Driving assembly of automatic injection device and automatic injection device

Abstract

The utility model relates to the field of medical instruments, and particularly discloses a driving assembly of an automatic injection device and the automatic injection device. The release sleeve comprises a sleeve body, a sliding part and a limiting part, one end of the sliding part is connected with the sleeve body, and the other end is connected with the limiting part; the guide pipe comprises a pipe wall and a sliding groove formed in the pipe wall. The sliding groove penetrates through the guide pipe in the direction from the pipe wall to the axis of the guide pipe. The sliding groove comprises a mounting part and a releasing part, the mounting part is used for allowing the limiting piece to penetrate through and enabling the limiting piece to be located on the side close to the inner wall of the guide pipe, the sleeve body is located on the side close to the outer wall of the guide pipe, and at least part of the sliding piece is located in the mounting part; the release part is communicated with the mounting part, so that the sliding piece slides between the mounting part and the release part; the release part is used for stopping the limiting piece from penetrating and preventing the sliding piece from turning outwards, so that the reliability of smooth injection is improved; and the probability that the needle head is exposed again after injection is completed is reduced.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, and particularly relates to a driving component of an automatic injection device and the automatic injection device. Background Art

[0002] An automatic injection device is used to inject a liquid medicine into the body of a person receiving an injection. The automatic injection device includes a housing assembly, a driving component, and a syringe assembly for containing the liquid medicine. The driving component and the syringe assembly are coaxially nested inside the housing assembly, and the syringe assembly is located on the side of the housing assembly close to the body of the person receiving the injection, while the driving component is located on the side of the housing assembly away from the body of the person receiving the injection. One end of the syringe assembly is provided with an injection needle, and the other end is provided with a piston. The driving component provides a driving force for the piston, and the piston extrudes the liquid medicine, which is injected into the human body through the injection needle to complete the injection operation of the automatic injection device.

[0003] However, the unreasonable configuration of the driving component of the existing automatic injection device will cause the interruption of the injection process, affect the continuity of use, and even cause the failure of the injection device and the inability to complete the injection; or, after the injection is completed, the driving component cannot be reset, resulting in the inability to retract the needle, endangering the personal safety of the operator. Summary of the Utility Model

[0004] The present application provides a driving component of an automatic injection device and the automatic injection device. The driving component is provided with a limiting member connected to a sliding member of a release sleeve. By limiting the radial movement of the sliding member through the limiting member, it can prevent the sliding member from turning outwards when sliding along the sliding groove, improving the reliability of the smooth progress of the injection process; and ensuring that the release sleeve can be reset after the injection is completed and the needle is retracted into the automatic injection device, avoiding the re-exposure of the needle or reducing the probability of the re-exposure of the needle.

[0005] To solve the above technical problems, a technical solution adopted by the present application is: to provide a driving component of an automatic injection device and the automatic injection device. The driving component includes a release sleeve and a guide tube; the release sleeve includes a sleeve body, a sliding member, and a limiting member. One end of the sliding member is connected to the sleeve body, and the other end is connected to the limiting member; the guide tube includes a tube wall and a sliding groove provided on the tube wall; in the direction from the tube wall towards the axis of the guide tube, the sliding groove penetrates through the guide tube; the sliding groove includes a mounting portion and a release portion. The mounting portion is for the limiting member to pass through and makes the limiting member located on the side close to the inner wall of the guide tube, and the sleeve body is located on the side close to the outer wall of the guide tube. At least a part of the sliding member is located in the mounting portion; the release portion is communicated with the mounting portion, so that the sliding member slides between the mounting portion and the release portion; the release portion is used to block the passing of the limiting member.

[0006] Wherein, in the circumferential direction, the width of the mounting portion is greater than the width of the release portion.

[0007] Among them, the sliding groove includes a transition portion located between the installation portion and the release portion; in the direction from the installation portion to the release portion, the width of the transition portion gradually decreases.

[0008] Among them, the transition portion includes a first side and a second side in the circumferential direction. The shape of the first side is arc-shaped, so that the installation portion and the release portion are in a streamlined transition.

[0009] Among them, the second side is in a straight line with the sides of the installation portion and the release portion.

