Cartridge containing assembly and injection device

Abstract

The invention relates to a medicine cylinder containing assembly and an injection device. The medicine cylinder containing assembly comprises a shell, and the far end of a medicine bottle is connected with a needle cap covering a needle head; the end cover comprises an elastic clamping arm, and the elastic clamping arm can be matched with the needle cap to form clamping connection; the limiting element is located in the shell and can move from a first position to a second position relative to the shell; wherein the restricting element is maintained in the first position when the cartridge containing assembly is in a vacant state in which the medicament bottle is not contained; when the cartridge containing assembly is in an assembled state containing the medicament bottle and assembled into the injection device, the limiting element is maintained in the second position; when the limiting element is located at the first position, the elastic clamping arm is allowed to be in clamping connection with the needle cap or separated from the needle cap; when the limiting element is located at the second position, the elastic clamping arm is prevented from being in clamping connection with the needle cap or being separated from the needle cap. The needle cap can be conveniently removed from the far end of the medicament bottle while a user pulls out the end cover from the far end of the shell.

Description

Technical Field

[0001] The present application relates to the technical field of injection devices, and in particular to a cartridge containing assembly and an injection device. Background Art

[0002] The injection device can inject the medicine contained therein into the patient's body from the patient's injection site through the needle. It usually includes a housing, a medicine bottle and a push assembly, wherein the medicine bottle is installed in the housing, and the medicine bottle includes a bottle body, a medicine placed in the bottle body, a needle at the far end of the bottle body and a movable piston at the near end of the bottle body, and the push assembly is used to push the movable piston to push the medicine in the bottle body from the needle into the patient's body. In order to prevent the needle of the medicine bottle from being exposed to the air, a needle cap covering the needle is detachably mounted on the medicine bottle, and accordingly, the far end of the injection device is usually equipped with an end cap that can remove the needle cap.

[0003] Specifically, the end cover is located at the far end of the housing and is detachably connected to the housing, and the end cover includes an elastic clamping arm extending into the housing and cooperating with the needle cap, and the elastic clamping arm includes an axially extending cantilever and a buckle protruding radially inward at the end of the cantilever; correspondingly, the needle cap has a clamping portion that cooperates with the buckle. During the assembly process, the elastic clamping arm of the end cover and the needle cap are close to each other, and the buckle on the cantilever abuts against the outer wall of the needle cap to cause the cantilever to elastically deform outward, and when the buckle moves to a position corresponding to the clamping portion of the needle cap, the cantilever returns to its position under the action of the elastic restoring force, so that the buckle and the clamping portion cooperate to form a clamping connection between the two, and then the user can remove the needle cap at the same time by pulling out the end cover.

[0004] However, when the user pulls out the end cover, the buckle on the cantilever is also subjected to the reaction force of the needle cap engaging portion. Since the cantilever can undergo elastic deformation, the reaction force received by the buckle is transmitted to the cantilever, which may cause the cantilever to deform. This will cause the engaging connection between the elastic clamping arm on the end cover and the needle cap to fail, so that the needle cap is not removed in the process, causing inconvenience in removing the needle cap. Summary of the invention

[0005] One of the purposes of the present application is to provide a cartridge accommodating assembly, which can prevent the elastic clamping arm from being separated from the needle cap due to the reaction of the needle cap when the injection device is actually used, thereby facilitating the user to remove the needle cap from the distal end of the medicine bottle while pulling out the end cover from the distal end of the shell.

[0006] The second object of the present application is to provide an injection device, which includes the cartridge accommodating assembly provided by one of the above objects, so that the user can remove the needle cap from the distal end of the medicine bottle while pulling out the end cover from the distal end of the shell.

[0007] One of the purposes of this application is to adopt the following technical solution:

[0008] A cartridge containing assembly for an injection device, comprising:

[0009] The housing is used to accommodate the medicine bottle, and the distal end of the medicine bottle is connected to a needle cap covering the needle;

[0010] An end cover is detachably connected to the distal end of the housing, and the end cover includes an elastic clamping arm, and the elastic clamping arm can cooperate with the needle cap to form a clamping connection;

[0011] a limiting element disposed within the housing and capable of moving relative to the housing from a first position to a second position;

[0012] Wherein, when the cartridge containing assembly is in an empty state without containing a medicine bottle, the limiting element is maintained in the first position; when the cartridge containing assembly is in an assembled state with containing a medicine bottle and assembled into an injection device, the limiting element is maintained in the second position;

[0013] When the limiting element is in the first position, the elastic clamping arm is allowed to form a clamping connection with the needle cap or to disengage the clamping connection; when the limiting element is in the second position, the elastic clamping arm is prevented from forming a clamping connection with the needle cap or to disengage the clamping connection.

