A dose setting mechanism for an injection device and an injection pen

Abstract

The application discloses an injection dose adjusting mechanism and an injection pen, and relates to the technical field of medical devices.The injection dose adjusting mechanism comprises coaxially arranged adjusting outer cylinders and driving inner cylinders.The adjusting outer cylinders are used for being screwed with pen shell assemblies, and the pen shell assemblies are used for providing mounting spaces for the injection dose adjusting mechanism.A plurality of ratchet grooves are arranged on the inner wall of one end of the adjusting outer cylinders, and each ratchet groove is continuously arranged around the central axis of the adjusting outer cylinders.The driving inner cylinders are arranged in the adjusting outer cylinders, and bidirectional ratchets are arranged on one end of the driving inner cylinders.The two ends of the bidirectional ratchets are provided with ratchet elastic sheets which can be embedded into the ratchet grooves.When the adjusting outer cylinders are positively rotated or reversely rotated relative to the driving inner cylinders, the ratchet elastic sheets can collide with the ratchet grooves to make sounds, so that sound prompt can be realized when the liquid medicine dose is increased or decreased.The injection dose adjusting mechanism disclosed by the application has few parts, simple assembly process and low production cost.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and more specifically, to an injection dosage adjustment mechanism and an injection pen. Background Art

[0002] Insulin injection therapy is a commonly used treatment method in clinical work. As a result, injection pens for insulin injection have been developed, which can accurately adjust the injection dose. In addition to insulin injection, injection pens can also be used for the injection of other drugs.

[0003] In the related art, the injection pen includes a pen barrel assembly, an injection dose adjustment mechanism, an injection mechanism and other structures. The pen barrel assembly serves as the installation base of the injection dose adjustment mechanism and the injection mechanism and other structures. The injection dose adjustment mechanism can adjust the injection dose of the liquid medicine, and the injection mechanism can be used to inject the liquid medicine. Among them, the injection dose adjustment mechanism includes an adjustment cylinder, a drive cylinder and Figure 1 The one-way wheel 10 shown in the figure is provided with an upper ratchet 11 and a lower ratchet 12. When the one-way wheel 10 rotates forward or reverse, the upper ratchet 11 and the lower ratchet 12 can respectively cooperate with the adjustment cylinder and the drive cylinder to produce a sound to provide a sound prompt for dose adjustment. However, this injection dose adjustment mechanism has the problems of a large number of parts and complicated assembly steps.

[0004] Therefore, how to reduce the number of parts of the injection dose adjustment mechanism and simplify the assembly steps has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the object of the present application is to provide an injection dose adjustment mechanism to reduce the number of parts of the injection dose adjustment mechanism and simplify the assembly steps.

[0006] Another object of the present application is to provide an injection pen comprising the above-mentioned injection dose adjustment mechanism.

[0007] An injection dose adjustment mechanism, comprising:

[0008] An adjusting outer barrel, the adjusting outer barrel being threadably engaged with the pen housing assembly, and having a plurality of ratchet grooves disposed on an inner wall of one end of the adjusting outer barrel, the ratchet grooves being continuously arranged around the central axis of the adjusting outer barrel;

[0009] The driving inner cylinder is arranged in the adjusting outer cylinder and is coaxially arranged with the adjusting outer cylinder, and one end of the driving inner cylinder is provided with a bidirectional ratchet, and both ends of the bidirectional ratchet are provided with ratchet springs embedded in the ratchet groove, and the driving inner cylinder and the bidirectional ratchet are an integrated structure, the driving inner cylinder is used for transmission connection with the injection mechanism, and the forward or reverse rotation of the adjusting outer cylinder drives the ratchet springs of the bidirectional ratchet to collide with the ratchet groove to make a sound.

[0010] Optionally, in the above-mentioned injection dose adjustment mechanism, a first step surface is provided on the adjustment outer cylinder, and a second step surface is provided on the drive inner cylinder. Along the axial direction of the adjustment outer cylinder, the first step surface and the second step surface are arranged facing each other, and a first transmission part is provided on the first step surface, and a second transmission part is provided on the second step surface.

[0011] When the first transmission part and the second transmission part are disconnected, the adjustment outer cylinder and the driving inner cylinder are in a rotationally separated state, and the forward or reverse rotation of the adjustment outer cylinder drives the ratchet spring of the bidirectional ratchet to collide with the ratchet groove and produce a sound; when the first transmission part and the second transmission part are connected, the adjustment outer cylinder and the driving inner cylinder are in a rotationally coupled state and can rotate synchronously.

[0012] Optionally, in the above-mentioned injection dose adjustment mechanism, the first transmission portion includes a transmission protrusion protruding in the direction where the second step surface is located, and the second transmission portion includes a transmission groove for the transmission protrusion to be inserted into; or the second transmission portion includes a transmission protrusion protruding in the direction where the first step surface is located, and the first transmission portion includes a transmission groove for the transmission protrusion to be inserted into;

[0013] The transmission protrusion has two first side walls arranged at an angle, and the first side walls are arranged at an angle to the axial direction of the adjustment outer cylinder. The transmission protrusion has two second side walls arranged at an angle, and the second side walls are arranged at an angle to the axial direction of the adjustment outer cylinder. When the first transmission part and the second transmission part are in transmission connection, the second side wall abuts against the first side wall.

[0014] Optionally, in the above-mentioned injection dose adjustment mechanism, the transmission grooves are a plurality of transmission grooves continuously arranged around the central axis of the adjustment outer cylinder;

[0015] The number of the transmission protrusions is less than or equal to the number of the transmission grooves, and the transmission protrusions are arranged at equal intervals or continuously around the central axis of the adjustment outer cylinder.

