CN220090141U - Pen core support for injection pen, injection pen shell assembly and injection pen - Google Patents

Abstract

The utility model discloses a pen refill holder for an injection pen, an injection pen shell assembly and an injection pen, wherein the pen refill holder for the injection pen comprises: a holder sleeve provided with a first receiving passage penetrating in an axial direction thereof, the first receiving passage being adapted to receive a cartridge and define a position of the cartridge in a radial direction of the holder sleeve; the limiting piece is detachably arranged at the first end of the support sleeve, the limiting piece is provided with a plurality of limiting grooves extending along the radial direction of the support sleeve, the limiting grooves are distributed at intervals along the axial direction of the support sleeve, the limiting grooves are suitable for accommodating flanging of the refill, and the limiting grooves are matched with the flanging to limit the position of the refill in the axial direction of the support sleeve. According to the pen refill support for the injection pen, the plurality of limiting grooves can provide mounting positions for pen refills of different sizes, the pen refill support can be suitable for pen refills of different sizes, and the applicability of the injection pen can be improved.

Description

Pen core support for injection pen, injection pen shell assembly and injection pen

Technical Field

The utility model belongs to the technical field of medical equipment, and particularly relates to a pen core support for an injection pen, an injection pen shell assembly and an injection pen.

Background

The injection pen is a common medical appliance, is mainly used for injecting liquid medicine or drawing liquid, and can accurately extrude required dosage. In the existing injection pen, the pen core support structure of the injection pen is single, only one size pen core can be installed, the injection pen cannot be suitable for pen cores of different sizes, and the single injection pen has low applicability. When the sizes of the pen cores are different, the corresponding injection pen needs to be replaced, and the use cost is high.

Disclosure of Invention

The utility model aims to provide a new technical scheme of a pen core support for an injection pen, which at least can solve the technical problem of low applicability caused by the fact that the existing injection pen cannot be provided with pen cores of different sizes.

It is yet another object of the present utility model to provide an injection pen housing assembly comprising the above cartridge holder for an injection pen.

It is a further object of the present utility model to provide an injection pen comprising an injection pen housing assembly as described above.

According to a first aspect of the present utility model, there is provided a cartridge holder for an injection pen, comprising: a holder sleeve provided with a first receiving passage penetrating in an axial direction thereof, the first receiving passage being adapted to receive a cartridge and define a position of the cartridge in a radial direction of the holder sleeve; the limiting piece is detachably arranged at the first end of the support sleeve, the limiting piece is provided with a plurality of limiting grooves extending in the radial direction of the support sleeve, the limiting grooves are distributed at intervals in the axial direction of the support sleeve, the limiting grooves are suitable for accommodating flanging of the pencil lead, and the limiting grooves are matched with the flanging of the pencil lead to limit the position of the pencil lead in the axial direction of the support sleeve.

According to the cartridge support for the injection pen, disclosed by the embodiment of the utility model, the cartridge can be limited in the radial direction of the support sleeve through the first accommodating channel, the plurality of limiting grooves formed in the limiting piece can provide mounting positions for cartridges of different sizes in the axial direction of the support sleeve, the cartridges can be limited in the axial direction of the support sleeve through the limiting grooves, and the corresponding limiting grooves can be selected for mounting according to the sizes of the cartridges when the cartridge support is used, so that the cartridge support can be suitable for cartridges of different sizes, the applicability of the injection pen can be improved, and the use cost can be reduced.

According to one embodiment of the present utility model, the stopper is formed in a tubular structure, and the stopper includes: the first end of the first arc-shaped limiting plate is detachably connected with the bracket sleeve; the first end of the second arc-shaped limiting plate is detachably connected with the support sleeve, and the limiting grooves are formed in the first arc-shaped limiting plate and/or the second arc-shaped limiting plate; the first arc-shaped limiting plate and the second arc-shaped limiting plate define a second accommodating channel extending along the axial direction of the support sleeve, and the second accommodating channel is suitable for accommodating the pen core and limiting the position of the pen core in the radial direction of the support sleeve.

According to one embodiment of the utility model, the first end of the first arc-shaped limiting plate is provided with a first inserting part, the first end of the second arc-shaped limiting plate is provided with a second inserting part, and the first inserting part and the second inserting part are respectively inserted into the first end of the first accommodating channel.

According to one embodiment of the utility model, the inner side of the first arc-shaped limiting plate and the inner side of the second arc-shaped limiting plate are respectively provided with the limiting grooves, and the limiting grooves on the first arc-shaped limiting plate and the limiting grooves on the second arc-shaped limiting plate are axially spaced from each other in the support sleeve.

