Tubular injection device and driving mechanism

Abstract

The invention discloses a tubular injection device and a driving mechanism, the tubular injection device is provided with a near end and a far end, and the tubular injection device comprises a medicine storage part, an injection part, a moving part and the driving mechanism. The injection member is disposed at the proximal end and is in fluid communication with the drug storage member. The moving part is movably arranged in the medicine storage part. The driving mechanism comprises a driving piece, a transmission sleeve, a transmission rod and a limiting piece. The drive member is disposed in the distal end. The transmission sleeve is engaged with the drive member. The transmission sleeve comprises an internal thread. The transmission rod is arranged in the transmission sleeve and is connected with the moving piece. The transmission rod comprises an external thread. And the external thread is meshed with the internal thread of the transmission sleeve. The limiting piece limits rotation of the transmission rod.

Description

Technical Field

[0001] This invention relates to a tubular injection device and a drive mechanism, and more particularly to a tubular injection device and a drive mechanism that can improve injection operation and ensure injection safety. Background Technology

[0002] Current syringes (e.g., auto-injectors or pen injectors) are used for self-administering small amounts of medication in single or multiple doses. Most existing syringes are purely mechanical, driven by mechanically pushing the plunger rod of either the cartridge or the syringe. Furthermore, to transfer the medication from the vial to the syringe, the user needs to hold the vial relative to the syringe and manually pull the plunger rod. This manual operation is inconvenient for the average user and can compromise injection safety due to potential misoperation. Summary of the Invention

[0003] The present invention provides a tubular injection device and drive mechanism that can improve injection operation and ensure injection safety, so as to solve the above-mentioned problems.

[0004] According to one embodiment, the tubular injection device of the present invention has a proximal end and a distal end. The tubular injection device includes a drug storage container, an injection container, a movable component, and a drive mechanism. The injection container is disposed at the proximal end and is in fluid communication with the drug storage container. The movable component is movably disposed within the drug storage container. The drive mechanism includes a drive member, a transmission sleeve, a transmission rod, and a restraining member. The drive member is disposed at the distal end. The transmission sleeve engages with the drive member. The transmission sleeve includes an internal thread. The transmission rod is disposed within the transmission sleeve and engages with the movable component. The transmission rod includes an external thread. The external thread engages with the internal thread of the transmission sleeve. The restraining member restricts rotation of the transmission rod. The drive member drives the transmission sleeve to rotate, the transmission sleeve drives the transmission rod to move through the interaction of the internal and external threads, and the transmission rod drives the movable component to move relative to the drug storage container.

[0005] In one embodiment, when the driving member drives the transmission sleeve to rotate in a first direction, the transmission rod moves linearly toward the proximal end and drives the moving member to move toward the injection piece.

[0006] In one embodiment, when the driving member drives the transmission sleeve to rotate in a second direction, the transmission rod drives the moving member to move away from the injection piece. The first direction is opposite to the second direction.

[0007] In one embodiment, the transmission rod has a first limiting surface, the limiting member has a through hole, the through hole has a second limiting surface, one end of the transmission rod passes through the through hole, and the limiting member restricts the rotation of the transmission rod through the first limiting surface and the second limiting surface.

[0008] In one embodiment, the drive mechanism further includes a nut fitted into the transmission sleeve. The internal thread is provided by the nut.

[0009] In one embodiment, the tubular injection device further includes a first housing in which the drug storage element is housed.

[0010] In one embodiment, the tubular injection device further includes a second housing, wherein the first housing and the second housing are assembled to accommodate the drug storage member and the drive mechanism, and the limiting member includes a flange sandwiched between the first housing and the second housing.

[0011] In one embodiment, the tubular injection device further includes a second housing and a third housing, wherein the first housing and the second housing are assembled to house the drug storage member, the transmission sleeve, the transmission rod and the limiting member, the limiting member including a flange sandwiched between the first housing and the second housing, the third housing being detachably engaged with the second housing, the drive member being housed in the third housing, the drive member including a transmission portion being detachably engaged with the transmission sleeve.

[0012] In one embodiment, the tubular injection device further includes a second housing, wherein the drive mechanism is housed in the second housing, the second housing is detachably engaged with the first housing, and the drive rod is detachably engaged with the movable member.

[0013] In one embodiment, the tubular injection device further includes a cap configured to cover the first housing.

