Feedback optimized injection pen

Abstract

The application discloses a feedback-optimized injection pen, and relates to the technical field of medical devices. A pen tube assembly of the feedback-optimized injection pen is used for mounting a cassette bottle. A plurality of gear level positions are arranged on the inner wall of the pen tube assembly and are uniformly distributed along the circumference of the pen tube assembly. Each gear level position extends along the axial direction of the pen tube assembly. An adjusting and pressing assembly is arranged inside the pen tube assembly. The outer periphery of the adjusting and pressing assembly is provided with a protruding structure. The protruding structure is arranged towards the inner wall of the pen tube assembly. The protruding structure is used for contacting the gear level positions when the adjusting and pressing assembly rotates relative to the pen tube assembly, thereby generating feedback corresponding to the rotation angle. A push rod assembly is arranged inside the pen tube assembly. The push rod assembly is used for pushing the liquid medicine in the cassette bottle under the driving of the rotation of the adjusting and pressing assembly. The feedback-optimized injection pen provides clear and accurate feedback in the use process, thereby improving the accuracy of the dose and the use experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an injection pen with optimized feedback. BACKGROUND

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

[0003] In practice, the inventors have found that the existing injection pen has some defects. The dose adjustment feedback of the injection pen is not accurate enough, and the operator has difficulty in obtaining clear tactile and auditory feedback when adjusting the dose, which may lead to inaccurate dose setting. SUMMARY

[0004] The purpose of the present application is to provide an injection pen with optimized feedback, which provides clear and accurate feedback during use through the contact between the protruding structure and the gear level position, thereby improving the accuracy of the dose and the user experience.

[0005] To achieve the above-mentioned purpose, the present application provides an injection pen with optimized feedback, comprising:

[0006] A pen tube assembly for mounting a cartridge, the inner wall of the pen tube assembly is provided with a plurality of gear level positions uniformly distributed along the circumference of the pen tube assembly, and each gear level position is arranged along the axial direction of the pen tube assembly;

[0007] An adjustment and pressing assembly arranged inside the pen tube assembly, the outer circumference of the adjustment and pressing assembly is provided with a protruding structure, the protruding structure is arranged towards the inner wall of the pen tube assembly, and the protruding structure is used to contact the gear level position and generate feedback corresponding to the rotation angle when the adjustment and pressing assembly rotates relative to the pen tube assembly;

[0008] A push rod assembly arranged inside the pen tube assembly, the push rod assembly is used to push the drug liquid in the cartridge under the rotation of the adjustment and pressing assembly.

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

[0010] A pen body, the inner wall of which is provided with the gear level position;

[0011] A cartridge holder fixedly arranged at the proximal end of the pen body, the interior of the cartridge holder is used to mount a cartridge;

[0012] A push rod nut fixedly arranged at the proximal end of the pen body and located at the distal end of the cartridge holder, 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 for being clamped into a first positioning hole in the proximal end of the barrel; and / or,

[0014] The push rod nut is provided with a first internal thread for being connected with the push rod assembly; and / or,

[0015] The proximal end of the push rod nut is provided with a second protrusion for being clamped into a second positioning hole in the distal end of the cartridge holder; and / or,

[0016] The distal end of the cartridge holder is provided with a third protrusion for being clamped into a third positioning hole in the proximal end of the barrel; and / or,

[0017] The proximal end of the push rod nut is provided with a positioning spring for positioning the axial position of the cartridge and providing a buffer for the cartridge.

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

[0019] A push rod sleeve is rotatably arranged inside the barrel assembly, the push rod sleeve is used for allowing the push rod assembly to pass through and rotating the push rod assembly, and the protruding structure comprises a first cantilever arranged at the proximal end of the push rod sleeve;

[0020] A clutch is rotatably arranged inside the barrel assembly and is axially movable, the clutch is used for rotating the push rod sleeve;

[0021] A dose drum is rotatably arranged inside the barrel assembly and is axially movable, the inside of the dose drum is provided with the clutch, the dose drum is used for being connected with the clutch and realizing synchronous movement when the clutch moves towards the proximal end, and the protruding structure comprises a first protrusion arranged at the proximal end of the dose drum;

[0022] An injection button is rotatably arranged at the clutch and is located outside the barrel assembly.

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

[0024] The inside of the push rod sleeve is provided with a limiting block, the push rod assembly comprises a push rod provided with a movement section, the push rod passes through the inside of the push rod sleeve, and the movement section cooperates with the limiting block to realize the axial movement of the push rod and the rotation of the push rod under the driving of the push rod sleeve; and / or,

[0025] The distal end of the push rod sleeve is provided with a notch flange for the linkage rib inside 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, the distal end of the clutch is provided with a positioning flange, the proximal end of the dose drum is provided with a limiting elastic arm, and the distal end of the dose 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 elastic arm, so as to realize the limitation of the clutch inside the dose drum, and the clutch is located at a relatively distally biased position in the dose drum;

[0027] The distal end of the clutch is further provided with a linkage protrusion, and the distal end of the dose drum is provided with a linkage spline for abutting against and realizing synchronous movement with the linkage protrusion when the clutch moves towards the proximal end; and / or,

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

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

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

[0031] The outer side of the dose drum is provided with a dose mark, and the distal end of the pen tube assembly is provided with a first window for displaying the dose mark; and / or,

[0032] The proximal end of the dose drum is provided with a cut-off stopper for abutting 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 dose drum is provided with a limiting elastic arm for abutting against the proximal end of the clutch, and the first protrusion is arranged outside the limiting elastic arm;

[0034] When the clutch abuts against the dose drum, the limiting elastic arm is extruded by the proximal end of the clutch, the first protrusion is lifted and out of contact with the gear level rib; when the clutch is disengaged from the dose drum, the first protrusion always maintains contact with the gear level rib.

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

[0036] In some embodiments, the limiting nut is provided with a guide groove on the outer side thereof, the guide groove being used for embedding the guide rib on the inner side of the dose drum to realize the axial movement of the limiting nut, and the inner side of the limiting nut is provided with a second inner thread, the second inner thread being used for connecting with the second outer thread on the outer side of the clutch.