[0014] By adopting the above technical solution, when the cartridge accommodating assembly is in an empty state to be installed with a medicine bottle, the limiting element is in the first position, at which time the elastic clamping arm is allowed to form a clamping connection or disengage the clamping connection with the needle cap, thereby facilitating the user to install the medicine bottle into the shell and make the needle cap at the distal end of the medicine bottle cooperate with the elastic clamping arm of the end cover to form a clamping connection; when the cartridge accommodating assembly is in an assembled state to accommodate the medicine bottle and be assembled into an injection device, the limiting element is in the second position, at which time the elastic clamping arm is prevented from forming a clamping connection or disengaging the clamping connection with the needle cap, thereby facilitating the user to remove the needle cap from the distal end of the medicine bottle while pulling out the end cover from the distal end of the shell.

[0015] Furthermore, the radial movement distance required for the elastic clamping arm to undergo radial elastic deformation when the elastic clamping arm forms a clamping connection with the needle cap or breaks the clamping connection is defined as D, the limiting element is provided with a limiting portion, and the radial spacing between the limiting portion on the limiting element in the second position and the elastic clamping arm is defined as d, wherein d<D.

[0016] Furthermore, the end cover also includes a cover body covering the distal end of the shell, the elastic clamping arm includes a cantilever and a buckle on the cantilever, the cantilever extends axially from the cover body to the proximal end, the buckle extends radially inward, and the buckle includes a first surface and a second surface opposite to each other in the axial direction, the first surface is closer to the cover body than the second surface; the second surface is inclined toward the direction close to the cover body along the direction in which the buckle extends radially inward.

[0017] By adopting the above technical solution, during the process of the elastic clamping arm of the end cover and the needle cap at the far end of the medicine bottle being clamped and connected, the two approach each other axially, and the far end of the needle cap first contacts the second surface of the buckle and slides relatively, so as to facilitate the elastic deformation of the cantilever radially outward.

[0018] Furthermore, the first surface is inclined toward the direction approaching the cover body along the direction in which the buckle extends radially inward.

[0019] The first surface of the buckle is used to be clamped in the clamping part of the needle cap. By adopting the above technical solution, when the end cover is pulled out, the first surface of the buckle is biased towards the radial inward direction by the reaction force of the clamping part of the needle cap, so it is not easy to cause the elastic clamping arm to undergo radial outward elastic deformation.

[0020] Furthermore, the first surface is inclined in a direction away from the cover body along a direction in which the buckle extends radially inward.

[0021] By adopting the above technical solution, after the end cap is injection molded, the core can be pulled out from the direction away from the cover body. Because the first surface of the buckle is subjected to a reaction force that tends to point radially outward during the core pulling process, the elastic clamping arm can undergo radially outward elastic deformation, thereby completing the core pulling action.

[0022] Furthermore, an elastic element is included, wherein the elastic element is used to provide a maintaining force for the limiting element to maintain the first position, and the elastic element undergoes elastic deformation when the limiting element moves from the first position to the second position.

[0023] Furthermore, the end cover is provided with a positioning plane, and the positioning plane is used for the needle cap to abut against so as to define the axial position of the end cover and the needle cap, and when the positioning plane abuts against the needle cap, the elastic clamping arm and the needle cap form a clamping connection.

[0024] Further, the limiting element in the first position is further away from the end cover than the limiting element in the second position.

[0025] Furthermore, an axial guiding structure is provided between the limiting element and the end cover, and the axial guiding structure is used for guiding the relative axial movement of the limiting element and the end cover.

[0026] The second purpose of this application adopts the following technical solution:

[0027] An injection device comprises a medicine bottle, a pushing assembly and the above-mentioned cartridge containing assembly, wherein the medicine bottle is accommodated in the shell, and the needle cap at the distal end of the medicine bottle cooperates with the elastic clamping arm of the end cover to form a clamping connection, the pushing assembly is in the shell on the proximal side of the medicine bottle, and the pushing assembly is used to provide a maintaining force to maintain the limiting element in the second position.

[0028] By adopting the above technical solution, it is convenient for the user to remove the needle cap from the distal end of the medicine bottle while pulling out the end cover from the distal end of the shell.

