Feedback optimization type injection pen

Abstract

The invention discloses a feedback optimization type injection pen, and relates to the technical field of medical instruments, a push rod nut is arranged on a pen body, and the push rod nut is provided with an elastic cantilever; the 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 is positioned through a push rod nut, the push rod sleeve is provided with a one-way fluted disc, and the one-way fluted disc makes contact with the elastic cantilever, limits one-way rotation of the push rod sleeve and feeds back sound during rotation. The push rod is arranged in the push rod sleeve, is in threaded connection with the push rod nut, is driven by the push rod sleeve to rotate and moves under the action of threads of the push rod nut so as to push and inject liquid medicine in the clamping type bottle. According to the feedback optimization type injection pen, the one-way fluted disc is arranged on the push rod sleeve and makes contact with the elastic cantilever, one-way rotation of the push rod sleeve is limited, sound is fed back during rotation, the problem that injection feedback of an existing injection pen is not accurate enough is effectively solved, and the accuracy and reliability of injection dosage are improved.

Description

Technical Field

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

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

[0003] In practice, the inventors have found that existing injection pens have some defects: the injection feedback of the injection pen is not accurate enough, because there is a risk of reverse rotation during the injection process, which makes it difficult for users to judge whether the injection dose is accurate based on the injection sound alone. Summary of the invention

[0004] The purpose of the present application is to provide a feedback-optimized injection pen, which effectively solves the problem of inaccurate injection feedback in existing injection pens by arranging a one-way toothed disk on the push rod sleeve to contact the elastic cantilever, thereby limiting the one-way rotation of the push rod sleeve and generating feedback sound during rotation, thereby improving the accuracy and reliability of the injection dose.

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

[0006] Pen body;

[0007] A push rod nut is arranged on the pen body, and the push rod nut is provided with an elastic cantilever;

[0008] Injection mechanism, including:

[0009] A push rod sleeve, when the push rod sleeve rotates relative to the pen body, the push rod nut locates the axial position, the push rod sleeve is provided with a one-way toothed disc, the one-way toothed disc contacts the elastic cantilever, limits the one-way rotation of the push rod sleeve and generates feedback sound when rotating;

[0010] A push rod is arranged on 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 the elastic cantilever is multiple, and the multiple elastic cantilever are symmetrically arranged in the circumferential direction of the push rod nut;

[0012] The one-way toothed disc is arranged at the proximal end of the push rod sleeve.

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

[0014] In some embodiments, a positioning spring is provided at the proximal end of the push rod nut, and the positioning spring is used to locate the axial position of the cartridge bottle and provide a buffer 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, and the first protrusion cooperates with the first positioning hole.

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

[0017] A refill holder, arranged on the pen body, wherein the interior of the refill holder is used for mounting a cartridge bottle;

[0018] Wherein, a second positioning hole is provided at the proximal end of the pen body; a second convex block is provided at the distal end of the pen core frame, and the second convex block cooperates with the second positioning hole.

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

[0020] A clutch is rotatably disposed inside the pen body, the clutch is used to drive the push rod sleeve to rotate, and the clutch can move axially;

[0021] A dosage drum is threadedly connected to the pen body, the clutch is arranged inside the dosage drum, and the dosage drum and the clutch have two states of abutment coupling and separation decoupling at different moving positions of the clutch;

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

[0023] In some embodiments, a plurality of groups of sound-generating ribs are provided on the inner wall of the pen body, and the plurality of groups of sound-generating ribs are distributed along the inner circumference of the pen body;

[0024] A sound-generating protrusion is provided at the proximal end of the dosage drum, and the sound-generating protrusion contacts the sound-generating rib position, and feedback sounds when the dosage drum rotates.

[0025] In some embodiments, a limiting elastic arm is provided at the proximal end of the dose drum, and a limiting groove and a linkage spline are provided at the distal end of the dose drum;

[0026] A linkage protrusion is provided at the distal end of the clutch, and the movement range of the clutch in the dose drum is limited by the limit spring arm and the limit 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 dose drum.

[0027] In some embodiments, the sound-generating protrusion is disposed on the outer side of the position-limiting elastic arm;

[0028] The limit spring arm is elastic and can be deformed under the pressure of the proximal end of the clutch;

[0029] Before the limit elastic arm reaches the set deformation, the limit elastic arm props up the clutch, so that the linkage protrusion is separated from the linkage spline, and the sounding protrusion maintains contact with the sounding rib position;

[0030] After the limit elastic arm reaches the set deformation, the linkage protrusion and the linkage spline are abutted against each other, and the sounding protrusion is tilted and is out of contact with the sounding rib position.

