Cartridge containing assembly and injection device

Abstract

The application relates to a cartridge containing assembly and an injection device, the cartridge containing assembly comprising a housing, a distal end of a medicament vial having a needle cap covering a needle, a cap comprising a resilient catch arm configured to form a catch connection with the needle cap, a limiting element within the housing and movable relative to the housing from a first position to a second position, wherein the limiting element is maintained in the first position when the cartridge containing assembly is in an idle state not containing a medicament vial, and the limiting element is maintained in the second position when the cartridge containing assembly is in an assembled state containing a medicament vial and assembled as an injection device, wherein the resilient catch arm is allowed to form the catch connection with the needle cap or to disengage from the catch connection when the limiting element is in the first position, and the resilient catch arm is prevented from forming the catch connection with the needle cap or to disengage from the catch connection when the limiting element is in the second position. The application facilitates a user to pull the cap off the distal end of the housing while simultaneously removing the needle cap from the distal end of the medicament vial.

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

[0002] An injection device is capable of injecting a medicament contained therein into a patient through a needle from an injection site of the patient, which generally comprises a housing, a medicament bottle and a pushing assembly, wherein the medicament bottle is mounted in the housing, and the medicament bottle comprises a bottle body, a medicament placed in the bottle body, a needle at a distal end of the bottle body and a movable piston at a proximal end of the bottle body, and the pushing assembly is used to push the movable piston to inject the medicament in the bottle body into the patient through the needle. In order to avoid the needle of the medicament bottle being exposed to the air, a needle cap covering the needle is detachably sleeved on the medicament bottle, and correspondingly, an end cap capable of removing the needle cap is generally arranged at a distal end of the injection device.

[0003] Specifically, the end cap is at a distal end of the housing and detachably connected with the housing, and the end cap comprises a resilient clamping arm extending into the housing and cooperating with the needle cap, the resilient clamping arm comprises a cantilever extending in an axial direction and a clamping buckle protruding radially inward at an end of the cantilever; correspondingly, the needle cap has a clamping portion cooperating with the clamping buckle. In the process of assembly, the resilient clamping arm of the end cap and the needle cap are close to each other, the clamping buckle on the cantilever is abutted against the outer wall of the needle cap to cause the cantilever to elastically deform outward, and when the clamping buckle moves to a position corresponding to the clamping portion of the needle cap, the cantilever is reset under the action of elastic restoring force, so that the clamping buckle cooperates with the clamping portion to form clamping connection therebetween, and then the user can remove the needle cap by pulling out the end cap.

[0004] However, when the user pulls out the end cap, the clamping buckle on the cantilever is also subjected to a reaction force of the clamping portion of the needle cap, and since the cantilever can elastically deform, the reaction force received by the clamping buckle is transmitted to the cantilever, which can cause the cantilever to deform, which can cause the clamping connection between the resilient clamping arm on the end cap and the needle cap to fail, so that the needle cap is not removed in this process, which causes inconvenience to the removal of the needle cap. SUMMARY

[0005] One of the purposes of the present application is to provide a cartridge containing assembly, which can avoid the situation that the resilient clamping arm is separated from the needle cap due to the reaction of the needle cap when the injection device is actually used, so as to facilitate the user to pull out the end cap from the distal end of the housing while removing the needle cap from the distal end of the medicament bottle.

[0006] The second purpose of the present application is to provide an injection device comprising the cartridge containing assembly provided in one of the above purposes, which facilitates the user to pull out the end cap from the distal end of the housing while removing the needle cap from the distal end of the medicament bottle.

