CN219148821U

CN219148821U - Pen cap assembly for injection pen and injection pen with same

Info

Publication number: CN219148821U
Application number: CN202223409056.1U
Authority: CN
Inventors: 许云初; 吴军美; 何艳; 王少锋; 费正兴; 李汉忠
Original assignee: Jiangsu Delfu Medical Devices Co ltd
Current assignee: Jiangsu Delfu Medical Devices Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-06-09
Anticipated expiration: 2032-12-19

Abstract

The application discloses injection pen is with pen cap subassembly and have its injection pen, injection pen is with pen cap subassembly includes: the injection pen comprises a shell and a movable piece, wherein one end of the shell is provided with an opening suitable for connecting an injection pen, a plurality of clamping jaws are arranged in the shell at intervals along the circumferential direction of the shell, a first end of each clamping jaw is connected with the shell, a second end of each clamping jaw is movable in a first state and a second state, the clamping jaw is suitable for clamping the injection needle under the condition that the clamping jaw is in the first state, and the clamping jaw is separated from the injection needle under the condition that the clamping jaw is in the second state; the movable piece is movably arranged on the shell and matched with the clamping jaw to drive the clamping jaw to switch between the first state and the second state. The pen cap component for the injection pen effectively avoids accidental injury of a user by the injection needle, and improves safety of the injection pen when the injection needle is detached.

Description

Pen cap assembly for injection pen and injection pen with same

Technical Field

The application belongs to the technical field of medical equipment, and particularly relates to a pen cap assembly for an injection pen and the injection pen with the pen cap assembly.

Background

The automatic injection pen, which is a common medical instrument, can replace manual needle insertion, injection and the like to accurately extrude the required dosage. In the existing automatic injection pen, the injection needle is in threaded connection with the injection pen, the injection needle needs to be disassembled after a user finishes injection for a patient, the injection needle belongs to a sharp device, in the daily process, the user can have potential safety hazards of accidental injury by the needle, and in the operation process, the hand of the user is also easy to contact with residual waste liquid on the needle.

Disclosure of Invention

An object of the present application is to provide a new technical scheme of pen cap assembly for injection pen, can solve the technical problem that the injection pen security is poor when dismantling the syringe needle among the prior art at least.

It is another object of the present application to provide an injection pen comprising a cap assembly as described above for an injection pen.

The cap assembly for an injection pen according to the first aspect of the present application comprises: the injection pen comprises a shell, wherein one end of the shell is provided with an opening suitable for connecting an injection pen, a plurality of clamping jaws which are arranged at intervals along the circumferential direction of the shell are arranged in the shell, a first end of each clamping jaw is connected with the shell, a second end of each clamping jaw is movable in a first state and a second state, the clamping jaw is suitable for clamping the injection needle when being in the first state, and the clamping jaw is separated from the injection needle when being in the second state; the movable piece is movably arranged on the shell and matched with the clamping jaw to drive the clamping jaw to switch between the first state and the second state.

According to the pen cap assembly for the injection pen, the clamping jaw can be driven to switch between the first state and the second state through the movable piece, the clamping jaw can clamp the injection needle in the first state, when the injection needle is dismounted, the human body can be prevented from being directly contacted with the injection needle, accidental injury of a user by the injection needle is effectively avoided, the injection needle can be moved to a corresponding collecting area after being dismounted, the injection needle can be put in the collecting area through switching the clamping jaw to the second state, no contact is generated between the clamping jaw and the injection needle in the whole process, and the safety of the injection pen when the injection needle is dismounted is effectively improved.

According to one embodiment of the application, the bottom of the inner side of the shell is provided with a connecting column, a first end of the connecting column is connected with the shell, a second end of the connecting column is provided with the clamping jaw, and a first end of the clamping jaw is connected with a second end of the connecting column.

According to one embodiment of the application, the bottom of the shell is provided with a mounting hole, the connecting column penetrates through the mounting hole, and the connecting column can move along the axial direction of the mounting hole.

According to one embodiment of the present application, the connecting post is screwed with the mounting hole.

According to one embodiment of the present application, the clamping jaw comprises an elastic arm and a clamping portion, one end of the elastic arm is connected with the connecting column, the other end of the elastic arm is movable, and the clamping portion is arranged on the inner side of the other end of the elastic arm.

