Insulin injection pen

Abstract

The invention discloses an insulin injection pen, and belongs to the technical field of medical instruments. Comprising a main body shell, a connecting sleeve and a medicine bin, and the main body shell is connected with the medicine bin through the connecting sleeve; the adjusting mechanism comprises a dosage rotating cylinder and a transmission pipe, the dosage rotating cylinder is arranged in the main body shell and is in threaded connection with the main body shell, and the transmission pipe is arranged in the dosage rotating cylinder and is in clutch connection with the dosage rotating cylinder; the driving mechanism is arranged in the transmission pipe, and the driving mechanism is matched with the connecting sleeve to form an injection sound production structure; the insulin injection pen is switched from a dose adjusting state to an injection state through up-down separation and reunion of the transmission tube, and the insulin injection pen is injected and dosed through the driving mechanism. The connecting sleeve is made of a plastic part with high hardness, even if the medicament bottle gives reactive force to the driving mechanism during injection, the matching precision between the driving mechanism and the connecting sleeve is not affected, the reliability of the injection sound production structure is improved, and the problem of deformation or failure possibly occurring after the reactive force during long-term injection administration is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an insulin injection pen. Background Art

[0002] In recent years, with the continuous increase in the incidence of diabetes, the demand for convenient, safe and efficient drug delivery devices has also increased. As an indispensable part of diabetes treatment, insulin injection pens have been widely used.

[0003] However, the existing insulin injection pens have unreasonable structural designs, require a large number of parts and components, and have complex structures, which make assembly inconvenient. In addition, the reliability of the overall structure after assembly is insufficient, and the assembly accuracy of some parts is low, which ultimately leads to mechanical failures or unstable performance of the product during use, affecting the user experience. Summary of the invention

[0004] The present invention aims at the above problems existing in the prior art and proposes an insulin injection pen which has a simple structure, is easy to assemble and has high reliability after assembly.

[0005] The present invention can be achieved through the following technical solutions:

[0006] An insulin injection pen, comprising:

[0007] A main body shell, a connecting sleeve and a medicine bin, wherein the main body shell and the medicine bin are connected via the connecting sleeve, and the medicine bin is used to install medicine bottles;

[0008] The adjustment mechanism comprises a dose drum and a transmission tube, wherein the dose drum is arranged in the main body shell and the two are threadedly connected, and the transmission tube is arranged in the dose drum and the two are clutch-connected;

[0009] A driving mechanism, which is arranged in the transmission tube, and is used to push the plug in the medicine bottle to move forward and administer the medicine, and the driving mechanism cooperates with the connecting sleeve to form an injection sounding structure;

[0010] The insulin injection pen is switched from a dosage adjustment state to an injection state through the upper and lower clutches of the transmission tube, and the drug is injected through the driving mechanism.

[0011] As a further improvement of the present invention, the transmission tube has a clutch surface for clutching and connecting with the dose drum, the clutch surface has downwardly protruding dose drum engagement teeth, and the dose drum has upwardly protruding transmission tube matching teeth, wherein,

[0012] During the dose adjustment process, the engagement teeth of the dose drum are separated from the mating teeth of the transmission tube, and at this time, as the dose drum rotates, the transmission tube jumps up and down;

[0013] During the injection action, the transmission tube is directly pressed down by the injection button to make the engagement teeth of the dose drum mesh with the matching teeth of the transmission tube, and at this time, the transmission tube and the dose drum rotate synchronously.

[0014] As a further improvement of the present invention, the driving mechanism includes a driving tube, which is arranged in the transmission tube. The inner wall of the transmission tube is provided with guide ribs along its axial direction, and the outer wall of the driving tube is provided with a guide groove, and the guide rib is embedded in the guide groove.

[0015] As a further improvement of the present invention, the driving mechanism further comprises a screw rod, which is arranged in the driving tube, and the cross-section of the inner wall of the driving tube and the cross-section of the screw rod are both arranged in a waist-drum-shaped structure and the two are cooperatively connected.

[0016] As a further improvement of the present invention, an integrally connected threaded seat is provided in the connecting sleeve, the screw passes through the threaded seat and the two are threadedly connected, and one end of the screw close to the medicine chamber passes through the threaded seat and is connected to a piston push piece.