[0016] Optionally, in the above-mentioned injection dose adjustment mechanism, a rotating wheel is provided between the adjustment outer cylinder and the driving inner cylinder;

[0017] An axial sliding groove and an axial guide rail are respectively provided on the side walls of the rotating wheel and the adjusting outer cylinder facing each other. The axial sliding groove passes through the axial direction of the rotating wheel, and the axial guide rail extends along the axial direction of the adjusting outer cylinder. The axial sliding groove and the axial guide rail are embedded and slidably matched.

[0018] A first external thread is provided on the outer wall of the driving inner cylinder, and a first internal thread threadably matched with the first external thread is provided on the inner wall of the rotating wheel.

[0019] Optionally, the above-mentioned injection dose adjustment mechanism further includes a button, which is movably provided on the adjustment outer cylinder and is used to switch the adjustment outer cylinder and the driving inner cylinder from a rotationally separated state to a rotationally coupled state.

[0020] Optionally, in the above-mentioned injection dose adjustment mechanism, the button includes an outer cylinder portion and an inner cylinder portion that are coaxially arranged and connected, the inner cylinder portion is disposed inside the outer cylinder portion, and when the button is in a pressed state, the inner cylinder portion abuts against the driving inner cylinder, and the outer cylinder portion abuts against the adjustment outer cylinder;

[0021] An installation space is provided on the adjustment outer cylinder, a sliding protrusion is provided on the outer wall of the outer cylinder portion, the sliding protrusion is slidably provided in the installation space, and a first limiting protrusion is provided at the end of the installation space to limit the sliding protrusion in the installation space.

[0022] Optionally, in the above-mentioned injection dose adjustment mechanism, a second limiting protrusion is provided on the outer wall of the outer cylinder portion, the second limiting protrusion is provided outside the installation space, and when the button is in a pressed state, the second limiting protrusion abuts against the first limiting protrusion.

[0023] Optionally, in the above-mentioned injection dose adjustment mechanism, the number of the bidirectional ratchets is at least two and they are arranged at equal intervals around the central axis of the adjustment outer cylinder.

[0024] An injection pen, comprising:

[0025] Pen case assembly;

[0026] An injection mechanism is provided on the pen housing assembly;

[0027] The injection dose adjustment mechanism is threadedly matched with the pen housing assembly, and the driving inner cylinder is transmission-connected with the injection mechanism.

[0028] Optionally, in the above-mentioned injection pen, the injection mechanism includes a push screw and a bottle cap frame, the push screw is threadedly engaged with the bottle cap frame and is transmission-connected to the driving inner cylinder, the bottle cap frame is disposed in the pen housing assembly, and a one-way locking groove is provided on the bottle cap frame;

[0029] It also includes a locking push rod, which is arranged between the driving inner cylinder and the pushing screw. The locking push rod, the driving inner cylinder and the pushing screw are coaxially arranged and can rotate together, and the driving inner cylinder and the pushing screw can both slide axially relative to the locking push rod. The locking push rod is provided with a one-way locking ratchet that cooperates with the one-way locking groove.

[0030] The injection dose adjustment mechanism provided herein comprises a coaxially arranged adjustment outer cylinder and a driving inner cylinder. The adjustment outer cylinder is threadedly engaged with a pen housing assembly, which provides mounting space for the injection dose adjustment mechanism. Multiple ratchet grooves are provided on the inner wall of one end of the adjustment outer cylinder, and the ratchet grooves are arranged continuously around the central axis of the adjustment outer cylinder. The driving inner cylinder is disposed within the adjustment outer cylinder and has a bidirectional ratchet at one end. Both ends of the bidirectional ratchet are provided with elastic ratchet springs that can be embedded in the ratchet grooves. The driving inner cylinder and the bidirectional ratchet are an integrated structure, which facilitates direct production by injection molding and other methods, reducing production and assembly costs. The driving inner cylinder is connected to the injection mechanism in a transmission manner to drive the injection mechanism to inject the liquid during the injection process.

[0031] Compared with the related art, the injection dose adjustment mechanism provided in the present application realizes the sound prompt function of adjusting the outer cylinder during bidirectional rotation by directly integrating a bidirectional ratchet on the driving inner cylinder, eliminating the setting of a one-way wheel, reducing the number of parts, simplifying the assembly steps, lowering the matching accuracy requirements between the assembly parts, and reducing the defective rate; and it has a simple structure and low production cost.

[0032] The injection pen provided herein includes a housing assembly, an injection mechanism, and the aforementioned dosage adjustment mechanism. The dosage adjustment mechanism is threadedly engaged with the housing assembly, and the driving inner cylinder is transmission-connected to the injection mechanism. Due to the aforementioned dosage adjustment mechanism, the pen also possesses the aforementioned structure and beneficial effects. Other structural features are referenced to the prior art and will not be further described here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a structural schematic diagram of a one-way wheel in the prior art;

[0035] Figure 2 This is an axonometric view of the injection pen disclosed in an embodiment of the present application;

[0036] Figure 3 This is an exploded view of the injection pen disclosed in the embodiment of the present application;

[0037] Figure 4 A cross-sectional view of the injection pen disclosed in an embodiment of the present application;

[0038] Figure 5 for Figure 4 Cross-section at AA in the middle;

[0039] Figure 6 A top view of the adjustment outer cylinder disclosed in an embodiment of the present application;

[0040] Figure 7 for Figure 6 Cross-section at the middle BB;

[0041] Figure 8 This is an axonometric view of the driving inner cylinder disclosed in an embodiment of the present application;

[0042] Figure 9 A top view of the driving inner cylinder disclosed in an embodiment of the present application;

[0043] Figure 10 for Figure 9 Cross-section at the middle CC;

[0044] Figure 11 An axonometric diagram of a button disclosed in an embodiment of the present application;

[0045] Figure 12 This is an axonometric view of the rotating wheel disclosed in an embodiment of the present application;

[0046] Figure 13 This is an axonometric view of the locking push rod disclosed in an embodiment of the present application.

