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 pen tube assembly of the feedback optimization type injection pen is used for installing a clamping type bottle, the inner wall of the pen tube assembly is provided with multiple sets of gear-level rib positions evenly distributed in the circumferential direction of the pen tube assembly, and each gear-level rib position extends in the axial direction of the pen tube assembly; the adjusting and pressing assembly is arranged in the pen tube assembly, a protruding structure is arranged on the periphery of the adjusting and pressing assembly, the protruding structure faces the inner wall of the pen tube assembly, and the protruding structure is used for making contact with the gear rib position to generate feedback corresponding to the rotation angle when the adjusting and pressing assembly rotates relative to the pen tube assembly; the push rod assembly is arranged in the pen tube assembly and used for pushing and injecting liquid medicine in the clamping type bottle under rotation driving of the adjusting and pressing assembly. According to the feedback optimization type injection pen, clear and accurate feedback is provided in the using process through contact between the protruding structures and the gear rib positions, and therefore the dosage accuracy and the use experience 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 the existing injection pens have some defects. The dosage adjustment feedback of the injection pens is not precise enough, and the operator has difficulty in obtaining clear tactile and auditory feedback when adjusting the dosage, which may lead to inaccurate dosage setting. Summary of the invention

[0004] The purpose of the present application is to provide a feedback-optimized injection pen, which provides clear and accurate feedback during use through the contact between the raised structure and the level ribs, thereby improving the accuracy of the dosage and the user experience.

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

[0006] A pen tube assembly, used for mounting a cartridge bottle, wherein the inner wall of the pen tube assembly is provided with a plurality of groups of level ribs evenly distributed along the circumference of the pen tube assembly, and each of the level ribs is extended along the axial direction of the pen tube assembly;

[0007] An adjusting and pressing component is arranged inside the pen tube component, and a protruding structure is arranged on the outer periphery of the adjusting and pressing component, and the protruding structure is arranged toward the inner wall of the pen tube component, and the protruding structure is used to contact the gear level rib position when the adjusting and pressing component rotates relative to the pen tube component to generate feedback corresponding to the rotation angle;

[0008] The push rod assembly is arranged inside the pen tube assembly, and the push rod assembly is used to push the liquid medicine in the cartridge bottle under the rotation of the adjusting and pressing assembly.

[0009] In some embodiments, the pen barrel assembly comprises:

[0010] The pen body has the graded ribs on its inner wall;

[0011] A refill holder, fixedly arranged at the proximal end of the pen body, wherein the interior of the refill holder is used for mounting a cartridge bottle;

[0012] A push rod nut is fixedly arranged at the proximal end of the pen body and located at the distal end of the pen core frame, and the push rod nut is used for the push rod assembly to pass through.

[0013] In some embodiments, the distal end of the push rod nut is provided with a first protrusion, and the first protrusion is used to snap into the first positioning hole at the proximal end of the pen body; and / or,

[0014] The push rod nut is provided with a first internal thread, and the first internal thread is used to connect with the push rod assembly; and / or,

[0015] A second protrusion is provided at the proximal end of the push rod nut, and the second protrusion is used to be inserted into the second positioning hole at the distal end of the pen core frame; and / or,

[0016] A third protrusion is provided at the distal end of the pen core frame, and the third protrusion is used to snap into a third positioning hole at the proximal end of the pen body; and / or,

[0017] 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 buffering for the cartridge bottle.

[0018] In some embodiments, the adjusting and pressing assembly includes:

[0019] A push rod sleeve is rotatably arranged inside the pen barrel assembly, the push rod sleeve is used for the push rod assembly to pass through and can drive the push rod assembly to rotate, and the protruding structure includes a first cantilever arranged at the proximal end of the push rod sleeve;

[0020] A clutch is rotatably disposed inside the pen tube assembly and is axially movable, and is used to drive the push rod sleeve to rotate;

[0021] A dose drum is rotatably disposed inside the pen tube assembly and is axially movable. The clutch is disposed inside the dose drum. The dose drum is used to connect with the clutch and realize synchronous movement when the clutch moves toward the proximal end. The protrusion structure includes a first protrusion disposed at the proximal end of the dose drum.

[0022] An injection button is rotatably arranged on the clutch, and the injection button is located outside the pen tube assembly.

[0023] In some embodiments, the proximal end of the push rod sleeve is provided with a conical flange, the pen barrel assembly includes a push rod nut with a conical cavity and a pair of first clamping arms at the distal end, the conical surface of the proximal end of the conical flange is embedded in the conical cavity, and the body of the distal end of the conical flange is clamped by the pair of first clamping arms; and / or,

[0024] A limit block is provided inside the push rod sleeve, the push rod assembly includes a push rod provided with a moving section, the push rod is passed through the inside of the push rod sleeve, and the moving section cooperates with the limit block to realize the axial movement of the push rod and the rotation of the push rod driven by the push rod sleeve; and / or,

[0025] A notched flange is provided at the distal end of the push rod sleeve, and the notched flange is used for the linkage ribs on the inner side of the clutch to be embedded, so as to realize the axial movement of the clutch and the rotation of the push rod sleeve driven by the clutch.

[0026] In some embodiments, a positioning flange is provided at the distal end of the clutch, a limiting elastic arm is provided at the proximal end of the dose drum, a limiting groove is provided at the distal end of the dose drum, the positioning flange abuts against the limiting groove and the proximal end of the clutch abuts against the limiting elastic arm, so as to limit the clutch inside the dose drum, and the clutch is located at a position relatively biased toward the distal end in the dose drum;

[0027] The distal end of the clutch is further provided with a linkage protrusion, and the distal end of the dosage drum is provided with a linkage spline, and the linkage spline is used to connect with the linkage protrusion and realize synchronous movement when the clutch moves toward the proximal end; and / or,

[0028] The distal end of the clutch is provided with a mounting barb, and the mounting barb is used for the mounting step at the proximal end of the injection button to be inserted into.

[0029] In some embodiments, the outer side of the dose drum is provided with a first external thread for connecting with a threaded body inside the pen barrel assembly; and / or,

[0030] The distal end of the dose drum is provided with a spline knob, the spline knob surrounds the proximal end of the injection button; and / or,

[0031] A dose mark is disposed on the outer side of the dose drum, and a first viewing window is disposed at the distal end of the pen tube assembly, wherein the first viewing window is used to display the dose mark; and / or,

[0032] A stop block is disposed at the proximal end of the dose drum, and the stop block is used to abut against the threaded body to limit the maximum axial movement distance generated by the rotation of the dose drum.