[0017] As a further improvement of the present invention, the inner wall of the connecting sleeve is further provided with at least one pair of arc-shaped baffles, a distance is left between the arc-shaped baffles and the threaded seat to form a rotation space, the arc-shaped baffles have a limiting protrusion, and the end of the driving tube is provided with a ring-shaped limiting rib, the limiting rib is located in the rotation space between the arc-shaped baffle and the threaded seat, and the limiting protrusion is buckled with the limiting rib up and down.

[0018] As a further improvement of the present invention, it also includes an adjustment sounding ring, which is located in the accommodating space between the top of the dosage drum and the transmission tube and is sleeved on the transmission tube. The adjustment sounding ring cooperates with the dosage drum to form a positive adjustment sounding structure, and the adjustment sounding ring cooperates with the transmission tube to form a reverse adjustment sounding structure.

[0019] As a further improvement of the present invention, the inner wall of the dosage drum is provided with a first thorn arranged along a unidirectional deflection, and the outer wall of the adjustment sound ring is provided with a first elastic tooth protruding outward, and the first elastic tooth is engaged with the first thorn to form the positive adjustment sound structure.

[0020] As a further improvement of the present invention, the outer wall of the transmission tube is provided with a second spine, the second spine is unidirectionally deflected in the opposite direction to the first spine, and the inner wall of the adjustment sounding ring is provided with a second elastic tooth protruding inwardly, the second elastic tooth is interlocked with the second spine to form the reverse adjustment sounding structure.

[0021] As a further improvement of the present invention, the inner wall of the connecting sleeve is provided with a third spine, and the driving tube is provided with a third elastic tooth protruding outward, and the third spine cooperates with the third elastic tooth to form an injection sound-generating structure.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The main shell, connecting sleeve and medicine chamber are each injection molded, which is convenient for production. The connecting sleeve is connected to the main shell and medicine chamber by buckle connection, which improves the stability and reliability of the overall structure and ensures the accuracy of product use.

[0024] 2. The connecting sleeve is made of plastic with high hardness. Even if the medicine bottle gives a reaction force to the driving mechanism during injection, it will not affect the matching accuracy between the driving mechanism and the connecting sleeve, thereby improving the reliability of the injection sound structure, avoiding deformation or failure problems that may occur after long-term reaction force during injection, and extending the service life of the product;

[0025] 3. The connecting sleeve is made of a plastic part with high hardness. The injection sound structure composed of the third spine and the third elastic tooth of the driving tube can provide clearer and more specific sound feedback, helping users to confirm the injection process, and also reducing the risk of sound attenuation due to long-term use.

[0026] 4. The injection button and the transmission tube are directly in contact and pressed down, and no transition piece is required between the two. The adjusting sound ring will not be deformed or the matching accuracy will be reduced due to the pressure generated when the injection button is pressed, thereby ensuring that the adjusting sound ring will not accidentally fall out during the up and down jumping of the transmission tube, thereby enhancing the reliability of the adjusting sound structure;

[0027] 5. The threaded seat, arc-shaped baffle and limiting convex part that match the driving tube and the screw are all integrated on the connecting sleeve, without adding additional parts, which further improves the convenience of product assembly and reliability during use;

[0028] 6. Only one part, the sound ring, needs to be adjusted to solve the sound problem when the dosage drum rotates forward and reverse, which optimizes the overall structure, reduces the number of parts, and makes the overall structure more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of the insulin injection pen of the present invention;

[0030] Figure 2 The present invention Figure 1 A partial enlarged view of the middle A;

[0031] Figure 3 The insulin injection pen of the present invention is distinguished from Figure 1 Cross-sectional view of perspective;

[0032] Figure 4 The present invention Figure 3 A partial enlarged view of point B in the middle;

[0033] Figure 5 It is a structural schematic diagram of the positive adjustment sound-generating structure of the present invention;

[0034] Figure 6 It is a structural schematic diagram of the reverse adjustment sound-generating structure of the present invention;

[0035] Figure 7 It is a structural schematic diagram of the injection sound-generating structure of the present invention;

