Feedback optimized injection pen

Abstract

The application discloses a feedback-optimized injection pen, relates to the technical field of medical devices, and discloses the following technical scheme. A push rod nut is arranged on a pen body, and the push rod nut is provided with an elastic cantilever. An injection mechanism comprises a push rod sleeve and a push rod. When the push rod sleeve rotates relative to the pen body, the axial position of the push rod sleeve is positioned by a push rod nut positioning shaft. The push rod sleeve is provided with a one-way gear disc. The one-way gear disc is in contact with the elastic cantilever, the one-way rotation of the push rod sleeve is limited, and the push rod sleeve feeds back sound when rotating. The push rod is arranged on the push rod sleeve, the push rod is in threaded connection with the push rod nut, the push rod is driven to rotate by the push rod sleeve, and the push rod moves under the action of the threads of the push rod nut, so that the liquid medicine in a push injection card type bottle is injected. The feedback-optimized injection pen is characterized in that the one-way gear disc is arranged on the push rod sleeve and is in contact with the elastic cantilever, the one-way rotation of the push rod sleeve is limited, and the push rod sleeve feeds back sound when rotating. The problem that the injection feedback of the existing injection pen is not accurate enough is effectively solved, and the accuracy and reliability of the injection dose are improved.

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 cartridge, and a pen body. Through a dosage adjustment mechanism, it allows the operator to set the injection dose as needed.

[0003] In practice, the inventors discovered that existing injection pens have some shortcomings. The injection feedback of the pens is not precise enough because there is a risk of reverse rotation during injection, making it difficult for users to judge whether the injection dosage is accurate based solely on the injection sound. Summary of the Invention

[0004] The purpose of this application is to provide a feedback-optimized injection pen. By setting a one-way toothed disc on the push rod sleeve that contacts an elastic cantilever, the unidirectional rotation of the push rod sleeve is restricted, and sound is emitted as feedback during rotation. This effectively solves the problem of insufficient injection feedback in existing injection pens and improves the accuracy and reliability of injection dosage.

[0005] To achieve the above objectives, this application provides a feedback-optimized injection pen, comprising:

[0006] Pen body;

[0007] A push rod nut is provided on the pen body, and the push rod nut is provided with a flexible cantilever.

[0008] Injection facilities, including:

[0009] A push rod sleeve, which is positioned axially by a push rod nut when rotating relative to the pen body. The push rod sleeve is provided with a one-way toothed disc, which contacts the elastic cantilever to restrict the one-way rotation of the push rod sleeve and generate sound feedback when rotating.

[0010] A push rod is provided in the push rod sleeve. The push rod is threadedly connected to the push rod nut. The push rod is driven to rotate by the push rod sleeve and moves under the action of the thread of the push rod nut to push the liquid medicine in the cartridge bottle.

[0011] In some embodiments, the number of elastic cantilevers is multiple, and the multiple elastic cantilevers are symmetrically arranged in the circumferential direction of the push rod nut;

[0012] The unidirectional gear plate is located at the near end of the push rod sleeve.

[0013] In some embodiments, the distal end of the push rod nut is provided with the elastic cantilever and the first clamping arm; the proximal end face of the push rod sleeve abuts against the distal end face of the push rod nut, the proximal outer periphery of the push rod sleeve is clamped by the first clamping arm, and the elastic cantilever is located between the proximal end face of the push rod sleeve and the first clamping arm.

[0014] In some embodiments, the proximal end of the push rod nut is provided with a positioning spring, which is used to position the axial position of the cartridge bottle and provide cushioning for the cartridge bottle; and / or,

[0015] The pen body is provided with a first positioning hole; the distal end of the push rod nut is provided with a first protrusion, which cooperates with the first positioning hole.

[0016] In some embodiments, the feedback-optimized injection pen further includes:

[0017] A refill holder is provided on the pen body, and the interior of the refill holder is used to install a cartridge bottle;

[0018] The pen body has a second positioning hole at its near end; the pen refill holder has a second protrusion at its far end, and the second protrusion engages with the second positioning hole.

[0019] In some embodiments, the injection mechanism further includes:

[0020] The clutch is rotatably disposed inside the pen body. The clutch is used to drive the push rod sleeve to rotate. The clutch is axially movable.

[0021] A dosing drum is threadedly connected to the pen body. The dosing drum has a clutch inside. The dosing drum and the clutch have two states: abutting coupling and disengagement decoupling, depending on the different moving positions of the clutch.

[0022] An injection button is rotatably disposed on the clutch, and the injection button protrudes from the distal end.

[0023] In some embodiments, the inner wall of the pen body is provided with multiple sets of sound-emitting ribs, and the multiple sets of sound-emitting ribs are distributed along the inner periphery of the pen body;

[0024] The proximal end of the dosage drum is provided with a sound-emitting protrusion, which contacts the sound-emitting rib and emits sound feedback when the dosage drum rotates.

[0025] In some embodiments, the proximal end of the dosing drum is provided with a limiting spring arm, and the distal end of the dosing drum is provided with a limiting groove and a linkage spline;

[0026] The clutch has a linkage protrusion at its distal end. The range of movement of the clutch in the dosage drum is limited by the limiting spring arm and the limiting groove. When the clutch moves toward the proximal end, the linkage spline abuts against the linkage protrusion to achieve coupling between the clutch and the dosage drum.

[0027] In some embodiments, the sound-emitting protrusion is located on the outside of the limiting spring arm;

[0028] The limiting spring arm is elastic and can deform under the compression of the proximal end of the clutch;

[0029] Before the limiting spring arm reaches the set deformation, the limiting spring arm supports the clutch, causing the linkage protrusion to separate from the linkage spline, while the sound-generating protrusion remains in contact with the sound-generating rib.

[0030] After the limiting spring arm reaches the set deformation, the linkage protrusion abuts against the linkage spline, and the sound-generating protrusion tilts up and disengages from the sound-generating rib.