[0033] In some embodiments, the proximal end of the dosage drum is provided with a limit spring arm for abutting against the proximal end of the clutch, and the first protrusion is provided on the outer side of the limit spring arm;

[0034] When the clutch is in contact with the dosage wheel hub, the limiting elastic arm is squeezed by the proximal end of the clutch, the sounding protrusion is tilted up and breaks away from the contact with the sounding rib position; when the clutch is released from the contact with the dosage wheel hub, the sounding protrusion always keeps in contact with the sounding rib position.

[0035] In some embodiments, the feedback-optimized injection pen further comprises a limiting nut, wherein the limiting nut is sleeved on the clutch and nested inside the dosage drum.

[0036] In some embodiments, a guide groove is provided on the outer side of the limit nut, and the guide groove is used for the guide rib on the inner side of the dose drum to be embedded to realize the axial movement of the limit nut. A second internal thread is provided on the inner side of the limit nut, and the second internal thread is used to be connected to the second external thread on the outer side of the clutch.

[0037] In some embodiments, the adjustment and pressing assembly includes:

[0038] A push rod sleeve is rotatably arranged inside the pen barrel assembly, the push rod sleeve is used for the push rod assembly to pass through and can drive the push rod assembly to rotate, and the protruding structure includes a one-way toothed disc arranged at the proximal end of the push rod sleeve;

[0039] A clutch is rotatably disposed inside the pen tube assembly and is axially movable, and is used to drive the push rod sleeve to rotate;

[0040] A dose drum is rotatably disposed inside the pen tube assembly and is axially movable. The clutch is disposed inside the dose drum. The dose drum is used to connect with the clutch and realize synchronous movement when the clutch moves toward the proximal end. The protrusion structure includes a first protrusion disposed at the proximal end of the dose drum.

[0041] An injection button, rotatably disposed on the clutch, and the injection button is located outside the pen tube assembly;

[0042] The pen barrel assembly comprises a push rod nut provided with an elastic cantilever, wherein the elastic cantilever contacts the one-way toothed disc, limits the one-way rotation of the push rod sleeve and generates feedback sound during the rotation.

[0043] Compared with the above-mentioned background technology, the feedback-optimized injection pen provided in the present application mainly includes a pen tube assembly, an adjustment and pressing assembly and a push rod assembly. The pen tube assembly is used to install a cartridge bottle. The inner wall of the pen tube assembly is provided with a plurality of groups of step ribs evenly distributed along the circumference of the pen tube assembly, and each step rib is extended along the axial direction of the pen tube assembly; the adjustment and pressing assembly is arranged inside the pen tube assembly, and a protruding structure is provided on the outer periphery of the adjustment and pressing assembly, and the protruding structure is arranged toward the inner wall of the pen tube assembly, and the protruding structure is used to contact with the step ribs when the adjustment and pressing assembly rotates relative to the pen tube assembly to generate feedback corresponding to the rotation angle; the push rod assembly is arranged inside the pen tube assembly, and the push rod assembly is used to push the liquid in the cartridge bottle under the rotation of the adjustment and pressing assembly.

[0044] In the process of using the feedback-optimized injection pen, the operator first installs the cartridge into the pen tube assembly to ensure that the cartridge is accurately positioned. Then, by rotating the adjustment and pressing assembly, the convex structure on its periphery will move along the step ribs on the inner wall of the pen tube assembly. Every time it rotates to a step rib, the operator will feel an obvious feedback, which can be a tactile vibration or an auditory "click" sound, so as to clearly know the current dose setting; it should be noted that in addition to the feedback in the dose setting stage, the feedback can also be reflected in the injection stage. This design allows the operator to obtain intuitive feedback when adjusting the dose, ensuring the accuracy of the dose adjustment. When the operator sets the required dose, by pressing the adjustment and pressing assembly, the action will drive the push rod assembly to move along the axial direction, and then push the liquid in the cartridge to be discharged through the injection needle to complete the injection process. During the injection stage, the same contact mechanism between the convex structure and the step ribs will also provide feedback to the operator, so that the operator can also feel the confirmation of each action during the injection process. During the entire use process, the design of the feedback-optimized injection pen ensures the ease of dosage adjustment and the smoothness of the injection process, improving the convenience and accuracy of the operator in using the feedback-optimized injection pen.

[0045] Combined 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 provides clear and accurate feedback during use through the contact between the raised structure and the level ribs, thereby improving the accuracy of the dosage and the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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.

[0047] FIG1 is a structural diagram of a feedback-optimized injection pen provided in an embodiment of the present application;

[0048] FIG2 is an exploded view of a feedback-optimized injection pen provided in an embodiment of the present application;

[0049] FIG3 is a structural diagram of the level ribs provided in an embodiment of the present application;

[0050] FIG4 is a cross-sectional view of a feedback-optimized injection pen provided in an embodiment of the present application;

[0051] FIG5 is an assembly diagram of a feedback-optimized injection pen provided in an embodiment of the present application;

[0052] FIG6 is a structural diagram of a push rod nut provided in an embodiment of the present application;

[0053] FIG7 is a structural diagram of a push rod nut and a push rod provided in an embodiment of the present application;

[0054] FIG8 is a structural diagram of a push rod nut and a refill holder provided in an embodiment of the present application;

[0055] FIG9 is a structural diagram of a push rod nut and a cartridge bottle provided in an embodiment of the present application;

[0056] FIG10 is a structural diagram of a push rod sleeve and a pen body provided in an embodiment of the present application;

[0057] FIG11 is a structural diagram of a push rod sleeve and a push rod nut provided in an embodiment of the present application;

[0058] FIG12 is a structural diagram of a push rod sleeve and a push rod provided in an embodiment of the present application;

[0059] FIG13 is a structural diagram of a push rod sleeve and a clutch provided in an embodiment of the present application;

[0060] FIG14 is a structural diagram of a dosage drum and a pen body provided in an embodiment of the present application;

[0061] FIG15 is a structural diagram of a dosage drum and a clutch provided in an embodiment of the present application;

