Injection pen and clutch device thereof

Abstract

The utility model discloses an injection pen and a clutch device thereof, and relates to the technical field of medical instruments, the injection pen clutch device comprises a pen body, an injection mechanism, a dosage hub and a clutch, the injection mechanism is arranged on the pen body, and the injection mechanism is used for pushing injection of liquid medicine in a cartridge bottle; the dosage hub is arranged on the pen body, and the dosage hub can move in the axial direction of the pen body so as to adjust the injection amount; the clutch is used for driving the injection mechanism to achieve injection action, the clutch is arranged in the dosage hub, the clutch can move in the axial direction of the pen body, and on the moving path of the clutch, the clutch has the two states of abutting coupling with the dosage hub and separation decoupling with the dosage hub. According to the injection pen clutch device, by simplifying the structure of the injection pen clutch device, dependence on vulnerable parts such as a metal spring is reduced, so that the overall durability and reliability are improved, and the problems that in the prior art, a clutch mechanism is complex in structure, high in cost, difficult to maintain and poor in environmental adaptability are effectively solved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an injection pen and its clutch device. Background Technology

[0002] The clutch mechanism of an injection pen is an indispensable and crucial part of its mechanical system, responsible for the coupling and decoupling of the injection and adjustment mechanisms. During drug injection, the clutch mechanism ensures that the adjustment and injection mechanisms can flexibly separate and engage. When the user sets the desired drug dosage through the adjustment mechanism, the clutch mechanism keeps the adjustment and injection mechanisms decoupled, so that the adjustment action does not affect the injection mechanism, thereby preventing accidental drug injection during dosage setting.

[0003] Existing pen clutch mechanisms generally suffer from complex structures and high costs, primarily due to their reliance on multiple parts and metal springs to achieve precise control of dosage adjustment and injection. While these metal springs can provide the necessary elastic force in the short term, their durability and susceptibility to environmental influences limit the reliability of the clutch mechanism in the long run. The increased number of parts not only increases manufacturing costs but also makes maintenance more difficult; furthermore, mechanical wear and metal fatigue can lead to performance degradation over time. In addition, the complex structural design can increase the difficulty of user operation, affecting the accuracy and consistency of injection. Therefore, existing pen clutch mechanisms, due to their structural complexity, high cost, numerous parts, and reliance on metal springs, exhibit significant deficiencies in maintainability, durability, and environmental adaptability. Utility Model Content

[0004] The purpose of this application is to provide a clutch device for an injection pen. By simplifying the structure of the clutch device, the reliance on easily damaged parts such as metal springs is reduced, thereby improving the overall durability and reliability. This effectively solves the problems of complex structure, high cost, difficult maintenance, and poor environmental adaptability of existing clutch mechanisms. Another purpose of this application is to provide an injection pen.

[0005] To achieve the above objectives, this application provides an injection pen clutch device, comprising:

[0006] Pen body;

[0007] An injection mechanism is provided on the pen body, and the injection mechanism is used to push the liquid medicine in the cartridge bottle;

[0008] A dosage hub is provided on the pen body, and the dosage hub can move along the axial direction of the pen body to adjust the injection volume;

[0009] A clutch is arranged in the dose hub for driving the injection mechanism to perform a bolus action. The clutch is movable along an axial direction of the pen body. The clutch has two states of abutting coupling and decoupling with the dose hub along its moving path.

[0010] In some embodiments, the proximal end of the dose hub is provided with a limiting spring arm, and the distal end of the dose hub is provided with a limiting groove. The moving range of the clutch in the dose hub is limited by the limiting spring arm and the limiting groove.

[0011] In some embodiments, the distal end of the clutch is provided with a linkage protrusion, and the distal end of the dose hub is provided with a linkage spline. The linkage spline is used to abut the linkage protrusion to achieve the coupling of the clutch and the dose hub when the clutch moves towards the proximal end.

[0012] In some embodiments, the limiting spring arm has elasticity. The limiting spring arm can be deformed under the extrusion of the proximal end of the clutch. Before the limiting spring arm reaches a set deformation, the limiting spring arm supports the clutch and the linkage protrusion is separated from the linkage spline. After the limiting spring arm reaches the set deformation, the linkage protrusion abuts the linkage spline.

[0013] In some embodiments, the inner wall of the pen body is provided with a plurality of sound generating rib positions. The dose hub is provided with a sound generating protrusion, which is arranged outside the limiting spring arm.

[0014] When the clutch is in abutting coupling with the dose hub, the limiting spring arm is extruded by the proximal end of the clutch, and the sound generating protrusion is raised and out of contact with the sound generating rib position. When the clutch is decoupled from the dose hub, the sound generating protrusion always maintains contact with the sound generating rib position.

[0015] In some embodiments, the limiting spring arm and the sound generating protrusion are arranged as one or more pairs and symmetrically distributed in the circumferential direction of the dose hub.

[0016] In some embodiments, the injection mechanism comprises:

[0017] A push rod sleeve is arranged in the pen body. The push rod sleeve is used to rotate under the driving of the clutch. The push rod sleeve is provided with a sound generating tab.

[0018] The application also provides an injection pen comprising the above-mentioned injection pen clutch device. The injection mechanism comprises:

[0019] A push rod is arranged in the pen body. The push rod is used to perform a bolus action on the liquid medicine in the cartridge under the rotation of the push rod sleeve.

[0020] In some embodiments, the injection pen further comprises:

[0021] a cartridge holder fixedly arranged at the proximal end of the pen body, an inner portion of the cartridge holder being configured to receive a cartridge;

[0022] an injection button rotatably arranged at the clutch, the injection button being arranged at an outer portion of the distal end of the pen body.

[0023] In some embodiments, the injection pen further comprises:

[0024] a push rod nut fixedly arranged at the proximal end of the pen body, the push rod nut being configured to receive a push rod;

[0025] wherein a threaded body is arranged at an inner portion of the distal end of the pen body, the dose dial hub being threadedly coupled to the threaded body; and / or

[0026] a first window is arranged at the distal end of the pen body, the first window being configured to display a dose indicator at an outer portion of the dose dial hub.