[0037] In some embodiments, the adjusting and pressing assembly comprises:

[0038] A push rod sleeve is rotatably arranged inside the pen tube assembly, the push rod sleeve is used for penetrating the push rod assembly and can drive the push rod assembly to rotate, and the protruding structure comprises a one-way gear disc arranged at the proximal end of the push rod sleeve.

[0039] A clutch is rotatably arranged inside the pen tube assembly, and the clutch is axially movable, the clutch is used for driving the push rod sleeve to rotate.

[0040] A dose drum is rotatably arranged inside the pen tube assembly, and the dose drum is axially movable, the inner part of the dose drum is provided with the clutch, the dose drum is used for connecting with the clutch and realizing synchronous movement when the clutch moves towards the proximal end, and the protruding structure comprises a first protrusion arranged at the proximal end of the dose drum.

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

[0042] The pen tube assembly comprises a push rod nut provided with an elastic cantilever, the elastic cantilever is in contact with the one-way gear disc, the one-way rotation of the push rod sleeve is limited, and sound feedback is generated when rotating.

[0043] With respect to the above background technology, the feedback-optimized injection pen provided in the present application mainly comprises a pen tube assembly, an adjusting and pressing assembly, and a push rod assembly, the pen tube assembly is used for mounting a cartridge, the inner wall of the pen tube assembly is provided with a plurality of gear level ribs which are uniformly distributed along the circumference of the pen tube assembly, and each gear level rib is arranged along the axial direction of the pen tube assembly; the adjusting and pressing assembly is arranged inside the pen tube assembly, the outer periphery of the adjusting and pressing assembly is provided with a protruding structure, the protruding structure is arranged towards the inner wall of the pen tube assembly, and the protruding structure is used for contacting the gear level rib 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 inside the pen tube assembly, and the push rod assembly is used for pushing the liquid medicine in the cartridge under the driving of the rotation of the adjusting and pressing assembly.

[0044] In the process of using the feedback-optimized injection pen, the operator first installs the vial into the pen tube assembly, ensuring that the vial is positioned accurately. Then, by rotating the adjustment and pressing assembly, the protruding structure on the outer periphery will move along the notch rib on the inner wall of the pen tube assembly. Each time the operator turns to a notch rib, he or she will feel a clear feedback, which can be a tactile vibration or an audible "click" sound, thus clearly knowing 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 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 axially, thereby pushing the liquid medicine in the vial out through the injection needle to complete the injection process. In the injection stage, the same contact mechanism of the protruding structure and the notch rib also provides feedback for the operator, so that the operator can also feel the confirmation of each action during the injection process. Throughout the use process, the feedback-optimized injection pen design ensures the simplicity of dose adjustment and the smoothness of the injection process, improving the convenience and accuracy of the operator using the feedback-optimized injection pen.

[0045] 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 provides clear and accurate feedback in the use process through the contact of the protruding structure and the notch rib, thereby improving the accuracy of the dose and the use experience. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0047] Figure 1 The structural diagram of the feedback-optimized injection pen provided by the embodiments of the present application;

[0048] Figure 2 The exploded view of the feedback-optimized injection pen provided by the embodiments of the present application;

[0049] Figure 3 The structural diagram of the notch rib provided by the embodiments of the present application;

[0050] Figure 4 The cross-sectional view of the feedback-optimized injection pen provided by the embodiments of the present application;

[0051] Figure 5An assembly view of the feedback-optimized injection pen provided by the embodiment of the present application;

[0052] Figure 6 A structure view of the push rod nut provided by the embodiment of the present application;

[0053] Figure 7 A structure view of the push rod nut and the push rod provided by the embodiment of the present application;

[0054] Figure 8 A structure view of the push rod nut and the cartridge holder provided by the embodiment of the present application;

[0055] Figure 9 A structure view of the push rod nut and the cassette bottle provided by the embodiment of the present application;

[0056] Figure 10 A structure view of the push rod sleeve and the pen body provided by the embodiment of the present application;

[0057] Figure 11 A structure view of the push rod sleeve and the push rod nut provided by the embodiment of the present application;

[0058] Figure 12 A structure view of the push rod sleeve and the push rod provided by the embodiment of the present application;

[0059] Figure 13 A structure view of the push rod sleeve and the clutch provided by the embodiment of the present application;

[0060] Figure 14 A structure view of the dose drum and the pen body provided by the embodiment of the present application;

[0061] Figure 15 A structure view of the dose drum and the clutch provided by the embodiment of the present application;

[0062] Figure 16 Another structure view of the dose drum and the clutch provided by the embodiment of the present application;

[0063] Figure 17 A structure view of the clutch and the injection button provided by the embodiment of the present application;

[0064] Figure 18 Another structure view of the dose drum and the pen body provided by the embodiment of the present application;

[0065] Figure 19 Still another structure view of the dose drum and the pen body provided by the embodiment of the present application;

[0066] Figure 20 A structure view of the limit nut and the clutch provided by the embodiment of the present application;

[0067] Figure 21The structure diagram of the limiting nut and the dose drum provided for the embodiment of the present application;

[0068] Figure 22 The structure diagram of the feedback-optimized injection pen and the needle provided for the embodiment of the present application;

[0069] Figure 23 The structure diagram of the push rod buckle provided for the embodiment of the present application;

[0070] Figure 24 The structure diagram of the push rod buckle and the rubber plug provided for the embodiment of the present application;

[0071] Figure 25 The structure diagram of the cartridge holder provided for the embodiment of the present application;

[0072] Figure 26 The structure diagram of the injection button provided for the embodiment of the present application;

[0073] Figure 27 The structure diagram of the feedback-optimized injection pen adjusting dose provided for the embodiment of the present application;

[0074] Figure 28 The cross-sectional diagram of the feedback-optimized injection pen adjusting dose provided for the embodiment of the present application;

[0075] Figure 29 The structure diagram of the push rod nut and the push rod sleeve provided for another embodiment of the present application;

[0076] Figure 30 The structure diagram of the pen body, the push rod nut, and the cartridge holder provided for another embodiment of the present application;

[0077] Figure 31 The structure diagram of the cartridge holder provided for another embodiment of the present application;

[0078] Figure 32 The structure diagram of the pen body provided for another embodiment of the present application.