[0062] FIG16 is another structural diagram of a dosage drum and a clutch provided in an embodiment of the present application;

[0063] FIG17 is a structural diagram of a clutch and an injection button provided in an embodiment of the present application;

[0064] FIG18 is another structural diagram of a dosage drum and a pen body provided in an embodiment of the present application;

[0065] FIG19 is another structural diagram of the dosage drum and the pen body provided in an embodiment of the present application;

[0066] FIG20 is a structural diagram of a limit nut and a clutch provided in an embodiment of the present application;

[0067] FIG21 is a structural diagram of a limiting nut and a dosage drum provided in an embodiment of the present application;

[0068] FIG22 is a structural diagram of a feedback-optimized injection pen and a needle provided in an embodiment of the present application;

[0069] FIG23 is a structural diagram of a push rod buckle provided in an embodiment of the present application;

[0070] FIG24 is a structural diagram of a push rod buckle and a rubber plug provided in an embodiment of the present application;

[0071] FIG25 is a structural diagram of a refill holder provided in an embodiment of the present application;

[0072] FIG26 is a structural diagram of an injection button provided in an embodiment of the present application;

[0073] FIG27 is a structural diagram of a feedback-optimized injection pen for adjusting dosage provided in an embodiment of the present application;

[0074] FIG28 is a cross-sectional view of a feedback-optimized injection pen for adjusting dosage provided in an embodiment of the present application;

[0075] FIG29 is a structural diagram of a push rod nut and a push rod sleeve provided in another embodiment of the present application;

[0076] FIG30 is a structural diagram of a pen body, a push rod nut, and a pen core frame provided by another embodiment of the present application;

[0077] FIG31 is a structural diagram of a refill holder provided by another embodiment of the present application;

[0078] FIG. 32 is a structural diagram of a pen body provided in another embodiment of the present application.

[0079] in:

[0080] Pen barrel assembly 100,

[0081] Push rod nut 3, first protrusion 31, first clamp arm 32, first internal thread 33, second protrusion 34, positioning spring 35, conical cavity 36, elastic cantilever 37,

[0082] Pen body 6, first positioning hole 61, gear level rib position 62, threaded body 63, first window 64, third positioning hole 65,

[0083] Pen core frame 8, second positioning hole 81, positioning shoulder 82, avoidance groove 83, second viewing window 84, threaded interface 85, third protrusion 86,

[0084] Adjustment and pressing assembly 200,

[0085] Push rod sleeve 5, first cantilever 51, conical flange 52, limit block 53, notch flange 54, one-way toothed disc 55,

[0086] Clutch 11, positioning flange 111, linkage protrusion 112, second external thread 113, linkage rib position 114, installation barb 115,

[0087] 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, first protrusion 79,

[0088] Injection button 12, button surface 121, installation step 122,

[0089] Push rod assembly 300,

[0090] Push rod 4, push rod thread 41, connector 42, motion section 43,

[0091] Push rod buckle 9, caliper plate 91, push surface 92,

[0092] Limiting nut 10, guide groove 101, second internal thread 102,

[0093] Cartridge bottle 1,

[0094] Rubber stopper 2. DETAILED DESCRIPTION

[0095] 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.

[0096] 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.

[0097] Please refer to Figures 1 to 3, wherein Figure 1 is a structural diagram of the feedback-optimized injection pen provided in an embodiment of the present application, Figure 2 is a disassembled diagram of the feedback-optimized injection pen provided in an embodiment of the present application, and Figure 3 is a structural diagram of the level ribs provided in an embodiment of the present application.

[0098] In a first specific implementation, the feedback optimized injection pen provided by the embodiment of the present application mainly includes a barrel assembly 100, an adjustment and pressing assembly 200 and a push rod assembly 300. The barrel assembly 100 is used to install the cartridge bottle 1. The inner wall of the barrel assembly 100 is provided with a plurality of groups of step ribs 62 evenly distributed along the circumference of the barrel assembly 100, and each step rib 62 is extended along the axial direction of the barrel assembly 100; the adjustment and pressing assembly 200 is arranged inside the barrel assembly 100, and a convex structure is arranged on the outer periphery of the barrel assembly 200, and the convex structure is arranged toward the inner wall of the barrel assembly 100, and the convex structure is used to contact the step rib 62 when the adjustment and pressing assembly 200 rotates relative to the barrel assembly 100 to generate feedback corresponding to the rotation angle; the push rod assembly 300 is arranged inside the barrel assembly 100, and the push rod assembly 300 is used to push the liquid in the cartridge bottle 1 under the rotation of the adjustment and pressing assembly 200.

[0099] Optionally, the contact form between the raised structure and the level ribs 62 is one-by-one contact, and the feedback sound has a clear sense of segmentation.

[0100] In the process of using the feedback-optimized injection pen, the operator first installs the cartridge bottle 1 into the pen tube assembly 100 to ensure that the cartridge bottle 1 is accurately positioned. Then, by rotating the adjustment and pressing assembly 200, the convex structure on its periphery will move along the step ribs 62 on the inner wall of the pen tube assembly 100. Every time it rotates to a step rib 62, the operator will feel an obvious feedback, which can be a tactile vibration or an auditory "click" sound, so as to clearly know the current dose setting; it should be noted that in addition to the feedback in the dose setting stage, the feedback can also be reflected in the injection stage. This design allows the operator to obtain intuitive feedback when adjusting the dose, ensuring the accuracy of the dose adjustment. When the operator sets the required dose, by pressing the adjustment and pressing assembly 200, this action will drive the push rod assembly 300 to move along the axial direction, thereby pushing the liquid in the cartridge bottle 1 to be discharged through the injection needle to complete the injection process. During the injection phase, the contact mechanism between the same protrusion structure and the step rib 62 will also provide feedback to the operator, so that the operator can also feel the confirmation of each action during the injection process. Throughout the use process, the design of the feedback-optimized injection pen ensures the simplicity of dose adjustment and the smoothness of the injection process, and improves the convenience and accuracy of the operator in using the feedback-optimized injection pen.

[0101] Combined 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 provides clear and accurate feedback during use through the contact between the raised structure and the gear rib position 62, thereby improving the accuracy of the dosage and the user experience.

[0102] 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.

[0103] As an option, the level ribs 62 may adopt a diamond-shaped rib structure.

