Porous micro-fracture planetary drill bit

Abstract

A porous micro-fracture planetary drill bit relates to the field of medical equipment and comprises an outer pipe, a driving shaft, a transmission assembly and a plurality of drill bit bodies. The driving shaft and the plurality of drill bit bodies are arranged in the outer pipe in a penetrating manner; the transmission assembly is in transmission connection with the drill bit bodies at the same time. The drive shaft is connected with one of the multiple drill bit bodies, and the drive shaft is matched with the transmission assembly so as to transmit torque to each drill bit body. By means of the structural design of the drill bit, a plurality of holes which are evenly distributed and consistent in depth can be obtained at the same time, bone walls are not prone to being formed, iatrogenic fractures caused by overlapping of drilling positions and angles are not prone to being caused, and therefore the treatment effect can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and more specifically, to a porous microfracture planetary drill bit. Background Technology

[0002] Articular cartilage injury is a common disease in joint surgery, caused by multiple factors such as mechanical trauma or inflammation. Due to the lack of blood vessels in cartilage tissue and the weak repair capacity of nerves and chondrocytes, the repair and treatment of articular cartilage remains one of the most pressing clinical problems. Microfracture is a minimally invasive surgical technique performed entirely arthroscopically. Currently, microfracture conduits are commonly used to create microfractures on the exposed subchondral bone sclerosis surface, allowing bone marrow components to leak out and promoting articular cartilage repair. In arthroscopic surgery, the drilling depth is approximately 3mm, and the drilling spacing is controlled at 3-4mm. Because the conduit compresses the bone under mechanical force, forming a closed "bone wall," it affects the entry and exit of active bone marrow cells. Furthermore, the 3mm superficial bone marrow channel fails to reach the deeper bone marrow, thus affecting clinical efficacy. In addition, cartilage repair usually requires the creation of multiple microfractures in the cartilage defect area. Current conduits are not conducive to controlling the angle, spacing, and depth, easily causing microfracture fragmentation, destruction of the subchondral bone biomechanical structure, and iatrogenic fractures. Utility Model Content

[0003] The purpose of this invention includes, for example, providing a multi-hole microfracture planetary drill bit that can simultaneously obtain multiple holes of uniform distribution and consistent depth, making it less likely to form bone walls and less likely to cause iatrogenic fractures due to overlapping drilling positions and angles, thereby effectively improving treatment outcomes.

[0004] The embodiments of this utility model can be implemented as follows:

[0005] In a first aspect, this utility model provides a porous microfracture planetary drill bit, comprising an outer tube, a drive shaft, a transmission assembly, and multiple drill bit bodies, wherein:

[0006] The drive shaft and the multiple drill bit bodies are both inserted into the outer tube; the transmission assembly is simultaneously connected to the multiple drill bit bodies; the drive shaft is connected to one of the drill bit bodies, and the drive shaft cooperates with the transmission assembly to transmit torque to each drill bit body respectively.

[0007] In an optional embodiment, the transmission assembly includes multiple transmission gears, which are respectively connected to the multiple drill bit bodies one by one, and the corresponding two transmission gears mesh; when the drive shaft drives one of the drill bit bodies to rotate, the remaining drill bit bodies rotate under the cooperation of the multiple transmission gears.

[0008] In an optional embodiment, one of the plurality of transmission gears is a driving gear, and the remaining transmission gears are driven gears, all of which mesh with the driving gear; the drive shaft is connected to the drill bit body on which the driving gear is mounted.

[0009] In an optional embodiment, a plurality of the driven gears are arranged at intervals around the axis of the driving gear.

[0010] In an alternative embodiment, at least two of the plurality of driven gears are spaced apart in the axial direction of the drive shaft.

[0011] In an optional embodiment, the drive shaft includes a first shaft body, a first flexible snake-like tube, and a second shaft body, wherein the first shaft body, the first flexible snake-like tube, and the second shaft body are connected in sequence, the first shaft body is used to transmit torque to the second shaft body through the first flexible snake-like tube, and the second shaft body is connected to one of the plurality of drill bit bodies.

[0012] In an optional embodiment, the transmission assembly further includes multiple drive shafts and multiple second snake-shaped flexible hoses, wherein the multiple drive shafts are connected to the multiple second snake-shaped flexible hoses in a one-to-one correspondence, and the multiple second snake-shaped flexible hoses are connected to the multiple drill bit bodies in a one-to-one correspondence. The transmission gear is mounted on the corresponding drive shaft; the second snake-shaped flexible hose is used to transmit the torque of the drive shaft to the corresponding drill bit body.