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

[0032] A limiting nut is arranged on the clutch, and the limiting nut is nested inside the dosage drum. A guide groove is arranged on the outer side of the limiting nut, and the guide groove is used for the guide rib on the inner side of the dosage drum to be embedded so as to realize the axial movement of the limiting nut. A second internal thread is arranged on the inner side of the limiting nut, and the second internal thread is used to be connected to the second external thread on the outer side of the clutch.

[0033] Compared with the above-mentioned background technology, the feedback-optimized injection pen provided in the present application mainly includes a pen body, a push rod nut and an injection mechanism. The push rod nut is arranged on the pen body, and the push rod nut is provided with 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, the axial position is positioned by the push rod nut. The push rod sleeve is provided with a one-way toothed disk, and the one-way toothed disk contacts the elastic cantilever to limit the one-way rotation of the push rod sleeve and generate feedback sound during rotation; the push rod is arranged on 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 injection of the liquid in the cartridge bottle.

[0034] When in use, the injection mechanism drives the push rod to rotate through the rotation of the push rod sleeve, and the push rod sleeve converts the movement of the push rod, so that the push rod can move and then inject the medicine. The rotation angle of the push rod sleeve corresponds to the movement distance of the push rod, and then corresponds to the injection amount of the medicine.

[0035] A major problem with existing injection pen technology is that injection feedback is not precise enough. This is because during the injection process, the plunger sleeve may rotate in the opposite direction, making it difficult for the user to accurately judge whether the injection dose is correct based on the sound of the injection. This inaccuracy may lead to inaccurate drug dosage, which may affect the treatment effect or cause potential health risks.

[0036] To address this problem, the feedback optimized injection pen provided in this application improves the accuracy and reliability of the injection dosage through a series of innovative designs. The push rod nut is provided with elastic cantilevers, which are in contact with the one-way toothed disc on the push rod sleeve. At the same time, when the push rod sleeve rotates relative to the pen body, the push rod nut locates its axial position through these elastic cantilevers. This design ensures the axial stability of the push rod sleeve and reduces the dosage error caused by reverse rotation.

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

[0038] In combination with the above structure and process description, it can be seen that the feedback-optimized injection pen has at least the following beneficial effects: the feedback-optimized injection pen sets a one-way toothed disk on the push rod sleeve to contact the elastic cantilever, thereby limiting the one-way rotation of the push rod sleeve and generating feedback sound during rotation, thereby effectively solving the problem of inaccurate injection feedback in existing injection pens and improving the accuracy and reliability of injection dosages. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0040] FIG1 is a schematic diagram of a feedback-optimized injection pen provided in an embodiment of the present application;

[0041] FIG2 is an exploded view of a feedback-optimized injection pen provided in an embodiment of the present application;

[0042] FIG3 is a cross-sectional view of a feedback-optimized injection pen provided in an embodiment of the present application;

[0043] FIG4 is a schematic diagram of a push rod nut and a push rod sleeve provided in an embodiment of the present application;

[0044] FIG5 is a schematic diagram of a pen body, a push rod nut, and a pen core holder provided in an embodiment of the present application;

[0045] FIG6 is a schematic diagram of a refill holder provided in an embodiment of the present application;

[0046] FIG7 is a schematic diagram of a push rod and a push rod nut provided in an embodiment of the present application;

[0047] FIG8 is a schematic diagram of a push rod and a push rod buckle provided in an embodiment of the present application;

[0048] FIG9 is a schematic diagram of a push rod and a push rod sleeve provided in an embodiment of the present application;

[0049] FIG10 is a schematic diagram of a push rod sleeve provided in an embodiment of the present application;

[0050] FIG11 is a schematic diagram of a push rod sleeve and a clutch provided in an embodiment of the present application;

[0051] FIG12 is a schematic diagram of a clutch and a dosage drum provided in an embodiment of the present application;

[0052] FIG13 is another schematic diagram of a clutch and a dosage drum provided in an embodiment of the present application;

[0053] FIG14 is a schematic diagram of a dosage drum provided in an embodiment of the present application;

[0054] FIG15 is a schematic diagram of a dosage drum and a pen body provided in an embodiment of the present application;

[0055] FIG16 is a schematic diagram of a pen body provided in an embodiment of the present application;

[0056] FIG17 is a schematic diagram of a clutch and an injection button provided in an embodiment of the present application;

[0057] FIG18 is a structural diagram of a limit nut and a clutch provided in an embodiment of the present application;

[0058] FIG. 19 is a structural diagram of a limit nut and a dosage drum provided in an embodiment of the present application.