[0104] Please refer to Figures 4 and 5, wherein Figure 4 is a cross-sectional view of the feedback-optimized injection pen provided in an embodiment of the present application, and Figure 5 is an assembly view of the feedback-optimized injection pen provided in an embodiment of the present application.

[0105] In some embodiments, the pen barrel assembly 100 includes a pen body 6 , a refill frame 8 and a push rod nut 3 .

[0106] In this embodiment, a step rib 62 is provided on the inner wall of the pen body 6; the refill frame 8 is fixedly arranged at the proximal end of the pen body 6, and the interior of the refill frame 8 is used to install the cartridge bottle 1; the push rod nut 3 is fixedly arranged at the proximal end of the pen body 6 and located at the distal end of the refill frame 8, and the push rod nut 3 is used for the push rod assembly 300 to pass through.

[0107] Specifically, the pen barrel assembly 100 is a key part of the feedback optimized injection pen, which is composed of several main parts to ensure the structural integrity and functionality of the feedback optimized injection pen.

[0108] The pen body 6 is the main part of the pen tube assembly 100, and its inner wall is designed with step ribs 62. These step ribs 62 are evenly distributed along the circumference of the pen body 6 and extend axially, playing a key role in providing rotation feedback for the adjustment and pressing assembly 200. When the adjustment and pressing assembly 200 rotates, the convex structures on its periphery will contact these step ribs 62 one by one, generating clear feedback corresponding to the rotation angle, helping the operator to accurately perceive the progress of the dosage adjustment, and of course, can also provide corresponding feedback during injection.

[0109] The refill holder 8 is another important component, which is fixed to the proximal end of the pen body 6. The refill holder 8 is designed with a space for installing the cartridge bottle 1, ensuring that the cartridge bottle 1 can be stably installed in the feedback-optimized injection pen and the liquid medicine can be smoothly pushed out of the cartridge bottle 1.

[0110] The push rod nut 3 is fixed at the proximal end of the pen body 6 and is located at the distal end of the pen core holder 8. The push rod nut 3 is designed to cooperate with the push rod assembly 300. The push rod assembly 300 passes through the push rod nut 3, and then pushes the liquid medicine in the cartridge bottle 1 for injection. The existence of the push rod nut 3 ensures the stable positioning and smooth movement of the push rod assembly 300. In some cases, the push rod nut 3 and the push rod assembly 300 also have a matching relationship. With the rotation of the push rod assembly 300, the push rod nut 3 can convert the rotation of the push rod assembly 300 into displacement, and then realize the injection of the liquid medicine under the movement of the push rod assembly 300.

[0111] Please refer to FIG. 6 , which is a structural diagram of the push rod nut provided in an embodiment of the present application.

[0112] Please continue to refer to FIG. 3 . In some embodiments, a first protrusion 31 is provided at the distal end of the push rod nut 3 . The first protrusion 31 is used to fit into a first positioning hole 61 at the proximal end of the pen body 6 .

[0113] Optionally, four first protrusions 31 symmetrically distributed in the circumferential direction are provided at the distal end of the push rod nut 3 , which engage 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 .

[0114] Please refer to Fig. 7, which is a structural diagram of a push rod nut and a push rod provided in an embodiment of the present application. In some embodiments, the push rod nut 3 is provided with a first internal thread 33, and the first internal thread 33 is used to connect with the push rod assembly 300.

[0115] As shown in FIG. 7 , the push rod assembly 300 includes a push rod 4 , and a push rod thread 41 is disposed on the outer side of the push rod 4 . The push rod thread 41 engages with the first internal thread 33 to achieve axial displacement when the push rod 4 passes through and rotates relative to the push rod nut 3 .

[0116] Please refer to Figure 8, which is a structural diagram of the push rod nut and the refill frame provided in an embodiment of the present application. In some embodiments, the proximal end of the push rod nut 3 is provided with a second protrusion 34, which is used to snap into the second positioning hole 81 at the distal end of the refill frame 8.

[0117] Optionally, two second protrusions 34 symmetrically distributed in the circumferential direction are provided at the proximal end of the push rod nut 3, and the second protrusions 34 are engaged with the second positioning holes 81 at the distal end of the refill frame 8 to achieve axial and radial fixation of the push rod nut 3 and the refill frame 8.

[0118] Please refer to Figure 9, which is a structural diagram of a push rod nut and a cartridge bottle provided in an embodiment of the present application. In some embodiments, a positioning spring 35 is provided at the proximal end of the push rod nut 3, and the positioning spring 35 is used to locate the axial position of the cartridge bottle 1 and provide a buffer for the cartridge bottle 1.

[0119] As shown in FIG. 9 , 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.

[0120] When in use, the push rod assembly 300 passes through the push rod nut 3 and pushes the rubber plug 2 at the far end of the cartridge bottle 1 to discharge the medicine.

[0121] Please continue to refer to FIG. 4 and FIG. 5 . In some embodiments, the adjusting and pressing assembly 200 includes a push rod sleeve 5 , a clutch 11 , a dose drum 7 and an injection button 12 .

[0122] Please refer to FIG. 10 , which is a structural diagram of a push rod sleeve and a pen body provided in an embodiment of the present application.

[0123] As shown in FIG. 10 , the push rod sleeve 5 is rotatably disposed inside the pen body 6 of the pen tube assembly 100 . The push rod sleeve 5 is used for the push rod assembly 300 to pass through and can drive the push rod assembly 300 to rotate. The protruding structure includes a first cantilever 51 disposed at the proximal end of the push rod sleeve 5 .

[0124] In this embodiment, the first cantilever 51 can be provided as a pair and symmetrically distributed, and the first cantilever 51 at the proximal end abuts against the step ribs 62 extending axially and circumferentially distributed inside the pen body 6, so that when the push rod sleeve 5 rotates, it can indirectly contact the pen body 6 to make a sound. In addition, the contact relationship between the first cantilever 51 at the proximal end and the step ribs 62 can also provide basic resistance to prevent the push rod sleeve 5 from rotating when it does not receive a rotational force, thereby improving the accuracy of the push rod sleeve 5 starting.

[0125] It should be noted that the first cantilever 51 here is used to generate feedback during the injection stage of the feedback-optimized injection pen. That is, when the feedback-optimized injection pen is used for injection, as the push rod sleeve 5 rotates, the first cantilever 51 on the push rod sleeve 5 and the gear rib position 62 generate feedback, and the feedback sense includes touch and hearing.

