A feedback-optimized injection pen

Abstract

This application discloses a feedback-optimized injection pen, relating to the field of medical device technology. The feedback-optimized injection pen includes a pen body, an adjustment mechanism, and an injection mechanism. The pen body includes a pen body with an outer cylinder and an inner cylinder, with a feedback rib on the outer side of the inner cylinder. The adjustment mechanism includes a dose hub, the outer side of which is threaded into the outer cylinder. The dose hub has a spring arm, which contacts the feedback rib to generate feedback when the dose hub rotates. The injection mechanism and adjustment mechanism have both coupled and decoupled states. When the injection mechanism is coupled to the adjustment mechanism, the injection mechanism pushes the liquid medication from the vial container under the action of the adjustment mechanism. This feedback-optimized injection pen, through its double-cylinder design, strengthens the assembly relationship with the dose hub and generates precise adjustment feedback during dose adjustment through the contact between the spring arm and the feedback rib, thereby improving the accuracy of dose setting and the reliability of the injection pen.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a feedback-optimized injection pen. Background Technology

[0002] As a convenient drug delivery tool, an injection pen typically includes main components such as an injection needle, a vial container, and a pen body. Through a dosage adjustment mechanism, it allows the operator to set the injection dosage as needed.

[0003] In practice, the inventors discovered that existing injection pens have some shortcomings. The dosage adjustment feedback of the injection pen is not precise enough. Due to the large assembly gaps between the dosage adjustment structures, the dosage adjustment structure is prone to loosening, which may lead to inaccurate dosage settings and make it impossible to meet the accurate drug injection volume. Summary of the Invention

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

[0005] To achieve the above objectives, this application provides a feedback-optimized injection pen, including a pen body mechanism, an adjustment mechanism, and an injection mechanism;

[0006] The pen body mechanism includes a pen body, which has an outer cylinder and an inner cylinder, and the outer side of the inner cylinder is provided with a feedback rib.

[0007] The adjustment mechanism includes a dose hub, the outer side of which is threaded into the outer cylinder of the pen. The dose hub is provided with a spring arm, which contacts the feedback rib when the dose hub rotates to generate feedback.

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

[0009] In some embodiments, the spring arm is configured to deform under the pushing of the injection mechanism to separate from the feedback rib when the injection mechanism is coupled to the adjustment mechanism; when the injection mechanism is decoupled from the adjustment mechanism, the spring arm remains in contact with the feedback rib.

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

[0011] The clutch is located inside the dosing hub. The clutch is rotatable and movable. The clutch is connected to an injection button located at the far end of the pen body mechanism. The clutch and the dosing hub have two states: coupling and decoupling, depending on the different moving positions of the clutch.

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

[0013] A push rod is located inside the push rod sleeve. The push rod is movable and rotates under the restriction of the push rod sleeve. The push rod is threadedly engaged with the pen body mechanism. A push rod buckle is provided at the proximal end of the push rod. The push rod buckle is used to push the rubber stopper of the medicine bottle container.

[0014] In some embodiments, the clutch has an outer clutch cylinder and an inner clutch cylinder, and the push rod sleeve is provided between the outer clutch cylinder and the inner clutch cylinder.

[0015] In some embodiments, the outer side of the clutch inner cylinder is provided with an axial rib, and the inner side of the push rod sleeve is provided with an axial groove that mates with the axial rib, so as to enable the push rod sleeve to rotate under the restriction of the clutch.

[0016] In some embodiments, the clutch has a coupling protrusion at its distal end and the dosing hub has a coupling spline at its distal end. The coupling protrusion and the coupling spline have two states: coupling and decoupling, at different moving positions of the clutch.

[0017] When the clutch moves toward the proximal end of the dosing hub, the engagement protrusion couples with the engagement spline, and the dosing hub moves toward the proximal end of the pen body under the drive of the clutch; when the engagement protrusion decouples from the engagement spline, the clutch moves toward the distal end of the pen body under the drive of the dosing hub.

[0018] In some embodiments, the spring arm is disposed at the proximal end of the dosing hub, and the distal end of the dosing hub is provided with a limiting groove, and the movement position of the clutch is limited by the spring arm and the limiting groove;

[0019] When the clutch is coupled to the dose hub, the proximal end of the clutch pushes the spring arm, and the spring arm separates from the feedback rib; when the clutch is decoupled from the dose hub, the spring arm remains in contact with the feedback rib.

[0020] In some embodiments, a spring is provided on the outer side of the push rod sleeve, and the spring 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 connected to the pen body, a push rod passing through the push rod nut and threadedly engaged with the push rod, and a ratchet hole provided in the push rod nut to restrict the unidirectional rotation of the spring piece. The spring piece and the ratchet hole contact each other to generate feedback when the push rod sleeve rotates.

[0022] In some embodiments, the proximal end of the push rod nut is provided with an elastic arm, which is used to hold the medicine bottle container and to cushion the medicine bottle container by means of the elasticity of the elastic arm; the outer side of the push rod nut is provided with a positioning groove, and the inner side of the pen outer cylinder is provided with a positioning rib that cooperates with the positioning groove, so as to guide the push rod nut into the pen body and restrict the circumferential position of the push rod nut; the distal end of the push rod nut is provided with a mounting protrusion, and the pen outer cylinder is provided with a mounting hole that cooperates with the mounting protrusion, so as to restrict the axial and circumferential positions of the push rod nut.

[0023] In some embodiments, the push rod has a first threaded body on its outer side, which is threadedly engaged with the push rod nut; the push rod has a mounting head at its proximal end, which is connected to the push rod buckle; the push rod has a groove on its outer side that disconnects the first threaded body along the axial direction of the push rod, and the push rod sleeve has a limiting protrusion on its inner side that engages with the groove, so as to enable the push rod to move within 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 cylinder. The limiting portion is located on the side of the spring piece 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 adjusting mechanism further includes a limiting nut, the outer side of which is provided with a groove, the inner side of which is provided with a first internal thread, and the inner side of the dosing hub is provided with a limiting rib that cooperates with the groove, so as to enable the limiting nut to move on the dosing hub and rotate under the restriction of the dosing hub, and the outer side of the clutch outer cylinder is provided with a first external thread that is threadedly engaged with the first internal thread.

[0026] In some embodiments, the outer side of the dosing hub is provided with a third threaded body, and the inner side of the pen outer cylinder is provided with a second threaded body that is threadedly engaged with the third threaded body; the dosing hub is provided with a marking print, and the pen outer cylinder is provided with a window to display the marking print; the proximal end of the dosing hub is provided with a notch, which is used to abut against the second threaded body to limit the maximum movement distance of the dosing hub away from the pen body; the distal end of the dosing hub is provided with a control spline, through which the dosing hub is rotated.

[0027] In some embodiments, the pen body mechanism includes a refill holder connected to the pen body, the refill holder being used to mount a medicine bottle container and a needle;

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

[0029] In some embodiments, the pen refill holder has a threaded interface at its proximal end for mounting a needle; the pen refill holder has a snap fastener at its distal end, and the pen outer cylinder has a window that engages with the snap fastener to limit the axial and circumferential positions of the pen refill holder; the pen refill holder has a pen refill viewing window through which the position of the rubber stopper inside the medicine bottle container can be observed; the pen refill holder has a positioning block on its outer side, and the pen cap has a cap groove that engages with the positioning block to limit the axial position of the pen cap.

[0030] Compared to the aforementioned background technology, the feedback-optimized injection pen provided in this application mainly includes a pen body mechanism, an adjustment mechanism, and an injection mechanism; the pen body mechanism includes a pen body, which has an outer cylinder and an inner cylinder, and a feedback rib is provided on the outer side of the inner cylinder; the adjustment mechanism includes a dose hub, the outer side of which is threadedly engaged with the outer cylinder, and the dose hub is provided with a spring arm, which contacts the feedback rib to generate feedback when the dose hub rotates; the injection mechanism and the adjustment mechanism have two states: coupled and decoupled. When the injection mechanism and the adjustment mechanism are coupled, the injection mechanism pushes the liquid medicine in the vial container under the action of the adjustment mechanism.

[0031] Considering the shortcomings of existing injection pens, especially the inaccurate dose adjustment feedback and loose structure, this technical solution proposes a feedback-optimized injection pen. Its design focuses on strengthening the assembly relationship with the dose hub through the inner and outer double-cylinder structure of the pen body, and providing accurate adjustment feedback during dose adjustment.