[0047] Among them, 10 is a one-way wheel, 11 is an upper ratchet, and 12 is a lower ratchet;

[0048] 100 is the injection dose adjustment mechanism, 110 is the adjustment outer cylinder, 111 is the ratchet groove, 112 is the first transmission part, 113 is the second external thread, 114 is the first limiting protrusion, 115 is the axial guide rail, 116 is the installation space, 117 is the first step surface, 120 is the driving inner cylinder, 121 is the bidirectional ratchet, 122 is the first external thread, 123 is the first inner hole, 124 is the guide protrusion, 125 is the second transmission part, 126 is the second step surface, 130 is the button, 131 is the second limiting protrusion, 132 is the sliding protrusion, 140 is the rotating wheel, 141 is the axial sliding groove, and 142 is the first internal thread;

[0049] 200 is the pen housing assembly, 210 is the upper pen housing, 211 is the dosage window, 220 is the bottle holder, and 230 is the pen cap;

[0050] 300 is the injection mechanism, 310 is the pushing screw, 320 is the bottle cap holder, and 330 is the screw gasket;

[0051] 400 is a locking push rod, 401 is a guide groove, 402 is a one-way locking ratchet, and 403 is a second inner hole;

[0052] 500 is a medicine bottle assembly, 510 is a medicine bottle, and 520 is a bottle stopper. DETAILED DESCRIPTION

[0053] The core of this application is to disclose an injection dose adjustment mechanism to reduce the number of parts of the injection dose adjustment mechanism and simplify the assembly steps.

[0054] Another core of the present application is to disclose an injection pen comprising the above-mentioned injection dose adjustment mechanism.

[0055] The following embodiments are described with reference to the accompanying drawings. The embodiments shown below do not limit the inventions described in the claims. Furthermore, the entire contents of the configurations shown in the following embodiments are not limited to those necessary for the solutions to the inventions described in the claims. It should be noted that, for ease of description, only the portions relevant to the inventions are shown in the accompanying drawings. The embodiments and features in the embodiments of this application may be combined with each other unless there is a conflict.

[0056] In the injection pen of the related art, Figure 1The upper ratchet 11 and the lower ratchet 12 of the one-way wheel 10 are both one-way ratchets. In the dose adjustment state, the adjusting cylinder and the driving cylinder are in a rotationally separated state. When the adjusting cylinder is rotated clockwise: the adjusting cylinder is separated from the upper ratchet 11 of the one-way wheel, and the lower ratchet 12 of the one-way wheel is coupled with the driving cylinder. The upper ratchet 11 of the one-way wheel and the ratchet of the adjusting cylinder rotate relative to each other, thereby realizing a sound prompt when the adjusting cylinder is rotated clockwise; when the adjusting cylinder is rotated counterclockwise: the adjusting cylinder is coupled with the upper ratchet 11 of the one-way wheel, and the lower ratchet 12 of the one-way wheel is separated from the driving cylinder. The lower ratchet 12 of the one-way wheel and the ratchet of the driving cylinder rotate relative to each other, thereby realizing a sound prompt when the adjusting cylinder is rotated counterclockwise. In the aforementioned related technologies, the dimensional accuracy requirements for the one-way wheel 10 are high. The assembly precision requirements for the one-way wheel 10, the adjustment cylinder, and the drive cylinder, which are both handpieces, are also high, resulting in complex assembly steps. During assembly, the springs of the ratchet teeth can be easily crushed and damaged, causing assembly failure. Furthermore, the one-way wheel 10 suffers from a short axial guide, which can easily deflect or tilt during rotation, causing uneven rotation and poor reliability. Based on these considerations, the present application discloses the following injection dose adjustment mechanism and injection pen.

[0057] Combine Figure 2-13 The injection dose adjustment mechanism 100 disclosed in the embodiment of the present application is applied to an injection pen. The injection dose adjustment mechanism 100 includes a coaxially arranged adjustment outer cylinder 110 and a driving inner cylinder 120. The adjustment outer cylinder 110 is used to threadably cooperate with the pen housing assembly 200, and the pen housing assembly 200 is used to provide an installation space 116 for the injection dose adjustment mechanism 100. A plurality of ratchet grooves 111 are provided on the inner wall of one end of the adjustment outer cylinder 110. The ratchet grooves 111 are continuously arranged around the central axis of the adjustment outer cylinder 110; the driving inner cylinder 120 is disposed within the adjustment outer cylinder 110, and a bidirectional ratchet 121 is provided at one end of the driving inner cylinder 120. Both ends of the bidirectional ratchet 121 are provided with ratchet springs that can be embedded in the ratchet grooves 111, and the ratchet springs are elastic. The driving inner cylinder 120 and the bidirectional ratchet 121 are an integrated structure, which is convenient for direct production by injection molding or other methods, thereby reducing production and assembly costs. The driving inner cylinder 120 is used for transmission connection with the injection mechanism 300 to drive the injection mechanism 300 to inject the liquid medicine during the injection process.