[0126] Please refer to FIG11 , which is a structural diagram of a push rod sleeve and a push rod nut provided in an embodiment of the present application. Further, in the rotatable arrangement of the push rod sleeve 5 relative to the pen barrel assembly 100 , a conical flange 52 is provided at the proximal end of the push rod sleeve 5 , and the pen barrel assembly 100 includes a push rod nut 3 having a conical cavity 36 and a pair of first clamping arms 32 at the distal end, the conical surface of the proximal end of the conical flange 52 is embedded in the conical cavity 36 , and the main body of the distal end of the conical flange 52 is clamped by the pair of first clamping arms 32 .

[0127] As shown in FIG. 11 , the cross section of the conical cavity 36 is an inclined surface. The conical cavity 36 accommodates the outer shape of the proximal end of the conical flange 52 . A pair of first clamping arms 32 clamp the distal end body of the conical flange 52 to fix the axial position of the push rod sleeve 5 in the push rod nut 3 .

[0128] Please refer to Figure 12, which is a structural diagram of a push rod sleeve and a push rod provided in an embodiment of the present application. Further, in the setting that the push rod sleeve 5 is provided for the push rod assembly 300 to pass through and can drive the push rod assembly 300 to rotate, a limit block 53 is provided inside the push rod sleeve 5, and the push rod assembly 300 includes a push rod 4 provided with a moving section 43, the push rod 4 is passed through the push rod sleeve 5, and the moving section 43 cooperates with the limit block 53 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.

[0129] As shown in FIG. 12 , 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 .

[0130] In some embodiments, the clutch 11 is rotatably disposed inside the pen barrel assembly 100 , and the clutch 11 is axially movable. The clutch 11 is used to drive the push rod sleeve 5 to rotate.

[0131] As an option, please refer to Figure 13, which is a structural diagram of the push rod sleeve and the clutch provided in the embodiment of the present application. The far end of the push rod sleeve 5 is provided with a notch flange 54, and the notch flange 54 is used for the linkage rib 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.

[0132] As shown in Figure 13, 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.

[0133] Please refer to Figure 14, which is a structural diagram of a dose drum and a pen body provided in an embodiment of the present application. In some embodiments, the dose drum 7 is rotatably disposed inside the pen tube assembly 100, and the dose drum 7 is axially movable, and a clutch 11 is disposed inside the dose drum 7. The dose drum 7 is used to connect with the clutch 11 and realize synchronous movement when the clutch 11 moves toward the proximal end, and the protrusion structure includes a first protrusion 79 disposed at the proximal end of the dose drum 7.

[0134] In this embodiment, the first protrusions 79 can also be arranged in a pair and symmetrically distributed, and abut against the axially extending step ribs 62 distributed circumferentially inside the pen body 6, so as to make indirect contact with the pen body 6 and produce a sound when the dosage drum 7 rotates.

[0135] It should be noted that the first protrusion 79 here is used to generate feedback during the dose setting stage of the feedback-optimized injection pen. That is, when the dose is set using the feedback-optimized injection pen, as the dose drum 7 rotates, the first protrusion 79 on the dose drum 7 and the gear rib position 62 generate feedback, and the feedback sense includes tactile and auditory sense.

[0136] Please refer to Figure 15, which is a structural diagram of the dosage drum and the clutch provided in the embodiment of the present application. Further, in the arrangement in which the clutch 11 is provided inside the dosage drum 7, a positioning flange 111 is provided at the distal end of the clutch 11, a limiting elastic arm 72 is provided at the proximal end of the dosage drum 7, a limiting groove 75 is provided at the distal end of the dosage drum 7, 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 inside the dosage drum 7, and the clutch 11 is located in a relatively distal position in the dosage drum 7.

[0137] As shown in Figure 15, the positioning flange 111 is located at the distal end of the clutch 11, and the positioning flange 111 abuts against the limiting groove 75 on the inner side of the distal end of the dose drum 7, and the proximal end of the clutch 11 abuts against the limiting spring arm 72 on the inner side of the dose drum 7, so as to limit the axial position of the clutch 11 inside the dose drum 7, which is relatively biased to the distal position.

[0138] Please refer to Figure 16, which is another structural diagram of the dosage drum and the clutch provided in the embodiment of the present application. The distal end of the clutch 11 is also provided with a linkage protrusion 112, and the distal end of the dosage drum 7 is provided with a linkage spline 74, which is used to connect with the linkage protrusion 112 and realize synchronous movement when the clutch 11 moves toward the proximal end.

[0139] In this embodiment, when the clutch 11 is in a position biased toward the proximal end in the dose drum 7, the linkage spline 74 located on the inner side of the distal end of the dose drum 7 is used to engage with the symmetrical linkage protrusion 112 at the distal end of the clutch 11 to achieve radial engagement, thereby realizing the function of synchronous rotation of the dose drum 7 and the clutch 11.

[0140] In some embodiments, the injection button 12 is rotatably disposed on the clutch 11 , and the injection button 12 is located outside the pen barrel assembly 100 .

[0141] Please refer to Figure 17, which is a structural diagram of the clutch and injection button provided in the embodiment of the present application. The far end of the clutch 11 is provided with a mounting barb 115, and the mounting barb 115 is used for the mounting step 122 at the proximal end of the injection button 12 to be engaged.

[0142] As shown in FIG. 17 , the mounting barb 115 is located at the distal end of the clutch 11 , and the mounting barb 115 engages with 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.

[0143] In some embodiments, please refer to FIG18 , which is another structural diagram of the dosage drum and the pen body provided in the embodiment of the present application. The outer side of the dosage drum 7 is provided with a first external thread 71 for connecting with the threaded body 63 inside the pen tube assembly 100 .

[0144] As shown in FIG. 18 , the threaded body 63 can be provided in two sections, and the first external thread 71 is engaged with the two sections of the threaded body 63 at the inner distal end of the pen body 6 , ensuring that the dosage drum 7 can only make specific axial movement and synchronous rotation in the pen body 6 according to the thread pitch.

[0145] Please refer to FIG19 , which is another structural diagram of the dosage drum and the pen body provided in the embodiment of the present application. A spline knob 76 is provided at the distal end of the dosage drum 7 , and the spline knob 76 surrounds the proximal end of the injection button 12 .