[0010] Among them, the length of the release portion is greater than or equal to the maximum distance that the release sleeve can move relative to the guide tube.

[0011] Among them, the sleeve body includes a cylinder body and an extension arm. The extension arm is arranged at one end of the cylinder body. The inner wall of the extension arm is connected with a sliding member, and the sliding member extends in the axial direction of the guide tube.

[0012] Among them, the number of extension arms is two, and the two extension arms are arranged on opposite sides of the guide tube; the number of sliding members and limit members is also two respectively, and one sliding member and one limit member are arranged on one extension arm.

[0013] Among them, in the direction of the sleeve body pointing to the axis, the difference between the height of the sliding member and the thickness of the tube wall around the sliding groove is less than or equal to a preset value, so that when the sliding member slides in the sliding groove, the limit member abuts against the inner wall of the guide tube.

[0014] Among them, the limit member is located on one side or both sides of the plane where the sliding member is located.

[0015] Among them, the limit member is arc-shaped and extends circumferentially along the guide tube.

[0016] Among them, the width of the limit member in the circumferential direction is greater than the width of the release portion.

[0017] Among them, the sliding member, the limit member and the sleeve body are integrally formed.

[0018] Among them, the driving assembly further includes an elastic member, a bottom cover and a push rod; the guide tube is sleeved on the outer periphery of the push rod, and one end of the guide tube is fixed on the bottom cover; the push rod is coaxially arranged with the bottom cover, and the push rod is arranged inside the guide tube; the elastic member is sleeved on the outer periphery of the release sleeve, one end of the elastic member abuts against the bottom cover, and the other end abuts against the release sleeve.

[0019] Among them, the sliding member abuts against the proximal end of the sliding groove. When the sliding member slides along the sliding groove to the distal end, the push rod moves axially along the proximal end relative to the guide tube.

[0020] This application also includes a second technical solution, which provides an automatic injection device including the above-mentioned driving assembly.

[0021] The beneficial effects of this application are as follows: Different from the prior art, the driving component and the automatic injection device of the automatic injection device provided by this application, the driving component includes a release sleeve and a guide tube; the release sleeve includes a sleeve body, a sliding member and a limiting member, one end of the sliding member is connected to the sleeve body, and the other end is connected to the limiting member. The guide tube includes a tube wall and a sliding groove provided on the tube wall. In the direction from the tube wall towards the axis of the guide tube, the sliding groove penetrates through the guide tube. Specifically, the release sleeve is sleeved on the outer periphery of the guide tube, the sliding member passes through the sliding groove, and can slide along the axis direction of the sliding groove; when the sliding member slides along the sliding groove away from the human body, the driving component is started; when the sliding member slides along the sliding groove towards the human body, the release sleeve is reset. The limiting member is located on the side where the inner wall of the guide tube is located, and can limit the radial movement of the sliding member, thereby preventing the sliding member from turning outwards when sliding along the sliding groove, thereby improving the reliability of the smooth progress of the injection process; and, the release sleeve can be reset after the injection is completed and retract the needle into the automatic injection device, avoiding the needle from being exposed again or reducing the probability of the needle being exposed again. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, among which:

[0023] Figure 1 is a schematic structural diagram of an embodiment of the driving component of the present application;

[0024] Figure 2 is the Figure 1 A-A cross-sectional structural diagram of the embodiment of the present application;

[0025] Figure 3 is a schematic structural diagram of the release sleeve of an embodiment of the driving component of the present application;

[0026] Figure 4 is the Figure 3 structural diagram of another perspective of the embodiment of the present application;

