Pen type injection device with drive

Abstract

The invention relates to the technical field of pen type injection devices, in particular to a pen type injection device with a drive, which comprises a medicine bottle support, a shell, a dose setting ring, a trigger mechanism and an autonomous drive injection assembly, and a medicine bottle is accommodated in the medicine bottle support; the shell is connected with the medicine bottle bracket; the dose setting ring is rotationally connected with the shell; the dose setting ring is configured to set a dose by forward rotation of the dose setting ring relative to the housing, the dose being corrected by reverse rotation of the dose setting ring relative to the housing; the autonomously-driven injection assembly comprises a driving assembly and an injection assembly, and when the dosage is set, the driving assembly stores driving force; when the dose is corrected, the driving assembly releases the driving force; when the triggering mechanism is triggered, the driving assembly can drive the injection assembly to move towards the medicine bottle, and injection is achieved. The device has the functions of dose setting, dose correction, automatic pushing of liquid medicine by triggering and driving of an injection button, locking after the liquid medicine in the device is completely injected and emptied, and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pen injection devices, in particular to a pen injection device with driving, more particularly, the present application relates to a multiple-use mechanical injection pen with built-in torsion spring driving, which is driven by setting dose, dose correction, injection button triggering and self-propelled injection of liquid medicine, and is discarded after the liquid medicine in the device is completely injected and emptied. BACKGROUND

[0002] There are currently one-time mechanical injection pens on the market, which are mainly used for single-dose (small-dose) and certain time interval (such as one week) injection of liquid medicine. There are also multiple-use mechanical injection pens, which are mainly used for multiple-dose and high-frequency (such as daily) injection of liquid medicine. Compared with one-time injection pens, multiple-use mechanical injection pens have lower use cost, flexible single-injection dose adjustment, and can be discarded after completing a cycle or a certain number of times, so multiple-use mechanical injection pens are more suitable for use.

[0003] There are currently different types of products on the market. In general, the dose setting ring of a multiple-use mechanical injection pen will rotate and extend out of the pen when setting the dose, and active injection is required after setting. There is no self-driven injection structure. In addition, some injection pens with self-driven injection structure can keep the setting ring in place when setting the dose, but often do not have dose correction function, which brings the problem that the dose cannot be corrected when the user sets the dose incorrectly, resulting in inaccurate dose injection.

[0004] In addition, the existing mechanical injection pen can still perform dose setting, dose correction or injection operation after injection is completed, and the reliability and safety of the device are low.

[0005] Therefore, the present application provides a pen injection device with driving. SUMMARY

[0006] In order to solve at least one of the above technical problems in the prior art, the present application provides a pen injection device with driving.

[0007] To achieve the above purpose, the technical scheme of the present application is as follows:

[0008] The present application provides a pen injection device with driving, comprising:

[0009] A medicine bottle support is arranged in the housing and is used for accommodating a medicine bottle.

[0010] A housing is connected with the medicine bottle support.

[0011] characterized in that: a dose setting ring, the dose setting ring is rotatably connected with the shell; the dose setting ring is configured to set a dose by forward rotation of the dose setting ring relative to the shell, and correct a dose by reverse rotation of the dose setting ring relative to the shell;

[0012] a trigger mechanism, the trigger mechanism is arranged at one end of the shell;

[0013] an autonomous drive injection assembly, the autonomous drive injection assembly comprises a drive assembly and an injection assembly, the drive assembly stores driving force during dose setting, and releases the driving force during dose correction;

[0014] when the trigger mechanism is triggered, the drive assembly can drive the injection assembly to move towards the medicine bottle, thereby achieving injection.

[0015] Further, it further comprises a post-injection locking and residual volume monitoring assembly, which is a termination ring arranged between the drive rod and the push rod;

[0016] The post-injection locking and residual volume monitoring assembly is configured to lock the injection assembly after all the liquid medicine is injected, so that injection cannot be performed;

[0017] And when the last dose is set, if the set dose is greater than the remaining dose, the post-injection locking and residual volume monitoring assembly can lock the injection assembly, so that only the remaining dose can be set.

[0018] Further, a dose setting ratchet is arranged inside the dose setting ring, a drive arm is arranged on the inner wall of the dose setting ring, a drive protrusion is arranged on the outer wall of the dose setting ratchet, and the front end of the drive arm abuts against the side wall of the drive protrusion. During dose setting, the drive arm pushes the drive protrusion to rotate;

[0019] A plurality of curved arms are arranged on the outer wall of the dose setting ratchet, bidirectional ratchet teeth are arranged on the curved arms, bidirectional ratchet engaging tooth grooves are arranged on the inner wall of one end of the shell, and the bidirectional ratchet engaging tooth grooves and the bidirectional ratchet teeth are engaged.

[0020] Further, two drive protrusions and two curved arms are arranged on the outer wall of the dose setting ratchet, and the two drive protrusions and the two curved arms are arranged alternately.

[0021] Further, bidirectional ratchet engaging tooth grooves are arranged on the inner wall of one end of the shell, and a plurality of curved arms are arranged on the dose setting ring, the curved arms extending in the reverse direction of the dose setting rotation direction;

[0022] Bidirectional ratchet teeth are arranged on the curved arms, and the bidirectional ratchet engaging tooth grooves and the bidirectional ratchet teeth are engaged.

[0023] Further, the two sides of the bidirectional ratchet engagement tooth groove are inclined surfaces, wherein the angle between the inclined surface facing the dose setting rotation direction and the tangent is smaller than the angle between the inclined surface away from the dose setting rotation direction and the tangent.

[0024] Further, the driving assembly comprises a driving rod, the driving rod comprises a driving rod sleeve and a driving rod cylinder, the driving rod sleeve is sleeved outside the driving rod cylinder and the driving rod sleeve and the driving rod cylinder are connected; a torsional spring is arranged between the driving rod sleeve and the driving rod cylinder;

[0025] One end of the driving rod is provided with a torsional spring fixing ring, and the torsional spring fixing ring is fixed in the shell;

[0026] One end of the torsional spring is fixed on the torsional spring fixing ring, the other end of the torsional spring is fixed on the driving rod, and the torsion direction of the torsional spring is set to be animal power in the dose setting direction;

[0027] When the trigger mechanism is triggered, the torsional spring drives the driving rod to reverse, thereby driving the injection assembly to move towards the medicine bottle, thereby realizing injection.

[0028] Further, the injection assembly comprises a limiting ring, a clutch and a push rod, the push rod is arranged inside the driving rod; the inner wall of the connection part of the shell and the medicine bottle support is provided with the limiting ring, the helical teeth on the inner wall of the limiting ring and the outer wall of the push rod are engaged; the clutch is arranged on one side of the limiting ring, the inner wall of the clutch is provided with a push rod engagement rib, the outer wall of the push rod is provided with an engagement rib groove, and the push rod engagement rib is embedded in the engagement rib groove;

[0029] The inner wall of the limiting ring is provided with a one-way engagement tooth, and the outer wall of the clutch is provided with a one-way ratchet tooth, the one-way engagement tooth and the one-way ratchet tooth are engaged;

[0030] The outer wall of the clutch is provided with a driving rod engagement tooth, and the inner wall of one end of the driving rod close to the medicine bottle support is provided with a clutch engagement tooth; when the trigger mechanism is triggered, the driving rod engagement tooth can be engaged with the clutch engagement tooth.

[0031] Further, one side of the clutch is provided with a limiting piece, and one end of the limiting ring is provided with a limiting piece buckle, the limiting piece buckle limits the clutch and the limiting piece in the limiting ring.

[0032] Further, the outer wall of one end of the second ring is provided with a dose setting ring engagement tooth, the inner wall of the dose setting ring is provided with a driving rod engagement tooth, and the dose setting ring engagement tooth and the driving rod engagement tooth are engaged.

[0033] Further, one end of the outer wall of the second ring is provided with dose setting ring engagement teeth, and the inner wall of the dose setting ratchet is provided with driving rod engagement teeth, the dose setting ring engagement teeth and the driving rod engagement teeth are engaged.