[0032] The pen body mechanism consists of an outer cylinder and an inner cylinder. This design achieves functional partitioning and improves the overall structural stability. The outer cylinder engages with the outer thread of the dosing hub, limiting the rotation and movement of the dosing hub along a set path and ensuring the accuracy of dose adjustment. When dose adjustment is required, the dosing hub, through its thread engagement with the outer cylinder, achieves backward rotation and movement for adjustment, as well as forward rotation and movement for feed. This mechanical engagement reduces assembly gaps, thereby lowering the possibility of structural loosening.

[0033] Meanwhile, a feedback rib is located on the outer side of the pen's inner cylinder, which contacts the spring arm on the dosage hub. During the rotation of the dosage hub, the contact between the spring arm and the feedback rib generates direct physical feedback. This feedback mechanism allows the operator to perceive subtle changes in each dosage adjustment, improving the accuracy of dosage setting. This feedback not only provides tactile feedback but may also be accompanied by auditory feedback, enhancing the operator's perception of the dosage adjustment process.

[0034] Furthermore, the injection mechanism and the adjustment mechanism can be in both coupled and decoupled states. 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. However, 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. Moreover, the injection volume 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 vial 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] Based on the above structural and process descriptions, it can be seen that this 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-cylinder design of the pen body, and generates precise adjustment feedback through the contact between the spring arm and the feedback rib during dosage adjustment, thereby improving the accuracy of dosage setting and the reliability of the injection pen. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0037] Figure 1 A schematic diagram of a feedback-optimized injection pen provided in an embodiment of this application;

[0038] Figure 2 for Figure 1 Exploded view of the pen body mechanism;

[0039] Figure 3 A cross-sectional view of a feedback-optimized injection pen provided in an embodiment of this application;

[0040] Figure 4 A schematic diagram of the push rod nut provided in an embodiment of this application;

[0041] Figure 5 A cross-sectional view of the push rod nut provided in an embodiment of this application;

[0042] Figure 6 A schematic diagram of the push rod provided in an embodiment of this application;

[0043] Figure 7 A schematic diagram of the push rod sleeve provided in an embodiment of this application;

[0044] Figure 8 A full sectional view of the pen body provided for an embodiment of this application;

[0045] Figure 9 A half-sectional view of the pen body provided for an embodiment of this application;

[0046] Figure 10 A schematic diagram of the dose hub provided in the embodiments of this application;

[0047] Figure 11 A full cross-sectional view of the dose hub provided in the embodiments of this application;

[0048] Figure 12 A schematic diagram of a pen cap provided in an embodiment of this application;

[0049] Figure 13 A schematic diagram of a pen refill holder provided in an embodiment of this application;

[0050] Figure 14 A schematic diagram of the push rod buckle provided in an embodiment of this application;

[0051] Figure 15 A schematic diagram of a limiting nut provided in an embodiment of this application;

[0052] Figure 16 A schematic diagram of a clutch provided for an embodiment of this application;

[0053] Figure 17 A full sectional view of the clutch provided in an embodiment of this application;

[0054] Figure 18 A schematic diagram of the injection button provided in an embodiment of this application;

[0055] Figure 19 An assembly diagram of a feedback-optimized injection pen provided in an embodiment of this application;

[0056] Figure 20 A diagram illustrating the use of a feedback-optimized injection pen provided in an embodiment of this application;

[0057] Figure 21 A first state diagram of a feedback-optimized injection pen provided in an embodiment of this application;

[0058] Figure 22 The second state diagram of the feedback-optimized injection pen provided in the embodiments of this application;

[0059] Figure 23 A third state diagram of a feedback-optimized injection pen provided in an embodiment of this application;

[0060] Figure 24 The fourth state diagram of the feedback-optimized injection pen provided in the embodiments of this application.

[0061] in:

[0062] Pen body mechanism 100,

[0063] 3. Push rod nut

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

[0065] Pen body 6,

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

[0067] Pen cap 8

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

[0069] Pen refill holder 9

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

[0071] Adjustment mechanism 200

[0072] Dosage hub 7,

[0073] Third thread body 71, spring arm 72, limiting rib 73, connecting spline 74, limiting groove 75, control spline 76, marking printing 77, notch 78;

[0074] Limit nut 11

[0075] Groove 111, First internal thread 112;

[0076] Injection button 13

[0077] Pressing part 131, snap connector 132;

[0078] Injection facility 300

[0079] Push rod 4

[0080] First threaded body 41, mounting head 42, channel 43;

[0081] Push rod sleeve 5,

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

[0083] Push lever buckle 10,

[0084] Caliper part 101, flat part 102;

[0085] Clutch 12

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

[0087] Medicine bottle container 1, rubber stopper 2. Detailed Implementation

[0088] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0089] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0090] Please refer to Figures 1 to 3 ,in, Figure 1 This is a schematic diagram of a feedback-optimized injection pen provided in an embodiment of this application. Figure 2 for Figure 1 Exploded view of the pen body mechanism. Figure 3 A cross-sectional view of a feedback-optimized injection pen provided in an embodiment of this application.

[0091] In a first specific embodiment, the feedback-optimized injection pen provided by 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 used to mount and support the adjustment mechanism 200 and the injection mechanism 300. The adjustment mechanism 200 adjusts the dosage, and the injection mechanism 300 injects the set dosage of the drug solution. The adjustment function of the adjustment mechanism 200 is achieved by the movement distance of its component, and the injection function of the injection mechanism 300 is achieved by the movement distance of its component being related to the movement distance of the component of the adjustment mechanism 200.

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

[0094] The adjustment mechanism 200 includes a dosage hub 7, the outer side of which is threaded into the outer cylinder 69 of the pen. The dosage hub 7 is provided with a spring arm 72, which contacts the feedback rib 68 when the dosage hub 7 rotates to generate feedback. When adjusting the dosage, the dosage hub 7 is rotated, causing it to move towards the distal end of the injection pen. At this time, the spring arm 72 indirectly contacts the feedback rib 68 to generate feedback. The feedback sensation includes, but is not limited to, tactile and audible sensations. This feedback sensation is related to the adjustment amount of the adjustment mechanism 200, thus providing adjustment feedback.

[0095] The injection mechanism 300 and the adjustment mechanism 200 have two states: coupled and decoupled. When the injection mechanism 300 and the adjustment mechanism 200 are coupled, the injection mechanism 300 pushes the liquid medicine in the vial container 1 under the action of the adjustment mechanism 200. This means that when the adjustment mechanism 200 adjusts the dosage, the injection mechanism 300 and the adjustment mechanism 200 are in a decoupled state. The injection mechanism 300 will not be affected by the adjustment mechanism 200 and will not produce incorrect injections. The injection mechanism 300 will only perform injection operations when it is coupled with the adjustment mechanism 200, and the injection volume of the injection mechanism 300 is related to the adjustment amount of the adjustment mechanism 200.

[0096] Based on the above solutions, and considering the shortcomings of existing injection pens, especially the inaccurate dose adjustment feedback and loose structure, this technical solution proposes a feedback-optimized injection pen. Its design focuses on strengthening the assembly relationship with the dose hub 7 through the inner and outer double-cylinder structure of the pen body 6, and providing accurate adjustment feedback during dose adjustment.

[0097] The pen body mechanism 100 consists of an outer cylinder 69 and an inner cylinder 65. This design achieves functional partitioning and improves the overall structural stability. The outer cylinder 69 engages with the outer thread of the dosing hub 7, limiting the rotation and movement of the dosing hub 7 along a set path and ensuring the accuracy of dose adjustment. When dose adjustment is required, the dosing hub 7, through its thread engagement with the outer cylinder 69, achieves backward rotation and movement adjustment, as well as forward rotation and movement feed. This mechanical engagement reduces assembly gaps, thereby reducing the possibility of structural loosening.

[0098] Meanwhile, a feedback rib 68 is provided on the outer side of the inner cylinder 65, which contacts the spring arm 72 on the dosing hub 7. During the rotation of the dosing hub 7, the contact between the spring arm 72 and the feedback rib 68 generates direct physical feedback. This feedback mechanism allows the operator to perceive subtle changes in 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.