[0027] Figure 5 is a schematic structural diagram of the guide tube of an embodiment of the driving component of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the specific embodiments of the present application in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only for explaining the present application and not for limiting the present application. Additionally, it should be noted that for the convenience of description, only the parts related to the present application rather than all the structures are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0029] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the present application, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0031] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", and "coupled" should be construed in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of an embodiment of the drive assembly of the present application, Figure 2 is of the present application Figure 1Schematic diagram of the A-A cross-sectional structure of the embodiment. In one aspect of the present application, a driving assembly 100 is provided, and the driving assembly 100 includes a release sleeve 1 and a guide tube 2. The release sleeve 1 includes a sleeve body 13, a sliding member 12, and a limiting member 11. The sliding member 12 is used to start the driving assembly 100, and the limiting member 11 is used to limit the radial movement of the sliding member 12 to improve the stability of the injection process. One end of the sliding member 12 is connected to the sleeve body 13, and the other end is connected to the limiting member 11. The guide tube 2 includes a tube wall and a sliding groove 21 provided on the tube wall. The sliding groove 21 penetrates the guide tube 2 in the direction from the tube wall towards the axis of the guide tube 2. Specifically, the release sleeve 1 is sleeved on the outer periphery of the guide tube 2, and the sliding member 12 passes through the sliding groove 21 and can slide along the axis direction of the sliding groove 21; when the sliding member 12 slides along the sliding groove 21 away from the human body, the driving assembly 100 is started; when the sliding member 12 slides along the sliding groove 21 towards the human body, the release sleeve 1 is reset. The limiting member 11 is located on the side where the inner wall of the guide tube 2 is located, and can limit the radial movement of the sliding member 12, thereby preventing the sliding member 12 from turning outwards when sliding along the sliding groove 21, thus improving the reliability of the smooth progress of the injection process, and the release sleeve 1 can be reset after the injection is completed and the needle is retracted, avoiding the needle from being exposed again or reducing the probability of the needle being exposed again.

[0033] Specifically, since the release sleeve 1 is sleeved on the outer periphery of the guide tube 2, when the release sleeve 1 moves relative to the guide tube 2, the sliding member 12 is driven to move in the axial direction. The sliding groove 21 is arranged to extend in the axial direction, which can facilitate the sliding of the sliding member 12 and improve the smoothness and stability of the sliding.

[0034] Please refer to Figure 5 , Figure 5 , which is a schematic diagram of the structure of the guide tube of an embodiment of the driving assembly of the present application. Further, the sliding groove 21 includes a mounting portion 211 and a release portion 212. The mounting portion 211 is used for the limiting member 11 to pass through, and makes the limiting member 11 located on the side close to the inner wall of the guide tube 2, the sleeve body is located on the side close to the outer wall of the guide tube 2, and at least a part of the sliding member 12 is located in the mounting portion 211. The release portion 212 is communicated with the mounting portion 211, so that the sliding member 12 slides between the mounting portion 211 and the release portion 212. The release portion 212 is used to block the passing of the limiting member 11.

[0035] Specifically, the installation part 211 is located at the distal end, and the release part 212 is located at the proximal end. The installation part 211 is used to install the limiting part 11 and the sliding part 12. The release part 212 is used for the sliding part 12 to slide to activate the driving component 100 and ensure the reset of the protection sleeve. During installation, the sleeve body 13 is sleeved on the outer wall of the guide tube 2. The sliding part 12 and the limiting part 11 pass through the installation part 211 and slide from the installation part 211 to the release part 212 to realize the fitting connection between the release sleeve 1 and the guide tube 2. Further, during use, the sliding range of the sliding part 12 is only within the release part 212. By blocking the limiting part 11 from passing through, radial limitation of the sliding part 12 is achieved, thereby preventing the sliding part 12 from turning outwards when sliding along the release part 212 and affecting the elastic performance of the elastic part 3. After injection is completed, the release sleeve 1 can be reset under the action of the elastic part 3, thereby pushing the protection sleeve of the automatic injection device to reset and protecting and accommodating the needle, avoiding the needle from being exposed again or reducing the probability of the needle being exposed again.

[0036] Further, the driving component 100 further includes an elastic part 3, a bottom cover 4 and a push rod 5. The guide tube 2 is sleeved on the outer periphery of the push rod 5, and one end of the guide tube 2 is fixed on the bottom cover 4. The push rod 5 is coaxially arranged with the bottom cover 4, and the push rod 5 is arranged inside the guide tube 2. The elastic part 3 is sleeved on the outer periphery of the release sleeve 1. One end of the elastic part 3 abuts against the bottom cover 4, and the other end abuts against the release sleeve 1.