[0007] One of the purposes of the present application adopts the following technical solutions:

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

[0009] a housing for containing a medicament vial, a needle cap being attached to a distal end of the medicament vial and covering a needle;

[0010] an end cap detachably connected to a distal end of the housing, and the end cap comprising a resilient clamping arm capable of forming a clamping connection with the needle cap;

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

[0012] wherein the limiting element is maintained at the first position when the cartridge containing assembly is in an idle state without containing a medicament vial, and the limiting element is maintained at the second position when the cartridge containing assembly is in an assembled state containing a medicament vial and assembled as an injection device;

[0013] when the limiting element is at the first position, the resilient clamping arm is allowed to form a clamping connection with the needle cap or to be disengaged from the clamping connection; when the limiting element is at the second position, the resilient clamping arm is prevented from forming a clamping connection with the needle cap or being disengaged from the clamping connection.

[0014] By adopting the above technical scheme, when the cartridge containing assembly is in an idle state without containing a medicament vial, the limiting element is at the first position, at this time the resilient clamping arm is allowed to form a clamping connection with the needle cap or to be disengaged from the clamping connection, thereby facilitating the user to install the medicament vial into the housing and to make the needle cap at the distal end of the medicament vial cooperate with the resilient clamping arm of the end cap to form a clamping connection; when the cartridge containing assembly is in an assembled state containing a medicament vial and assembled as an injection device, the limiting element is at the second position, at this time the resilient clamping arm is prevented from forming a clamping connection with the needle cap or being disengaged from the clamping connection, thereby facilitating the user to pull out the end cap from the distal end of the housing while removing the needle cap from the distal end of the medicament vial.

[0015] Further, a radial movement distance required for the resilient clamping arm to be elastically deformed radially during forming a clamping connection with the needle cap or being disengaged from the clamping connection is defined as D, the limiting element is provided with a limiting portion, and a radial distance between the limiting portion on the limiting element at the second position and the resilient clamping arm is defined as d, wherein d

[0016] Further, the end cap further comprises a cover body covering the distal end of the housing, the resilient clamping arm comprises a cantilever arm and a clasp on the cantilever arm, the cantilever arm extends axially from the cover body to a proximal end, the clasp extends radially inwardly, and the clasp comprises 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 towards the cover body along the direction in which the clasp extends radially inwardly.

[0017] By adopting the technical scheme, in the process that the elastic clamping arm of the end cover is clamped and connected with the needle cap at the far end of the medicine bottle, the two are axially close to each other, the far end of the needle cap first contacts the second surface of the buckle and relative sliding occurs, so as to facilitate the elastic deformation of the cantilever radially outward.

[0018] Further, the first surface is inclined towards the direction away from the cover body along the direction of the radial extension of the buckle inward.

[0019] The first surface of the buckle is used for clamping the clamping part of the needle cap, and by adopting the technical scheme, when the end cover is pulled out, the first surface of the buckle is biased to the radial direction inward by the reaction force of the clamping part of the needle cap, so that the elastic clamping arm is not easy to elastically deform radially outward.

[0020] Further, the first surface is inclined towards the direction away from the cover body along the direction of the radial extension of the buckle inward.

[0021] By adopting the technical scheme, after the end cap is injection molded, the core can be drawn away from the cover body, and during the core drawing process, the first surface of the buckle is biased to the radial direction outward by the reaction force, so that the elastic clamping arm elastically deforms radially outward, thereby completing the core drawing action.

[0022] Further, the elastic element is used to provide a maintaining force for maintaining the limiting element in the first position, and the elastic element elastically deforms when the limiting element moves from the first position to the second position.

[0023] Further, the end cover is provided with a positioning plane for the needle cap to abut 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 clamping connection.

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

[0025] Further, an axial guide structure is arranged between the limiting element and the end cover, and the axial guide structure is used to guide the relative axial movement of the limiting element and the end cover.

[0026] The second purpose of the present application adopts the following technical scheme:

[0027] The injection device comprises a medicament bottle, a pushing assembly and the cartridge accommodating assembly mentioned above, the medicament bottle is accommodated in the shell, and the needle cap at the distal end of the medicament bottle is in engagement with the elastic clamping arm of the end cap to form a clamping connection, the pushing assembly is in the shell at the side of the proximal end of the medicament bottle, and the pushing assembly is used to provide a maintaining force for maintaining the limiting element in the second position.