[0027] With respect to the above background, the injection pen clutch device provided by the present application mainly comprises a pen body, an injection mechanism, a dose dial hub, and a clutch. The injection mechanism is arranged at the pen body and is configured to implement the injection of a liquid medicine in a cartridge. The dose dial hub is arranged at the pen body and is configured to move along an axial direction of the pen body to adjust the injection volume. The clutch is configured to drive the injection mechanism to implement the injection action. The clutch is arranged in the dose dial hub and is configured to move along the axial direction of the pen body. The clutch has two states, i.e., a coupled state and a decoupled state, in the moving path of the clutch.

[0028] In the prior art, the injection pen clutch device has obvious defects in terms of maintainability, durability, and environmental adaptability due to its complex structure, high cost, numerous parts, and dependence on a metal spring. To solve this technical problem, the injection pen clutch device provided by the present application has the innovative feature that the clutch is designed to move along the axial direction of the pen body and is integrated with the dose dial hub to form a compact and efficient structure. This design allows the clutch to be coupled to the dose dial hub to drive the injection mechanism to inject the liquid medicine when the clutch is in contact with the dose dial hub. When the clutch is decoupled from the dose dial hub, the adjustment mechanism can be operated independently of the injection mechanism, thereby avoiding accidental injection during the dose setting process.

[0029] By this design, the use of vulnerable components such as metal springs is avoided, as metal springs can fail due to fatigue or corrosion over time, affecting the reliability of the clutch mechanism. Therefore, by optimizing the interaction of the clutch and the dose hub, these vulnerable components are eliminated, thereby improving the overall durability of the clutch device. In addition, the simplified structure also reduces manufacturing and maintenance costs, as fewer components mean fewer assembly steps and lower failure rates.

[0030] At the same time, due to the simplification of the structure, the operation of the user when using the injection pen is more intuitive and simple, reducing errors caused by complex operations. This intuitiveness also helps to improve the accuracy and consistency of injection, ensuring accurate adjustment of the drug dose.

[0031] In combination with the above structure and process description, it can be seen that the injection pen clutch device has at least the following beneficial effects: the injection pen clutch device simplifies the structure of the injection pen clutch device, reduces the dependence on vulnerable components such as metal springs, thereby improving the overall durability and reliability, effectively solving the problems of complex clutch mechanism structure, high cost, difficult maintenance and poor environmental adaptability in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0033] Figure 1 A schematic diagram of the injection pen clutch device provided by the embodiments of the present application;

[0034] Figure 2 An assembly diagram of the injection pen provided by the embodiments of the present application;

[0035] Figure 3 A schematic diagram of the clutch and dose hub provided by the embodiments of the present application;

[0036] Figure 4 Another schematic diagram of the clutch and dose hub provided by the embodiments of the present application;

[0037] Figure 5 A schematic diagram of the pen body provided by the embodiments of the present application;

[0038] Figure 6 A schematic diagram of the pen body and sound projection provided by the embodiments of the present application;

[0039] Figure 7A schematic diagram of a pen body and a sound-making push piece according to an embodiment of the application;

[0040] Figure 8 A schematic diagram of a clutch and a push rod sleeve according to an embodiment of the application;

[0041] Figure 9 A schematic diagram of a clutch and an injection button according to an embodiment of the application;

[0042] Figure 10 An exploded view of an injection pen according to an embodiment of the application;

[0043] Figure 11 A sectional view of an injection pen according to an embodiment of the application;

[0044] Figure 12 A schematic diagram of a cartridge holder according to an embodiment of the application;

[0045] Figure 13 A schematic diagram of a push rod nut according to an embodiment of the application;

[0046] Figure 14 A schematic diagram of a push rod and a push rod nut according to an embodiment of the application;

[0047] Figure 15 A schematic diagram of a push rod and a push rod buckle according to an embodiment of the application;

[0048] Figure 16 A schematic diagram of a push rod sleeve and a push rod nut according to an embodiment of the application;

[0049] Figure 17 A schematic diagram of a push rod sleeve and a push rod according to an embodiment of the application;

[0050] Figure 18 A schematic diagram of a dose hub according to an embodiment of the application;

[0051] Figure 19 A structural diagram of a limiting nut and a clutch according to an embodiment of the application;

[0052] Figure 20 A structural diagram of a limiting nut and a dose hub according to an embodiment of the application.

[0053] Wherein:

[0054] an injection mechanism 100,

[0055] a cassette bottle 1,

[0056] a rubber plug 2,

[0057] a push rod nut 3, a first protrusion 31, a first clamping arm 32, a first internal thread 33, a second protrusion 34, a positioning spring piece 35, a conical surface cavity 36,

[0058] push rod 4, push rod thread 41, connecting head 42, motion section 43,

[0059] push rod sleeve 5, sound-making tab 51, conical flange 52, limiting block 53, notch flange 54,

[0060] pen body 6, first positioning hole 61, sound-making rib 62, threaded body 63, first window 64,

[0061] dose hub 7, first external thread 71, limiting spring arm 72, guide rib 73, linkage spline 74, limiting groove 75, spline knob 76, dose identifier 77, limiting window 78, sound-making protrusion 79,

[0062] pen cartridge holder 8, second positioning hole 81, positioning shoulder 82, avoidance slot 83, second window 84, threaded interface 85,

[0063] push rod buckle 9, caliper plate 91, push face 92,

[0064] limiting nut 10, guide groove 101, second internal thread 102,

[0065] clutch 11, positioning flange 111, linkage protrusion 112, second external thread 113, linkage rib 114, mounting barb 115,

[0066] injection button 12, button surface 121, mounting step 122. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0068] In order 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 drawings and specific embodiments.