[0037] The bottom cover 4 is used to fix the guide tube 2 and limit the axial and circumferential movement of the guide tube 2. The elastic part 3 is used to push the release sleeve 1 to reset after injection is completed. The push rod 5 is used to push the piston for liquid medicine injection. A fixing rod is further provided on the bottom cover 4. The fixing rod is coaxially arranged with the push rod 5. A spring is arranged between the fixing rod and the push rod 5. The spring is sleeved on the outer periphery of the fixing rod. Through the limitation of the push rod 5 and the fixing rod, the spring can only move along the axial direction. In the initial state, the spring is in a compressed state, and the two ends of the spring respectively abut against the bottom cover 4 and the push rod 5. The part of the sliding part 12 passing through the sliding groove 21 abuts against the push rod 5 to limit the axial movement of the push rod 5.

[0038] Further, in the initial state, the sliding part 12 abuts against the proximal end of the sliding groove 21, and a force balance is formed without external force, which can prevent accidental triggering due to the sliding of the sliding part 12 along the sliding groove 21 in the initial state. It should be noted that the proximal end here refers to the end of the automatic injection device close to the human body during injection, and the opposite end is the distal end.

[0039] When the slider 12 slides distally along the sliding groove 21, the push rod 5 moves axially proximally relative to the guide tube 2 to push the piston for injection. Specifically, when starting the injection, the release sleeve 1 is subjected to an external force and moves distally along the axis from the proximal end, compressing the elastic member 3. At the same time, it drives the slider 12 to slide distally along the sliding groove 21, separating the slider 12 from the push rod 5. The push rod 5 moves axially proximally along the inner wall of the guide tube 2 under the action of the spring, starting the drive assembly 100. The push rod 5 pushes the piston proximally to drive the injection assembly for injection. After the injection is completed, the release sleeve 1 loses the external force and moves proximally from the distal end under the action of the elastic member 3 to complete the reset.

[0040] During the above process, the drive assembly 100 of the embodiment of the present application can limit the radial movement of the slider 12 through the limiting member 11, improving or avoiding the situation that the slider 12 turns outwards or even gets involved in the elastic member 3 when sliding along the sliding groove 21, resulting in a reduction in the performance of the elastic member 3 and the release sleeve 1 being unable to reset, thereby improving the reliability of the smooth progress of the injection process; and ensuring that the release sleeve 1 can reset after the injection is completed and retract the needle into the automatic injection device, avoiding the needle being exposed again or reducing the probability of the needle being exposed again.

[0041] Further, the automatic injection device is provided with a protective sleeve for protecting components such as the needle. The protective sleeve abuts against the release sleeve 1. When starting the injection, the protective sleeve pushes the release sleeve 1 to move distally from the proximal end, exposing the needle, and at the same time starting the drive assembly 100 of the release sleeve 1. After the injection is completed, the release sleeve 1 pushes the protective sleeve to move proximally from the distal end to complete the reset, so that the needle is accommodated in the protective sleeve, reducing the probability of the needle being exposed again.

[0042] In an embodiment of the present application, in the circumferential direction, the width of the installation portion 211 is greater than the width of the release portion 212.

[0043] Specifically, the width of the installation portion 211 is greater than the width of the release portion 212 to facilitate the installation and disassembly of the limiting member 11 and also avoid the limiting member 11 detaching from the release portion 212. When the slider 12 slides in the release portion 212, the limiting member 11 is located on the side close to the inner wall of the guide tube 2; when the slider 12 slides in the installation portion 211, the limiting member 11 can detach from the side of the inner wall of the guide tube 2.

[0044] In an embodiment of the present application, the sliding groove 21 includes a transition portion 213 located between the installation portion 211 and the release portion 212. In the direction from the installation portion 211 to the release portion 212, the width of the transition portion 213 gradually decreases.

[0045] Specifically, in the direction from the installation part 211 to the release part 212, the width of the transition part 213 gradually decreases, facilitating the sliding of the sliding part 12 from the installation part 211 to the release part 212, making the installation and disassembly of the sliding part 12 and the limiting part 11 simple and fast.

[0046] In an embodiment of the present application, the transition part 213 includes a first side 2131 and a second side 2132 in the circumferential direction. The shape of the first side 2131 is arc-shaped, enabling a streamlined transition between the installation part 211 and the release part 212, facilitating the sliding of the sliding part 12, allowing the sliding part 12 to smoothly slide from the installation part 211 to the release part 212, and making the installation and disassembly of the sliding part 12 simple and fast.