[0034] Further, the trigger mechanism is an injection button, and the injection button is arranged at the top end of the driving rod.

[0035] Further, the inner side of the injection button is provided with a buckle, and the inner wall of the top end of the driving rod is provided with a clamping strip, and the buckle is clamped in the inner side of the clamping strip.

[0036] Further, the inner wall of the driving rod is provided with a termination ring limiting groove, the outer wall of the termination ring is provided with an engagement rib, and the engagement rib is embedded in the termination ring limiting groove; further, when the driving rod rotates, the termination ring can be driven to rotate synchronously;

[0037] The outer wall of the push rod is provided with a helical tooth, and the inner wall of the termination ring is provided with a helical groove engaged with the helical tooth; further, during dose setting, the termination ring rotates in the forward direction while moving towards the end of the push rod; during injection, the termination ring rotates in the reverse direction while moving in the injection direction;

[0038] One end of the push rod close to the dose setting ring is provided with a termination ring engagement surface, and one end of the termination ring is provided with a push rod termination surface; when the push rod pushes the medicine bottle to complete the whole injection of the liquid medicine, the push rod termination surface abuts against the termination ring engagement surface.

[0039] During the last dose setting, if the dose setting amount is greater than the remaining dose, when the dose setting ring rotates in the range of the remaining dose, the push rod termination surface abuts against the termination ring engagement surface, and thus the dose setting cannot be continued.

[0040] Further, a scale is arranged between the housing and the driving rod, the inner wall of the housing is provided with scale engagement threads, and the outer wall of the scale is provided with housing engagement thread grooves; the scale engagement threads are embedded in the housing engagement thread grooves.

[0041] The inner wall of the scale is provided with driving rod engagement ribs, and the outer wall of the driving rod is provided with scale engagement rib grooves, and the driving rod engagement ribs are embedded in the scale engagement rib grooves.

[0042] The housing is provided with a customer observation window, and the outer wall of the scale is provided with a scale.

[0043] Compared with the prior art, the present application has the following beneficial effects:

[0044] The application provides a pen type injection device with drive, a two-way ratchet engaging tooth groove is arranged on the inner wall of the shell, a curved arm is arranged on the dose setting ring, and a two-way ratchet tooth is arranged on the curved arm; during dose setting, dose setting is realized through deformation and engagement of the curved arm; during dose correction, correction is also realized through deformation and engagement of the curved arm; therefore, correction can be realized in the case of dose setting error, injection accuracy is improved, and the use friendliness of the injection pen is improved.

[0045] The application arranges a torsional spring in the drive rod; during dose setting, the torsional spring stores power, provides driving force for subsequent self-injection, and realizes single-dose self-driven injection.

[0046] The application realizes that the dose setting cannot be set to be larger than the actual remaining dose through the engagement linkage of the termination ring and the push rod and the one-way ratchet tooth of the clutch; that is, the injection pen can judge and prompt the last remaining dose.

[0047] The engagement linkage of the termination ring and the push rod in the application locks the push rod through the termination ring after the dose is completely injected, the dose setting ring is constrained and cannot rotate, and then injection is impossible, so that the injection pen is safer, more reliable and intelligent.

[0048] In addition, the application can produce a "click" prompt sound through the engagement structure between the limiting ring and the clutch during injection, and can produce a "click" prompt sound through the engagement structure between the dose setting ring and the shell during dose setting and dose correction, so that the application has excellent interactive friendly design. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 It is an isometric view of the application;

[0050] Figure 2 It is an axial explosion view of embodiment one of the application;

[0051] Figure 3 It is an isometric view of the injection button described in the application;

[0052] Figure 4 It is a front view of the dose setting ring described in embodiment one;

[0053] Figure 5 It is a bottom view of the dose setting ring described in embodiment one;

[0054] Figure 6 It is an isometric view of the internal structure of the dose setting ring described in embodiment one;

[0055] Figure 7 It is a structural schematic view of the dose setting ratchet described in embodiment one;

[0056] Figure 8 Axonometric view of the torsion spring fixing ring of Example 1;

[0057] Figure 9 Axonometric view of the drive rod of Example 1;

[0058] Figure 10 Internal structure view of the drive rod of Example 1;

[0059] Figure 11 Axonometric view of the push rod of the present application;

[0060] Figure 12 Axonometric view of the scale of Example 1;

[0061] Figure 13 Axonometric view of the clutch of Example 1;

[0062] Figure 14 Axonometric view of the limit ring of the present application;

[0063] Figure 15 Axonometric view of the housing of the present application;

[0064] Figure 16 Internal structure view of the housing of the present application;

[0065] Figure 17 Top view of the housing of the present application;

[0066] Figure 18 Axonometric view of the end ring of the present application;

[0067] Figure 19 Internal structure view of the present application in initial state;

[0068] Figure 20 Internal structure view of the present application after dose setting;

[0069] Figure 21 Internal structure view of the present application after pressing the injection button;

[0070] Figure 22 Internal structure view of the present application after completion of injection.

[0071] Figure 23 Axial exploded view of Example 2 of the present application;

[0072] Figure 24 Front view of the dose setting ring of Example 2;

[0073] Figure 25 Top view of the dose setting ring of Example 2;

[0074] Figure 26 Bottom view of the dose setting ring for the dosage described in Example 2;

[0075] Figure 27 Internal structure diagram of the dose setting ring for the dosage described in Example 2;

[0076] Figure 28 Axonometric view of the internal structure of the dose setting ring for the dosage described in Example 2;

[0077] Figure 29 Axonometric view of the torsion spring fixing ring for the dosage described in Example 2;

[0078] Figure 30 Axonometric view of the drive rod for the dosage described in Example 2;

[0079] Figure 31 Internal structure diagram of the drive rod for the dosage described in Example 2;

[0080] Figure 32 Axonometric view of the scale for the dosage described in Example 2;

[0081] Figure 33 Axonometric view of the clutch for the dosage described in Example 2;

[0082] Figure 34 Internal structure diagram of the initial state for the dosage described in Example 2;

[0083] Figure 35 Internal structure diagram of the dosage setting state for the dosage described in Example 2;

[0084] Figure 36 Internal structure diagram of the injection button pressing state for the dosage described in Example 2;

[0085] Figure 37 Internal structure diagram of the injection completion state for the dosage described in Example 2.

[0086] Reference signs:

[0087] 1, injection button, 101, buckle; 2, compression spring;

[0088] 3, dose setting ring, 301, curved arm, 302, bidirectional ratchet tooth, 303, drive rod meshing tooth, 304, injection button termination surface, 305, housing limiting groove;

[0089] 4, torsion spring fixing ring, 401, torsion spring limiting groove, 402, scale termination limiting surface, 403, housing limiting rib;

[0090] 5, drive rod, 501, dose setting ring meshing tooth, 502, clamping strip, 503, termination ring limiting groove, 504, clutch meshing tooth, 505, scale meshing rib groove, 506, torsion spring lower limiting groove;

[0091] 6. push rod, 601, helical tooth, 602, engaging rib groove, 603, end ring engaging surface;

[0092] 7. torsion spring;

[0093] 8. scale, 801, housing engaging thread groove, 802, drive rod engaging rib, 803, end surface, 804, scale zero position limit surface;

[0094] 9. limit piece;

[0095] 10. clutch, 1001, push rod engaging rib, 1002, one-way ratchet tooth, 1003, drive rod engaging tooth;

[0096] 11. limit ring, 1101, one-way engaging tooth, 1102, limit piece buckle, 1103, scale end surface, 1104, push rod engaging trapezoidal thread;

[0097] 12. push rod top piece; 13. medicine bottle support;

[0098] 14. housing, 1401, bidirectional ratchet engaging tooth groove, 1402, scale engaging thread, 1403, observation window, 1404, annular convex rib, 1405, torsion spring fixing ring buckle hole, 1406, medicine bottle support fixing groove;

[0099] 15. medicine bottle; 16. pen cap;

[0100] 17. end ring, 1701, engaging rib, 1702, helical groove, 1703, push rod end surface;

[0101] 18. dose setting ratchet, 1801, drive tab, 19. drive arm. DETAILED DESCRIPTION

[0102] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are not all the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0103] It should be noted that, unless otherwise specified, the relative arrangement of components and steps, numerical expressions set forth in these embodiments should not be understood as limiting the scope of the present application.