[0058] To simplify the description and facilitate understanding, the rotation of the outer cylinder 110 in the direction of increasing the injection dose is defined as positive rotation. Figure 4 Move upward, adjust the outer cylinder 110 to rotate in the direction of reducing the injection dose to reverse, and adjust the outer cylinder 110 to rotate in the direction of reducing the injection dose to reverse. Figure 4 It should be noted that, by reasonably setting the shapes of the ratchet spring piece and the ratchet groove 111, it can be ensured that the outer cylinder 110 can be adjusted to drive the inner cylinder 120 to rotate forward and reverse relative to each other.

[0059] The adjusting outer cylinder 110 and the driving inner cylinder 120 have a rotationally separated state and a rotationally coupled state. When the adjusting outer cylinder 110 and the driving inner cylinder 120 are in the rotationally separated state, the dose can be adjusted. At this time, the adjusting outer cylinder 110 rotates forward or reversely relative to the driving inner cylinder 120, and the ratchet spring can jump and collide with the ratchet groove 111 to make a sound, thereby realizing a sound prompt when the dose is increased or decreased; when the adjusting outer cylinder 110 and the driving inner cylinder 120 are in the rotationally coupled state, the drug solution can be injected. At this time, the adjusting outer cylinder 110 and the driving inner cylinder 120 are transmission connected and can rotate synchronously on the pen housing assembly 200, so that the injection mechanism 300 can be driven by the driving inner cylinder 120 to inject the drug solution.

[0060] Compared with the related art, the injection dose adjustment mechanism 100 disclosed in the embodiment of the present application realizes the sound prompt function of adjusting the outer cylinder 110 during bidirectional rotation by directly integrating the bidirectional ratchet 121 on the driving inner cylinder 120, eliminating the setting of the one-way wheel, reducing the number of parts, simplifying the assembly steps, lowering the matching accuracy requirements between the assembly parts, and reducing the defective rate; and it has a simple structure and low production cost.

[0061] Furthermore, the bidirectional ratchet 121 in the present application occupies less axial space, so the stability and reliability of the cooperation between the bidirectional ratchet 121 and the ratchet groove 111 can be ensured by appropriately extending the axial dimensions of the bidirectional ratchet 121 and the ratchet groove 111, and in the rotational separation state and the rotational coupling state, the bidirectional ratchet 121 and the ratchet groove 111 are maintained in a state of mutual embedding and cooperation.

[0062] During the injection of the liquid medicine, the regulating outer cylinder 110 and the driving inner cylinder 120 are in a rotationally coupled state. The regulating outer cylinder 110 and the driving inner cylinder 120 are synchronously translated and rotated on the pen housing assembly 200. Accordingly, a first step surface 117 is provided on the regulating outer cylinder 110, and a second step surface 126 is provided on the driving inner cylinder 120. Along the axial direction of the regulating outer cylinder 110, the first step surface 117 and the second step surface 126 are arranged facing each other. When the regulating dose increases, the regulating outer cylinder 110 moves to the right. Figure 4The adjusting outer cylinder 110 moves upward in the middle of the adjusting cylinder 110, and the contact between the first step surface 117 and the second step surface 126 can push the driving inner cylinder 120 to move synchronously along the axial direction. In order to achieve rotational coupling between the adjusting outer cylinder 110 and the driving inner cylinder 120, a first transmission portion 112 is provided on the first step surface 117, and a second transmission portion 125 is provided on the second step surface 126. When the transmission between the first transmission portion 112 and the second transmission portion 125 is disconnected, the adjusting outer cylinder 110 and the driving inner cylinder 120 are in the aforementioned rotationally separated state. At this time, the forward or reverse rotation of the adjusting outer cylinder 110 can drive the ratchet spring of the bidirectional ratchet 121 to collide with the ratchet groove 111 to produce a sound. When the first transmission portion 112 and the second transmission portion 125 are in transmission connection, the adjusting outer cylinder 110 and the driving inner cylinder 120 are in a rotationally coupled state and can rotate synchronously, and injection of the liquid medicine can be performed at this time.

[0063] Specifically, in some embodiments, the first transmission portion 112 includes a transmission protrusion protruding in the direction of the second step surface 126, and the second transmission portion 125 includes a transmission groove for the transmission protrusion to be embedded; or, the transmission protrusion and the transmission groove can be interchanged, that is, the second transmission portion 125 includes a transmission protrusion protruding in the direction of the first step surface 117, and the first transmission portion 112 includes a transmission groove for the transmission protrusion to be embedded. Figure 4 、 Figure 7 and Figure 8 , which shows a technical solution in which the first transmission part 112 includes a transmission groove and the second transmission part 125 includes a transmission protrusion. The transmission protrusion has two first side walls arranged at an angle, and the first side walls are arranged at an angle to the axial direction of the adjustment outer cylinder 110. The transmission protrusion has two second side walls arranged at an angle, and the second side walls are arranged at an angle to the axial direction of the adjustment outer cylinder 110. When the first transmission part 112 and the second transmission part 125 are in transmission connection, the second side walls are in contact with the first side walls. In other words, the cross-sections of the transmission groove and the transmission protrusion are both triangular, and the relative axial movement of the transmission protrusion and the transmission groove facilitates transmission assembly of the two. At the same time, during the rotation of the first transmission part 112, the first side wall or the second side wall has a tendency to separate axially, thereby facilitating the switching of the adjustment outer cylinder 110 and the driving inner cylinder 120 from a rotationally coupled state to a rotationally decoupled state through the rotation of the adjustment outer cylinder 110.