According to one embodiment of the application, the clamping jaw is in an open state when the clamping jaw is not under force; the movable piece is formed into an annular structure, the movable piece is sleeved on the outer side of the connecting column and is in threaded connection with the connecting column, the movable piece can move to the periphery of the clamping jaw, a notch is formed in the side wall of the shell, and part of the movable piece extends out of the notch.

According to one embodiment of the application, the bottom of the shell is provided with a driving chamber, a motor is movably arranged in the driving chamber along the axial direction of the shell, and the output end of the motor is connected with the first end of the connecting column to drive the connecting column to rotate.

According to one embodiment of the application, the clamping jaw is in a closed state when not under force; the connecting column is close to one end of clamping jaw is equipped with along its axial extension's installation passageway, the moving part forms into piston portion, piston portion is followed installation passageway's axial movably locates in the connecting column, piston portion keeps away from one end of clamping jaw is equipped with the control rod, one end of control rod with piston portion connects, the other end of control rod movably runs through the connecting column.

According to one embodiment of the application, the control rod is formed as a screw rod, which is screwed with the connecting post.

An injection pen according to the second aspect of the present application comprises a cap assembly for an injection pen according to any of the embodiments described above.

Additional aspects and advantages of the application 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 application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a perspective view of a cap assembly for an injection pen according to one embodiment of the present application;

FIG. 2 is a state diagram of a cap assembly for an injection pen mated with an injection needle according to one embodiment of the present application;

FIG. 3 is a state diagram of the spring arm of the cap assembly for an injection pen in a normal state according to one embodiment of the present application;

FIG. 4 is a schematic view showing the internal structure of a cap assembly for an injection pen according to embodiment 1 of the present application;

FIG. 5 is a schematic view showing the internal structure of a driving chamber of a cap assembly for an injection pen according to embodiment 1 of the present application;

FIG. 6 is a schematic view showing the internal structure of a cap assembly for an injection pen according to embodiment 2 of the present application;

FIG. 7 is a state diagram of the elastic arm of the cap assembly for the injection pen according to embodiment 2 of the present application in a normal state;

fig. 8 is a perspective view of an injection pen according to an embodiment of the present application.

Reference numerals:

a cap assembly 1000 for an injection pen;

a housing 100;

a clamping jaw 200; a resilient arm 210; a clamping portion 220; a support 221;

a movable member 300; a piston portion 310; a control lever 320;

a connection post 400;

a driving chamber 500; a guide rail 510;

a motor 600; a connecting sleeve 610; a guide post 611;

a battery 700;

a controller 800; a control button 810;

injection pen 2000.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "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 illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, 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 terms in this application will be understood by those of ordinary skill in the art in a specific context.

The pen cap assembly 1000 for an injection pen according to an embodiment of the present application is specifically described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, a cap assembly 1000 for an injection pen according to an embodiment of the present application includes a housing 100 and a movable member 300.

Specifically, one end of the housing 100 is provided with an opening suitable for connecting an injection pen, a plurality of clamping jaws 200 are arranged in the housing 100 at intervals along the circumferential direction of the housing, a first end of the clamping jaws 200 is connected with the housing 100, a second end of the clamping jaws 200 is movable between a first state and a second state, the clamping jaws 200 are suitable for clamping an injection needle when the clamping jaws 200 are in the first state, and the clamping jaws 200 are separated from the injection needle when the clamping jaws 200 are in the second state; the movable member 300 is movably disposed on the housing 100, and the movable member 300 cooperates with the clamping jaw 200 to drive the clamping jaw 200 to switch between the first state and the second state.

In other words, the cap assembly 1000 for an injection pen according to the embodiment of the present application is mainly composed of a housing 100 and a movable member 300, wherein one end of the housing 100 is provided with an opening adapted to accommodate an injection needle of an injection pen, a plurality of jaws 200 for clamping the injection needle are provided in the housing 100, the plurality of jaws 200 may be uniformly distributed at intervals around a circumference of the injection needle, one end of the jaws 200 is connected with the housing 100, the other end of the jaws 200 may be movable in a first state and a second state, the movable member 300 may be movably provided to the housing 100, the movable member 300 may cooperate with the jaws 200 to drive the jaws 200 to switch between the first state and the second state, the jaws 200 clamp and fix the injection needle at a circumferential side of the injection needle when the jaws 200 are in the first state, and the jaws 200 may be separated from the injection needle when the jaws 200 are switched to the second state.