[0028] By adopting the technical scheme, the user can pull out the end cap from the distal end of the shell while removing the needle cap from the distal end of the medicament bottle.

[0029] Further, the shell comprises an upper shell and a lower shell which are engaged with 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 and the lower shell are engaged with each other, the pushing assembly provides an external force for moving the limiting element from the first position to the second position.

[0030] In summary, the present application at least has the following beneficial effects:

[0031] When the cartridge accommodating assembly is in an empty state of installing the medicament bottle, the limiting element is in the first position, at this time, the elastic clamping arm is allowed to form a clamping connection with the needle cap or to be disengaged from the clamping connection, thereby facilitating the user to install the medicament bottle into the shell and to make the needle cap at the distal end of the medicament bottle cooperate with the elastic clamping arm of the end cap to form a clamping connection; when the cartridge accommodating assembly is in an assembled state of accommodating the medicament bottle and being assembled into the injection device, the limiting element is in the second position, at this time, the elastic clamping arm is prevented from forming a clamping connection with the needle cap or being disengaged from the clamping connection, thereby facilitating the user to pull out the end cap from the distal end of the shell while removing the needle cap from the distal end of the medicament bottle. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a disassembled view of the cartridge accommodating assembly and the medicament bottle in the embodiment of the present application;

[0033] Figure 2 is a schematic view of the end cap and the needle cap forming a clamping connection in the embodiment of the present application;

[0034] Figure 3 is a schematic view of the cartridge accommodating assembly in which the medicament bottle is not loaded and the limiting element is in the first position in the embodiment of the present application;

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

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

[0037] Figure 6is a schematic diagram showing the radial distance d of the restriction element in the second position in an embodiment of the present application;

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

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

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

[0041] Figure 10 is a schematic diagram showing the structure of the end cap in an embodiment of the present application;

[0042] Figure 11 is a sectional view showing the end cap in an embodiment of the present application;

[0043] Figure 12 is a schematic diagram showing the inner restriction and the axial groove of the restriction element in an embodiment of the present application.

[0044] BRIEF DESCRIPTION OF DRAWINGS 1. housing; 11. inner housing; 12. outer housing; 121. axial guide rib; 13. first chamber; 14. second chamber; 15. axial passage; 2. end cap; 21. elastic clamping arm; 211. cantilever; 212. clasp; 2121. first surface; 2122. second surface; 22. cap body; 23. axial protruding rib; 24. middle column; 241. positioning plane; 3. restriction element; 31. cylindrical main body; 311. axial groove; 32. axial extension arm; 321. guide groove; 33. first section; 34. second section; 341. restriction; 4. cartridge holder; 41. axial guide groove; 42. guide boss; 43. outer wall boss; 5. elastic element; 6. medicament bottle; 7. needle cap; 71. latching portion. DETAILED DESCRIPTION

[0045] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals are used throughout to designate the same or similar elements or elements having the same or similar functions. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and are not to be understood as limiting the present application.

[0046] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first", "second" can be explicitly or implicitly included one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0047] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In order to avoid the needle of the medicament bottle being exposed to the air, a needle cap covering the needle is detachably sleeved on the medicament bottle, and correspondingly, the distal end of the injection device is usually provided with an end cap capable of removing the needle cap. The end cap is at the distal end of the shell and detachably connected with the shell, and the end cap comprises a resilient clamping arm extending into the shell and cooperating with the needle cap, the resilient clamping arm comprises a cantilever extending in the axial direction and a clamping buckle protruding radially inward at the end of the cantilever; correspondingly, the needle cap has a clamping portion cooperating with the clamping buckle. In the process of assembly, the resilient clamping arm of the end cap and the needle cap are close to each other, the clamping buckle on the cantilever abuts against the outer wall of the needle cap to cause elastic deformation of the cantilever outward, and when the clamping buckle moves to a position corresponding to the clamping portion of the needle cap, the cantilever is reset under the action of elastic restoring force, so that the clamping buckle cooperates with the clamping portion to form clamping connection therebetween, and then the user can remove the needle cap by pulling out the end cap. However, when the user pulls out the end cap, the clamping buckle on the cantilever is also subjected to the reaction force of the clamping portion of the needle cap, and since the cantilever can be elastically deformed, the reaction force acting on the clamping buckle is transmitted to the cantilever, which can cause deformation of the cantilever, which can cause the clamping connection between the resilient clamping arm on the end cap and the needle cap to fail, so that the needle cap is not removed in this process.