[0029] Further, the shell includes an upper shell and an upper shell that are connected to each other, the limiting element is accommodated in the lower shell, and the pushing assembly is accommodated in the upper shell. When the upper shell is connected to the lower shell, the pushing assembly provides an external force for the limiting element to move from a first position to a second position.

[0030] In summary, this application at least includes the following beneficial effects:

[0031] When the cartridge accommodating assembly is in an empty state to be installed with a medicine bottle, the limiting element is in a first position, at which time the elastic clamping arm is allowed to form a snap connection or disengage the snap connection with the needle cap, thereby facilitating the user to install the medicine bottle into the shell and make the needle cap at the distal end of the medicine bottle cooperate with the elastic clamping arm of the end cover to form a snap connection; when the cartridge accommodating assembly is in an assembled state to accommodate the medicine bottle and be assembled into an injection device, the limiting element is in a second position, at which time the elastic clamping arm is prevented from forming a snap connection or disengaging the snap connection with the needle cap, thereby facilitating the user to remove the needle cap from the distal end of the medicine bottle while pulling out the end cover from the distal end of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is an exploded schematic diagram of a cartridge accommodating assembly and a medicine bottle in an embodiment of the present application;

[0033] Figure 2 is a schematic diagram of the end cover and the needle cap forming a snap-fit ​​connection in an embodiment of the present application;

[0034] Figure 3 is a schematic diagram of an embodiment of the present application in which no medicine bottle is loaded in the cartridge accommodating assembly and the limiting element is in the first position;

[0035] Figure 4 is a schematic diagram of a cartridge accommodating assembly in an embodiment of the present application in which a medicine bottle is loaded and a limiting element is in a first position;

[0036] Figure 5 is a schematic diagram of a cartridge accommodating assembly in an embodiment of the present application in which a medicine bottle is loaded and a limiting element is in a second position;

[0037] Figure 6is a schematic diagram used to illustrate the radial spacing d of the limiting element in the second position in the embodiment of the present application;

[0038] Figure 7 is a cross-sectional view showing a housing in an embodiment of the present application;

[0039] Figure 8 is a schematic diagram showing the structure of the limiting element in the embodiment of the present application;

[0040] Fig. 9 is a schematic diagram showing the structure of the cartridge holder in the embodiment of the present application;

[0041] Fig.10 is a schematic diagram showing the structure of the end cover in an embodiment of the present application;

[0042] Fig.11 is a cross-sectional view showing the end cap in an embodiment of the present application;

[0043] Fig.12 It is a schematic diagram showing the inner limiting portion and the axial groove of the limiting element in the embodiment of the present application.

[0044] Explanation of the reference numerals: 1. Shell; 11. Inner shell; 12. Outer shell; 121. Axial guide rib; 13. First chamber; 14. Second chamber; 15. Axial channel; 2. End cover; 21. Elastic clamping arm; 211. Cantilever; 212. Buckle; 2121. First surface; 2122. Second surface; 22. Cover body; 23. Axial convex rib; 24. Center column; 241. Positioning plane; 3. Limiting element; 31. Cylindrical body; 311. Axial groove; 32. Axial extension arm; 321. Guide groove; 33. First section; 34. Second section; 341. Limiting portion; 4. Cartridge holder; 41. Axial guide groove; 42. Guide boss; 43. Outer wall boss; 5. Elastic element; 6. Medicine bottle; 7. Needle cap; 71. Engaging portion. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In order to prevent the needle of the medicine bottle from being exposed to the air, a needle cap covering the needle is detachably mounted on the medicine bottle. Accordingly, the distal end of the injection device is usually provided with an end cap capable of removing the needle cap. The end cap is located at the distal end of the housing and is detachably connected to the housing. The end cap includes an elastic clamping arm extending into the housing and cooperating with the needle cap. The elastic clamping arm includes an axially extending cantilever and a buckle protruding radially inward at the end of the cantilever. Correspondingly, the needle cap has a clamping portion cooperating with the buckle. During the assembly process, the elastic clamping arm of the end cap and the needle cap are close to each other, and the buckle on the cantilever abuts against the outer wall of the needle cap, causing the cantilever to deform elastically outward. When the buckle moves to a position corresponding to the clamping portion of the needle cap, the cantilever returns to its original position under the action of the elastic restoring force, so that the buckle and the clamping portion cooperate to form a clamping connection between the two, and then the user can remove the needle cap at the same time by pulling out the end cap. However, when the user pulls out the end cover, the buckle on the cantilever is also subjected to the reaction force of the needle cap engaging portion. Since the cantilever can undergo elastic deformation, the reaction force received by the buckle is transmitted to the cantilever, which may cause the cantilever to deform, which will cause the engaging connection between the elastic clamping arm on the end cover and the needle cap to fail, so that the needle cap is not removed in the process.