[0031] In some embodiments, the feedback-optimized injection pen further includes:

[0032] A limiting nut is provided on the clutch and nested inside the dosing drum. The outer side of the limiting nut is provided with a guide groove for the guide rib on the inner side of the dosing drum to be inserted, so as to realize the axial movement of the limiting nut. The inner side of the limiting nut is provided with a second internal thread, which is used to connect with the second external thread on the outer side of the clutch.

[0033] Compared to the aforementioned background technology, the feedback-optimized injection pen provided in this application mainly includes a pen body, a push rod nut, and an injection mechanism. The push rod nut is located on the pen body and has an elastic cantilever. The injection mechanism includes a push rod sleeve and a push rod. When the push rod sleeve rotates relative to the pen body, its axial position is positioned by the push rod nut. The push rod sleeve has a one-way toothed disc that contacts the elastic cantilever, restricting the unidirectional rotation of the push rod sleeve and providing feedback sound during rotation. The push rod is located on the push rod sleeve and is threadedly connected to the push rod nut. The push rod is driven to rotate by the push rod sleeve and moves under the action of the push rod nut's thread to inject the liquid medicine from the cartridge vial.

[0034] In use, the injection mechanism rotates the push rod by rotating the push rod sleeve. The push rod sleeve converts the motion of the push rod, enabling it to move and thus inject the medication. The rotation angle of the push rod sleeve corresponds to the distance the push rod moves, which in turn corresponds to the amount of medication injected.

[0035] A major problem with existing injection pen technology is the lack of precise injection feedback. This is because the plunger sleeve may rotate in the opposite direction during injection, making it difficult for users to accurately judge whether the dosage is correct based solely on the sound of the injection. This inaccuracy can lead to inaccurate drug dosage, affecting treatment effectiveness or posing potential health risks.

[0036] To address this issue, the feedback-optimized injection pen provided in this application improves the accuracy and reliability of injection dosage through a series of innovative designs. The push rod nut is equipped with elastic cantilever arms that contact a one-way toothed disc on the push rod sleeve. Simultaneously, when the push rod sleeve rotates relative to the pen body, the push rod nut uses these elastic cantilever arms to position its axial position. This design ensures the axial stability of the push rod sleeve and reduces dosage errors caused by reverse rotation.

[0037] More importantly, the contact between the one-way toothed disc on the push rod sleeve and the flexible cantilever not only restricts the reverse rotation of the push rod sleeve, but also generates audible feedback through interaction with the flexible cantilever during unidirectional rotation of the push rod sleeve. This audible feedback provides the user with a clear signal that the injection dose is being delivered accurately. Because the one-way toothed disc restricts the reverse rotation of the push rod sleeve, any audible feedback corresponds to forward dose delivery, thus eliminating the uncertainty caused by reverse rotation.

[0038] 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: By setting a one-way toothed disc on the push rod sleeve to contact the elastic cantilever, the one-way rotation of the push rod sleeve is restricted, and sound is emitted during rotation, which effectively solves the problem of insufficient injection feedback in existing injection pens and improves the accuracy and reliability of injection dosage. Attached Figure Description

[0039] 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.

[0040] Figure 1 A schematic diagram of a feedback-optimized injection pen provided in an embodiment of this application;

[0041] Figure 2 An exploded view of the feedback-optimized injection pen provided in the embodiments of this application;

[0042] Figure 3A cross-sectional view of a feedback-optimized injection pen provided in an embodiment of this application;

[0043] Figure 4 A schematic diagram of the push rod nut and push rod sleeve provided in the embodiments of this application;

[0044] Figure 5 A schematic diagram of the pen body, push rod nut, and pen refill holder provided for embodiments of this application;

[0045] Figure 6 A schematic diagram of a pen refill holder provided in an embodiment of this application;

[0046] Figure 7 A schematic diagram of the push rod and push rod nut provided in the embodiments of this application;

[0047] Figure 8 A schematic diagram of the push rod and push rod buckle provided in the embodiments of this application;

[0048] Figure 9 A schematic diagram of the push rod and push rod sleeve provided in the embodiments of this application;

[0049] Figure 10 A schematic diagram of the push rod sleeve provided in an embodiment of this application;

[0050] Figure 11 A schematic diagram of the push rod sleeve and clutch provided in the embodiments of this application;

[0051] Figure 12 A schematic diagram of the clutch and dosing drum provided in an embodiment of this application;

[0052] Figure 13 Another schematic diagram of the clutch and dosing drum provided in the embodiments of this application;

[0053] Figure 14 A schematic diagram of the dosing drum provided in the embodiments of this application;

[0054] Figure 15 A schematic diagram of the dosing drum and pen body provided for an embodiment of this application;

[0055] Figure 16 A schematic diagram of the pen body provided for an embodiment of this application;

[0056] Figure 17 A schematic diagram of the clutch and injection button provided in an embodiment of this application;

[0057] Figure 18 This is a structural diagram of the limiting nut and clutch provided in an embodiment of this application;

[0058] Figure 19 This is a structural diagram of the limiting nut and the dosing drum provided in the embodiments of this application.

[0059] in:

[0060] Cartridge bottle 1

[0061] Rubber stopper 2

[0062] 3. Push rod nut, 31. First protrusion, 32. First clamping arm, 33. First internal thread, 35. Positioning spring, 36. Elastic cantilever.

[0063] Push rod 4, push rod thread 41, connector 42, moving surface 43

[0064] 5. Push rod sleeve; 51. One-way gear plate; 52. Positioning step; 53. Limiting block; 54. Notched flange.

[0065] Pen body 6, first positioning hole 61, sound-emitting rib 62, threaded body 63, first viewing window 64, second positioning hole 65

[0066] 7. Dosing drum; 71. First external thread; 72. Limiting spring arm; 73. Guide rib; 74. Linkage spline; 75. Limiting groove; 76. Spline knob; 77. Dosing indicator; 78. Limiting window; 79. Sound-emitting protrusion.