[0079] Wherein:

[0080] The pen tube assembly 100,

[0081] The push rod nut 3, the first protrusion 31, the first clamping arm 32, the first internal thread 33, the second protrusion 34, the positioning elastic sheet 35, the conical cavity 36, the elastic cantilever 37,

[0082] The pen body 6, the first positioning hole 61, the gear step position 62, the threaded body 63, the first window 64, the third positioning hole 65,

[0083] The cartridge holder 8, the second positioning hole 81, the positioning shoulder 82, the avoiding groove 83, the second window 84, the threaded interface 85, the third protrusion 86,

[0084] adjusting and pressing assembly 200,

[0085] push rod sleeve 5, first cantilever 51, conical flange 52, limiting block 53, notched flange 54, one-way tooth disc 55,

[0086] clutch 11, positioning flange 111, linkage protrusion 112, second external thread 113, linkage rib 114, mounting barb 115,

[0087] dose drum 7, first external thread 71, limiting spring arm 72, guide rib 73, linkage spline 74, limiting groove 75, spline knob 76, dose marking 77, limiting window 78, first protrusion 79,

[0088] injection button 12, button surface 121, mounting step 122,

[0089] push rod assembly 300,

[0090] push rod 4, push rod thread 41, connecting head 42, motion section 43,

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

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

[0093] cassette bottle 1,

[0094] rubber plug 2. DETAILED DESCRIPTION

[0095] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0096] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0097] Please refer to Figures 1 to 3 Among them, Figure 1 the feedback-optimized injection pen structure diagram provided by the embodiments of the present application, Figure 2 the feedback-optimized injection pen exploded view provided by the embodiments of the present application, Figure 3 the structure diagram of the gear level rib provided by the embodiments of the present application.

[0098] In a first specific embodiment, the feedback-optimized injection pen provided by the embodiment scheme of the present application mainly comprises a pen tube assembly 100, an adjusting and pressing assembly 200, and a push rod assembly 300. The pen tube assembly 100 is used for mounting a cassette bottle 1. The inner wall of the pen tube assembly 100 is provided with a plurality of gear level positions 62 which are uniformly distributed along the circumference of the pen tube assembly 100 and are arranged along the axial direction of the pen tube assembly 100. The adjusting and pressing assembly 200 is arranged inside the pen tube assembly 100. The outer circumference of the adjusting and pressing assembly 200 is provided with a protruding structure which is arranged towards the inner wall of the pen tube assembly 100. The protruding structure is used for contacting the gear level positions 62 when the adjusting and pressing assembly 200 rotates relative to the pen tube assembly 100, thereby generating feedback corresponding to the rotation angle. The push rod assembly 300 is arranged inside the pen tube assembly 100. The push rod assembly 300 is used for pushing the liquid medicine in the cassette bottle 1 under the driving of the rotation of the adjusting and pressing assembly 200.

[0099] Optionally, the contacting mode of the protruding structure and the gear level positions 62 is one-by-one contacting, and the feedback sound has a clear paragraph feeling.

[0100] In the process of using the feedback-optimized injection pen, the operator first installs the cassette bottle 1 into the pen tube assembly 100, and ensures that the cassette bottle 1 is accurately positioned. Then, the adjusting and pressing assembly 200 is rotated. The protruding structure on the outer circumference of the adjusting and pressing assembly 200 moves along the gear level positions 62 on the inner wall of the pen tube assembly 100. When the adjusting and pressing assembly 200 is rotated to each gear level position 62, the operator can feel an obvious feedback, which can be a tactile vibration or an audible “click” sound, thereby clearly knowing 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, thereby ensuring the accuracy of dose adjustment. After the operator sets the required dose, the adjusting and pressing assembly 200 is pressed. This action drives the push rod assembly 300 to move along the axial direction, thereby pushing the liquid medicine in the cassette bottle 1 to be discharged through the injection needle, and the injection process is completed. In the injection stage, the same contacting mechanism of the protruding structure and the gear level positions 62 also provides feedback for 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 simplicity of dose adjustment and the smoothness of the injection process, thereby improving the convenience and accuracy of the operator using the feedback-optimized injection pen.

[0101] 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 provides clear and accurate feedback in the use process through the contacting of the protruding structure and the gear level positions 62, thereby improving the accuracy of the dose and the use experience.

[0102] It should be noted that the proximal end herein refers to the side close to the needle and the injection site, i.e. the front end of the feedback-optimized injection pen, and the distal end refers to the side opposite to the proximal end, i.e. the tail end of the feedback-optimized injection pen. Based on this, each component has its proximal end and distal end, and the proximal end and distal end of different components comply with the same definition rules.

[0103] As an option, the step position 62 can adopt a diamond-shaped step position structure.

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

[0105] In some embodiments, the pen tube assembly 100 includes a pen body 6, a cartridge holder 8, and a push rod nut 3.

[0106] In the present embodiment, the inner wall of the pen body 6 is provided with step positions 62; the cartridge holder 8 is fixedly arranged at the proximal end of the pen body 6, and the interior of the cartridge holder 8 is used for mounting the cartridge 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 cartridge holder 8, and the push rod nut 3 is used for allowing the push rod assembly 300 to pass through.

[0107] Specifically, the pen tube 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 the inner wall thereof is designed with step positions 62. These step positions 62 are uniformly distributed along the circumference of the pen body 6 and extend axially, playing a key role in providing rotational feedback for the adjustment and pressing assembly 200. When the adjustment and pressing assembly 200 rotates, the protruding structure on the outer circumference thereof will contact these step positions 62 one by one, generating clear feedback corresponding to the rotation angle, helping the operator accurately perceive the progress of dose adjustment, and of course, providing corresponding feedback during injection.

[0109] The cartridge holder 8 is another important component, which is fixed at the proximal end of the pen body 6. The interior of the cartridge holder 8 is designed with a space for mounting the cartridge 1, ensuring that the cartridge 1 can be stably mounted in the feedback-optimized injection pen, and the drug solution can be smoothly pushed out from the cartridge 1.