[0049] The embodiment of the present application discloses a cartridge containing assembly, which, as an assembly assembly of an injection device, can prevent the elastic clamping arm 21 from being separated from the needle cap 7 due to the reaction of the needle cap 7 when the injection device is actually used, thereby facilitating the user to remove the needle cap 7 from the distal end of the medicine bottle 6 while pulling out the end cover 2 from the distal end of the shell 1.

[0050] It should be noted that the cartridge containing assembly involved in the present application can contain a medicine bottle 6, and after containing the medicine bottle 6, it can be assembled with other components to form an injection device for the user to inject the medicine; at the same time, the aforementioned medicine bottle 6 includes a bottle body, a medicine placed in the bottle body, a needle at the far end of the bottle body, and a movable piston at the near end of the bottle body. At the same time, the proximal end mentioned in the embodiments of the present application refers to the end close to the user's operating part, and the distal end refers to the end away from the user's operating part. Specifically in the subsequent embodiments, the distal end refers to the end close to the patient's injection site during use, and the direction between the proximal end and the distal end is defined as the axial direction.

[0051] In addition, for the convenience of subsequent description, the state in which the cartridge containing assembly has not yet contained the medicine bottle 6 is defined as the empty state of the cartridge containing assembly, and the state in which the cartridge containing assembly contains the medicine bottle 6 and is assembled with other components to form an injection device is defined as the assembled state of the cartridge containing assembly.

[0052] Reference Figures 1 to 4 The cartridge containing assembly includes a shell 1, an end cover 2 and a limiting element 3, wherein the shell 1 is roughly cylindrical and has opposite distal and proximal ends, and the shell 1 is used to accommodate a medicine bottle 6, and the distal end of the medicine bottle 6 is connected to a needle cap 7 covering the needle. The end cover 2 is detachably connected to the distal end of the shell 1 and can close the distal opening of the shell 1. At the same time, the end cover 2 includes an elastic clamping arm 21, which can cooperate with the needle cap 7 to form a clamping connection. In addition, the limiting element 3 is in the shell 1 and can move from a first position to a second position relative to the shell 1 under the action of an external force. Wherein, Figure 3 is a schematic diagram showing that the cartridge accommodating assembly is not loaded with a medicine bottle 6 and the limiting element 3 is in the first position, corresponding to the empty state of the cartridge accommodating assembly described above; Figure 4 is a schematic diagram of a cartridge accommodating assembly loaded with a medicine bottle 6 and a limiting element 3 in a first position, wherein the cartridge accommodating assembly in this state can be further assembled with other components; Figure 5 It is a schematic diagram showing that a medicine bottle 6 is loaded in a cartridge accommodating assembly and the limiting element 3 is in the second position. In this state, the limiting element 3 may be locked with the housing 1 and maintained in the second position, or may be held in the second position by other components not shown for assembling the injection device, and also corresponds to the assembly state of the aforementioned cartridge accommodating assembly.

[0053] Combination Figures 3 to 5When the cartridge containing assembly is in an empty state, the limiting element 3 is in a first position relative to the housing 1; when the cartridge containing assembly is in an assembled state, the limiting element 3 is in a second position relative to the housing 1. In addition, the radial moving distance required for the elastic clamping arm 21 to undergo radial elastic deformation when the elastic clamping arm 21 forms a snap connection with the needle cap 7 or is disconnected from the snap connection is defined as D. The above content indicates that theoretically, the radial moving distance required for the elastic clamping arm 21 to undergo radial elastic deformation when the elastic clamping arm 21 forms a snap connection with the needle cap 7 is at least D, and also indicates that theoretically, the radial moving distance required for the elastic clamping arm 21 to undergo radial elastic deformation when the elastic clamping arm 21 is disconnected from the needle cap 7 is at least D.

[0054] Accordingly, refer to Figure 3 and Figure 4 When the limiting element 3 is in the first position, the elastic clamping arm 21 is allowed to undergo radial elastic deformation with a radial moving distance of d1, d1 ≥ D, that is, the elastic clamping arm 21 is allowed to form a snap connection with the needle cap 7 or to disengage the snap connection; thereby, in the empty state of the cartridge containing assembly, the medicine bottle 6 can be installed into the housing 1 and the needle cap 7 at the distal end of the medicine bottle 6 cooperates with the elastic clamping arm 21 of the end cover 2 to form a snap connection.

