Needle advancing and retreating driving device and injection pen

Abstract

The utility model discloses a needle advancing and retreating driving device and an injection pen, and the needle advancing and retreating driving device comprises a fixing frame which is provided with a first mounting channel; the transmission sleeve is movably arranged in the first mounting channel in the first direction, the transmission sleeve is provided with a second mounting channel, a limiting groove extending in the circumferential direction of the second mounting channel is formed in the inner wall face of the second mounting channel, an avoiding notch is formed in the first end of the second mounting channel, and one end of the avoiding notch communicates with the limiting groove; the refill support is movably arranged in the second installation channel between a first position and a second position around the axis of the refill support, a protruding part is arranged on the side wall of the refill support, when the refill support is located at the first position, the protruding part is matched with the limiting groove to limit the position of the refill support in the first direction, and when the refill support is located at the second position, the protruding part is matched with the limiting groove to limit the position of the refill support in the second direction. The protruding part corresponds to the avoiding notch in position, and the protruding part can penetrate through the avoiding notch. And the driving assembly is arranged on the fixing frame, and the driving assembly is connected with the transmission sleeve.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a needle driving device and an injection pen. BACKGROUND

[0002] The existing injection pen integrates needle driving and liquid driving, and the cartridge support and the needle driving device are connected together. After injection, in order to maintain the efficacy of the remaining liquid, the user usually needs to put the entire injection pen into a refrigerated environment. However, the water vapor generated in the refrigerated environment may penetrate into the interior of the injection pen, causing corrosion to the electronic components therein, thereby shortening the service life of the injection pen. SUMMARY

[0003] The first object of the present application is to provide a needle driving device, which can at least solve the technical problem of low service life of the existing injection pen.

[0004] The second object of the present application is to provide a new technical solution of an injection pen.

[0005] According to the first aspect of the present application, a needle driving device is provided, comprising: a fixed frame, the fixed frame being provided with a first mounting channel extending in a first direction; a transmission sleeve, the transmission sleeve being movably arranged in the first mounting channel in the first direction, the transmission sleeve being provided with a second mounting channel penetrating in the first direction, an inner wall surface of the second mounting channel being provided with a limiting groove extending in a circumferential direction thereof, a first end of the second mounting channel being provided with an avoiding notch, one end of the avoiding notch being in communication with the limiting groove; a cartridge support, the cartridge support being movably arranged in the second mounting channel about an axis thereof between a first position and a second position, a side wall of the cartridge support being provided with a protruding portion, at least part of the protruding portion being misaligned with the avoiding notch when the cartridge support is located at the first position, the protruding portion cooperating with the limiting groove to limit the position of the cartridge support in the first direction, the protruding portion corresponding to the position of the avoiding notch when the cartridge support is located at the second position, the protruding portion being capable of passing through the avoiding notch; and a driving assembly, the driving assembly being arranged in the fixed frame, the driving assembly being connected with the transmission sleeve to drive the transmission sleeve to move.

[0006] Optionally, in the circumferential direction of the second mounting channel, the limiting groove comprises a first functional segment and a second functional segment, wherein the first functional segment is in communication with the avoiding notch, the second functional segment is misaligned with the avoiding notch, and the depth of the second functional segment is greater than the depth of the first functional segment, the protruding portion being clamped in the second functional segment when the cartridge support is located at the first position.

[0007] Optionally, the protruding part is provided with a clamping rib on one side in the first direction, and the wall surface of the second functional section is provided with a clamping groove, and the clamping rib is clamped in the clamping groove when the refill holder is in the first position.

[0008] Optionally, the second functional section penetrates the transmission sleeve.

[0009] Optionally, the protruding part is provided with a first arc-shaped guide surface at a first end and / or a second end in the circumferential direction of the refill holder.

[0010] Optionally, the clamping rib is provided with a second arc-shaped guide surface at a first end and / or a second end in the circumferential direction of the refill holder.

