuracy of dose adjustment. When the dose needs to be adjusted, the dose hub 7 cooperates with the thread of the pen outer barrel 69 to achieve backward rotation and movement adjustment, as well as forward rotation and movement feeding. Such mechanical cooperation reduces the assembly gap, thereby reducing the possibility of structural looseness.

[0098] At the same time, a feedback rib 68 is provided on the outer side of the pen inner tube 65, which contacts the elastic arm 72 on the dose hub 7. During the rotation of the dose hub 7, the contact between the elastic arm 72 and the feedback rib 68 generates direct physical feedback. This feedback mechanism enables the operator to feel the subtle changes of each dose adjustment, thereby improving the accuracy of dose setting. This feedback not only provides tactile feedback, but may also be accompanied by auditory feedback, thereby enhancing the operator's perception of the dose adjustment process.

[0099] In addition, the injection mechanism 300 and the adjustment mechanism 200 can be in two states: coupling and decoupling. For example, when the dosage hub 7 is adjusted backward, the injection mechanism 300 is decoupled from the adjustment mechanism 200, and the adjustment action of the adjustment mechanism 200 will not affect the injection mechanism 300. When the dosage hub 7 is fed forward, the injection mechanism 300 is coupled with the adjustment mechanism 200, and the adjustment mechanism 200 drives the injection mechanism 300 to achieve injection, and the injection amount of the injection mechanism 300 is related to the adjustment amount of the adjustment mechanism 200. This design allows the injection mechanism 300 to accurately push the liquid medicine in the medicine bottle container 1 according to the dose set by the adjustment mechanism 200 when coupled with the adjustment mechanism 200. This coupling and decoupling mechanism further ensures the accuracy and reliability of the injection process.

[0100] In combination with the above structure and process description, it can be seen that the feedback-optimized injection pen has at least the following beneficial effects: the feedback-optimized injection pen strengthens the assembly relationship with the dosage hub 7 through the inner and outer double-barrel design of the pen body 6, and generates precise adjustment feedback through the contact between the elastic arm 72 and the feedback rib position 68 during the dosage adjustment process, thereby improving the accuracy of dosage setting and the reliability of the injection pen.

[0101] It should be noted that the proximal end in this article refers to the side close to the needle and the injection site, that is, the head end of the feedback-optimized injection pen, and the distal end refers to the side opposite to the proximal end, that is, the tail end of the feedback-optimized injection pen. Based on this, each component has its proximal end and distal end, and the proximal ends and distal ends of different components follow the same definition rules.

[0102] In some embodiments, the elastic arm 72 is used to be deformed by the injection mechanism 300 to separate from the feedback rib 68 when the injection mechanism 300 is coupled with the adjustment mechanism 200; when the injection mechanism 300 is decoupled from the adjustment mechanism 200, the elastic arm 72 maintains contact with the feedback rib 68.

[0103] In this embodiment, when the injection mechanism 300 and the adjustment mechanism 200 are in a decoupled state, it means that the adjustment operation of the adjustment mechanism 200 is performed, rather than the injection operation of the injection mechanism 300. At this time, the elastic arm 72 keeps in contact with the feedback rib 68. This arrangement allows the elastic arm 72 to generate feedback normally when the dose hub 7 rotates to adjust the dose. This feedback may include sound or other sensory signals to help the user obtain an intuitive perception of dose changes when adjusting the dose.

[0104] On the contrary, when the injection mechanism 300 is coupled with the adjustment mechanism 200, it means that the injection operation of the injection mechanism 300 is performed instead of the adjustment operation of the adjustment mechanism 200. In this case, the elastic arm 72 is pushed by the injection mechanism 300 to be deformed and separated from the feedback rib 68. This separation ensures that unnecessary feedback will not be generated due to the contact between the elastic arm 72 and the feedback rib 68 during the injection process, thereby avoiding interference in the injection operation.

[0105] Therefore, the design of the elastic arm 72 ensures that its feedback function only works when adjusting the dosage and is canceled during the injection operation. This design improves the operation accuracy and user experience of the injection pen, allowing the user to get clear feedback when adjusting the dosage and avoid unnecessary interference during injection; because the elastic arm 72 can play a clutch role, the use of metal parts such as springs is avoided, reducing manufacturing costs.

[0106] In some embodiments, the injection mechanism 300 includes:

[0107] The clutch 12 is arranged inside the dosage hub 7. The clutch 12 can rotate and move. The clutch 12 is connected to an injection button 13 located at the distal end of the pen body mechanism 100. The clutch 12 and the dosage hub 7 have two states of coupling and decoupling at different moving positions of the clutch 12.

[0108] The push rod sleeve 5 is arranged inside the clutch 12, and the push rod sleeve 5 rotates under the restriction of the clutch 12;

[0109] The push rod 4 is arranged inside the push rod sleeve 5. The push rod 4 can move and rotate under the restriction of the push rod sleeve 5. The push rod 4 is threadedly matched with the pen body mechanism 100. The proximal end of the push rod 4 is provided with a push rod buckle 10, which is used to push the rubber stopper 2 of the medicine bottle container 1.

[0110] Regarding the push rod 4, please refer to FIG. 6, which is a schematic diagram of the push rod provided in an embodiment of the present application.

[0111] Regarding the push rod sleeve 5, please refer to FIG. 7, which is a schematic diagram of the push rod sleeve provided in an embodiment of the present application.

[0112] Regarding the clutch 12, please refer to Figures 16 and 17. Figure 16 is a schematic diagram of the clutch provided in an embodiment of the present application, and Figure 17 is a full cross-sectional view of the clutch provided in an embodiment of the present application.

[0113] In this embodiment, the key to the design of the injection mechanism 300 lies in its interaction with the dosage hub 7, and how to accurately control the injection of the liquid medicine through this interaction. The clutch 12, as the core component of the injection mechanism 300, is arranged inside the dosage hub 7, and it can not only rotate, but also move within a certain range. This design enables the clutch 12 to be coupled or decoupled with the dosage hub 7 at different positions, thereby controlling the action of the injection mechanism 300.

[0114] The push rod sleeve 5 is arranged inside the clutch 12, and it can also rotate under the restriction of the clutch 12. This structure allows the push rod sleeve 5 to perform precise position adjustment under the control of the clutch 12, providing stable support and guidance for the injection mechanism 300.

[0115] The push rod 4 is located inside the push rod sleeve 5, and it can also move and rotate under the restriction of the push rod sleeve 5. The push rod 4 is connected to the pen body mechanism 100 through a threaded connection, which not only provides a stable connection, but also allows the push rod 4 to move accurately in the axial direction. The proximal end of the push rod 4 is provided with a push rod buckle 10, which is the part that directly contacts the rubber plug 2 of the medicine bottle container 1 and is used to push the rubber plug 2 during injection, thereby controlling the injection of the liquid medicine.

[0116] When in use, in order to couple the injection mechanism 300 with the adjustment mechanism 200, the clutch 12 moves to the coupling position with the dosage hub 7, the clutch 12 is coupled with the dosage hub 7, and the two will maintain synchronous rotation; at this time, the clutch 12 continues to be moved, the dosage hub 7 will move and rotate at the same time under the restriction of the pen outer tube 69, and the clutch 12 rotates; at the same time, the push rod sleeve 5 rotates synchronously under the restriction of the clutch 12, and the push rod 4 rotates synchronously under the restriction of the push rod sleeve 5; due to the threaded cooperation between the push rod 4 and the pen body mechanism 100, the rotating push rod 4 moves, and the push rod buckle 10 at the proximal end of the push rod 4 moves toward the proximal end of the injection pen, and the injection of the liquid medicine is achieved by pushing the rubber stopper 2 of the medicine bottle container 1.