[0064] Combine Figure 6 and Figure 7The transmission grooves are multiple and continuously arranged around the central axis of the adjusting outer cylinder 110 to ensure that the first transmission part 112 and the second transmission part 125 can reliably engage and transmit at different rotation angles; the number of transmission protrusions can be less than or equal to the number of transmission grooves, and each transmission protrusion is also arranged at equal intervals or continuously around the central axis of the adjusting outer cylinder 110. The number of transmission protrusions is less than the number of transmission grooves, which can reduce the friction when the transmission grooves and the transmission protrusions are separated. The number of transmission protrusions is equal to the number of transmission grooves, which can ensure reliable transmission between the first transmission part 112 and the second transmission part 125.

[0065] In some embodiments disclosed in the present application, a rotating wheel 140 is provided between the adjusting outer cylinder 110 and the driving inner cylinder 120. The rotating wheel 140 is threadedly engaged with the driving inner cylinder 120 and is coaxially driven with the adjusting outer cylinder 110. The rotating wheel 140 is used to memorize the total injection stroke of a vial assembly 500. Specifically, in combination with Figure 8 A first external thread 122 is provided on the outer wall of the driving inner cylinder 120, and a first internal thread 142 is provided on the inner wall of the rotating wheel 140, which is threadably matched with the first external thread 122. Through the threaded matching of the first external thread 122 and the first internal thread 142, the rotating wheel 140 can move axially relative to the driving inner cylinder 120. An axial groove 141 and an axial guide rail 115 are respectively provided on the side walls of the rotating wheel 140 and the adjusting outer cylinder 110 facing each other. The axial guide rail 115 is provided in the axial groove 141, so that during the dose adjustment process, the rotation of the adjusting outer cylinder 110 can drive the rotating wheel 140 to rotate synchronously relative to the driving inner cylinder 120, and the axial groove 141 passes through the axial direction of the rotating wheel 140, and the axial guide rail 115 extends along the axial direction of the adjusting outer cylinder 110. The axial guide rail 115 is embedded in and slidably matched with the axial groove 141, so that the rotating wheel 140 can slide axially relative to the adjusting outer cylinder 110 when rotating, thereby adapting to the axial position movement of the rotating wheel 140 relative to the adjusting outer cylinder 110 during the dose adjustment process.

[0066] In the dose adjustment process, the adjustment outer cylinder 110 is in the rotational separation state with the driving inner cylinder 120, the driving inner cylinder 120 can only be axially translated and cannot be rotated, the adjustment outer cylinder 110 is synchronously rotated with the rotating wheel 140, and the rotating wheel 140 has an axial displacement relative to the driving inner cylinder 120. The total axial moving stroke of the rotating wheel 140 on the driving inner cylinder 120 corresponds to the total medicament injection stroke of one medicine bottle assembly 500, and in one medicine injection process, the axial moving stroke of the rotating wheel 140 on the driving inner cylinder 120 in the dose adjustment process corresponds to the moving stroke of the injection mechanism 300 in the medicine injection process, when the axial moving stroke of the rotating wheel 140 on the driving inner cylinder 120 is exhausted, the rotating wheel 140 is locked, the operator cannot continue to rotate the adjustment outer cylinder 110 to increase the injection dose, thereby playing a role in prompting the residual dose of the medicine in the medicine bottle assembly 500, especially in the case of multiple injections of one medicine bottle assembly 500, the maximum dose of the medicine in the medicine bottle assembly 500 in the last injection can be prompted. In the injection process, the adjustment outer cylinder 110 is in the rotational coupling state with the driving inner cylinder 120, at this time, the adjustment outer cylinder 110, the driving inner cylinder 120 and the rotating wheel 140 are synchronously rotated and moved downward as a whole, and the driving inner cylinder 120 can drive the injection mechanism 300 to push the medicine.

[0067] In some embodiments disclosed in the present application, the injection dose adjustment mechanism 100 further comprises a button 130, which is movably arranged on the adjustment outer cylinder 110 and used to switch the adjustment outer cylinder 110 and the driving inner cylinder 120 from the rotational separation state to the rotational coupling state. Specifically, when the button 130 is in the released state, the medicine dose is set or adjusted, at this time, the adjustment outer cylinder 110 and the driving inner cylinder 120 are in the rotational separation state, and the forward rotation or reverse rotation of the adjustment outer cylinder 110 relative to the driving inner cylinder 120 can make the ratchet spring and the ratchet groove 111 collide and emit sound, thereby realizing the sound prompt; when the button 130 is in the pressed state, the medicine is injected or exhausted, at this time, the adjustment outer cylinder 110 and the driving inner cylinder 120 are in the rotational coupling state, the button 130 abuts against the adjustment outer cylinder 110 and the driving inner cylinder 120, and the synchronous axial movement and rotation of the adjustment outer cylinder 110, the driving inner cylinder 120 and the rotating wheel 140 can be realized by pressing the button 130 towards the medicine bottle assembly 500, thereby enabling the driving inner cylinder 120 to drive the injection mechanism 300 to push the medicine. The setting of the button 130 facilitates the pressing operation of the operator.

[0068] In the natural state, the button 130 is in a released state on the regulating outer cylinder 110. When the operator applies pressure to the button 130, the regulating outer cylinder 110 and the driving inner cylinder 120 can be switched from a rotationally separated state to a rotationally coupled state. After releasing the pressure on the button 130, the transmission groove of the regulating outer cylinder 110 can provide an axial separation thrust to the transmission protrusion by rotating, thereby switching the regulating outer cylinder 110 and the driving inner cylinder 120 from a rotationally coupled state to a rotationally separated state.