[0067] Pen refill holder 8, second protrusion 81, positioning shoulder 82, clearance groove 83, second viewing window 84, threaded interface 85.

[0068] Push rod latch 9, caliper plate 91, push surface 92

[0069] Limit nut 10, guide groove 101, second internal thread 102

[0070] Clutch 11, Positioning flange 111, Linkage protrusion 112, Second external thread 113, Linkage rib 114, Mounting hook 115

[0071] Injection button 12, button surface 121, mounting step 122. Detailed Implementation

[0072] 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.

[0073] 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.

[0074] Please refer to Figures 1 to 4,in, Figure 1 This is a schematic diagram of a feedback-optimized injection pen provided in an embodiment of this application. Figure 2 This is an exploded view of the feedback-optimized injection pen provided in the embodiments of this application. Figure 3 This is a cross-sectional view of the feedback-optimized injection pen provided in the embodiments of this application. Figure 4 This is a schematic diagram of the push rod nut and push rod sleeve provided in the embodiments of this application.

[0075] In a first specific embodiment, the feedback-optimized injection pen provided in this application mainly includes a pen body 6, a push rod nut 3, and an injection mechanism. The push rod nut 3 is located on the pen body 6 and has an elastic cantilever 36. The injection mechanism includes a push rod sleeve 5 and a push rod 4. When the push rod sleeve 5 rotates relative to the pen body 6, its axial position is positioned by the push rod nut 3. The push rod sleeve 5 has a one-way toothed disc 51, which contacts the elastic cantilever 36, restricting the one-way rotation of the push rod sleeve 5 and providing feedback sound during rotation. The push rod 4 is located on the push rod sleeve 5 and is threadedly connected to the push rod nut 3. Specifically, the push rod 4 has an external thread, and the push rod nut 3 has an internal thread. The push rod 4 is driven to rotate by the push rod sleeve 5 and moves under the action of the thread of the push rod nut 3 to inject the liquid medicine in the cartridge bottle 1.

[0076] In use, the injection mechanism drives the push rod 4 to rotate by rotating the push rod sleeve 5. The push rod sleeve 5 converts the movement of the push rod 4, enabling the push rod 4 to move and thus inject the drug solution. The rotation angle of the push rod sleeve 5 corresponds to the movement distance of the push rod 4, and thus corresponds to the injection volume of the drug solution.

[0077] A major problem with existing injection pen technology is the lack of precise injection feedback. This is because the plunger sleeve 5 may rotate in the opposite direction during injection, making it difficult for the user to accurately judge whether the injection dosage is correct based solely on the sound. This inaccuracy may lead to inaccurate drug dosage, thereby affecting treatment effectiveness or posing potential health risks.

[0078] To address this issue, the feedback-optimized injection pen provided in this application improves the accuracy and reliability of injection dosage through a series of innovative designs. The push rod nut 3 is equipped with elastic cantilever arms 36, which contact the one-way toothed disc 51 on the push rod sleeve 5. Simultaneously, when the push rod sleeve 5 rotates relative to the pen body 6, the push rod nut 3 uses these elastic cantilever arms 36 to position its axial position. This design ensures the axial stability of the push rod sleeve 5 and reduces dosage errors caused by reverse rotation.

[0079] More importantly, the contact between the one-way toothed disc 51 on the push rod sleeve 5 and the elastic cantilever 36 not only restricts the reverse rotation of the push rod sleeve 5, but also generates audible feedback through interaction with the elastic cantilever 36 during unidirectional rotation of the push rod sleeve 5. This audible feedback provides the user with a clear signal that the injection dose is being delivered accurately. Because the one-way toothed disc 51 restricts the reverse rotation of the push rod sleeve 5, any audible feedback corresponds to forward dose delivery, thus eliminating the uncertainty caused by reverse rotation.

[0080] 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: By setting a one-way toothed disc 51 on the push rod sleeve 5 to contact the elastic cantilever 36, the one-way rotation of the push rod sleeve 5 is restricted, and sound is emitted during rotation, which effectively solves the problem of insufficient injection feedback in existing injection pens and improves the accuracy and reliability of injection dosage.

[0081] 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.

[0082] Please continue to refer to this. Figure 4 In some embodiments, there are multiple elastic cantilever arms 36, which are symmetrically arranged in the circumferential direction of the push rod nut 3.

[0083] One-way gear plate 51 is located at the near end of push rod sleeve 5.

[0084] In this embodiment, the elastic cantilever 36 is designed with multiple symmetrical arrangements, meaning the number of elastic cantilever 36 can be [number missing]. Figure 4 The arrangement of two, three, or more elastic cantilevers 36, compared to a single elastic cantilever 36 or multiple elastic cantilevers 36 arranged asymmetrically, helps to achieve stable positioning of the push rod nut 3 within the pen body 6 and ensures that the elastic cantilevers 36 can contact the unidirectional gear plate 55 evenly when the push rod sleeve 5 rotates. Symmetrical elastic cantilevers 36 provide balanced elastic force, making the axial positioning of the push rod nut 3 more accurate, and also contributing to the smoothness and uniformity of the push rod sleeve 5 during rotation.

[0085] A one-way toothed disc 55 is located near the proximal end of the push rod sleeve 5. The contact point between the one-way toothed disc 55 and the elastic cantilever 36 is a lever arm distance from the rotation center of the push rod sleeve 5, satisfying the requirement that the push rod sleeve 5 prevents rotation when not subjected to rotational force. Because the contact between the one-way toothed disc 55 and the elastic cantilever 36 is near the proximal end of the push rod sleeve 5, a larger contact area and better force transmission efficiency are provided, resulting in a clearer and more accurate feedback sound when the push rod sleeve 5 rotates in one direction. This design improves the dosage control accuracy of the injection pen, allowing users to more accurately judge the injection dosage through audible feedback.