[0069] It should be noted that the proximal end herein refers to the side close to the needle and the injection site, i.e., the leading end of the injection pen, and the distal end refers to the side opposite to the proximal end, i.e., the trailing end of the injection pen. Based on this, each component has its proximal end and distal end, and the proximal end and distal end of different components comply with the same definition rules.

[0070] Please refer to Figure 1 , Figure 1 The schematic diagram of the injection pen clutch device provided in the embodiments of the present application is shown in FIG. 1.

[0071] As Figure 1 shown in the first embodiment, the injection pen clutch device provided by the embodiment of the application mainly comprises a pen body 6, an injection mechanism 100, a dose hub 7 and a clutch 11.

[0072] Please refer to Figure 2 , Figure 2 the assembly view of the injection pen provided by the embodiment of the application.

[0073] The application also provides an injection pen comprising the injection pen clutch device, such as the pen body 6, the injection mechanism 100, the dose hub 7 and the clutch 11. The injection mechanism 100 is used to implement injection, and the dose hub 7 is used to adjust the dose before injection. The injection mechanism 100 at least comprises a push rod sleeve 5.

[0074] It should be noted that the improvement of the embodiment is in the injection pen clutch device, and the contents other than the injection pen clutch device do not belong to the improvement of the embodiment; for example, the other components of the injection mechanism 100, the working principle of the injection mechanism 100 and the dose hub 7 do not belong to the scope of the description of the embodiment.

[0075] The improvement of the embodiment will be described below.

[0076] Please continue to refer to Figure 1 and Figure 2 and refer to Figure 3 and Figure 4 , Figure 3 the schematic view of the clutch and the dose hub provided by the embodiment of the application, Figure 4 another schematic view of the clutch and the dose hub provided by the embodiment of the application.

[0077] The injection mechanism 100 is arranged in the pen body 6, and the injection mechanism 100 is used to implement the injection of the liquid medicine in the cartridge 1.

[0078] The dose hub 7 is arranged in the pen body 6, and the dose hub 7 can move along the axial direction of the pen body 6 to adjust the injection amount.

[0079] The clutch 11 is used to drive the injection mechanism 100 to implement the injection action. The clutch 11 is arranged in the dose hub 7, and the clutch 11 can move along the axial direction of the pen body 6. On the moving path of the clutch 11, the clutch 11 has two states of abutting coupling and separation decoupling with the dose hub 7.

[0080] In the prior art, the injection pen clutch device has obvious defects in maintainability, durability and environmental adaptability due to its structural complexity, high cost, numerous parts and reliance on metal springs. To solve this technical problem, the technical solution proposes an injection pen clutch device, which is innovative in that the clutch 11 is designed to be axially movable along the pen body 6 and integrated with the dose hub 7, forming a compact and efficient structure. This design allows the clutch 11 to be coupled when it is in contact with the dose hub 7, driving the injection mechanism 100 to inject the liquid medicine; when the clutch 11 is separated from the dose hub 7, it is decoupled, allowing the adjustment mechanism to operate independently of the injection mechanism 100, avoiding accidental injection during dose setting.

[0081] With this design, the use of easily damaged parts such as metal springs is avoided, as metal springs can fail due to fatigue or corrosion over time, affecting the reliability of the clutch mechanism. Therefore, by optimizing the interaction between the clutch 11 and the dose hub 7, these easily damaged parts are eliminated, thereby improving the durability of the entire clutch device. In addition, the simplified structure also reduces manufacturing and maintenance costs, as fewer parts mean fewer assembly steps and lower failure rates.

[0082] At the same time, due to the simplification of the structure, the user's operation when using the injection pen is more intuitive and simple, reducing errors caused by complex operations. This intuitiveness also helps to improve the accuracy and consistency of injection, ensuring accurate adjustment of the drug dose.

[0083] In combination with the above structure and process description, it can be seen that the injection pen clutch device has at least the following beneficial effects: by simplifying the structure of the injection pen clutch device, the reliance on easily damaged parts such as metal springs is reduced, thereby improving the overall durability and reliability, effectively solving the problems of complex clutch mechanism structure, high cost, difficult maintenance and poor environmental adaptability in the prior art.

[0084] Please continue to refer to Figure 3 In some embodiments, the proximal end of the dose hub 7 is provided with a limiting spring arm 72, and the distal end of the dose hub 7 is provided with a limiting groove 75; the movement range of the clutch 11 in the dose hub 7 is limited by the limiting spring arm 72 and the limiting groove 75.

[0085] In the design of the clutch 11 inside the dose hub 7, the distal end of the clutch 11 is provided with a positioning flange 111, the proximal end of the dose hub 7 is provided with a limiting spring arm 72, and the distal end of the dose hub 7 is provided with a limiting groove 75, the positioning flange 111 is in contact with the limiting groove 75, and the proximal end of the clutch 11 is in contact with the limiting spring arm 72, to limit the clutch 11 inside the dose hub 7, and the clutch 11 is located at a relatively distally biased position in the dose hub 7.

[0086] Please continue to refer to Figure 4 In some embodiments, the distal end of the clutch 11 is provided with a linkage protrusion 112, and the distal end of the dose drum hub 7 is provided with a linkage spline 74, which is used to abut the linkage protrusion 112 when the clutch 11 moves towards the proximal end to achieve coupling of the clutch 11 and the dose drum hub 7.

[0087] In the arrangement of coupling and decoupling of the dose drum hub 7 and the clutch 11, the distal end of the clutch 11 is also provided with a linkage protrusion 112, and the distal end of the dose drum hub 7 is provided with a linkage spline 74, which is used to abut the linkage protrusion 112 when the clutch 11 moves towards the proximal end to achieve synchronous movement.

[0088] In some embodiments, the limiting elastic arm 72 has elasticity, and the limiting elastic arm 72 can be deformed under the extrusion of the clutch 11 towards the proximal end. Before the limiting elastic arm 72 reaches a set deformation, the limiting elastic arm 72 props up the clutch 11 and the linkage protrusion 112 and the linkage spline 74 are separated, and after the limiting elastic arm 72 reaches the set deformation, the linkage protrusion 112 and the linkage spline 74 abut.