[0110] The push rod nut 3 is fixed at the proximal end of the pen body 6 and at the distal end of the cartridge holder 8. The push rod nut 3 is designed to cooperate with the push rod assembly 300, which passes through the push rod nut 3 and then pushes the drug liquid in the cartridge 1 for injection. The presence 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 also cooperates with the push rod assembly 300, and as the push rod assembly 300 rotates, the push rod nut 3 can convert the rotation of the push rod assembly 300 into displacement, and then realize the injection of the drug liquid under the movement of the push rod assembly 300.

[0111] Please refer to Figure 6 , Figure 6 The structure diagram of the push rod nut provided in the embodiments of the present application.

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

[0113] As an option, the distal end of the push rod nut 3 is provided with four first protrusions 31 symmetrically distributed in the circumferential direction, which cooperate with the 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 Figure 7 , Figure 7 The structure diagram of the push rod nut and the push rod provided in the embodiments of the present application. In some embodiments, the push rod nut 3 is provided with a first internal thread 33 for connecting with the push rod assembly 300.

[0115] As shown in Figure 7 , the push rod assembly 300 includes a push rod 4, and the outer side of the push rod 4 is provided with a push rod thread 41 which cooperates with the first internal thread 33 to realize the axial displacement of the push rod 4 when the push rod 4 passes through and rotates relative to the push rod nut 3.

[0116] Please refer to Figure 8 , Figure 8 The structure diagram of the push rod nut and the cartridge holder provided in the embodiments of the present application. In some embodiments, the proximal end of the push rod nut 3 is provided with a second protrusion 34 for clamping into the second positioning hole 81 at the distal end of the cartridge holder 8.

[0117] As an option, the proximal end of the push rod nut 3 is provided with two second protrusions 34 symmetrically distributed in the circumferential direction, which cooperate with the second positioning holes 81 at the distal end of the cartridge holder 8 to realize the axial and radial fixation of the push rod nut 3 and the cartridge holder 8.

[0118] Please refer to Figure 9 , Figure 9The structure diagram of the push rod nut and the cassette bottle is provided in the embodiments of the present application. In some embodiments, the proximal end of the push rod nut 3 is provided with a positioning elastic sheet 35, which is used to position the axial position of the cassette bottle 1 and provide buffering for the cassette bottle 1.

[0119] As shown in Figure 9 , the positioning elastic sheet 35 is used to abut against the axial position of one end of the cassette bottle 1, and the positioning elastic sheet 35 simultaneously plays a role of protecting the cassette bottle.

[0120] In use, the push rod assembly 300 pushes the rubber plug 2 at the distal end of the cassette bottle 1 after passing through the push rod nut 3 to discharge the medicament.

[0121] Please continue to refer to Figure 4 and Figure 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 Figure 10 , Figure 10 The structure diagram of the push rod sleeve and the pen body is provided in the embodiments of the present application.

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

[0124] In the present embodiment, the first cantilever 51 can be provided as a pair and symmetrically distributed. The proximal first cantilever 51 abuts against the axially extending gear level rib 62 distributed circumferentially in the interior of the pen body 6, so that the push rod sleeve 5 can indirectly contact the pen body 6 to emit a sound when rotating. In addition, the contact relationship between the proximal first cantilever 51 and the gear level rib 62 can also provide a basic resistance to avoid the rotation of the push rod sleeve 5 when no rotation force is received, thereby improving the accuracy of the start of the push rod sleeve 5.

[0125] It should be noted that the first cantilever 51 herein is used for feedback generation of the feedback-optimized injection pen in the injection stage, that is, when the feedback-optimized injection pen is used for injection, the first cantilever 51 on the push rod sleeve 5 generates feedback with the gear level rib 62 as the push rod sleeve 5 rotates, and the feedback feeling includes touch and hearing.

[0126] Please refer to Figure 11 , Figure 11The structure diagram of the push rod sleeve and the push rod nut is provided for the embodiment of the present application. Further, in the rotatable arrangement of the push rod sleeve 5 relative to the pen tube assembly 100, the proximal end of the push rod sleeve 5 is provided with a tapered flange 52, the pen tube assembly 100 includes the push rod nut 3 provided with a tapered cavity 36 at the distal end and a pair of first clamping arms 32, the tapered surface of the proximal end of the tapered flange 52 is embedded into the tapered cavity 36, and the main body at the distal end of the tapered flange 52 is clamped by the pair of first clamping arms 32.

[0127] As shown in Figure 11 , the cross section of the tapered cavity 36 is a bevel, the tapered cavity 36 accommodates the outer shape of the proximal end of the tapered flange 52, and the pair of first clamping arms 32 clamps the distal end main body of the tapered flange 52 to realize the axial position of the push rod sleeve 5 in the push rod nut 3.

[0128] Please refer to Figure 12 , Figure 12 The structure diagram of the push rod sleeve and the push rod is provided for the embodiment of the present application. Further, in the arrangement 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, the inside of the push rod sleeve 5 is provided with a limiting block 53, the push rod assembly 300 includes the push rod 4 provided with a movement section 43, the push rod 4 passes through the inside of the push rod sleeve 5, and the movement section 43 cooperates with the limiting block 53 inside the push rod sleeve 5 to realize the axial movement of the push rod 4 and the rotation of the push rod 4 driven by the push rod sleeve 5.

[0129] As shown in Figure 12 , the movement section 43 is cut in the direction perpendicular to the axial direction, and the shape of the movement section 43 is consistent with the shape of the limiting block 53 inside the push rod sleeve 5 in the radial direction, so as to control the push rod 4 to always rotate synchronously with the push rod sleeve 5 and freely move axially in the push rod sleeve 5.

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

[0131] As an option, please refer to Figure 13 , Figure 13 The structure diagram of the push rod sleeve and the clutch is provided for the embodiment of the present application. The distal end of the push rod sleeve 5 is provided with a notched flange 54, the notched flange 54 is used for the linkage muscle 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 13As shown, the number of linkage muscle positions 114 can be selected as four, and the four linkage muscle positions 114 on the inner side of the clutch 11 are connected with the notch flange 54 at the distal end of the push rod sleeve 5, the linkage muscle position 114 is embedded in the notch on the notch flange 54, which is used to limit the synchronous rotation of the push rod sleeve 5 with the clutch 11, and the axial displacement in the clutch 11.