[0049] The embodiment of the present application discloses a cartridge accommodating assembly which is an assembled component of an injection device, and can avoid the situation that the elastic clamping arm 21 is 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 pull out the end cover 2 from the distal end of the shell 1 while removing the needle cap 7 from the distal end of the medicine bottle 6.

[0050] It should be noted that the cartridge accommodating assembly involved in the present application can accommodate the medicine bottle 6, and after accommodating the medicine bottle 6, the cartridge accommodating assembly can be assembled with other components to form an injection device for the user to inject medicine; at the same time, the aforementioned medicine bottle 6 includes a bottle body, medicine placed in the bottle body, a needle at the distal end of the bottle body, and a movable piston at the proximal end of the bottle body. At the same time, in the embodiment of the present application, the proximal end 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 embodiment, 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 of the cartridge accommodating assembly before accommodating the medicine bottle 6 is defined as the empty state of the cartridge accommodating assembly, and the state of the cartridge accommodating assembly after accommodating the medicine bottle 6 and being assembled with other components to form an injection device is defined as the assembled state of the cartridge accommodating assembly.

[0052] Referring to Figures 1 to 4 , the cartridge accommodating assembly includes a shell 1, an end cover 2 and a limiting element 3, wherein the shell 1 is substantially cylindrical and has opposite distal and proximal ends, the shell 1 is used to accommodate the medicine bottle 6, and the distal end of the medicine bottle 6 is connected with the 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 end opening of the shell 1, and at the same time, the end cover 2 includes an elastic clamping arm 21 which can be matched with the needle cap 7 to form a clamping connection. In addition, the limiting element 3 is in the shell 1 and can be moved relative to the shell 1 from the first position to the second position under the action of external force. Wherein, Figure 3 is a schematic view of the cartridge accommodating assembly without loading the medicine bottle 6 and the limiting element 3 being in the first position, which corresponds to the empty state of the cartridge accommodating assembly described above; Figure 4 is a schematic view of the cartridge accommodating assembly with the medicine bottle 6 loaded and the limiting element 3 being in the first position, and the cartridge accommodating assembly in this state can be used for further assembly with other components; Figure 5 is a schematic view of the cartridge accommodating assembly with the medicine bottle 6 loaded and the limiting element 3 being in the second position, and the limiting element 3 in this state can be locked with the shell 1 to maintain in the second position, or can be maintained in the second position by other components not shown for assembling the injection device, and also corresponds to the assembled state of the cartridge accommodating assembly described above.

[0053] Referring to Figures 3 to 5When the cartridge containing assembly is in the idle state, the limiting element 3 is in a first position relative to the housing 1; when the cartridge containing assembly is in the assembled state, the limiting element 3 is in a second position relative to the housing 1. And the radial active distance required for the elastic clamping arm 21 to be elastically deformed radially when the elastic clamping arm 21 is in engagement or disengagement with the needle cap 7 is defined as D, and the foregoing means that the radial active distance required for the elastic clamping arm 21 to be elastically deformed radially when the elastic clamping arm 21 is in engagement with the needle cap 7 is at least D, and also means that the radial active distance required for the elastic clamping arm 21 to be elastically deformed radially when the elastic clamping arm 21 is disengaged from the needle cap 7 is at least D.