[0089] In this embodiment, due to the elastic effect of the limiting elastic arm 72, when the limiting elastic arm 72 has not deformed enough due to the movement of the clutch 11 towards the proximal end, the linkage spline 74 at the distal end of the dose drum 7 and the linkage protrusion 112 at the distal end of the clutch 11 are spaced apart, which means that the limiting elastic arm 72 supports the clutch 11, so that the linkage spline 74 and the linkage protrusion 112 are separated, and at this time the dose drum 7 and the clutch 11 move independently; when the limiting elastic arm 72 deforms enough due to the movement of the clutch 11 towards the proximal end, the linkage spline 74 at the distal end of the dose drum 7 and the linkage protrusion 112 at the distal end of the clutch 11 are combined, and at this time the dose drum 7 and the clutch 11 move together.

[0090] Please refer to Figure 5 , Figure 5 The schematic diagram of the pen body provided by the embodiment of the present application is shown.

[0091] As Figure 5 shown, the inner wall of the pen body 6 is provided with a plurality of sound generating rib positions 62, which are distributed along the inner periphery of the pen body 6 to form a sound generating area on the inner wall of the pen body 6.

[0092] Please refer to Figure 6 , Figure 6 The schematic diagram of the pen body and the sound generating protrusion provided by the embodiment of the present application is shown.

[0093] As Figure 6As shown, the dose hub 7 is provided with a sound-producing protrusion 79, which is arranged towards the sound-producing area and is used to produce a first kind of feedback corresponding to the rotation angle when the dose hub 7 rotates relative to the pen body 6. Optionally, the sound-producing protrusion 79 contacts the sound-producing ridge 62 one by one, and the feedback sound has a clear paragraph feeling.

[0094] Please continue to refer to Figure 6 In some embodiments, the sound-producing protrusion 79 is arranged outside the limiting elastic arm 72.

[0095] When the clutch 11 is in abutting coupling with the dose hub 7, the limiting elastic arm 72 is pressed by the proximal end of the clutch 11, the sound-producing protrusion 79 is raised and out of contact with the sound-producing ridge 62; when the clutch 11 is decoupled from the dose hub 7, the sound-producing protrusion 79 always maintains contact with the sound-producing ridge 62.

[0096] In the present embodiment, the limiting elastic arm 72 is a structure with elasticity, and the limiting elastic arm 72 can be regarded as a seesaw, the part of the limiting elastic arm 72 abutting against the clutch 11 is located at one end of the seesaw, and the part of the limiting elastic arm 72 connected with the sound-producing protrusion 79 is located at the other end of the seesaw.

[0097] In the dose setting stage, the clutch 11 does not move towards the proximal end, the clutch 11 is decoupled from the dose hub 7, at this time the limiting elastic arm 72 is not pressed by the clutch 11, the sound-producing protrusion 79 always maintains contact with the sound-producing ridge 62, and the sound-producing protrusion 79 produces feedback with the sound-producing ridge 62 along with the rotation of the dose hub 7 in the dose setting stage.

[0098] In the injection stage, the clutch 11 moves towards the proximal end, the clutch 11 is coupled with the dose hub 7, at this time the limiting elastic arm 72 is pressed by the clutch 11, the limiting elastic arm 72 is raised and drives the sound-producing protrusion 79 out of contact with the sound-producing ridge 62, so the sound-producing protrusion 79 does not produce feedback in the injection stage.

[0099] In some embodiments, the limiting elastic arm 72 and the sound-producing protrusion 79 are arranged as one or more pairs and symmetrically distributed in the circumferential direction of the dose hub 7.

[0100] In the present embodiment, the sound-producing protrusion 79 can be arranged as one or more pairs and symmetrically distributed, and abuts against the sound-producing ridge 62 extending axially and circumferentially arranged inside the pen body 6, so as to indirectly contact the pen body 6 and emit sound when the dose hub 7 rotates.

[0101] Please refer to Figure 7 , Figure 7 The schematic diagram of the pen body and the sound-producing dial piece provided in the embodiments of the present application.

[0102] In some embodiments, the injection mechanism 100 comprises:

[0103] A push rod sleeve 5 is arranged in the pen body 6, and the push rod sleeve 5 is arranged to rotate under the drive of the clutch 11. The push rod sleeve 5 is provided with sound generating tabs 51.

[0104] In the embodiment, the sound generating tabs 51 are arranged towards the sound generating area, and the sound generating tabs 51 are arranged to contact the sound generating ribs 62 when the push rod sleeve 5 rotates relative to the pen body 6, thereby generating a second feedback sound corresponding to the rotation angle. Alternatively, the sound generating tabs 51 are arranged to contact the sound generating ribs 62 one by one, and the feedback sound has a clear paragraph feeling.

[0105] Specifically, the push rod sleeve 5 in the injection mechanism 100 is provided with sound generating tabs 51, and the tabs 51 contact the sound generating ribs 62 when the push rod sleeve 5 rotates, thereby generating a first feedback sound corresponding to the rotation angle. The sound feedback is not only clear, but also more direct and loud because the sound generating area is located on the wall of the pen body 6, thereby improving the recognizability of the sound. Meanwhile, the dose hub 7 in the adjustment mechanism 200 is provided with sound generating protrusions 79, and the protrusions 79 contact the sound generating ribs 62 when the dose hub 7 rotates, thereby generating a second feedback sound. Because the sound generating protrusions 79 and the sound generating tabs 51 are designed differently, the sounds generated when they contact the sound generating ribs 62 are also different, which provides an easy-to-distinguish sound prompt for the operator, and makes the sound signals of the dose adjustment and the injection process have a clear distinction.