[0104] ​The following description of example embodiments is merely illustrative in nature and is in no way intended to limit the application or its application or uses. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and apparatus should be considered as part of the present description.

[0105] Embodiment one

[0106] The embodiment provides a pen-type injection device with drive, comprising a trigger mechanism, a compression spring 2, a dose setting ring 3, a dose setting ratchet 18, a torsion spring fixing ring 4, a drive rod 5, a push rod 6, a torsion spring 7, a scale 8, a limiting sheet 9, a clutch 10, a limiting ring 11, a push rod top sheet 12, a medicine bottle support 13, a shell 14, a medicine bottle 15, a pen cap 16, and a termination ring 17. In the embodiment, the trigger mechanism is an injection button 1. As shown in Figure 1 and Figure 2 The pen cap 16 is internally provided with a medicine bottle support 13, and the medicine bottle support 13 internally accommodates a medicine bottle 15. The shell 14 is connected with the medicine bottle support 13. The dose setting ring 3 is arranged on the shell 14 and can rotate relative to the shell 14.

[0107] The dose setting ring 3 is configured to set a dose by forward rotation of the dose setting ring 3 relative to the shell 14, and correct the dose by reverse rotation of the dose setting ring 3 relative to the shell 14.

[0108] The dose setting ring 3 is internally provided with a dose setting ratchet 18. The inner wall of the dose setting ring 3 is provided with a drive arm 19. The outer wall of the dose setting ratchet 18 is provided with a drive protrusion 1801. The front end of the drive arm 19 abuts against the side wall of the drive protrusion 1801. During dose setting, the drive arm 19 pushes the drive protrusion 1801 to rotate.

[0109] The outer wall of the dose setting ratchet 18 is provided with a plurality of curved arms 301. The curved arms 301 are provided with bidirectional ratchet teeth 302. The inner wall of one end of the shell 14 is provided with bidirectional ratchet engaging tooth grooves 1401. The bidirectional ratchet engaging tooth grooves 1401 and the bidirectional ratchet teeth 302 are engaged.

[0110] The drive rod 5 is arranged in the shell 14. The drive rod 5 is internally provided with the push rod 6. The drive rod 5 is connected with the dose setting ratchet 18. When the dose setting ring 3 rotates, the drive rod 5 is driven to rotate by the dose setting ratchet 18. One end of the shell 14 is provided with an injection button 1. When the injection button 1 is triggered (pressed), the drive rod 5 reversely drives the push rod 6 to move towards the medicine bottle 15, thereby realizing injection.

[0111] AsFigure 3 The diagram shows the structure of the injection button 1. Two clips 101 are located on the inside of the injection button 1. A gap exists between the clips 101, facilitating their deformation and engagement. The injection button 1 engages the drive rod 5 via the clips 101. Furthermore, a circular protrusion is provided on the outer surface of the injection button 1 to increase friction when pressing the injection button 1 and prevent slippage.

[0112] like Figures 4 to 6 The diagram shows the structure of the dose setting ring 3. The dose setting ring 3 comprises a two-layer structure, specifically an inner cylinder and an outer cylinder. The outer cylinder is sleeved onto the outer surface of the inner cylinder, and the two are connected by a connecting plate in the middle. The outer cylinder is connected to the outer shell. The specific connection structure is as follows: a shell retaining groove 305 is provided on the lower inner wall of the outer cylinder, and a corresponding annular rib 1404 is provided on the outer surface of the outer shell 14. The annular rib 1404 is embedded in the shell retaining groove 305 to achieve the connection between the outer shell 14 and the dose setting ring 3.

[0113] In the space between the outer cylinder and the inner cylinder, a driving arm 19 is provided below the connecting plate. The clockwise direction is the advancing direction of the dose setting, and the front end of the driving arm 19 abuts against the driving protrusion 1801 of the dose setting ratchet 18 .

[0114] When the outer shell 14 is connected to the dose setting ring 3 , the upper end of the outer shell 14 is inserted into the space between the outer cylinder and the inner cylinder of the dose setting ring 3 .

[0115] In addition, the upper end of the inner cylinder of the dose setting ring 3 is an injection button stop surface 304 , which is used to limit the injection button 1 when it is pressed.

[0116] The outer surface of the dose setting ring 3 is further provided with an axial groove to increase the friction when the dose setting ring is rotated.

[0117] Figure 7 Figure 1 is a structural diagram of the dose setting ratchet 18. Drive rod engaging teeth 303 are provided on the inner wall of the dose setting ratchet 18 for driving the drive rod 5 to rotate. A curved arm 301 is provided on the outer wall of the dose setting ratchet 18. The curved arm 301 has one fixed end and a free end, so it is deformable. The curved arm 301 extends in a direction opposite to the dose setting rotational direction.

[0118] A bidirectional ratchet tooth 302 is provided on the outside of the bending arm 301. In this embodiment, two bending arms 301 are provided, and a bidirectional ratchet tooth 302 is provided on each bending arm 301; a bidirectional ratchet meshing tooth groove 1401 is provided on the inner wall of one end of the shell 14, and the bidirectional ratchet meshing tooth groove 1401 is engaged with the bidirectional ratchet teeth 302.

[0119] The outer wall of the dose setting ratchet 18 is further provided with two driving protrusions 1801, and the two driving protrusions 1801 and the two curved arms 301 are staggered. In addition, during dose setting, the front end of the driving arm 19 drives the driving protrusions 1801 to rotate, thereby driving the dose setting ratchet 18 to rotate. The curved arms 301 of the dose setting ratchet 18 are blocked by the bidirectional ratchet meshing tooth grooves 1401, the curved arms 301 are deformed to make the bidirectional ratchet teeth 302 mesh with the next bidirectional ratchet meshing tooth groove 1401. In the process of deformation and meshing, a "click" sound is produced, which increases the friendly experience.

[0120] As shown in Figure 8 The torsional spring fixing ring 4 is arranged inside the upper end of the shell 14, and the torsional spring fixing ring 4 is sleeved on the upper end of the driving rod 5. The upper surface of the torsional spring fixing ring 4 is provided with a torsional spring limiting groove 401, and a part of the torsional spring limiting groove 401 is a through hole structure for clamping one end of the torsional spring 7 in the torsional spring limiting groove 401. The lower surface of the torsional spring fixing ring 4 is provided with a scale end limiting surface 402 for limiting the scale 8. The outer surface of the torsional spring fixing ring 4 is provided with a shell limiting rib 403 which is a tooth-shaped structure for engaging with the bidirectional ratchet meshing tooth groove 1401. The shell limiting rib 403 is embedded in the bidirectional ratchet meshing tooth groove 1401, so that the torsional spring fixing ring 4 is limited in the shell 14. In addition, the outer wall of the torsional spring fixing ring 4 is further provided with a buckle which is clamped into the torsional spring fixing ring buckle hole 1405 in the inner wall of the shell 14, so that the torsional spring fixing ring 4 is fixedly connected with the shell 14.

[0121] As shown in Figure 9 and Figure 10 The driving rod 5 includes a driving rod sleeve and a driving rod cylinder. The driving rod sleeve is sleeved outside the driving rod cylinder, and the lower end of the driving rod sleeve is fixedly connected with the driving rod cylinder. In this embodiment, the driving rod sleeve and the driving rod cylinder are detachably connected. Specifically, the lower end of the driving rod sleeve is provided with a buckle, and the outer wall of the driving rod cylinder is provided with a clamping strip. The buckle and the clamping strip are clamped to achieve the connection of the driving rod sleeve and the driving rod cylinder.