[0013] In an optional embodiment, a portion of the outer tube is configured as an adjustable-angle deformable tube; the position of the first or second snake-bone flexible tube corresponds to the position of the deformable tube.

[0014] In an optional embodiment, the porous microfracture planetary drill bit further includes a carrier, on which multiple drill bit bodies are mounted, each drill bit body is rotatably connected to the carrier, and each drill bit body is fixed relative to the carrier in its own axial direction; the drive shaft is rotatably engaged with the carrier; the carrier and the outer tube are slidably engaged in the extension direction of the outer tube, and the carrier and the outer tube are fixed relative to each other in the circumferential direction of the outer tube.

[0015] In an optional embodiment, the outer tube has multiple guide strips on its wall, and the multiple guide strips are arranged at intervals around the axis of the outer tube; the carrier is located in the area enclosed by the multiple guide strips and is engaged with the multiple guide strips at the same time, and the carrier and the guide strips slide in the extension direction of the guide strips.

[0016] The beneficial effects of this utility model embodiment include, for example:

[0017] In summary, the multi-hole microfracture planetary drill bit provided in this embodiment can connect the drive shaft to a power source such as a motor. After the outer tube is placed in the set position of the treatment target with the arthroscope, the motor is started. The motor transmits torque to one of the multiple drill bit bodies, driving that drill bit body to rotate. Furthermore, with the cooperation of the transmission component, the torque can be transmitted to each of the remaining drill bit bodies. In this way, multiple drill bit bodies can be driven to rotate simultaneously through a single drive shaft. Multiple drill bit bodies contact the cartilage, enabling drilling operations at multiple positions simultaneously, resulting in high efficiency. The relative positions of the multiple drill bit bodies are fixed, and the relative positions of the multiple holes are fixed during drilling, eliminating the need for repeated positioning and reducing the likelihood of hole overlap or misalignment, thus improving drilling quality and reducing the risk of iatrogenic fractures. Moreover, the drilling method does not easily compact bone tissue, reducing the likelihood of bone wall formation, facilitating the entry and exit of bone marrow active cells, and resulting in good treatment effects. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a porous microfracture planetary drill bit according to an embodiment of this application;

[0020] Figure 2 This is a cross-sectional schematic diagram of a porous microfracture planetary drill bit according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the hidden housing of the porous microfracture planetary drill bit according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram illustrating the cooperation between the transmission assembly and the drill bit body in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the outer casing according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of a modified example of the porous microfracture planetary drill bit according to an embodiment of this application;

[0025] Figure 7 For the corresponding Figure 6 A cross-sectional view;

[0026] Figure 8 This is a schematic diagram illustrating the cooperation between the transmission assembly and the drill bit body in a modified embodiment of this application.

[0027] icon:

[0028] 100-Outer tube; 110-Guide strip; 120-Observation window; 130-Through hole; 200-Drive shaft; 210-First shaft body; 220-First snake-bone flexible hose; 230-Second shaft body; 300-Transmission assembly; 310-Driving gear; 320-Driven gear; 330-Transmission shaft; 340-Second snake-bone flexible hose; 400-Drill bit body; 500-Carrier; 510-Outer cylinder; 520-First end cap; 530-Second end cap; 540-Guide through groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use, they are only for the convenience of describing this utility model 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 utility model.

[0033] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0035] In existing technologies, microfracture surgery uses a hand-drilling method, creating one hole at a time, which is inefficient. Furthermore, the hand-drilling action compacts the bone, forming a closed "bone wall" that hinders the entry and exit of active bone marrow cells. The holes obtained by the hand-drilling method are also shallow, failing to reach deeper bone marrow, thus affecting clinical efficacy. In some clinical settings, drilling is used for microfracture surgery, typically using a single drill bit, which is inefficient and difficult to position. When multiple holes need to be drilled, misalignment or overlap can easily occur, leading to iatrogenic fractures.

[0036] In view of this, the designers have provided a multi-hole microfracture planetary drill bit that can simultaneously obtain multiple holes, resulting in high drilling efficiency, high quality, and high efficiency of microfracture surgery.

[0037] Please refer to Figures 1-5 This embodiment provides a multi-hole microfracture planetary drill bit, including an outer tube 100, a drive shaft 200, a transmission assembly 300, and multiple drill bit bodies 400. The drive shaft 200 and the multiple drill bit bodies 400 are both housed within the outer tube 100; the transmission assembly 300 is simultaneously connected to the multiple drill bit bodies 400; the drive shaft 200 is connected to one of the drill bit bodies 400, and the drive shaft 200 cooperates with the transmission assembly 300 to transmit torque to each drill bit body 400 respectively.