[0099] Furthermore, the injection mechanism 300 and the adjustment mechanism 200 can be in both coupled and decoupled states. For example, when the dose hub 7 is adjusted backward, the injection mechanism 300 and the adjustment mechanism 200 are decoupled, and the adjustment action of the adjustment mechanism 200 will not affect the injection mechanism 300. However, when the dose hub 7 is advanced forward, the injection mechanism 300 and the adjustment mechanism 200 are coupled, and the adjustment mechanism 200 drives the injection mechanism 300 to achieve injection. Moreover, the injection volume 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 inject the liquid medicine in the vial 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] Based on the above structural and process descriptions, 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-cylinder design of the pen body 6, and generates precise adjustment feedback through the contact between the spring arm 72 and the feedback rib 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 in this article, the proximal end refers to the side closest to the needle and injection site, i.e., the tip of the feedback-optimized injection pen, while the distal end refers to the side opposite to the proximal end, i.e., the tail end of the feedback-optimized injection pen. Therefore, each component has its proximal and distal ends, and the proximal and distal ends of different components follow the same definition rules.

[0102] In some embodiments, the spring arm 72 is used to deform under the pushing of the injection mechanism 300 to separate from the feedback rib position 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 spring arm 72 remains in contact with the feedback rib position 68.

[0103] In this embodiment, when the injection mechanism 300 and the adjustment mechanism 200 are decoupled, it means that the adjustment operation of the adjustment mechanism 200 is being performed, rather than the injection operation of the injection mechanism 300. At this time, the spring arm 72 remains in contact with the feedback rib 68. This arrangement allows the spring arm 72 to generate normal feedback 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] Conversely, when the injection mechanism 300 is coupled to the adjustment mechanism 200, it means that the injection operation of the injection mechanism 300 is being performed, rather than the adjustment operation of the adjustment mechanism 200. In this case, the spring arm 72 is deformed by the push of the injection mechanism 300 and separates from the feedback rib 68. This separation ensures that unnecessary feedback will not be generated during the injection process due to the contact between the spring arm 72 and the feedback rib 68, thereby avoiding interference during the injection operation.

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

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

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

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

[0109] Push rod 4 is located inside push rod sleeve 5. Push rod 4 is movable and rotates under the restriction of push rod sleeve 5. Push rod 4 is threadedly engaged with pen body mechanism 100. Push rod buckle 10 is provided at the near end of push rod 4. Push rod buckle 10 is used to push the rubber stopper 2 of medicine bottle container 1.

[0110] Regarding putter 4, please refer to... Figure 6 , Figure 6 A schematic diagram of the push rod provided in an embodiment of this application.

[0111] For information on pushrod sleeve 5, please refer to [link / reference]. Figure 7 , Figure 7 This is a schematic diagram of the push rod sleeve provided in an embodiment of this application.

[0112] For information about clutch 12, please refer to [link / reference]. Figure 16 and Figure 17 , Figure 16 This is a schematic diagram of a clutch provided in an embodiment of this application. Figure 17 This is a full sectional view of the clutch provided in an embodiment of this application.

[0113] In this embodiment, the key design feature of the injection mechanism 300 lies in its interaction with the dosing hub 7, and how to precisely control the injection of the drug solution through this interaction. The clutch 12, as the core component of the injection mechanism 300, is located inside the dosing hub 7. It can not only rotate but also move within a certain range. This design allows the clutch 12 to couple or decouple from the dosing hub 7 at different positions, thereby controlling the operation of the injection mechanism 300.

[0114] The push rod sleeve 5 is housed 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 be precisely positioned 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. It is also movable and can rotate within the constraint of the push rod sleeve 5. The push rod 4 is connected to the pen body mechanism 100 via a threaded connection. This threaded connection not only provides a secure connection but also allows for precise axial movement of the push rod 4. 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 stopper 2 of the medicine bottle container 1. It is used to push the rubber stopper 2 during injection, thereby controlling the injection of the medicine.

[0116] 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 dosing hub 7. The clutch 12 and the dosing hub 7 are coupled and will rotate synchronously. At this time, if the clutch 12 continues to move, the dosing hub 7 will move and rotate simultaneously under the restriction of the pen outer cylinder 69, and the clutch 12 will rotate. 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. Since the push rod 4 is threadedly engaged with 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 towards the proximal end of the injection pen. By pushing the rubber stopper 2 of the medicine bottle container 1, the medicine is injected.

[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 the decoupled position in its natural state. The clutch 12 will not be activated by the action of the dose hub 7, so the dose 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 coupling between the injection mechanism 300 and the adjustment mechanism 200, the injection mechanism 300 will be associated with the action of the adjustment mechanism 200, and the adjustment amount of the adjustment mechanism 200 can be reflected in the injection amount of the injection mechanism 300.

[0118] It is important to note that the movement direction of the adjustment mechanism 200 is generally opposite during the adjustment and injection procedures. For example, during the adjustment procedure, the adjustment mechanism 200 moves distally, and the adjustment amount is reflected by the distance the adjustment mechanism 200 moves distally and proximally. During the injection procedure, the adjustment mechanism 200 moves proximally, and the injection mechanism 300 moves proximally under the action of the adjustment mechanism 200. The injection volume is related to the adjustment amount.

[0119] Please continue to refer to this. Figure 6 In some cases, the push rod 4 has a structure including a first threaded body 41, a mounting head 42, and a channel 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 part 101 of the push rod buckle 10 to fix the axial position of the push rod buckle 10 at the proximal end of the push rod 4. The channel 43 disconnects from the first threaded body 41 and engages with the radial limiting protrusion 53 on the inner side of the proximal end of the push rod sleeve 5 to control that the push rod 4 can always rotate synchronously with the push rod sleeve 5 and can move freely axially within the push rod sleeve 5.

[0120] Please continue to refer to this. Figure 7In some cases, the push rod sleeve 5 has a structure including a spring plate 51, an axial groove 52, and a limiting protrusion 53. The proximal symmetrical one-way spring plate 51 engages with the central radial ratchet hole 32 of the push rod nut 3 to restrict rotation within the push rod nut 3 to a fixed direction, and emits an injection warning sound through indirect contact with the central radial ratchet hole 32. The symmetrical axial groove 52 extending from the middle to the distal end on the inner side engages with two symmetrical axial ribs 124 on the outer side of the clutch inner cylinder 125 of the clutch 12, restricting the push rod sleeve 5 from rotating synchronously with the clutch 12 and allowing axial displacement within the clutch 12. The proximal inner radial limiting protrusion 53 engages with the groove 43 of the push rod 4's disconnected first threaded body 41, controlling that the push rod sleeve 5 can always rotate synchronously with the push rod 4 and can move freely axially on the push rod 4. In addition, the axial position of the proximal end of the push rod sleeve 5 is close to the push rod nut 3, while the axial position of the distal end is restricted by the proximal end limiting part 66 of the pen body 6, so that the axial position of the push rod sleeve 5 is determined, allowing the push rod sleeve 5 to rotate while preventing the axial movement of the push rod sleeve 5.

[0121] Please continue to refer to this. Figure 16 and Figure 17 In some cases, the clutch 12 has a limiting flange 121, a barb 122, a first external thread 123, an axial rib 124, a clutch inner cylinder 125, a engagement protrusion 126, and a clutch outer cylinder 127. The clutch 12 is constrained within the dosing hub 7 by the engagement of the proximal symmetrical elastic arm 72 of the dosing hub 7 and the radial limiting groove 75 on the distal inner side of the dosing hub 7 with the distal limiting flange 121 of the clutch 12. The distal elastic barb 122 engages with the proximal axially protruding snap-fit ​​connector 132 of the button 13 to engage and fix the relative axial position of the injection button 13 and the clutch 12, while allowing rotation of both parts. The first external thread 123 engages with the inner first internal thread 112 of the limiting nut 11 to control the limiting nut 11 to always perform specific axial displacement and rotation according to the first external thread 123 of the clutch 12. Two symmetrical axial ribs 124 on the outer side of the clutch inner cylinder 125 engage with the symmetrical axial groove 52 extending from the middle to the distal end on the inner side of the push rod sleeve 5. This serves to restrict the push rod sleeve 5 from rotating synchronously with the clutch 12 and to allow axial displacement within the clutch 12. When the clutch 12 is in a position biased towards the proximal end within the dosing hub 7, the symmetrical longitudinal engagement protrusion 126 at the distal end engages with the longitudinal engagement spline 74 on the inner side of the distal end of the dosing hub 7 to achieve radial engagement between the two parts, thereby enabling synchronous rotation with the dosing hub 7.