[0047] In another embodiment, the first side 2131 can also be stepped to prevent the sliding part 12 from detaching and improve stability.

[0048] In an embodiment of the present application, the second side 2132 is in a straight line with the sides of the installation part 211 and the release part 212.

[0049] Specifically, the second side 2132 is in a straight line with the sides of the installation part 211 and the release part 212 and extends along the axial direction to limit the sliding direction of the sliding part 12, ensuring that the sliding part 12 moves and resets along the axial direction. It can also achieve circumferential limitation of the release sleeve 1, restricting the circumferential movement of the release sleeve 1.

[0050] In an embodiment of the present application, the length of the release part 212 is greater than or equal to the maximum distance that the release sleeve 1 can move relative to the guide tube 2, which can prevent the sliding part 12 from sliding from the release part 212 to the installation part 211 during injection, avoiding the detachment of the sliding part 12 and the limiting part 11. Thus, the sliding part 12 only slides within the range of the release part 212 during the injection process, improving the stability of reset.

[0051] Specifically, the release sleeve 1 moves from the proximal end to the distal end under an external force. Since the two ends of the elastic member 3 respectively abut against the bottom cover 4 and the release sleeve 1, this movement process compresses the elastic member 3 and has a maximum movable distance. The length of the release part 212 along the axial direction can be greater than this maximum distance or equal to the maximum distance, thereby avoiding the sliding part 12 sliding to the installation part 211 and causing the sliding part 12 and the limiting part 11 to detach from the sliding groove 21 and the guide tube 2.

[0052] Please refer to Figure 3 and Figure 4 , Figure 3 which is a schematic structural diagram of the release sleeve of an embodiment of the drive assembly of the present application, Figure 4 is of the present application Figure 3Structural schematic diagram of another perspective of the embodiment. In an embodiment of the present application, the sleeve body 13 includes a cylinder body 131 and an extension arm 132. The extension arm 132 is provided at one end of the cylinder body 131. The inner wall of the extension arm 132 is connected to a sliding member 12, and the sliding member 12 extends in the axial direction of the guide tube 2.

[0053] Specifically, by extending the sliding member 12 and the limiting member 11 into the sliding groove 21 through the extension arm 132, the structure can be simplified, the materials required for manufacturing the release sleeve 1 can be reduced, and thus the production cost can be lowered.

[0054] In an embodiment of the present application, the number of extension arms 132 is two, and the two extension arms 132 are provided on opposite sides of the guide tube 2. The numbers of the sliding member 12 and the limiting member 11 are also two respectively, and one extension arm 132 is provided with one sliding member 12 and one limiting member 11.

[0055] Specifically, two sliding grooves 21 are also provided on the outer wall of the guide tube 2, and the two sliding grooves 21 respectively correspond to the two extension arms 132 one by one. The circumferential movement of the release sleeve 1 can be restricted through the cooperation between the sliding groove 21 and the extension arm 132, further improving the stability.

[0056] In an embodiment of the present application, in the axial direction pointed by the sleeve body 13, the difference between the height of the sliding member 12 and the thickness of the tube wall around the sliding groove 21 is less than or equal to a preset value, so that when the sliding member 12 slides in the sliding groove 21, the limiting member 11 abuts against the inner wall of the guide tube 2. In the implementation manner of the present application, the preset value is a value set artificially, and the preset value can be 0, 0.5 mm, 1 mm, 2 mm, 5 mm, etc. In the implementation manner of the present application, by controlling the difference between the height of the sliding member 12 and the thickness of the tube wall around the sliding groove 21 to be less than or equal to the preset value, on the one hand, the sliding member 12 can slide smoothly along the sliding groove 21, and on the other hand, the limiting member 11 can abut against the inner wall of the guide tube 2, reducing the probability of the sliding member 12 turning outwards when sliding along the sliding groove 21.