[0059] in:

[0060] Cartridge bottle 1,

[0061] Rubber stopper 2,

[0062] Push rod nut 3, first protrusion 31, first clamp arm 32, first internal thread 33, positioning spring 35, elastic cantilever 36,

[0063] Push rod 4, push rod thread 41, connector 42, motion section 43,

[0064] Push rod sleeve 5, one-way toothed disc 51, positioning step 52, limit block 53, notch flange 54,

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

[0066] Dosage drum 7, first external thread 71, limit spring arm 72, guide rib 73, linkage spline 74, limit groove 75, spline knob 76, dose mark 77, limit window 78, sound emitting protrusion 79,

[0067] Pen core frame 8, second protrusion 81, positioning shoulder 82, avoidance groove 83, second viewing window 84, threaded interface 85,

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

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

[0070] Clutch 11, positioning flange 111, linkage protrusion 112, second external thread 113, linkage rib position 114, installation barb 115,

[0071] Injection button 12 , button surface 121 , and installation step 122 . DETAILED DESCRIPTION

[0072] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0073] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

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

[0075] In the first specific implementation manner, the feedback optimized injection pen provided by the implementation scheme of the present application mainly includes a pen body 6, a push rod nut 3 and an injection mechanism. The push rod nut 3 is arranged on the pen body 6, and the push rod nut 3 is provided with 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, the axial position is positioned by the push rod nut 3. The push rod sleeve 5 is provided with a one-way toothed disk 51. The one-way toothed disk 51 contacts the elastic cantilever 36 to limit the one-way rotation of the push rod sleeve 5 and generate feedback sound during rotation; the push rod 4 is arranged on the push rod sleeve 5, and the push rod 4 is threadedly connected with the push rod nut 3. Specifically, an external thread is arranged on the push rod 4, and an internal thread is arranged on the push rod nut 3. 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 realize the push injection of the liquid in the cartridge bottle 1.

[0076] When 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 so that the push rod 4 can move, thereby injecting the medicine. The rotation angle of the push rod sleeve 5 corresponds to the movement distance of the push rod 4, and then corresponds to the injection amount of the medicine.

[0077] In the existing injection pen technology, there is a major problem that the injection feedback is not accurate enough. This is because during the injection process, the push rod sleeve 5 may rotate in the opposite direction, making it difficult for the user to accurately judge whether the injection dose is correct based on the sound during the injection. This inaccuracy may lead to inaccurate drug dosage, thereby affecting the treatment effect or causing potential health risks.

[0078] To address this problem, the feedback optimized injection pen provided in the present application improves the accuracy and reliability of the injection dose through a series of innovative designs. The push rod nut 3 is provided with elastic cantilevers 36, which are in contact with the one-way toothed disc 51 on the push rod sleeve 5. At the same time, when the push rod sleeve 5 rotates relative to the pen body 6, the push rod nut 3 locates its axial position through these elastic cantilevers 36. This design ensures the axial stability of the push rod sleeve 5 and reduces the dosage error 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 limits the reverse rotation of the push rod sleeve 5, but also generates sound feedback through the interaction with the elastic cantilever 36 when the push rod sleeve 5 rotates unidirectionally. This sound feedback provides a clear signal to the user that the injection dose is being accurately delivered. Since the one-way toothed disc 51 limits the reverse rotation of the push rod sleeve 5, any sound feedback corresponds to the forward dose delivery, thereby eliminating the uncertainty caused by reverse rotation.

[0080] In combination with the above structure and process description, it can be seen that the feedback-optimized injection pen has at least the following beneficial effects: the feedback-optimized injection pen sets a one-way toothed disk 51 on the push rod sleeve 5 to contact the elastic cantilever 36, thereby limiting the one-way rotation of the push rod sleeve 5 and generating feedback sound during rotation, thereby effectively solving the problem of inaccurate injection feedback in existing injection pens and improving the accuracy and reliability of the injection dose.

[0081] It should be noted that the proximal end in this article refers to the side close to the needle and the injection site, that is, the head end of the feedback-optimized injection pen, and the distal end refers to the side opposite to the proximal end, that is, the tail end of the feedback-optimized injection pen. Based on this, each component has its proximal end and distal end, and the proximal ends and distal ends of different components follow the same definition rules.

[0082] Please continue to refer to FIG. 4 . In some embodiments, there are multiple elastic cantilevers 36 , and the multiple elastic cantilevers 36 are symmetrically arranged in the circumferential direction of the push rod nut 3 .

[0083] The one-way toothed disc 51 is disposed at the proximal end of the push rod sleeve 5 .

[0084] In this embodiment, the design of the elastic cantilever 36 adopts a multiple symmetrical arrangement, that is, the number of the elastic cantilever 36 can be two as shown in FIG. 4, or three or more. Compared with the arrangement of a single elastic cantilever 36 and the arrangement of multiple but asymmetrical elastic cantilever 36, this arrangement helps to achieve stable positioning of the push rod nut 3 in the pen body 6 and ensures that the elastic cantilever 36 can evenly contact the one-way toothed disc 55 when the push rod sleeve 5 rotates. The symmetrical elastic cantilever 36 can provide a balanced elastic force, making the positioning of the push rod nut 3 in the axial direction more accurate, and also helps to ensure the stability and uniformity of the push rod sleeve 5 when rotating.