The shape of the open end of the housing 100 may be determined according to the shape of the injection pen, when the shape of the open end of the housing 100 is circular, the clamping jaw 200 may not rotate relative to the housing 100, and the injection needle may be driven to rotate by rotating the housing 100 to detach the injection needle, in addition, the clamping jaw 200 may be connected to the housing 100 through other members, and the injection needle may be detached by driving the clamping jaw 200 to rotate through other members.

According to the pen cap assembly 1000 for the injection pen, the clamping jaw 200 can be driven to switch between the first state and the second state through the movable piece 300, the clamping jaw 200 can clamp the injection needle in the first state, when the injection needle is dismounted, the human body can be prevented from directly contacting the injection needle, accidental injuries of a user by the injection needle are effectively avoided, the injection needle can be moved to a corresponding collecting area after being dismounted, the injection needle can be thrown into the collecting area through switching the clamping jaw 200 to the second state, no contact is generated between the clamping jaw 200 and the injection needle in the whole process, and the safety of the injection pen when the injection needle is dismounted is effectively improved.

In addition, to the injection pen that can automatic needle feeding and injection, after the injection is accomplished and the needle is moved back, the syringe needle contracts in the injection pen, can directly dismantle the syringe needle through this application pen cap assembly 1000 for the injection pen, need not to drive the syringe needle again and stretches out from the injection pen, has reduced the use of the needle feeding drive of injection pen, can effectively improve the life of injection pen, can make to dismantle the injection pen more convenient. Meanwhile, the pen cap assembly 1000 for the injection pen can also be used for installing an injection needle.

According to one embodiment of the present application, a connecting column 400 is provided at the bottom of the inner side of the housing 100, a first end of the connecting column 400 is connected with the housing 100, a second end of the connecting column 400 is provided with a clamping jaw 200, and a first end of the clamping jaw 200 is connected with a second end of the connecting column 400.

As shown in fig. 2, a connecting column 400 with a tubular structure is arranged at the bottom of the inner side of the casing 100, a first end of the connecting column 400 is connected with the casing 100, the connection can be fixed connection or movable connection, the clamping jaw 200 can be formed into a strip structure, a lower end of the clamping jaw 200 is connected with a second end of the connecting column 400, and the connection mode of the connecting column 400 and the casing 100 can be adjusted adaptively according to the specific structure of the clamping jaw 200.

In some embodiments of the present application, the bottom of the housing 100 is provided with a mounting hole through which the connection post 400 passes, and the connection post 400 is movable along the axial direction of the mounting hole.

As shown in fig. 2, the bottom of the housing 100 is provided with a mounting hole through which the connection post 400 passes, the first end of the connection post 400 passes through the mounting hole, and the connection post 400 can move along the axial direction of the mounting hole, when the injection needle is detached, the connection post 400 can move downwards along with the injection needle as the injection needle moves downwards gradually, and when the injection pen is used, the housing 100 can not move downwards relative to the injection pen, so that the injection pen is convenient for a user to use.

According to one embodiment of the present application, the connection post 400 is threadedly coupled with the mounting hole.

As shown in fig. 2 and 4, the side wall of the first end of the connecting column 400 is provided with an external thread, an internal thread is arranged in the mounting hole, the connecting column 400 is connected with the mounting hole in a threaded connection manner, an axial supporting force can be provided for the connecting column 400, the external thread is identical to the thread pitch of the internal thread and the thread pitch on the injection needle, the connecting column 400 can synchronously move along with the injection needle by rotating the connecting column 400, and when the needle is detached, the first end of the connecting column 400 is rotated, so that the operation is convenient.

In some embodiments of the present application, the clamping jaw 200 includes a resilient arm 210 and a clamping portion 220, one end of the resilient arm 210 is connected to the connecting post 400, the other end of the resilient arm 210 is movable, and the clamping portion 220 is disposed inside the other end of the resilient arm 210.

