Guide pipe assembly and 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 guide pipe assembly of an automatic injection device, a driving assembly and the automatic injection device, the guide pipe assembly comprises a guide pipe, a first limiting ring and a second limiting ring, the guide pipe comprises a pipe body, and a hollow cavity is defined by the pipe body; a contraction opening is formed in the far end of the pipe body and deforms when the pipe body is stressed, so that the pipe diameter of the far end of the pipe body is reduced; the first limiting ring is mounted in the hollow cavity at the far end of the guide tube and used for supporting the inner wall of the tube body, resisting deformation of the contraction opening and improving or avoiding the situation that the guide tube is separated from the automatic injection device due to deformation of the contraction opening; the second limiting ring is installed in the hollow cavity of the guide pipe and close to the near end, the second limiting ring is provided with a limiting protrusion, and the limiting protrusion and the guide pipe are adaptively connected in an abutting mode to form a limiting mechanism; the limiting mechanism is used for stopping the second limiting ring from axially moving and circumferentially rotating relative to the guide pipe, and the situation that the second limiting ring is disengaged from the guide pipe is improved or avoided.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a guide tube assembly, a driving assembly and an automatic injection device of an 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 assembly and a syringe assembly for containing the liquid medicine. The driving assembly 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, and the driving assembly 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 assembly provides a driving force for the piston, and the piston squeezes the liquid medicine and injects it into the human body through the injection needle to complete the injection operation of the automatic injection device.

[0003] However, there are some problems with existing automatic injection devices. The assembly between various components is not firm, so that when the driving force of the energy mechanism is released, other components are impacted and then separated unexpectedly, affecting the normal release of the driving assembly. Summary of the Utility Model

[0004] The present application provides a guide tube assembly, a driving assembly and an automatic injection device of an automatic injection device. The guide tube assembly can improve the stability of the driving assembly by setting a first limiting ring, improve or avoid the phenomenon that the guide tube deforms and disengages from the driving assembly, and can also improve or avoid the situation that the second limiting ring disengages from the guide tube through a limiting mechanism, thereby enhancing the stability and safety of the automatic injection device.

[0005] To solve the above technical problems, one technical solution adopted by the present application is: to provide a guide tube assembly of an automatic injection device, the guide tube assembly includes a guide tube, a first limiting ring and a second limiting ring. The guide tube includes a tube body, and the tube body encloses to form a hollow cavity. A hook is used to be installed on a clamping portion; a shrinkage opening is provided at the distal end of the tube body, and the shrinkage opening deforms when the tube body is stressed, so that the diameter of the distal end of the tube body becomes smaller; the first limiting ring is installed in the hollow cavity at the distal end of the guide tube to support the inner wall of the tube body and resist the deformation of the shrinkage opening; the second limiting ring is installed in the hollow cavity of the guide tube near the proximal end, and the second limiting ring has a limiting protrusion, and the limiting protrusion is in adaptive abutment with the guide tube to form a limiting mechanism; the limiting mechanism is used to block the axial movement and circumferential rotation of the second limiting ring relative to the guide tube; wherein, the distal end is the end far from the human body during injection, and the other end is the proximal end.

[0006] Wherein, the distal end of the tube body has a tube orifice, one end of the shrinkage opening is communicated with the tube orifice at the distal end of the tube body, and the shrinkage opening extends at least along the axis direction of the tube body.

[0007] The width of the contraction opening in the circumferential direction gradually decreases from the distal end toward the proximal end.

[0008] There are at least two contraction openings, and the two contraction openings are located on opposite sides of the outer wall of the tube body.

[0009] Among them, the guide tube also includes a slide groove and a limit groove; the slide groove is arranged on the inner wall of the proximal end of the tube body; the limit groove is arranged at the proximal end of the tube body and extends in the axial direction of the tube body, the limit groove and the slide groove are unidirectionally connected and are both arranged along the circumference of the guide tube; wherein, a limit protrusion is provided on the second limit ring, and the limit protrusion protrudes outward along the radial direction of the second limit ring. The limit protrusion can slide along the slide groove into the guide tube and rotate onto the limit groove, so that the limit protrusion abuts against the limit groove to form a first limit mechanism to prevent the second limit ring from moving axially relative to the guide tube.