[0122] Please refer to Figure 18 , Figure 18This is a schematic diagram of an injection button provided in an embodiment of this application. In some cases, the injection button 13 has a pressing part 131 and a locking connector 132. The distal pressing part 131 provides a better tactile feel when pressed by the user. The proximal axially protruding locking connector 132 engages with the distal elastic barb 122 of the clutch 12 to 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, the outer radial area of ​​the injection button 13 is partially shielded by the internal space of the distal radial control spline 76 of the dosing hub 7.

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

[0124] In this embodiment, the clutch 12 is designed with two main parts: an outer clutch cylinder 127 and an inner clutch cylinder 125. These two parts together constitute the basic structure of the clutch 12, and a space is formed between them to accommodate the push rod sleeve 5. The push rod sleeve 5 is located between the outer clutch cylinder 127 and the inner clutch cylinder 125. This arrangement 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 outer clutch sleeve 127 and the inner clutch sleeve 125 allows the push rod sleeve 5 to move and rotate axially within the clutch 12, which is crucial for 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 conjunction with other components of the injection mechanism 300 under the precise control of the clutch 12 to achieve precise injection of the drug solution.

[0126] In some embodiments, the outer side of the clutch inner cylinder 125 is provided with an axial rib 124, and the inner side of the push rod sleeve 5 is provided with an axial groove 52 that cooperates with the axial rib 124, so as 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 of the clutch 12 structure and mate with 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 engagement of the axial rib 124 and the axial groove 52 not only ensures the stability of the push rod sleeve 5 within the clutch 12, but also provides a mechanism that allows the push rod sleeve 5 to rotate precisely under the constraint of the clutch 12. This design allows the push rod sleeve 5 to rotate synchronously with the clutch 12 when needed, while maintaining its correct position and orientation, which is crucial for the function of the injection mechanism 300.

[0129] In some embodiments, the clutch 12 has a coupling protrusion 126 at its distal end. Specifically, the coupling protrusion 126 is located at the distal end of the clutch outer cylinder 127, and the coupling spline 74 is located at the distal end of the clutch 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 dosing hub 7, the engagement protrusion 126 couples with the engagement spline 74, and the dosing hub 7 moves toward the proximal end of the pen body 6 under the drive of the clutch 12; when the engagement protrusion 126 decouples from the engagement spline 74, the clutch 12 moves toward the distal end of the pen body 6 under the drive of the dosing hub 7.

[0131] In this embodiment, the outer cylinder portion of the clutch 12, namely the clutch outer cylinder 127, has a engagement protrusion 126 at its distal end. This protrusion is a key structure for achieving the mechanical connection between the clutch 12 and the dosing hub 7. Correspondingly, the distal end of the dosing hub 7 is designed with an engagement spline 74, which is a structure that mates with the engagement protrusion 126, allowing coupling or decoupling from the engagement protrusion 126 at different operating stages.

[0132] The interaction between the engagement protrusion 126 and the engagement spline 74 determines the coupling state between the clutch 12 and the dosing hub 7. When the clutch 12 needs to couple with the dosing hub 7, the clutch 12 moves towards the proximal end of the dosing hub 7, causing the engagement protrusion 126 and the engagement spline 74 to mesh together, forming a stable mechanical connection. This allows the dosing hub 7 to move towards the proximal end of the pen body 6 under the drive of the clutch 12. The movement of the dosing hub 7 includes both movement and rotation. This coupling state ensures that the rotational motion of the dosing hub 7 can be transmitted to the clutch 12, thereby affecting the movement of the push rod sleeve 5 and the push rod 4, achieving precise dosing injection.

[0133] Conversely, when the clutch 12 needs to be decoupled from the dosing hub 7, the engagement protrusion 126 separates from the engagement spline 74, so that the rotation of the dosing hub 7 no longer affects the operation of the clutch 12 and the injection mechanism 300. At this time, the clutch 12 moves towards the distal end of the pen body 6 under the drive of the dosing hub 7. The movement of the clutch 12 only includes lateral movement, and the clutch 12 does not rotate. This design allows unnecessary injection movements to be avoided when adjusting the dosage, improving the safety and operational flexibility of the injection pen.

[0134] In some embodiments, the spring arm 72 is located at the proximal end of the dosing hub 7, and the distal end of the dosing hub 7 is provided with a limiting groove 75. The movement position of the clutch 12 is limited by the spring arm 72 and the limiting groove 75.

[0135] Specifically, when the clutch 12 is coupled to the dosing hub 7, the proximal end of the clutch 12 pushes the spring arm 72, and the spring arm 72 separates from the feedback rib position 68, so that the spring arm 72 is deformed by the push of the injection mechanism 300 to separate from the feedback rib position 68; when the clutch 12 is decoupled from the dosing hub 7, the spring arm 72 remains in contact with the feedback rib position 68.

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

[0137] The primary function of the spring arm 72 is to provide feedback during dosage adjustment. When adjusting the dosage, the clutch 12 is decoupled from the dosage hub 7, and the spring arm 72 is no longer restricted by the clutch 12, allowing it to maintain contact with the feedback rib 68 of the pen body mechanism 100. This contact allows the spring arm 72 to generate feedback, such as tactile and audible feedback, as the dosage hub 7 rotates, providing the operator with an intuitive sense of dosage adjustment.

[0138] Conversely, during the injection operation, the clutch 12 couples with the dosing hub 7, and the proximal end of the clutch 12 pushes the spring arm 72, causing the spring arm 72 to separate from the feedback rib 68. This separation ensures that the spring arm 72 does not come into contact with the feedback rib 68 during injection, avoiding unnecessary sound or tactile feedback during injection, thereby reducing interference during the injection operation.

[0139] Therefore, the design of the spring arm 72 allows the pen to provide clear feedback when adjusting the dosage, but no feedback when injecting the medication, improving the ease of use and accuracy of the pen. This design cleverly distinguishes between adjustment and injection operations, ensuring a consistent user experience and precise operation at each stage of the pen's function.

[0140] In some embodiments, a spring piece 51 is provided on the outer side of the push rod sleeve 5, and the spring piece 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 incorporates an important functional component—the spring plate 51. Located on the outer side of the push rod sleeve 5, the spring plate 51 provides feedback during injection. When the injection mechanism 300 is coupled to the adjustment mechanism 200, and the push rod sleeve 5 rotates accordingly, the spring plate 51 contacts the pen body mechanism 100, generating injection feedback. This feedback mechanism allows the operator to feel the movement of the push rod sleeve 5 during injection, thus providing intuitive feedback on the injection operation.

[0142] Unlike the feedback provided by the spring arm 72 during dosage adjustment, the feedback from the spring plate 51 is specifically designed for the injection operation. During dosage adjustment, the contact between the spring arm 72 and the feedback rib 68 provides feedback on the dosage adjustment, allowing the operator to perceive the change. During the injection phase, the addition of the spring plate 51 ensures that the operator receives confirmation of the injection operation. This dual-feedback mechanism enhances the interactivity and accuracy of the injection pen.

[0143] Therefore, the design of the spring 51 allows the injection pen to provide direct feedback during drug injection, 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 at different stages of operation—adjustment and injection—ensuring 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 passes through the push rod nut 3 and is threadedly engaged with the push rod 4. The push rod nut 3 is provided with a ratchet hole 32, which restricts the unidirectional rotation of the spring piece 51. The spring piece 51 contacts the ratchet hole 32 when the push rod sleeve 5 rotates, generating feedback.

[0145] For information on pushrod nut 3, please refer to [link / reference]. Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the push rod nut provided in an embodiment of this application. Figure 5 A cross-sectional view of the push rod nut provided in an embodiment of this application.

[0146] In this embodiment, the design of the pen body mechanism 100 is further refined, particularly 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 has a push rod 4 inserted through it, and is connected to the push rod 4 via a threaded engagement. This threaded engagement allows the push rod 4 to move precisely within the push rod nut 3, which is crucial for controlling the axial position of the push rod 4.