[0011] Optionally, the inner wall surface of the second mounting channel is provided with a plurality of limiting grooves, and the plurality of limiting grooves are distributed in the circumferential direction of the second mounting channel, and the number of the limiting grooves corresponds to the number of the protruding part and the avoiding gap.

[0012] Optionally, when the refill holder is in the first position, the protruding part abuts against the inner wall surface of the second functional section on both sides in the first direction.

[0013] Optionally, the driving assembly comprises a guide rod, an axis of the guide rod is the same as the first direction, the guide rod is arranged on the fixed frame; a lead screw, an axis of the lead screw is the same as the first direction, the lead screw is rotatably arranged on the fixed frame around its axis; a sliding block, the sliding block is sleeved on the guide rod and the lead screw, the sliding block is threadedly connected with the lead screw, and the sliding block is connected with the transmission sleeve; a motor, the motor is arranged on the fixed frame, an output end of the motor is in transmission connection with the lead screw to drive the sliding block to move in the first direction.

[0014] According to the second aspect of the present application, an injection pen is provided, comprising the advancing and retracting needle driving device.

[0015] According to the advancing and retracting needle driving device of the present application, by arranging the protruding part on the side wall of the refill holder and arranging the corresponding limiting grooves and avoiding gap on the first mounting channel of the transmission sleeve, the refill holder can be installed by the insertion and rotation, and the refill holder can be disassembled by the rotation and pulling out, so that the refill holder can be quickly disassembled, the user can quickly separate the refill from the injection pen body, and then the refill holder with the refill can be independently stored in the refrigerator, without refrigerating the entire injection pen, thereby effectively avoiding the corrosion of water vapor on the electronic components in the injection pen, and improving the service life of the injection pen.

[0016] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings and claims.

[0018] Figure 1 is a schematic diagram of the overall structure of a needle advancing and retracting drive device according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of the structure of a transmission sleeve of a needle advancing and retracting drive device according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of the structure of a cartridge holder of a needle advancing and retracting drive device according to an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of the partial structure of a transmission sleeve and a cartridge holder of a needle advancing and retracting drive device according to an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of the structure of an injection pen according to an embodiment of the present application;

[0023] Figure 6 is a schematic diagram of the structure of a liquid injection drive device of an injection pen according to an embodiment of the present application.

[0024] REFERENCE NUMERALS:

[0025] 100, needle advancing and retracting drive device;

[0026] 10, fixed frame;

[0027] 20, transmission sleeve; 21, limiting groove; 21a, first functional section; 21b, second functional section; 21c, clamping groove; 22, avoiding notch;

[0028] 30, cartridge holder; 31, protruding part; 31a, clamping rib;

[0029] 40, drive assembly; 41, guide rod; 42, screw rod; 43, sliding block; 44, motor; 45, gear set; 46, first connecting holder; 47, second connecting holder;

[0030] 200, injection pen; 210, pen shell; 220, pen cap; 230, liquid injection drive device. DETAILED DESCRIPTION

[0031] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0032] In the description of this application, 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," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] The advance / retract needle drive device 100 according to an embodiment of this application is described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 4 As shown, the needle advance / retract drive device 100 according to an embodiment of this application includes: a fixed frame 10, a transmission sleeve 20, a pen refill bracket 30, and a drive assembly 40.

[0036] Specifically, the fixing bracket 10 has a first mounting channel extending along a first direction, the transmission sleeve 20 is movably disposed in the first mounting channel along the first direction, the transmission sleeve 20 has a second mounting channel penetrating along the first direction, the inner wall of the second mounting channel has a limiting groove 21 extending circumferentially thereon, the first end of the second mounting channel has a clearance notch 22, one end of the clearance notch 22 communicates with the limiting groove 21, and the pen refill holder 30 is movably disposed in the second mounting channel between a first position and a second position around its axis. The pen refill holder 30 has a protrusion 31 on its side wall. When the pen refill holder 30 is in the first position, at least a portion of the protrusion 31 is offset from the clearance notch 22. The protrusion 31 cooperates with the limiting groove 21 to limit the position of the pen refill holder 30 in the first direction. When the pen refill holder 30 is in the second position, the position of the protrusion 31 corresponds to the clearance notch 22. The protrusion 31 can pass through the clearance notch 22. The drive assembly 40 is provided on the fixed frame 10. The drive assembly 40 is connected to the transmission sleeve 20 to drive the transmission sleeve 20 to move.