[0117] When the above-mentioned injection operation is not performed, the injection mechanism 300 is decoupled from the adjustment mechanism 200, and the clutch 12 is in a decoupled position in a natural state. The clutch 12 will not be moved due to the movement of the dosage hub 7, so the dosage hub 7 can be rotated independently, and the adjustment operation is achieved through the adjustment mechanism 200; after the adjustment operation is completed, by controlling the injection mechanism 300 to couple with the adjustment mechanism 200, the injection mechanism 300 will be associated with the movement of the adjustment mechanism 200, and the adjustment amount of the adjustment mechanism 200 can be reflected on the injection amount of the injection mechanism 300.

[0118] It should be noted that in the adjustment operation and the injection operation, the movement direction of the adjustment mechanism 200 is generally opposite. For example, in the adjustment operation, the adjustment mechanism 200 moves toward the distal end, and the adjustment amount will be reflected by the moving distance between the adjustment mechanism 200 and the proximal end after the adjustment mechanism 200 moves toward the distal end. In the injection operation, the adjustment mechanism 200 moves toward the proximal end, and the injection mechanism 300 moves toward the proximal end under the action of the adjustment mechanism 200, and the injection amount is related to the adjustment amount.

[0119] Please continue to refer to Figure 6. In some cases, the structure of the push rod 4 includes a first threaded body 41, a mounting head 42, and a groove 43. The first threaded body 41 engages with the second internal thread 36 in the middle of the push rod nut 3 to control the axial displacement of the push rod 4 after passing through the push rod nut 3. The mounting head 42 at the proximal end engages with the caliper-shaped caliper portion 101 of the push rod buckle 10 to fix the push rod buckle 10 at the axial position of the proximal end of the push rod 4. The groove 43 disconnects the first threaded body 41 and engages with the radial limiting protrusion 53 on the proximal inner side of the push rod sleeve 5 to control the push rod 4 to always rotate synchronously with the push rod sleeve 5 and to move freely axially in the push rod sleeve 5.

[0120] Please continue to refer to FIG. 7. In some cases, the structure of the push rod sleeve 5 includes a spring piece 51, an axial groove 52, and a limiting protrusion 53. The proximal symmetrical one-way spring piece 51 is engaged with the central radial ratchet hole 32 of the push rod nut 3 to limit the push rod nut 3 to rotate in a fixed direction, and emits an injection prompt sound through indirect contact with the central radial ratchet hole 32. The symmetrical axial groove 52 extending from the middle section to the distal end on the inner side is engaged with the two symmetrical axial ribs 124 on the outer side of the clutch inner cylinder 125 of the clutch 12 to limit the push rod sleeve 5 from rotating synchronously with the clutch 12 and from axial displacement in the clutch 12. The proximal inner radial limiting protrusion 53 is engaged with the groove 43 of the first threaded body 41 of the push rod 4 to control the push rod sleeve 5 to always rotate synchronously with the push rod 4 and to move freely axially on the push rod 4. In addition, the proximal axial position of the push rod sleeve 5 is close to the push rod nut 3, and the distal axial position is limited by the proximal limit portion 66 of the pen body 6, so that the axial position of the push rod sleeve 5 is determined, while allowing the push rod sleeve 5 to rotate, the axial movement of the push rod sleeve 5 is avoided.

[0121] Please continue to refer to Figures 16 and 17. In some cases, the structure of the clutch 12 includes a limit flange 121, a barb 122, a first external thread 123, an axial rib 124, a clutch inner cylinder 125, a coupling protrusion 126, and a clutch outer cylinder 127. The clutch 12 is limited to an axial position inside the dose hub 7 by the proximal symmetrical elastic arm 72 of the dose hub 7 and the radial limit groove 75 on the distal inner side of the dose hub 7 being engaged with the distal limit flange 121 of the clutch 12. The distal elastic barb 122 is engaged with the proximal axial protruding clamping joint 132 of the button 13 to combine and fix the relative axial position of the injection button 13 and the clutch 12, and allow the two parts to rotate. The first external thread 123 is engaged with the inner first internal thread 112 of the limit nut 11 to control the limit nut 11 to always perform a specific axial displacement and rotation according to the first external thread 123 of the clutch 12. The two symmetrical axial ribs 124 on the outer side of the clutch inner tube 125 are engaged with the symmetrical axial grooves 52 extending from the middle section to the distal end on the inner side of the push rod sleeve 5, so as to limit the push rod sleeve 5 from being able to rotate synchronously with the clutch 12 and to be able to make axial displacement in the clutch 12. When the clutch 12 is in a position biased toward the proximal end in the dosing hub 7, the distal symmetrical longitudinal engaging protrusions 126 and the longitudinal engaging splines 74 on the inner side of the distal end of the dosing hub 7 are engaged with each other to achieve radial engagement of the two parts, so as to realize the function of synchronous rotation with the dosing hub 7.

[0122] Please refer to FIG. 18, which is a schematic diagram of an injection button provided in an embodiment of the present application. In some cases, the structure of the injection button 13 includes a pressing portion 131 and a clamping joint 132. The distal pressing portion 131 provides a better tactile feeling when the user presses. The proximal axial protruding clamping joint 132 engages with the distal elastic barb 122 of the clutch 12 to combine and fix the relative axial position of the injection button 13 and the clutch 12 and allow the two parts to rotate relative to each other. In addition, part of the outer radial area of ​​the injection button 13 is shielded by the internal space of the distal radial control spline 76 of the dose hub 7.

[0123] In some embodiments, the clutch 12 comprises a clutch outer cylinder 127 and a clutch inner cylinder 125 , and a push rod sleeve 5 is disposed between the clutch outer cylinder 127 and the clutch inner cylinder 125 .

[0124] In this embodiment, the design of the clutch 12 includes two main parts: a clutch outer cylinder 127 and a clutch inner cylinder 125. These two parts together constitute the basic structure of the clutch 12, and a space is formed between them, which is used to accommodate the push rod sleeve 5. The push rod sleeve 5 is located between the clutch outer cylinder 127 and the clutch inner cylinder 125. Such a layout allows the push rod sleeve 5 to move freely inside the clutch 12 while being restricted and controlled by the clutch 12.

[0125] The design of the clutch outer cylinder 127 and the clutch inner cylinder 125 allows the push rod sleeve 5 to move axially and rotate inside the clutch 12, which is the key to realizing the function of the injection mechanism 300. This structural design of the clutch 12 ensures that the push rod sleeve 5 can work in coordination with other components of the injection mechanism 300 under the precise control of the clutch 12 to achieve precise injection of the liquid medicine.

[0126] In some embodiments, an axial rib 124 is disposed on the outer side of the clutch inner tube 125 , and an axial groove 52 cooperating with the axial rib 124 is disposed on the inner side of the push rod sleeve 5 to enable the push rod sleeve 5 to rotate under the restriction of the clutch 12 .