[0106] Alternatively, the sound generating tabs 51 can be arranged in a pair and symmetrically distributed, and the proximal sound generating tabs 51 abut the sound generating ribs 62 extending axially and circumferentially inside the pen body 6, thereby achieving the indirect contact between the push rod sleeve 5 and the pen body 6 when the push rod sleeve 5 rotates, and generating a sound. In addition, the contact relationship between the proximal sound generating tabs 51 and the sound generating ribs 62 can also provide a basic resistance, thereby avoiding the rotation of the push rod sleeve 5 when it does not receive a rotating force, and improving the accuracy of the start of the push rod sleeve 5.

[0107] It should be noted that, in the dose setting stage, the clutch 11 is decoupled from the dose hub 7, and the push rod sleeve 5 does not act, and therefore the sound generating is the sound generating protrusions 79; in the injection stage, the clutch 11 is coupled with the dose hub 7, the limiting elastic arm 72 is raised, the sound generating protrusions 79 are disengaged from the sound generating ribs 62, and the push rod sleeve 5 acts, and therefore the sound generating is the sound generating tabs 51.

[0108] Therefore, the scheme realizes that the components for generating feedback are different in different stages. In the dose setting stage, the component for generating feedback is the dose hub 7, and in the injection stage, the component for generating feedback is the push rod sleeve 5. The feedback interference of different components in different stages is avoided, and the feedback is more accurate and effective.

[0109] Please refer to Figure 8 and Figure 9 ,Figure 8 A schematic diagram of a clutch and a push rod sleeve provided by an embodiment of the present application, Figure 9 A schematic diagram of a clutch and an injection button provided by an embodiment of the present application.

[0110] In some cases, the clutch 11 is rotatably arranged inside the pen body 6, and is used to drive the rotation of the push rod sleeve 5. The clutch 11 is axially movable, and has two states of abutting coupling and decoupling with the dose hub 7 on the moving path of the clutch 11.

[0111] When the clutch 11 is in the decoupling state with the dose hub 7, the dose hub 7 can rotate independently of the push rod sleeve 5, and at this time the operator can freely adjust the dose, and the clutch 11 does not act, ensuring the independence and accuracy of the dose adjustment. In this state, the sound-producing protrusion 79 on the dose hub 7 can be in contact with the sound-producing rib position 62 on the inner wall of the pen body 6, producing a feedback sound corresponding to the rotation angle, helping the operator to perceive the setting of the dose through the sense of hearing.

[0112] When the clutch 11 is in the coupling state with the dose hub 7, the rotation of the clutch 11 will be transmitted to the push rod sleeve 5, so that the push rod sleeve 5 and the dose hub 7 rotate synchronously. At this time, the sound-producing tab 51 on the push rod sleeve 5 will be in contact with the sound-producing rib position 62, producing a feedback sound corresponding to the rotation angle, helping the operator to perceive the injection of the dose through the sense of hearing.

[0113] Optionally, the distal end of the push rod sleeve 5 is provided with a notched flange 54, which is used for the linkage rib position 114 inside the clutch 11 to be embedded, so as to realize the axial movement of the clutch 11 and the rotation of the push rod sleeve 5 driven by the clutch 11.

[0114] The number of linkage rib positions 114 can be four, and the four linkage rib positions 114 inside the clutch 11 are connected with the notched flange 54 at the distal end of the push rod sleeve 5, and the linkage rib position 114 is embedded in the notch on the notched flange 54, so as to limit the synchronous rotation of the push rod sleeve 5 with the clutch 11 and the axial displacement of the push rod sleeve 5 in the clutch 11.

[0115] Please continue to refer to Figure 2 and refer to Figure 10 and Figure 11 , Figure 10 An exploded view of the injection pen provided by an embodiment of the present application, Figure 11 A cross-sectional view of the injection pen provided by an embodiment of the present application.

[0116] The present application also provides an injection pen comprising the above-mentioned injection pen clutch device, and the injection mechanism 100 comprises:

[0117] A push rod 4 is arranged in the pen body 6, and the push rod 4 is used to realize the injection of the liquid medicine in the cartridge 1 under the rotation of the push rod sleeve 5.

[0118] The injection pen should have all the beneficial effects of the injection pen clutch device described above; in short, the injection pen is simplified in structure, the complexity and maintenance cost are reduced, the durability is significantly improved, and long-term stable use is ensured.

[0119] As an option, the sound generating rib position 62 can adopt a diamond-shaped rib position structure.

[0120] Please refer to Figure 12 , Figure 12 The schematic diagram of the refill holder provided in the embodiment of the application.

[0121] In some embodiments, the injection pen further comprises:

[0122] A refill holder 8 is fixedly arranged at the proximal end of the pen body 6, and the interior of the refill holder 8 is used to mount the cartridge 1.

[0123] In the embodiment, the refill holder 8 is designed with a space for mounting the cartridge 1 inside, which ensures that the cartridge 1 can be stably mounted in the injection pen, and the liquid medicine can be smoothly pushed out of the cartridge 1.

[0124] As an option, the proximal end of the refill holder 8 is provided with a threaded interface 85 for mounting a disposable needle. The interior of the refill holder 8 is hollow and the distal end is open for mounting the cartridge 1. The refill holder 8 is provided with a second window 84 extending in the axial direction, which facilitates the operator to observe the use of the cartridge 1, such as the position of the rubber plug 2 inside the cartridge 1. The distal end of the refill holder 8 is provided with a second positioning hole 81, a positioning shoulder 82 and an avoidance groove 83, the second positioning hole 81 is connected with the refill holder 8, the positioning shoulder 82 is axially positioned with the pen body 6, and the avoidance groove 83 is located between adjacent second positioning holes 81 in the circumferential direction.

[0125] In some embodiments, the injection pen further comprises:

[0126] An injection button 12 is rotatably arranged in the clutch 11, and the injection button 12 is located outside the distal end of the pen body 6.