[0069] In some embodiments disclosed in the present application, the button 130 includes an outer cylinder portion and an inner cylinder portion that are coaxially arranged and connected. The outer cylinder portion and the inner cylinder portion are both cylindrical, and the ends of the two away from the driving inner cylinder 120 can be connected through an end plate with a planar structure or an arc-shaped structure. The inner cylinder portion is arranged in the outer cylinder portion, and the inner cylinder portion is used to extend into the adjusting outer cylinder 110 and push the driving inner cylinder 120 to move to a position of rotational coupling with the adjusting outer cylinder 110. When the button 130 is in a pressed state, the inner cylinder portion abuts against the driving inner cylinder 120, and the outer cylinder portion abuts against the adjusting outer cylinder 110. An installation space 116 is provided at the end of the adjusting outer cylinder 110 away from the medicine bottle assembly 500, combined with Figure 11 A sliding protrusion 132 is provided on the outer wall of the outer cylinder, and the sliding protrusion 132 is slidably set in the installation space 116, and a first limiting protrusion 114 is provided at the end of the installation space 116 to limit the sliding protrusion 132 in the installation space 116, so that the position switching of the button 130 between the released state and the pressed state can be realized, and the button 130 can be prevented from being separated from the adjustment outer cylinder 110.

[0070] Furthermore, a second limiting protrusion 131 is provided on the outer wall of the outer cylinder portion. The second limiting protrusion 131 is provided outside the installation space 116, and when the button 130 is in a pressed state, the second limiting protrusion 131 abuts against the first limiting protrusion 114, thereby preventing the button 130 from being embedded in the installation space 116 as a whole and unable to be removed.

[0071] Combine Figure 5 In order to ensure reliable sound prompting, there are at least two bidirectional ratchets 121 arranged at equal intervals around the central axis of the adjustment outer cylinder 110.

[0072] The injection pen disclosed in the embodiments of this application includes a housing assembly 200, an injection mechanism 300, and the aforementioned injection dose adjustment mechanism 100. The injection dose adjustment mechanism 100 is threadedly engaged with the housing assembly 200, and the driving inner cylinder 120 is coaxially arranged and transmission-connected with the injection mechanism 300. Due to the inclusion of the aforementioned injection dose adjustment mechanism 100, the pen also possesses the aforementioned structure and beneficial effects. Other structural features are referenced to the prior art and will not be further described here.

[0073] Combine Figure 4The pen housing assembly 200 includes an upper pen housing 210 and a bottle holder 220. The injection mechanism 300 and the injection dose adjustment mechanism 100 are both arranged on the upper pen housing 210. The bottle holder 220 is connected to the upper pen housing 210. The bottle holder 220 is mainly used to install the medicine bottle assembly 500. Figure 3 The pen housing assembly 200 may further include a pen cap 230, which may protect the medicine bottle assembly 500 inside. Figure 4 and Figure 8 The injection dose adjustment mechanism 100 is threadedly engaged with the upper pen shell 210. A second external thread 113 is provided on the outer wall of the adjustment outer cylinder 110, and a second internal thread is provided on the inner wall of the upper pen shell 210. The second external thread 113 and the second internal thread are threadedly engaged. By rotating the adjustment outer cylinder 110, the adjustment outer cylinder 110 can realize axial movement relative to the upper pen shell 210.

[0074] There is a scale on the outer wall of the outer cylinder 110. Figure 2 A dosage window 211 is provided on the upper pen shell 210 . The dosage window 211 is used for the operator to observe and adjust the scale on the outer tube 110 during the dosage adjustment process, thereby achieving accurate dosage adjustment of the liquid medicine.

[0075] The injection mechanism 300 injects the liquid medicine by moving toward the medicine bottle assembly 500. In order to prevent the injection mechanism 300 from moving in the opposite direction, in some embodiments, the injection mechanism 300 is combined with the medicine bottle assembly 500 to inject the liquid medicine. Figure 4 The injection mechanism 300 includes a push screw 310 and a bottle cap holder 320. The push screw 310 is threadedly engaged with the bottle cap holder 320 and is transmission-connected to the driving inner cylinder 120. The bottle cap holder 320 is arranged in the pen housing assembly 200 and is provided with a one-way locking groove. The injection pen also includes a locking push rod 400. The locking push rod 400 is arranged between the driving inner cylinder 120 and the push screw 310. The locking push rod 400, the driving inner cylinder 120 and the push screw 310 are coaxially arranged and can rotate together. The driving inner cylinder 120 and the push screw 310 can both move axially relative to the locking push rod 400. A one-way locking ratchet 402 that cooperates with the one-way locking groove is provided on the locking push rod 400. The cooperation between the one-way locking ratchet 402 and the one-way locking groove can ensure that the push screw 310 can only rotate in one direction, and the push screw 310 moves in the direction of pushing the liquid medicine, but cannot move in the opposite direction.

[0076] Combine Figure 4 A screw washer 330 is disposed at the end of the push screw 310 away from the button 130. This washer 330 moves with the push screw 310 and can push the stopper 520 of the vial assembly 500 relative to the vial 510, thereby enabling drug injection. It should be noted that the vial assembly 500 is a container for storing medication and is not part of the injection pen itself, but can be used in conjunction with the pen.

[0077] In other embodiments, the locking push rod 400 may not be provided, and the medicine bottle assembly 500 is provided as a replaceable structure, so as to facilitate multiple uses of the injection pen by replacing the medicine bottle assembly 500.

[0078] Combine Figure 10 and Figure 13 A guide groove 401 is provided on the locking push rod 400, and the guide groove 401 extends along the axial direction of the locking push rod 400. A guide protrusion 124 is provided on the driving inner cylinder 120, and the guide protrusion 124 can slide along the guide groove 401. During the dose adjustment process, under the cooperation of the guide groove 401 and the guide protrusion 124, the driving inner cylinder 120 can only move along the axial direction of the locking push rod 400, and the positions of the locking push rod 400 and the pushing screw 310 remain fixed.