[0127] In this embodiment, the design of the clutch 12 is further refined, with particular attention paid to the interaction between the clutch inner cylinder 125 and the push rod sleeve 5. The outer side of the clutch inner cylinder 125 is designed with axial ribs 124, which are key features in the structure of the clutch 12 and match the inner side of the push rod sleeve 5. The inner side of the push rod sleeve 5 is designed with axial grooves 52, which precisely match the axial ribs 124, allowing the push rod sleeve 5 to rotate synchronously under the control of the clutch 12.

[0128] The cooperation of the axial ribs 124 and the axial grooves 52 not only ensures the stability of the push rod sleeve 5 in the clutch 12, but also provides a mechanism to enable the push rod sleeve 5 to rotate accurately under the restriction of the clutch 12. This design allows the push rod sleeve 5 to rotate synchronously with the clutch 12 when necessary while maintaining its correct position and direction, which is crucial to the function of the injection mechanism 300.

[0129] In some embodiments, a coupling protrusion 126 is provided at the distal end of the clutch 12. Specifically, the coupling protrusion 126 is provided at the distal end of the clutch outer cylinder 127. A coupling spline 74 is provided at the distal end of the dosage hub 7. The coupling protrusion 126 and the coupling spline 74 have two states of coupling and decoupling at different moving positions of the clutch 12.

[0130] When the clutch 12 moves toward the proximal end of the dosage hub 7, the coupling protrusion 126 couples with the coupling spline 74, and the dosage hub 7 moves toward the proximal end of the pen body 6 driven by the clutch 12; when the coupling protrusion 126 decouples from the coupling spline 74, the clutch 12 moves toward the distal end of the pen body 6 driven by the dosage hub 7.

[0131] In this embodiment, the outer cylinder part of the clutch 12, i.e., the clutch outer cylinder 127, is designed with a coupling protrusion 126 at its distal end. This protrusion is a key structure for realizing the mechanical connection between the clutch 12 and the dosage hub 7. Accordingly, the distal end of the dosage hub 7 is designed with a coupling spline 74, which is a structure that cooperates with the coupling protrusion 126, allowing coupling or decoupling with the coupling protrusion 126 to be realized in different operation stages.

[0132] The interaction between the coupling protrusion 126 and the coupling spline 74 determines the coupling state between the clutch 12 and the dosage hub 7. When the clutch 12 needs to be coupled with the dosage hub 7, the clutch 12 moves toward the proximal end of the dosage hub 7, so that the coupling protrusion 126 and the coupling spline 74 are meshed with each other to form a stable mechanical connection, so that the dosage hub 7 moves toward the proximal end of the pen body 6 under the drive of the clutch 12, and the movement of the dosage hub 7 includes movement and rotation. This coupling state ensures that the rotation of the dosage hub 7 can be transmitted to the clutch 12, thereby affecting the movement of the push rod sleeve 5 and the push rod 4, and achieving accurate dosage injection.

[0133] On the contrary, when the clutch 12 needs to be decoupled from the dosage hub 7, the coupling protrusion 126 is separated from the coupling spline 74, so that the rotation of the dosage hub 7 no longer affects the action of the clutch 12 and the injection mechanism 300. At this time, the clutch 12 moves toward the distal end of the pen body 6 driven by the dosage hub 7. The movement of the clutch 12 only includes movement, and the clutch 12 does not rotate. This design allows unnecessary injection actions to be avoided when adjusting the dosage, thereby improving the safety of the injection pen and the flexibility of operation.

[0134] In some embodiments, the elastic arm 72 is disposed at the proximal end of the dosage hub 7 , and a limiting groove 75 is disposed at the distal end of the dosage hub 7 . The moving position of the clutch 12 is limited by the elastic arm 72 and the limiting groove 75 .

[0135] In particular, when the clutch 12 is coupled to the dose hub 7, the proximal end of the clutch 12 pushes the elastic arm 72, and the elastic arm 72 is separated from the feedback rib position 68, so that the elastic arm 72 is deformed by the injection mechanism 300 to separate from the feedback rib position 68; when the clutch 12 is decoupled from the dose hub 7, the elastic arm 72 maintains contact with the feedback rib position 68.

[0136] In this embodiment, the design of the dose hub 7 includes two key parts: an elastic arm 72 and a limiting groove 75. The elastic arm 72 is located at the proximal end of the dose hub 7, and the limiting groove 75 is located at the distal end of the dose hub 7. These two parts together determine the moving position of the clutch 12. In other words, the clutch 12 moves between the elastic arm 72 and the limiting groove 75.

[0137] The main function of the elastic arm 72 is to provide feedback during the adjustment operation. When adjusting the dose, the clutch 12 and the dose hub 7 are in a decoupled state, at which time the elastic arm 72 is not restricted by the clutch 12 and can maintain contact with the feedback rib 68 of the pen body mechanism 100. This contact allows the elastic arm 72 to generate feedback, such as touch and sound, when the dose hub 7 rotates, providing the operator with an intuitive perception of dose adjustment.

[0138] On the contrary, during the injection operation, the clutch 12 is coupled to the dosage hub 7, and the proximal end of the clutch 12 pushes the elastic arm 72, causing the elastic arm 72 to separate from the feedback rib 68. This separation ensures that the elastic arm 72 will not contact the feedback rib 68 during the injection process, avoiding unnecessary sound or tactile feedback during the injection, thereby reducing interference during the injection operation.

[0139] Therefore, the design of the elastic arm 72 allows the injection pen to provide clear feedback when adjusting the dosage, but no feedback when injecting the liquid medicine, thereby improving the operation convenience and accuracy of the injection pen. This design cleverly distinguishes between the two operations of adjustment and injection, ensuring the user experience and operation accuracy of the injection pen at different operation stages.

[0140] In some embodiments, a spring sheet 51 is disposed on the outer side of the push rod sleeve 5 , and the spring sheet 51 contacts the pen body mechanism 100 to generate feedback when the push rod sleeve 5 rotates.

[0141] In this embodiment, the design of the push rod sleeve 5 adds an important functional component, namely, a spring 51. This spring 51 is located on the outside of the push rod sleeve 5, and its function is to provide feedback during the injection process. When the injection mechanism 300 is coupled with the adjustment mechanism 200, and the push rod sleeve 5 rotates accordingly, the spring 51 contacts the pen body mechanism 100, generating injection feedback. This feedback mechanism enables the operator to feel the movement of the push rod sleeve 5 when injecting the liquid medicine, thereby providing intuitive feedback of the injection operation.

[0142] Different from the feedback generated by the spring arm 72 when adjusting the dose, the feedback of the spring piece 51 is specifically for the injection operation. In the dose adjustment stage, the contact between the spring arm 72 and the feedback rib 68 provides feedback for the dose adjustment, so that the operator can feel the dose adjustment. In the injection stage, the addition of the spring piece 51 ensures that the operator can obtain confirmation of the injection operation. This dual-position feedback mechanism enhances the interactivity of the injection pen and the accuracy of operation.

[0143] Therefore, the design of the spring 51 enables the injection pen to provide direct feedback when injecting the drug solution, which not only improves the accuracy of the operation, but also enhances the operator's sense of control over the injection process. This design enables the injection pen to provide appropriate feedback in different operation stages - adjustment and injection - to ensure the smoothness and reliability of the entire injection process.

[0144] In some embodiments, the pen body mechanism 100 includes a push rod nut 3, which is connected to the pen body 6. A push rod 4 is passed through the push rod nut 3 and threadedly engaged with the push rod 4. The push rod nut 3 is provided with a ratchet hole 32. The ratchet hole 32 limits the unidirectional rotation of the spring piece 51. The spring piece 51 and the ratchet hole 32 contact to generate feedback when the push rod sleeve 5 rotates.