As shown in fig. 3 and 4, the clamping jaw 200 is composed of an elastic arm 210 and a clamping part 220, wherein the lower end of the elastic arm 210 is connected with the upper end of the connecting column 400, preferably, the clamping jaw 200 and the connecting column 400 can be integrally formed, so as to facilitate production and manufacture, the upper end of the elastic arm 210 can move relative to the connection position of the elastic arm 210 and the connecting column 400, the clamping part 220 is arranged at the inner side of the upper end of the elastic arm 210, the surface of the clamping part 220 is also provided with anti-skid patterns, the friction force between the clamping part 220 and the injection needle can be increased through the anti-skid patterns, and the slipping between the clamping part 220 and the injection needle can be prevented.

According to an embodiment of the present application, as shown in fig. 3 and 4, the lower portion of the inner side of the grip part 220 is provided with a supporting part 221, and the lower side of the injection needle can be supported by the supporting part 221, thereby being more convenient in installing the injection needle.

In addition, the jaw 200 may have a structure similar to the three-jaw chuck except for the above structure, so long as the injection needle can be fixed, and the movable member 300 may be adaptively changed according to the structure of the jaw 200.

Example 1

According to one embodiment of the present application, when the jaw 200 is unstressed, the jaw 200 is in an open state; the movable member 300 is formed in a ring structure, the movable member 300 is sleeved outside the connecting column 400 and is in threaded connection with the connecting column, the movable member 300 can move to the periphery of the clamping jaw 200, a notch is formed in the side wall of the shell 100, and part of the movable member 300 extends out of the notch.

As shown in fig. 1 to 3, the clamping jaw 200 is in an open state in a normal state, the elastic arm 210 provides an elastic force for the clamping jaw 200 in a radial direction, the movable member 300 is formed into a ring structure, the movable member can move along the axial direction of the connecting column 400, in order to facilitate the adjustment of the position of the movable member 300, the side wall of the housing 100 is provided with a notch, a part of the movable member 300 extends out of the notch, the inner side of the movable member 300 is provided with an internal thread, the side wall of the upper end of the connecting column 400 and the side wall of the lower end of the elastic arm 210 are provided with external threads, the movable member 300 is movably added to the periphery of the lower end of the clamping jaw 200 in a threaded connection with the connecting column 400, and when the state of the clamping jaw 200 is switched, the movable member 300 can move to the periphery of the lower end of the clamping jaw 200 to provide a radial restraining force for the clamping jaw 200 to shrink inwards along the radial direction thereof, so that the clamping jaw 200 can clamp an injection needle.

In some embodiments of the present application, a driving chamber 500 is provided at the bottom of the housing 100, and a motor 600 is movably provided in the driving chamber 500 along the axial direction of the housing 100, and an output end of the motor 600 is connected with a first end of the connection post 400 to drive the connection post 400 to rotate.

As shown in fig. 4 and 5, a driving chamber 500 is disposed at the bottom of the housing 100, the lower end of the connection column 400 is located in the driving chamber 500, a motor 600 is further disposed in the driving chamber 500, the output end of the motor 600 is fixedly connected with the lower end of the connection column 400, a connection sleeve 610 is sleeved at the lower end of the motor 600, the connection sleeve 610 is fixedly connected with the motor 600, a plurality of guide columns 611 are disposed on the side wall of the connection sleeve 610, a guide rail 510 matched with the guide columns 611 is fixedly connected in the driving chamber 500, and the guide columns 611 can move in the guide rail 510 along the axial direction of the housing 100. When in use, the connecting column 400 can be driven to rotate by controlling the motor 600 to rotate, manual operation is not needed, and the working efficiency in the process of disassembling and installing the injection needle is effectively improved.

According to an embodiment of the application, a battery 700 and a controller 800 are arranged in the driving chamber 500, the battery 700 is electrically connected with the controller 800 and the motor 600 to provide power for the battery 700, the controller 800 is electrically connected with the motor 600, a control button 810 is arranged on the controller 800, the control button 810 is positioned outside the driving chamber 500, and the motor 600 can be driven to rotate by pressing the control button 810 when the driving chamber is used so as to rapidly detach and install the injection needle, and the driving chamber is high in accuracy and convenient for a user to use.