[0086] Please continue to refer to this. Figure 4 In some embodiments, the distal end of the push rod nut 3 is provided with an elastic cantilever 36 and a first clamping arm 32. Optionally, the elastic cantilever 36 and the first clamping arm 32 are a pair. The proximal end face of the push rod sleeve 5 abuts against the distal end face of the push rod nut 3. The proximal outer periphery of the push rod sleeve 5 is clamped by a pair of first clamping arms 32. The elastic cantilever 36 is located between the proximal end face of the push rod sleeve 5 and the first clamping arm 32.

[0087] In this embodiment, the distal end of the push rod nut 3 is designed with a pair of elastic cantilever arms 36 and a pair of first clamping arms 32. This structural design allows the push rod nut 3 to fit tightly with the push rod sleeve 5. The proximal end face of the push rod sleeve 5 abuts against the distal end face of the push rod nut 3, forming a stable contact surface. This direct contact helps to transmit force and maintain position when the push rod sleeve 5 rotates.

[0088] The proximal outer periphery of the push rod sleeve 5 is held by a pair of first clamping arms 32. This clamping action enhances the stability of the push rod sleeve 5 within the push rod nut 3 and limits the radial displacement of the push rod sleeve 5, thereby ensuring that it maintains the correct axial position during injection when the push rod sleeve 5 rotates. An elastic cantilever 36 is located between the proximal end face of the push rod sleeve 5 and the first clamping arms 32. This arrangement allows the elastic cantilever 36 to exert its elastic effect when the push rod sleeve 5 rotates, contacting the one-way gear disc 55 and limiting the reverse rotation of the push rod sleeve 5.

[0089] Through this structural design, the push rod nut 3 can not only stably position the push rod sleeve 5, but also ensure precise control of the push rod sleeve 5 during the injection process through the synergistic action of the elastic cantilever 36 and the first clamping arm 32. This precise control helps improve the accuracy of the injection dosage and reduces dosage errors caused by the reverse rotation of the push rod sleeve 5, thereby improving the overall performance and reliability of the injection pen.

[0090] Please continue to refer to this. Figure 4 In some embodiments, the near end of the push rod nut 3 is provided with a positioning spring 35, which is used to position the axial position of the cartridge bottle 1 and provide cushioning for the cartridge bottle 1.

[0091] In this embodiment, the positioning spring 35 is used to hold one end of the cartridge bottle 1 in the axial position, and the positioning spring 35 also serves to protect the cartridge bottle.

[0092] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the pen body, push rod nut, and pen refill holder provided in the embodiments of this application.

[0093] In some embodiments, the pen body 6 is provided with a first positioning hole 61; the distal end of the push rod nut 3 is provided with a first protrusion 31, which engages with the first positioning hole 61.

[0094] In this embodiment, the pen body 6 has a specific structural feature, namely a first positioning hole 61. The function of this positioning hole 61 is to provide a precise mating position for interacting with a specific component on the push rod nut 3. Specifically, the distal end of the push rod nut 3 is designed with a first protrusion 31, which mates with the first positioning hole 61 on the pen body 6.

[0095] The precise positioning of the push rod nut 3 relative to the pen body 6 is achieved through the engagement of the first protrusion 31 and the first positioning hole 61. This positioning mechanism ensures the positional stability of the push rod nut 3 within the pen body 6, thus providing a reliable structural foundation for the injection pen. This stability is crucial for ensuring the accuracy and repeatability of the injection dosage, as it helps maintain the correct alignment and movement of the push rod sleeve 5 and the push rod 4 during the injection process.

[0096] Furthermore, the engagement of the first protrusion 31 with the first positioning hole 61 helps ensure the correct installation orientation and position of the push rod nut 3 during assembly and disassembly of the injection pen. This design simplifies the assembly process of the injection pen and also makes maintenance and component replacement more convenient. Overall, this structural design improves the functionality and user experience of the injection pen.

[0097] Please refer to Figure 6 , Figure 6 This is a schematic diagram of a pen refill holder provided in an embodiment of this application.

[0098] In some embodiments, the feedback-optimized injection pen further includes:

[0099] A pen refill holder 8 is located on the pen body 6, and the interior of the pen refill holder 8 is used to install a cartridge bottle 1.

[0100] The pen body 6 has a second positioning hole 65 at its near end; the pen refill holder 8 has a second protrusion 81 at its far end, and the second protrusion 81 cooperates with the second positioning hole 65.

[0101] In this embodiment, the feedback-optimized injection pen design further includes a cartridge holder 8, which is installed inside the pen body 6. Its main function is to provide a stable mounting position for the cartridge 1. This design allows the cartridge 1 to be fixed inside the injection pen, ensuring stable delivery of the medication during injection.

[0102] To ensure stable positioning of the refill holder 8, a second positioning hole 65 is designed at the proximal end of the pen body 6. Correspondingly, a second protrusion 81 is provided at the distal end of the refill holder 8, which engages with the second positioning hole 65. Through this engagement, the refill holder 8 is precisely positioned within the pen body 6, ensuring the cartridge 1 remains fixed within the injection pen and preventing displacement during injection.

[0103] The engagement of the second protrusion 81 with the second positioning hole 65 not only provides a mechanical locking mechanism but also facilitates quick and accurate positioning of the pen cartridge 8 during assembly. This design simplifies the assembly process of the injection pen, improves production efficiency, and ensures the consistency and reliability of the final product.

[0104] like Figure 6 As shown, the pen refill holder 8 has a threaded interface 85 at its proximal end for mounting disposable needles. The pen refill holder 8 is hollow inside and open at its distal end for mounting cartridge bottles 1. The pen refill holder 8 has an axially extending second viewing window 84, which allows the operator to observe the usage of the cartridge bottle 1, such as the position of the rubber stopper 2 inside the cartridge bottle 1. The distal end of the pen refill holder 8 has a second protrusion 81, a positioning shoulder 82, and a clearance groove 83. The second protrusion 81 is connected to the pen body 6, the positioning shoulder 82 is axially positioned with the pen body 6, and the clearance groove 83 is located circumferentially between adjacent second protrusions 81.