According to one embodiment of the utility model, the first end of the bracket sleeve is provided with at least one connecting arm extending along the axial direction of the first end, the outer side of the first arc-shaped limiting plate and/or the outer side of the second arc-shaped limiting plate is provided with a connecting groove, and the connecting arm is matched with the connecting groove to limit the rotation of the first arc-shaped limiting plate and the second arc-shaped limiting plate.

According to one embodiment of the utility model, the limiting groove is communicated with the connecting groove, and the inner side of the connecting arm is matched with the flanging of the refill to limit the refill to rotate.

According to one embodiment of the utility model, a part of the connecting groove is located on the first arc-shaped limiting plate, and another part of the connecting groove is located on the second arc-shaped limiting plate.

According to one embodiment of the utility model, the outer side of the connecting arm is provided with a clamping portion formed as a projection extending obliquely towards the carrier sleeve, the projection being intended to cooperate with the housing of the injection pen to define the position of the carrier sleeve.

According to a second aspect of the present utility model, there is provided an injection pen housing assembly comprising a cartridge holder for an injection pen according to any of the embodiments described above.

According to a third aspect of the present utility model there is provided an injection pen comprising an injection pen housing assembly as described in the above embodiments.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a structural exploded view of a cartridge holder according to an embodiment of the present utility model;

fig. 2 is a perspective view of a cartridge holder according to an embodiment of the present utility model;

fig. 3 is a top view of a cartridge holder according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

fig. 5 is a schematic structural view of a stopper of a cartridge holder according to an embodiment of the present utility model;

fig. 6 is a schematic structural view of a first arc-shaped limiting plate of a cartridge holder according to an embodiment of the present utility model;

FIG. 7 is a schematic view of an internal structure of an injection pen according to an embodiment of the present utility model;

fig. 8 is an enlarged schematic view at B in fig. 7.

Reference numerals:

cartridge holder 100;

a bracket sleeve 10; a connecting arm 11; a clamping part 111;

a stopper 20; a limit groove 21; a first arc-shaped limiting plate 22; a first plug portion 221; a second arc-shaped limiting plate 23; a second socket 231; a connecting groove 24;

an injection pen 200; a housing 210; a clamping groove 211.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

A cartridge holder 100 for an injection pen according to an embodiment of the present utility model is described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 6, a cartridge holder 100 for an injection pen according to an embodiment of the present utility model includes: a bracket sleeve 10 and a stop 20.

Specifically, the support sleeve 10 is provided with a first accommodating channel penetrating along an axial direction thereof, the first accommodating channel is suitable for accommodating the pen refill and limiting the position of the pen refill in a radial direction of the support sleeve 10, the limiting piece 20 is detachably arranged at a first end of the support sleeve 10, the limiting piece 20 is provided with a plurality of limiting grooves 21 extending along the radial direction of the support sleeve 10, the plurality of limiting grooves 21 are distributed at intervals along the axial direction of the support sleeve 10, the limiting grooves 21 are suitable for accommodating turned edges of the pen refill, and the limiting grooves 21 are matched with the turned edges of the pen refill to limit the position of the pen refill in the axial direction of the support sleeve 10.

In other words, as shown in fig. 1 to 6, the cartridge holder 100 for an injection pen according to the embodiment of the present utility model is mainly composed of a holder sleeve 10 and a stopper 20, wherein the holder sleeve 10 may be formed in a cylindrical structure, the holder sleeve 10 is provided with a first receiving passage provided therethrough in an axial direction, in this embodiment, the first receiving passage may receive a cartridge and may define a position of the cartridge in a radial direction of the holder sleeve 10, the stopper 20 is detachably connected to a first end of the holder sleeve 10, for example, the stopper 20 is connected to the holder sleeve 10 through a connecting member, the stopper 20 is clamped to the holder sleeve 10, and the stopper 20 is inserted into the holder sleeve 10, and a specific connection manner thereof is not limited in the embodiment.

As shown in fig. 5 and 6, a plurality of limiting grooves 21 are provided on one side of the limiting member 20 near the axis of the holder sleeve 10, the limiting grooves 21 extend along the radial direction of the holder sleeve 10, so that the limiting grooves 21 are formed as notches suitable for the insertion of the flange of the cartridge, and the plurality of limiting grooves 21 are distributed on the limiting member 20 at intervals along the axial direction of the holder sleeve 10, the number of the limiting grooves 21 and the distance between the adjacent limiting grooves 21 can be determined according to the size and actual requirements of the cartridge, and the embodiment is not limited.