[0037] In other words, such as Figures 1 to 4 As shown, the needle advance / retraction drive device 100 according to an embodiment of this application is applied to an injection pen 200. The needle advance / retraction drive device 100 mainly includes a fixing frame 10, a transmission sleeve 20, a pen refill holder 30, and a drive assembly 40. The fixing frame 10 is provided with a first mounting channel extending along a first direction. The transmission sleeve 20 can be movably mounted in the first mounting channel between the needle advance position and the needle retraction position along the first direction. The axial direction of the transmission sleeve 20 is the same as that of the first direction. The transmission sleeve 20 is constructed as a tubular structure. The inner space of the transmission sleeve 20 can serve as a second mounting channel suitable for mounting the pen refill holder 30.

[0038] like Figures 1 to 4 As shown, the pen refill holder 30 mainly includes a receiving sleeve and a locking sleeve. The receiving sleeve includes an upper tube section and a lower tube section. The radial dimension of the lower tube section is smaller than that of the upper tube section. The inner sides of the upper and lower tube sections form a receiving channel for installing a pen refill (e.g., a cartridge containing medicine). The upper end of the upper tube section is adapted to be threadedly connected to the locking sleeve to fix the pen refill in the receiving channel. The lower end sidewall of the lower tube section has external threads to connect an injection needle. The pen refill holder 30 is detachably installed at the first end of the second mounting channel.

[0039] Specifically, the inner wall of the second installation channel is provided with a limiting groove 21, which extends circumferentially along the second installation channel. The first end of the second installation channel is provided with a clearance notch 22, which extends along the first direction, so that one end of the clearance notch 22 communicates with the limiting groove 21. The outer side of the pen refill holder 30 is provided with a protrusion 31, the size of which is adapted to the size of the clearance notch 22, so that the protrusion 31 can pass through the clearance notch 22.

[0040] likeFigures 1 to 4 As shown, when installing the refill holder 30, the position of the protruding portion 31 corresponds to the position of the avoiding gap 22, the upper end of the refill holder 30 can be inserted into the second installation channel from the first end of the second installation channel until the upper surface of the protruding portion 31 abuts against the wall surface of the limiting groove 21, at this time, the refill holder 30 is located at the second position, and then the refill holder 30 is rotated so that the protruding portion 31 is staggered with at least part of the avoiding gap 22, at this time, the refill holder 30 is located at the first position, and the wall surface of the limiting groove 21 relatively arranged in the first direction cooperates with the protruding portion 31, so that the position of the refill holder 30 in the first direction can be limited.

[0041] When disassembling the refill holder 30, the refill holder 30 is moved from the first position to the second position by rotating the refill holder 30, so that the position of the protruding portion 31 corresponds to the position of the avoiding gap 22, at this time, the refill holder 30 can be pulled out along the axial direction (i.e., the first direction) of the refill holder 30 towards the outside of the pen barrel 210.

[0042] Therefore, according to the advancing and retracting needle driving device 100 of the embodiments of the present application, by arranging the protruding portion 31 on the side wall of the refill holder 30 and arranging the corresponding limiting groove 21 and avoiding gap 22 on the first installation channel of the transmission sleeve 20, the refill holder 30 can be installed by insertion and rotation, and the refill holder 30 can be disassembled by rotation and pulling out, so that the refill holder 30 can be quickly disassembled, the user can quickly separate the refill from the main body of the injection pen 200, and then the refill holder 30 loaded with the refill can be independently stored in a cold storage, without the need to store the entire injection pen 200 in the cold storage, thereby effectively avoiding the corrosion of the electronic components inside the injection pen 200 by water vapor, and improving the service life of the injection pen 200.