When the injection pen cap assembly 1000 of the present embodiment is used for disassembling an injection needle, the open end of the housing 100 is mounted at the lower end of the injection pen, then the movable member 300 is rotated, so that the movable member 300 moves upwards relative to the connecting column 400, the movable member 300 is moved to the circumferential side of the lower end of the clamping jaw 200, the clamping jaw 200 is provided with radial constraint force by the movable member 300, so that the clamping jaw 200 contracts inwards along the radial direction thereof, the injection needle is clamped, and finally the motor 600 is controlled to rotate clockwise by the control button 810, and the connecting column 400 is driven to rotate when the motor 600 rotates, thereby driving the injection needle to rotate, and the injection needle is disassembled; when the injection needle is mounted, the injection needle is first fixed between the clamping jaws 200, then the open end of the housing 100 is mounted at the lower end of the injection pen, and finally the motor 600 is controlled to rotate counterclockwise to mount the injection needle.

Example 2

In some embodiments of the present application, the jaws 200 are in a closed state when unstressed; the connecting column 400 is provided with a mounting channel extending along the axial direction thereof at one end close to the clamping jaw 200, the movable piece 300 is formed into a piston part 310, the piston part 310 is movably arranged in the connecting column 400 along the axial direction of the mounting channel, one end of the piston part 310 far away from the clamping jaw 200 is provided with a control rod 320, one end of the control rod 320 is connected with the piston part 310, and the other end of the control rod 320 movably penetrates through the connecting column 400.

As shown in fig. 6 and 7, the clamping jaw 200 is in a closed state in a normal state, the elastic arm 210 provides a radial elastic clamping force for the clamping jaw 200, the connecting column 400 is of a tubular structure, an installation channel is formed inside the connecting column, the movable piece 300 is formed into a piston part 310 of a columnar structure, the side wall of the piston part 310 is attached to the side wall of the installation channel, the lower end of the piston part 310 is connected with a control rod 320, the lower end of the control rod 320 passes through the connecting column 400 to be located at the outer side of the installation channel, the control rod 320 can move along the axial direction of the installation channel, the piston part 310 can be driven to move through the movable control rod 320, and when the piston part 310 moves to the inner side of the lower end of the clamping jaw 200, the side wall of the piston part 310 applies a thrust force to the inner side of the clamping jaw 200 along the radial direction towards the outer side of the piston part, so that the clamping jaw 200 can be in an open state.

According to an embodiment of the application, the control rod 320 is formed into a screw rod, the control rod 320 is in threaded connection with the connecting column 400, the position of the control rod 320 can be automatically positioned in a threaded connection mode, pushing force is not required to be provided for the control rod 320 manually, and the control rod is convenient for a user to use.

When the injection pen cap assembly 1000 of the embodiment is used for disassembling an injection needle, firstly, the screw rod is rotated forward, so that the screw rod moves upwards relative to the connecting column 400, the piston part 310 is driven to move when the connecting column 400 moves upwards, when the piston part 310 moves to the inner side of the lower end of the clamping jaw 200, the side wall of the piston part 310 applies a thrust force to the inner side of the clamping jaw 200 along the radial direction towards the outer side of the clamping jaw, so that the clamping jaw 200 is in an open state, then, the open end of the shell 100 is arranged at the lower end of the injection pen, secondly, the screw rod is rotated reversely, the piston part 310 is driven to move downwards, the clamping jaw 200 is closed to clamp and fix the injection needle, and finally, the injection needle can be disassembled by rotating the connecting column 400; when the injection needle is mounted, the injection needle is first fixed between the clamping jaws 200, then the open end of the housing 100 is mounted at the lower end of the injection pen, and finally the injection needle can be mounted by controlling the rotation of the connecting column 400.

In summary, according to the pen cap assembly 1000 for an injection pen of the embodiment of the application, the movable piece 300 can drive the clamping jaw 200 to switch between the first state and the second state, the clamping jaw 200 can clamp the injection needle in the first state, when the injection needle is disassembled, the human body can be prevented from directly contacting the injection needle, the accidental injury of a user by the injection needle is effectively avoided, the injection needle can be moved to a corresponding collecting area after the injection needle is disassembled, the injection needle can be thrown into the collecting area by switching the clamping jaw 200 to the second state, no contact is generated between the user and the injection needle in the whole process, the safety of the injection pen when the injection needle is disassembled is effectively improved, and particularly, the effect of the injection pen capable of automatically injecting and injecting is more obvious.