[0122] The torsional spring 7 is arranged between the driving rod sleeve and the driving rod cylinder. The connection part of the driving rod sleeve and the driving rod cylinder is provided with a torsional spring lower limiting groove (not shown), and the lower end of the torsional spring 7 is clamped in the torsional spring lower limiting groove. The torsion direction of the torsional spring 7 is set to be along the dose setting direction.

[0123] The top outer wall of the driving rod 5 is provided with dose setting ring meshing teeth 501 which are engaged with the driving rod meshing teeth 303.

[0124] A plurality of scale engaging rib grooves 505 extending in the axial direction are provided on the outer wall of the driving rod 5, and a driving rod engaging rib 802 is provided on the inner wall of the scale 8. The driving rod engaging rib 802 is embedded in the scale engaging rib groove 505, so that when the driving rod 5 rotates, the scale 8 can rotate synchronously with the driving rod 5.

[0125] A clutch engaging tooth 504 is provided on the inner wall of the lower end of the driving rod 5, and a driving rod engaging tooth 1003 is provided on the outer wall of the clutch 10. When the injection button 1 is pressed, the driving rod 5 moves axially, and the driving rod engaging tooth 1003 can engage with the clutch engaging tooth 504.

[0126] like Figure 10 As shown, a clamping strip 502 is provided on the inner wall of the upper end of the driving rod 5 for clamping with the injection button 1 .

[0127] A termination ring limiting groove 503 is also provided on the inner wall of the lower end of the driving rod 5, and an engaging rib 1701 is provided on the outer wall of the termination ring 17. The engaging rib 1701 is embedded in the termination ring limiting groove 503, so that the termination ring 17 can only move along the axial direction of the driving rod 5, but cannot rotate relative to the driving rod 5.

[0128] like Figure 11 The figure shows the structure of the push rod 6. The push rod 6 is arranged inside the driving rod 5. The outer wall of the push rod 6 is provided with spiral teeth 601. The spiral teeth 601 are engaged with the termination ring 17 and the limit ring 11. The upper end of the push rod 6 is provided with a termination ring limit surface 603. By using the termination ring limit surface 603, the termination ring 17 can lock the push rod 6, thereby limiting the movement of the push rod 6.

[0129] Two engaging rib grooves 602 are further provided on the outer wall of the push rod 6 , and a push rod engaging rib 1001 is provided on the inner wall of the clutch 10 , and the push rod engaging rib 1001 is embedded in the engaging rib grooves 602 .

[0130] In addition, the lower end of the push rod 6 has a ball head, which cooperates with the spherical groove on the push rod top plate 12. Using the ball head, the push rod 6 pushes the push rod top plate 12 to move, and the push rod top plate 12 pushes the stopper in the medicine bottle 15 to move to achieve injection.

[0131] like Figure 12 The figure shows the structure of the scale 8. The outer wall of the scale 8 is provided with a shell engaging thread groove 801, and the inner wall of the shell 14 is provided with a scale engaging thread 1402. The scale engaging thread 1402 is embedded in the shell engaging thread groove 801; thus, the radial rotational movement of the scale 8 can be converted into a combination of axial movement and radial rotation.

[0132] The outer wall of the scale 8 may be provided with graduations, and during dose setting, the scale 8 can display the set dose. A stop surface 803 is provided at the upper end of the scale 8. This stop surface 803 contacts the scale stop limit surface 402 of the torsion spring retaining ring 4, defining the upper end of the scale 8. A scale zero limit surface 804 is provided at the lower end of the scale 8, defining the lower end of the scale 8.

[0133] A driving rod engaging rib 802 extending in the axial direction is provided on the inner wall of the scale 8 and matches with the scale engaging rib groove 505 on the outer wall of the driving rod 5 .

[0134] like Figure 13 The figure shows the structure of the clutch 10. The outer wall of the clutch 10 is provided with a driving rod meshing tooth 1003 and a one-way ratchet tooth 1002. The inner wall of the limiting ring 11 is provided with a one-way meshing tooth 1101. The one-way meshing tooth 1101 is meshed with the one-way ratchet tooth 1002. The clutch meshing tooth 504 is provided on the inner wall of the lower end of the driving rod 5. The driving rod meshing tooth 1003 and the clutch meshing tooth 504 can mesh.

[0135] A push rod engagement rib 1001 is provided on the inner wall of the clutch 10 , and the push rod engagement rib 1001 is embedded in the engagement rib groove 602 of the push rod 6 .

[0136] like Figure 14 This is a structural diagram of the limiting ring 11. The clutch 10 is arranged inside the limiting ring 11, and the limiting plate 9 is used to cover the clutch 10. A limiting plate buckle 1102 is provided on the limiting ring 11. The limiting plate buckle 1102 is engaged with the outer surface of the limiting plate 9, thereby fixing the clutch 10 inside the limiting ring 11.

[0137] The limiting ring 11 comprises a disc and a cylinder. The inner wall of the disc is provided with a push rod engaging trapezoidal thread 1104, which meshes with the spiral teeth 601 on the outer wall of the push rod 6. The inner wall of the cylinder is provided with one-way meshing teeth 1101, which mesh with the one-way ratchet teeth 1002 on the clutch 10, allowing the clutch 10 to rotate only in one direction relative to the limiting ring 11 and not in the opposite direction. Furthermore, when the one-way meshing teeth 1101 and the one-way ratchet teeth 1002 rotate relative to each other, they produce a "tapping" sound that continues throughout the injection process, making the design very user-friendly.

[0138] In this embodiment, the dose setting ring 3 rotates clockwise to set the dose, so the clutch 10 can only rotate counterclockwise and cannot rotate clockwise.

[0139] The upper end surface of the limiting ring 11 is also provided with a scale end surface 1103. When the scale 8 moves in the axial direction towards the limiting ring 11, the scale zero position limiting surface 804 contacts the scale end surface 1103, thereby limiting the lower end of the scale 8.

[0140] As shown in FIG. 1, the upper end of the housing 14 is provided with a double-sided ratchet engaging tooth groove 1401, which engages with the double-sided ratchet teeth 302 on the dose setting ring 3. Figures 15 to 17 As shown in FIG. 1, the upper end of the housing 14 is provided with a double-sided ratchet engaging tooth groove 1401, which engages with the double-sided ratchet teeth 302 on the dose setting ring 3.

[0141] The upper end of the housing 14 is provided with an annular protrusion 1404. Below the annular protrusion 1404, the outer wall of the housing 14 is provided with a torsion spring fixing ring buckle hole 1405. Below the torsion spring fixing ring buckle hole 1405, the housing is provided with an observation window 1403, through which the scale 8 can be observed, and thus the size of the dose set can be observed.

[0142] The inner wall of the housing 14 is provided with a scale engaging thread 1402. The lower end of the inner wall of the housing 14 is provided with a medicine bottle support fixing groove 1406. The outer wall of the medicine bottle support 13 is provided with a buckle, which is buckled into the medicine bottle support fixing groove 1406, thereby connecting the housing 14 and the medicine bottle support 13.

[0143] As shown in FIG. 1, the upper end of the housing 14 is provided with a double-sided ratchet engaging tooth groove 1401, which engages with the double-sided ratchet teeth 302 on the dose setting ring 3. Figure 17 As shown in FIG. 1, the upper end of the housing 14 is provided with a double-sided ratchet engaging tooth groove 1401, which engages with the double-sided ratchet teeth 302 on the dose setting ring 3.

[0144] As shown in FIG. 1, the upper end of the housing 14 is provided with a double-sided ratchet engaging tooth groove 1401, which engages with the double-sided ratchet teeth 302 on the dose setting ring 3. Figure 18 As shown in FIG. 1, the upper end of the housing 14 is provided with a double-sided ratchet engaging tooth groove 1401, which engages with the double-sided ratchet teeth 302 on the dose setting ring 3.