[0145] Regarding the push rod nut 3, please refer to Figures 4 and 5. Figure 4 is a schematic diagram of the push rod nut provided in an embodiment of the present application, and Figure 5 is a cross-sectional view of the push rod nut provided in an embodiment of the present application.

[0146] In this embodiment, the design of the pen body mechanism 100 is further refined, especially the function and structure of the push rod nut 3. The push rod nut 3 is a key component connected to the pen body 6. It is not only fixed to the pen body 6, but also penetrates the push rod 4 and is connected to the push rod 4 through a threaded fit. This threaded fit allows the push rod 4 to move accurately inside the push rod nut 3, which is crucial for controlling the axial position of the push rod 4.

[0147] The push rod nut 3 is provided with a ratchet hole 32, which is a specially designed hole with ratchet teeth on its inner wall. The main function of the ratchet hole 32 is to limit the rotation direction of the spring 51 so that the spring 51 can only rotate in one direction, preventing the spring 51 from rotating in the opposite direction when the injection pen is adjusted. This one-way rotation restriction is very important for controlling the rotation of the push rod sleeve 5 and the movement of the push rod 4, because it can ensure that the movement of the push rod 4 during the injection process is controlled and accurately corresponds to the dose set by the dose hub 7.

[0148] When the push rod sleeve 5 rotates, the spring piece 51 contacts the ratchet hole 32 to generate feedback. This feedback is provided during the injection operation, which enables the operator to feel the movement of the push rod sleeve 5, thereby obtaining intuitive feedback of the injection operation. This feedback mechanism not only improves the accuracy of the injection process, but also enhances the operator's sense of control over the injection pen and the safety of the operation.

[0149] Please continue to refer to Figures 4 and 5. In some cases, the structure of the push rod nut 3 includes a mounting protrusion 31, a ratchet hole 32, a positioning groove 33, a connecting platform 34, an elastic arm 35, and a second internal thread 36. The four symmetrical mounting protrusions 31 at the distal end are engaged with the four mounting holes 61 at the distal side of the pen body 6 to fix the axial position and circumferential position of the push rod nut 3 in the pen body 6. The central radial ratchet hole 32 is a one-way tooth, which is engaged with the proximal symmetrical one-way spring 51 of the push rod sleeve 5 to limit the push rod sleeve 5 to rotate in a fixed direction in the push rod nut 3, and to emit an injection prompt sound through indirect contact with the spring 51. The lateral symmetrical positioning groove 33 is engaged with the proximal inner positioning rib 63 of the pen body 6 to provide guidance during assembly and limit the radial position of the push rod nut 3 in the pen body 6. An elastic arm 35 is set at the proximal end of the connecting platform 34. The proximal symmetrical elastic arm 35 is used to resist the axial position of one end of the medicine bottle container 1. The middle second internal thread 36 is engaged with the first threaded body 41 of the push rod 4 to control the axial displacement generated by the rotation of the push rod 4.

[0150] In some embodiments, a resilient arm 35 is provided at the proximal end of the push rod nut 3, and the resilient arm 35 is used to support the medicine bottle container 1, and the elastic action of the resilient arm 35 is used to achieve buffering of the medicine bottle container 1; a positioning groove 33 is provided at the outer side of the push rod nut 3, and a positioning rib 63 cooperating with the positioning groove 33 is provided at the inner side of the pen outer barrel 69 to guide the push rod nut 3 to be installed into the pen body 6 and limit the circumferential position of the push rod nut 3; a mounting protrusion 31 is provided at the distal end of the push rod nut 3, and a mounting hole 61 cooperating with the mounting protrusion 31 is provided at the pen outer barrel 69 to limit the axial position and circumferential position of the push rod nut 3.

[0151] In this embodiment, the design details of the push rod nut 3 are further clarified to ensure its function and positioning in the injection pen. The proximal end of the push rod nut 3 is equipped with an elastic arm 35, which directly contacts the medicine bottle container 1 to provide a stable support for the medicine bottle container 1 and provide a buffering effect at the distal end of the medicine bottle container 1. This design helps to keep the medicine bottle container 1 stable during the injection process and prevent it from moving or rotating under the action of force, thereby ensuring the accuracy and consistency of the injection of the liquid medicine.

[0152] The outer side of the push rod nut 3 is designed with a positioning groove 33, which matches with the positioning rib 63 on the inner side of the pen outer barrel 69. This matching relationship not only guides the push rod nut 3 to be correctly installed into the pen body 6, but also effectively limits the rotation of the push rod nut 3 around the pen body 6, that is, limits its circumferential position. This precise positioning is crucial to ensure that the push rod nut 3 and the associated push rod 4 can operate smoothly and accurately.

[0153] Furthermore, a mounting protrusion 31 is designed at the distal end of the push rod nut 3, and the protrusion matches with the mounting hole 61 on the pen outer barrel 69. This matching relationship limits the axial movement of the push rod nut 3 along the pen body 6, that is, limits its axial position. Such a design ensures that the push rod nut 3 has a fixed position in the pen body 6, providing necessary structural support for the stable operation of the push rod 4.

[0154] In some embodiments, a first threaded body 41 is provided on the outer side of the push rod 4, and the first threaded body 41 is threadedly matched with the push rod nut 3; a mounting head 42 is provided at the proximal end of the push rod 4, and the mounting head 42 is connected to the push rod buckle 10; a groove 43 is provided on the outer side of the push rod 4 to disconnect the first threaded body 41 along the axial direction of the push rod 4, and a limiting protrusion 53 matching with the groove 43 is provided on the inner side of the push rod sleeve 5 to realize the push rod 4 to be movable in the push rod sleeve 5 and rotate under the restriction of the push rod sleeve 5.

[0155] In this embodiment, the outer side of the push rod 4 is designed with a first threaded body 41, and this threaded structure enables it to be threadedly matched with the push rod nut 3. This match allows the push rod 4 to perform precise linear movement inside the push rod nut 3, respond to the dose set by the adjustment mechanism 200, and achieve injection of the drug solution.

[0156] The proximal end of the push rod 4 is designed with a mounting head 42, which is connected to the push rod buckle 10. The push rod buckle 10 is used to directly contact the rubber plug 2 of the medicine bottle container 1 and push the rubber plug 2 during the injection process, thereby controlling the injection of the liquid medicine. The mounting head 42 provides a stable connection point to ensure that the push rod 4 can transmit sufficient force when pushing the rubber plug 2 of the medicine bottle container 1.

[0157] In addition, the outer side of the push rod 4 is provided with a groove 43 along its axial direction, and the groove 43 disconnects the first threaded body 41. The inner side of the push rod sleeve 5 is designed with a limiting protrusion 53 that cooperates with the groove 43. This design allows the push rod 4 to move freely inside the push rod sleeve 5 and rotate under the restriction of the push rod sleeve 5. The cooperation between the limiting protrusion 53 and the groove 43 ensures the stability and controllability of the push rod 4 during movement, and prevents the push rod 4 from improperly moving or rotating inside the push rod sleeve 5, which is crucial for accurately controlling the injection dose.