[0054] Correspondingly, with reference to Figure 3 and Figure 4 When the limiting element 3 is in the first position, the elastic clamping arm 21 is allowed to be elastically deformed radially by a radial active distance d1, d1≥D, that is, the elastic clamping arm 21 is allowed to be in engagement or disengagement with the needle cap 7; so that in the idle state of the cartridge containing assembly, the medicament bottle 6 can be installed into the housing 1 and the needle cap 7 at the distal end of the medicament bottle 6 is in engagement with the elastic clamping arm 21 of the end cap 2.

[0055] With reference to Figure 5 and Figure 6 When the limiting element 3 is in the second position, the elastic clamping arm 21 is prevented from being elastically deformed radially by a radial active distance d2, d2<D, that is, the elastic clamping arm 21 is prevented from being in engagement or disengagement with the needle cap 7; so that in the assembled state of the cartridge containing assembly assembled into the injection device, the needle cap 7 at the distal end of the medicament bottle 6 can maintain stable engagement with the elastic clamping arm 21 of the end cap 2, so that the user can pull out the end cap 2 from the distal end of the housing 1 while removing the needle cap 7 from the distal end of the medicament bottle 6.

[0056] It can be understood that in the process of the elastic clamping arm 21 being in engagement with the needle cap 7 and the process of the elastic clamping arm 21 being disengaged from the needle cap 7, the elastic clamping arm 21 will be elastically deformed radially, and the radial active distance required for the elastic clamping arm 21 to be elastically deformed radially during engagement and disengagement is the same, which is defined as D in the foregoing.

[0057] It should be noted that the movement of the limiting element 3 from the first position to the second position relative to the housing 1 indicates that the limiting element 3 can change its position relative to the housing 1, without limiting the specific movement form of the limiting element 3 relative to the housing 1. In the embodiment, the limiting element 3 is configured to be axially translated relative to the housing 1 to move from the first position to the second position; in some other specific embodiments, the limiting element 3 is configured to be helically moved relative to the housing 1 to move from the first position to the second position; in some other specific embodiments, the limiting element 3 is configured to be rotated relative to the housing 1 to move from the first position to the second position. Meanwhile, in the specific embodiments in which the limiting element 3 is axially translated or helically moved 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 towards the end cover 2; in some 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 can be understood that the housing 1 is used to accommodate the medicine bottle 6, which can be configured to have an internal size of the housing 1 matched with the medicine bottle 6, or other built-in components added in the housing 1 matched with the external diameter of the medicine bottle 6.

[0059] Referring to Figure 1 and Figure 7 In some embodiments, the housing 1 includes an inner housing 11 and an outer housing 12, and the inner housing 11 has an inner cavity for defining the position of the medicine bottle 6 in the housing 1. It can be understood that in some specific examples, the inner cavity can be configured to be matched with the external wall of the medicine bottle 6, so that the inner cavity of the inner housing 11 directly defines the position of the medicine bottle 6 in the housing 1; or the inner cavity can be configured to be larger than the external wall of the medicine bottle 6, and other components are added between the inner cavity and the medicine bottle 6 to define the position of the medicine bottle 6 in the housing 1.

[0060] In combination with Figure 1 and Figure 7 In some specific examples, the cartridge accommodating assembly further includes a cartridge holder 4 arranged in the inner cavity of the inner housing 11, and the cartridge holder 4 is generally in a cylindrical structure, and the outer wall of the cartridge holder 4 is matched with the inner wall of the inner housing 11 in size, and the inner wall of the cartridge holder 4 is matched with the external wall of the medicine bottle 6 in size, so as to define the position of the medicine bottle 6 in the housing 1.

[0061] Meanwhile, in some examples of the above embodiments, the limiting element 3 can be axially translated relative to the housing 1, which can be directly or indirectly axially guided relative to the housing 1.