[0145] As shown in FIG. 1, the upper end of the housing 14 is provided with a double-sided ratchet engaging tooth groove 1401, which engages with the double-sided ratchet teeth 302 on the dose setting ring 3. Figure 19The initial state of the pen injection device provided by the embodiment is shown, the lower half is the cartridge structure, the upper half includes the dose setting and correction assembly, the self-driven injection assembly, the post-injection locking and residual amount monitoring assembly, and the trigger mechanism, the inner wall of the cap 16 is provided with a medicine bottle support 13, and the cap 16 is clamped with the medicine bottle support 13, so that the cap 16 can be smoothly removed or reinstalled from the medicine bottle support 13; the medicine bottle support 13 is internally provided with a medicine bottle 15, and a needle for injection can be installed at the lower end of the medicine bottle 15. The upper end of the medicine bottle 15 is closed by a rubber plug, and the rubber plug is provided with a push rod top piece 12, which is in contact with the push rod 6.

[0146] The upper end of the medicine bottle support 13 is clamped with a shell 14, the upper end of the shell 14 is connected with the dose setting ring 3, the inside of the shell 14 is provided with a scale 8, the inside of the scale 8 is provided with a drive rod 5, the inside of the drive rod 5 is provided with a push rod 6, the lower end of the drive rod 5 is provided with a stop ring 17 between the push rod 6, the lower side of the stop ring 17 is provided with a clutch 10, the lower side of the clutch 10 is provided with a limiting ring 11, the upper end of the limiting ring 11 is limited by the shell 14, and the lower end of the limiting ring 11 is limited by the medicine bottle support 13.

[0147] The side wall space of the drive rod 5 is provided with a torsion spring 7, the upper side of the drive rod 5 is externally provided with a torsion spring fixing ring 4, the upper side of the torsion spring fixing ring 4 is provided with a dose setting ratchet wheel 18, and the dose setting ratchet wheel 18 is clamped with the dose setting ring 3; the outer wall of the drive rod 5 is engaged with the dose setting ratchet wheel 18, the upper side of the drive rod 5 is provided with an injection button 1, and the injection button 1 is provided with a compression spring 2 between the dose setting ring 3.

[0148] In the initial state, the scale zero position limiting surface 804 of the scale 8 is in abutment with the scale stop surface 1103.

[0149] Figure 20 The state after dose setting of the embodiment is shown, the dose is set by rotating the dose setting ring 3 clockwise, after rotating the dose setting ring 3, through the engagement of the drive rod engagement teeth 303 and the dose setting ring engagement teeth 501, the dose setting ring 3 drives the drive rod 5 to rotate through the dose setting ratchet wheel 18, and the upper end of the torsion spring 7 is clamped on the torsion spring fixing ring 4, the torsion spring fixing ring 4 is fixed by the shell 14 and cannot rotate, therefore, the lower end of the torsion spring 7 rotates with the drive rod 5, and the force storage of the torsion spring 7 is completed.

[0150] At the same time, the bidirectional ratchet teeth 302 and the bidirectional ratchet engagement tooth grooves 1401 are engaged, the dose setting is realized through the deformation of the bending arm 301 and the cycle of engagement, in addition, due to the different angles of the two sides of the bidirectional ratchet engagement tooth grooves 1401, the positive direction angle is small, the reverse direction angle is large, combined with the deformation of the bending arm 301, the positive square dose setting and the reverse direction dose correction are realized.

[0151] At the same time, after rotating the dose setting ring 3, the drive rod 5 rotates, and the scale 8 rotates due to the engagement of the scale engagement thread 1402 of the housing 14, so that the scale 8 moves axially and rotates radially. After dose setting, the scale 8 moves a certain displacement towards the torsion spring fixing ring 4, and the scale on the scale 8 can be observed through the observation window 1403, that is, the dose setting amount.

[0152] In addition, the engagement rib 1701 of the termination ring 17 is embedded in the clutch engagement tooth 504 of the drive rod 5, and when the drive rod 5 rotates, the termination ring 17 rotates with it. However, the inner wall of the termination ring 17 also engages with the push rod 6, so that the termination ring 17 moves axially when it rotates radially, specifically, the termination ring 17 rotates and moves upward. That is, in the dose setting action, the rotation of the drive rod 5 drives the termination ring 17 to move away from the clutch 10, and in the injection action, it moves towards the clutch 10 with the rotation of the drive rod 5. In the initial state before dose setting, the termination ring 17 is in contact with the surface of the clutch 10, and after injection, it returns to this position. It can be understood that after each dose setting and injection action, the termination ring 17 completes a reciprocating motion.

[0153] Synchronously, it can be understood that if each dose setting is 10 units, when the last liquid medicine is less than 10 units, the push rod 6 moves to a relatively close position of the termination ring 17. At this time, assuming that the liquid medicine is only 5 units, the rotational displacement of the termination ring 17 relative to the termination ring engagement surface 603 is only 5 units of travel. It can be understood that the termination ring 17 also has a last dose setting counting function, and can interact with the user to set the last dose amount. The setting of the liquid medicine dose will not be allowed.

[0154] Specifically, because the one-way ratchet teeth 1002 on the clutch 10 and the one-way engagement teeth 1101 on the limiting ring 11 are engaged, the clutch 10 can only be allowed to rotate counterclockwise (injection rotation direction), and is not allowed to rotate clockwise (dose setting direction). Synchronously, the push rod engagement rib 1001 of the clutch 10 and the engagement rib groove 602 of the push rod 6 are engaged, and the rotation of the clutch 10 can control the rotation direction of the push rod 6. It can be understood that in the dose setting action, the clockwise rotation of the push rod 6 is constrained and not allowed. After the termination ring 17 and the termination ring engagement surface 603 at the end of the push rod come into contact, the push rod 6 cannot rotate clockwise, the termination ring 17 is constrained, the drive rod 5 is constrained, and the dose setting ring 3 cannot continue to rotate clockwise for dose setting.

[0155] As Figure 21As shown, after the injection button 1 is pressed, the injection button 1 drives the driving rod 5 to move downward, at this time, the driving rod engaging teeth 303 and the dose setting ring engaging teeth 501 are separated, the rotation of the driving rod 5 is not constrained, the torsion spring 7 is released, and the driving rod 5 is driven to rotate counterclockwise.

[0156] Synchronously, the clutch engaging teeth 504 and the driving rod engaging teeth 1003 change from the separated state to the engaged state, the driving rod 5 drives the clutch 10 to rotate counterclockwise, the clutch 10 drives the push rod 6 to rotate counterclockwise, the helical teeth 601 of the push rod 6 and the push rod engaging trapezoidal screw teeth 1104 of the limiting ring 11 are engaged, so that the push rod 6 rotates while moving axially and moving towards the rubber plug of the medicine bottle 15, and the rubber plug is pushed by the push rod top sheet 12, so that the medicine liquid is injected.

[0157] After the injection is completed, the injection button 1 is released, and the pen-type injection device will return to Figure 19 As shown, after each injection is completed, the push rod 6 moves relative to the direction of the rubber plug of the medicine bottle, until the medicine liquid in the medicine bottle 15 is completely injected, the push rod 6 moves to the farthest position relative to the driving rod 5, at this time, the termination ring engaging surface 603 and the push rod termination surface 1703 abut, at this time, the driving rod 5 is locked due to the locking of the termination ring 17, and the dose setting ring 3 can be understood as unable to set the dose, which is very friendly and intelligent to the user.

[0158] As shown Figure 22 As shown, after the injection is completed, at this time, the injection button 1 has not been released, but the torsion spring 7 has been released, and the push rod 6 has completed the movement of pushing the rubber plug, at this time, the scale 8 is reset, and the termination ring 17 is reset. Figure 22 As shown, the state is that the injection of the medicine liquid is completed, at this time, the push rod 6 and the termination ring 17 are engaged, and the dose setting ring 3 is constrained and cannot rotate.

[0159] Example Two

[0160] The embodiment provides a pen-type injection device with driving, which comprises a trigger mechanism, a compression spring 2, a dose setting ring 3, a torsion spring fixing ring 4, a driving rod 5, a push rod 6, a torsion spring 7, a scale 8, a limiting sheet 9, a clutch 10, a limiting ring 11, a push rod top sheet 12, a medicine bottle support 13, an outer shell 14, a medicine bottle 15, a pen cap 16 and a termination ring 17, in the embodiment, the trigger mechanism is an injection button 1. Figure 23 As shown, the medicine bottle support 13 is arranged in the pen cap 16, and the medicine bottle 15 is contained in the medicine bottle support 13; the outer shell 14 is connected with the medicine bottle support 13; the dose setting ring 3 is arranged on the outer shell 14 and can rotate relative to the outer shell 14.