[0043] In some embodiments of the present application, in the circumferential direction of the second installation channel, the limiting groove 21 includes a first functional section 21a and a second functional section 21b, wherein the first functional section 21a communicates with the avoiding gap 22, the second functional section 21b is staggered with the avoiding gap 22, and the depth of the second functional section 21b is greater than the depth of the first functional section 21a, when the refill holder 30 is located at the first position, the protruding portion 31 is clamped in the second functional section 21b.

[0044] Specifically, as shown in Figure 2 and Figure 4 In the circumferential direction of the second installation channel, the limiting groove 21 can be divided into a first functional section 21a and a second functional section 21b, wherein the first functional section 21a corresponds to and communicates with the position of the avoiding gap 22, and the second functional section 21b is staggered with the position of the avoiding gap 22. When the refill holder 30 is located at the third position, the protruding portion 31 is located in the second functional section 21b, and when the refill holder 30 is located at the fourth position, the protruding portion 31 is located in the first functional section 21a.

[0045] In this embodiment, the depth of the second functional segment 21b is greater than the depth of the first functional segment 21a. This ensures that when the pen refill holder 30 moves to the third position, the protrusion 31 on the pen refill holder 30 can be engaged in the second functional segment 21b. This limits the position of the pen refill holder 30 in the circumferential direction of the second mounting channel and prevents the protrusion 31 from detaching from the second functional segment 21b. This enhances the stability and reliability of the connection between the pen refill holder 30 and the transmission sleeve 20.

[0046] According to one embodiment of this application, the protrusion 31 is provided with a snap-fit ​​rib 31a on one side in the first direction, and the wall surface of the second functional section 21b is provided with a snap-fit ​​groove 21c. When the pen refill bracket 30 is in the first position, the snap-fit ​​rib 31a snaps into the snap-fit ​​groove 21c.

[0047] In other words, such as Figures 2 to 4 As shown, the protrusion 31 has one or more snap-fit ​​ribs 31a on one side of the first direction (e.g., the lower side of the protrusion 31), and the wall surface of the second functional section 21b has snap-fit ​​grooves 21c that are adapted to the snap-fit ​​ribs 31a. When the pen refill holder 30 moves to the third position, the snap-fit ​​ribs 31a can be snapped into the snap-fit ​​grooves 21c, which can further limit the pen refill holder 30 in the circumferential direction of the second mounting channel to prevent unnecessary displacement. Moreover, it provides the user with intuitive feedback. That is, when the user feels a slight resistance or a "click" sound when the snap-fit ​​ribs 31a are successfully snapped into the snap-fit ​​grooves 21c, the user can confirm that the pen refill holder 30 has been accurately installed in place.

[0048] In some embodiments of this application, the second functional segment 21b extends through the transmission sleeve 20, thereby enabling the position of the protrusion 31 to be observed from the outside of the transmission sleeve 20, which is beneficial for installing the pen refill holder 30 into a suitable position, and can provide sufficient depth for the second functional segment 21b and the snap-fit ​​groove 21c, which can ensure the reliability of the connection of the pen refill holder 30.

[0049] According to one embodiment of this application, the protrusion 31 is provided with a first arcuate guide surface at the first end and / or the second end of the circumferential direction of the pen refill holder 30.

[0050] Specifically, the thickness of the protrusion 31 at the first and second ends of the pen refill holder 30 in the circumferential direction gradually decreases in the direction away from each other, so that the first and second ends of the protrusion 31 form a first arc-shaped guide surface.

[0051] In the embodiment, the first arc-shaped guide surface facilitates the protruding portion 31 to be separated from the second functional section 21b of the limiting groove 21, and when the cartridge holder 30 is disassembled, the user only needs to exert a moderate force to smoothly separate the protruding portion 31 from the second functional section 21b, without worrying about damaging the injection pen 200 due to improper disassembly.