[0014] In one embodiment, the tubular injection device further includes an adapter configured to be assembled to the first housing, wherein when a drug container is loaded in the adapter, the injection element pierces the drug container.

[0015] In one embodiment, the drug storage device is a cartridge, and the injection device is a pen needle detachably disposed on the proximal end of the tubular injection device.

[0016] In one embodiment, the drug reservoir and the injection element are combined to form a pre-filled syringe, the injection element extending from the proximal end of the tubular injection device.

[0017] In one embodiment, the injection element, the drug storage element, the moving element, and the drive mechanism are arranged along a longitudinal axis of the tubular injection device to form a handheld syringe.

[0018] According to one embodiment, the drive mechanism of the present invention includes a drive member, a transmission sleeve, a transmission rod, and a limiting member. The drive member is disposed in the distal end. The transmission sleeve engages with the drive member. The transmission sleeve includes an internal thread. The transmission rod is disposed in the transmission sleeve and engages with the movable member. The transmission rod includes an external thread. The external thread engages with the internal thread of the transmission sleeve. The limiting member restricts rotation of the transmission rod. The drive member drives the transmission sleeve to rotate, and the transmission sleeve drives the transmission rod to move through the interaction of the internal thread and the external thread.

[0019] In one embodiment, when the driving member drives the transmission sleeve to rotate in a first direction, the transmission sleeve drives the transmission rod to move out of the transmission sleeve.

[0020] In one embodiment, when the driving member drives the transmission sleeve to rotate in a second direction, the transmission sleeve drives the transmission rod to move into the transmission sleeve. The first direction is opposite to the second direction.

[0021] In one embodiment, the transmission rod has a first limiting surface, the limiting member has a through hole, the through hole has a second limiting surface, one end of the transmission rod passes through the through hole, and the limiting member restricts the rotation of the transmission rod through the first limiting surface and the second limiting surface.

[0022] In one embodiment, the drive mechanism further includes a nut fitted into the transmission sleeve. The internal thread is provided by the nut.

[0023] In one embodiment, the drive member includes a transmission portion that is detachably engaged with the transmission sleeve.

[0024] In summary, the tubular injection device of the present invention utilizes a drive mechanism to move a moving component relative to a drug storage container to achieve automated drug injection. Therefore, the user does not need to manually pull or push the moving component. Thus, the tubular injection device of the present invention allows for automated drug injection with minimal manual operation, thereby improving injection procedures and ensuring injection safety by minimizing human error. In one embodiment, the tubular injection device of the present invention may be equipped with an adapter for loading a drug container, allowing the drug solution to be automatically transferred from the drug container to the drug storage container by actuation of the drive mechanism. Therefore, the tubular injection device of the present invention provides automated operation, replacing the manual operation of transferring the drug from the drug container to the tubular injection device, thereby allowing non-professionals to administer medication themselves.

[0025] The advantages and spirit of the present invention can be further understood from the following detailed description of the invention and the accompanying drawings. Attached Figure Description

[0026] Figure 1This is a perspective view of a tubular injection device according to an embodiment of the present invention.

[0027] Figure 2 This is a cross-sectional view of a tubular injection device.

[0028] Figure 3 This is a cross-sectional view showing the movement of the moving part toward the injection part.

[0029] Figure 4 This is a 3D view of the drive mechanism.

[0030] Figure 5 This is an exploded view of the drive mechanism.

[0031] Figure 6 This is a cross-sectional view of a tubular injection device according to an embodiment of the present invention.

[0032] Figure 7 This is an exploded cross-sectional view of a tubular injection device.

[0033] Figure 8 This is an exploded view of the drive mechanism.

[0034] Figure 9 This is a cross-sectional view of a tubular injection device according to an embodiment of the present invention.

[0035] Figure 10 This is an exploded cross-sectional view of a tubular injection device.

[0036] Figure 11 This is a cross-sectional view of a tubular injection device according to an embodiment of the present invention.

[0037] Figure 12 This is a cross-sectional view of a tubular injection device according to an embodiment of the present invention.

[0038] Figure 13 This is a cross-sectional view of a tubular injection device according to an embodiment of the present invention.