[0133] Please refer to Figure 14 , Figure 14 The structure diagram of the dose drum and the pen body provided by the embodiment of the application. In some embodiments, the dose drum 7 is rotatably arranged inside the pen tube assembly 100, and the dose drum 7 is axially movable. The inside of the dose drum 7 is provided with a clutch 11, and the dose drum 7 is used to be connected with the clutch 11 and realize synchronous movement when the clutch 11 moves towards the proximal end. The protruding structure includes a first protrusion 79 arranged at the proximal end of the dose drum 7.

[0134] In the embodiment, the first protrusion 79 can also be arranged as a pair and symmetrically distributed, and abuts against the gear level muscle position 62 which is circumferentially and axially arranged inside the pen body 6, so as to indirectly contact the pen body 6 and emit a sound when the dose drum 7 rotates.

[0135] It should be noted that the first protrusion 79 herein is used for feedback generation of the feedback-optimized injection pen in the dose setting stage, that is, when the feedback-optimized injection pen is used for dose setting, the first protrusion 79 on the dose drum 7 generates feedback with the gear level muscle position 62, and the feedback feeling includes touch feeling and hearing feeling.

[0136] Please refer to Figure 15 , Figure 15 The structure diagram of the dose drum and the clutch provided by the embodiment of the application. Further, in the arrangement of the clutch 11 inside the dose drum 7, the distal end of the clutch 11 is provided with a positioning flange 111, the proximal end of the dose drum 7 is provided with a limiting elastic arm 72, and the distal end of the dose drum 7 is provided with a limiting groove 75. 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 elastic arm 72 on the inner side of the dose drum 7, so as to realize the limitation of the clutch 11 inside the dose drum 7, and the clutch 11 is located at a position relatively deviated to the distal end in the dose drum 7.

[0137] As shown in Figure 15 , the positioning flange 111 is located at the distal end of the clutch 11, 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 elastic 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, and the position is relatively deviated to the distal end.

[0138] Please refer to Figure 16 , Figure 16Another structure diagram of the dose drum and the clutch provided in the embodiment of the present application. The distal end of the clutch 11 is further provided with a linkage protrusion 112, and the distal end of the dose drum 7 is provided with a linkage spline 74, which is used to be connected with the linkage protrusion 112 and realize synchronous movement when the clutch 11 moves towards the proximal end.

[0139] In the embodiment, when the clutch 11 is in the position deviated towards the proximal end in the dose drum 7, the linkage spline 74 inside the distal end of the dose drum 7 is used to be connected with the symmetrical linkage protrusion 112 of the distal end of the clutch 11 to realize radial combination, so as to realize the function of synchronous rotation of the dose drum 7 and the clutch 11.

[0140] In some embodiments, the injection button 12 can be rotatably arranged in the clutch 11, and the injection button 12 is arranged outside the pen tube assembly 100.

[0141] Please refer to Figure 17 , Figure 17 A structure diagram of the clutch and the injection button provided in the embodiment of the present application. The distal end of the clutch 11 is provided with a mounting barb 115, which is used to be clamped into the mounting step 122 of the proximal end of the injection button 12.

[0142] As shown in Figure 17 , the mounting barb 115 is arranged at the distal end of the clutch 11, and the mounting barb 115 is connected with the mounting step 122 of the proximal end of the injection button 12, so as to combine and fix the relative axial position of the injection button 12 and the clutch 11, and allow the two parts to rotate.

[0143] In some embodiments, please refer to Figure 18 , Figure 18 Another structure diagram of the dose drum and the pen body provided in the embodiment of the present application. The outer side of the dose drum 7 is provided with a first outer thread 71 used to be connected with the threaded body 63 inside the pen tube assembly 100.

[0144] As shown in Figure 18 , the threaded body 63 can be arranged in two sections, and the first outer thread 71 is connected with the two sections of the threaded body 63 at the distal end inside the pen body 6, so as to ensure that the dose drum 7 can only move in a specific axial direction and rotate synchronously in the pen body 6.

[0145] Please refer to Figure 19 , Figure 19 Still another structure diagram of the dose drum and the pen body provided in the embodiment of the present application. 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.

[0146] As shown in Figure 19As shown, the spline knob 76 can be a radial spline or a toothed shape, which facilitates the operator to rotate and adjust. The operator sets the desired dose by rotating the knob. The proximal part of the injection button 12 is shielded by the interior space of the spline knob 76 in the radial area, so that the two are spatially combined and have a stronger sense of integration.

[0147] Please continue to refer to Figure 19 The outer side of the dose drum 7 is provided with dose markings 77, and the distal end of the pen barrel assembly 100 is provided with a first window 64 for displaying the dose markings 77.

[0148] The dose markings 77 can be a plurality of printed numbers. The dose markings 77 of the dose drum 7 are displayed through the first window 64 at the distal end, which facilitates the operator to identify the current feedback optimized injection pen usage state.

[0149] Please continue to refer to Figure 14 The proximal end of the dose drum 7 is provided with a stop block for abutting the threaded body 63 to limit the maximum axial movement distance generated by the rotation of the dose drum 7.

[0150] As an option, the proximal end of the dose drum 7 is provided with a limit window 78, which can realize the rotation stop function as a stop block. Figure 14 As shown, 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 will abut the limit window 78 at the proximal end of the dose drum 7, which limits the maximum axial displacement of the dose drum 7 in the pen body 6.

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

[0152] When the clutch 11 abuts the dose drum 7, the limit spring arm 72 is extruded by the proximal end of the clutch 11, and the first protrusion 79 is raised and out of contact with the gear step rib 62; when the clutch 11 is disengaged from the dose drum 7, the first protrusion 79 always maintains contact with the gear step rib 62.

[0153] In this embodiment, the limit spring arm 72 is a flexible structure. The limit spring arm 72 can be regarded as a seesaw. The part of the limit spring arm 72 abutting the clutch 11 is located at one end of the seesaw, and the part of the limit spring arm 72 connected with the first protrusion 79 is located at the other end of the seesaw.

[0154] In the dose setting stage, clutch 11 does not move towards the proximal end, dose drum 7 does not interface with clutch 11 through linkage protrusion 112 and linkage spline 74, at this time, limit spring arm 72 is not extruded by clutch 11, first protrusion 79 always maintains contact with gear step rib 62, with the rotation of dose drum 7 in the dose setting stage, first protrusion 79 generates feedback with gear step rib 62.