[0158] Please refer to FIG. 14, which is a schematic diagram of a push rod buckle provided in an embodiment of the present application. In some cases, the push rod buckle 10 has a caliper portion 101 and a flat portion 102. The caliper-shaped caliper portion 101 engages with the mounting heads 42 on both sides of the push rod 4 to fix the push rod buckle 10 at the axial position of the end of the push rod 4. The proximal flat portion 102 is used to be close to the rubber plug 2 of the medicine bottle container as a contact surface for the injection pen to push the rubber plug 2.

[0159] In some embodiments, the push rod nut 3 is located at the proximal end of the push rod sleeve 5, and a limiting portion 66 is provided at the proximal end of the pen inner tube 65. The limiting portion 66 is located on the side of the spring piece 51 away from the proximal end of the push rod sleeve 5, and the axial position of the push rod sleeve 5 is limited by the push rod nut 3 and the limiting portion 66.

[0160] In this embodiment, the layout of the push rod nut 3 plays a key role in limiting the axial position of the push rod sleeve 5. The push rod nut 3 is arranged at the proximal end of the push rod sleeve 5 and cooperates with the limiting portion 66 at the proximal end of the pen inner barrel 65. This layout forms two limiting points of the axial position of the push rod sleeve 5.

[0161] The push rod nut 3 serves as a fixed point, limiting the movement of the push rod sleeve 5 toward the proximal end of the pen body 6. This point is located in the first side direction of the spring sheet 51, which is equivalent to the push rod sleeve 5 being axially positioned at the proximal side of the spring sheet 51 through the action of the push rod nut 3 on the proximal end of the push rod sleeve 5; and the limiting portion 66 is located in the second side direction of the spring sheet 51, which is equivalent to the push rod sleeve 5 being axially positioned at the distal side of the spring sheet 51 through the action of the limiting portion 66 on the distal surface of the spring sheet 51. In this way, the push rod sleeve 5 is firmly fixed in the pen body 6, and its axial movement is effectively controlled, ensuring the stability and accuracy of the injection mechanism 300 during operation.

[0162] In addition, this structural design also helps to provide uniform force distribution during the injection process, reducing the injection error of the liquid medicine caused by abnormal movement of the push rod sleeve 5. The use of the push rod nut 3 and the limiter 66 improves the rigidity and reliability of the entire injection system, ensuring the precise adjustment and injection of the injection dose.

[0163] In some embodiments, the adjustment mechanism 200 also includes a limit nut 11, a groove 111 is provided on the outer side of the limit nut 11, a first internal thread 112 is provided on the inner side of the limit nut 11, and a limiting rib 73 is provided on the inner side of the dose hub 7 to cooperate with the groove 111, so as to realize that the limit nut 11 can be moved on the dose hub 7 and rotated under the restriction of the dose hub 7, and a first external thread 123 is provided on the outer side of the clutch outer cylinder 127 to threadably cooperate with the first internal thread 112.

[0164] Regarding the limiting nut 11, please refer to Figure 15, which is a schematic diagram of the limiting nut provided in an embodiment of the present application.

[0165] In this embodiment, the composition of the adjustment mechanism 200 is further extended to include a limit nut 11, which is a key component for accurately controlling the movement and rotation of the dose hub 7. A groove 111 is designed on the outer side of the limit nut 11, and this structure allows certain parts on the dose hub 7 to cooperate with the limit nut 11, thereby realizing the movement of the limit nut 11 on the dose hub 7.

[0166] The inner side of the limiting nut 11 is designed with a first internal thread 112, which cooperates with the limiting rib 73 on the inner side of the dose hub 7. This matching relationship enables the limiting nut 11 to move freely on the dose hub 7 and rotate under the restriction of the dose hub 7. This design allows the limiting nut 11 to move along the thread of the dose hub 7 when adjusting the dose to adjust the desired dose setting.

[0167] In addition, the outer side of the clutch outer cylinder 127 is provided with a first outer thread 123, which cooperates with the first inner thread 112 of the limiting nut 11. This thread cooperation not only provides an additional fixing point for the limiting nut 11, but also allows precise mechanical cooperation between the clutch outer cylinder 127 and the limiting nut 11. This cooperation relationship is crucial to ensure the stability and accuracy of the injection pen during dose adjustment and injection.

[0168] Please continue to refer to Figure 15. In some cases, the structure of the limit nut 11 includes a groove 111 and a first internal thread 112. The outer symmetrical groove 111 is engaged with the inner symmetrical position 73 of the dosage hub 7 to ensure that the two parts can only perform synchronous radial rotation and the limit nut 11 can only perform axial movement along the limit rib position 73. The inner first internal thread 112 is engaged with the first external thread 123 of the clutch 12 to control the limit nut 11 to always perform specific axial displacement and rotation according to the thread 123 of the clutch 12.

[0169] In some embodiments, a third threaded body 71 is provided on the outer side of the dose hub 7, and a second threaded body 67 threadably matched with the third threaded body 71 is provided on the inner side of the pen outer barrel 69; the dose hub 7 is provided with a logo print 77, and the pen outer barrel 69 is provided with a window 64, through which the logo print 77 is displayed; a notch 78 is provided at the proximal end of the dose hub 7, and the notch 78 is used to abut against the second threaded body 67 to limit the maximum moving distance of the dose hub 7 when it is away from the pen body 6; a control spline 76 is provided at the distal end of the dose hub 7, and the dose hub 7 is rotated by controlling the spline 76.

[0170] Regarding the dose hub 7, please refer to Figures 10 and 11. Figure 10 is a schematic diagram of the dose hub provided in an embodiment of the present application, and Figure 11 is a full cross-sectional view of the dose hub provided in an embodiment of the present application.

[0171] In this embodiment, the outer side of the dose hub 7 is designed with a third threaded body 71, which enables it to be threadedly matched with the second threaded body 67 inside the pen outer barrel 69. This threaded match allows the dose hub 7 to move precisely axially in the pen outer barrel 69 while maintaining synchronous rotation with the pen outer barrel 69, which is crucial for precise dose adjustment.

[0172] The dose hub 7 is also provided with logo printing 77, which provides visual instructions about the dose setting. In order to make these logo printing 77 visible, a window 64 is provided on the pen outer barrel 69. Through the window 64, the user can directly see the logo printing 77 on the dose hub 7, so as to easily read the current dose setting.

[0173] In order to limit the maximum moving distance of the dose hub 7 in the direction away from the pen body 6, a notch 78 is designed at the proximal end of the dose hub 7. This notch 78 abuts against the second threaded body 67 inside the pen outer barrel 69 to form a stop point to prevent the dose hub 7 from excessively rotating or moving out of the range of the pen outer barrel 69.

[0174] In addition, a manipulation spline 76 is provided at the distal end of the dose hub 7, which is a structure for the user to manually rotate the dose hub 7. Through the manipulation spline 76, the user can conveniently rotate the dose hub 7 to adjust to a desired dose setting.