[0127] As an option, the proximal end of the injection button 12 is provided with a mounting step 122, and the distal end of the injection button 12 is provided with a button surface 121 for providing a better touch feeling when the operator presses. The distal end of the clutch 11 is provided with a mounting barb 115, which is used for the mounting step 122 at the proximal end of the injection button 12 to be clamped into, so as to combine and fix the relative axial position of the injection button 12 and the clutch 11, and allow the two parts to rotate.

[0128] The injection pen is described below in combination with the injection button 12.

[0129] When the operator rotates the dose hub 7 to adjust the dose (the injection button 12 is not pressed proximally), the sound generating tab 51 at the proximal end of the push rod sleeve 5 abuts the sound generating ribs 62 distributed circumferentially and extending axially inside the pen body 6, thereby limiting the rotation of the push rod sleeve 5; the clutch 11 is in the decoupled state with the dose hub 7, and the push rod sleeve 5 will not move due to the movement of the dose hub 7. When the dose hub 7 is rotated, the sound generating protrusions 79 on the outer side of the proximal end of the limiting spring arm 72 will intermittently contact the sound generating ribs 62 inside the pen body 6, so as to generate the tactile and sound feedback during dose adjustment.

[0130] When the operator presses the injection button 12, the relative axial position of the clutch 11 in the dose hub 7 moves proximally, and the limiting spring arm 72 is deformed under the extrusion of the proximal end of the clutch 11. When the limiting spring arm 72 is deformed enough, the linkage protrusion 112 at the distal end of the clutch 11 engages with the linkage spline 74 inside the distal end of the dose hub 7, and the clutch 11 is in the coupled state with the dose hub 7, forcing the clutch 11 to rotate synchronously with the dose hub 7; due to the inward deformation of the limiting spring arm 72, the sound generating protrusions 79 on the outer side of the limiting spring arm 72 will be separated from the sound generating ribs 62 inside the pen body 6; due to the rotation of the clutch 11, the push rod sleeve 5 rotates synchronously, so the push rod 4 rotates with the push rod sleeve 5 and discharges the required dose; the sound generating tab 51 at the proximal end of the push rod sleeve 5 cooperates with the sound generating ribs 62 distributed circumferentially and extending axially inside the pen body 6 to generate intermittent contact, so as to generate tactile and sound feedback during injection of the dose.

[0131] Please refer to Figure 13 , Figure 13 The schematic diagram of the push rod nut provided in the embodiments of the present application.

[0132] In some embodiments, the injection pen further comprises:

[0133] The push rod nut 3 is fixedly arranged at the proximal end of the pen body 6, and the push rod nut 3 is used for the push rod 4 to pass through.

[0134] In the embodiments, the presence of the push rod nut 3 ensures the stable positioning and smooth movement of the push rod 4. In some cases, the push rod nut 3 and the push rod 4 also have a cooperation relationship, and with the rotating action of the push rod 4, the push rod nut 3 can convert the rotation of the push rod 4 into displacement, and then realize the injection of the drug under the movement of the push rod 4. In use, the push rod 4 pushes the rubber plug 2 at the distal end of the cartridge 1 after passing through the push rod nut 3 to discharge the drug.

[0135] In some cases, the distal end of the push rod nut 3 is provided with a first protrusion 31, and the first protrusion 31 is used for clamping into the first positioning hole 61 at the proximal end of the pen body 6.

[0136] Optionally, the distal end of the push rod nut 3 is provided with four first protrusions 31 symmetrically distributed in the circumferential direction, which are engaged with four first positioning holes 61 at the proximal end of the pen body 6 to fix the axial and radial positions of the push rod nut 3 in the pen body 6.

[0137] Please refer to Figure 14 , Figure 14 The schematic diagram of the push rod and the push rod nut provided in the embodiment of the present application.

[0138] In some cases, the push rod nut 3 is provided with a first internal thread 33, and the outer side of the push rod 4 is provided with a push rod thread 41, which is engaged with the first internal thread 33 to realize the axial displacement of the push rod 4 when it penetrates and rotates relative to the push rod nut 3.

[0139] In some cases, the proximal end of the push rod nut 3 is provided with a second protrusion 34, which is used to be clamped into the second positioning hole 81 at the distal end of the cartridge holder 8.

[0140] Optionally, the proximal end of the push rod nut 3 is provided with two second protrusions 34 symmetrically distributed in the circumferential direction, which are engaged with the second positioning hole 81 at the distal end of the cartridge holder 8 to realize the axial and radial fixation of the push rod nut 3 and the cartridge holder 8.

[0141] In some cases, the proximal 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. The positioning spring 35 is used to abut against the axial position of one end of the cartridge bottle 1, and simultaneously plays a role in protecting the cartridge bottle.

[0142] Please refer to Figure 15 , Figure 15 The schematic diagram of the push rod and the push rod nut provided in the embodiment of the present application.

[0143] In some cases, the proximal end of the push rod nut 3 is provided with a second protrusion 34, which is used to be clamped into the second positioning hole 81 at the distal end of the cartridge holder 8.

[0144] Please refer to Figure 16 , Figure 16 The schematic diagram of the push rod and the push rod nut provided in the embodiment of the present application.

[0145] Further, in the rotatable arrangement of the push rod sleeve 5 relative to the pen body 6, the proximal end of the push rod sleeve 5 is provided with a tapered flange 52, the distal end of the push rod nut 3 is provided with a tapered cavity 36 and a pair of first clamping arms 32, the tapered surface of the proximal end of the tapered flange 52 is embedded in the tapered cavity 36, and the main body of the distal end of the tapered flange 52 is clamped by the pair of first clamping arms 32.

[0146] The cross section of the tapered cavity 36 is a slope, the tapered cavity 36 accommodates the outer shape of the proximal end of the tapered flange 52, and the pair of first clamping arms 32 clamps the distal end main body of the tapered flange 52, realizing the axial position of the fixed push rod sleeve 5 in the push rod nut 3, and the push rod sleeve 5 is rotatable.