[0079] Combine Figure 9 and Figure 13 The driving inner cylinder 120 is provided with a first inner hole 123 axially therethrough, and the first inner hole 123 is a transmission hole with a non-circular cross-section. The locking push rod 400 passes through the first inner hole 123, and the shape of the locking push rod 400 is adapted to the cross-sectional shape of the first inner hole 123; the locking push rod 400 is provided with a second inner hole 403 axially therethrough, and the second inner hole 403 is a transmission hole with a non-circular cross-section. The pushing screw 310 passes through the second inner hole 403, and the shape of the pushing screw 310 is adapted to the cross-sectional shape of the second inner hole 403, so that the rotation of the driving inner cylinder 120 can drive the locking push rod 400 to rotate synchronously, and the rotation of the locking push rod 400 can drive the pushing screw 310 to rotate synchronously, and the rotation of the pushing screw 310 is converted into axial movement of the pushing screw 310 under the cooperation with the thread of the bottle cap rack 320, thereby realizing the pushing of the liquid medicine. The embodiment of the present application does not limit the specific shapes of the first inner hole 123 and the second inner hole 403. For example, Figure 9 and Figure 13 , which respectively show a technical solution in which the cross sections of the first inner hole 123 and the second inner hole 403 each include two parallel line segments arranged oppositely and two arc line segments arranged oppositely.

[0080] In a specific use process of the injection pen disclosed in the present application, when setting the dose, the button 130 is in the released state, and the outer cylinder 110 and the driving inner cylinder 120 are in the rotationally separated state. At this time, the operator can adjust the outer cylinder 110 to rotate relative to the pen housing assembly 200; specifically, the outer cylinder 110 is rotated clockwise to confirm the required injection dose through the digital scale at the dose window 211. The outer cylinder 110 and the driving inner cylinder 120 realize the sound prompt when the outer cylinder 110 is rotated clockwise through the ratchet spring; at the same time, the outer cylinder 110 drives the rotary The rotating wheel 140 rotates, and the set dose of the current injection is memorized by the axial movement of the rotating wheel 140 relative to the inner cylinder 120. If it is found that the set dose displayed is greater than the current requirement, the outer cylinder 110 is rotated counterclockwise to adjust, and the digital scale indicated by the dose window 211 is observed to confirm that the dose is adjusted back to the required set dose. At this time, the bidirectional ratchet 121 is used to realize the sound prompt when the outer cylinder 110 is rotated counterclockwise. At the same time, the outer cylinder 110 is adjusted to drive the rotating wheel 140 to rotate in the opposite direction, and the excess dose setting is subtracted by the axial movement of the rotating wheel 140 relative to the inner cylinder 120.

[0081] During the injection process, the button 130 is first pressed, causing the adjustment outer cylinder 110 and the driving inner cylinder 120 to change from a rotationally separated state to a rotationally coupled state. At this time, the axial pressing force continuously applied to the button 130 drives the adjustment outer cylinder 110, the driving inner cylinder 120, and the push screw 310 to rotate synchronously, and the rotation of the push screw 310 can realize the movement of the screw gasket 330 toward the medicine bottle 510, thereby realizing the function of injecting the liquid medicine or exhausting the gasket. After multiple injections, the filling liquid in the medicine bottle 510 is completely injected, and the axial movement stroke of the rotating wheel 140 on the driving inner cylinder 120 is completed. The adjustment outer cylinder 110 is locked with the driving inner cylinder 120 by the rotating wheel 140 and cannot rotate relative to each other. In this state, the dose cannot be set and the injection cannot be performed.

[0082] The terms "first" and "second" and the like in the specification and claims of this application are used to distinguish different objects, rather than to describe a specific order, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not set to the listed steps or units, but may include steps or units that are not listed. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0083] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and, while certain embodiments according to the principles of the application are shown and described specific details of various embodiments to provide an understanding of the principles of the application, the application is not limited to the embodiments disclosed but is to be accorded the full scope consistent with the principles and novel features disclosed herein. Particular sequential arrangements of specific embodiments, unless otherwise specified can not be required, and thus some of the embodiments can be performed in an order other than that shown or described. Certain of the embodiments are presented in terms of methods that can be implemented as instructions processed by a machine, and can be implemented as hardware, firmware, software, or any combination thereof. In the context of software, the terms "stored" or "data store" mean that the data is available for processing by a machine, and can be loaded in memory for execution by a machine. The machine can be any suitable processing platform, including, but not limited to, a general purpose computer, a special purpose computer, a microprocessor, a microprocessor core that can or can not be supplemented by a microprocessor or microprocessor cores, or any other processing unit. Further, software referred to in this detailed description can be stored in a computer readable medium, which can be any medium that can be read and accessed by a machine. Such computer readable medium can include, but is not limited to, optical