As shown in fig. 1, when the cartridge is mounted, the stopper 20 is separated from the holder sleeve 10, a user can select a corresponding stopper groove 21 according to the size of the cartridge to mount, the stopper groove 21 can limit the position of the cartridge in the axial direction of the holder sleeve 10, and then the stopper 20 is connected with the first end of the holder sleeve 10 so that the cartridge passes through the first receiving channel, and the first receiving channel limits the cartridge in the radial direction of the holder sleeve 10, thereby limiting the position of the cartridge under the action of the stopper groove 21 and the first receiving channel.

Therefore, according to the cartridge holder 100 for an injection pen of the embodiment of the present utility model, the cartridge holder 100 for an injection pen can be limited in the radial direction of the holder sleeve 10 through the first accommodating channel, the plurality of limiting grooves 21 provided on the limiting member 20 can provide mounting positions for cartridges of different sizes in the axial direction of the holder sleeve 10, and the cartridges can be limited in the axial direction of the holder sleeve 10 through the limiting grooves 21, and when in use, the corresponding limiting grooves 21 can be selected according to the sizes of the cartridges to mount, so that the cartridge holder 100 can be suitable for cartridges of different sizes, the applicability of the injection pen 200 can be improved, and the use cost can be reduced.

According to one embodiment of the present utility model, the stopper 20 is formed in a tubular structure, and the stopper 20 includes: the first arc limiting plate 22, the first end of the first arc limiting plate 22 is detachably connected with the bracket sleeve 10; the first end of the second arc-shaped limiting plate 23 is detachably connected with the support sleeve 10, and the first arc-shaped limiting plate 22 and/or the second arc-shaped limiting plate 23 are/is provided with limiting grooves 21; the first and second arc-shaped limiting plates 22 and 23 define a second receiving passage extending in the axial direction of the holder sleeve 10, the second receiving passage being adapted to receive the cartridge and define the position of the cartridge in the radial direction of the holder sleeve 10.

That is, as shown in fig. 1 to 6, the stopper 20 is mainly composed of a first arc-shaped stopper plate 22 and a second arc-shaped stopper plate 23, the first end of the first arc-shaped stopper plate 22 and the first end of the second arc-shaped stopper plate 23 are detachably connected with the holder sleeve 10, respectively, and the first arc-shaped stopper plate 22 and the second arc-shaped stopper plate 23 enclose to form a tubular structure such that the first arc-shaped stopper plate 22 and the second arc-shaped stopper plate 23 define a second accommodation channel penetrating in the axial direction of the holder sleeve 10, which can be coaxially disposed with the first accommodation channel, and the position of the cartridge is defined in the radial direction of the holder sleeve 10 by the second accommodation channel.

As shown in fig. 4, the limiting groove 21 is disposed in the second accommodating channel, which may specifically include, but is not limited to, the following three cases: in the first case, a plurality of limiting grooves 21 are respectively arranged on a first arc limiting plate 22; in the second case, the plurality of limiting grooves 21 are respectively arranged on the second arc limiting plate 23; in the third case, a part of the limiting grooves 21 are formed in the first arc-shaped limiting plate 22, and the other part of the limiting grooves 21 are formed in the second arc-shaped limiting plate 23.

The specific position of the limiting groove 21 can be determined according to the specific structure and actual requirement of the pen core, and is not limited in this embodiment.

In some embodiments of the present utility model, the first end of the first arc-shaped limiting plate 22 is provided with a first plugging portion 221, the first end of the second arc-shaped limiting plate 23 is provided with a second plugging portion 231, and the first plugging portion 221 and the second plugging portion 231 are plugged into the first end of the first accommodating channel respectively.

Specifically, as shown in fig. 1 and 4, the first end of the first arc-shaped limiting plate 22 is provided with a first plugging portion 221, the cross section of the first plugging portion 221 may be formed into a semicircle, the first end of the second arc-shaped limiting plate 23 is provided with a second plugging portion 231, and the cross section of the second plugging portion 231 may also be formed into a semicircle, so that the first plugging portion 221 and the second plugging portion 231 may enclose into a circular tube structure, and the outer diameter of the circular tube structure is approximately the same as the radial dimension of the first end side of the first accommodating channel, so that the first plugging portion 221 and the second plugging portion 231 may be plugged into the first end of the first accommodating channel, which is convenient for installation.

In this embodiment, the first plugging portion 221 may be integrally formed with the first arc-shaped limiting plate 22, and the second plugging portion 231 may be integrally formed with the second arc-shaped limiting plate 23, which has a simple structure and is convenient for manufacturing.