[0036] Figure 8 is a schematic diagram of the structure of the dosage drum of the present invention;

[0037] Fig. 9 It is a structural schematic diagram of the transmission tube of the present invention;

[0038] Fig.10 It is a schematic diagram of the structure of the adjustable sound-generating ring of the present invention;

[0039] Fig.11 is a schematic structural diagram of a driving tube of the present invention;

[0040] Fig.12 It is a structural schematic diagram of the screw of the present invention;

[0041] Fig.13 It is a structural schematic diagram of the connecting sleeve of the present invention;

[0042] Fig.14 It is a schematic diagram of the structure of the medicine warehouse of the present invention;

[0043] Fig.15 It is a schematic structural diagram of the insulin injection pen of the present invention.

[0044] In the figure, 100, main body shell;

[0045] 200, connecting sleeve; 210, threaded seat; 220, arc-shaped baffle; 221, limiting convex part; 230, third thorn;

[0046] 300, medicine chamber; 310, pen cap;

[0047] 400, adjustment mechanism; 410, dose drum; 411, transmission tube matching teeth; 412, first thorns; 420, transmission tube; 421, dose drum meshing teeth; 422, second thorns; 423, guide ribs; 430, adjustment sound ring; 431, first elastic teeth; 432, second elastic teeth;

[0048] 500, driving mechanism; 510, driving tube; 511, guide groove; 512, limiting rib; 513, third elastic tooth; 520, screw rod; 521, piston push piece; 530, memory ring;

[0049] 600. Injection button. DETAILED DESCRIPTION

[0050] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.

[0051] like Figure 1-Figure 15 As shown, the present invention provides an insulin injection pen, comprising:

[0052] The main body shell 100, the connecting sleeve 200 and the medicine chamber 300 are connected by the connecting sleeve 200, and the medicine chamber 300 is used to install the medicine bottle;

[0053] The adjustment mechanism 400 includes a dose drum 410 and a transmission tube 420. The dose drum 410 is disposed in the main housing 100 and the two are threadedly connected. The transmission tube 420 is disposed in the dose drum 410 and the two are clutch-connected.

[0054] The driving mechanism 500 is arranged in the transmission tube 420 and cooperates with the connecting sleeve 200. The driving mechanism 500 is used to push the inner plug of the medicine bottle forward to administer the medicine, and the driving mechanism 500 cooperates with the connecting sleeve 200 to form an injection sound structure, that is, during the process of the driving mechanism 500 performing injection administration, the injection sound structure will continuously emit a sound for prompting;

[0055] Specifically, the insulin injection pen has a dosage adjustment state and an injection state. The upper and lower clutches of the transmission tube 420 are used to switch the insulin injection pen between the dosage adjustment state and the injection state. When switched to the injection state, the driving mechanism 500 can be used for injection and drug administration.

[0056] It should be noted that the main shell 100, the connecting sleeve 200 and the medicine chamber 300 are each injection molded. When the driving mechanism 500 pushes the plug in the medicine bottle forward to administer the drug, the medicine bottle will give a reaction force to the driving mechanism 500. At this time, the injection structure will also be stressed. The injection-molded plastic parts will have a problem of poor reliability under long-term stress.

[0057] In response to the above problem, in this embodiment, the connecting sleeve 200 is made of a plastic part with higher hardness. Even if the medicine bottle gives a reaction force to the driving mechanism 500 during injection, it will not affect the matching accuracy between the driving mechanism 500 and the connecting sleeve 200, thereby improving the structural reliability of the insulin injection pen at this position.

[0058] In addition, the connecting sleeve 200 is interlocked with the main shell 100 and the medicine chamber 300, which can further improve the connection stability between the main shell 100 and the medicine chamber 300. And because the sound of plastic parts is related to the hardness of the material, the use of this connecting sleeve 200 with higher hardness and the injection sound structure formed between it and the driving mechanism 500 can provide clearer sound.