[0155] In the injection stage, the operator presses injection button 12, at this time, clutch 11 moves towards the proximal end, dose drum 7 interfaces with clutch 11 through linkage protrusion 112 and linkage spline 74, limit spring arm 72 is extruded by clutch 11, limit spring arm 72 is raised and brings first protrusion 79 out of contact with gear step rib 62, therefore, first protrusion 79 does not generate feedback in the injection stage, the feedback in the injection stage is generated by first cantilever 51.

[0156] Therefore, the feedback-optimized injection pen has different components generating feedback in different stages. In the dose setting stage, the component generating feedback is dose drum 7, in the injection stage, the component generating feedback is push rod sleeve 5. The feedback interference of different components in different stages is avoided, making the feedback more accurate and effective.

[0157] In addition, due to the elastic effect of limit spring arm 72, when limit spring arm 72 has not deformed enough due to the proximal movement of clutch 11, there is a gap between linkage spline 74 at the distal end of dose drum 7 and linkage protrusion 112 at the distal end of clutch 11, which is equivalent to limit spring arm 72 supporting clutch 11, so that linkage spline 74 and linkage protrusion 112 are separated, at this time, dose drum 7 moves independently of clutch 11; when limit spring arm 72 deforms enough due to the proximal movement of clutch 11, linkage spline 74 at the distal end of dose drum 7 and linkage protrusion 112 at the distal end of clutch 11 are combined, at this time, dose drum 7 moves together with clutch 11.

[0158] Please refer to Figure 20 and Figure 21 , Figure 20 The structure diagram of limit nut and clutch provided by the embodiments of the present application, Figure 21 The structure diagram of limit nut and dose drum provided by the embodiments of the present application. In some embodiments, the feedback-optimized injection pen further comprises limit nut 10, limit nut 10 is sleeved on clutch 11, limit nut 10 is nested inside dose drum 7.

[0159] Specifically, please refer to Figure 20 and Figure 21The outer side of the limiting screw cap 10 is provided with a guide groove 101, which is used for embedding the guide rib 73 on the inner side of the dose drum 7 to realize the axial movement of the limiting screw cap 10. The inner side of the limiting screw cap 10 is provided with a second internal thread 102, which is used for connecting with the second external thread 113 on the outer side of the clutch 11.

[0160] As shown in Figure 20 and Figure 21 , the guide rib 73 extends axially on the inner side of the dose drum 7. The symmetrical guide rib 73 is connected with the symmetrical guide groove 101 on the outer side of the limiting screw cap 10, which is used for limiting the limiting screw cap 10 to only rotate synchronously with the dose drum 7 and move axially along the guide rib 73. The second internal thread 102 on the inner side of the limiting screw cap 10 is connected with the second external thread 113 of the clutch 11, so as to control the limiting screw cap 10 to always perform specific axial displacement and rotation according to the second external thread 113 of the clutch 11.

[0161] Please refer to Figure 22 , Figure 22 for the structure diagram of the feedback-optimized injection pen and needle provided by the embodiment of the present application.

[0162] In a specific embodiment, the feedback-optimized injection pen provided by the present application is a pen-type injector. The proximal end is the injection end connected with a medicine cartridge such as a cassette bottle 1, and the distal end is the adjustment end for adjusting the injection dose. The first window 64 has a dose mark 77 inside. The distal end is also provided with a spline knob 76. When the spline knob 76 is rotated, it can drive the dose drum 7 to rotate and axially displace. The distal end is also provided with an injection button 12. When the injection button 12 is pressed, it can push the dose drum 7 to move towards the injection end.

[0163] The feedback-optimized injection pen sets the feedback structure at the position of the dose drum 7 relative to the proximal end. The feedback effect is triggered by the dose drum 7 and the gear rib 62 inside the pen body 6. The feedback is more consistent, and there is enough space to adjust, whether it is the volume of the sound or the force of the click. It is easier to achieve and easier because there is enough space to trigger the sound, and the structure is relatively simple. In addition, the feedback-optimized injection pen produces feedback from different components at different stages. In the dose setting stage, the feedback component is the dose drum 7, and in the injection stage, the feedback component is the push rod sleeve 5. Avoiding the feedback interference of different components at different stages makes the feedback more accurate and effective.

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

[0165] Please refer to Figure 23 , Figure 23 The structure diagram of the push rod buckle provided in the embodiments of the present application is shown. 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 clamp plate 91, which is connected with the connecting head 42 at the proximal end of the push rod 4, so as to fix the push rod buckle 9 to the axial position of the proximal end of the push rod 4.

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

[0168] Please refer to Figure 25 , Figure 25 The structure diagram of the cartridge holder provided in the embodiments of the present application is shown. The proximal end of the cartridge holder 8 is provided with a threaded interface 85 for installing a disposable needle. The cartridge holder 8 is hollow inside and open at the distal end, for installing the cartridge 1. The cartridge holder 8 is provided with a second window 84 extending in the axial direction, which facilitates the operator to observe the use of the cartridge 1, such as the position of the rubber plug 2 inside the cartridge 1. The distal end of the cartridge holder 8 is provided with a second positioning hole 81, a positioning shoulder 82 and a relief groove 83. The second positioning hole 81 is connected with the cartridge holder 8, the positioning shoulder 82 is axially positioned with the pen body 6, and the relief groove 83 is located between adjacent second positioning holes 81 in the circumferential direction.

[0169] Please refer to Figure 26 , Figure 26 The structure diagram of the injection button provided in the embodiments of the present application is shown. The proximal end of the injection button 12 is provided with a mounting step 122, and the distal end of the injection button 12 is provided with a button surface 121 for providing a better touch feeling when pressed by the operator.

[0170] Please refer to Figure 27 , Figure 27The feedback-optimized injection pen dose adjustment structure provided by the embodiments of the present application. The feedback-optimized injection pen provided by the present application is a multi-dose adjustable multi-use pre-filled feedback-optimized injection pen, which comprises an injection button 12, a clutch 11, a dose drum 7, a push rod sleeve 5, a limiting screw cap 10, a push rod 4, a push rod buckle 9, a pen body 6, a push rod screw cap 3, and a cartridge holder 8. Rotate the dose drum 7 and press the injection button 12, and the injection can be used.