[0105] Please refer to Figures 7 to 9 ,in, Figure 7 This is a schematic diagram of the push rod and push rod nut provided in an embodiment of this application. Figure 8 This is a schematic diagram of the push rod and push rod latch provided in an embodiment of this application. Figure 9 This is a schematic diagram of the push rod and push rod sleeve provided in an embodiment of this application.

[0106] like Figure 7 As shown, the outer side of the push rod 4 is provided with a push rod thread 41, which engages with the first internal thread 33 of the push rod nut 3 to enable the push rod 4 to move axially when it passes through and rotates relative to the push rod nut 3.

[0107] like Figure 8As shown, the proximal end of the push rod buckle 9 has a pushing surface 92, and the distal end of the push rod buckle 9 has a clamping plate 91. The clamping plate 91 engages with the connector 42 at the proximal end of the push rod 4 to fix the push rod buckle 9 in the axial position at the proximal end of the push rod 4. In use, as the push rod 4 moves axially, the pushing surface 92 at the proximal end of the push rod buckle 9 comes into contact with the rubber stopper 2 of the cartridge bottle 1, serving as the contact surface for the feedback-optimized injection pen to push the rubber stopper 2, thereby realizing the injection of the medicine.

[0108] like Figure 9 As shown, the push rod 4 passes through the inside of the push rod sleeve 5, and the push rod 4 is provided with a moving tangent 43 that cooperates with the limiting block 53 of the push rod sleeve 5 to realize the axial movement of the push rod 4 and the rotation of the push rod 4 under the drive of the push rod sleeve 5.

[0109] Specifically, the motion cut surface 43 is cut in a direction perpendicular to the axial direction and matches the radial shape of the limiting block 53 inside the push rod sleeve 5. This is used to control the push rod 4 to always rotate synchronously with the push rod sleeve 5 and to move freely axially within the push rod sleeve 5.

[0110] Please refer to Figures 10 to 15 ,in, Figure 10 This is a schematic diagram of the push rod sleeve provided in an embodiment of this application. Figure 11 This is a schematic diagram of the push rod sleeve and clutch provided in an embodiment of this application. Figure 12 This is a schematic diagram of the clutch and dosing drum provided in an embodiment of this application. Figure 13 This is another schematic diagram of the clutch and dosing drum provided in an embodiment of this application. Figure 14 This is a schematic diagram of the dosing drum provided in an embodiment of this application. Figure 15 This is a schematic diagram of the dosing drum and pen body provided in an embodiment of this application.

[0111] In some embodiments, the injection device further includes:

[0112] The clutch 11 is rotatably located inside the pen body 6. The clutch 11 is used to drive the push rod sleeve 5 to rotate and the clutch 11 can move axially.

[0113] The dosage drum 7 is threadedly connected to the pen body 6. The dosage drum 7 has a clutch 11 inside. The dosage drum 7 and the clutch 11 have two states: contact coupling and separation decoupling at different moving positions of the clutch 11.

[0114] The injection button 12 is rotatably mounted on the clutch 11, and the injection button 12 protrudes from the far end of the clutch 11.

[0115] In this embodiment, when the clutch 11 is decoupled from the dosage drum 7, the dosage drum 7 can rotate independently of the push rod sleeve 5. At this time, the operator can freely adjust the dosage, while the clutch 11 will not move, ensuring the independence and accuracy of dosage adjustment.

[0116] When the clutch 11 is coupled to the dosage drum 7, the rotation of the clutch 11 will be transmitted to the push rod sleeve 5, causing the push rod sleeve 5 and the dosage drum 7 to rotate synchronously. At this time, the one-way toothed disc 55 on the push rod sleeve 5 will contact the elastic cantilever 36, generating a feedback sound corresponding to the rotation angle, helping the operator to perceive the dosage through hearing.

[0117] like Figure 11 As shown, the distal end of the push rod sleeve 5 is provided with a notched flange 54, which is used for the linkage rib 114 inside the clutch 11 to be inserted, so as to realize the axial movement of the clutch 11 and the rotation of the push rod sleeve 5 under the drive of the clutch 11.

[0118] The number of linkage ribs 114 can be selected as four. The four linkage ribs 114 on the inner side of the clutch 11 are connected to the notch flange 54 at the far end of the push rod sleeve 5. The linkage ribs 114 are embedded in the notch on the notch flange 54 to restrict the push rod sleeve 5 from rotating synchronously with the clutch 11 and to make axial displacement within the clutch 11.

[0119] like Figure 10 As shown, a positioning step 52 is provided on the push rod sleeve 5. The positioning step 52 abuts against the first clamping arm 32 in the axial direction, further restricting the axial movement of the push rod sleeve 5 on the push rod nut 3.

[0120] In some embodiments, the inner wall of the pen body 6 is provided with a plurality of sound-emitting ribs 62, and the plurality of sound-emitting ribs 62 are distributed along the inner periphery of the pen body 6.

[0121] The proximal end of the dosing drum 7 is provided with a sound-emitting protrusion 79, which contacts the sound-emitting rib 62 and emits sound feedback when the dosing drum 7 rotates.

[0122] In this embodiment, a sound-emitting protrusion 79 is specially designed at the proximal end of the dosing drum 7. This sound-emitting protrusion 79 contacts the sound-emitting rib 62 on the inner wall of the pen body 6 when the dosing drum 7 rotates. Each contact produces a sound, and this sound feedback provides the user with an intuitive signal indicating that the dosing drum 7 is rotating, corresponding to the dosage adjustment process.

[0123] It should be noted that during the dosage adjustment process, the clutch 11 and the dosage drum 7 are in a decoupled state. Therefore, the dosage drum 7 can rotate independently of the push rod sleeve 5. In this state, the sound-emitting protrusion 79 on the dosage drum 7 can contact the sound-emitting rib 62 on the inner wall of the pen body 6, generating feedback sound corresponding to the rotation angle, helping the operator to perceive the dosage setting through hearing. At the same time, due to the decoupling of the clutch 11 and the dosage drum 7, there is no rotational motion transmission relationship between the push rod sleeve 5 and the dosage drum 7. The push rod sleeve 5 will not rotate and will not generate injection feedback sound to cause interference.