[0039] The reference numerals in the attached figures are explained as follows:

[0040] 1,2,3,4,5,6: Tubular injection device

[0041] 7: Medicine container

[0042] 10: Drug storage components

[0043] 12: Injection parts

[0044] 14: Moving parts

[0045] 16: Drive mechanism

[0046] 18: First shell

[0047] 20: Second shell

[0048] 22: Third shell

[0049] 40: Cover

[0050] 50: Adapter

[0051] 60: Pre-filled syringe

[0052] 160: Drive components

[0053] 162: Transmission sleeve

[0054] 164: Transmission rod

[0055] 166: Restrictive components

[0056] 168: Nut

[0057] 500: Sleeve section

[0058] 1600: Transmission Unit

[0059] 1602: First joint structure

[0060] 1620: Internal thread

[0061] 1622: Second joint structure

[0062] 1640: External thread

[0063] 1642: First limiting surface

[0064] 1660: Through hole

[0065] 1662: Second limiting surface

[0066] 1664: Flange

[0067] C1: First Chamber

[0068] C2: Second Chamber

[0069] D1: First Direction

[0070] D2: Second Direction

[0071] E1: Proximal end

[0072] E2: Remote

[0073] LA: Longitudinal axis Detailed Implementation

[0074] Please see Figures 1 to 5 , Figure 1 This is a perspective view of a tubular injection device 1 according to an embodiment of the present invention. Figure 2 This is a cross-sectional view of the tubular injection device 1. Figure 3 This is a cross-sectional view showing the movement of the movable part 14 toward the injection part 12. Figure 4 This is a perspective view of the drive mechanism 16. Figure 5 This is an exploded view of the drive mechanism 16.

[0075] like Figures 1 to 3 As shown, the tubular injection device 1 has a proximal end E1 and a distal end E2, and includes a drug storage unit 10, an injection unit 12, a moving part 14, a drive mechanism 16, a first housing 18, and a second housing 20. The first housing 18 and the second housing 20 are assembled to house the drug storage unit 10, the moving part 14, and the drive mechanism 16. In other words, the drug storage unit 10, the moving part 14, and the drive mechanism 16 are housed in the cavity formed by the first housing 18 and the second housing 20. In this embodiment, the injection unit 12, the drug storage unit 10, the moving part 14, and the drive mechanism 16 are arranged along a longitudinal axis LA of the tubular injection device 1 to form a handheld syringe, allowing the user to easily perform the injection procedure by holding the tubular injection device 1.

[0076] The injection element 12 is disposed at the proximal end E1 of the tubular injection device 1 and is in fluid communication with the drug storage unit 10. The movable element 14 is movably disposed within the drug storage unit 10. In this embodiment, the injection element 12 may be an injection needle or similar element, and the drug storage unit 10 may be a syringe, cartridge, or similar element. For example, the drug storage unit 10 may be a cartridge, and the injection element 12 may be a pen needle, detachably disposed at the proximal end E1 of the tubular injection device 1. The movable element 14 may be a plunger, but is not limited thereto.

[0077] The drive mechanism 16 includes a drive member 160, a transmission sleeve 162, a transmission rod 164, and a limiting member 166. The drive member 160 is disposed in the distal end E2 of the tubular injection device 1. In this embodiment, the drive member 160 may be a motor or a similar element. The transmission sleeve 162 engages with the drive member 160, such that the drive member 160 can drive the transmission sleeve 162 to rotate. The transmission rod 164 is disposed in the transmission sleeve 162 and engages with the movable member 14. Furthermore, the transmission sleeve 162 includes an internal thread 1620, and the transmission rod 164 includes an external thread 1640, wherein the external thread 1640 engages with the internal thread 1620 of the transmission sleeve 162. Therefore, the transmission sleeve 162 can drive the transmission rod 164 to move through the interaction of the internal thread 1620 and the external thread 1640, and the transmission rod 164 can drive the movable member 14 to move relative to the drug storage member 10.

[0078] In this embodiment, the drive mechanism 16 may further include a nut 168, which is embedded in the transmission sleeve 162, and the internal thread 1620 may be provided by the nut 168. However, the invention is not limited thereto. For example, in another embodiment, the internal thread 1620 may be formed on the inner wall of the transmission sleeve 162, so that the nut 168 may be omitted. When the internal thread 1620 is formed on the inner wall of the transmission sleeve 162, the length of the internal thread 1620 may be less than or equal to the length of the transmission sleeve 162, depending on the actual application.