[0175] Please continue to refer to Figures 10 and 11. In some cases, the structure of the dose hub 7 includes a third threaded body 71, an elastic arm 72, a limiting rib position 73, a coupling spline 74, a limiting groove 75, a control spline 76, a logo printing 77, and a notch 78. The outer third threaded body 71 is engaged with the two distal second threaded bodies 67 on the inner side of the pen body 6 to ensure that the dose hub 7 can only make specific axial movement and synchronous rotation in the pen body 6 along the thread pitch. The proximal elastic arm 72 is engaged with the diamond-shaped feedback rib position 68 extending axially on the outer side of the inner tube 65 of the pen body 6, so that when the dose hub 7 rotates to adjust the dose, it can make indirect contact with the pen body 6 to make a sound; the proximal symmetrical elastic arm 72 limits the clutch 12 to the proximal axial position inside the dose hub 7. The inner axial symmetrical limiting rib position 73 is engaged with the symmetrical groove 111 on the outer side of the limiting nut 11, so as to limit the limiting nut 11 to only make synchronous rotation with the dose hub 7 and axial movement along the limiting rib position 73. When the clutch 11 is in a position biased toward the proximal end in the dose hub 7, the distal inner longitudinal coupling spline 74 is used to engage with the clutch distal longitudinal coupling protrusion 126 to achieve radial engagement, thereby realizing the function of synchronous rotation with the clutch 12. The distal inner radial limit groove 75 engages with the clutch 12 distal limit flange 121 to limit the clutch 11 to a position biased toward the distal end in the dose hub 7. The distal outer control spline 76 is convenient for the user to turn and adjust. The logo printing 77 is displayed through the window 64 at the distal end of the pen body 6 to let the user know the current use status of the injection pen. The proximal notch 78 abuts against one of the two second threaded bodies 67 at the distal end of the pen body 6 at the more proximal position to limit the maximum axial displacement of the dose hub 7 in the pen body 6.

[0176] In some embodiments, the pen body mechanism 100 includes a pen core frame 9, which is connected to the pen body 6, and the pen core frame 9 is used to install the medicine bottle container 1 and the needle;

[0177] The injection pen further comprises a pen cap 8 , which is detachably connected to a pen core frame 9 .

[0178] Regarding the pen body 6, please refer to Figures 8 and 9. Figure 8 is a full cross-sectional view of the pen body provided in the embodiment of the present application, and Figure 9 is a half cross-sectional view of the pen body provided in the embodiment of the present application.

[0179] Regarding the pen cap 8, please refer to Figure 12, which is a schematic diagram of the pen cap provided in an embodiment of the present application.

[0180] Regarding the refill holder 9, please refer to FIG. 13, which is a schematic diagram of the refill holder provided in an embodiment of the present application.

[0181] In this embodiment, the pen body mechanism 100 further includes a refill holder 9, which is connected to the pen body 6 and has the important function of installing the medicine bottle container 1 and the needle. The refill holder 9 is designed to firmly fix the medicine bottle container 1 to ensure stable delivery of the liquid medicine during the injection process. At the same time, the refill holder 9 is also used to install a disposable needle, so that the injection pen can safely and hygienically perform drug injection.

[0182] In addition, the design of the injection pen also includes a pen cap 8, which is a component that is detachably connected to the refill holder 9. The main function of the pen cap 8 is to protect the needle when the injection pen is not in use to prevent the needle from being contaminated or accidentally damaged. Through the detachable connection with the refill holder 9, the user can easily install or remove the pen cap 8 as needed, which provides convenience and flexibility.

[0183] Please continue to refer to Figures 8 and 9. In some cases, the structure of the pen body 6 includes a mounting hole 61, a window 62, a positioning rib 63, a viewing window 64, a pen inner barrel 65, a limiting portion 66, a second threaded body 67, a feedback rib 68, and a pen outer barrel 69. The four distal mounting holes 61 are engaged with the four symmetrical mounting protrusions 31 at the distal end of the push rod nut 3 to fix the axial position of the push rod nut 3 in the pen body 6. The four symmetrical windows 62 at the proximal end are engaged with the corresponding buckles 92 at the distal end of the pen core frame 9 to limit the radial position and axial position of the pen core frame 9 and fix the pen core frame 9 on the pen body 6. The proximal inner positioning rib 63 is engaged with the laterally symmetrical positioning groove 33 of the push rod nut 3 to provide guidance during assembly and limit the radial position of the push rod nut 3 on the pen body 6. The logo printing 77 of the dose hub 7 displayed through the distal viewing window 64 allows the user to clearly know the current use status of the injection pen. The proximal limiter 66 abuts against the end of the push rod sleeve 5 to limit the axial movement of the push rod sleeve 5 toward the distal end. The two inner distal second threaded bodies 67 are engaged with the outer third threaded body 71 of the dose hub 7 to ensure that the dose hub 7 can only make specific axial movement and synchronous rotation in the pen body 6 according to the thread pitch; the more proximal position of the two inner distal second threaded bodies 67 will abut against the proximal notch 78 of the dose hub 7 to limit the maximum axial displacement of the dose hub 7 in the pen body 6. The diamond-shaped feedback ribs 68 extending axially from the outer side of the pen inner barrel 65 are engaged with the proximal elastic arm 72 of the dose hub 7 to make indirect contact with the pen body 6 to make a sound when the dose hub 7 is rotated to adjust the dose.

[0184] Please continue to refer to Figure 12. In some cases, the structure of the pen cap 8 includes a pen clip 81, a cap opening slot 82, a cap groove 83, and a main body 84. The pen clip 81 allows the user to conveniently clip the injection pen to a pocket, and also provides an anti-roll feature. When the pen cap 8 is connected to the refill rack 9, the cap opening slot 82 matches the surface of the refill rack 9. The distal inner edge annular cap groove 83 is engaged with the distal positioning block 91 of the refill rack 9, so that the pen cap 8 can be axially positioned on the refill rack 9 at any angle in the circumferential direction; the limiting groove 83 of the annular groove can provide a radial positioning. The main body 84 can completely accommodate the proximal part of the refill rack 9 with the needle installed.

[0185] Please continue to refer to Figure 13. In some cases, the structure of the refill holder 9 includes a positioning block 91, a buckle 92, a refill window 93, and a threaded interface 94. The distal positioning block 91 is engaged with the annular cap groove 83 at the distal inner edge of the pen cap, so that the pen cap 8 can be axially positioned on the refill holder 9 at any angle in the radial direction. The distal corresponding buckle 92 is engaged with the four symmetrical windows 62 at the proximal end of the pen body 6 to limit the radial position and axial position of the refill holder 9 and fix the refill holder 9 on the pen body 6. The refill window 93 allows the user to observe the position of the rubber plug 2 inside the medicine bottle container 1 and understand the usage. The proximal threaded interface 94 is used to install a disposable needle.

[0186] In some embodiments, a threaded interface 94 is provided at the proximal end of the refill frame 9, and the threaded interface 94 is used to install a needle; a buckle 92 is provided at the distal end of the refill frame 9, and the pen outer tube 69 is provided with a window 62 that cooperates with the buckle 92 to limit the axial position and circumferential position of the refill frame 9; the refill frame 9 is provided with a refill window 93, and the position of the rubber plug 2 inside the medicine bottle container 1 is observed through the refill window 93; a positioning block 91 is provided on the outer side of the refill frame 9, and the pen cap 8 is provided with a cap groove 83 that cooperates with the positioning block 91 to limit the axial position of the pen cap 8.

[0187] In this embodiment, the structural design of the cartridge holder 9 is refined to ensure its stability and functionality in the injection pen. A threaded interface 94 is designed at the proximal end of the cartridge holder 9, which is specifically used to install the needle, ensuring that the needle can be firmly connected to the injection pen and facilitating the replacement or installation of a new needle.

[0188] The distal end of the cartridge holder 9 is provided with a buckle 92, which cooperates with the window 62 on the pen outer barrel 69. Through this cooperation, the axial position and circumferential position of the cartridge holder 9 are effectively restricted, ensuring the stability of the cartridge holder 9 in the pen body 6 and preventing displacement or rotation during use, which is crucial to ensuring the accuracy of the injection dose.