[0124] In some embodiments, the proximal end of the dosing drum 7 is provided with a limiting spring arm 72, and the distal end of the dosing drum 7 is provided with a limiting groove 75 and a linkage spline 74.

[0125] The clutch 11 has a linkage protrusion 112 at its distal end. The range of movement of the clutch 11 in the dosage drum 7 is limited by the limiting spring arm 72 and the limiting groove 75. When the clutch 11 moves toward the proximal end, the linkage spline 74 abuts against the linkage protrusion 112 to achieve coupling between the clutch 11 and the dosage drum 7.

[0126] In this embodiment, the clutch 11 is provided inside the dosage drum 7. The distal end of the clutch 11 is provided with a positioning flange 111. The positioning flange 111 abuts against the limiting groove 75 and the proximal end of the clutch 11 abuts against the limiting spring arm 72, so as to restrict the clutch 11 inside the dosage drum 7 and the clutch 11 is located in a position relatively biased to the distal end in the dosage drum 7.

[0127] In the setup for coupling and decoupling the dosage drum 7 and the clutch 11, the distal end of the clutch 11 is provided with a linkage protrusion 112, and the distal end of the dosage drum 7 is provided with a linkage spline 74. The linkage spline 74 is used to engage with the linkage protrusion 112 and achieve synchronous movement when the clutch 11 moves toward the proximal end.

[0128] In some embodiments, the sound-emitting protrusion 79 is provided on the outer side of the limiting spring arm 72;

[0129] The limiting spring arm 72 is elastic and can deform under the compression of the proximal end of the clutch 11;

[0130] Before the limiting spring arm 72 reaches the set deformation, the limiting spring arm 72 supports the clutch 11, so that the linkage protrusion 112 separates from the linkage spline 74, and the sound-emitting protrusion 79 remains in contact with the sound-emitting rib 62.

[0131] After the limiting spring arm 72 reaches the set deformation, the linkage protrusion 112 abuts against the linkage spline 74, and the sound-emitting protrusion 79 rises up and disengages from the sound-emitting rib 62.

[0132] In this embodiment, the limiting spring arm 72 is an elastic structure. The limiting spring arm 72 can be regarded as a seesaw. The part of the limiting spring arm 72 that abuts against the clutch 11 is located at one end of the seesaw, and the part of the limiting spring arm 72 that is connected to the sound-generating protrusion 79 is located at the other end of the seesaw.

[0133] During the dosage setting stage, the clutch 11 does not move towards the proximal end, and the clutch 11 is decoupled from the dosage drum 7. At this time, the limit spring arm 72 is not squeezed by the clutch 11, and the sound-emitting protrusion 79 always remains in contact with the sound-emitting rib 62. As the dosage drum 7 rotates during the dosage setting stage, the sound-emitting protrusion 79 and the sound-emitting rib 62 generate feedback.

[0134] During the injection phase, the clutch 11 moves towards the proximal end and couples with the dosage drum 7. At this time, the limiting spring arm 72 is squeezed by the clutch 11, and the limiting spring arm 72 tilts up and causes the sound-generating protrusion 79 to disengage from the sound-generating rib 62. Therefore, the sound-generating protrusion 79 does not generate feedback during the injection phase. The feedback during the injection phase only exists in the feedback sound generated by the one-way toothed disc 51 and the elastic cantilever 36 during injection.

[0135] Therefore, this scheme achieves feedback from different components at different stages. During the dosage setting stage, the feedback component is the dosage drum 7, while during the injection stage, the feedback component is the push rod sleeve 5. This avoids feedback interference from different components at different stages, making the feedback more accurate and effective.

[0136] Furthermore, due to the elastic effect of the limiting spring arm 72, before the limiting spring arm 72 undergoes sufficiently large deformation due to the movement of the clutch 11 toward the proximal end, there is a gap between the linkage spline 74 at the distal end of the dosage drum 7 and the linkage protrusion 112 at the distal end of the clutch 11. This is equivalent to the limiting spring arm 72 supporting the clutch 11, causing the linkage spline 74 to separate from the linkage protrusion 112. At this time, the dosage drum 7 and the clutch 11 move independently. When the limiting spring arm 72 undergoes sufficiently large deformation due to the movement of the clutch 11 toward the proximal end, the linkage spline 74 at the distal end of the dosage drum 7 engages with the linkage protrusion 112 at the distal end of the clutch 11. At this time, the dosage drum 7 and the clutch 11 move together.

[0137] Please refer to Figure 16 , Figure 16 A schematic diagram of the pen body provided in an embodiment of this application.

[0138] like Figure 16As shown, the pen body 6 has four symmetrical first positioning holes 61, which, in conjunction with four symmetrical first protrusions 31, fix the push rod nut 3 in the pen body 6. The pen body 6 also has four symmetrical second positioning holes 65, which, in conjunction with four symmetrical second protrusions 81, fix the pen refill holder 8 in the pen body 6. A sound-emitting rib 62 extends axially and is circumferentially distributed inside the pen body 6, making contact and emitting sound when the dosage drum 7 rotates. A threaded body 63 is provided inside the pen body 6, which, in conjunction with a first external thread 71, achieves a threaded connection of the dosage drum 7 within the pen body 6. The threaded body 63 can be configured as two segments, with the first external thread 71 engaging with the two segments of the threaded body 63 at the far end of the inner side of the pen body 6, ensuring that the dosage drum 7 can only move axially and rotate synchronously within the pen body 6 according to the thread pitch. A first viewing window 64 is provided at the far end of the pen body 6, which displays the dosage mark 77 on the dosage drum 7. As the dosage drum 7 rotates, the dosage mark 77 in the first viewing window 64 changes. The dosage indicator 77 can be multiple printed numbers, which are displayed through the first viewing window 64 at the remote end of the dosage drum 7, making it easy for the operator to identify the current usage status of the feedback-optimized injection pen.