[0147] The push rod nut 3 has a ratchet hole 32, a specially designed hole with ratchet teeth on its inner wall. The main function of the ratchet hole 32 is to restrict the rotation direction of the spring 51, ensuring that the spring 51 can only rotate in one direction, preventing it from rotating in the opposite direction when adjusting the injection pen. This restriction on unidirectional rotation is crucial for controlling the rotation of the push rod sleeve 5 and the movement of the push rod 4, as it ensures that the movement of the push rod 4 is controlled during injection and precisely corresponds to the dose set by the dosage hub 7.

[0148] As the pusher sleeve 5 rotates, the spring 51 contacts the ratchet hole 32, generating feedback. This feedback, provided during the injection operation, allows the operator to feel the movement of the pusher sleeve 5, thus obtaining intuitive feedback on the injection operation. This feedback mechanism not only improves the accuracy of the injection process but also enhances the operator's control over the injection pen and the safety of the operation.

[0149] Please continue to refer to this. Figure 4 and Figure 5 In some cases, the push rod nut 3 has a structure including mounting protrusions 31, ratchet holes 32, positioning grooves 33, connecting platforms 34, elastic arms 35, and a second internal thread 36. Four symmetrical mounting protrusions 31 at the distal end engage with four mounting holes 61 on the distal side of the pen body 6 to fix the push rod nut 3 in the axial and circumferential positions within the pen body 6. The central radial ratchet hole 32 has unidirectional teeth and engages with the symmetrical unidirectional spring pieces 51 at the proximal end of the push rod sleeve 5 to restrict the push rod sleeve 5 to rotate only in a fixed direction within the push rod nut 3, and emits an injection alert sound through indirect contact with the spring pieces 51. The laterally symmetrical positioning grooves 33 engage with the proximal inner positioning ribs 63 of the pen body 6 to provide guidance during assembly and restrict the radial position of the push rod nut 3 within the pen body 6. An elastic arm 35 is provided at the proximal end of the connecting platform 34. The proximal symmetrical elastic arm 35 is used to abut one end of the medicine bottle container 1 in an axial position. The second internal thread 36 in the middle engages with the first thread 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, the near end of the push rod nut 3 is provided with an elastic arm 35, which is used to hold the medicine bottle container 1 and to cushion the medicine bottle container 1 by means of the elasticity of the elastic arm 35; the outer side of the push rod nut 3 is provided with a positioning groove 33, and the inner side of the pen outer cylinder 69 is provided with a positioning rib 63 that cooperates with the positioning groove 33, so as to guide the push rod nut 3 into the pen body 6 and limit the circumferential position of the push rod nut 3; the far end of the push rod nut 3 is provided with a mounting protrusion 31, and the pen outer cylinder 69 is provided with a mounting hole 61 that cooperates with the mounting protrusion 31, so as to limit the axial and circumferential positions of the push rod nut 3.

[0151] In this embodiment, the design details of the pusher nut 3 are further clarified to ensure its function and positioning within the injection pen. The proximal end of the pusher nut 3 is equipped with a flexible arm 35, which directly contacts the vial container 1, providing stable support while also providing cushioning at the distal end. This design helps maintain the stability of the vial container 1 during injection, preventing it from moving or rotating under force, thereby ensuring the accuracy and consistency of the injection.

[0152] The pusher nut 3 has a positioning groove 33 on its outer side, which mates with the positioning rib 63 on the inner side of the pen outer cylinder 69. This mating not only guides the pusher nut 3 to be correctly inserted into the pen body 6, but also effectively restricts the rotation of the pusher nut 3 around the pen body 6, i.e., restricts its circumferential position. This precise positioning is crucial to ensuring that the pusher nut 3 and the associated pusher 4 can operate smoothly and accurately.

[0153] Furthermore, the distal end of the push rod nut 3 is designed with a mounting protrusion 31, which mates with the mounting hole 61 on the pen outer cylinder 69. This mating relationship restricts the axial movement of the push rod nut 3 along the pen body 6, thus limiting its axial position. This design ensures that the push rod nut 3 has a defined position within the pen body 6, providing the necessary structural support for the stable operation of the push rod 4.

[0154] In some embodiments, the push rod 4 has a first threaded body 41 on its outer side, which is threadedly engaged with the push rod nut 3; the push rod 4 has a mounting head 42 at its near end, which is connected to the push rod buckle 10; the push rod 4 has a groove 43 on its outer side that breaks the first threaded body 41 along the axial direction of the push rod 4; and the push rod sleeve 5 has a limiting protrusion 53 on its inner side that engages with the groove 43, so as to enable the push rod 4 to move 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, which allows it to be threadedly engaged with the push rod nut 3. This engagement allows the push rod 4 to make precise linear movement inside the push rod nut 3, responding to the dosage set by the adjustment mechanism 200, and realizing the injection of the drug solution.

[0156] The push rod 4 has a mounting head 42 at its proximal end, which is connected to the push rod latch 10. The push rod latch 10 directly contacts the rubber stopper 2 of the vial container 1 and pushes the rubber stopper 2 during injection, thereby controlling the injection of the medication. The mounting head 42 provides a secure connection point to ensure that the push rod 4 can transmit sufficient force when pushing the rubber stopper 2 of the vial container 1.

[0157] Furthermore, the outer side of the push rod 4 is provided with a groove 43 along its axial direction, which disconnects the first threaded body 41. The inner side of the push rod sleeve 5 is designed with a limiting protrusion 53 that mates with the groove 43. This design allows the push rod 4 to move freely within the push rod sleeve 5, while simultaneously rotating under the constraint of the push rod sleeve 5. The engagement of the limiting protrusion 53 and the groove 43 ensures the stability and controllability of the push rod 4 during movement, preventing improper movement or rotation of the push rod 4 within the push rod sleeve 5, which is crucial for precise control of the injection dosage.

[0158] Please refer to Figure 14 , Figure 14 This is a schematic diagram of the push rod clip provided in an embodiment of this application. In some cases, the push rod clip 10 has a clamp portion 101 and a flat portion 102. The clamp portion 101 engages with the mounting heads 42 on both sides of the push rod 4 to fix the push rod clip 10 in the axial position at the end of the push rod 4. The proximal flat portion 102 is close to the rubber stopper 2 of the medicine bottle container and serves as the contact surface for the injection pen to push the rubber stopper 2.

[0159] In some embodiments, the push rod nut 3 is located at the proximal end of the push rod sleeve 5, and the proximal end of the pen inner cylinder 65 is provided with a limiting part 66. The limiting part 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 part 66.

[0160] In this embodiment, the arrangement of the push rod nut 3 plays a crucial role in limiting the axial position of the push rod sleeve 5. The push rod nut 3 is positioned at the proximal end of the push rod sleeve 5 and works in conjunction with the limiting portion 66 at the proximal end of the pen inner cylinder 65. This arrangement forms two limiting points for the axial position of the push rod sleeve 5.

[0161] The push rod nut 3 acts as a fixed point, restricting the movement of the push rod sleeve 5 towards the proximal end of the pen body 6. This point is located on the first side of the spring piece 51, which means that the push rod sleeve 5 is axially positioned on the proximal end of the spring piece 51 by the action of the push rod nut 3. Meanwhile, the limiting part 66 is located on the second side of the spring piece 51, which means that the push rod sleeve 5 is axially positioned on the distal end of the spring piece 51 by the action of the limiting part 66 on the distal surface of the spring piece 51. In this way, the push rod sleeve 5 is firmly fixed inside the pen body 6, and its axial movement is effectively controlled, ensuring the stability and accuracy of the injection mechanism 300 during operation.

[0162] Furthermore, this structural design helps to provide a uniform force distribution during injection, reducing injection errors that may result from abnormal movement of the push rod sleeve 5. The combined use of the push rod nut 3 and the limiting part 66 improves the rigidity and reliability of the entire injection system, ensuring precise adjustment and injection of the dosage.

[0163] In some embodiments, the adjustment mechanism 200 further includes a limiting nut 11, the outer side of which is provided with a groove 111 and the inner side of which is provided with a first internal thread 112. The inner side of the dose hub 7 is provided with a limiting rib 73 that cooperates with the groove 111, so as to enable the limiting nut 11 to move on the dose hub 7 and rotate under the restriction of the dose hub 7. The outer side of the clutch outer cylinder 127 is provided with a first external thread 123 that is threadedly engaged with the first internal thread 112.