[0085] The one-way toothed disc 55 is arranged at the proximal end of the push rod sleeve 5. There is a force arm distance from the contact point between the one-way toothed disc 55 and the elastic cantilever 36 to the rotation center of the push rod sleeve 5, which meets the requirement of preventing the push rod sleeve 5 from rotating when the push rod sleeve 5 does not receive a rotational force. Since the one-way toothed disc 55 contacts the elastic cantilever 36 at the proximal end of the push rod sleeve 5, a larger contact area and better force transmission efficiency can be provided, thereby generating a clearer and more accurate feedback sound when the push rod sleeve 5 rotates unidirectionally. This design improves the dosage control accuracy of the injection pen, allowing the user to more accurately judge the injection dosage through sound feedback.

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

[0087] In this embodiment, a pair of elastic cantilever arms 36 and a pair of first clamp arms 32 are designed at the distal end of the push rod nut 3. This structural design enables the push rod nut 3 to be closely matched with the push rod sleeve 5. The proximal end surface of the push rod sleeve 5 abuts against the distal end surface of the push rod nut 3 to form a stable contact surface, and this direct contact helps to transmit force and maintain position when the push rod sleeve 5 rotates.

[0088] The proximal periphery of the push rod sleeve 5 is clamped by a pair of first clamping arms 32. This clamping action enhances the stability of the push rod sleeve 5 in the push rod nut 3 and limits the radial displacement of the push rod sleeve 5, thereby ensuring that the push rod sleeve 5 maintains a correct axial position during the injection process when the push rod sleeve 5 rotates. The elastic cantilever 36 is located between the proximal end surface of the push rod sleeve 5 and the first clamping arm 32. Such a layout allows the elastic cantilever 36 to play its elastic role when the push rod sleeve 5 rotates, contact the one-way toothed disc 55 and limit 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 the precise control of the push rod sleeve 5 during the injection process through the coordinated action of the elastic cantilever 36 and the first clamping arm 32. This precise control helps to improve the accuracy of the injection dose and reduce the dose error 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 FIG. 4 . In some embodiments, a positioning spring piece 35 is disposed at the proximal end of the push rod nut 3 . The positioning spring piece 35 is used to locate the axial position of the cartridge bottle 1 and provide a buffer for the cartridge bottle 1 .

[0091] In this embodiment, the positioning spring piece 35 is used to abut against the axial position of one end of the cartridge bottle 1 , and the positioning spring piece 35 also plays a role in protecting the cartridge bottle.

[0092] Please refer to FIG. 5 , which is a schematic diagram of the pen body, the push rod nut, and the refill holder provided in an embodiment of the present 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 , and the first protrusion 31 cooperates with the first positioning hole 61 .

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

[0095] Through the cooperation between the first protrusion 31 and the first positioning hole 61, the push rod nut 3 can be accurately positioned relative to the pen body 6. This positioning mechanism ensures the position stability of the push rod nut 3 in the pen body 6, thereby providing a reliable structural foundation for the injection pen. This stability is crucial to ensure the accuracy and repeatability of the injection dose, because it helps to maintain the correct alignment and movement of the push rod sleeve 5 and the push rod 4 during the injection process.

[0096] In addition, the cooperation between the first protrusion 31 and the first positioning hole 61 also helps to ensure the correct installation direction and position of the push rod nut 3 when assembling and disassembling the injection pen. This design simplifies the assembly process of the injection pen and also makes maintenance and replacement of parts more convenient. In general, this structural design improves the functionality and user experience of the injection pen.

[0097] Please refer to FIG. 6 , which is a schematic diagram of a refill holder provided in an embodiment of the present application.

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

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

[0100] The proximal end of the pen body 6 is provided with a second positioning hole 65 ; the distal end of the pen core holder 8 is provided with a second protrusion 81 , and the second protrusion 81 cooperates with the second positioning hole 65 .

[0101] In this embodiment, the design of the feedback optimized injection pen further includes a cartridge holder 8, which is installed inside the pen body 6, and its main function is to provide a stable installation position for the cartridge bottle 1. Such a design allows the cartridge bottle 1 to be fixed in the injection pen, ensuring stable delivery of the drug solution during the injection process.

[0102] In order to achieve stable positioning of the cartridge 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 cartridge holder 8, and the second protrusion 81 cooperates with the second positioning hole 65. Through this cooperation, the cartridge holder 8 is accurately positioned in the pen body 6, ensuring that the position of the cartridge bottle 1 in the injection pen is fixed to prevent displacement during the injection process.

[0103] The cooperation between the second protrusion 81 and the second positioning hole 65 not only provides a mechanical locking mechanism, but also helps to quickly and accurately position the refill holder 8 during the assembly process. This design simplifies the assembly process of the injection pen, improves production efficiency, and also ensures the consistency and reliability of the final product.