[0010] Among them, the guide tube is also provided with an inclined surface, which is located between the limiting groove and the sliding groove and connects the limiting groove and the sliding groove; the limiting protrusion abuts against the side wall of the inclined surface to form a second limiting mechanism, which is used to prevent the second limiting ring from rotating circumferentially relative to the guide tube.

[0011] The inclined surface is smoothly connected to the top of the side wall of the limiting groove, and the side wall of the limiting groove and the bottom of the limiting groove have a height difference in the radial direction of the guide tube.

[0012] The present application also includes a second technical solution, which provides a drive assembly of an automatic injection device, including the above-mentioned guide tube assembly; the drive assembly also includes a bottom cover, which is provided with a snap-fit portion; the distal end of the guide tube assembly is connected and fixed to the bottom cover via the snap-fit portion.

[0013] A hook is provided at the distal end of the tube body, and the hook extends at least toward the tube body in a direction away from the axis. The hook is used to be installed in the engaging portion to connect and fix the guide tube to the bottom cover.

[0014] The difference between the diameter of the first limiting ring and the inner diameter of the tube body is smaller than the preset distance, so that when the hook is installed on the engaging portion, the first limiting ring abuts against the inner wall of the tube body.

[0015] The driving assembly further includes a fixing rod, which is located in the guide tube and is fixedly connected to the bottom cover, and a first limiting ring is sleeved on the outer periphery of the fixing rod.

[0016] Among them, the driving assembly also includes a push rod, a release sleeve and an elastic part. The push rod is coaxially installed in the guide tube, the release sleeve is sleeved on the outer periphery of the guide tube, and the elastic part is sleeved on the outer periphery of the release sleeve. One end of the elastic part abuts the bottom cover, and the other end of the elastic part abuts the proximal end of the release sleeve.

[0017] The present application also includes a third technical solution, which provides an automatic injection device including the above-mentioned drive assembly.

[0018] The beneficial effects of this application are as follows: Different from the prior art, the guiding tube assembly, driving assembly and automatic injection device provided by this application. The guiding tube assembly includes a guiding tube, a first limiting ring and a second limiting ring. Specifically, the guiding tube includes a tube body, and a hollow cavity is formed by surrounding the tube body. A shrinking opening is provided at the distal end of the tube body, and the shrinking opening deforms when the tube body is stressed, so that the diameter of the distal end of the tube body becomes smaller, which is convenient for the installation of the guiding tube. The first limiting ring is installed in the hollow cavity at the distal end of the guiding tube to support the inner wall of the tube body and resist the deformation of the shrinking opening. The second limiting ring is installed in the hollow cavity of the guiding tube near the proximal end. The second limiting ring has a limiting protrusion, and the limiting protrusion abuts against the guiding tube in a matching manner to form a limiting mechanism; the limiting mechanism is used to block the axial movement and circumferential rotation of the second limiting ring relative to the guiding tube. In the guiding tube assembly of the embodiment of this application, by arranging the first limiting ring in the hollow cavity to support the inner wall of the guiding tube and resist the deformation of the shrinking opening, the situation that the shrinking opening is deformed by stress and the guiding tube is separated from the driving assembly can be improved or avoided, the stability of the driving assembly can be improved, and the second limiting ring can also block other structures from sliding out of the guiding tube, and the position of the second limiting ring can be limited by the limiting mechanism, so as to improve or avoid the situation that the second limiting ring is separated from the guiding tube, thereby enhancing the stability and safety of the automatic injection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, among which:

[0020] Figure 1 is a schematic structural diagram of an embodiment of a driving assembly in the related art;

[0021] Figure 2 is a schematic structural diagram of an embodiment of the guiding tube assembly of this application;

[0022] Figure 3 is a schematic partial structural diagram of an embodiment of the automatic injection device of this application;

[0023] Figure 4 is a schematic structural diagram of the guiding tube of an embodiment of the guiding tube assembly of this application;

[0024] Figure 5 is a schematic structural diagram of the bottom cover of an embodiment of the automatic injection device of this application;

[0025] Figure 6 is a schematic structural diagram of the first limiting ring of an embodiment of the guiding tube assembly of this application;