[0139] Please refer to Figure 17 , Figure 17 This is a schematic diagram of the clutch and injection button provided in an embodiment of this application.

[0140] like Figure 17 As shown, the distal end of the clutch 11 is provided with a mounting hook 115. The mounting hook 115 is used to engage the mounting step 122 near the injection button 12 to fix the relative axial position of the injection button 12 and the clutch 11, and to allow the two parts to rotate.

[0141] A splined knob 76 is located at the distal end of the dosing drum 7, surrounding the proximal end of the injection button 12. The splined knob 76 can be a radial spline or a toothed shape, facilitating adjustment by the operator. The operator sets the desired dosage by rotating this knob-like part. The proximal part of the injection button 12 is partially obscured in the radial region by the internal space of the splined knob 76, enhancing the spatial cohesion and overall unity of the two.

[0142] like Figure 15 As shown, a stop block is provided at the proximal end of the dose drum 7. The stop block is used to abut against the threaded body 63 to limit the maximum axial movement distance generated by the rotation of the dose drum 7.

[0143] Optionally, a limiting window 78 is provided at the proximal end of the dose drum 7, which can serve as a stop block to achieve a rotational stop function. When the dose drum 7 rotates and moves relative to the pen body 6, one of the two threaded sections 63 at the distal end of the inner side of the pen body 6, at the proximal position, will abut against the limiting window 78 at the proximal end of the dose drum 7, thereby limiting the maximum axial displacement of the dose drum 7 within the pen body 6.

[0144] Please refer to Figure 18 and Figure 19 ,in, Figure 18 This is a structural diagram of the limiting nut and clutch provided in an embodiment of this application. Figure 19 This is a structural diagram of the limiting nut and the dosing drum provided in the embodiments of this application.

[0145] In some embodiments, the feedback-optimized injection pen further includes:

[0146] A limiting nut 10 is provided on the clutch 11. The limiting nut 10 is nested inside the dosing drum 7. The outer side of the limiting nut 10 is provided with a guide groove 101. The guide groove 101 is used for the guide rib 73 on the inner side of the dosing drum 7 to be inserted to realize the axial movement of the limiting nut 10. The inner side of the limiting nut 10 is provided with a second internal thread 102. The second internal thread 102 is used to connect with the second external thread 113 on the outer side of the clutch 11.

[0147] In this embodiment, the guide rib 73 extends axially inside the dosing drum 7. The symmetrical guide rib 73 engages with the symmetrical guide groove 101 on the outer side of the limiting nut 10, which restricts the limiting nut 10 to rotate synchronously with the dosing drum 7 and move axially along the guide rib 73. The second internal thread 102 on the inner side of the limiting nut 10 engages with the second external thread 113 of the clutch 11, which controls the limiting nut 10 to always perform specific axial displacement and rotation according to the second external thread 113 of the clutch 11.

[0148] In one specific embodiment, the feedback-optimized injection pen provided in this application is a pre-filled drug feedback-optimized injection pen with adjustable dosage and multiple uses, including a push rod nut 3, a push rod 4, a push rod sleeve 5, a pen body 6, a dosage drum 7, a pen core holder 8, a push rod buckle 9, a limit nut 10, a clutch 11, and an injection button 12. Injection can be performed by rotating the dosage drum 7 and pressing the injection button 12.

[0149] This application differs from similar products currently on the market in terms of component structure and parts assembly. Through the design of the pen body 6 and the dosage drum 7, the operator can make the touch and sound when adjusting the dosage more precise and easier to adjust, eliminating the need for other products to use multiple parts and springs to achieve the same effect.

[0150] During dosage setting and calibration, clutch 11 moves axially together with dosage drum 7, but clutch 11 does not rotate; simultaneously, push rod sleeve 5 has no rotational kinetic energy, so push rod 4 does not move axially or rotate. During injection, clutch 11 moves axially and rotates together with dosage drum 7, simultaneously driving push rod sleeve 5, which in turn drives push rod 4 to generate rotational kinetic energy, causing push rod 4 to move axially through push rod nut 3 to expel the medication.

[0151] The dosing drum 7 also includes multiple dosing indicators 77, corresponding to multiple dosing units visible in the window 64 on the pen body 6. The operator rotates the dosing drum 7 until the desired dose is visible in the window 64. Once the desired dose is set, the operator presses the injection button 12 until the set dose is fully injected. When the dosing indicator 77 on the dosing drum 7 displays 0 in the window 64 on the pen body 6, it serves as confirmation that the injection is complete.

[0152] When the operator rotates the dose drum 7 distally to adjust the maximum dose, the limiting window 78 at the proximal end of the dose drum 7 reaches the threaded body 63 at the distal end inside the pen body 6. The proximal side prevents the dose drum 7 from continuing to move distally, thereby limiting the operator from further increasing the dose.

[0153] When the operator rotates the dosage drum 7 to adjust the dosage (injection button 12 is not pressed proximally), the one-way toothed disc 51 at the proximal end of the push rod sleeve 5 abuts against the elastic cantilever 36 of the push rod nut 3, thereby limiting the rotation of the push rod sleeve 5; the distal notch flange 54 of the push rod sleeve 5 limits the synchronous rotation of the clutch 11 and the push rod sleeve 5. When the dosage drum 7 is rotated, the outer sound-emitting protrusion 79 of its proximal limiting spring arm 72 will make intermittent contact with the sound-emitting rib 62 inside the pen body 6, so as to produce the feel and sound when adjusting the dosage.