[0146] As shown in FIG19 , the spline knob 76 may be radial spline or toothed, which facilitates the operator to turn and adjust the dosage. The operator sets the desired dosage by turning the knob-shaped portion. The proximal portion of the injection button 12 is shielded by the inner space of the spline knob 76 in the radial region, making the two more spatially combined and integrated.

[0147] Please continue to refer to FIG. 19 . A dosage mark 77 is provided on the outer side of the dosage drum 7 . A first viewing window 64 is provided at the distal end of the pen tube assembly 100 . The first viewing window 64 is used to display the dosage mark 77 .

[0148] 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.

[0149] Please continue to refer to FIG. 14 . A stop block is provided at the proximal end of the dose drum 7 . The stop block is used to abut against the threaded body 63 to limit the maximum axial movement distance generated by the rotation of the dose drum 7 .

[0150] As an option, 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. As shown in FIG14 , 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.

[0151] In a specific embodiment, please continue to refer to FIG. 14 , the proximal end of the dosage drum 7 is provided with a limit spring arm 72 for abutting against the proximal end of the clutch 11 , and the first protrusion 79 is provided on the outer side of the limit spring arm 72 ;

[0152] When the clutch 11 is in contact with the dosage wheel hub 7, the limiting spring arm 72 is squeezed by the proximal end of the clutch 11, and the sounding protrusion 79 is lifted up and disengaged from the sounding rib position 62; when the clutch 11 is no longer in contact with the dosage wheel hub 7, the sounding protrusion 79 always maintains contact with the sounding rib position 62.

[0153] In this embodiment, the limiting elastic arm 72 is an elastic structure, and the limiting elastic arm 72 can be regarded as a seesaw. The part of the limiting elastic arm 72 that abuts against the clutch 11 is located at one end of the seesaw, and the part of the limiting elastic arm 72 connected to the first protrusion 79 is located at the other end of the seesaw.

[0154] During the dose setting stage, the clutch 11 does not move toward the proximal end, and the dose drum 7 and the clutch 11 are not connected through the linkage protrusion 112 and the linkage spline 74. At this time, the limit 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 first protrusion 79 generates feedback with the gear rib position 62.

[0155] During the injection stage, the operator presses the injection button 12, at which time the clutch 11 moves toward the proximal end, the dose drum 7 is connected to the clutch 11 through the linkage protrusion 112 and the linkage spline 74, the limit spring arm 72 is squeezed by the clutch 11, the limit spring arm 72 tilts up and drives the first protrusion 79 to break contact with the gear rib 62, so the first protrusion 79 does not generate feedback during the injection stage, and the feedback during the injection stage is generated by the first cantilever 51.

[0156] Therefore, the feedback-optimized injection pen has different components that generate feedback at different stages. In the dose setting stage, the component that generates feedback is the dose drum 7, and in the injection stage, the component that generates feedback is the push rod sleeve 5. This avoids feedback interference between different components at different stages, making the feedback more accurate and effective.

[0157] In addition, due to the elastic effect of the limiting elastic arm 72, when the limiting elastic arm 72 has not yet undergone a sufficiently large deformation 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 undergoes a sufficiently large deformation due to the movement of the clutch 11 toward the proximal end, the linkage spline 74 at the distal end of the 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.

[0158] Please refer to Figures 20 and 21, Figure 20 is a structural diagram of the limit nut and the clutch provided in the embodiment of the present application, and Figure 21 is a structural diagram of the limit nut and the dose drum provided in the embodiment of the present application. In some embodiments, the feedback optimized injection pen further includes a limit nut 10, which is sleeved on the clutch 11 and is nested inside the dose drum 7.

[0159] Specifically, please continue to refer to Figures 20 and 21. A guide groove 101 is provided on the outer side of the limit nut 10. The guide groove 101 is used for the guide rib 73 on the inner side of the dose drum 7 to be embedded to achieve axial movement of the limit nut 10. A second internal thread 102 is provided on the inner side of the limit 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.

[0160] As shown in Figures 20 and 21, the guide ribs 73 extend axially on the inner side of the dose drum 7, and the symmetrical guide ribs 73 are engaged with the symmetrical guide grooves 101 on the outer side of the limit nut 10, so as to limit the limit nut 10 to only rotate synchronously with the dose drum 7 and to move axially along the guide ribs 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.

[0161] Please refer to FIG. 22 , which is a structural diagram of a feedback-optimized injection pen and a needle provided in an embodiment of the present application.

[0162] In a specific embodiment, the feedback optimized injection pen provided in the present application is a pen-type syringe, the proximal end of which is an injection end connected to a medicine cartridge such as a cartridge bottle 1, and the distal end is an adjustment end for adjusting the injection dose; a dose mark 77 is provided in the first window 64, and a spline knob 76 is also provided at the distal end. When the spline knob 76 is rotated, the dose drum 7 can be driven to rotate and axially displace; an injection button 12 is also provided at the distal end. When the injection button 12 is pressed, the dose drum 7 can be pushed to move toward the injection end.

[0163] The feedback-optimized injection pen sets the feedback (same meaning as feedback) structure at the position of the dose drum 7 relative to the proximal end, and triggers the feedback effect by using the dose drum 7 and the level rib position 62 inside the pen body 6. The feedback can be more consistent and there is enough space for adjustment. Whether it is the increase in sound volume or the force of the pause, it is easier to achieve and easier because the position space for triggering the sound is sufficient and the structure is simpler. In addition, the feedback-optimized injection pen has different components that generate feedback at different stages. In the dose setting stage, the component that generates feedback is the dose drum 7, and in the injection stage, the component that generates feedback is the push rod sleeve 5. Feedback interference between different components at different stages is avoided, making the feedback more accurate and effective.

[0164] The cartridge 1 applicable to the present application is basically consistent with the specifications of common cartridge products. The parts used in the feedback-optimized injection pen can be made of various plastics (ABS, POM, nylon, etc.), and can also have different specifications and structures. When in use, the injection needle, the cartridge 1 and the feedback-optimized injection pen cooperate to configure the liquid medicine or inject the medicine. During use, the feedback-optimized injection pen discharges the liquid medicine through the stainless steel needle, and the product distributes the expected dose through the adjustment of the dose of the feedback-optimized injection pen.