[0055] Reference Figure 5 and Figure 6 When the limiting element 3 is in the second position, the elastic clamping arm 21 is prevented from undergoing radial elastic deformation with a radial moving distance of d2, d2<D, that is, the elastic clamping arm 21 is prevented from forming a snap connection with the needle cap 7 or disengaging the snap connection; thus, when the cartridge containing assembly is assembled into an injection device, the needle cap 7 at the distal end of the medicine bottle 6 and the elastic clamping arm 21 of the end cover 2 can maintain a stable snap connection, so that the user can remove the needle cap 7 from the distal end of the medicine bottle 6 while pulling out the end cover 2 from the distal end of the housing 1.

[0056] It can be understood that in the process of the elastic clamp arm 21 forming a clamping connection with the needle cap 7 and in the process of the elastic clamp arm 21 being disengaged from the clamping connection with the needle cap 7, the elastic clamp arm 21 will undergo radial elastic deformation, and the radial activity distance required for the elastic clamp arm 21 to undergo radial elastic deformation during the formation of the clamping connection and during the disengagement of the clamping connection is the same. In the above, the radial activity distance is defined as D.

[0057] It should be noted that the limiting element 3 can move from the first position to the second position relative to the housing 1, which means that the limiting element 3 can change its position relative to the housing 1, but does not limit the specific movement form of the limiting element 3 relative to the housing 1. In this embodiment, the limiting element 3 is configured to be able to move from the first position to the second position along the axial translation relative to the housing 1; in other specific embodiments, the limiting element 3 is configured to be able to move from the first position to the second position by spiral motion relative to the housing 1; in other specific embodiments, the limiting element 3 is configured to be able to rotate relative to the housing 1 and move from the first position to the second position. At the same time, in the specific embodiment in which the limiting element 3 moves axially or spirally relative to the housing 1, the first position of the limiting element 3 can be configured to be farther away from the end cover 2 than the second position, so that the movement of the limiting element 3 from the first position to the second position is a movement close to the end cover 2; in other embodiments, the movement of the limiting element 3 from the first position to the second position can also be a movement away from the end cover 2.

[0058] It is understandable that the shell 1 is used to accommodate the medicine bottle 6. The internal dimensions of the shell 1 may be set to match the medicine bottle 6, or other built-in components configured with the outer diameter of the medicine bottle 6 may be added to the shell 1.

[0059] Reference Figure 1 and Figure 7 In some embodiments, the shell 1 includes an inner shell 11 and an outer shell 12, and the inner shell 11 has an inner cavity for limiting the position of the medicine bottle 6 in the shell 1. It can be understood that in some specific examples, the inner cavity can be configured to adapt to the outer wall of the medicine bottle 6 so that the inner cavity of the inner shell 11 directly limits the position of the medicine bottle 6 in the shell 1; the inner cavity can also be set to be larger than the outer wall of the medicine bottle 6, and other components can be added between the inner cavity and the medicine bottle 6 to limit the position of the medicine bottle 6 in the shell 1.

[0060] Combination Figure 1 and Figure 7 In some specific examples, the cartridge containing assembly also includes a cartridge holder 4 inserted into the inner cavity of the inner shell 11. The cartridge holder 4 is generally cylindrical in structure, and the outer wall size of the cartridge holder 4 is matched with the inner wall size of the inner shell 11, and the inner wall size of the cartridge holder 4 is matched with the outer wall size of the medicine bottle 6, thereby limiting the position of the medicine bottle 6 in the shell 1.

[0061] Meanwhile, in some examples of the above embodiments, the limiting element 3 can translate axially relative to the housing 1 , which may specifically be that the limiting element 3 forms a direct or indirect axial guiding fit with the housing 1 .

[0062] Reference Figure 7The outer wall of the inner shell 11 and the inner wall of the outer shell 12 are connected by two symmetrical inner edges, so that the space between the inner shell 11 and the outer shell 12 is divided into a first chamber 13 at the proximal end and a second chamber 14 at the distal end by the position of the inner edges, and the interval between the two symmetrically arranged inner edges forms two axial channels 15 between the first chamber 13 and the second chamber 14; accordingly, combined Figure 8 The limiting element 3 is a long strip structure extending in the axial direction, and the limiting element 3 includes a cylindrical body 31 and two symmetrically arranged axial extension arms 32, the axial extension arms 32 extend axially from the cylindrical body 31 to the proximal end, and the axial extension arms 32 pass through the axial channel 15 from the second chamber 14 at the distal end to the first chamber 13 at the proximal end, and the inner edge of the limiting element 3 is abutted against the proximal end surface of the cylindrical body 31 to limit the maximum position of the limiting element 3 that can move proximally relative to the housing 1. In some specific examples, the axial guide cooperation between the limiting element 3 and the housing 1 can be achieved by the cooperation of the axial delay arm and the axial channel 15.