[0079] The limiting member 166 is configured to restrict the rotation of the transmission rod 164. In this embodiment, the transmission rod 164 may have a first limiting surface 1642, the limiting member 166 may have a through hole 1660, and the through hole 1660 may have a second limiting surface 1662, such as... Figure 4 and Figure 5 As shown. One end of the transmission rod 164 passes through the through hole 1660 of the limiting member 166, allowing the limiting member 166 to restrict the rotation of the transmission rod 164 via the first limiting surface 1642 and the second limiting surface 1662. In this embodiment, the limiting member 166 may include a flange 1664. Figure 2 and Figure 3 As shown, the flange 1664 can be clamped between the first housing 18 and the second housing 20 to restrict the rotation and movement of the limiting member 166. However, the invention is not limited thereto. For example, in another embodiment, the limiting member 166 can be fixed by snap-fit ​​or other mechanical means, so that the flange 1664 can be omitted.

[0080] like Figure 3 As shown, when the drive member 160 drives the transmission sleeve 162 to rotate along a first direction D1 (for example, the output shaft of the drive member 160 rotates counterclockwise), the transmission rod 164 can be driven by the transmission sleeve 162 to move linearly toward the proximal end E1 of the tubular injection device 1, and the drive moving member 14 moves toward the injection member 12. Figure 2 As shown, when the drive member 160 drives the transmission sleeve 162 to rotate along a second direction D2 (for example, the output shaft of the drive member 160 rotates clockwise), the transmission rod 164 can be driven by the transmission sleeve 162 to move linearly in a direction away from the proximal end E1 of the tubular injection device 1, and the driving moving member 14 moves in a direction away from the injection member 12. The first direction D1 is opposite to the second direction D2. That is, the first direction D1 can be counterclockwise and the second direction D2 can be clockwise, or the first direction D1 can be clockwise and the second direction D2 can be counterclockwise. In this way, the tubular injection device 1 of the present invention uses the drive mechanism 16 to drive the moving member 14 to move relative to the drug storage member 10 to achieve automatic drug injection. Therefore, the user does not need to manually pull or push the moving member 14 to move.

[0081] Please see Figures 6 to 8 , Figure 6 This is a cross-sectional view of a tubular injection device 2 according to an embodiment of the present invention. Figure 7 This is an exploded cross-sectional view of the tubular injection device 2. Figure 8 This is an exploded view of the drive mechanism 16.

[0082] The main difference between the tubular injection device 2 and the tubular injection device 1 described above is that the tubular injection device 2 further includes a third housing 22, such as... Figure 6 and Figure 7 As shown. In this embodiment, the first housing 18 and the second housing 20 are assembled to house the drug storage component 10, the movable component 14, the transmission sleeve 162, the transmission rod 164, and the limiting component 166, wherein the flange 1664 of the limiting component 166 is also sandwiched between the first housing 18 and the second housing 20. The driving component 160 is housed in the third housing 22. The third housing 22 is detachably engaged with the second housing 20. The driving component 160 includes a transmission portion 1600, and the transmission portion 1600 is detachably engaged with the transmission sleeve 162. Figure 8 As shown, the transmission part 1600 may have a first engagement structure 1602, and the transmission sleeve 162 may have a second engagement structure 1622, such that the transmission part 1600 can be detachably engaged with the transmission sleeve 162 through the engagement of the first engagement structure 1602 and the second engagement structure 1622. Therefore, the third housing 22 and the drive member 160 can be detached from the second housing 20 after injection, such as... Figure 7 As shown.

[0083] In this embodiment, the first housing 18 and the second housing 20 can be assembled to form a first chamber C1 for accommodating the drug storage component 10, the movable component 14, the transmission sleeve 162, the transmission rod 164, and the limiting component 166. The third housing 22 can form a second chamber C2 for accommodating the driving component 160. Therefore, the second chamber C2 can be detached from the first chamber C1 after injection. Figure 7 As shown. The first chamber C1 with related elements can be used once after injection, while the second chamber C2 with related elements can be used once or repeatedly after injection.

[0084] Please see Figure 9 as well as Figure 10 , Figure 9 This is a cross-sectional view of a tubular injection device 3 according to an embodiment of the present invention. Figure 10 This is an exploded cross-sectional view of the tubular injection device 3.