Optionally, the outer circumferential surface of the first plugging portion 221 and the outer circumferential surface of the second plugging portion 231 are respectively provided with a clamping table, the first accommodating channel is provided with a matching portion, and the clamping table can be clamped with the matching portion to fix the positions of the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23.

According to one embodiment of the present utility model, the inner sides of the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23 are respectively provided with a limiting groove 21, and the limiting groove 21 positioned on the first arc-shaped limiting plate 22 and the limiting groove 21 positioned on the second arc-shaped limiting plate 23 are spaced apart in the axial direction of the bracket sleeve 10.

That is, as shown in fig. 4 and 5, at least one limiting groove 21 is provided on the inner side of the first arc-shaped limiting plate 22, at least one limiting groove 21 is also provided on the inner side of the second arc-shaped limiting plate 23, and when the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23 are respectively provided with one limiting groove 21, the limiting grooves 21 on the first arc-shaped limiting plate 22 and the limiting grooves 21 on the second arc-shaped limiting plate 23 are spaced apart in the axial direction of the holder sleeve 10 to provide mounting positions for cartridges of different sizes.

It should be noted that, the pen core may be divided into a pen core with a single-side flanging and a pen core with double-side flanging, when the pen core is in a single-side flanging structure, the limiting groove 21 on the first arc limiting plate 22 may be staggered with the limiting groove 21 deleted by the second arc limiting plate 23, and when the pen core is in a double-side flanging structure, the limiting groove 21 on the first arc limiting plate 22 corresponds to the limiting groove 21 on the second arc limiting plate 23.

In some embodiments of the present utility model, the first end of the bracket sleeve 10 is provided with at least one connecting arm 11 extending along the axial direction thereof, and the outer side of the first arc-shaped limiting plate 22 and/or the outer side of the second arc-shaped limiting plate 23 is provided with a connecting groove 24, and the connecting arm 11 cooperates with the connecting groove 24 to limit the rotation of the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23.

Specifically, as shown in fig. 1 and 2, the first end of the bracket sleeve 10 is provided with a connecting arm 11 extending in the axial direction thereof, at least one of the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23 is provided with a connecting groove 24 extending in the axial direction of the bracket sleeve 10, the connecting groove 24 corresponds to the position of the connecting arm 11, and the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23 can be prevented from rotating relative to the bracket sleeve 10 by the cooperation of the connecting arm 11 and the connecting groove 24.

According to one embodiment of the utility model, the limiting groove 21 is communicated with the connecting groove 24, and the inner side of the connecting arm 11 is matched with the flanging of the pen core to limit the rotation of the pen core.

As shown in fig. 5 and 6, in the present embodiment, the limit groove 21 communicates with the connection groove 24 so that the inner side of the connection arm 11 can be in contact with the flange of the cartridge, thereby preventing the cartridge from rotating about the axis of the holder sleeve 10 under the action of the connection arm 11 and thus preventing the injection needle connected to the cartridge from rotating.

In some embodiments of the present utility model, a portion of the limiting groove 21 is located at the first arc-shaped limiting plate 22, and another portion of the limiting groove 21 is located at the second arc-shaped limiting plate 23.

That is, as shown in fig. 2 and 5, the connecting arm 11 is located between the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23, the outer circumferential surfaces of the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23 are provided with the connecting groove 24 corresponding to the connecting arm 11, the connecting arm 11 is located in the connecting groove 24, the connecting arm 11 can connect the first arc-shaped limiting plate 22 and the second arc-shaped limiting plate 23, and the stability of the cartridge holder 100 can be improved.

According to one embodiment of the utility model, the outer side of the connecting arm 11 is provided with a snap-in portion 111, the snap-in portion 111 being formed as a projection extending obliquely towards the holder sleeve 10 for cooperation with the housing 210 of the injection pen 200 to define the position of the holder sleeve 10.

Specifically, as shown in fig. 2 and 8, the outer side of the connecting arm 11 is provided with a clamping portion 111, the housing 210 of the injection pen 200 is provided with a clamping groove 211 corresponding to the clamping portion 111, and the clamping portion 111 can be clamped in the clamping groove 211, so that the bracket sleeve 10 is conveniently fixed in the housing of the injection pen 200, the assembly of the injection pen 200 is more convenient, and the assembly efficiency of the injection pen 200 can be improved.

In summary, according to the cartridge holder 100 for an injection pen of the embodiment of the present utility model, the cartridge can be limited in the radial direction of the holder sleeve 10 through the first receiving channel, the plurality of limiting grooves 21 provided on the limiting member 20 can provide mounting positions for cartridges of different sizes in the axial direction of the holder sleeve 10, and the cartridges can be limited in the axial direction of the holder sleeve 10 through the limiting grooves 21, and when in use, the corresponding limiting grooves 21 can be selected for mounting according to the size of the cartridge, so that the cartridge holder 100 can be suitable for cartridges of different sizes, and the applicability of the injection pen 200 can be improved.