[0165] Please refer to Fig. 23, which is a structural diagram of a push rod buckle provided in an embodiment of the present application. In some embodiments, the push rod assembly 300 includes a push rod 4 and a push rod buckle 9.

[0166] As shown in Figure 23, the proximal end of the push rod buckle 9 is provided with a pushing surface 92, and the distal end of the push rod buckle 9 is provided with a caliper plate 91. The caliper plate 91 is engaged with the connecting head 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.

[0167] Please refer to Figure 24, which is a structural diagram of the push rod buckle and the rubber plug provided in the embodiment of the present application. The push surface 92 at the proximal end of the push rod buckle 9 is close to the rubber plug 2 of the cartridge bottle 1, serving as a contact surface for the feedback-optimized injection pen to push the rubber plug 2.

[0168] Please refer to Figure 25, which is a structural diagram of the refill frame provided in the embodiment of the present application. A threaded interface 85 is provided at the proximal end of the refill frame 8 for installing a disposable needle. The interior of the refill frame 8 is hollow and the distal end is open, and is used to install the cartridge bottle 1. The refill frame 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 refill frame 8 is provided with a second positioning hole 81, a positioning shoulder 82 and an avoidance groove 83, and is connected to the refill frame 8 through the second positioning hole 81. The positioning shoulder 82 is axially positioned with the pen body 6, and the avoidance groove 83 is circumferentially located between adjacent second positioning holes 81.

[0169] Please refer to Figure 26, which is a structural diagram of the injection button provided in the embodiment of the present application. 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, which is used to provide the operator with a better touch when pressing.

[0170] Please refer to Figure 27, which is a structural diagram of the dosage adjustment of the feedback-optimized injection pen provided in the embodiment of the present application. The feedback-optimized injection pen provided in the present application is a multi-dose adjustable and multi-use prefilled drug feedback-optimized injection pen, comprising an injection button 12, a clutch 11, a dosage drum 7, a push rod sleeve 5, a limit nut 10, a push rod 4, a push rod buckle 9, a pen body 6, a push rod nut 3, and a pen core holder 8. Rotate the dosage drum 7 and press the injection button 12 to perform injection.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] Please refer to FIG. 28, which is a cross-sectional view of the feedback-optimized injection pen for adjusting the dose provided by the embodiment of the present application. When the operator rotates the dose drum 7 to adjust the dose (the injection button 12 is not pressed proximally), the proximal first cantilever 51 of the push rod sleeve 5 abuts against the circumferentially distributed and axially extended gear ribs 62 inside the pen body 6, thereby limiting the rotation of the push rod sleeve 5; the distal notch flange 54 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 first protrusion 79 of the proximal limit spring arm 72 will intermittently contact the gear ribs 62 inside the pen body 6, so as to produce the feel and sound when adjusting the dose.

[0176] 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; because 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 first cantilever 51 of the push rod sleeve 5 cooperates with the circumferentially distributed and axially extended step ribs 62 inside the pen body 6 to produce intermittent contact, so as to produce a hand feel and sound when injecting a dose.

[0177] 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.

[0178] Please refer to Figure 29, which is a structural diagram of a push rod nut and a push rod sleeve provided in another embodiment of the present application.

[0179] In some cases, the protruding structure at the proximal end of the push rod sleeve 5 is changed. In this case, the protruding structure includes a one-way toothed disc 55 provided at the proximal end of the push rod sleeve 5, and the clutch 11, the dosage drum 7 and the injection button 12 in the adjustment and pressing assembly 200 are not changed. Corresponding to the one-way toothed disc 55, the push rod nut 3 is provided with an elastic cantilever 37. The one-way toothed disc 55 contacts the elastic cantilever 37, restricting the one-way rotation of the push rod sleeve 5 and generating feedback sound when rotating.

[0180] In this embodiment, the contact between the one-way toothed disc 55 on the push rod sleeve 5 and the elastic cantilever 37 not only limits the reverse rotation of the push rod sleeve 5, but also generates sound feedback through the interaction with the elastic cantilever 37 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 55 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 the reverse rotation.

[0181] It should be noted that the push rod sleeve 5 may have both the first cantilever 51 and the one-way toothed disc 55 , or may only have one of the two, which should all fall within the scope of the description of this application.

[0182] As an option, the number of the elastic cantilevers 37 is a pair, and the pair of elastic cantilevers 37 are symmetrically arranged in the circumferential direction of the push rod nut 3 .

[0183] Please refer to Figures 30 to 32, wherein Figure 30 is a structural diagram of a pen body, a push rod nut, and a refill frame provided in another embodiment of the present application, Figure 31 is a structural diagram of a refill frame provided in another embodiment of the present application, and Figure 32 is a structural diagram of a pen body provided in another embodiment of the present application.

[0184] In some cases, the fixing method of the push rod nut 3, the pen body 6 and the refill frame 8 is changed. The second protrusion 34 and the second positioning hole 81 can be discarded, and the fixation of the push rod nut 3 and the refill frame 8 is cancelled. A third protrusion 86 is set at the distal end of the refill frame 8, and a third positioning hole 65 is set at the proximal end of the pen body 6. The refill frame 8 is directly fixed to the pen body 6 through the cooperation between the third protrusion 86 and the third positioning hole 65.

[0185] Optionally, four symmetrical third 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 third protrusions 86 .

[0186] 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.

[0187] 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.

[0188] 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: A pen tube assembly, used for mounting a cartridge bottle, wherein the inner wall of the pen tube assembly is provided with a plurality of groups of level ribs evenly distributed along the circumference of the pen tube assembly, and each of the level ribs is extended along the axial direction of the pen tube assembly; An adjusting and pressing component is arranged inside the pen tube component, and a protruding structure is arranged on the outer periphery of the adjusting and pressing component, and the protruding structure is arranged toward the inner wall of the pen tube component, and the protruding structure is used to contact the gear level rib position when the adjusting and pressing component rotates relative to the pen tube component to generate feedback corresponding to the rotation angle; The push rod assembly is arranged inside the pen tube assembly, and the push rod assembly is used to push the liquid medicine in the cartridge bottle under the rotation of the adjusting and pressing assembly.