[0189] The refill holder 9 is also provided with a refill window 93, which allows the user to directly observe the position of the rubber plug 2 inside the medicine bottle container 1, thereby monitoring the remaining amount of liquid medicine and the injection status. This intuitive visual feedback is very useful for the operator because it provides instant information about the status of the injection pen.

[0190] In addition, a positioning block 91 is provided on the outer side of the core frame 9, and this structure cooperates with the cap groove 83 on the pen cap 8. Through this cooperation, the axial position of the pen cap 8 is restricted, ensuring that the pen cap 8 can be firmly installed on the core frame 9, and at the same time, it is convenient for users to remove or install the pen cap 8 as needed, which increases the convenience of use.

[0191] Please refer to Figures 19 and 20. Figure 19 is an assembly diagram of the feedback-optimized injection pen provided in an embodiment of the present application, and Figure 20 is a usage diagram of the feedback-optimized injection pen provided in an embodiment of the present application.

[0192] In a specific embodiment, the feedback optimized injection pen provided by the present application is a multi-dose adjustable and multi-use prefilled drug injection pen, including an injection button 13, a clutch 12, a dosage hub 7, a push rod sleeve 5, a limit nut 11, a push rod 4, a push rod buckle 10, a pen body 6, a push rod nut 3, and a pen core frame 9. The injection can be performed by rotating the dosage hub 7 and pressing the injection button 13. This solution is different from similar products on the market in terms of component structure and parts matching. Through the design of the pen body 6 and the dosage hub 7 matching, the user's touch and sound when adjusting the dosage become more accurate and easy to adjust, eliminating the effect that other products can only achieve by using multiple parts and springs.

[0193] The dosage hub 7 has at least two internal limiting ribs 73, a proximal elastic arm 72, a third threaded body 71 and a proximal radial control spline 76. The clutch 12 as a brake member has a distal radially outwardly extending limiting flange 121, at least one radially protruding axial rib 124, and at least one longitudinal engaging protrusion 126. The push rod sleeve 5 as a driving member includes: at least one internal radial axial groove 52, which engages at least one internal axial rib 124 of the clutch 12; and at least one limiting protrusion 53, which engages two grooves 43 of the push rod 4; and a proximal elastic sheet 51, which engages several internal longitudinal ribs 32 of the push rod nut 3.

[0194] The dose hub 7 includes a control spline 76, which the user turns to set the desired dose. The dose hub 7 also includes a logo print 77 with a plurality of numbers corresponding to a plurality of dose units visible in the window 64 provided on the pen body 6. The user turns the dose hub 7 until the desired dose is visible in the window 64. Once the desired dose is set, the user presses the injection button 13 until the set dose is completely injected. When the logo print 77 on the dose hub 7 shows 0 in the window 64 on the pen body 6, it is confirmed that the injection is complete.

[0195] During dose setting and dose correction, the clutch 12 moves axially together with the dose hub 7, but the clutch 12 does not rotate, and the push rod sleeve 5 has no rotational kinetic energy, so the push rod 4 does not make axial or rotational movements, and the dose adjustment sound is produced by the indirect contact between the elastic arm 72 of the dose hub 7 and the feedback rib 68 of the pen body 6; during injection, the clutch 12 moves axially and rotationally together with the dose hub 7, and the push rod sleeve 5 drives the push rod 4 to generate rotational kinetic energy, so the push rod 4 will make axial movement through the push rod nut 3 to discharge the medicine, and the injection sound is produced by the indirect contact between the spring piece 51 of the push rod sleeve 5 and the radial ratchet hole 32 of the push rod nut 3.

[0196] Please refer to FIG. 21 , which is a first state diagram of the feedback-optimized injection pen provided in an embodiment of the present application.

[0197] FIG. 21 shows an exemplary embodiment of the present application. When the user rotates the dose hub 7 to adjust the dose (the injection button 13 is not pressed toward the proximal end), the proximal symmetrical spring piece 51 of the push rod sleeve 5 abuts against the radial ratchet hole 32 inside the push rod nut 3, thereby limiting the push rod sleeve 5 from rotating in one direction. The distal limit flange 121 of the clutch 12 abuts against the distal inner limit groove 75 of the dose hub 7, and the proximal end of the clutch 12 abuts against the inner elastic arm 72 of the dose hub 7, thereby limiting the clutch 12 in the dose hub 7, always being in a relatively distal position. As shown in the figure, when the dose hub 7 is rotated, its proximal elastic arm 72 will have some intermittent contact with the feedback rib 68 inside the pen body 6, so as to produce the feel and sound when adjusting the dose.

[0198] Please refer to FIG. 22 , which is a second state diagram of the feedback-optimized injection pen provided in an embodiment of the present application.

[0199] FIG. 22 shows an exemplary embodiment according to the present application. When the user presses the injection button 13, the relative axial position of the clutch 12 in the dose hub 7 moves toward the proximal end. At this time, the coupling protrusion 126 at the distal end of the clutch 12 engages with the coupling spline 74 inside the distal end of the dose hub 7, forcing the clutch 12 to rotate synchronously with the dose hub 7. The inner elastic arm 72 at the proximal end of the dose hub 7 will deform inward, thereby weakening the sound produced by the rotation of the dose hub 7 and the feedback rib 68 in the pen body 6. Since the clutch 12 rotates, the push rod sleeve 5 is driven to rotate synchronously, so the push rod 4 rotates with the push rod sleeve 5 to discharge the required dose. The proximal symmetrical spring piece 51 of the push rod sleeve 5 cooperates with the radial ratchet hole 32 inside the push rod nut 3 to produce some intermittent contact to produce the feel and sound of injecting the dose.

[0200] Please refer to FIG. 23 , which is a third state diagram of the feedback-optimized injection pen provided in an embodiment of the present application.

[0201] FIG. 23 shows an exemplary embodiment of the present application. When the clutch 12 does not rotate synchronously with the dose hub 7 (dose adjustment), the limit nut 11 rotates with the rotation of the dose hub 7, and the first internal thread 112 of the limit nut 11 generates a corresponding axial displacement toward the distal end (increasing the dose) or toward the proximal end (reducing the dose) with the first external thread 123 of the clutch 12. The amplitude of the displacement is determined by the pitch of the clutch 12. When the limit nut 11 rotates to the end of the thread of the farthest clutch 12, the dose hub 7 is restricted from further rotation, so that the user can no longer rotate toward the distal end to increase the dose. When injecting, since the clutch 12 rotates synchronously with the dose hub 7, the limit nut 11 stays at the axial position on the clutch 12 before injection.

[0202] Please refer to FIG. 24 , which is a fourth state diagram of the feedback-optimized injection pen provided in an embodiment of the present application.

[0203] FIG. 24 shows an exemplary embodiment of the present application. When the user rotates the dose hub 7 toward the distal end to adjust the maximum dose, the dose hub 7 is rotated until the notch 78 at the proximal end thereof touches the second threaded body 67 at the distal end of the pen body 6. The proximal side of the notch prevents the dose hub 7 from continuing to rotate axially toward the distal end. This feature is used to restrict the user from continuing to increase the dose.