[0171] The present application is different from the similar products on the market in terms of component structure and part cooperation. Through the cooperation of the pen body 6 and the dose drum 7, the operator's touch and sound when adjusting the dose become more accurate and easy to adjust, eliminating the effects achieved by using multiple parts with springs in other products.

[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 rotate. During injection, the clutch 11 moves axially and rotates with the dose drum 7, while driving the push rod sleeve 5 to drive the push rod 4 to generate rotational kinetic energy, so that the push rod 4 moves axially through the push rod screw cap 3 to discharge the medicament.

[0173] The dose drum 7 also includes a plurality of dose markings 77 corresponding to a plurality of dose units visible in the window 64 provided on the pen body 6. The operator rotates the dose drum 7 until the desired dose is visible in the window 64. Once the desired dose is set, the operator presses the injection button 12 until the set dose is completely injected. When the dose marking 77 on the dose drum 7 is displayed as 0 in the window 64 on the pen body 6, it is confirmed that the injection is completed.

[0174] When the operator rotates the dose drum 7 distally to adjust the maximum dose, the limiting window 78 at the proximal end of the dose drum 7 abuts against the threaded body 63 inside the distal end of the pen body 6, and the nearest edge prevents the dose drum 7 from continuing to move distally. This feature limits the operator from continuing to increase the dose.

[0175] Please refer to Figure 28 , Figure 28The profile of the feedback-optimized dose adjustment of the injection pen is provided for 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 extending gear step 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 thereby limits the synchronous rotation of the clutch 11 and the push rod sleeve 5. When the dose drum 7 is rotated, the outer first protrusion 79 of the proximal limit spring arm 72 intermittently contacts the gear step 62 inside the pen body 6, so as to generate the tactile and audible feedback during the dose adjustment.

[0176] When the operator presses the injection button 12, the relative axial position of the clutch 11 in the dose drum 7 moves proximally, at which time the distal linkage protrusion 112 of the clutch 11 engages with the distal internal linkage spline 74 of the dose drum 7, forcing the clutch 11 to rotate synchronously with the dose drum 7; the proximal internal limit spring arm 72 of the dose drum 7 deforms inwardly, so that the rotation of the dose drum 7 does not cooperate with the pen body 6 to generate sound; since the clutch 11 rotates, the push rod sleeve 5 rotates synchronously, so the push rod 4 rotates with the push rod sleeve 5 and expels the required dose; the proximal first cantilever 51 of the push rod sleeve 5 intermittently contacts the circumferentially distributed and axially extending gear step 62 inside the pen body 6, so as to generate the tactile and audible feedback during the injection dose.

[0177] When the clutch 11 does not rotate synchronously with the dose drum 7 (during dose adjustment), the limit nut 10 threadedly engaged with the clutch 11 moves axially with the dose drum 7, and also axially displaces distally or proximally, the amount of displacement being determined by the pitch on the clutch 11. When the limit nut 10 is turned to the distal end and reaches the end of the thread on the clutch 11, it limits further rotation of the dose drum 7, so that the user cannot rotate distally to increase the dose adjustment. When injecting, since the clutch 11 rotates synchronously with the dose drum 7, the limit nut 10 remains at the axial position on the clutch 11 before injection.

[0178] Please refer to Figure 29 , Figure 29 The structure diagram of the push rod nut and the push rod sleeve is provided for 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, at which time 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 dose 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 a resilient cantilever 37. The one-way toothed disc 55 contacts the resilient cantilever 37, limiting the one-way rotation of the push rod sleeve 5 and generating sound feedback when rotating.

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

[0181] It should be noted that the push rod sleeve 5 can have both the first suspension arm 51 and the one-way toothed disc 55, or only have either one of them, which should belong to the scope of the present application.

[0182] Optionally, the number of elastic suspension arms 37 is one pair, and the pair of elastic suspension arms 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 the pen body, the push rod nut, and the cartridge holder provided by another embodiment of the present application, Figure 31 is a structural diagram of the cartridge holder provided by another embodiment of the present application, Figure 32 is a structural diagram of the pen body provided by 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 cartridge holder 8 is changed, the second protrusion 34 and the second positioning hole 81 can be omitted, the fixing of the push rod nut 3 and the cartridge holder 8 is cancelled, a third protrusion 86 is arranged at the distal end of the cartridge holder 8, a third positioning hole 65 is arranged at the proximal end of the pen body 6, and the cartridge holder 8 is directly fixed on the pen body 6 through the cooperation of the third protrusion 86 and the third positioning hole 65.

[0185] Optionally, four symmetric third positioning holes 65 are arranged on the pen body 6, and the fixation of the cartridge holder 8 in the pen body 6 is realized through the cooperation of the four symmetric third protrusions 86.

[0186] It should be noted that many components mentioned in the present application are general standard components or components known to those skilled in the art, and their structures and principles can be known by the skilled person through technical manuals or through conventional experimental methods.

[0187] It should be noted that in the present specification, relational terms such as first and second are used only to distinguish one entity from another, and do not necessarily require or imply that there is any such actual relationship or order between the entities.