[0062] Referring to Figure 7, the outer wall of the inner shell 11 is connected with the inner wall of the outer shell 12 through 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 symmetrical inner edges forms two axial passages 15 between the first chamber 13 and the second chamber 14; accordingly, in combination with Figure 8 , the limiting element 3 is a long strip structure extending in the axial direction, and the limiting element 3 comprises a cylindrical body 31 and two symmetrical axial extension arms 32 extending axially from the proximal end of the cylindrical body 31, and the axial extension arms 32 pass through the axial passages 15 from the second chamber 14 at the distal end to the first chamber 13 at the proximal end, and the abutment of the inner edges with the proximal end face of the cylindrical body 31 limits the maximum position of the limiting element 3 that can move proximally relative to the shell 1. In some specific examples, the axial guiding cooperation between the limiting element 3 and the shell 1 can be achieved by the cooperation of the axial extension arms and the axial passages 15.

[0063] Referring to Figure 1 , in some more specific examples, the limiting element 3 indirectly forms an axial guiding cooperation with the shell 1 through the cartridge holder 4. In combination with Figure 8 and Figure 9 , the proximal end outer wall of the cartridge holder 4 is provided with an axially extending axial guiding groove 41, and the proximal end inner wall of the outer shell 12 is provided with an axial guiding rib 121 capable of being embedded in the axial guiding groove 41, and the cooperation of the axial guiding groove 41 and the axial guiding rib 121 forms the axial guiding cooperation between the cartridge holder 4 and the shell 1. At the same time, the outer wall of the section of the cartridge holder 4 between the proximal end and the distal end is provided with an outwardly radially extending guide boss 42, and the limiting element 3 comprises two symmetrical axial extension arms 32 having guide grooves 321 cooperating with the guide boss 42, so as to realize the axial guiding cooperation between the cartridge holder 4 and the limiting element 3. In addition, in this embodiment, the two ends of the extension direction of the guide groove 321 are closed, so as to realize the farthest end and the nearest end of the relative axial movement of the limiting element 3 and the cartridge holder 4; 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 move away 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, indicating that the limiting element 3 directly or indirectly forms a resilient connection with the shell 1, so that the limiting element 3 can be maintained in the first position by the elastic force, and when the limiting element 3 is subjected to an external force, the elastic element in the resilient connection can be elastically deformed to allow the limiting element 3 to change position.

[0065] Referring to Figure 1 , Figures 7 to 9 In some embodiments in which the restriction element 3 axially translates relative to the housing 1, the medicament containing assembly further comprises a resilient element 5, which is an axially extending straight spring, the distal end of the resilient element 5 abuts against the proximal end face of the inner housing 11, the proximal end of the spring element abuts against the outer wall boss 43 of the cartridge holder 4, and the resilient force of the resilient element 5 is transmitted to the restriction element 3 for maintaining the restriction element 3 in the first position relative to the housing 1 through the abutment of the guiding boss 42 on the cartridge holder 4 and the proximal slot wall of the guiding groove 321 of the axially extending arm 32 on the restriction element 3; meanwhile, when the restriction element 3 is subjected to an external force towards the distal end, the restriction element 3 drives the cartridge holder 4 to move distally together and compresses the resilient element 5, so that the restriction element 3 can move from the first position to the second position closer to the distal end.

[0066] Further, referring to Figure 10 and Figure 11 In some embodiments, the end cap 2 further comprises a cap body 22 which caps the distal end of the housing 1, and the resilient clamping arms 21 are two, each of which comprises a cantilever arm 211 which axially extends proximally from the cap body 22 and a clasp 212 which is on the cantilever arm 211. Referring to Figures 3 to 5 For the convenience of subsequent description, the area in which the cantilever arm 211 and the clasp 212 are located when the end cap 2 is installed at the distal end of the housing 1 is the clamping active area; the restriction element 3 is annularly arranged outside the resilient clamping arms 21 of the end cap 2, and an axial guiding structure is arranged between the restriction element 3 and the end cap 2 for guiding the relative movement between the restriction element 3 and the end cap 2. Referring to Figure 10 and Figure 12 The distal end inner wall of the restriction element 3 is provided with an axial groove 311, and correspondingly, the outer wall of the resilient clamping arm 21 of the end cap 2 is provided with an axial rib 23 which cooperates with the axial groove 311, so as to realize the axial guiding structure between the restriction element 3 and the end cap 2.