[0052] In some optional examples of the present application, the clamping rib 31a is provided with a second arc-shaped guide surface at the first end and / or the second end in the circumferential direction of the cartridge holder 30.

[0053] In detail, the thickness of the clamping rib 31a at the first end and the second end in the circumferential direction of the cartridge holder 30 gradually thins away from each other, so that the first end and the second end of the clamping rib 31a form a second arc-shaped guide surface.

[0054] In the example, the provision of the arc-shaped guide surface enables the clamping rib 31a to smoothly cut into the second functional section 21b when the cartridge holder 30 switches positions, improving the smoothness when the cartridge holder 30 switches positions, and the clamping rib 31a with the arc-shaped guide surface is also easier to separate from the clamping groove 21c. When the cartridge holder 30 is disassembled, the user only needs to exert a moderate force to smoothly separate the clamping rib 31a from the clamping groove 21c, without worrying about damaging the injection pen 200 due to improper disassembly.

[0055] According to an embodiment of the present application, the inner wall surface of the second mounting channel is provided with a plurality of limiting grooves 21, and the plurality of limiting grooves 21 are distributed in the circumferential direction of the second mounting channel, and the avoiding gap 22 and the protruding portion 31 correspond to the number of limiting grooves 21.

[0056] Thus, the cartridge holder 30 is connected to the transmission sleeve 20 in multiple directions, which can avoid the cartridge holder 30 from shifting during use, effectively ensuring the use effect of the injection pen 200 and the user experience.

[0057] In some embodiments of the present application, when the cartridge holder 30 is in the first position, the protruding portion 31 abuts against the inner wall surface of the second functional section 21b on both sides in the first direction.

[0058] That is, the size of the protruding portion 31 in the first direction can be slightly larger than the size of the second functional section 21b in the first direction, so that when the cartridge holder 30 is in the first position, the protruding portion 31 abuts against the inner wall surface of the second functional section 21b on both sides in the first direction, which can enhance the connection strength between the cartridge holder 30 and the transmission sleeve 20, and effectively prevent the cartridge holder 30 from shaking or shifting in the first direction, effectively ensuring the use effect of the injection pen 200 and the user experience.

[0059] According to one embodiment of the present application, the driving assembly 40 comprises a guide rod 41, the axial direction of the guide rod 41 is the same as the first direction, the guide rod 41 is arranged on the fixed frame 10; a screw rod 42, the axial direction of the screw rod 42 is the same as the first direction, the screw rod 42 is rotatably arranged on the fixed frame 10 around its own axis; a sliding block 43, the sliding block 43 is sleeved on the guide rod 41 and the screw rod 42, the sliding block 43 is threadedly connected with the screw rod 42, and the sliding block 43 is connected with the transmission sleeve 20; a motor 44, the motor 44 is arranged on the fixed frame 10, the output end of the motor 44 is in transmission connection with the screw rod 42, so as to drive the sliding block 43 to move along the first direction.

[0060] Specifically, as shown in the figure, Figure 1 the driving assembly 40 mainly comprises the guide rod 41, the screw rod 42, the sliding block 43 and the motor 44, wherein the axial direction of the guide rod 41, the axial direction of the screw rod 42 and the axial direction of the motor 44 are the same as the direction, the first end of the motor 44 is non-rotatably connected with a first connecting bracket 46, the second end of the motor 44 is non-rotatably connected with a second connecting bracket 47, the guide rod 41 and the screw rod 42 are both mounted on the first connecting bracket 46 and the second connecting bracket 47, and the screw rod 42 is rotatable relative to the first connecting bracket 46 and the second connecting bracket 47, one end of the screw rod 42 is in transmission connection with the output end of the motor 44 through a gear set 45, so that the motor 44 can drive the screw rod 42 to rotate.