[0164] For information on limit nut 11, please refer to [link / reference]. Figure 15 , Figure 15 This is a schematic diagram of a limiting nut provided in an embodiment of this application.

[0165] In this embodiment, the adjustment mechanism 200 is further expanded to include a limiting nut 11, a key component for precisely controlling the movement and rotation of the dose hub 7. The limiting nut 11 has a groove 111 on its outer side, which allows certain parts of the dose hub 7 to engage with the limiting nut 11, thereby enabling the limiting nut 11 to move on the dose hub 7.

[0166] The limiting nut 11 has a first internal thread 112 on its inner side, which mates with the limiting rib 73 on the inner side of the dose hub 7. This mating relationship allows the limiting nut 11 to move freely on the dose hub 7 while rotating under the constraint of the dose hub 7. This design allows the limiting nut 11 to move along the thread of the dose hub 7 to adjust to the desired dose setting when adjusting the dose.

[0167] Furthermore, the outer side of the clutch outer cylinder 127 is provided with a first external thread 123, which mates with the first internal thread 112 of the limiting nut 11. This threaded engagement not only provides an additional fixing point for the limiting nut 11, but also allows for precise mechanical engagement between the clutch outer cylinder 127 and the limiting nut 11. This engagement is crucial for ensuring the stability and accuracy of the injection pen during dosage adjustment and injection.

[0168] Please continue to refer to this. Figure 15 In some cases, the limiting nut 11 has a groove 111 and a first internal thread 112. The outer symmetrical groove 111 engages with the inner symmetrical part 73 of the dosing hub 7 to ensure that the two parts can only rotate synchronously radially and that the limiting nut 11 can only move axially along the limiting rib 73. The inner first internal thread 112 engages with the first external thread 123 of the clutch 12 to control the limiting nut 11 to always perform specific axial displacement and rotation according to the thread 123 of the clutch 12.

[0169] In some embodiments, the outer side of the dosing hub 7 is provided with a third threaded body 71, and the inner side of the pen outer cylinder 69 is provided with a second threaded body 67 that is threadedly engaged with the third threaded body 71; the dosing hub 7 is provided with an identification print 77, and the pen outer cylinder 69 is provided with a window 64 to display the identification print 77; the proximal end of the dosing hub 7 is provided with a notch 78, which is used to abut against the second threaded body 67 to limit the maximum movement distance of the dosing hub 7 when it moves away from the pen body 6; the distal end of the dosing hub 7 is provided with a control spline 76, which is used to rotate the dosing hub 7.

[0170] For information on Dosage Hub 7, please refer to [link / reference]. Figure 10 and Figure 11 , Figure 10 This is a schematic diagram of the dose hub provided in an embodiment of this application. Figure 11 This is a full cross-sectional view of the dose hub provided in an embodiment of this application.

[0171] In this embodiment, the dosing hub 7 is designed with a third threaded body 71 on its outer side. This structure allows it to be threadedly engaged with a second threaded body 67 on the inner side of the pen outer cylinder 69. This threaded engagement allows the dosing hub 7 to make precise axial movement within the pen outer cylinder 69 while maintaining synchronous rotation with the pen outer cylinder 69, which is crucial for precise dose adjustment.

[0172] The dosing hub 7 also features markings 77 that provide visual indications of the dosing settings. To make these markings 77 visible, a window 64 is provided on the pen barrel 69. Through the window 64, the user can directly see the markings 77 on the dosing hub 7, thus easily reading the current dosing setting.

[0173] To limit the maximum distance the dosing hub 7 can move away from the pen body 6, a notch 78 is designed at the proximal end of the dosing hub 7. This notch 78 abuts against the second threaded body 67 inside the pen outer cylinder 69, forming a stopping point to prevent the dosing hub 7 from rotating excessively or moving out of the range of the pen outer cylinder 69.

[0174] In addition, the distal end of the dosing hub 7 is provided with a control spline 76, which is a structure for the user to manually rotate the dosing hub 7. By controlling the spline 76, the user can easily rotate the dosing hub 7 to adjust to the desired dose setting.

[0175] Please continue to refer to this. Figure 10 and Figure 11In some cases, the dosing hub 7 has a structure including a third threaded body 71, a spring arm 72, a limiting rib 73, a connecting spline 74, a limiting groove 75, a control spline 76, a marking print 77, and a notch 78. The outer third threaded body 71 engages with the two sections of the second threaded body 67 at the far end of the inner side of the pen body 6, ensuring that the dosing hub 7 can only move axially and rotate synchronously within the pen body 6 according to the thread pitch. The proximal spring arm 72 engages with the diamond-shaped feedback rib 68 extending axially from the outer side of the inner cylinder 65 of the pen body 6, so that it can make indirect contact with the pen body 6 to produce a sound when the dosing hub 7 rotates to adjust the dosage; the proximal symmetrical spring arm 72 restricts the clutch 12 to the proximal axial position inside the dosing hub 7. The inner axially symmetrical limiting rib 73 engages with the symmetrical groove 111 on the outer side of the limiting nut 11, so as to restrict the limiting nut 11 to rotate synchronously with the dosing hub 7 and move axially along the limiting rib 73. When the clutch 11 is in a proximal position within the dosing hub 7, the distal inner longitudinal engagement spline 74 engages radially with the distal longitudinal engagement protrusion 126 of the clutch, achieving synchronous rotation with the clutch 12. The distal inner radial limiting groove 75 engages with the distal limiting flange 121 of the clutch 12, limiting the clutch 11 to a distal position within the dosing hub 7. The distal outer control spline 76 facilitates user adjustment. The marking 77, displayed through the viewing window 64 at the distal end of the pen body 6, clearly indicates the current status of the injection pen to the user. The proximal notch 78 abuts against one of the two proximal sections of the second threaded body 67 on the distal end of the pen body 6, limiting the maximum axial displacement of the dosing hub 7 within the pen body 6.

[0176] In some embodiments, the pen body mechanism 100 includes a pen refill holder 9, which is connected to the pen body 6, and the pen refill holder 9 is used to mount the medicine bottle container 1 and the needle.

[0177] The injection pen also includes a pen cap 8, which is detachably connected to the pen refill holder 9.

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

[0179] Regarding pen cap 8, please refer to [link / reference]. Figure 12 , Figure 12 This is a schematic diagram of a pen cap provided in an embodiment of this application.

[0180] Regarding pen refill holder 9, please refer to [link / reference]. Figure 13 , Figure 13 This is a schematic diagram of a pen refill holder provided in an embodiment of this 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 serves the important function of mounting the medicine bottle container 1 and the needle. The design of the refill holder 9 allows it to securely fix the medicine bottle container 1, ensuring a stable delivery of the medication during injection. Simultaneously, the refill holder 9 is also used to mount disposable needles, enabling the injection pen to administer medication safely and hygienically.

[0182] In addition, the design of the injection pen includes a pen cap 8, which is a component 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, preventing contamination or accidental injury. The detachable connection to the refill holder 9 allows users to easily install or remove the pen cap 8 as needed, providing convenience and flexibility.

[0183] Please continue to refer to this. Figure 8 and Figure 9 In some cases, the pen body 6 has a structure including mounting holes 61, windows 62, positioning ribs 63, viewing windows 64, an inner pen barrel 65, a limiting part 66, a second threaded body 67, a feedback rib 68, and an outer pen barrel 69. The four distal mounting holes 61 engage 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 within the pen body 6. The four symmetrical windows 62 at the proximal end engage with the corresponding distal snaps 92 of the pen refill holder 9 to limit the radial and axial positions of the pen refill holder 9, thus fixing the pen refill holder 9 onto the pen body 6. The proximal inner positioning ribs 63 engage with the laterally symmetrical positioning grooves 33 of the push rod nut 3 to provide guidance during assembly and limit the radial position of the push rod nut 3 within the pen body 6. The markings 77 on the dosage hub 7 are displayed through the distal viewing window 64, allowing the user to clearly understand the current usage status of the injection pen. The proximal limiting part 66 abuts against the end of the push rod sleeve 5 to restrict the axial movement of the push rod sleeve 5 towards the distal end. The two inner distal ends of the second threaded body 67 engage with the outer third threaded body 71 of the dose hub 7, ensuring that the dose hub 7 can only move axially and rotate synchronously within the pen body 6 according to the thread pitch; the proximal end of the two inner distal ends of the second threaded body 67 abuts against the proximal notch 78 of the dose hub 7 to limit the maximum axial displacement of the dose hub 7 within the pen body 6. The diamond-shaped feedback rib 68 extending axially from the outer side of the inner cylinder 65 engages with the proximal spring arm 72 of the dose hub 7, so that it can make indirect contact with the pen body 6 to produce sound when the dose hub 7 is rotated for dose adjustment.