[0161] A drive rod 5 is disposed within the housing 14, and the push rod 6 is disposed within the drive rod 5; the drive rod 5 is connected to the dose setting ring 3, and drives the drive rod 5 to rotate when the dose setting ring 3 rotates; an injection button 1 is disposed at one end of the housing 14. When the injection button 1 is triggered (pressed), the drive rod 5 reverses and drives the push rod 6 to move toward the medicine bottle 15, thereby achieving injection.

[0162] The structure of the injection button 1 is the same as that of the injection button 1 in the first embodiment, and will not be described again here.

[0163] like Figures 24 to 28 The diagram shows the structure of the dose setting ring 3. The dose setting ring 3 comprises a two-layer structure, specifically an inner cylinder and an outer cylinder. The outer cylinder is sleeved onto the outer surface of the inner cylinder, and the two are connected by a connecting plate in the middle. The inner wall of the inner cylinder is provided with a drive rod engaging tooth 303 for driving the drive rod 5 to rotate. The outer cylinder is connected to the outer shell. The specific connection structure is as follows: a shell retaining groove 305 is provided on the lower inner wall of the outer cylinder, and a corresponding annular rib 1404 is provided on the outer surface of the outer shell 14. The annular rib 1404 is embedded in the shell retaining groove 305 to achieve the connection between the outer shell 14 and the dose setting ring 3.

[0164] In the space between the outer and inner cylinders, a bending arm 301 is provided below the connecting plate. The bending arm 301 is connected to the outer wall of the inner cylinder. The bending arm 301 is a structure with one end fixed and the other end free, so it is deformable. The bending arm 301 extends in the direction opposite to the dose setting rotation direction.

[0165] A bidirectional ratchet tooth 302 is provided on the outside of the bending arm 301. In this embodiment, a plurality of bending arms 301 are arranged in an array along the inner cylindrical circumference, and a bidirectional ratchet tooth 302 is provided on each bending arm 301; a bidirectional ratchet meshing tooth groove 1401 is provided on the inner wall of one end of the shell 14, and the bidirectional ratchet meshing tooth groove 1401 is engaged with the bidirectional ratchet teeth 302.

[0166] When the housing 14 is connected to the dose setting ring 3 , the upper end of the housing 14 is inserted into the space between the outer cylinder and the curved arm of the dose setting ring 3 .

[0167] In addition, the upper end of the inner cylinder of the dose setting ring 3 is an injection button stop surface 304 , which is used to limit the injection button 1 when it is pressed.

[0168] The outer surface of the dose setting ring 3 is further provided with axial protrusions to increase the friction when the dose setting ring is rotated.

[0169] like Figure 29The structure of the torsion spring fixing ring 4 is shown. The torsion spring fixing ring 4 is arranged inside the upper end of the shell 14, and the torsion spring fixing ring 4 is sleeved on the upper end of the drive rod 5. The upper surface of the torsion spring fixing ring 4 is provided with a torsion spring limiting groove 401. A part of the torsion spring limiting groove 401 is a through hole structure, which is used for clamping one end of the torsion spring 7 in the torsion spring limiting groove 401. The lower surface of the torsion spring fixing ring 4 is provided with a scale end limiting surface 402, which is used for limiting the scale 8. The outer surface of the torsion spring fixing ring 4 is provided with a shell limiting rib 403. The inner part of the shell 14 is provided with a limiting groove matched with the shell limiting rib 403. The shell limiting rib 403 is inserted into the limiting groove in the inner part of the shell 14, so that the torsion spring fixing ring 4 is limited in the shell 14. In addition, the outer wall of the torsion spring fixing ring 4 is also provided with a buckle, which is buckled into the torsion spring fixing ring buckle hole 1405 in the inner wall of the shell 14, so that the torsion spring fixing ring 4 is fixedly connected with the shell 14.

[0170] As shown in Figure 30 and Figure 31 The structure of the drive rod 5 is shown. The drive rod 5 includes a drive rod sleeve and a drive rod cylinder. The drive rod sleeve is sleeved outside the drive rod cylinder, and the lower end of the drive rod sleeve is fixedly connected with the drive rod cylinder. A torsion spring 7 is arranged between the drive rod sleeve and the drive rod cylinder.

[0171] The connecting part of the drive rod sleeve and the drive rod cylinder is provided with a torsion spring lower limiting groove 506. The lower end of the torsion spring 7 is clamped in the torsion spring lower limiting groove 506. The torsion direction of the torsion spring 7 is set to rotate along the dose setting direction as animal power.

[0172] The top outer wall of the drive rod 5 is provided with a dose setting ring engagement tooth 501. The dose setting ring engagement tooth 501 is engaged with the drive rod engagement tooth 303.

[0173] The outer wall of the drive rod 5 is provided with a plurality of scale engagement rib grooves 505 extending in the axial direction. The inner wall of the scale 8 is provided with a drive rod engagement rib 802. The drive rod engagement rib 802 is embedded in the scale engagement rib groove 505. When the drive rod 5 rotates, the scale 8 can rotate synchronously with the drive rod 5.

[0174] The inner wall of the lower end of the drive rod 5 is provided with a clutch engagement tooth 504. The outer wall of the clutch 10 is provided with a drive rod engagement tooth 1003. When the injection button 1 is pressed, the drive rod 5 moves axially, and the drive rod engagement tooth 1003 can be engaged with the clutch engagement tooth 504.

[0175] As shown in Figure 31 The inner wall of the upper end of the drive rod 5 is provided with a clamping strip 502, which is used for clamping with the injection button 1.

[0176] A termination ring limiting groove 503 is also provided on the inner wall of the lower end of the driving rod 5, and an engaging rib 1701 is provided on the outer wall of the termination ring 17. The engaging rib 1701 is embedded in the termination ring limiting groove 503, so that the termination ring 17 can only move along the axial direction of the driving rod 5, but cannot rotate relative to the driving rod 5.

[0177] The structure of the push rod 6 is the same as that of the push rod 6 in the first embodiment, and will not be described again here.

[0178] like Figure 32 The figure shows the structure of the scale 8. The outer wall of the scale 8 is provided with a shell engaging thread groove 801, and the inner wall of the shell 14 is provided with a scale engaging thread 1402. The scale engaging thread 1402 is embedded in the shell engaging thread groove 801; thus, the radial rotational movement of the scale 8 can be converted into a combination of axial movement and radial rotation.

[0179] The outer wall of the scale 8 may be provided with graduations, and during dose setting, the scale 8 can display the set dose. A stop surface 803 is provided at the upper end of the scale 8. This stop surface 803 contacts the scale stop limit surface 402 of the torsion spring retaining ring 4, defining the upper end of the scale 8. A scale zero limit surface 804 is provided at the lower end of the scale 8, defining the lower end of the scale 8.

[0180] A driving rod engaging rib 802 extending in the axial direction is provided on the inner wall of the scale 8 and matches with the scale engaging rib groove 505 on the outer wall of the driving rod 5 .

[0181] like Figure 33 The figure shows the structure of the clutch 10. The outer wall of the clutch 10 is provided with a driving rod meshing tooth 1003 and a one-way ratchet tooth 1002. The inner wall of the limiting ring 11 is provided with a one-way meshing tooth 1101. The one-way meshing tooth 1101 is meshed with the one-way ratchet tooth 1002. The clutch meshing tooth 504 is provided on the inner wall of the lower end of the driving rod 5. The driving rod meshing tooth 1003 and the clutch meshing tooth 504 can mesh.

[0182] A push rod engagement rib 1001 is provided on the inner wall of the clutch 10 , and the push rod engagement rib 1001 is embedded in the engagement rib groove 602 of the push rod 6 .