[0085] The main difference between the tubular injection device 3 and the tubular injection device 1 described above is that the drive mechanism 16 of the tubular injection device 3 is housed in the second housing 20, as shown below. Figure 9 and Figure 10As shown. In this embodiment, the second housing 20 is detachably engaged with the first housing 18, and the transmission rod 164 is detachably engaged with the moving member 14. Furthermore, the limiting member 166 can be fixed to the second housing 20 by snap-fit ​​or other mechanical means, thus eliminating the need for the aforementioned flange 1664.

[0086] In this embodiment, the first housing 18 can form a first chamber C1 for accommodating the drug storage member 10 and the movable member 14, and the second housing 20 can form a second chamber C2 for accommodating the drive mechanism 16. Therefore, the second chamber C2 can be detached from the first chamber C1 after injection, such as... Figure 10 As shown. The first chamber C1 with related elements can be used once after injection, while the second chamber C2 with related elements can be used once or repeatedly after injection.

[0087] Please see Figure 11 , Figure 11 This is a cross-sectional view of a tubular injection device 4 according to an embodiment of the present invention.

[0088] The main difference between the tubular injection device 4 and the tubular injection device 2 described above is that the tubular injection device 4 further includes a cover 40, such as... Figure 11 As shown. The cover 40 is configured to cover the first housing 18 and the injection element 12. It should be noted that the cover 40 can also be applied to the tubular injection devices 1 and 3 described above.

[0089] Please see Figure 12 , Figure 12 This is a cross-sectional view of a tubular injection device 5 according to an embodiment of the present invention.

[0090] The main difference between the tubular injection device 5 and the tubular injection device 2 described above is that the tubular injection device 5 further includes an adapter 50, such as... Figure 12 As shown. Adapter 50 is configured to assemble into the first housing 18. When a user wishes to perform an injection procedure using the tubular injection device 5, the user can load a drug container 7 (e.g., a vial) into the adapter 50, such as... Figure 12 As shown. In this embodiment, the adapter 50 may include a sleeve 500 for holding the medicine container 7. Furthermore, the sleeve 500 may be transparent or include a window to allow the user to observe the medicine container 7 contained in the adapter 50 and the liquid medicine within it.

[0091] When the drug container 7 is loaded into the adapter 50, the injection element 12 inserts into the drug container 7. The user can then actuate the drive mechanism 16 to move the moving element 14, thereby transferring the medication from the drug container 7 to the drug storage unit 10 via the injection element 12. It should be noted that the adapter 50 can also be used in the aforementioned tubular injection devices 1 and 3.

[0092] Please see Figure 13 , Figure 13 This is a cross-sectional view of a tubular injection device 6 according to an embodiment of the present invention.

[0093] The main difference between the tubular injection device 6 and the tubular injection device 2 described above is that the drug storage unit 10 and the injection unit 12 of the tubular injection device 6 are combined to form a pre-filled syringe 60, such as... Figure 13 As shown. The injection element 12 extends from the proximal end E1 of the tubular injection device 6 for injection. It should be noted that the pre-filled syringe 60 can also be used in the tubular injection devices 1 and 3 described above.

[0094] In summary, the tubular injection device of the present invention utilizes a drive mechanism to move a moving component relative to a drug storage container to achieve automated drug injection. Therefore, the user does not need to manually pull or push the moving component. Thus, the tubular injection device of the present invention allows for automated drug injection with minimal manual operation, thereby improving injection procedures and ensuring injection safety by minimizing human error. In one embodiment, the tubular injection device of the present invention may be equipped with an adapter for loading a drug container, allowing the drug solution to be automatically transferred from the drug container to the drug storage container by actuation of the drive mechanism. Therefore, the tubular injection device of the present invention provides automated operation, replacing the manual operation of transferring the drug from the drug container to the tubular injection device, thereby allowing non-professionals to administer medication themselves.

[0095] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A tubular injection device having a proximal end and a distal end, characterized in that, The tubular injection device includes: A drug storage container; An injection device disposed at the proximal end and in fluid communication with the drug storage device; a movable member movably disposed in the drug storage device; and a drive mechanism comprising: A driving element is disposed in the distal end; A transmission sleeve engages with the driving component, the transmission sleeve including an internal thread; A transmission rod, disposed within the transmission sleeve and engaging with the moving member, the transmission rod including an external thread that meshes with the internal thread of the transmission sleeve; and A limiting component restricts the rotation of the transmission rod. The driving component drives the transmission sleeve to rotate, the transmission sleeve drives the transmission rod to move through the interaction of the internal thread and the external thread, and the transmission rod drives the moving component to move relative to the drug storage component.