[0063] Reference Figure 1 In some more specific examples, the limiting element 3 indirectly forms an axial guiding fit with the housing 1 through the cartridge holder 4. Figure 8 and Fig. 9 , the proximal outer wall of the cartridge holder 4 is provided with an axially extending axial guide groove 41, and accordingly, the proximal inner wall of the shell 12 is provided with an axial guide rib 121 that can be embedded in the axial guide groove 41, and the axial guide groove 41 and the axial guide rib 121 cooperate to form an axial guide fit between the cartridge holder 4 and the shell 1. At the same time, the outer wall of the section between the proximal end and the distal end of the cartridge holder 4 is provided with a guide boss 42 extending radially outward, and accordingly, the limiting element 3 includes two symmetrically arranged axial extension arms 32, and the two axial extension arms 32 have guide grooves 321 that cooperate with the guide boss 42, so as to achieve the axial guide fit between the cartridge holder 4 and the limiting element 3. In addition, in this embodiment, the two ends of the guide groove 321 in the extension direction are closed to achieve the farthest end and the closest end when the limiting element 3 and the cartridge holder 4 move relative axially; at the same time, in the process of assembling the sleeve holder and the limiting element 3, the two axial extension arms 32 of the limiting element 3 can be separated from each other so that the guide boss 42 can be embedded in the guide groove 321.

[0064] It should be noted that the limiting element 3 can be maintained in the first position when the cartridge containing assembly is in an empty state, and can be moved from the first position to the second position by an external force, which means that the limiting element 3 is directly or indirectly elastically connected to the shell 1, so that the limiting element 3 can be maintained in the first position by elastic force, and when the limiting element 3 is subjected to external force, the elastic part in the elastic connection can be elastically deformed to allow the limiting element 3 to change position.

[0065] Reference Figure 1 , Figures 7 to 9 In some embodiments in which the limiting element 3 is axially translated relative to the shell 1, the medicine containing assembly further includes an elastic element 5, which is an axially extending linear spring, the distal end of the elastic element 5 abuts against the proximal surface of the inner shell 11, and the proximal end of the spring element abuts against the outer wall boss 43 of the cartridge holder 4, and the elastic force of the elastic element 5 is transmitted to the limiting element 3 through the abutment between the guide boss 42 on the cartridge holder 4 and the proximal groove wall of the guide groove 321 of the axially extending arm 32 on the limiting element 3, so as to maintain the limiting element 3 in a first position relative to the shell 1; at the same time, when the limiting element 3 is subjected to an external force toward the distal end, the limiting element 3 drives the cartridge holder 4 to move toward the distal end and compresses the elastic element 5, so that the limiting element 3 can move from the first position to the second position closer to the distal end.

[0066] Further, refer to Fig.10 and Fig.11 In some embodiments, the end cover 2 further includes a cover body 22 covering the distal end of the housing 1, and there are two elastic clamping arms 21, each of which includes a cantilever 211 extending axially from the cover body 22 to the proximal end and a buckle 212 on the cantilever 211. Figures 3 to 5 For the convenience of subsequent description, when the end cover 2 is installed at the far end of the housing 1, the area where the cantilever 211 and the buckle 212 are located is the engagement activity area; the limiting element 3 is arranged around the outer side of the elastic clamping arm 21 of the end cover 2, and an axial guiding structure is provided between the limiting element 3 and the end cover 2 to guide the relative movement between the limiting element 3 and the end cover 2. Fig.10 and Fig.12 The inner wall at the distal end of the limiting element 3 is provided with an axial groove 311. Correspondingly, the outer wall of the elastic clamping arm 21 of the end cover 2 is provided with an axial rib 23 that cooperates with the axial groove 311. The axial guiding structure between the limiting element 3 and the end cover 2 is realized through the cooperation between the axial rib 23 and the axial groove 311.