[0057] Specifically, in the initial state, the part of the sliding member 12 passing through the sliding groove 21 abuts against the push rod 5 to limit the axial movement of the push rod 5. In the axial direction of the sleeve body 13, the height of the sliding member 12 must be greater than or equal to the thickness of the tube wall around the sliding groove 21. That is to say, during the sliding process of the sliding member 12, it may move in the direction away from the axis of the sleeve body 13 and even be involved in the elastic member 3, thereby reducing the performance of the elastic member 3, causing the release sleeve 1 to stop moving and unable to reset. Therefore, a preset value is set, which is greater than or equal to the distance between the elastic member 3 and the outer wall of the release sleeve 1. When the difference between the height of the sliding member 12 and the thickness of the tube wall around the sliding groove 21 is less than the preset value, the sliding member 12 can be prevented from being involved in the elastic member 3. Further, one end of the sliding member 12 pointing in the axial direction is connected to the limiting member 11. When the sliding member 12 slides in the sliding groove 21, the limiting member 11 abuts against the inner wall member of the guide tube 2, restricting the movement of the sliding member 12 in the direction away from the axis, thereby preventing the sliding member 12 from turning outwards when sliding along the sliding groove 21 and reducing the performance of the elastic member 3, and improving the reliability of the smooth progress of the injection process; and, the release sleeve 1 can reset after the injection is completed and retract the needle into the automatic injection device, avoiding the needle being exposed again or reducing the probability of the needle being exposed again.

[0058] In one embodiment of the present application, the limiting member 11 can be located on one side of the plane where the sliding member 12 is located to simplify the structure and reduce the cost. In another embodiment, the limiting member 11 can also be located on both sides of the plane where the sliding member 12 is located to improve the stability.

[0059] In one embodiment of the present application, the limiting member 11 is arc-shaped and the limiting member 11 extends along the circumferential direction of the guide tube 2.

[0060] Specifically, the limiting member 11 extends along the circumferential direction of the guide tube 2 to facilitate abutting against the inner wall of the guide tube 2. When the sliding member 12 slides, the arc-shaped limiting member 11 can also facilitate sliding along the inner wall of the guide tube 2. In another embodiment, the limiting member 11 can also extend in other directions to abut against the inner wall of the guide tube 2 when the sliding member 12 moves outwards from the release portion 212, avoiding the sliding member 12 detaching from the sliding groove 21 and turning outwards to be involved in the elastic member 3. After the injection is completed, the release sleeve 1 can reset under the action of the elastic member 3, thereby pushing the protection sleeve to reset, avoiding the needle being exposed again or reducing the probability of the needle being exposed again.

[0061] In one embodiment of the present application, the width of the limiting member 11 in the circumferential direction is greater than the width of the release portion 212, so that the limiting member 11 can abut against the tube wall around the release portion 212 when the sliding member 12 moves in the direction away from the axis of the guide tube, realizing that the release portion 212 blocks the limiting member 11 from passing through.

[0062] In another embodiment of the present application, different from the above embodiment, the sliding member 12, the limiting member 11 and the sleeve body 13 are integrally formed.

[0063] Specifically, by integrally forming the sliding member 12, the limiting member 11 and the sleeve body 13, the strength of the structure can be improved, the stability can be enhanced, the structure can be simplified, and the cost can be reduced.

[0064] On the other hand, the present application also provides an automatic injection device, which includes the above-mentioned driving assembly 100. Specifically, since the automatic injection device includes the driving assembly 100 described in the above embodiment, it also has the beneficial effects of the above-mentioned driving assembly 100, which will not be elaborated here.

[0065] It should be noted that terms such as "horizontal" and "vertical" do not require the components to be absolutely horizontal or vertical, but can be slightly inclined; terms such as "parallel" and "perpendicular" do not mean that the fittings are absolutely parallel or perpendicular to each other, but can form a certain angular deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In addition, terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the products of the present application are usually placed during use. They are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application.