[0204] It should be noted that many of the components mentioned in this application are universal standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0205] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0206] The above is a detailed introduction to the feedback optimized injection pen provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A feedback optimized injection pen, characterized in that: It includes a pen body mechanism, an adjustment mechanism and an injection mechanism; The pen body mechanism comprises a pen body, wherein the pen body comprises an outer pen tube and an inner pen tube, and a feedback rib position is arranged on the outer side of the inner pen tube; The adjustment mechanism comprises a dose hub, the outer side of which is threadedly matched with the outer barrel of the pen, and the dose hub is provided with an elastic arm, and the elastic arm contacts the feedback rib to generate feedback when the dose hub rotates; The injection mechanism and the regulating mechanism have two states, namely, coupling and decoupling. When the injection mechanism is coupled with the regulating mechanism, the injection mechanism pushes the liquid medicine in the medicine bottle container under the action of the regulating mechanism.

2. The feedback optimized injection pen according to claim 1, characterized in that: The elastic arm is used to be deformed by the pushing of the injection mechanism to separate from the feedback rib when the injection mechanism is coupled with the adjustment mechanism; when the injection mechanism is decoupled from the adjustment mechanism, the elastic arm maintains contact with the feedback rib.

3. The feedback optimized injection pen according to claim 1, characterized in that: The injection mechanism comprises: A clutch is arranged inside the dosage hub, the clutch is rotatable and movable, the clutch is connected to an injection button located at the distal end of the pen body mechanism, and the clutch and the dosage hub have two states of coupling and decoupling at different moving positions of the clutch; A push rod sleeve is arranged inside the clutch, and the push rod sleeve rotates under the restriction of the clutch; A push rod is arranged inside the push rod sleeve. The push rod can move and rotate under the restriction of the push rod sleeve. The push rod is threadedly matched with the pen body mechanism. A push rod buckle is provided at the proximal end of the push rod, and the push rod buckle is used to push the rubber stopper of the medicine bottle container.

4. The feedback optimized injection pen according to claim 3, characterized in that: The clutch comprises a clutch outer cylinder and a clutch inner cylinder, and the push rod sleeve is arranged between the clutch outer cylinder and the clutch inner cylinder.

5. The feedback optimized injection pen according to claim 4, characterized in that: The outer side of the clutch inner cylinder is provided with axial ribs, and the inner side of the push rod sleeve is provided with axial grooves matched with the axial ribs, so as to realize the rotation of the push rod sleeve under the restriction of the clutch.

6. The feedback optimized injection pen according to claim 3, characterized in that: The distal end of the clutch is provided with a coupling protrusion, and the distal end of the dosage hub is provided with a coupling spline, and the coupling protrusion and the coupling spline have two states of coupling and decoupling at different moving positions of the clutch; When the clutch moves toward the proximal end of the dosage hub, the coupling protrusion is coupled with the coupling spline, and the dosage hub moves toward the proximal end of the pen body driven by the clutch; when the coupling protrusion is decoupled from the coupling spline, the clutch moves toward the distal end of the pen body driven by the dosage hub.

7. The feedback optimized injection pen according to claim 3, characterized in that: The elastic arm is arranged at the proximal end of the dosage hub, and a limiting groove is arranged at the distal end of the dosage hub, and the moving position of the clutch is limited by the elastic arm and the limiting groove; When the clutch is coupled to the dosage hub, the proximal end of the clutch pushes the elastic arm, and the elastic arm is separated from the feedback rib; when the clutch is decoupled from the dosage hub, the elastic arm maintains contact with the feedback rib.

8. The feedback optimized injection pen according to claim 3, characterized in that: A spring sheet is disposed on the outer side of the push rod sleeve, and the spring sheet contacts the pen body mechanism to generate feedback when the push rod sleeve rotates.

9. The feedback optimized injection pen according to claim 8, characterized in that: The pen body mechanism comprises a push rod nut, and the push rod nut is connected to the pen body. The push rod is passed through the push rod nut and matched with the push rod thread. The push rod nut is provided with a ratchet hole, and the ratchet hole limits the unidirectional rotation of the spring sheet. When the push rod sleeve rotates, the spring sheet and the ratchet hole contact to generate feedback.

10. The feedback optimized injection pen according to claim 9, characterized in that: An elastic arm is provided at the proximal end of the push rod nut, and the elastic arm is used to support the medicine bottle container, and the elastic action of the elastic arm is used to achieve buffering of the medicine bottle container; a positioning groove is provided on the outer side of the push rod nut, and a positioning rib that cooperates with the positioning groove is provided on the inner side of the pen outer barrel to guide the push rod nut to be installed into the pen body and limit the circumferential position of the push rod nut; a mounting protrusion is provided at the distal end of the push rod nut, and the pen outer barrel is provided with a mounting hole that cooperates with the mounting protrusion to limit the axial position and circumferential position of the push rod nut.

11. The feedback optimized injection pen according to claim 9, characterized in that: A first threaded body is provided on the outer side of the push rod, and the first threaded body cooperates with the push rod nut thread; a mounting head is provided at the proximal end of the push rod, and the mounting head is connected to the push rod buckle; a groove is provided on the outer side of the push rod for disconnecting the first threaded body along the axial direction of the push rod, and a limiting protrusion cooperating with the groove is provided on the inner side of the push rod sleeve to enable the push rod to be movable in the push rod sleeve and rotate under the restriction of the push rod sleeve.

12. The feedback optimized injection pen according to claim 9, characterized in that: The push rod nut is located at the proximal end of the push rod sleeve, and a limiting portion is provided at the proximal end of the pen inner tube. The limiting portion is located on the side of the spring sheet away from the proximal end of the push rod sleeve, and the axial position of the push rod sleeve is limited by the push rod nut and the limiting portion.

13. The feedback optimized injection pen according to claim 4, characterized in that: The adjustment mechanism also includes a limit nut, a groove is provided on the outer side of the limit nut, a first internal thread is provided on the inner side of the limit nut, and a limiting rib is provided on the inner side of the dose hub that cooperates with the groove to enable the limit nut to be movable on the dose hub and rotate under the restriction of the dose hub, and a first external thread is provided on the outer side of the clutch outer cylinder that cooperates with the first internal thread.

14. The feedback optimized injection pen according to claim 1, characterized in that: A third threaded body is provided on the outer side of the dose hub, and a second threaded body threadably matched with the third threaded body is provided on the inner side of the pen outer barrel; the dose hub is provided with a logo printing, and the pen outer barrel is provided with a window, through which the logo printing is displayed; a notch is provided at the proximal end of the dose hub, and the notch is used to abut against the second threaded body to limit the maximum moving distance of the dose hub when it moves away from the pen body; a control spline is provided at the distal end of the dose hub, and the dose hub is rotated by the control spline.

15. The feedback optimized injection pen according to claim 1, characterized in that: The pen body mechanism comprises a core frame, the core frame is connected to the pen body, and the core frame is used to install a cartridge bottle container and a needle; The injection pen also includes a pen cap, which is detachably connected to the pen core frame.

16. The feedback optimized injection pen according to claim 15, characterized in that: A threaded interface is provided at the proximal end of the refill frame, and the threaded interface is used to install a needle; a buckle is provided at the distal end of the refill frame, and the pen outer tube is provided with a window that cooperates with the buckle to limit the axial position and circumferential position of the refill frame; the refill frame is provided with a refill viewing window, through which the position of the plug inside the medicine bottle container can be observed; a positioning block is provided on the outer side of the refill frame, and the pen cap is provided with a cap groove that cooperates with the positioning block to limit the axial position of the pen cap.

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