[0154] When the operator presses the injection button 12, the clutch 11 moves towards the proximal end of the relative axial position in the dosage drum 7. At this time, the linkage protrusion 112 at the distal end of the clutch 11 engages with the linkage spline 74 inside the distal end of the dosage drum 7, forcing the clutch 11 to rotate synchronously with the dosage drum 7. The limiting spring arm 72 on the inner side of the proximal end of the dosage drum 7 deforms inward, so that the rotation of the dosage drum 7 does not cooperate with the pen body 6 and produce a sound. As the clutch 11 rotates, it drives the push rod sleeve 5 to rotate synchronously. Therefore, the push rod 4 rotates with the push rod sleeve 5 and dispenses the required dose. The one-way toothed disc 51 at the proximal end of the push rod sleeve 5 cooperates with the elastic cantilever 361 of the push rod nut 3 to produce intermittent contact, so as to produce a feel and sound when injecting the dose.

[0155] When the clutch 11 does not rotate synchronously with the dosage drum 7 (dose adjustment), the limiting nut 10, which is threaded with the clutch 11, will move axially with the dosage drum 7, resulting in a corresponding axial displacement towards the distal or proximal end. The amount of displacement is determined by the pitch of the threads on the clutch 11. When the limiting nut 10 rotates to its farthest point, reaching the end of the threads on the clutch 11, it will restrict further rotation of the dosage drum 7, preventing the user from rotating it further to increase the dosage adjustment. During injection, because the clutch 11 rotates synchronously with the dosage drum 7, the limiting nut 10 will remain in the axial position on the clutch 11 before injection.

[0156] 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.

[0157] 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.

[0158] 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, include: Pen body; A push rod nut is provided on the pen body, and the push rod nut is provided with an elastic cantilever and a first clamping arm; Injection facilities, including: A push rod sleeve, when the push rod sleeve rotates relative to the pen body, the outer periphery of the proximal end of the push rod sleeve is held by the first clamping arm, and the axial position is positioned by the push rod nut. The proximal end of the push rod sleeve is provided with a one-way toothed disc, which contacts the elastic cantilever, restricting the one-way rotation of the push rod sleeve and generating sound feedback when rotating. A push rod is provided in the push rod sleeve, and the push rod is threadedly connected to the push rod nut. The push rod is driven to rotate by the push rod sleeve and moves under the action of the thread of the push rod nut to realize the dispensing of medicine liquid in the cartridge bottle; The proximal end face of the push rod sleeve abuts against the distal end face of the push rod nut, and the elastic cantilever is located between the proximal end face of the push rod sleeve and the first clamping arm.

2. The feedback-optimized injection pen according to claim 1, characterized in that, The number of elastic cantilever arms is multiple, and the multiple elastic cantilever arms are symmetrically arranged in the circumferential direction of the push rod nut.

3. The feedback-optimized injection pen according to claim 1, characterized in that, The first clamping arm is located at the far end of the push rod nut; a positioning step is provided at the near end of the push rod sleeve, and the positioning step abuts against the first clamping arm in the axial direction to restrict the axial movement of the push rod sleeve on the push rod nut.

4. The feedback-optimized injection pen according to claim 1, characterized in that, The near end of the push rod nut is provided with a positioning spring, which is used to position the axial position of the cartridge bottle and provide cushioning for the cartridge bottle; and / or, The pen body is provided with a first positioning hole; the distal end of the push rod nut is provided with a first protrusion, which cooperates with the first positioning hole.

5. The feedback-optimized injection pen according to claim 1, characterized in that, Also includes: A refill holder is provided on the pen body, and the interior of the refill holder is used to install a cartridge bottle; The pen body has a second positioning hole at its near end; the pen refill holder has a second protrusion at its far end, and the second protrusion engages with the second positioning hole.

6. The feedback-optimized injection pen according to any one of claims 1 to 5, characterized in that, The injection mechanism also includes: The clutch is rotatably disposed inside the pen body, and the clutch is used to drive the push rod sleeve to rotate and move axially; A dosing drum is threadedly connected to the pen body. The dosing drum has a clutch inside. The dosing drum and the clutch have two states: abutting coupling and disengagement decoupling, depending on the different moving positions of the clutch. An injection button is rotatably located on the clutch, and the injection button protrudes from the distal end.

7. The feedback-optimized injection pen according to claim 6, characterized in that, The inner wall of the pen body is provided with multiple sets of sound-emitting ribs, and the multiple sets of sound-emitting ribs are distributed along the inner circumference of the pen body; The proximal end of the dosage drum is provided with a sound-emitting protrusion, which contacts the sound-emitting rib and emits sound feedback when the dosage drum rotates.

8. The feedback-optimized injection pen according to claim 7, characterized in that, The proximal end of the dosage drum is provided with a limiting spring arm, and the distal end of the dosage drum is provided with a limiting groove and a linkage spline. The clutch has a linkage protrusion at its distal end. The range of movement of the clutch in the dosage drum is limited by the limiting spring arm and the limiting groove. When the clutch moves toward the proximal end, the linkage spline abuts against the linkage protrusion to achieve coupling between the clutch and the dosage drum.

9. The feedback-optimized injection pen according to claim 8, characterized in that, The sound-emitting protrusion is located on the outside of the limiting spring arm; The limiting spring arm is elastic and deforms under the compression of the proximal end of the clutch. Before the limiting spring arm reaches the set deformation, the limiting spring arm supports the clutch, causing the linkage protrusion to separate from the linkage spline, while the sound-generating protrusion remains in contact with the sound-generating rib. After the limiting spring arm reaches the set deformation, the linkage protrusion abuts against the linkage spline, and the sound-generating protrusion tilts up and disengages from the sound-generating rib.

10. The feedback-optimized injection pen according to claim 6, characterized in that, Also includes: A limiting nut is provided on the clutch and nested inside the dosing drum. The outer side of the limiting nut is provided with a guide groove for the guide rib on the inner side of the dosing drum to be inserted, so as to realize the axial movement of the limiting nut. The inner side of the limiting nut is provided with a second internal thread, which is used to connect with the second external thread on the outer side of the clutch.

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