Claims

1. An injection dose adjustment mechanism, characterized in that: include: An adjusting outer cylinder (110), the adjusting outer cylinder (110) being used for threaded engagement with the pen housing assembly (200), and a plurality of ratchet grooves (111) being provided on an inner wall of one end of the adjusting outer cylinder (110), the ratchet grooves (111) being continuously arranged around the central axis of the adjusting outer cylinder (110); A driving inner cylinder (120), the driving inner cylinder (120) being arranged in the regulating outer cylinder (110) and being coaxially arranged with the regulating outer cylinder (110), and a bidirectional ratchet (121) being provided at one end of the driving inner cylinder (120), ratchet springs being embedded in the ratchet groove (111) being provided at both ends of the bidirectional ratchet (121), and the driving inner cylinder (120) and the bidirectional ratchet (121) being an integrated structure, the driving inner cylinder (120) being used for transmission connection with the injection mechanism (300), and the forward or reverse rotation of the regulating outer cylinder (110) driving the ratchet springs of the bidirectional ratchet (121) to collide with the ratchet groove (111) to produce a sound; The regulating outer cylinder (110) is provided with a first step surface (117), and the driving inner cylinder (120) is provided with a second step surface (126). Along the axial direction of the regulating outer cylinder (110), the first step surface (117) and the second step surface (126) are arranged facing each other, and the first step surface (117) is provided with a first transmission part (112), and the second step surface (126) is provided with a second transmission part (125); when the first transmission part (112) and the second step surface (126) are When the second transmission part (125) is disconnected from the transmission, the regulating outer cylinder (110) and the driving inner cylinder (120) are in a rotationally separated state, and the forward or reverse rotation of the regulating outer cylinder (110) drives the ratchet spring of the bidirectional ratchet (121) to collide with the ratchet groove (111) and produce a sound; when the first transmission part (112) and the second transmission part (125) are connected in transmission, the regulating outer cylinder (110) and the driving inner cylinder (120) are in a rotationally coupled state and can rotate synchronously; The first transmission part (112) includes a transmission protrusion protruding in the direction of the second step surface (126), and the second transmission part (125) includes a transmission groove for the transmission protrusion to be embedded; or the second transmission part (125) includes a transmission protrusion protruding in the direction of the first step surface (117), and the first transmission part (112) includes a transmission groove for the transmission protrusion to be embedded; the transmission protrusion has two first side walls arranged at an angle, and the first side walls are arranged at an angle to the axial direction of the adjustment outer cylinder (110); the transmission protrusion has two second side walls arranged at an angle, and the second side walls are arranged at an angle to the axial direction of the adjustment outer cylinder (110); when the first transmission part (112) and the second transmission part (125) are in transmission connection, the second side walls abut against the first side walls; A rotating wheel (140) is provided between the regulating outer cylinder (110) and the driving inner cylinder (120); An axial slide groove (141) and an axial guide rail (115) are respectively provided on the side walls facing each other of the rotating wheel (140) and the adjusting outer cylinder (110); the axial slide groove (141) passes through the axial direction of the rotating wheel (140); the axial guide rail (115) extends along the axial direction of the adjusting outer cylinder (110); the axial slide groove (141) and the axial guide rail (115) are embedded and slidably matched; a first external thread (122) is provided on the outer wall of the driving inner cylinder (120); and a first internal thread (142) threadably matched with the first external thread (122) is provided on the inner wall of the rotating wheel (140); It also includes a button (130), which is movably arranged on the regulating outer cylinder (110) and is used to switch the regulating outer cylinder (110) and the driving inner cylinder (120) from a rotationally separated state to a rotationally coupled state.

2. The injection dose adjustment mechanism according to claim 1, wherein: The transmission grooves are a plurality of grooves continuously arranged around the central axis of the regulating outer cylinder (110); The number of the transmission protrusions is less than or equal to the number of the transmission grooves, and the transmission protrusions are arranged at equal intervals or continuously around the central axis of the regulating outer cylinder (110).

3. The injection dose adjustment mechanism according to claim 1, wherein: The button (130) comprises an outer cylinder portion and an inner cylinder portion that are coaxially arranged and connected, the inner cylinder portion being arranged inside the outer cylinder portion, and when the button (130) is in a pressed state, the inner cylinder portion abuts against the driving inner cylinder (120), and the outer cylinder portion abuts against the regulating outer cylinder (110); An installation space (116) is provided on the adjusting outer cylinder (110), a sliding protrusion (132) is provided on the outer wall of the outer cylinder portion, the sliding protrusion (132) is slidably provided in the installation space (116), and a first limiting protrusion (114) is provided at the end of the installation space (116) for limiting the sliding protrusion (132) in the installation space (116).

4. The injection dose adjustment mechanism according to claim 3, wherein: A second limiting protrusion (131) is provided on the outer wall of the outer cylinder portion. The second limiting protrusion (131) is provided outside the installation space (116), and when the button (130) is in a pressed state, the second limiting protrusion (131) abuts against the first limiting protrusion (114).

5. The injection dose adjustment mechanism according to claim 1 or 2, characterized in that: The bidirectional ratchet teeth (121) are at least two arranged at equal intervals around the central axis of the regulating outer cylinder (110).

6. An injection pen, characterized in that: include: Pen housing assembly (200); An injection mechanism (300) is provided on the pen housing assembly (200); The injection dose adjustment mechanism (100) according to any one of claims 1 to 5, wherein the injection dose adjustment mechanism (100) is threadedly engaged with the pen housing assembly (200), and the driving inner cylinder (120) is transmission-connected to the injection mechanism (300).

7. The injection pen according to claim 6, wherein: The injection mechanism (300) comprises a pushing screw (310) and a bottle cap frame (320), wherein the pushing screw (310) is threadably engaged with the bottle cap frame (320) and is transmission-connected to the driving inner cylinder (120), and the bottle cap frame (320) is disposed in the pen housing assembly (200), and a one-way locking groove is provided on the bottle cap frame (320); The invention also includes a locking push rod (400), which is arranged between the driving inner cylinder (120) and the pushing screw (310). The locking push rod (400), the driving inner cylinder (120) and the pushing screw (310) are coaxially arranged and can rotate together, and the driving inner cylinder (120) and the pushing screw (310) can both slide axially relative to the locking push rod (400). The locking push rod (400) is provided with a one-way locking ratchet (402) that cooperates with the one-way locking groove.

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