[0104] As shown in FIG6 , the proximal end of the cartridge holder 8 is provided with a threaded interface 85 for installing a disposable needle. The interior of the cartridge holder 8 is hollow and the distal end is open, and is used to install the cartridge bottle 1. The cartridge holder 8 is provided with an axially extending second viewing window 84, which is convenient for the operator to observe the use of the cartridge bottle 1, such as the position of the rubber plug 2 inside the cartridge bottle 1. The distal end of the cartridge holder 8 is provided with a second protrusion 81, a positioning shoulder 82 and an avoidance groove 83, which is connected to the pen body 6 through the second protrusion 81, the positioning shoulder 82 is axially positioned with the pen body 6, and the avoidance groove 83 is located between adjacent second protrusions 81 in the circumferential direction.

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

[0106] As shown in FIG. 7 , a push rod thread 41 is disposed on the outer side of the push rod 4 , and the push rod thread 41 engages with the first internal thread 33 of the push rod nut 3 to achieve axial movement of the push rod 4 when the push rod 4 passes through and rotates relative to the push rod nut 3 .

[0107] As shown in FIG8 , a pushing surface 92 is provided at the proximal end of the push rod buckle 9, and a caliper plate 91 is provided at the distal end of the push rod buckle 9. The caliper plate 91 engages with the connector 42 at the proximal end of the push rod 4 to fix the push rod buckle 9 at the axial position of the proximal end of the push rod 4. When in use, as the push rod 4 moves axially, the pushing surface 92 at the proximal end of the push rod buckle 9 comes close to the rubber plug 2 of the cartridge bottle 1, and the feedback-optimized injection pen pushes the contact surface of the rubber plug 2 to achieve injection of the drug solution.

[0108] As shown in FIG. 9 , the push rod 4 is inserted into the push rod sleeve 5 , and the push rod 4 is provided with a moving section 43 which cooperates with the limit 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 driven by the push rod sleeve 5 .

[0109] Specifically, the moving section 43 is cut in a direction perpendicular to the axial direction, and is consistent with the radial shape of the limit block 53 on the inner side of the push rod sleeve 5, so as to control the push rod 4 to always rotate synchronously with the push rod sleeve 5 and to be able to move freely axially in the push rod sleeve 5.

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

[0111] In some embodiments, the injection mechanism further comprises:

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

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

[0114] The injection button 12 is rotatably disposed on the clutch 11 , and the injection button 12 is exposed from the far end.

[0115] In this embodiment, when the clutch 11 is in a decoupled state from the dose drum 7, the dose drum 7 can rotate independently of the push rod sleeve 5. At this time, the operator can freely adjust the dose without the clutch 11 acting, thereby ensuring the independence and accuracy of the dose adjustment.

[0116] When the clutch 11 is coupled with the dose drum 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 drum 7 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 dose injection through hearing.

[0117] As shown in FIG. 11 , a notched flange 54 is provided at the distal end of the push rod sleeve 5 , and the notched flange 54 is used for the linkage rib 114 inside the clutch 11 to be embedded therein, 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 .

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

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

[0120] In some embodiments, a plurality of groups of sound-generating ribs 62 are provided on the inner wall of the pen body 6, and the plurality of groups of sound-generating ribs 62 are distributed along the inner circumference of the pen body 6;

[0121] A sound-generating protrusion 79 is provided at the proximal end of the dosage drum 7 , and the sound-generating protrusion 79 contacts the sound-generating rib position 62 , and generates feedback sound when the dosage drum 7 rotates.

[0122] In this embodiment, the proximal end of the dosage drum 7 is specially designed with a sound-generating protrusion 79, which contacts the sound-generating ribs 62 on the inner wall of the pen body 6 when the dosage drum 7 rotates. Each contact generates a sound, and this sound feedback provides an intuitive signal to the user, indicating that the dosage 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, so the dosage drum 7 can rotate independently of the push rod sleeve 5. In this state, the sound protrusion 79 on the dosage drum 7 can contact the sound rib position 62 on the inner wall of the pen body 6, and generate a feedback sound corresponding to the rotation angle, which helps 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 transmission relationship of rotational motion between the push rod sleeve 5 and the dosage drum 7, the push rod sleeve 5 will not rotate, and no feedback sound of injection will be generated to cause interference.

[0124] In some embodiments, a limiting elastic arm 72 is provided at the proximal end of the dose drum 7, and a limiting groove 75 and a linkage spline 74 are provided at the distal end of the dose drum 7;

[0125] A linkage protrusion 112 is provided at the distal end of the clutch 11, and the movement range of the clutch 11 in the dose 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 dose drum 7.