[0059] Preferably, the transmission tube 420 has a clutch surface for clutching with the dose drum 410, the clutch surface has a dose drum meshing tooth 421 protruding downward, and the dose drum 410 has a transmission tube matching tooth 411 protruding upward, wherein,

[0060] During the dose adjustment process, the dose drum meshing teeth 421 are separated from the transmission tube matching teeth 411. At this time, as the dose drum 410 rotates, the transmission tube 420 jumps up and down. Since the transmission tube 420 is mounted on the dose drum 410, as the dose drum 410 moves up and down along the thread of the main housing 100, the transmission tube 420 is driven to move up and down synchronously.

[0061] During the injection action, the transmission tube 420 is directly pressed down by the injection button 600 to make the dose drum meshing teeth 421 mesh with the transmission tube matching teeth 411 , and at this time, the transmission tube 420 and the dose drum 410 rotate synchronously.

[0062] In order to provide better feedback when adjusting the dosage, an adjustment sound ring 430 is also provided, which is located in the accommodating space between the top of the dosage drum 410 and the transmission tube 420 and is sleeved on the transmission tube 420. The adjustment sound ring 430 and the dosage drum 410 cooperate to form a positive adjustment sound structure, and the adjustment sound ring 430 and the transmission tube 420 cooperate to form a reverse adjustment sound structure.

[0063] Specifically, the inner wall of the dosage drum 410 is provided with a first thorn 412 which is unidirectionally inclined, and the outer wall of the adjustment sound ring 430 is provided with a first elastic tooth 431 protruding outward, and the first elastic tooth 431 is engaged with the first thorn 412 to form a positive adjustment sound structure.

[0064] Preferably, the outer wall of the transmission tube 420 is provided with a second thorn 422, and the second thorn 422 and the first thorn 412 are unidirectionally deflected in opposite directions. The inner wall of the adjustment sound ring 430 is provided with a second elastic tooth 432 protruding inward, and the second elastic tooth 432 is buckled with the second thorn 422 to form a reverse adjustment sound structure.

[0065] That is, the outer wall and the inner wall of the sound adjusting ring 430 are respectively integrated with the first elastic teeth 431 and the second elastic teeth 432, and in the process of adjusting the dosage, since the clutch surface of the transmission tube 420 and the dosage drum 410 are in a relatively separated state, as the dosage drum 410 rotates, the transmission tube 420 will only jump up and down but will not rotate accordingly;

[0066] Specifically, during the forward rotation of the dosage drum 410, the transmission tube 420 does not rotate, and when the surface where the first thorn 412 is located rotates, the second thorn 422 limits the second elastic tooth 432, restricting the rotation of the sound-generating ring 430, so that the first thorn 412 and the first elastic tooth 431 can contact and generate sound;

[0067] On the contrary, when the dose drum 410 rotates in the opposite direction, the first thorn 412 limits the first elastic tooth 431. At this time, the dose drum 410 drives the adjusting sound ring 430 to rotate, and the transmission tube 420 does not rotate, so that the second thorn 422 and the second elastic tooth 432 can contact and make a sound.

[0068] Therefore, only one part, the sound ring 430, needs to be adjusted to solve the sound generation problem when the dosage drum 410 rotates forward and reverse, thereby optimizing the overall structure, reducing the number of parts, and making the overall structure more reliable.

[0069] Preferably, the driving mechanism 500 includes a driving tube 510, which is disposed in the transmission tube 420. The inner wall of the transmission tube 420 is provided with guide ribs 423 along its axial direction, and the outer wall of the driving tube 510 is provided with guide grooves 511, and the guide ribs 423 are embedded in the guide grooves 511.

[0070] That is to say, through the cooperation between the guide rib 423 and the guide groove 511, the transmission tube 420 and the driving tube 510 can only rotate synchronously, but the transmission tube 420 can move up and down in a straight line direction along the guide rib 423, that is, during the dose adjustment process, the transmission tube 420 moves up and down along the direction of the guide rib 423.

[0071] Furthermore, the driving mechanism 500 also includes a screw 520, which is arranged in the driving tube 510. The cross-section of the inner wall of the driving tube 510 and the cross-section of the screw 520 are both waist-drum-shaped structures and the two are connected in a coordinated manner. Through the coordination of the waist-drum-shaped structures of the two, the screw 520 and the driving tube 510 can only rotate synchronously, that is, the transmission tube 420, the driving tube 510, and the screw 520 form a synchronously rotating linkage structure.