[0184] Please continue to refer to this. Figure 12In some cases, the pen cap 8 has a structure including a clip 81, a cap opening groove 82, a cap recess 83, and a body 84. The clip 81 allows the user to conveniently clip the injection pen into their pocket and also provides an anti-roll feature. When the pen cap 8 is connected to the refill holder 9, the cap opening groove 82 mates with the surface of the refill holder 9. The distal inner edge annular cap recess 83 engages with the distal positioning block 91 of the refill holder 9, allowing the pen cap 8 to be axially positioned on the refill holder 9 at any angle in the circumferential direction; the limiting groove 83 of the annular recess provides radial positioning. The body 84 can fully accommodate the proximal part of the refill holder 9 with the needle installed.

[0185] Please continue to refer to this. Figure 13 In some cases, the pen refill holder 9 has a structure including a positioning block 91, a snap fastener 92, a refill viewing window 93, and a threaded interface 94. The distal positioning block 91 engages with the annular cap groove 83 on the inner edge of the distal end of the pen cap, allowing the pen cap 8 to be axially positioned on the pen refill holder 9 at any radial angle. The distal corresponding snap fastener 92 engages with the four symmetrical windows 62 on the proximal end of the pen body 6, used to limit the radial and axial positions of the pen refill holder 9 and fix it to the pen body 6. The refill viewing window 93 allows the user to observe the position of the rubber stopper 2 inside the medicine bottle container 1 to understand the usage status. The proximal threaded interface 94 is used to install disposable needles.

[0186] In some embodiments, the pen refill holder 9 has a threaded interface 94 at its proximal end for mounting a needle; the pen refill holder 9 has a buckle 92 at its distal end, and the pen outer cylinder 69 has a window 62 that engages with the buckle 92 to limit the axial and circumferential positions of the pen refill holder 9; the pen refill holder 9 has a pen refill viewing window 93 through which the position of the rubber stopper 2 inside the medicine bottle container 1 can be observed; the pen refill holder 9 has a positioning block 91 on its outer side, and the pen cap 8 has a cap groove 83 that engages with the positioning block 91 to limit the axial position of the pen cap 8.

[0187] In this embodiment, the structural design of the pen refill holder 9 is refined to ensure its stability and functionality within the injection pen. The proximal end of the pen refill holder 9 is designed with a threaded interface 94, specifically for mounting needles, ensuring a secure connection of the needle to the injection pen while facilitating the replacement or installation of new needles.

[0188] The distal end of the pen refill holder 9 is provided with a latch 92, which engages with the window 62 on the pen outer barrel 69. Through this engagement, the axial and circumferential positions of the pen refill holder 9 are effectively restricted, ensuring the stability of the pen refill holder 9 within the pen body 6 and preventing displacement or rotation during use, which is crucial for ensuring the accuracy of the injection dosage.

[0189] The pen refill holder 9 also features a refill viewing window 93, which allows users to directly observe the position of the rubber stopper 2 inside the vial container 1, thereby monitoring the remaining amount of medication and the injection status. This intuitive visual feedback is extremely useful for the operator, as it provides immediate information about the status of the injection pen.

[0190] In addition, a positioning block 91 is provided on the outer side of the pen refill holder 9, which 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 pen refill holder 9, while making it easy for users to remove or install the pen cap 8 as needed, thus increasing the convenience of use.

[0191] Please refer to Figure 19 and Figure 20 , Figure 19 This is an assembly diagram of a feedback-optimized injection pen provided in an embodiment of this application. Figure 20 A diagram illustrating the use of a feedback-optimized injection pen provided in an embodiment of this application.

[0192] In one specific embodiment, the feedback-optimized injection pen provided in this application is a pre-filled drug injection pen with adjustable dosage and multiple uses. It includes 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 refill holder 9. Injection can be performed by rotating the dosage hub 7 and pressing the injection button 13. This solution differs from similar products currently on the market in its component structure and parts fit. The design of the pen body 6 and the dosage hub 7 makes the tactile feedback and sound when adjusting the dosage more precise and easier to adjust, eliminating the need for other products that require multiple parts and springs to achieve the same effect.

[0193] The dosing hub 7 has at least two internal limiting ribs 73, a proximal spring arm 72, a third threaded body 71, and a proximal radial control spline 76. The clutch 12, as a braking component, has a distally radially extending limiting flange 121, at least one radially protruding axial rib 124, and at least one longitudinal engagement protrusion 126. The push rod sleeve 5, as a driving component, includes: at least one internal radial-axial groove 52 that engages at least one internal axial rib 124 of the clutch 12; at least one limiting protrusion 53 that engages two channels 43 of the push rod 4; and a proximal spring 51 that engages several internal longitudinal ribs 32 of the push rod nut 3.

[0194] The dosing hub 7 includes a control spline 76, which the user rotates to set the desired dose. The dosing hub 7 also includes a marking 77 with multiple numbers corresponding to multiple dose units visible in the window 64 on the pen body 6. The user rotates the dosing 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 fully injected. Injection completion is confirmed when the marking 77 on the dosing hub 7 displays 0 in the window 64 on the pen body 6.

[0195] During dosage setting and dosage calibration, the clutch 12 moves axially together with the dosage hub 7, but the clutch 12 does not rotate. At the same time, the push rod sleeve 5 has no rotational kinetic energy, so the push rod 4 does not move axially or rotate. The dosage adjustment sound is generated by the indirect contact between the spring arm 72 of the dosage hub 7 and the feedback rib 68 of the pen body 6. During injection, the clutch 12 moves axially and rotates together with the dosage hub 7, and at the same time drives the push rod sleeve 5 to drive the push rod 4 to generate rotational kinetic energy. Therefore, the push rod 4 will make axial movement through the push rod nut 3 to discharge the drug. The injection sound is generated 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 Figure 21 , Figure 21 The first state diagram of the feedback-optimized injection pen provided in the embodiments of this application.

[0197] Figure 21 An exemplary embodiment of this application is shown, in which, when the user rotates the dosing hub 7 to adjust the dosage (injection button 13 is not pressed proximally), 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 unidirectional rotation of the push rod sleeve 5; the distal limiting flange 121 of the clutch 12 abuts against the distal inner limiting groove 75 of the dosing hub 7, and the proximal end of the clutch 12 abuts against the inner spring arm 72 of the dosing hub 7, thereby limiting the clutch 12 in the dosing hub 7 to always be in a position relatively biased towards the distal end. As shown, when the dosing hub 7 is rotated, its proximal spring arm 72 will make intermittent contact with the feedback rib 68 inside the pen body 6, so as to produce the feel and sound when adjusting the dosage.

[0198] Please refer to Figure 22 , Figure 22 The second state diagram of the feedback-optimized injection pen provided in the embodiments of this application.

[0199] Figure 22An exemplary embodiment of this application is shown. When the user presses the injection button 13, the clutch 12 moves towards the proximal end of the relative axial position in the dosage hub 7. At this time, the engagement protrusion 126 at the distal end of the clutch 12 engages with the engagement spline 74 inside the distal end of the dosage hub 7, forcing the clutch 12 to rotate synchronously with the dosage hub 7. The inner spring arm 72 at the proximal end of the dosage hub 7 deforms inward, thereby reducing the sound produced by the rotation of the dosage hub 7 and the feedback rib 68 inside the pen body 6. As the clutch 12 rotates, it drives the push rod sleeve 5 to rotate synchronously, so the push rod 4 rotates with the push rod sleeve 5 to dispense the required dose. The symmetrical spring piece 51 at the proximal end of the push rod sleeve 5 cooperates with the radial ratchet hole 32 inside the push rod nut 3 to produce intermittent contact, thereby generating the feel and sound when injecting the dose.

[0200] Please refer to Figure 23 , Figure 23 The third state diagram of the feedback-optimized injection pen provided in the embodiments of this application.