[0126] In this embodiment, in the arrangement in which the clutch 11 is provided inside the dose drum 7, a positioning flange 111 is provided at the distal end of the clutch 11, the positioning flange 111 abuts against the limiting groove 75 and the proximal end of the clutch 11 abuts against the limiting elastic arm 72, so as to limit the clutch 11 to the inside of the dose drum 7, and the clutch 11 is located in a position relatively biased toward the distal end in the dose drum 7.

[0127] In the coupling and decoupling setting of the dose drum 7 and the clutch 11, a linkage protrusion 112 is further provided at the distal end of the clutch 11, and a linkage spline 74 is provided at the distal end of the dose drum 7. The linkage spline 74 is used to connect with the linkage protrusion 112 and realize synchronous movement when the clutch 11 moves toward the proximal end.

[0128] In some embodiments, the sound-generating protrusion 79 is disposed on the outer side of the limiting elastic arm 72;

[0129] The limit spring arm 72 is elastic and can be deformed under the pressure of the proximal end of the clutch 11;

[0130] Before the limit elastic arm 72 reaches the set deformation, the limit elastic arm 72 props up the clutch 11, so that the linkage protrusion 112 is separated from the linkage spline 74, and the sounding protrusion 79 keeps in contact with the sounding rib position 62;

[0131] After the limiting elastic arm 72 reaches the set deformation, the linkage protrusion 112 abuts against the linkage spline 74 , and the sounding protrusion 79 tilts up and breaks away from the sounding rib position 62 .

[0132] In this embodiment, the limiting spring arm 72 is an elastic structure, and 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 connected to the sound protrusion 79 is located at the other end of the seesaw.

[0133] During the dose setting stage, the clutch 11 does not move toward the proximal end, and the clutch 11 is decoupled from the dose drum 7. At this time, the limiting spring arm 72 is not squeezed by the clutch 11, and the sounding protrusion 79 always maintains contact with the sounding rib position 62. As the dose drum 7 rotates during the dose setting stage, the sounding protrusion 79 and the sounding rib position 62 generate feedback.

[0134] During the injection stage, the clutch 11 moves toward the proximal end, and the clutch 11 is coupled to the dosage drum 7. At this time, the limiting spring arm 72 is squeezed by the clutch 11, and the limiting spring arm 72 is tilted and drives the sounding protrusion 79 to break contact with the sounding rib position 62. Therefore, the sounding protrusion 79 does not generate feedback during the injection stage. The feedback during the injection stage only exists in the feedback sound of the one-way toothed disk 51 and the elastic cantilever 36 during injection.

[0135] Therefore, this solution realizes that the components generating feedback at different stages are different. In the dose setting stage, the component generating feedback is the dose drum 7, and in the injection stage, the component generating feedback is the push rod sleeve 5. This avoids feedback interference between different components at different stages, making the feedback more accurate and effective.

[0136] In addition, due to the elastic effect of the limiting elastic arm 72, when the limiting elastic arm 72 has not yet been deformed sufficiently due to the movement of the clutch 11 toward the proximal end, a spacing is left between 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, which is equivalent to the limiting elastic arm 72 supporting the clutch 11, so that the linkage spline 74 is separated from the linkage protrusion 112, and the dose drum 7 and the clutch 11 move independently at this time; when the limiting elastic arm 72 is deformed sufficiently due to the movement of the clutch 11 toward the proximal end, the linkage spline 74 at the distal end of the dose drum 7 is combined with the linkage protrusion 112 at the distal end of the clutch 11, and the dose drum 7 and the clutch 11 move together.

[0137] Please refer to FIG. 16 , which is a schematic diagram of the pen body provided in an embodiment of the present application.

[0138] As shown in FIG16 , four symmetrical first positioning holes 61 are provided on the pen body 6, and the push rod nut 3 is fixed in the pen body 6 by cooperating with four symmetrical first protrusions 31. Four symmetrical second positioning holes 65 are provided on the pen body 6, and the pen core holder 8 is fixed in the pen body 6 by cooperating with four symmetrical second protrusions 81. The sound-generating ribs 62 extend axially inside the pen body 6 and are distributed circumferentially, and make a sound when the dose drum 7 rotates. A threaded body 63 is provided inside the pen body 6, and the dose drum 7 is threadedly connected in the pen body 6 by cooperating with the first external thread 71. The threaded body 63 can be provided in two sections, and the first external thread 71 is interlocked with the two sections of the threaded body 63 at the inner distal end of the pen body 6, so as to ensure that the dose drum 7 can only make specific axial movement and synchronous rotation in the pen body 6 according to the thread pitch. A first window 64 is provided at the distal end of the pen body 6, and the first window 64 is used to display the dose mark 77 on the dose drum 7. As the dose drum 7 rotates, the dose mark 77 in the first window 64 changes. The dosage mark 77 may be a plurality of printed numbers. The dosage mark 77 of the dosage drum 7 is displayed through the first viewing window 64 at the far end, so that the operator can easily identify the current usage status of the feedback optimized injection pen.