[0067] Reference Figure 4 and Figure 5 The limiting element 3 includes a first section 33 and a second section 34 distributed in the axial direction; when the limiting element 3 is in the first position, the first section 33 of the limiting element 3 is located at the radial periphery of the engaging activity area, and the radial distance between the inner wall of the first section 33 and the elastic clamping arm 21 is d3, d3 ≥ D, so that the elastic clamping arm 21 is allowed to form an engaging connection with the needle cap 7 or to be disengaged from the engaging connection; when the limiting element 3 is in the second position, the second section 34 of the limiting element 3 is located at the radial periphery of the engaging activity area; combined with Fig.12The inner wall of the second section 34 is provided with a limiting portion 341 corresponding to the position of the buckle 212, and the limiting portion 341 is configured as a protrusion extending radially inward, and the radial distance between the limiting portion 341 and the elastic clamping arm 21 is d, d<D, so that the elastic clamping arm 21 is prevented from forming a clamping connection with the needle cap 7 or disengaging the clamping connection.

[0068] Reference Fig.11 The buckle 212 extends radially inward, and includes a first surface 2121 and a second surface 2122 that are opposite to each other in the axial direction, wherein the first surface 2121 is closer to the cover body 22 than the second surface 2122, and the second surface 2122 is inclined toward the direction close to the cover body 22 along the direction in which the buckle 212 extends radially inward. Figure 2 The proximal end surface of the needle cap 7 serves as a snap-fitting portion 71 that cooperates with the buckle 212 to form a snap-fitting connection. In the process of the needle cap 7 and the end cover 2 forming a snap-fitting connection, the elastic snap-fitting arm 21 of the end cover 2 and the needle cap 7 approach each other, and the buckle 212 on the cantilever 211 abuts against the outer wall of the needle cap 7, causing the cantilever 211 to undergo radial elastic deformation outward. When the buckle 212 moves to a position corresponding to the snap-fitting portion 71 of the needle cap 7, the cantilever 211 returns to its original position under the action of the elastic restoring force, so that the buckle 212 cooperates with the snap-fitting portion 71 to form a snap-fitting connection between the two. Furthermore, in some specific examples, the end cover 2 is also provided with a middle column 24, and the distal surface of the middle column 24 serves as a positioning plane 241. The positioning plane 241 is used for the needle cap 7 to abut against to limit the axial position of the end cover 2 and the needle cap 7. When the positioning plane 241 abuts against the needle cap 7, the position of the buckle 212 corresponds to the locking portion 71 of the needle cap 7, so as to realize the locking connection between the elastic locking arm 21 of the end cover 2 and the needle cap 7.

[0069] Furthermore, when the elastic clamping arm 21 on the end cover 2 cooperates with the needle cap 7 to form a clamping connection, the second surface 2122 of the clamping arm 212 abuts against the clamping portion 71. When the user pulls out the end cover 2 to the far end relative to the housing 12, the second surface 2122 of the clamping arm 212 transmits force to the clamping portion 71 of the needle cap 7, so as to pull out the needle cap 7 synchronously. Further, in some embodiments, the first surface 2121 is inclined in the direction away from the cover body 22 along the radially inward extension direction of the clamping arm 212; so that the first surface 2121 of the clamping arm 212 is biased to the radially inward direction by the reaction force of the clamping portion 71 of the needle cap 7, so that it is not easy to cause the elastic clamping arm 21 to undergo radially outward elastic deformation. In other embodiments, in order to facilitate the core-pulling demoulding of the end cover 2, the first surface 2121 can also be inclined in the direction close to the cover body 22 along the radially inward extension direction of the clamping arm 212.

[0070] An injection device is also disclosed in an embodiment of the present application, which facilitates the user to pull out the end cover 2 from the distal end of the housing 1 and remove the needle cap 7 from the distal end of the medicine bottle 6 at the same time.

[0071] Specifically, the injection device includes a medicine bottle 6, a push assembly and the above-mentioned cartridge accommodating assembly, wherein the medicine bottle 6 is accommodated in the housing 1, and the needle cap 7 at the distal end of the medicine bottle 6 cooperates with the elastic clamp arm 21 of the end cover 2 to form a clamping connection; the push assembly is in the housing 1 on the proximal side of the medicine bottle 6, and the push assembly is used to push the movable piston to push the medicine in the bottle from the needle into the patient's body. At the same time, the push assembly is used to provide a maintaining force to maintain the limiting element 3 in the second position.