[0026] Figure 7 It is a schematic structural diagram of the second limiting ring of an embodiment of the guiding tube assembly of the present application;

[0027] Figure 8 It is a schematic structural diagram of an embodiment of the driving assembly of the present application. Detailed implementation manners

[0028] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. Additionally, it should be noted that for the convenience of description, only the parts related to the present application are shown in the drawings, rather than all the structures. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0029] Referring to "embodiment" in this context means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification 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 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 only used 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" can 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 "installed", "connected", and "coupled" should be understood 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 can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it 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, in an auto-injection device, the most core component is undoubtedly the drive assembly 100'. Its design determines whether the auto-injection device can successfully complete an injection. Since the drive assembly 100' has many and miscellaneous components, it is also the component most prone to errors. The drive assembly 100' requires the close cooperation of each component to achieve the successful release of the drive assembly 100'. Therefore, each component needs to be strictly designed to fit adjacent components. When the drive assembly 100' is released, an energy mechanism 7' provides driving force and transmits the driving force to the syringe assembly to complete the injection. However, there are some problems in existing auto-injection devices. The assembly between components is not firm, so that when the driving force of the energy mechanism 7' is released, other components are impacted and then separated unexpectedly, affecting the normal release of the drive assembly 100'. For example, the energy mechanism 7' transmits the driving force to the push rod 4', and the push rod 4' transmits it to the guide tube assembly 1'. A suitable guide tube assembly 1' will have a certain limit on the push rod 4', while an inappropriate guide tube assembly 1' will cause the push rod 4' to rush out of the guide tube 11', resulting in drive failure. Therefore, it is necessary to design an auto-injection structure with closely fitting components that are not easily detached, so that the components of the drive assembly 100' fit more closely and avoid the risk of drive assembly 100' failure.

[0033] Please refer to Figures 2 - 7In one aspect, the present application provides a guide tube assembly 1 for an automatic injection device. For ease of understanding, the distal end is defined as the end of the automatic injection device that is away from the human body during injection, while the proximal end is defined as the distal end. The guide tube assembly 1 includes a guide tube 11, a first retaining ring 12, and a second retaining ring 13. The guide tube 11 is connected and fixed to the bottom cover 2 of the automatic injection device. Specifically, the bottom cover 2 is provided with a snap-fit portion 21. The guide tube 11 includes a tubular body 116, which encloses a hollow cavity. The distal end of the tubular body 116 is provided with a hook 111, which extends at least in a direction away from the axis of the tubular body 116. The hook 111 is configured to be mounted on the snap-fit portion 21 to securely connect the guide tube 11 to the bottom cover 2. The distal end of the tubular body 116 is provided with a constriction 112. The constriction 112 deforms when a force is applied to the tubular body 116, reducing the diameter of the distal end of the tubular body 116 to facilitate the installation and fixation of the hook 111 on the snap-fit portion 21. A first retaining ring 12 is installed within the hollow cavity at the distal end of the guide tube 11, supporting the inner wall of the tube body 116 and preventing deformation of the constriction opening 112. A second retaining ring 13 is installed within the hollow cavity of the guide tube 11 near the proximal end to prevent other structures from slipping out of the guide tube 11. The second retaining ring 13 has a retaining protrusion 131 that adaptably abuts against the guide tube 11 to form a retaining mechanism; this retaining mechanism prevents the second retaining ring 131 from axial movement and circumferential rotation relative to the guide tube 11. The guide tube assembly 1 of the embodiment of the present application can improve or avoid the phenomenon that the contraction opening 112 at the distal end of the guide tube 11 is deformed by force, so that the hook 111 is disengaged from the engaging portion 21 and the guide tube 11 is separated from the bottom cover 2, thereby improving the stability of the drive assembly. It can also prevent other structures from sliding out of the guide tube 11 through the second limiting ring 131, and limit the position of the second limiting ring 131 through a limiting mechanism, thereby improving or avoiding the situation that the second limiting ring 131 is disengaged from the guide tube 11, thereby improving the stability and safety of the automatic injection device.