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

[0140] As shown in FIG. 17 , the distal end of the clutch 11 is provided with a mounting hook 115 for engaging the mounting step 122 at the proximal end of the injection button 12 to combine and fix the relative axial position of the injection button 12 and the clutch 11 and allow the two parts to rotate.

[0141] The distal end of the dose drum 7 is provided with a spline knob 76, which surrounds the proximal end of the injection button 12. The spline knob 76 may be radially splined or toothed, which facilitates the operator to dial and adjust. The operator sets the desired dose by turning the knob-shaped portion. The proximal end of the injection button 12 is shielded by the internal space of the spline knob 76 in the radial region, so that the two have a stronger sense of spatial combination and integrity.

[0142] As shown in FIG. 15 , a stop block is provided at the proximal end of the dose drum 7 , and 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 limit window 78 is provided at the proximal end of the dose drum 7, and the limit window 78 can be used as a stop block to realize the rotation stop function. When the dose drum 7 rotates and moves relative to the pen body 6, one of the two threaded bodies 63 at the distal end of the inner side of the pen body 6 at the proximal end will abut against the limit window 78 at the proximal end of the dose drum 7, so as to limit the maximum axial displacement of the dose drum 7 in the pen body 6.

[0144] Please refer to Figures 18 and 19, wherein Figure 18 is a structural diagram of a limit nut and a clutch provided in an embodiment of the present application, and Figure 19 is a structural diagram of a limit nut and a dosage drum provided in an embodiment of the present application.

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

[0146] The limiting nut 10 is arranged on the clutch 11. The limiting nut 10 is nested in the dosage drum 7. A guide groove 101 is provided on the outer side of the limiting nut 10. The guide groove 101 is used for the guide rib 73 on the inner side of the dosage drum 7 to be embedded so as to realize the axial movement of the limiting nut 10. A second internal thread 102 is provided on the inner side of the limiting nut 10. The second internal thread 102 is used to be connected to the second external thread 113 on the outer side of the clutch 11.

[0147] In this embodiment, the guide rib 73 extends axially on the inner side of the dosage drum 7, and the symmetrical guide rib 73 is engaged with the symmetrical guide groove 101 on the outer side of the limit nut 10, so as to limit the limit nut 10 to only rotate synchronously with the dosage drum 7 and to move axially along the guide rib 73. The second internal thread 102 on the inner side of the limit nut 10 is engaged with the second external thread 113 of the clutch 11, so as to control the limit nut 10 to always perform specific axial displacement and rotation according to the second external thread 113 of the clutch 11.

[0148] In a specific embodiment, the feedback-optimized injection pen provided in the present application is a multi-dose adjustable multiple-use prefilled drug feedback-optimized injection pen, including a push rod nut 3, a push rod 4, a push rod sleeve 5, a pen body 6, a dose drum 7, a refill holder 8, a push rod buckle 9, a limit nut 10, a clutch 11, and an injection button 12. Rotate the dose drum 7 and press the injection button 12 to perform injection.

[0149] The present application is different from similar products currently on the market in terms of component structure and parts matching. Through the design of the matching of the pen body 6 and the dosage drum 7, the operator's touch and sound when adjusting the dosage become more precise and easy to adjust, eliminating the need for other products to use multiple parts and springs to achieve the effect.

[0150] During dose setting and dose correction, the clutch 11 moves axially with the dose drum 7, but the clutch 11 does not rotate; at the same time, the push rod sleeve 5 has no rotational kinetic energy, so the push rod 4 does not move axially or rotationally. During injection, the clutch 11 moves axially and rotationally with the dose drum 7, and drives the push rod sleeve 5, driving the push rod 4 to generate rotational kinetic energy, so that the push rod 4 moves axially through the push rod nut 3 to discharge the medicine.

[0151] The dosage drum 7 also includes a plurality of dosage marks 77 corresponding to the plurality of dosage units visible in the window 64 provided on the pen body 6. The operator rotates the dosage drum 7 until the desired dosage is visible in the window 64. Once the desired dosage is set, the operator presses the injection button 12 until the set dosage is completely injected. When the dosage mark 77 on the dosage drum 7 is displayed as 0 in the window 64 on the pen body 6, it is used as a confirmation that the injection is completed.

[0152] When the operator rotates the dose drum 7 toward the distal end to adjust the maximum dose, the limit window 78 at the proximal end of the dose drum 7 presses against the threaded body 63 at the distal end of the pen body 6, wherein the proximal side prevents the dose drum 7 from continuing to move toward the distal end, thereby limiting the operator from continuing to increase the dose.