2. The feedback optimized injection pen according to claim 1, characterized in that: The pen barrel assembly comprises: The pen body has the graded ribs on its inner wall; A refill holder, fixedly arranged at the proximal end of the pen body, wherein the interior of the refill holder is used for mounting a cartridge bottle; A push rod nut is fixedly arranged at the proximal end of the pen body and located at the distal end of the pen core frame, and the push rod nut is used for the push rod assembly to pass through.

3. The feedback optimized injection pen according to claim 2, characterized in that: A first protrusion is provided at the distal end of the push rod nut, and the first protrusion is used to be inserted into a first positioning hole at the proximal end of the pen body; and / or, The push rod nut is provided with a first internal thread, and the first internal thread is used to connect with the push rod assembly; and / or, A second protrusion is provided at the proximal end of the push rod nut, and the second protrusion is used to be inserted into the second positioning hole at the distal end of the pen core frame; and / or, A third protrusion is provided at the distal end of the pen core frame, and the third protrusion is used to snap into a third positioning hole at the proximal end of the pen body; and / or, 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 buffering for the cartridge bottle.

4. The feedback optimized injection pen according to claim 1, characterized in that: The adjusting and pressing assembly comprises: A push rod sleeve is rotatably arranged inside the pen barrel assembly, the push rod sleeve is used for the push rod assembly to pass through and can drive the push rod assembly to rotate, and the protruding structure includes a first cantilever arranged at the proximal end of the push rod sleeve; A clutch is rotatably disposed inside the pen tube assembly and is axially movable, and is used to drive the push rod sleeve to rotate; A dose drum is rotatably disposed inside the pen tube assembly and is axially movable. The clutch is disposed inside the dose drum. The dose drum is used to connect with the clutch and realize synchronous movement when the clutch moves toward the proximal end. The protrusion structure includes a first protrusion disposed at the proximal end of the dose drum. An injection button is rotatably arranged on the clutch, and the injection button is located outside the pen tube assembly.

5. The feedback optimized injection pen according to claim 4, characterized in that: The proximal end of the push rod sleeve is provided with a conical flange, the pen barrel assembly includes a push rod nut with a conical cavity and a pair of first clamping arms at the distal end, the conical surface of the proximal end of the conical flange is embedded in the conical cavity, and the body of the distal end of the conical flange is clamped by the pair of first clamping arms; and / or, A limit block is provided inside the push rod sleeve, the push rod assembly includes a push rod provided with a moving section, the push rod is passed through the inside of the push rod sleeve, and the moving section cooperates with the limit block to realize the axial movement of the push rod and the rotation of the push rod driven by the push rod sleeve; and / or, A notched flange is provided at the distal end of the push rod sleeve, and the notched flange is used for the linkage ribs on the inner side of the clutch to be embedded, so as to realize the axial movement of the clutch and the rotation of the push rod sleeve driven by the clutch.

6. The feedback optimized injection pen according to claim 4, characterized in that: The distal end of the clutch is provided with a positioning flange, the proximal end of the dosage drum is provided with a limiting spring arm, the distal end of the dosage drum is provided with a limiting groove, the positioning flange abuts against the limiting groove and the proximal end of the clutch abuts against the limiting spring arm, so as to limit the clutch inside the dosage drum, and the clutch is located in a position relatively biased toward the distal end in the dosage drum; The distal end of the clutch is further provided with a linkage protrusion, and the distal end of the dosage drum is provided with a linkage spline, and the linkage spline is used to connect with the linkage protrusion and realize synchronous movement when the clutch moves toward the proximal end; and / or, The distal end of the clutch is provided with a mounting barb, and the mounting barb is used for the mounting step at the proximal end of the injection button to be inserted into.

7. The feedback optimized injection pen according to claim 4, characterized in that: The outer side of the dose drum is provided with a first external thread for connecting with the threaded body inside the pen tube assembly; and / or, The distal end of the dose drum is provided with a spline knob, the spline knob surrounds the proximal end of the injection button; and / or, A dose mark is disposed on the outer side of the dose drum, and a first viewing window is disposed at the distal end of the pen tube assembly, wherein the first viewing window is used to display the dose mark; and / or, A stop block is disposed at the proximal end of the dose drum, and the stop block is used to abut against the threaded body to limit the maximum axial movement distance generated by the rotation of the dose drum.

8. The feedback optimized injection pen according to claim 4, characterized in that: The proximal end of the dosage drum is provided with a limit spring arm for abutting against the proximal end of the clutch, and the first protrusion is provided on the outer side of the limit spring arm; When the clutch is in contact with the dosage wheel hub, the limiting elastic arm is squeezed by the proximal end of the clutch, the sounding protrusion is tilted up and breaks away from the contact with the sounding rib position; when the clutch is released from the contact with the dosage wheel hub, the sounding protrusion always keeps in contact with the sounding rib position.

9. The feedback optimized injection pen according to claim 4, characterized in that: The feedback-optimized injection pen further comprises a limiting nut, which is sleeved on the clutch and nested inside the dosage drum.

10. The feedback optimized injection pen according to claim 9, characterized in that: A guide groove is provided on the outer side of the limit nut, and the guide groove is used for the guide rib on the inner side of the dose drum to be embedded to realize the axial movement of the limit nut. A second internal thread is provided on the inner side of the limit nut, and the second internal thread is used to be connected to the second external thread on the outer side of the clutch.

11. The feedback optimized injection pen according to claim 1, characterized in that: The adjusting and pressing assembly comprises: A push rod sleeve is rotatably arranged inside the pen barrel assembly, the push rod sleeve is used for the push rod assembly to pass through and can drive the push rod assembly to rotate, and the protruding structure includes a one-way toothed disc arranged at the proximal end of the push rod sleeve; A clutch is rotatably disposed inside the pen tube assembly and is axially movable, and is used to drive the push rod sleeve to rotate; A dose drum is rotatably disposed inside the pen tube assembly and is axially movable. The clutch is disposed inside the dose drum. The dose drum is used to connect with the clutch and realize synchronous movement when the clutch moves toward the proximal end. The protrusion structure includes a first protrusion disposed at the proximal end of the dose drum. An injection button, rotatably disposed on the clutch, and the injection button is located outside the pen tube assembly; The pen barrel assembly comprises a push rod nut provided with an elastic cantilever, wherein the elastic cantilever contacts the one-way toothed disc, limits the one-way rotation of the push rod sleeve and generates feedback sound during the rotation.

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