[0034] Specifically, the hook 111 and the constriction opening 112 are arranged at intervals in the circumferential direction at the distal end of the tube body 116. By applying a force towards the axis direction of the tube body 116 on the outer wall of the tube body 116 at the position of the hook 111, the outer wall of the tube body 116 deforms towards the constriction opening 112 direction, thereby reducing the diameter of the tube body 116. When the diameter of the tube body 116 decreases, the hook 111 extends into the bottom cover 2 and aligns with the engaging portion 21. After removing the external force on the tube body 116, the tube body 116 deforms and the diameter is restored, thereby driving the hook 111 to be installed on the engaging portion 21. During use, the tube body 116 will inevitably be subjected to external force extrusion and other situations. In order to prevent the diameter of the tube body 116 from decreasing due to extrusion deformation, resulting in the hook 111 detaching from the engaging portion 21 and further causing the guide tube 11 to separate from the bottom cover 2, in this application, the first limiting ring 12 is installed in the hollow cavity at the distal end of the guide tube 11. When the tube body 116 is subjected to force extrusion, the inner wall of the tube body 116 is abutted by the first limiting ring 12 to improve the strength of the tube body 116 and resist the deformation of the constriction opening 112, thereby improving the stability of the hook 111 installed in the engaging portion 21, and further improving the stability of the connection between the guide tube 11 and the bottom cover 2, enhancing the stability and safety of the automatic injection device.

[0035] In an embodiment of the present application, the distal end of the tube body 116 has a tube opening, one end of the constriction opening 112 is communicated with the tube opening at the distal end of the tube body 116, and the constriction opening 112 extends at least along the axis direction of the tube body 116.

[0036] Specifically, the hook 111 is arranged on the outer wall of the tube body 116 at the tube opening, and the constriction opening 112 is communicated with the tube opening, which can increase the deformation amount at the tube opening, so as to facilitate the extrusion of the tube body 116 to install the hook 111 on the engaging portion 21.

[0037] In an embodiment of the present application, the number of the constriction openings 112 includes two, and the two constriction openings 112 are located on opposite sides of the outer wall of the tube body 116.

[0038] Specifically, the shape of the tube body 116 may include a hollow cylinder. Two constriction openings 112 are opened and communicated with the tube opening, so that the strength at the tube opening is reduced and it is easier to deform when subjected to force extrusion, thereby facilitating the installation of the hook 111. Further, the two constriction openings 112 may be respectively located on opposite sides of the hook 111, and the distal end of the tube body 116 is more easily deformed through the deformation of the two constriction openings 112. In another embodiment, the number of the constriction openings 112 may also include three, four or more than four, so as to facilitate the deformation of the tube body 116 and the reduction of the diameter, and simplify the installation of the hook 111.

[0039] In an embodiment of the present application, the width of the constriction opening 112 in the circumferential direction gradually decreases from the distal end towards the proximal end direction, so as to facilitate the restoration of the tube body 116 after the external force extrusion is removed and improve the stability.

[0040] In a specific embodiment, the shape of the contraction opening 112 may include a triangle, with the base of the triangle communicating with the pipe opening. The strength at the pipe opening is increased through the stability of the triangle, thereby improving reliability and stability. In another specific embodiment, the two sides of the triangle may include arcs, stepped shapes, etc. In other embodiments, the shape of the contraction opening 112 may also include other shapes such as a semi-circle to enhance the structural strength at the pipe opening.

[0041] In an embodiment of the present application, the difference between the diameter of the first limiting ring 12 and the inner diameter of the pipe body 116 is less than a preset distance. When the hook 111 is installed on the engaging portion 21, the first limiting ring 12 abuts against the inner wall of the guiding pipe 11 to support the guiding pipe 11, reduce the deformation amount of the guiding pipe 11, and improve or avoid the phenomenon that the guiding pipe 11 is deformed and separated from the bottom cover 2.