[0061] As shown in the figure, Figure 1 the sliding block 43 is sleeved on the guide rod 41 and the screw rod 42, and the sliding block 43 is threadedly connected with the screw rod 42, so that when the screw rod 42 rotates, the sliding block 43 can be driven to move along the first direction on the guide rod 41 and the screw rod 42. The first connecting bracket 46 and the second connecting bracket 47 are fixed on one side of the fixed frame 10 through screws, one side of the transmission sleeve 20 is provided with a connecting groove, and the sliding block 43 is inserted into the connecting groove, so that the transmission sleeve can be driven to move between the needle insertion position and the needle withdrawal position through the sliding block 43.

[0062] In the present example, the driving assembly 40 based on the transmission mode of threaded connection can ensure the stability and accuracy of the movement of the transmission sleeve 20, so that the injection pen 200 can exhibit stable and reliable performance when performing needle insertion and needle withdrawal.

[0063] In summary, according to the advancing and retracting needle driving device 100 of the embodiments of the present application, the protruding part 31 is arranged on the side wall of the needle holder 30, and the limiting groove 21 and the avoiding gap 22 are arranged on the first mounting channel of the transmission sleeve 20, so that the needle holder 30 can be installed by the insertion and rotation mode, and the needle holder 30 can be disassembled by the rotation and pulling mode, the needle holder 30 can be quickly disassembled, the user can quickly separate the needle from the main body of the injection pen 200, and then the needle holder 30 containing the needle can be independently stored in the refrigerator, and the whole injection pen 200 does not need to be stored in the refrigerator, so that the erosion of the electronic components in the injection pen 200 by the water vapor can be effectively avoided, and the service life of the injection pen 200 can be improved.

[0064] As shown in Figure 5 and Figure 6 The embodiments of the present application also provide an injection pen 200, which comprises the advancing and retracting needle driving device 100, the pen shell 210, the pen cap 220 and the liquid injection driving device 230 described in any of the above embodiments, wherein the inner wall surface of the pen shell 210 defines a mounting cavity, the mounting cavity is provided with an opening at one end in a first direction (for example, a vertical direction), the pen cap 220 is detachably sleeved on one end of the pen shell 210 close to the opening, one end of the pen cap 220 away from the pen shell 210 is provided with a needle hole penetrating in the first direction, the advancing and retracting needle driving device 100 is mounted in the mounting cavity, and the position of the transmission sleeve 20 corresponds to the position of the opening, and the liquid injection driving device 230 is arranged on the transmission sleeve 20.

[0065] In the embodiment, the transmission sleeve 20 can be driven by the driving assembly 40 to be movable along the first direction between the needle advancing position and the needle retracting position, and the piston of the needle can be driven by the liquid injection driving device 230 to be movable.

[0066] According to the injection pen 200 of the embodiment of the present application, before injection, the drive sleeve 20 is located at the needle retraction position, at this time, the injection needle is wholly located in the cap 220, and a part of the cartridge holder 30 is located in the cap 220; when injection is needed, the end of the cap 220 can be attached to the skin at the position to be injected, and then the drive assembly 40 is used to drive the drive sleeve 20 to move from the needle retraction position to the needle insertion position, during the movement of the drive sleeve 20, the drive sleeve 20 can drive the cartridge holder 30 to move, so that the needle body of the injection needle extends from the needle insertion hole and penetrates into the skin, thereby realizing the automatic needle insertion process, and then the injection can be completed by driving the piston of the cartridge to move through the liquid injection driving device 230; after the injection is completed, the drive assembly 40 can be used to drive the drive sleeve 20 to move from the needle insertion position to the needle retraction position, during the movement, the drive sleeve 20 drives the cartridge holder 30 to move synchronously, so that the needle body of the injection needle is retracted into the cap 220 from the needle insertion hole; when the cartridge needs to be refrigerated, the cap 220 is removed, and then the cartridge holder 30 can be removed by rotating and pulling out, and finally the cartridge holder 30 can be placed in the refrigeration environment together with the cartridge for storage.

[0067] Since the needle insertion and retraction driving device 100 according to the embodiment of the present application has the above technical effects, the injection pen 200 according to the embodiment of the present application also has corresponding technical effects, and the embodiment will not be described again.