Embodiments of the present utility model also provide an injection pen housing assembly comprising the cartridge holder 100 for an injection pen described in any of the embodiments above. Since the pen core holder 100 for an injection pen according to the embodiment of the present utility model can solve the technical problem that the existing injection pen 200 cannot mount pen cores with different sizes and has low applicability, the injection pen housing assembly according to the embodiment of the present utility model also has the above advantages, and will not be described herein.

As shown in FIGS. 7 and 8, embodiments of the present utility model further provide an injection pen 200 including the injection pen housing assembly described in the above embodiments. Since the injection pen housing assembly according to the embodiment of the present utility model can solve the technical problem that the existing injection pen 200 cannot be installed with pen cores of different sizes and has low applicability, the injection pen 200 according to the embodiment of the present utility model also has the above advantages and will not be described herein.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A refill holder for an injection pen, comprising:

-a support sleeve (10), said support sleeve (10) being provided with a first containing channel extending axially therethrough, said first containing channel being adapted to contain a cartridge and defining the position of said cartridge in the radial direction of said support sleeve (10);

the limiting piece (20), locating piece (20) detachably locates the first end of support sleeve (10), limiting piece (20) are equipped with a plurality of edges support sleeve (10) radially extending spacing groove (21), a plurality of spacing groove (21) are followed support sleeve (10) axially spaced apart distributes, spacing groove (21) are suitable for holding the turn-ups of refill, spacing groove (21) with the turn-ups cooperation of refill is in support sleeve (10) axially limiting the position of refill.

2. The cartridge holder for an injection pen according to claim 1, wherein the stopper (20) is formed in a tubular structure, the stopper (20) comprising:

the first end of the first arc-shaped limiting plate (22) is detachably connected with the bracket sleeve (10);

the first end of the second arc-shaped limiting plate (23) is detachably connected with the support sleeve (10), and the first arc-shaped limiting plate (22) and/or the second arc-shaped limiting plate (23) are/is provided with the limiting groove (21);

the first and second arcuate limit plates (22, 23) define a second receiving channel extending in the axial direction of the holder sleeve (10), the second receiving channel being adapted to receive the cartridge and define the position of the cartridge in the radial direction of the holder sleeve (10).

3. The pen refill holder for an injection pen according to claim 2, wherein a first end of the first arc-shaped limiting plate (22) is provided with a first insertion portion (221), a first end of the second arc-shaped limiting plate (23) is provided with a second insertion portion (231), and the first insertion portion (221) and the second insertion portion (231) are inserted into the first end of the first receiving channel respectively.

4. The pen refill holder for an injection pen according to claim 2, wherein the inner sides of the first arc-shaped limiting plate (22) and the second arc-shaped limiting plate (23) are respectively provided with the limiting grooves (21), and the limiting grooves (21) located in the first arc-shaped limiting plate (22) and the limiting grooves (21) located in the second arc-shaped limiting plate (23) are spaced apart in the axial direction of the holder sleeve (10).

5. Refill holder for injection pens according to claim 2, characterized in that the first end of the holder sleeve (10) is provided with at least one connecting arm (11) extending in its axial direction, the outer side of the first arc-shaped limiting plate (22) and/or the outer side of the second arc-shaped limiting plate (23) is provided with a connecting groove (24), the connecting arm (11) cooperates with the connecting groove (24) to limit the rotation of the first arc-shaped limiting plate (22) and the second arc-shaped limiting plate (23).

6. The cartridge holder for an injection pen according to claim 5, wherein the limit groove (21) communicates with the connection groove (24), and an inner side of the connection arm (11) cooperates with a flange of the cartridge to limit the cartridge from rotating.

7. The cartridge holder for an injection pen according to claim 5, wherein a portion of the connection groove (24) is located at the first arc-shaped limiting plate (22), and another portion of the connection groove (24) is located at the second arc-shaped limiting plate (23).

8. Refill holder for an injection pen according to claim 5, characterized in that the outside of the connecting arm (11) is provided with a snap-in portion (111), which snap-in portion (111) is formed as a projection extending obliquely towards the holder sleeve (10), for cooperation with the housing (210) of the injection pen to define the position of the holder sleeve (10).

9. An injection pen housing assembly comprising the cartridge holder for an injection pen of any one of claims 1 to 8.

10. An injection pen comprising the injection pen housing assembly of claim 9.