[0042] Specifically, when the hook 111 is installed on the engaging portion 21, due to the contraction opening 112, when an external force is applied to the distal end of the pipe body 116, the diameter of the pipe body 116 will become smaller, causing the hook 111 to disengage from the engaging portion 21. Let the diameter of the pipe body 116 in the initial state be the initial diameter, and the diameter at which the hook 111 can disengage from the engaging portion 21 be the limit diameter. The preset distance is the difference between the initial diameter and the limit diameter. As long as the deformation amount of the pipe body 116 is less than the preset distance, it can be ensured that the hook 111 is fixed to the engaging portion 21. Therefore, by arranging the first limiting ring 12 inside the pipe body 116 of the guiding pipe 11 and making the difference between the diameter of the first limiting ring 12 and the inner diameter of the pipe body 116 less than the preset distance, the inner wall of the guiding pipe 11 can be abutted against the inner wall of the guiding pipe 11 when the inner wall is subjected to an external force to support the guiding pipe 11, increase the strength of the pipe body 116, and improve reliability and stability.

[0043] In an embodiment of the present application, the guiding pipe 11 further includes a sliding groove 113 and a limiting groove 114. The sliding groove 113 is provided on the inner wall of the proximal end of the pipe body 116, and the limiting groove 114 is provided at the proximal end of the pipe body 116 and extends in the axial direction of the pipe body 116. The limiting groove 114 is unidirectionally communicated with the sliding groove 113 and is arranged along the circumferential direction of the guiding pipe 11 to facilitate the installation and fixation of the second limiting ring 13. Specifically, a limiting protrusion 131 is provided on the second limiting ring 13. The limiting protrusion 131 protrudes radially outward along the second limiting ring 13. The limiting protrusion 131 can slide along the sliding groove 113 into the guiding pipe 11 and rotate to the limiting groove 114 so that the limiting protrusion 131 abuts against the limiting groove 114 to form a first limiting mechanism to block the axial movement of the second limiting ring 13 relative to the guiding pipe 11.

[0044] Specifically, the limiting protrusion 131 slides along the sliding groove 113 into the guiding tube 11, and then rotates circumferentially to the limiting groove 114 and cooperates with the limiting groove 114 to realize the installation and fixation of the second limiting ring 13. Since the limiting protrusion 131 abuts against the bottom of the limiting groove 114 in the axial direction, the movement of the limiting protrusion 131 in the axial direction is restricted. Therefore, the first limiting mechanism formed by the abutment of the limiting protrusion 131 and the limiting groove 114 can limit the axial movement of the limiting protrusion 131, thereby improving or avoiding the phenomenon that the second limiting ring 13 disengages from the guiding tube 11.

[0045] Furthermore, the limiting groove 114 is unidirectionally communicated with the sliding groove 113, that is, the inclined surface 115 is smoothly connected to the top end of the side wall of the limiting groove 114. There is a height difference between the side wall of the limiting groove 114 and the bottom of the limiting groove 114 in the radial direction of the guiding tube 11. The limiting protrusion 131 can slide along the sliding groove 113 into the limiting groove 114. Due to the existence of the height difference, the side wall of the limiting groove 114 can limit the circumferential rotation of the limiting protrusion 131, thereby further improving or avoiding the phenomenon that the second limiting ring 13 disengages from the guiding tube 11.

[0046] In an embodiment of the present application, the guiding tube 11 is further provided with an inclined surface 115. The inclined surface 115 is located between the limiting groove 114 and the sliding groove 113 and communicates the limiting groove 114 with the sliding groove 113. The limiting protrusion 131 abuts against the side wall of the inclined surface 115 to form a second limiting mechanism for blocking the circumferential rotation of the second limiting ring 131 relative to the guiding tube 11.

[0047] Specifically, the inclined surface 115 is arranged along the circumferential direction of the guiding tube 11 and is inclined from low to high from the sliding groove 113 to the limiting groove 114, so as to facilitate the rotation of the limiting protrusion 131 from the sliding groove 113 to the position of the limiting groove 114 and improve the installation efficiency. The limiting protrusion 131 rotates from the sliding groove 113 along the inclined surface 115 to the position of the limiting groove 114. Since there is a height difference between the highest point of the inclined surface 115 and the groove where the limiting groove 114 is located in the radial direction, after the limiting protrusion 131 crosses the inclined surface 115, it will be blocked by the side wall of the inclined surface 115. The limiting protrusion 131 abuts against the side wall of the inclined surface 115 to form a second limiting mechanism. By the second limiting mechanism, the second limiting ring 131 is restricted from returning to the sliding groove, thereby realizing the circumferential limitation of the second limiting ring 131.