2. The tubular injection device as described in claim 1, characterized in that, When the driving member drives the transmission sleeve to rotate in a first direction, the transmission rod moves linearly toward the proximal end and drives the moving member to move toward the injection part.

3. The tubular injection device as described in claim 2, characterized in that, When the driving member drives the transmission sleeve to rotate in a second direction, the transmission rod drives the moving member to move away from the injection member; the first direction is opposite to the second direction.

4. The tubular injection device as described in claim 1, characterized in that, The transmission rod has a first limiting surface, the limiting member has a through hole, the through hole has a second limiting surface, one end of the transmission rod passes through the through hole, and the limiting member restricts the rotation of the transmission rod through the first limiting surface and the second limiting surface.

5. The tubular injection device as described in claim 1, characterized in that, The drive mechanism also includes a nut, which is embedded in the transmission sleeve, and the internal thread is provided by the nut.

6. The tubular injection device as described in claim 1, characterized in that, It also includes a first housing, wherein the drug storage device is housed within the first housing.

7. The tubular injection device as described in claim 6, characterized in that, It also includes a second housing, wherein the first housing and the second housing are assembled to accommodate the drug storage device and the drive mechanism, and the limiting member includes a flange that is sandwiched between the first housing and the second housing.

8. The tubular injection device as described in claim 6, characterized in that, It also includes a second housing and a third housing, wherein the first housing and the second housing are assembled to house the drug storage component, the transmission sleeve, the transmission rod and the limiting member, the limiting member including a flange sandwiched between the first housing and the second housing, the third housing being detachably engaged with the second housing, the drive member being housed in the third housing, the drive member including a transmission portion being detachably engaged with the transmission sleeve.

9. The tubular injection device as described in claim 6, characterized in that, It also includes a second housing, wherein the drive mechanism is housed in the second housing, the second housing is detachably engaged with the first housing, and the transmission rod is detachably engaged with the moving member.

10. The tubular injection device as described in claim 6, characterized in that, It also includes a cover configured to cover the first housing.

11. The tubular injection device as claimed in claim 6, characterized in that, It also includes an adapter configured to assemble into the first housing, wherein when a drug container is loaded in the adapter, the injection element punctures the drug container.

12. The tubular injection device as claimed in claim 1, characterized in that, The drug storage device is a cartridge, and the injection device is a pen needle, which is detachably mounted on the proximal end of the tubular injection device.

13. The tubular injection device as claimed in claim 1, characterized in that, The drug storage device and the injection device are combined to form a pre-filled syringe, the injection device extending from the proximal end of the tubular injection device.

14. The tubular injection device as claimed in claim 1, characterized in that, The injection element, the drug storage element, the moving element, and the drive mechanism are arranged along a longitudinal axis of the tubular injection device to form a handheld syringe.

15. A driving mechanism, characterized in that, include: A driving element is disposed in the distal end; A transmission sleeve engages with the driving component, the transmission sleeve including an internal thread; A transmission rod, disposed within the transmission sleeve and engaging with the moving member, the transmission rod including an external thread that meshes with the internal thread of the transmission sleeve; and A limiting component restricts the rotation of the transmission rod; The driving component drives the transmission sleeve to rotate, and the transmission sleeve drives the transmission rod to move through the interaction of the internal thread and the external thread.

16. The driving mechanism as described in claim 15, characterized in that, When the driving member drives the transmission sleeve to rotate in a first direction, the transmission sleeve drives the transmission rod to move out of the transmission sleeve.

17. The driving mechanism as described in claim 16, characterized in that, When the driving member drives the transmission sleeve to rotate in a second direction, the transmission sleeve drives the transmission rod to move into the transmission sleeve; the first direction is opposite to the second direction.

18. The drive mechanism as described in claim 15, characterized in that, The transmission rod has a first limiting surface, the limiting member has a through hole, the through hole has a second limiting surface, one end of the transmission rod passes through the through hole, and the limiting member restricts the rotation of the transmission rod through the first limiting surface and the second limiting surface.

19. The driving mechanism as described in claim 15, characterized in that, The drive mechanism also includes a nut, which is embedded in the transmission sleeve, and the internal thread is provided by the nut.

20. The driving mechanism as described in claim 15, characterized in that, The drive unit includes a transmission part that is detachably engaged with the transmission sleeve.

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