[0068] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A knitting machine drive device for advancing and retracting a needle, characterized by comprising: The utility model relates to a pen refill fixing device, comprising: a fixing frame (10) provided with a first mounting channel extending along a first direction; a transmission sleeve (20) movably arranged in the first mounting channel along the first direction, the transmission sleeve (20) being provided with a second mounting channel penetrating along the first direction, an inner wall surface of the second mounting channel being provided with a limiting groove (21) extending along the circumferential direction thereof, a first end of the second mounting channel being provided with an avoiding notch (22), one end of the avoiding notch (22) being in communication with the limiting groove (21); a pen refill support (30) movably arranged in the second mounting channel around an axis thereof between a first position and a second position, a side wall of the pen refill support (30) being provided with a protruding part (31), when the pen refill support (30) is located at the first position, at least part of the protruding part (31) is staggered with the avoiding notch (22), the protruding part (31) is matched with the limiting groove (21) to limit the position of the pen refill support (30) in the first direction, when the pen refill support (30) is located at the second position, the protruding part (31) corresponds to the position of the avoiding notch (22), and the protruding part (31) can pass through the avoiding notch (22); a driving assembly (40) arranged in the fixing frame (10), the driving assembly (40) being connected with the transmission sleeve (20) to drive the transmission sleeve (20) to move.

2. The advancing and retracting needle drive device according to claim 1, characterized in that In the circumferential direction of the second mounting channel, the limiting groove (21) comprises a first functional section (21a) and a second functional section (21b), wherein the first functional section (21a) is in communication with the avoiding notch (22), the second functional section (21b) is staggered with the avoiding notch (22), and the depth of the second functional section (21b) is greater than that of the first functional section (21a), and when the pen refill support (30) is located at the first position, the protruding part (31) is clamped in the second functional section (21b).

3. The advancing and retracting needle drive device of claim 2, wherein, The protruding part (31) is provided with a clamping rib (31a) on one side in the first direction, a wall surface of the second functional section (21b) is provided with a clamping groove (21c), and when the pen refill support (30) is located at the first position, the clamping rib (31a) is clamped in the clamping groove (21c).

4. The advancing and retracting needle drive device of claim 2, wherein, The second functional section (21b) penetrates the transmission sleeve (20).

5. The advancing and retracting needle drive device of claim 2, wherein, The protruding part (31) is provided with a first arc-shaped guide surface at a first end and / or a second end in the circumferential direction of the pen refill support (30).

6. The advancing and retracting needle drive device of claim 3, wherein, The clamping rib (31a) is provided with a second arc-shaped guide surface at a first end and / or a second end in the circumferential direction of the pen refill support (30).

7. The advancing and retracting needle drive of claim 1, wherein, The inner wall surface of the second mounting channel is provided with a plurality of limiting grooves (21), and the plurality of limiting grooves (21) are distributed along the circumferential direction of the second mounting channel, the avoiding notch (22) and the protruding part (31) corresponding to the number of the limiting grooves (21).

8. The advancing and retracting needle drive of claim 2, wherein, When the refill holder (30) is in the first position, the protruding portion (31) abuts against the inner wall surface of the second functional section (21b) on both sides of the first direction.

9. The advancing and retracting needle drive device according to any one of claims 1 to 7, characterized in that The driving assembly (40) comprises: a guide rod (41) which is arranged on the fixed frame (10) and has the same axial direction as the first direction; a screw rod (42) which is rotatably arranged on the fixed frame (10) and has the same axial direction as the first direction; a sliding block (43) which is sleeved on the guide rod (41) and the screw rod (42), is threadedly connected with the screw rod (42), and is connected with the transmission sleeve (20); a motor (44) which is arranged on the fixed frame (10) and has an output end which is drivingly connected with the screw rod (42) to drive the sliding block (43) to move along the first direction.

10. An injection pen characterized in that The application further provides a needle advancing and retreating driving device comprising any one of the above-mentioned devices.

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