[0201] Figure 23 An exemplary embodiment of this application is shown. When the clutch 12 is not rotating synchronously with the dosing hub 7 (dose adjustment), the limiting nut 11 rotates with the dosing hub 7. The first internal thread 112 of the limiting nut 11 generates a corresponding axial displacement (increasing the dose) or a proximal displacement (decreasing the dose) with the first external thread 123 of the clutch 12. The magnitude of the displacement is determined by the pitch on the clutch 12. When the limiting nut 11 rotates to the farthest end of the clutch 12 thread, it restricts further rotation of the dosing hub 7, preventing the user from further adjusting the dose by rotating it to the farthest end. During injection, since the clutch 12 rotates synchronously with the dosing hub 7, the limiting nut 11 remains at the axial position on the clutch 12 before injection.

[0202] Please refer to Figure 24 , Figure 24 The fourth state diagram of the feedback-optimized injection pen provided in the embodiments of this application.

[0203] Figure 24 An exemplary embodiment of this application is shown, in which, when a user rotates the dose hub 7 toward the distal end to adjust the maximum dose, the notch 78 at the proximal end of the dose hub 7 touches the second threaded body 67 at the distal end of the pen body 6, wherein the proximal side prevents the dose hub 7 from continuing to rotate axially toward the distal end, thereby limiting the user from further increasing the dose.

[0204] It should be noted that many of the components mentioned in this application are general standard parts or components known to those skilled in the art, and their structure and principle 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 used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0206] The above provides a detailed description of the feedback-optimized injection pen provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A feedback-optimized injection pen, characterized in that, This includes the pen body mechanism, adjustment mechanism, and injection mechanism; The pen body mechanism includes a pen body, which has an outer cylinder and an inner cylinder, and the outer side of the inner cylinder is provided with a feedback rib. The adjustment mechanism includes a dose hub, the outer side of which is threaded into the outer cylinder of the pen. The dose hub is provided with a spring arm, which contacts the feedback rib when the dose hub rotates to generate feedback. The injection mechanism and the adjustment mechanism have two states: coupling and decoupling. When the injection mechanism and the adjustment mechanism are coupled, the injection mechanism pushes the liquid medicine in the medicine bottle container under the action of the adjustment mechanism. The elastic arm is used to deform under 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 remains in contact with the feedback rib.

2. The feedback-optimized injection pen according to claim 1, characterized in that, The injection mechanism includes: The clutch is located inside the dosing hub. The clutch is rotatable and movable. The clutch is connected to an injection button located at the far end of the pen body mechanism. The clutch and the dosing hub have two states: coupling and decoupling, depending on the different moving positions of the clutch. A push rod sleeve is disposed inside the clutch, and the push rod sleeve rotates under the restriction of the clutch. A push rod is located inside the push rod sleeve. The push rod is movable and rotates under the restriction of the push rod sleeve. The push rod is threadedly engaged with the pen body mechanism. A push rod buckle is provided at the proximal end of the push rod. The push rod buckle is used to push the rubber stopper of the medicine bottle container.

3. The feedback-optimized injection pen according to claim 2, characterized in that, The clutch has an outer clutch cylinder and an inner clutch cylinder, and the push rod sleeve is provided between the outer clutch cylinder and the inner clutch cylinder.

4. The feedback-optimized injection pen according to claim 3, characterized in that, The outer side of the clutch inner cylinder is provided with an axial rib, and the inner side of the push rod sleeve is provided with an axial groove that mates with the axial rib, so as to enable the push rod sleeve to rotate under the restriction of the clutch.

5. The feedback-optimized injection pen according to claim 2, characterized in that, The clutch has a coupling protrusion at its distal end, and the dosing hub has a coupling spline at its distal end. The coupling protrusion and the coupling spline have two states: coupling and decoupling, at different moving positions of the clutch. When the clutch moves toward the proximal end of the dosing hub, the engagement protrusion couples with the engagement spline, and the dosing hub moves toward the proximal end of the pen body under the drive of the clutch; when the engagement protrusion decouples from the engagement spline, the clutch moves toward the distal end of the pen body under the drive of the dosing hub.

6. The feedback-optimized injection pen according to claim 2, characterized in that, The spring arm is located at the proximal end of the dosing hub, and the distal end of the dosing hub is provided with a limiting groove. The movement position of the clutch is limited by the spring arm and the limiting groove. When the clutch is coupled to the dose hub, the proximal end of the clutch pushes the spring arm, and the spring arm separates from the feedback rib; when the clutch is decoupled from the dose hub, the spring arm remains in contact with the feedback rib.

7. The feedback-optimized injection pen according to claim 2, characterized in that, The outer side of the push rod sleeve is provided with a spring plate, which contacts the pen body mechanism to generate feedback when the push rod sleeve rotates.

8. The feedback-optimized injection pen according to claim 7, characterized in that, The pen body mechanism includes a push rod nut, which is connected to the pen body. The push rod is threaded through the push rod nut and is threaded with the push rod. The push rod nut has a ratchet hole, which restricts the unidirectional rotation of the spring. The spring and the ratchet hole contact each other when the push rod sleeve rotates to generate feedback.

9. The feedback-optimized injection pen according to claim 8, characterized in that, The near end of the push rod nut is provided with an elastic arm, which is used to hold the medicine bottle container and to cushion the medicine bottle container by means of the elasticity of the elastic arm; the outer side of the push rod nut is provided with a positioning groove, and the inner side of the pen outer tube is provided with a positioning rib that cooperates with the positioning groove, so as to guide the push rod nut into the pen body and restrict the circumferential position of the push rod nut; the far end of the push rod nut is provided with a mounting protrusion, and the pen outer tube is provided with a mounting hole that cooperates with the mounting protrusion, so as to restrict the axial and circumferential positions of the push rod nut.

10. The feedback-optimized injection pen according to claim 8, characterized in that, The push rod has a first threaded body on its outer side, which is threadedly engaged with the push rod nut; the push rod has a mounting head near its proximal end, which is connected to the push rod buckle; the push rod has a groove on its outer side that disconnects the first threaded body along the axial direction of the push rod, and the push rod sleeve has a limiting protrusion on its inner side that engages with the groove, so as to enable the push rod to move within the push rod sleeve and rotate under the restriction of the push rod sleeve.

11. The feedback-optimized injection pen according to claim 8, characterized in that, The push rod nut is located at the near end of the push rod sleeve, and a limiting part is provided at the near end of the pen inner cylinder. The limiting part is located on the side of the spring piece away from the near 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 part.

12. The feedback-optimized injection pen according to claim 3, characterized in that, The adjustment mechanism also includes a limiting nut, the outer side of which is provided with a groove, and the inner side of which is provided with a first internal thread. The inner side of the dosing hub is provided with a limiting rib that cooperates with the groove, so as to enable the limiting nut to move on the dosing hub and rotate under the restriction of the dosing hub. The outer side of the clutch outer cylinder is provided with a first external thread that cooperates with the first internal thread.

13. The feedback-optimized injection pen according to claim 1, characterized in that, The outer side of the dosing hub is provided with a third threaded body, and the inner side of the pen outer cylinder is provided with a second threaded body that is threadedly engaged with the third threaded body; the dosing hub is provided with a marking print, and the pen outer cylinder is provided with a viewing window to display the marking print; the proximal end of the dosing hub is provided with a notch, which is used to abut against the second threaded body to limit the maximum movement distance of the dosing hub away from the pen body; the distal end of the dosing hub is provided with a control spline, through which the dosing hub is rotated.

14. The feedback-optimized injection pen according to claim 1, characterized in that, The pen body mechanism includes a pen refill holder, which is connected to the pen body. The pen refill holder is used to install a cartridge medicine bottle container and a needle. The injection pen also includes a pen cap, which is detachably connected to the pen refill holder.

15. The feedback-optimized injection pen according to claim 14, characterized in that, The pen refill holder has a threaded interface at its proximal end for mounting a needle; a snap fastener is located at its distal end, and the outer cylinder of the pen has a window that engages with the snap fastener to restrict the axial and circumferential positions of the pen refill holder; the pen refill holder has a pen refill viewing window through which the position of the rubber stopper inside the medicine bottle container can be observed; a positioning block is located on the outer side of the pen refill holder, and the pen cap has a cap groove that engages with the positioning block to restrict the axial position of the pen cap.

Images