As shown in fig. 8, the present application further provides an injection pen 2000, including the cap assembly 1000 for injection pen according to any of the above embodiments, where the housing 100 is detachably mounted at the lower end of the injection pen 2000, and preferably, the housing 100 is connected to the injection pen 2000 by a clamping manner. Because the pen cap assembly 1000 for an injection pen according to the embodiment of the present application can improve the safety of the injection pen when the injection needle is detached, the injection pen 2000 of the embodiment of the present application also has the advantages described above, can improve the safety of the injection pen 2000 when the injection needle is detached, is convenient for a user to use, and is not described here again.

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 present application. 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 application 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 principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A cap assembly for an injection pen, comprising:

the injection pen comprises a shell (100), wherein one end of the shell (100) is provided with an opening suitable for connecting an injection pen, a plurality of clamping jaws (200) which are arranged at intervals along the circumferential direction of the shell are arranged in the shell (100), a first end of each clamping jaw (200) is connected with the shell (100), a second end of each clamping jaw (200) is movable in a first state and a second state, the clamping jaws (200) are suitable for clamping an injection needle when the clamping jaws (200) are in the first state, and the clamping jaws (200) are separated from the injection needle when the clamping jaws (200) are in the second state;

the movable piece (300) is movably arranged on the shell (100), and the movable piece (300) is matched with the clamping jaw (200) to drive the clamping jaw (200) to switch between the first state and the second state.

2. Pen cap assembly for injection pen according to claim 1, characterized in that the inside bottom of the housing (100) is provided with a connecting post (400), a first end of the connecting post (400) is connected with the housing (100), a second end of the connecting post (400) is provided with the clamping jaw (200), and a first end of the clamping jaw (200) is connected with a second end of the connecting post (400).

3. Pen cap assembly according to claim 2, characterized in that the bottom of the housing (100) is provided with a mounting hole through which the connection post (400) passes, and that the connection post (400) is movable in the axial direction of the mounting hole.

4. A pen cap assembly according to claim 3, wherein the connection post (400) is threadedly connected with the mounting hole.

5. Pen cap assembly according to claim 2, characterized in that the clamping jaw (200) comprises a resilient arm (210) and a clamping portion (220), one end of the resilient arm (210) is connected to the connecting post (400), the other end of the resilient arm (210) is movable, and the clamping portion (220) is arranged inside the other end of the resilient arm (210).

6. The injection pen cap assembly according to claim 5, wherein the clamping jaw (200) is in an open state when the clamping jaw (200) is not under force;

the movable piece (300) is formed into an annular structure, the movable piece (300) is sleeved on the outer side of the connecting column (400) and is in threaded connection with the connecting column, the movable piece (300) can move to the periphery of the clamping jaw (200), a notch is formed in the side wall of the shell (100), and the part of the movable piece (300) extends out of the notch.

7. The pen cap assembly according to claim 6, wherein a driving chamber (500) is provided at the bottom of the housing, a motor (600) is movably provided in the driving chamber (500) along the axial direction of the housing (100), and an output end of the motor (600) is connected with the first end of the connection post (400) to drive the connection post (400) to rotate.

8. The cap assembly for an injection pen according to claim 5, wherein the clamping jaw (200) is in a closed state when not under force;

the utility model discloses a clamping jaw, including spliced pole (400) and movable part (300), spliced pole (400) are close to one end of clamping jaw (200) is equipped with along its axially extending's installation passageway, movable part (300) are formed into piston portion (310), piston portion (310) are followed the axial of installation passageway is movably located in spliced pole (400), piston portion (310) are kept away from one end of clamping jaw (200) is equipped with control rod (320), one end of control rod (320) with piston portion (310) are connected, the other end of control rod (320) movably runs through spliced pole (400).

9. The cap assembly for an injection pen according to claim 8, wherein the control rod (320) is formed as a screw rod, and the control rod (320) is screw-coupled with the connection post (400).

10. An injection pen comprising a cap assembly for an injection pen as claimed in any one of claims 1 to 9.