[0066] It can be understood that the meaning of "a plurality of" herein is at least two, such as two, three, etc., unless there are specific restrictive descriptions. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices. The term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0067] The above are only the embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A drive assembly for an automatic injection device, characterized in that: include: A release sleeve (1), the release sleeve (1) comprising a sleeve body (13), a sliding member (12) and a stopper (11), one end of the sliding member (12) being connected to the sleeve body (13), and the other end of the sliding member (12) being connected to the stopper (11); A guide tube (2), the guide tube (2) comprising a tube wall and a sliding groove (21) arranged on the tube wall; the sliding groove (21) penetrates the guide tube (2) in the direction from the tube wall toward the axis of the guide tube (2); the sliding groove (21) comprises a mounting portion (211) and a releasing portion (212); the mounting portion (211) is used for the limiting member (11) to pass through, and enables the limiting member (11) to be located on the side close to the inner wall of the guide tube (2), the sleeve body is located on the side close to the outer wall of the guide tube (2), and the sliding member (12) is at least partially located in the mounting portion (211); the releasing portion (212) is communicated with the mounting portion (211), so that the sliding member (12) slides between the mounting portion (211) and the releasing portion (212); the releasing portion (212) is used to prevent the limiting member (11) from passing through.

2. The drive assembly according to claim 1, characterized in that: In the circumferential direction, the width of the mounting portion (211) is greater than the width of the releasing portion (212).

3. The drive assembly according to claim 2, characterized in that: The sliding groove (21) comprises a transition portion (213), wherein the transition portion (213) is located between the mounting portion (211) and the release portion (212); and the width of the transition portion (213) gradually decreases in a direction from the mounting portion (211) to the release portion (212).

4. The drive assembly according to claim 3, characterized in that: The transition portion (213) comprises a first side edge (2131) and a second side edge (2132) in the circumferential direction, and the first side edge (2131) is in an arc shape, so that the mounting portion (211) and the release portion (212) are in a streamlined transition.

5. The drive assembly according to claim 4, characterized in that: The second side edge (2132) is in a straight line with the side edges of the mounting portion (211) and the releasing portion (212).

6. The drive assembly according to claim 1, characterized in that: The length of the release portion (212) is greater than or equal to the maximum distance that the release sleeve (1) can move relative to the guide tube (2).

7. The drive assembly according to claim 1, characterized in that: The sleeve body (13) comprises: The cylinder (131), An extension arm (132) is arranged at one end of the cylinder (131), the inner wall of the extension arm (132) is connected to the sliding member (12), and the sliding member (12) extends toward the axial direction of the guide tube (2).

8. The drive assembly according to claim 7, characterized in that: The number of the extension arms (132) is two, and the two extension arms (132) are arranged on opposite sides of the guide tube (2); The number of the sliding member (12) and the number of the limiting member (11) are also two respectively, and one of the extending arms (132) is provided with one sliding member (12) and one of the limiting members (11).

9. The drive assembly according to claim 1 or 7, characterized in that: In the axial direction of the sleeve body (13), the difference between the height of the sliding member (12) and the thickness of the tube wall around the sliding groove (21) is less than or equal to a preset value, so that when the sliding member (12) slides in the sliding groove (21), the limiting member (11) abuts against the inner wall of the guide tube (2).

10. The drive assembly according to claim 1, characterized in that The limiting member (11) is located on one side or both sides of the plane where the sliding member (12) is located.

11. The drive assembly according to claim 1, characterized in that: The limiting member (11) is arc-shaped, and the limiting member (11) extends along the circumference of the guide tube (2).

12. The drive assembly according to claim 1, characterized in that The width of the limiting member (11) in the circumferential direction is greater than the width of the releasing portion (212).

13. The drive assembly according to any one of claims 1-2, 4-8, 10-12, characterized in that: The sliding member (12), the limiting member (11) and the sleeve body (13) are integrally formed.

14. The drive assembly according to claim 1, characterized in that The driving assembly further comprises an elastic member (3), a bottom cover (4) and a push rod (5); The guide tube (2) is sleeved on the outer circumference of the push rod (5), and one end of the guide tube (2) is fixed on the bottom cover (4); The push rod (5) is coaxially arranged with the bottom cover (4), and the push rod (5) is arranged in the guide tube (2); The elastic member (3) is sleeved on the outer circumference of the release sleeve (1); one end of the elastic member (3) abuts against the bottom cover (4), and the other end abuts against the release sleeve (1).

15. The drive assembly according to claim 14, characterized in that The sliding member (12) abuts against the proximal end of the sliding groove (21), and when the sliding member (12) slides toward the distal end along the sliding groove (21), the push rod (5) moves axially along the proximal end relative to the guide tube (2).

16. An automatic injection device, characterized in that: A drive assembly comprising any one of claims 1-15.

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