[0147] Please refer to Figure 17 , Figure 17 The schematic diagram of the push rod sleeve and the push rod provided in the embodiments of the present application.

[0148] Further, in the arrangement that the push rod sleeve 5 is provided for the push rod 4 to pass through and can drive the push rod 4 to rotate, the inside of the push rod sleeve 5 is provided with a limiting block 53, the push rod 4 includes a push rod 4 provided with a movement section 43, the push rod 4 passes through the inside of the push rod sleeve 5, and the movement section 43 cooperates with the limiting block 53 inside the push rod sleeve 5 to realize the axial movement of the push rod 4 and the rotation of the push rod 4 driven by the push rod sleeve 5.

[0149] The movement section 43 is cut in the direction perpendicular to the axial direction, and the shape of the movement section 43 is consistent with the shape of the limiting block 53 inside the push rod sleeve 5 in the radial direction, so as to control the push rod 4 to always rotate synchronously with the push rod sleeve 5 and freely move axially in the push rod sleeve 5.

[0150] Please refer to Figure 18 , Figure 18 The schematic diagram of the dose hub provided in the embodiments of the present application.

[0151] In some embodiments, the push rod nut 3 is fixedly arranged at the proximal end of the pen body 6, and the inside of the distal end of the pen body 6 is provided with a threaded body 63; the dose hub 7 is threadedly matched with the threaded body 63.

[0152] In the embodiments, the push rod nut 3 is fixed at the proximal end of the pen body 6, and such arrangement provides stable support for the internal components at the proximal end. Meanwhile, the threaded body 63 of the pen body 6 provides stable support for the internal components at the distal end. The combination of the proximal end and the distal end design makes the structure of the entire injection pen more balanced, the operation more accurate, and helps to improve the functionality and user experience of the injection pen.

[0153] As an option, the threaded body 63 can be provided in two sections, the outer side of the dose hub 7 is provided with a first outer thread 71 for connecting with the threaded body 63 on the inner side of the pen body 6, the first outer thread 71 is connected with the two-section threaded body 63 on the distal end of the inner side of the pen body 6, ensuring that the dose hub 7 can only move a certain axial distance and rotate synchronously with the threaded pitch in the pen body 6.

[0154] In some cases, the distal end of the dose hub 7 is provided with a spline knob 76, which surrounds the proximal end of the injection button 12. The spline knob 76 can be a radial spline or a tooth shape, which facilitates the operator to adjust by turning the knob-shaped part to set the desired dose. The part of the proximal end of the injection button 12 is shielded by the internal space of the spline knob 76 in the radial area, so that the combination of space and integrity is stronger.

[0155] The outer side of the dose hub 7 is provided with a dose indicator 77, and the distal end of the pen body 6 is provided with a first window 64 for displaying the dose indicator 77. The dose indicator 77 can be a plurality of printed numbers, and the dose indicator 77 of the dose hub 7 is displayed through the distal first window 64, which is convenient for the operator to identify the current use state of the injection pen.

[0156] In some cases, the proximal end of the dose hub 7 is provided with a stop block for abutting with the threaded body 63 to limit the maximum axial movement distance generated by the rotation of the dose hub 7.

[0157] As an option, the proximal end of the dose hub 7 is provided with a limiting window 78, which can realize the rotation stop function as a stop block. When the dose hub 7 rotates and moves relative to the pen body 6, one of the two-section threaded body 63 on the distal end of the inner side of the pen body 6 will abut with the limiting window 78 on the proximal end of the dose hub 7, which is used to limit the maximum axial displacement of the dose hub 7 in the pen body 6.

[0158] Please refer to Figure 19 and Figure 20 , Figure 19 the structure diagram of the limiting nut and the clutch provided in the embodiments of the present application, Figure 20 the structure diagram of the limiting nut and the dose hub provided in the embodiments of the present application.

[0159] In some cases, the injection pen further comprises a limiting nut 10, which is sleeved on the clutch 11, and the limiting nut 10 is nested in the interior of the dose hub 7.

[0160] Specifically, the outer side of the limiting screw cap 10 is provided with a guide groove 101, which is used for embedding the guide rib 73 on the inner side of the dose hub 7 to realize the axial movement of the limiting screw cap 10. The inner side of the limiting screw cap 10 is provided with a second internal thread 102, which is used for connecting with the second external thread 113 on the outer side of the clutch 11.

[0161] As an option, the guide rib 73 extends axially on the inner side of the dose hub 7. The symmetrical guide rib 73 is connected with the symmetrical guide groove 101 on the outer side of the limiting screw cap 10, which is used for limiting the limiting screw cap 10 to only rotate synchronously with the dose hub 7 and move axially along the guide rib 73. The second internal thread 102 on the inner side of the limiting screw cap 10 is connected with the second external thread 113 of the clutch 11, so as to control the limiting screw cap 10 to always perform specific axial displacement and rotation according to the second external thread 113 of the clutch 11.

[0162] In a specific embodiment, the injection pen provided by the present application is a pen-type injector. The proximal end is the injection end connected with the medicine cartridge such as the cassette bottle 1. The distal end is the adjustment end for adjusting the dose of injection. The first window 64 has a dose mark 77. The distal end is further provided with a spline knob 76. When the spline knob 76 is rotated, the dose hub 7 can be rotated and axially displaced. The distal end is further provided with an injection button 12. When the injection button 12 is pressed, the dose hub 7 can be pushed to move towards the injection end.

[0163] The cassette bottle 1 used in the present application is basically consistent with the common specifications of cassette bottles. The parts used in the injection pen can be made of various plastics (ABS, POM, nylon, etc.), and can have different specifications and structures. In use, the injection needle, the cassette bottle 1 and the injection pen cooperate to configure the liquid medicine or inject the medicine. The injection pen discharges the liquid medicine through the stainless steel needle during use. The product distributes the expected dose through the dose adjustment of the injection pen.