[0072] In some embodiments, the shell 1 of the injection device is an integral structure. During the actual assembly process, the end cover 2 and the limiting element 3 are first installed at the distal end of the shell 1 to form the aforementioned cartridge containing assembly, and the cartridge containing assembly is in an empty state at this time. Then, the medicine bottle 6 is loaded into the shell 1 from the proximal end of the shell 1, and then the pushing assembly is loaded into the shell 1 from the proximal end of the shell 1, and the pushing assembly is used during the installation process to push the limiting element 3 from the first position to the second position, and finally, the proximal end of the shell 1 is closed to obtain the injection device.

[0073] In other embodiments, the shell 1 of the injection device is a split structure, that is, the shell 1 includes an upper shell and a lower shell that are connected to each other. During the actual assembly process, the end cover 2 is installed at the distal end of the lower shell, and the limiting element 3 is installed in the lower shell to form the aforementioned cartridge containing assembly in an empty state, and the pushing assembly is installed in the upper shell to form an upper assembly; then, the medicine bottle 6 is loaded into the lower shell from the proximal end of the lower shell, and then the upper assembly is connected to the cartridge containing assembly. During the connection process between the two, the pushing assembly in the upper assembly pushes the limiting element 3 to move from the first position to the second position, and finally the injection device is obtained.

[0074] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cartridge containing assembly for an injection device, characterized in that: include: The housing is used to accommodate the medicine bottle, and the distal end of the medicine bottle is connected to a needle cap covering the needle; An end cover is detachably connected to the distal end of the housing, and the end cover includes an elastic clamping arm, and the elastic clamping arm can cooperate with the needle cap to form a clamping connection; a limiting element disposed within the housing and capable of moving relative to the housing from a first position to a second position; Wherein, when the cartridge containing assembly is in an empty state without containing a medicine bottle, the limiting element is maintained in the first position; when the cartridge containing assembly is in an assembled state with containing a medicine bottle and assembled into an injection device, the limiting element is maintained in the second position; When the limiting element is in the first position, the elastic clamping arm is allowed to form a clamping connection with the needle cap or to disengage the clamping connection; when the limiting element is in the second position, the elastic clamping arm is prevented from forming a clamping connection with the needle cap or to disengage the clamping connection.

2. The cartridge containing assembly according to claim 1, characterized in that: The radial movement distance required for the elastic clamp arm to undergo radial elastic deformation when the elastic clamp arm forms a clamping connection with the needle cap or breaks the clamping connection is defined as D. The limiting element is provided with a limiting portion, and the radial spacing between the limiting portion on the limiting element in the second position and the elastic clamp arm is defined as d, wherein d<D.

3. The cartridge containing assembly according to claim 1, characterized in that: The end cover also includes a cover body covering the distal end of the shell, the elastic clamping arm includes a cantilever and a buckle on the cantilever, the cantilever extends axially from the cover body to the proximal end, the buckle extends radially inward, and the buckle includes a first surface and a second surface opposite to each other in the axial direction, the first surface is closer to the cover body than the second surface; the second surface is inclined toward the direction close to the cover body along the direction in which the buckle extends radially inward.

4. The cartridge containing assembly according to claim 3, characterized in that: The first surface is inclined toward the direction approaching the cover body along the direction in which the buckle extends radially inward.

5. The cartridge containing assembly according to claim 3, characterized in that: The first surface is inclined in a direction away from the cover body along a direction in which the buckle extends radially inward.

6. The cartridge containing assembly according to claim 1, characterized in that: It also includes an elastic element, which is used to provide a maintaining force for the limiting element to maintain the first position, and the elastic element undergoes elastic deformation when the limiting element moves from the first position to the second position.

7. The cartridge containing assembly according to claim 1, characterized in that: The end cover is provided with a positioning plane, and the positioning plane is used for the needle cap to abut against so as to limit the axial position of the end cover and the needle cap, and when the positioning plane abuts against the needle cap, the elastic clamping arm and the needle cap form a clamping connection.

8. The cartridge containing assembly according to claim 1, characterized in that: The restraining element in the first position is further away from the end cap than the restraining element in the second position.

9. The cartridge containing assembly according to claim 1, characterized in that: An axial guiding structure is provided between the limiting element and the end cover, and the axial guiding structure is used to guide the relative axial movement of the limiting element and the end cover.

10. An injection device, characterized in that: It includes a medicine bottle, a pushing assembly and a cartridge containing assembly as described in any one of claims 1 to 9, the medicine bottle is accommodated in the shell, and the needle cap at the distal end of the medicine bottle cooperates with the elastic clamping arm of the end cover to form a snap connection, the pushing assembly is in the shell on the proximal side of the medicine bottle, and the pushing assembly is used to provide a maintaining force to maintain the limiting element in the second position.

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