[0183] The structure of the limiting ring 11 is the same as that of the limiting ring 11 in the first embodiment, and will not be described again here.

[0184] In this embodiment, the dose setting ring 3 rotates clockwise to set the dose, so the clutch 10 can only rotate counterclockwise and cannot rotate clockwise.

[0185] The structure of the housing is the same as that of the housing 14 in the first embodiment, and will not be described again here.

[0186] The structure of the termination ring 17 in the first embodiment is the same as that of the termination ring 17 in the first embodiment, and is not repeated here.

[0187] As Figure 34 The initial state of the pen-type injection device provided in the present embodiment is shown, the lower half is the cartridge structure, and the upper half is the driving and dose setting structure. The inner wall of the cap 16 is provided with a medicine bottle support 13, and the cap 16 is clamped with the medicine bottle support 13, so that the cap 16 can be smoothly removed or reinstalled from the medicine bottle support 13. The medicine bottle support 13 is internally provided with a medicine bottle 15, and the lower end of the medicine bottle 15 can be installed with a needle for injection. The upper end of the medicine bottle 15 is closed with a rubber plug, and the rubber plug is provided with a push rod top piece 12, which is in contact with the push rod 6.

[0188] The upper end of the medicine bottle support 13 is clamped with the shell 14, the upper end of the shell 14 is connected with the dose setting ring 3, the inside of the shell 14 is provided with a scale 8, the inside of the scale 8 is provided with a driving rod 5, the inside of the driving rod 5 is provided with a push rod 6, and the lower end of the driving rod 5 is provided with a termination ring 17 between the push rod 6. The clutch 10 is provided below the termination ring 17, the limit ring 11 is provided below the clutch 10, the upper end of the limit ring 11 is limited by the shell 14, and the lower end of the limit ring 11 is limited by the medicine bottle support 13.

[0189] The torsional spring 7 is arranged in the sidewall space of the driving rod 5, the upper end of the driving rod 5 is externally provided with a torsional spring fixing ring 4, the outer wall of the driving rod 5 above the torsional spring fixing ring 4 is engaged with the dose setting ring 3, the upper end of the driving rod 5 is provided with an injection button 1, and the injection button 1 is provided with a compression spring 2 between the dose setting ring 3.

[0190] In the initial state, the termination surface 803 of the scale 8 is in abutment with the scale termination limiting surface 402.

[0191] Figure 35 The state after dose setting of the present embodiment is shown. The dose is set by rotating the dose setting ring 3 clockwise. After rotating the dose setting ring 3, the driving rod engaging teeth 303 and the dose setting ring engaging teeth 501 are engaged, the dose setting ring 3 drives the driving rod 5 to rotate, and the upper end of the torsional spring 7 is clamped on the torsional spring fixing ring 4, which is fixed by the shell 14 and cannot rotate. Therefore, the lower end of the torsional spring 7 rotates with the driving rod 5, and the force storage of the torsional spring 7 is completed.

[0192] At the same time, the bidirectional ratchet teeth 302 and the bidirectional ratchet engaging tooth grooves 1401 are engaged, the dose is set through the deformation of the bending arm 301 and the cycle of engagement, and in addition, due to the different angles of the two sides of the bidirectional ratchet engaging tooth grooves 1401, the positive direction angle is small and the reverse direction angle is large, combined with the deformation of the bending arm 301, the positive square dose setting and the reverse direction dose correction are realized.

[0193] At the same time, after the dose setting ring 3 is rotated, the drive rod 5 rotates, driving the scale 8 to rotate. Since the scale 8 is engaged with the scale engagement thread 1402 of the housing 14, the scale 8 moves axially and rotates radially. After the dose is set, the scale 8 moves a certain distance toward the pen cap 16. The scale on the scale 8, i.e., the dose setting amount, can be observed through the observation window 1403.

[0194] Furthermore, the engagement ribs 1701 of the stop ring 17 are embedded in the clutch engagement teeth 504 of the drive rod 5. When the drive rod 5 rotates, the stop ring 17 rotates accordingly. However, the inner wall of the stop ring 17 also engages with the push rod 6. Therefore, while the stop ring 17 rotates radially, it also moves axially, specifically, rotating upward. That is, during dose setting, the rotation of the drive rod 5 drives the stop ring 17 away from the clutch 10. During injection, the stop ring 17 moves toward the clutch 10 as the drive rod 5 rotates. In the initial state, before dose setting, the stop ring 17 and the clutch 10 are in contact with each other, returning to this position after injection. This means that the stop ring 17 completes a reciprocating motion after each dose setting and injection.

[0195] At the same time, it can be understood that, assuming that each dose is set to 10 units, when the last medicine liquid is less than 10 units, the push rod 6 moves to a position closer to the termination ring 17. At this time, assuming that there are only 5 units of medicine liquid, the rotational movement displacement of the termination ring 17 relative to the termination ring meshing surface 603 is only 5 units of travel. It can be understood that the termination ring 17 also has a last dose setting counting function, which can interact with the user to determine the last dose setting amount. Exceeding the setting of the medicine liquid dose will not be allowed.

[0196] Specifically, due to the meshing arrangement of the one-way ratchet teeth 1002 on the clutch 10 and the one-way meshing teeth 1101 on the stop ring 11, the clutch 10 is only allowed to rotate counterclockwise (injection direction) and not clockwise (dose setting direction). Simultaneously, the push rod engagement rib 1001 of the clutch 10 engages with the engagement rib groove 602 of the push rod 6, thereby limiting the rotation of the clutch 10 and controlling the rotation direction of the push rod 6. It can be understood that during the dose setting operation, the push rod 6 is constrained from rotating clockwise. However, after the stop ring 17 contacts the stop ring engagement surface 603 at the end of the push rod, the push rod 6 cannot rotate clockwise. The stop ring 17 is constrained, which in turn constrains the drive rod 5, and the dose setting ring 3 is constrained, preventing it from continuing to rotate clockwise to set the dose.

[0197] like Figure 36 As shown, after the injection button 1 is pressed, the injection button 1 drives the drive rod 5 to move downward. At this time, the drive rod engagement teeth 303 and the dose setting ring engagement teeth 501 are separated, the rotation of the drive rod 5 is unconstrained, and the torsion spring 7 is released, driving the drive rod 5 to rotate counterclockwise.

[0198] Synchronously, the clutch engagement teeth 504 and the drive rod engagement teeth 1003 change from the disengaged state to the engaged state, the drive rod 5 drives the clutch 10 to rotate counterclockwise, the clutch 10 drives the push rod 6 to rotate counterclockwise, and the helical teeth 601 of the push rod 6 and the push rod engagement trapezoidal screw teeth 1104 of the limiting ring 11 are engaged, so that the push rod 6 rotates while moving axially and moving towards the rubber plug of the medicine bottle 15, and the rubber plug is pushed by the push rod top sheet 12, so that the medicine liquid is injected.

[0199] After the injection is completed, the injection button 1 is released, and the pen-type injection device will return to Figure 34 As shown in the initial state, after each injection is completed, the push rod 6 moves relative to the direction of the rubber plug of the medicine bottle, and after the medicine liquid in the medicine bottle 15 is completely injected, the push rod 6 moves to the most distal end position relative to the drive rod 5, at this time, the termination ring engagement surface 603 and the push rod termination surface 1703 abut, at this time, the drive rod 5 is locked due to the locking of the termination ring 17, and the dose setting ring 3 can be understood as being unable to set the dose, which is very friendly and intelligent to the user.