[0153] When the operator rotates the dose drum 7 to adjust the dose (the injection button 12 is not pressed toward the proximal end), 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 notched flange 54 at the distal end of the push rod sleeve 5 limits the clutch 11 and the push rod sleeve 5 from rotating synchronously. When the dose drum 7 is rotated, the outer sounding protrusion 79 of the proximal limit elastic arm 72 will intermittently contact the sounding rib 62 inside the pen body 6, so as to produce the feel and sound when adjusting the dose.

[0154] When the operator presses the injection button 12, the relative axial position of the clutch 11 in the dose drum 7 moves toward the proximal end. 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 dose drum 7, forcing the clutch 11 to rotate synchronously with the dose drum 7; the limit spring arm 72 on the inner side of the proximal end of the dose drum 7 will deform inward, so that the rotation of the dose drum 7 will not cooperate with the pen body 6 and make a sound; since the clutch 11 rotates, the push rod sleeve 5 is driven to rotate synchronously, so the push rod 4 rotates with the push rod sleeve 5 and discharges the required dose; the proximal one-way toothed disc 51 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 hand feel and sound when injecting a dose.

[0155] When the clutch 11 does not rotate synchronously with the dose drum 7 (dose adjustment), the limit nut 10 threadedly matched with the clutch 11 will move axially with the dose drum 7, and also produce corresponding axial displacement toward the distal end or toward the proximal end. The amount of displacement is determined by the pitch of the clutch 11. When the limit nut 10 rotates to the farthest end and reaches the end of the thread of the clutch 11, it will limit the further rotation of the dose drum 7, so that the user can no longer rotate it toward the distal end to increase the dose adjustment. When injecting, since the clutch 11 rotates synchronously with the dose drum 7, the limit nut 10 will maintain the axial position on the clutch 11 before injection.

[0156] It should be noted that many of the components mentioned in this application are universal standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0157] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0158] The above is a detailed introduction to the feedback optimized injection pen provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A feedback optimized injection pen, characterized in that: include: Pen body; A push rod nut is arranged on the pen body, and the push rod nut is provided with an elastic cantilever; Injection mechanism, including: A push rod sleeve, when the push rod sleeve rotates relative to the pen body, the push rod nut locates the axial position, the push rod sleeve is provided with a one-way toothed disc, the one-way toothed disc contacts the elastic cantilever, limits the one-way rotation of the push rod sleeve and generates feedback sound when rotating; A push rod is arranged on 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.

2. The feedback optimized injection pen according to claim 1, characterized in that: There are multiple elastic cantilevers, and the multiple elastic cantilevers are symmetrically arranged in the circumferential direction of the push rod nut; The one-way toothed disc is arranged at the proximal end of the push rod sleeve.

3. The feedback optimized injection pen according to claim 2, characterized in that: 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 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.

4. The feedback optimized injection pen according to claim 1, characterized in that: A positioning spring is provided at the proximal end of the push rod nut, and the positioning spring is used to locate the axial position of the cartridge bottle and provide a buffer 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, and the first protrusion cooperates with the first positioning hole.

5. The feedback optimized injection pen according to claim 1, characterized in that: Also includes: A refill holder, arranged on the pen body, wherein the interior of the refill holder is used for mounting a cartridge bottle; Wherein, a second positioning hole is provided at the proximal end of the pen body; a second convex block is provided at the distal end of the pen core frame, and the second convex block cooperates 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: A clutch is rotatably disposed inside the pen body, the clutch is used to drive the push rod sleeve to rotate, and the clutch can move axially; A dosage drum is threadedly connected to the pen body, the clutch is arranged inside the dosage drum, and the dosage drum and the clutch have two states of abutment coupling and separation decoupling at different moving positions of the clutch; An injection button is rotatably arranged on the clutch, and the injection button is exposed from the distal end.

7. The feedback optimized injection pen according to claim 6, characterized in that: A plurality of groups of sound-generating ribs are arranged on the inner wall of the pen body, and the plurality of groups of sound-generating ribs are distributed along the inner circumference of the pen body; A sound-generating protrusion is provided at the proximal end of the dosage drum, and the sound-generating protrusion contacts the sound-generating rib position, and feedback sounds 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 elastic arm, and the distal end of the dosage drum is provided with a limiting groove and a linkage spline; A linkage protrusion is provided at the distal end of the clutch, and the movement range of the clutch in the dose drum is limited by the limit spring arm and the limit 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 dose drum.

9. The feedback optimized injection pen according to claim 8, characterized in that: The sound-generating protrusion is arranged on the outer side of the position-limiting elastic arm; The limit spring arm is elastic and can be deformed under the pressure of the proximal end of the clutch; Before the limit elastic arm reaches the set deformation, the limit elastic arm props up the clutch, so that the linkage protrusion is separated from the linkage spline, and the sounding protrusion maintains contact with the sounding rib position; After the limit elastic arm reaches the set deformation, the linkage protrusion and the linkage spline are abutted against each other, and the sounding protrusion is tilted and is out of contact with the sounding rib position.

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

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