[0188] The feedback optimization type injection pen provided by the present application is described in detail above. The principles and implementation modes of the present application are described by applying specific examples in this paper, and the above description of the examples is only used to help understand the method of the present application and its core idea. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A feedback-optimized injection pen, characterized in that The application relates to a pen tube assembly for mounting a cartridge, wherein an inner wall of the pen tube assembly is provided with a plurality of gear level positions which are uniformly distributed along a circumferential direction of the pen tube assembly, and each of the gear level positions extends along an axial direction of the pen tube assembly; an adjusting and pressing assembly is arranged in the pen tube assembly, and an outer periphery of the adjusting and pressing assembly is provided with a protruding structure which is arranged towards the inner wall of the pen tube assembly, and the protruding structure is used for contacting the gear level positions to generate feedback corresponding to a rotation angle when the adjusting and pressing assembly is rotated relative to the pen tube assembly; and a push rod assembly is arranged in the pen tube assembly, and the push rod assembly is used for pushing liquid medicine in the cartridge under the rotation of the adjusting and pressing assembly. The pen tube assembly comprises a pen body, and the inner wall of the pen body is provided with the gear level positions. The adjusting and pressing assembly comprises a push rod sleeve which is rotatably arranged in the pen tube assembly, the push rod sleeve is used for allowing the push rod assembly to pass through and driving the push rod assembly to rotate, and the protruding structure comprises a first cantilever which is arranged at a proximal end of the push rod sleeve. The pen tube assembly further comprises a pen core holder which is fixedly arranged at a proximal end of the pen body, an inner portion of the pen core holder is used for mounting the cartridge, and a push rod nut is fixedly arranged at the proximal end of the pen body and located at a distal end of the pen core holder, the push rod nut is used for allowing the push rod assembly to pass through. The distal end of the push rod nut is provided with a first protruding block which is used for clamping into a first positioning hole of the proximal end of the pen body; and / or the push rod nut is provided with a first internal thread which is used for being connected with the push rod assembly; and / or the proximal end of the push rod nut is provided with a second protruding block which is used for clamping into a second positioning hole of the distal end of the pen core holder; and / or the distal end of the pen core holder is provided with a third protruding block which is used for clamping into a third positioning hole of the proximal end of the pen body; and / or the proximal end of the push rod nut is provided with a positioning elastic sheet which is used for positioning an axial position of the cartridge and providing buffering for the cartridge. The adjusting and pressing assembly further comprises a clutch which is rotatably arranged in the pen tube assembly and can be axially moved, the clutch is used for driving the push rod sleeve to rotate; and a dose drum which is rotatably arranged in the pen tube assembly and can be axially moved, an inner portion of the dose drum is provided with the clutch, the dose drum is used for contacting the clutch and realizing synchronous movement when the clutch moves towards the proximal end, and the protruding structure comprises a first protrusion which is arranged at a proximal end of the dose drum; and an injection button which is rotatably arranged at the clutch and located at an outer portion of the pen tube assembly.

2. The feedback-optimized injection pen of claim 1, wherein The proximal end of the push rod sleeve is provided with a tapered flange, the pen tube assembly comprises a push rod nut which is provided with a tapered cavity and a pair of first clamping arms at a distal end, a tapered surface of the proximal end of the tapered flange is embedded into the tapered cavity, and a main body of the distal end of the tapered flange is clamped by the pair of first clamping arms; and / or ​ ​ 3. The feedback-optimized injection pen of claim 2, wherein, ​ ​ ​ ​ ​ 4. The feedback-optimized injection pen of claim 1, wherein, ​ ​ ​ ​ 5. The feedback-optimized injection pen of claim 4, wherein, ​ The inner part of the push rod sleeve is provided with a limiting block, the push rod assembly comprises a push rod provided with a motion section surface, the push rod is arranged in the inner part of the push rod sleeve, and the motion section surface cooperates with the limiting block to realize axial movement of the push rod and rotation of the push rod under the driving of the push rod sleeve; and / or, The distal end of the push rod sleeve is provided with a notch flange, the notch flange is used for embedding the linkage rib inside the clutch to realize axial movement of the clutch and rotation of the push rod sleeve under the driving of the clutch.

6. The feedback-optimized injection pen of claim 4, wherein, The distal end of the clutch is provided with a positioning flange, the proximal end of the dose drum is provided with a limiting elastic arm, the distal end of the dose 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 elastic arm, so as to limit the clutch inside the dose drum, and the clutch is located at a relatively distally deviated position in the dose drum; The distal end of the clutch is further provided with a linkage protrusion, the distal end of the dose drum is provided with a linkage spline, the linkage spline is used for abutting against the linkage protrusion and realizing synchronous movement when the clutch moves towards the proximal end; and / or, The distal end of the clutch is provided with a mounting barb, the mounting barb is used for clamping the mounting step of the proximal end of the injection button.

7. The feedback optimized injection pen of claim 4, wherein, The outer side of the dose drum is provided with a first external thread used for connecting with a 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, The outer side of the dose drum is provided with a dose mark, the distal end of the pen tube assembly is provided with a first window, and the first window is used for displaying the dose mark; and / or, The proximal end of the dose drum is provided with a cut-off stopper, the cut-off stopper is used for abutting 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 of claim 4, wherein, The proximal end of the dose drum is provided with a limiting elastic arm used for abutting against the proximal end of the clutch, and the first protrusion is arranged outside the limiting elastic arm; When the clutch abuts against the dose drum, the limiting elastic arm is extruded by the proximal end of the clutch, the first protrusion is lifted up and is out of contact with the gear level rib position, and when the clutch is disengaged from the dose drum, the first protrusion always maintains contact with the gear level rib position.

9. The feedback optimized injection pen of claim 4, wherein, The feedback-optimized injection pen further comprises a limiting nut, the limiting nut is sleeved on the clutch, and the limiting nut is nested inside the dose drum.

10. Feedback-optimised injection pen according to claim 9, characterized in that The outer side of the limiting nut is provided with a guide groove, the guide groove is used for embedding a guide rib inside the dose drum to realize axial movement of the limiting nut, and the inner side of the limiting nut is provided with a second internal thread, the second internal thread is used for connecting with a second external thread outside the clutch.

11. The feedback optimized injection pen of claim 1, wherein, The adjusting and pressing assembly comprises: A push rod sleeve is rotatably arranged in the inner part of the pen tube assembly, the push rod sleeve is used for arranging the push rod assembly and driving the push rod assembly to rotate, and the protrusion structure comprises a one-way gear disc arranged at the proximal end of the push rod sleeve; a clutch rotatably disposed inside the pen tube assembly and axially movable, the clutch for driving the push rod sleeve to rotate; a dose drum rotatably disposed inside the pen tube assembly and axially movable, the inside of the dose drum being provided with the clutch, the dose drum for engaging and moving synchronously with the clutch when the clutch moves towards the proximal end, the protruding structure including a first protrusion provided at the proximal end of the dose drum; an injection button rotatably disposed on the clutch and located outside the pen tube assembly; the pen tube assembly including a push rod nut provided with a resilient cantilever, the resilient cantilever being in contact with the one-way tooth disc to limit the one-way rotation of the push rod sleeve and to feedback sound when rotating.

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