[0072] Preferably, an integrally connected threaded seat 210 is provided in the connecting sleeve 200 , the screw 520 passes through the threaded seat 210 and the two are threadedly connected, and one end of the screw 520 close to the medicine chamber 300 passes through the threaded seat 210 and is connected to a piston push piece 521 .

[0073] Preferably, an injection button 600 is further included, which is buckled with an end of the dosage drum 410 away from the medicine chamber 300, and the transmission tube 420 is pressed downward by pressing the injection button 600.

[0074] Specifically, when performing an injection action, the transmission tube 420 is directly pressed down through the injection button 600, so that the clutch surface of the transmission tube 420 engages with the dosage drum 410. At this time, the dosage drum 410 is subjected to the downward pressure and rotates and moves downward along the thread of the main shell 100, thereby driving the transmission tube 420 to rotate and move downward synchronously. Since the transmission tube 420, the drive tube 510, and the screw 520 can only rotate synchronously, the screw 520 can extend downward along the threaded seat 210 and push the piston push piece 521 forward to achieve the purpose of injection and drug administration.

[0075] It is worth mentioning here that the injection button 600 is in direct contact with the transmission tube 420 and is pressed down, and no transition piece is required between the two. In addition, the adjustment sounding ring 430 will not be deformed or have reduced fitting accuracy due to the pressure generated when the injection button 600 is pressed, thereby ensuring that the adjustment sounding ring 430 will not accidentally fall out during the up and down jumping of the transmission tube 420, thereby enhancing the reliability of the adjustment sounding structure.

[0076] Preferably, the inner wall of the connecting sleeve 200 is further provided with at least one pair of arc-shaped baffles 220, and a distance is left between the arc-shaped baffles 220 and the threaded seat 210 to form a rotation space, wherein:

[0077] The arc-shaped baffle 220 has a limiting convex portion 221, and the end of the driving tube 510 is provided with a ring-shaped limiting rib 512, and the limiting rib 512 is located in the rotation space between the arc-shaped baffle 220 and the threaded seat 210. The limiting rib 221 is buckled with the limiting rib 512 up and down, that is, the setting of the limiting rib 221 limits the axial direction of the driving tube 510, ensuring that during the injection process, the driving tube 510 always keeps rotating in place, and the screw 520 gradually extends forward and pushes the plug in the medicine bottle through the piston push piece 521.

[0078] In addition, it should be noted that the threaded seat 210, the arc-shaped baffle plate 220, and the limiting protrusion 221 are all integrated into the connecting sleeve 200, which can meet the purpose of linkage with the driving tube 510 and the screw 520 without adding additional parts, thereby further improving the convenience of product assembly and reliability during use.

[0079] Preferably, the inner wall of the connecting sleeve 200 is provided with a third thorn 230, and the driving tube 510 is provided with a third elastic tooth 513 protruding outward, and the third thorn 230 cooperates with the third elastic tooth 513 to form an injection sound structure;

[0080] Specifically, during the injection process, as the driving tube 510 rotates in situ, the third elastic teeth 513 can be driven to move along the third spines 230 to achieve the purpose of injection sound.

[0081] And because the third elastic tooth 513 is integrated on the outer wall of the driving tube 510, it is possible to clearly see whether the third elastic tooth 513 and the third thorn 230 are properly matched during assembly, and there will be no problem of the third elastic tooth 513 being damaged due to obstructed vision during assembly.

[0082] Preferably, a memory ring 530 is further included, which is sleeved on the transmission tube 510 and the two are threadedly connected. When the injection action is performed, as the transmission tube 510 rotates in situ, the memory ring 530 moves upward along the transmission tube 510 and memorizes the single dosage, wherein the up and down strokes of the memory ring 530 are jointly determined by the stop position on the transmission tube 420 and the stop position of the inner hole of the dose drum 410.

[0083] In addition, a pen cap 310 is provided on the medicine chamber 300 , and the pen cap 310 is buckled with the connecting sleeve 200 .