[0164] In a specific embodiment, the injection pen provided by the present application is a multi-dose adjustable multi-use pre-filled medicine injection pen, which includes an injection button 12, a clutch 11, a dose hub 7, a push rod sleeve 5, a limiting screw cap 10, a push rod 4, a push rod buckle 9, a pen body 6, a push rod screw cap 3, and a cartridge holder 8. The dose hub 7 is rotated and the injection button 12 is pressed, so as to be used for injection.

[0165] During dose setting and dose correction, clutch 11 moves axially with dose hub 7, but clutch 11 does not rotate; at the same time, push rod sleeve 5 has no rotational energy, so push rod 4 does not move axially or rotationally. During injection, clutch 11 moves axially and rotationally with dose hub 7, while driving push rod sleeve 5, which imparts rotational energy to push rod 4, so that push rod 4 moves axially through push rod nut 3 to expel medicament.

[0166] In particular, in use, the operator turns dose hub 7 until the desired dose is visible in window 64. Once the desired dose is set, the operator presses injection button 12 until the set dose is completely injected. Injection is confirmed when dose indicia 77 on dose hub 7 is displayed as 0 in window 64 on pen body 6.

[0167] When the operator rotates dose hub 7 distally to adjust the maximum dose, the distal-most edge of limit window 78 on dose hub 7 hits the distal-most thread 63 inside pen body 6, which prevents dose hub 7 from moving distally further, thereby limiting the operator from increasing the dose further.

[0168] When clutch 11 is not rotating synchronously with dose hub 7 (dose adjustment), limit nut 10, which is threaded with clutch 11, moves axially with dose hub 7, which also causes corresponding axial displacement distally or proximally, the amount of which is determined by the pitch on clutch 11. When limit nut 10 is turned to the distal-most end, reaching the end of the thread on clutch 11, it limits further rotation of dose hub 7, so the user cannot rotate distally to increase the dose further. When injecting, since clutch 11 rotates synchronously with dose hub 7, limit nut 10 remains at the axial position on clutch 11 before injection.

[0169] It should be noted that many of the components mentioned in this application are standard components or components known to those skilled in the art, the structure and principle of which can be known by those skilled in the art through technical manuals or through conventional experimental methods.

[0170] It should be noted that in this specification, relational terms such as first and second are used merely to distinguish one entity from another entity, and do not necessarily require or imply that there is any such actual relationship or order between the entities.

[0171] The injection pen and the clutch device thereof provided by the application are described in detail above. The principles and implementation manners of the application are described by using specific examples in this paper, and the above description of the examples is only used to help understand the method of the application and the core idea thereof. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. An injection pen clutching device, characterized in that, The injection pen comprises: a pen body; an injection mechanism arranged in the pen body, the injection mechanism being used to implement a bolus injection of a liquid medicine in a cartridge; a dose hub arranged in the pen body, the dose hub being movable along an axial direction of the pen body to adjust a bolus injection volume; a clutch used to drive the injection mechanism to implement a bolus injection action, the clutch being arranged in the dose hub, the clutch being movable along an axial direction of the pen body, the clutch having two states of abutting coupling and decoupling with the dose hub in a movement path of the clutch.

2. The injection pen clutch device of claim 1, wherein, A limiting elastic arm is arranged at a proximal end of the dose hub, and a limiting groove is arranged at a distal end of the dose hub; a movement range of the clutch in the dose hub is limited by the limiting elastic arm and the limiting groove.

3. The injection pen clutch device of claim 2, wherein, A linkage protrusion is arranged at a distal end of the clutch, and a linkage spline is arranged at a distal end of the dose hub, the linkage spline being used to abut against the linkage protrusion to implement coupling of the clutch with the dose hub when the clutch moves towards the proximal end.

4. The injection pen clutch device of claim 3, wherein, The limiting elastic arm has elasticity, the limiting elastic arm being deformable under extrusion of the proximal end of the clutch, the limiting elastic arm supporting the clutch and the linkage protrusion being decoupled from the linkage spline before the limiting elastic arm reaches a set deformation, and the linkage protrusion abutting against the linkage spline after the limiting elastic arm reaches the set deformation.

5. The injection pen clutch device of claim 4, wherein, A plurality of sound generating rib positions are arranged on an inner wall of the pen body; the dose hub is provided with a sound generating protrusion, the sound generating protrusion being arranged outside the limiting elastic arm; When the clutch is in abutting coupling with the dose hub, the limiting elastic arm is extruded by the proximal end of the clutch, the sound generating protrusion is raised and is out of contact with the sound generating rib position; when the clutch is decoupled from the dose hub, the sound generating protrusion always maintains contact with the sound generating rib position.

6. The injection pen clutch device of claim 5, wherein, The limiting elastic arm and the sound generating protrusion are arranged as one or more pairs and are symmetrically distributed in a circumferential direction of the dose hub.

7. The injection pen clutch device of claim 1, wherein The injection mechanism comprises: a push rod sleeve arranged in the pen body, the push rod sleeve being used to rotate under driving of the clutch, the push rod sleeve being provided with a sound generating tab.

8. An injection pen characterized in that The injection pen clutch device comprises the injection pen clutch device according to any one of claims 1 to 7, and the injection mechanism comprises: a push rod arranged in the pen body, the push rod being used to implement a bolus injection of a liquid medicine in a cartridge under rotation driving of the push rod sleeve.

9. The injection pen of claim 8, wherein, Further comprising: a pen core holder fixedly arranged at a proximal end of the pen body, an interior of the pen core holder being used to mount the cartridge; and / or an injection button rotatably arranged in the clutch, and the injection button being located outside a distal end of the pen body.

10. The injection pen of claim 8, wherein, Further comprising: a push rod nut fixedly arranged at the proximal end of the pen body, the push rod nut being used for the push rod to pass through; wherein an interior of the distal end of the pen body is provided with a threaded body; the dose hub is in threaded cooperation with the threaded body; and / or a first window is arranged at the distal end of the pen body, the first window being used to display a dose mark outside the dose hub.

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