[0200] As shown in the initial state, after each injection is completed, the push rod 6 moves relative to the direction of the rubber plug of the medicine bottle, and after the medicine liquid in the medicine bottle 15 is completely injected, the push rod 6 moves to the most distal end position relative to the drive rod 5, at this time, the termination ring engagement surface 603 and the push rod termination surface 1703 abut, at this time, the drive rod 5 is locked due to the locking of the termination ring 17, and the dose setting ring 3 can be understood as being unable to set the dose, which is very friendly and intelligent to the user. Figure 37 As shown in the initial state, after each injection is completed, the push rod 6 moves relative to the direction of the rubber plug of the medicine bottle, and after the medicine liquid in the medicine bottle 15 is completely injected, the push rod 6 moves to the most distal end position relative to the drive rod 5, at this time, the termination ring engagement surface 603 and the push rod termination surface 1703 abut, at this time, the drive rod 5 is locked due to the locking of the termination ring 17, and the dose setting ring 3 can be understood as being unable to set the dose, which is very friendly and intelligent to the user. Figure 37 As shown in the initial state, after each injection is completed, the push rod 6 moves relative to the direction of the rubber plug of the medicine bottle, and after the medicine liquid in the medicine bottle 15 is completely injected, the push rod 6 moves to the most distal end position relative to the drive rod 5, at this time, the termination ring engagement surface 603 and the push rod termination surface 1703 abut, at this time, the drive rod 5 is locked due to the locking of the termination ring 17, and the dose setting ring 3 can be understood as being unable to set the dose, which is very friendly and intelligent to the user.

[0201] The above specific embodiments are only used to illustrate the technical solutions of the present application and not to limit it, although the present application has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A pen-type injection device with drive, comprising: a vial holder, the vial holder containing a vial; a housing, the housing being connected with the vial holder; characterized in that further comprising: a dose setting ring, the dose setting ring being rotatably connected with the housing; the dose setting ring being configured to set a dose by forward rotation of the dose setting ring relative to the housing, and to correct a dose by reverse rotation of the dose setting ring relative to the housing; a trigger mechanism, the trigger mechanism being disposed at one end of the housing; a self-driven injection assembly, the self-driven injection assembly comprising a drive assembly and an injection assembly, the drive assembly storing driving force during dose setting, and releasing driving force during dose correction; when the trigger mechanism is triggered, the drive assembly is able to drive the injection assembly to move towards the vial, and to achieve injection.

2. A pen-type injection device driven by a tape according to claim 1, characterized in that further comprising a post-injection locking and residual volume monitoring assembly, the post-injection locking and residual volume monitoring assembly being a termination ring, the termination ring being disposed between the drive rod and the push rod; the post-injection locking and residual volume monitoring assembly being configured to lock the injection assembly after all of the liquid in the vial is injected, and to prevent further injection; and the post-injection locking and residual volume monitoring assembly being configured to lock the injection assembly when the last dose setting is performed, and to only complete setting of the remaining dose when the dose setting amount is greater than the remaining dose.

3. A pen-type injection device driven by a tape according to claim 1, characterized in that a dose setting ratchet is disposed inside the dose setting ring, a drive arm is disposed on the inner wall of the dose setting ring, a drive protrusion is disposed on the outer wall of the dose setting ratchet, the front end of the drive arm abuts against the side wall of the drive protrusion, and the drive arm pushes the drive protrusion to rotate during dose setting; a plurality of curved arms are disposed on the outer wall of the dose setting ratchet, bidirectional ratchet teeth are disposed on the curved arms, bidirectional ratchet engaging tooth grooves are disposed on the inner wall of one end of the housing, and the bidirectional ratchet engaging tooth grooves and the bidirectional ratchet teeth are engaged.

4. A pen-type injection device driven by a tape according to claim 1, characterized in that bidirectional ratchet engaging tooth grooves are disposed on the inner wall of one end of the housing, a plurality of curved arms are disposed on the dose setting ring, and the curved arms extend in the reverse direction of the dose setting rotation direction; bidirectional ratchet teeth are disposed on the curved arms, and the bidirectional ratchet engaging tooth grooves and the bidirectional ratchet teeth are engaged.

5. A pen-type injection device driven by a tape according to claim 3 or 4, characterized in that the two sides of the bidirectional ratchet engaging tooth grooves are inclined surfaces, wherein the included angle between the inclined surface facing the dose setting rotation direction and the tangent is less than the included angle between the inclined surface away from the dose setting rotation direction and the tangent.

6. A pen-type injection device driven by a tape according to claim 2, characterized in that the drive assembly comprises a drive rod, the drive rod comprises a drive rod sleeve and a drive rod cylinder, the drive rod sleeve is sleeved outside the drive rod cylinder, and the drive rod sleeve and the drive rod cylinder are connected; a torsional spring is disposed between the drive rod sleeve and the drive rod cylinder; a torsional spring fixing ring is disposed at one end of the drive rod, and the torsional spring fixing ring is fixed in the housing; one end of the torsional spring is fixed on the torsional spring fixing ring, the other end of the torsional spring is fixed on the drive rod, and the torsional direction of the torsional spring is set to be animal power in the dose setting direction. When the trigger mechanism is triggered, the torsion spring drives the drive rod to reverse, and then drives the injection assembly to move towards the medicine bottle, thereby achieving injection.

7. A pen-type injection device driven by a belt as defined in claim 6, characterized in that The injection assembly comprises a limiting ring, a clutch and a push rod, and the push rod is arranged inside the drive rod; the inner wall of the connection part of the shell and the medicine bottle support is provided with the limiting ring, the helical teeth of the inner wall of the limiting ring are engaged with the outer wall of the push rod; the clutch is arranged on one side of the limiting ring, the inner wall of the clutch is provided with a push rod engaging rib, the outer wall of the push rod is provided with an engaging rib groove, and the push rod engaging rib is embedded in the engaging rib groove; The inner wall of the limiting ring is provided with a one-way engaging tooth, and the outer wall of the clutch is provided with a one-way ratchet tooth, and the one-way engaging tooth and the one-way ratchet tooth are engaged; The outer wall of the clutch is provided with a drive rod engaging tooth, and the inner wall of one end of the drive rod close to the medicine bottle support is provided with a clutch engaging tooth; when the trigger mechanism is triggered, the drive rod engaging tooth can be engaged with the clutch engaging tooth.

8. A pen-type injection device driven by a tape according to claim 7, characterized in that The outer wall of one end of the second ring is provided with a dose setting ring engaging tooth, the inner wall of the dose setting ring is provided with a drive rod engaging tooth, and the dose setting ring engaging tooth and the drive rod engaging tooth are engaged.

9. A pen-type injection device driven by a tape according to claim 7, characterized in that The outer wall of one end of the second ring is provided with a dose setting ring engaging tooth, the inner wall of the dose setting ring is provided with a drive rod engaging tooth, and the dose setting ring engaging tooth and the drive rod engaging tooth are engaged.

10. A pen-type injection device driven by a tape according to claim 8 or 9, characterized in that, The inner wall of the drive rod is provided with a termination ring limiting groove, and the outer wall of the termination ring is provided with an engaging rib embedded in the termination ring limiting groove; and when the drive rod rotates, the termination ring can rotate synchronously; The outer wall of the push rod is provided with a helical tooth, and the inner wall of the termination ring is provided with a helical groove engaged with the helical tooth; and when the dose is set, the termination ring rotates forward while moving towards the end of the push rod; when injection is performed, the termination ring rotates reversely while moving towards the injection direction; The end of the push rod close to the dose setting ring is provided with a termination ring engaging surface, and one end of the termination ring is provided with a push rod termination surface; when the push rod pushes the medicine bottle to complete the injection of all the liquid medicine, the push rod termination surface abuts against the termination ring engaging surface. When the last dose is set, if the dose setting amount is greater than the remaining dose, the push rod termination surface abuts against the termination ring engaging surface when the dose setting ring rotates within the range of the remaining dose, so that the dose cannot be continuously set.

11. A pen-type injection device driven by a tape according to claim 6, characterized in that A scale is arranged between the shell and the drive rod, the inner wall of the shell is provided with a scale engaging thread, and the outer wall of the scale is provided with a shell engaging thread groove; the scale engaging thread is embedded in the shell engaging thread groove; The inner wall of the scale is provided with a drive rod engaging rib, and the outer wall of the drive rod is provided with a scale engaging rib groove; the drive rod engaging rib is embedded in the scale engaging rib groove; A customer observation window is arranged on the shell, and a scale is arranged on the outer wall of the scale.

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