[0067] Referring to Figure 4 and Figure 5 The restriction element 3 comprises a first section 33 and a second section 34 which are distributed along the axial direction; when the restriction element 3 is in the first position, the first section 33 of the restriction element 3 is located at the radial periphery of the clamping active area, and the radial distance between the inner wall of the first section 33 and the resilient clamping arm 21 is d3, d3≥D, so that the resilient clamping arm 21 is allowed to form a clamping connection with or disengage from the needle cap 7; when the restriction element 3 is in the second position, the second section 34 of the restriction element 3 is located at the radial periphery of the clamping active area; in combination with Figure 12The inner wall of the second section 34 is provided with a limiting portion 341 corresponding to the position of the buckle 212. The limiting portion 341 is configured as a protrusion extending radially inwardly, 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 being engaged with or disengaged from the needle cap 7.

[0068] With reference to Figure 11 The buckle 212 extends radially inwardly, and the buckle 212 includes axially opposite first and second surfaces 2121 and 2122. 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 cover body 22 along the direction in which the buckle 212 extends radially inwardly. Correspondingly, in combination with Figure 2 The proximal end surface of the needle cap 7 serves as an engagement portion 71 engaged with the buckle 212. During the engagement of the needle cap 7 with the end cap 2, the elastic clamping arm 21 of the end cap 2 approaches the needle cap 7, and the buckle 212 on the cantilevered arm 211 abuts against the outer wall of the needle cap 7, so that the cantilevered arm 211 elastically deforms radially outwardly. When the buckle 212 moves to a position corresponding to the engagement portion 71 of the needle cap 7, the cantilevered arm 211 is reset under the elastic restoring force, so that the buckle 212 is engaged with the engagement portion 71 to form the engagement therebetween. Further, in some specific examples, the end cap 2 is further provided with a middle column 24, and the distal end surface of the middle column 24 serves as a positioning plane 241 for abutting against the needle cap 7 to limit the axial position of the end cap 2 relative to the needle cap 7. When the positioning plane 241 abuts against the needle cap 7, the buckle 212 is positioned corresponding to the engagement portion 71 of the needle cap 7, so as to achieve the engagement between the elastic clamping arm 21 of the end cap 2 and the needle cap 7.

[0069] Further, when the elastic clamping arm 21 of the end cap 2 is engaged with the needle cap 7, the second surface 2122 of the buckle 212 abuts against the engagement portion 71. When the user pulls the end cap 2 relative to the housing 12 to the distal end, the second surface 2122 of the buckle 212 transmits a force to the engagement portion 71 of the needle cap 7, so as to pull the needle cap 7 synchronously. Further, in some examples, the first surface 2121 is inclined away from the cover body 22 along the direction in which the buckle 212 extends radially inwardly, so that the first surface 2121 of the buckle 212 is biased to point radially inwardly under the reaction force of the engagement portion 71 of the needle cap 7, and thus the elastic clamping arm 21 is less likely to elastically deform radially outwardly. In other examples, the first surface 2121 is inclined toward the cover body 22 along the direction in which the buckle 212 extends radially inwardly, so as to facilitate the injection molding core pulling of the end cap 2.

[0070] The injection device disclosed in the examples of the present application facilitates the user to pull the end cap 2 from the distal end of the housing 1 while removing the needle cap 7 from the distal end of the medicament bottle 6.

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

[0072] In some embodiments, the housing 1 of the injection device is of an integral structure, and in the actual assembly process, the end cap 2 and the limiting element 3 are first installed at the distal end of the housing 1 to form the cartridge accommodating assembly as mentioned above in the idle state, then the medicament bottle 6 is assembled into the housing 1 from the proximal end of the housing 1, and then the pushing assembly is assembled into the housing 1 from the proximal end of the housing 1, and the pushing assembly is used to push the limiting element 3 to move from the first position to the second position during the installation process, and finally the proximal end of the housing 1 is closed to obtain the injection device.