[0048] In an embodiment of the present application, the two sliding grooves 113, the limiting grooves 114, the inclined surfaces 115 and the limiting protrusions 131 are all symmetrically arranged, and each limiting protrusion 131 corresponds to each sliding groove 113, limiting groove 114 and inclined surface 115 one by one, which can further improve the stability.

[0049] Specifically, the corresponding two sliding grooves 113, limiting grooves 114, inclined surfaces 115 and limiting protrusions 131 are respectively equal in size and identical in shape, which is convenient for installation and can prevent the reduction of stability caused by misalignment during the installation process.

[0050] Please refer to Figure 3 and Figure 8 For another aspect of the present application, a driving assembly of an automatic injection device is provided, which includes the guiding tube assembly 1 and the bottom cover 2 of the above embodiment. The bottom cover 2 is provided with a clamping portion 21, and is fixedly connected to the guiding tube assembly 1 through the clamping portion 21. Specifically, since the driving assembly includes the guiding tube assembly 1 described in the above embodiment, it also has the beneficial effects of the above guiding tube assembly 1, which will not be elaborated here.

[0051] In an embodiment of the present application, the driving assembly 100 further includes a fixing rod 3. The fixing rod 3 is located inside the guiding tube 11 and is fixedly connected to the bottom cover 2. The first limiting ring 12 is sleeved on the outer periphery of the fixing rod 3.

[0052] Specifically, the fixing rod 3 can support and fix the first limiting ring 12 to prevent or avoid the first limiting ring 12 from flipping or rolling axially during use, resulting in the loss of support for the guiding tube 11. Further, the bottom cover 2 may include a round cover-like structure. The fixing rod 3 is coaxially connected to the center of the bottom cover 2, so that the first limiting ring 12 is located at the center position of the cross-section of the guiding tube 11, so that the entire circumference of the first limiting ring 12 can abut against the inner wall of the guiding tube 11, improving the utilization rate and stability.

[0053] In an embodiment of the present application, the driving assembly 100 further includes a push rod 4, a release sleeve 5 and an elastic member 6. The push rod 4 is coaxially installed inside the guiding tube 11. The release sleeve 5 is sleeved on the outer periphery of the guiding tube 11. The elastic member 6 is sleeved on the outer periphery of the release sleeve 5. One end of the elastic member 6 abuts against the bottom cover 2, and the other end of the elastic member 6 abuts against the proximal end of the release sleeve �.

[0054] Specifically, the automatic injection device further includes an injection assembly for injecting the liquid medicine into the human body. The push rod 4 is used to push the piston of the injection assembly to inject the liquid medicine into the human body. The release sleeve 5 is used to drive the push rod 4 to move. The elastic member 6 is used to reset the release sleeve 5 after the injection is completed.

[0055] Further, after the release sleeve 5 drives the push rod 4 to move, the push rod 4 moves axially from the distal end to the proximal end, and the second limiting ring 13 can prevent the push rod 4 from sliding out of the guiding tube 11.

[0056] In another aspect of the present application, an automatic injection device is further provided. The automatic injection device includes the above-mentioned driving assembly 100. Specifically, since the automatic injection device includes the driving assembly 100 described in the above embodiments, it also has the beneficial effects of the driving assembly 100, which will not be elaborated herein.

[0057] It should be noted that terms such as "horizontal" and "vertical" do not mean that the components are 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 have 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, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is 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. It is 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.

[0058] 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 optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices. The term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0059] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present application by the same token.

Claims

1. A guide tube assembly of an automatic injection device, characterized in that, Comprising: A guiding tube (11), the guiding tube (11) includes a tube body (116), and the tube body (116) encloses to form a hollow cavity; a contraction opening (112) is provided at the distal end of the tube body (116), and the contraction opening (112) deforms when the tube body (116) is stressed, so that the diameter of the distal end of the tube body (116) becomes smaller; A first limiting ring (12), the first limiting ring (12) is installed in the hollow cavity near the distal end, and is used to support the inner wall of the tube body (116) and resist the deformation of the contraction opening (112); A second limiting ring (13), the second limiting ring (13) is installed in the hollow cavity near the proximal end, the second limiting ring (13) has a limiting protrusion (131), and the limiting protrusion (131) abuts against the guiding tube (11) in a matching manner to form a limiting mechanism; the limiting mechanism is used to prevent the second limiting ring (13) from axially moving and circumferentially rotating relative to the guiding tube (11); wherein, the distal end is the end far from the human body during injection, and the relative other end is the proximal end.