[0084] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical schemes composed of any combination of the above technical features. The above is a specific implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

[0085] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0086] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0087] The technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0088] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An insulin injection pen, characterized in that: include: A main body shell, a connecting sleeve and a medicine bin, wherein the main body shell and the medicine bin are connected via the connecting sleeve, and the medicine bin is used to install medicine bottles; The adjustment mechanism comprises a dose drum and a transmission tube, wherein the dose drum is arranged in the main body shell and the two are threadedly connected, and the transmission tube is arranged in the dose drum and the two are clutch-connected; A driving mechanism, which is arranged in the transmission tube, and is used to push the plug in the medicine bottle to move forward and administer the medicine, and the driving mechanism cooperates with the connecting sleeve to form an injection sounding structure; The insulin injection pen is switched from a dosage adjustment state to an injection state through the upper and lower clutches of the transmission tube, and the drug is injected through the driving mechanism.

2. An insulin injection pen according to claim 1, characterized in that: The transmission tube has a clutch surface for clutching with the dose drum, the clutch surface has downwardly protruding dose drum engagement teeth, and the dose drum has upwardly protruding transmission tube matching teeth, wherein: During the dose adjustment process, the engagement teeth of the dose drum are separated from the mating teeth of the transmission tube, and at this time, as the dose drum rotates, the transmission tube jumps up and down; During the injection action, the transmission tube is directly pressed down by the injection button to make the engagement teeth of the dose drum mesh with the matching teeth of the transmission tube, and at this time, the transmission tube and the dose drum rotate synchronously.

3. An insulin injection pen according to claim 1, characterized in that: The driving mechanism comprises a driving tube, which is arranged in the transmission tube. The inner wall of the transmission tube is provided with guide ribs along its axial direction, and the outer wall of the driving tube is provided with guide grooves, and the guide ribs are embedded in the guide grooves.

4. An insulin injection pen according to claim 3, characterized in that: The driving mechanism also includes a screw rod, which is arranged in the driving tube. The cross-section of the inner wall of the driving tube and the cross-section of the screw rod are both arranged in a waist drum-shaped structure and the two are matched and connected.

5. An insulin injection pen according to claim 4, characterized in that: An integrally connected threaded seat is provided in the connecting sleeve, the screw rod passes through the threaded seat and the two are threadedly connected, and one end of the screw rod close to the medicine bin passes through the threaded seat and is connected to a piston push piece.

6. An insulin injection pen according to claim 5, characterized in that: The inner wall of the connecting sleeve is also provided with at least one pair of arc-shaped baffles, a distance is left between the arc-shaped baffles and the threaded seat to form a rotation space, the arc-shaped baffles have a limiting convex portion, and the end of the driving tube is provided with a ring-shaped limiting rib, the limiting rib is located in the rotation space between the arc-shaped baffles and the threaded seat, and the limiting rib is buckled with the limiting rib up and down.

7. An insulin injection pen according to claim 1, characterized in that: It also includes an adjustment sounding ring, which is located in the accommodating space between the top of the dosage drum and the transmission tube and is sleeved on the transmission tube. The adjustment sounding ring cooperates with the dosage drum to form a positive adjustment sounding structure, and the adjustment sounding ring cooperates with the transmission tube to form a reverse adjustment sounding structure.

8. An insulin injection pen according to claim 7, characterized in that: The inner wall of the dosage drum is provided with a first thorn arranged in a unidirectional deflection, and the outer wall of the adjustment sound ring is provided with a first elastic tooth protruding outward, and the first elastic tooth is engaged with the first thorn to form the positive adjustment sound structure.

9. An insulin injection pen according to claim 8, characterized in that: The outer wall of the transmission tube is provided with a second spine, which is unidirectionally deflected in the opposite direction to the first spine. The inner wall of the adjustment sounding ring is provided with a second elastic tooth protruding inwardly, which is buckled with the second spine to form the reverse adjustment sounding structure.

10. An insulin injection pen according to claim 3, characterized in that: The inner wall of the connecting sleeve is provided with a third thorn, and the driving tube is provided with a third elastic tooth protruding outward, and the third thorn cooperates with the third elastic tooth to form the injection sound-generating structure.

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