[0073] In other embodiments, the housing 1 of the injection device is of a split structure, i.e. the housing 1 comprises an upper housing and a lower housing which are in abutment, and in the actual assembly process, the end cap 2 is installed at the distal end of the lower housing, the limiting element 3 is installed in the lower housing to form the cartridge accommodating assembly as mentioned above in the idle state, and the pushing assembly is installed in the upper housing to form an upper assembly; then the medicament bottle 6 is assembled into the lower housing from the proximal end of the lower housing, and then the upper assembly is abutted with the cartridge accommodating assembly, and in the abutment process, 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 preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A cartridge containing assembly for an injection device, characterized in that, The cartridge accommodating assembly comprises: a housing for accommodating a medicament cartridge, the medicament cartridge having a needle cap covering a needle at a distal end of the medicament cartridge; a cap removably connected to a distal end of the housing, the cap comprising a resilient clamping arm configured to form a clamping connection with the needle cap; a limiting element disposed in the housing and movable relative to the housing from a first position to a second position; wherein the limiting element is maintained at the first position when the cartridge accommodating assembly is in an idle state without accommodating the medicament cartridge, and the limiting element is maintained at the second position when the cartridge accommodating assembly is in an assembled state of accommodating the medicament cartridge and being assembled into an injection device; when the limiting element is at the first position, the resilient clamping arm is allowed to form the clamping connection with the needle cap or to be disengaged from the clamping connection; when the limiting element is at the second position, the resilient clamping arm is prevented from forming the clamping connection with the needle cap or being disengaged from the clamping connection.

2. The cartridge containing assembly according to claim 1, characterized in that, A radial movement distance required for the resilient clamping arm to be elastically deformed radially during the resilient clamping arm forming the clamping connection with the needle cap or being disengaged from the clamping connection is defined as D, the limiting element is provided with a limiting portion, and a radial distance between the limiting portion on the limiting element at the second position and the resilient clamping arm is defined as d, wherein d 3. The cartridge containment assembly of claim 1, wherein, The cap further comprises a cover body covering the distal end of the housing, the resilient clamping arm comprises a cantilever arm and a clasp on the cantilever arm, the cantilever arm extends axially proximally from the cover body, the clasp extends radially inwardly, and the clasp comprises first and second axially opposite surfaces, the first surface is closer to the cover body than the second surface; the second surface is inclined toward the cover body along a direction in which the clasp extends radially inwardly.

4. The cartridge containing assembly of claim 3, wherein, The first surface is inclined toward the cover body along a direction in which the clasp extends radially inwardly.

5. The cartridge containment assembly of claim 3, wherein, The first surface is inclined away from the cover body along a direction in which the clasp extends radially inwardly.

6. The cartridge containment assembly of claim 1, wherein, Further comprising an elastic element for providing a maintaining force for maintaining the limiting element at the first position, and the elastic element is elastically deformed when the limiting element moves from the first position to the second position.

7. The cartridge containment assembly of claim 1, wherein, The cap is provided with a positioning plane for abutting against the needle cap to define an axial position of the cap and the needle cap, and the resilient clamping arm forms the clamping connection with the needle cap when the positioning plane abuts against the needle cap.

8. The cartridge containment assembly of claim 1, wherein, The limiting element at the first position is farther away from the cap than the limiting element at the second position.

9. The cartridge containment assembly of claim 1, wherein, An axial guide structure is provided between the limiting element and the cap for guiding the limiting element to move axially relative to the cap.

10. An injection device, characterized in that The cartridge accommodating assembly comprises a medicament cartridge, a pushing assembly, and any one of the cartridge accommodating assemblies according to claims 1 to 9, the medicament cartridge is accommodated in the housing, a needle cap at a distal end of the medicament cartridge is in clamping connection with the resilient clamping arm of the cap, the pushing assembly is in the housing on a proximal side of the medicament cartridge, and the pushing assembly is configured to provide a maintaining force for maintaining the limiting element at the second position.

Images