2. The guiding tube assembly according to claim 1, wherein The distal end of the tube body (116) has a tube opening, one end of the contraction opening (112) is communicated with the tube opening at the distal end of the tube body (116), and the contraction opening (112) extends at least along the axis direction of the tube body (116).

3. The guiding tube assembly according to claim 1 or 2, wherein The width of the contraction opening (112) in the circumferential direction gradually decreases from the distal end towards the proximal end direction.

4. The guiding tube assembly according to claim 3, wherein The number of the contraction openings (112) includes at least two, and the two contraction openings (112) are located on opposite sides of the outer wall of the tube body (116).

5. The guide tube assembly according to claim 1, characterized in that The guiding tube (11) further includes: A sliding groove (113), which is arranged on the inner wall of the proximal end of the tube body (116); A limiting groove (114), which is arranged at the proximal end of the tube body (116) and extends towards the axis direction of the tube body (116), and the limiting groove (114) is unidirectionally communicated with the sliding groove (113) and both are arranged along the circumferential direction of the guiding tube (11); Wherein, the limiting protrusion (131) protrudes radially outward along the second limiting ring (13), and the limiting protrusion (131) can slide along the sliding groove (113) into the guiding tube (11) and rotate to the limiting groove (114), so that the limiting protrusion (131) abuts against the limiting groove (114) to form a first limiting mechanism to prevent the second limiting ring (13) from axially moving relative to the guiding tube (11).

6. The guiding tube assembly according to claim 5, wherein The guiding tube (11) is further provided with an inclined surface (115), and the inclined surface (115) is located between the limiting groove (114) and the sliding groove (113) and communicates the limiting groove (114) with the sliding groove (113); The limiting protrusion (131) abuts against the side wall of the inclined surface (115) to form a second limiting mechanism for preventing the second limiting ring (13) from rotating circumferentially relative to the guide tube (11).

7. The guide tube assembly according to claim 6, wherein, The inclined surface (115) is smoothly connected to the top of the side wall of the limiting groove (114), and the side wall of the limiting groove (114) and the bottom of the limiting groove (114) have a height difference in the radial direction of the guide tube (11).

8. A driving assembly of an automatic injection device, characterized in that, A guide tube assembly comprising any one of claims 1 to 7; The driving assembly further comprises a bottom cover (2), wherein the bottom cover (2) is provided with a snap-fit portion (21); The distal end of the guide tube assembly is connected and fixed to the bottom cover (2) via the clamping portion (21).

9. The drive assembly according to claim 8, wherein: A hook (111) is provided at the distal end of the tube body (116), and the hook (111) extends at least toward the tube body (116) in a direction away from the axis. The hook (111) is used to be mounted on the engaging portion (21) to connect and fix the guide tube (11) to the bottom cover (2).

10. The drive assembly according to claim 9, wherein: The difference between the diameter of the first limiting ring (12) and the inner diameter of the tube body (116) is smaller than a preset distance, so that when the hook (111) is installed on the engaging portion (21), the first limiting ring (12) presses against the inner wall of the tube body (116).

11. The drive assembly according to claim 8, wherein: The driving assembly further comprises a fixing rod (3), the fixing rod (3) being located in the guide tube (11) and being connected and fixed to the bottom cover (2), and the first limiting ring (12) being sleeved on the outer periphery of the fixing rod (3).

12. The drive assembly according to any one of claims 9 to 11, characterized in that: The driving assembly further comprises a push rod (4), a release sleeve (5) and an elastic member (6); the push rod (4) is coaxially mounted in the guide tube (11); the release sleeve (5) is sleeved on the outer periphery of the guide tube (11); the elastic member (6) is sleeved on the outer periphery of the release sleeve (5); one end of the elastic member (6) abuts against the bottom cover (2); and the other end of the elastic member (6) abuts against the proximal end of the release sleeve (5).

13. An automatic injection device, characterized in that, The drive assembly comprises the drive assembly according to any one of claims 8 to 12.

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