[0038] As described above, the working principle of the porous microfracture planetary drill bit provided in this embodiment is as follows:

[0039] First, the front end of the outer tube 100 can be placed into the designated position of the target to be treated using arthroscopy. Then, the drive shaft 200 can be connected to a power source device such as a motor, and the motor can be started. The motor transmits torque to one of the multiple drill bit bodies 400, causing that drill bit body 400 to rotate. Furthermore, with the cooperation of the transmission component 300, the torque can be transmitted to each of the remaining drill bit bodies 400. In this way, multiple drill bit bodies 400 can be rotated simultaneously by one drive shaft 200. When the multiple drill bit bodies 400 come into contact with the cartilage, the external force applied when the drill bit bodies 400 rotate causes the motor, drive shaft 200, and multiple drill bit bodies 400 to have an axial movement tendency, that is, the drill bit bodies 400 move towards the inside of the cartilage, thereby enabling drilling operations at multiple positions simultaneously, resulting in high drilling efficiency. Because the relative positions of the multiple drill bits are fixed at 400mm, the relative positions of the multiple holes are also fixed during drilling, eliminating the need for repeated positioning and reducing the likelihood of overlapping or misalignment of holes. This improves drilling quality and reduces the risk of iatrogenic fractures. Furthermore, drilling does not easily compact bone tissue or create bone walls, allowing for convenient entry and exit of active bone marrow cells and resulting in better treatment outcomes.

[0040] The following embodiments illustrate the details of the porous microfracture planetary drill bit of this application by way of example.

[0041] Please refer to Figures 1-5 In this embodiment, optionally, the multi-hole microfracture planetary drill bit includes an outer tube 100, a drive shaft 200, a transmission assembly 300, multiple drill bit bodies 400, and a carrier 500. The carrier 500 is installed inside the outer tube 100, and the carrier 500 and the outer tube 100 are slidably fitted together without relative rotation. Both the drive shaft 200 and the multiple drill bit bodies 400 are rotatably mounted on the carrier 500, and neither the drive shaft 200 nor the drill bit bodies 400 slide relative to the carrier 500 in the extending direction of the outer tube 100. The transmission assembly 300 is connected to the multiple drill bit bodies 400. The drive shaft 200 is connected to one of the multiple drill bit bodies 400, enabling it to directly drive one drill bit body 400 to rotate, thereby driving the remaining drill bit bodies 400 to rotate together via the multiple transmission assemblies 300, achieving the function of drilling multiple holes simultaneously.

[0042] In this embodiment, optionally, the outer tube 100 can be configured as a flexible tube, or a portion of the outer tube 100 can be configured as a flexible tube. For example, in this embodiment, a portion of the outer tube 100 can be configured as a flexible tube, which can be called a deformable tube. By bending the deformable tube, the orientation of the front end of the outer tube 100 can be adjusted, thereby changing the drilling direction of the multiple drill bit bodies 400 and adapting to drilling requirements at different angles.

[0043] Please combine Figure 1 and Figure 5 Meanwhile, multiple guide strips 110 are provided on the wall of the outer tube 100. These guide strips 110 are evenly spaced around the axis of the outer tube 100. For example, in this embodiment, there are four guide strips 110. Furthermore, an observation window 120 is formed between adjacent guide strips 110 in the circumferential direction of the outer tube 100. This observation window 120 connects to the cavity of the outer tube 100. The carrier 500 is located at the observation window 120, allowing direct observation of the carrier 500's position from the observation window 120, thereby obtaining the positions of the multiple drill bit bodies 400 and determining whether the drilling operation is proceeding smoothly.

[0044] In addition, to improve the stability of the drill bit body 400, multiple through holes 130 can be provided at the front end of the outer tube 100. The number of through holes 130 is equal to the number of drill bit bodies 400. Each drill bit body 400 can extend out of the front end of the outer tube 100 or retract into the outer tube 100 through the through holes 130.

[0045] Please refer to Figure 1 and Figure 3Optionally, the carrier 500 includes an outer cylinder 510, a first end cap 520, and a second end cap 530. The outer cylinder 510 is generally cylindrical, and four guide grooves 540 are provided on its outer circumferential surface. The four guide grooves 540 are parallel and evenly spaced around the axis of the outer cylinder 510. The outer cylinder 510 is located within the area enclosed by four guide bars 110. The four guide grooves 540 are respectively engaged with the four guide bars 110, so that the carrier 500 can slide along the guide bars 110 but will not rotate relative to the outer tube 100 around its own axis. The first end cap 520 and the second end cap 530 are both connected to the outer cylinder 510 and respectively close the two axial ports of the outer cylinder 510. Thus, an installation chamber is formed inside the carrier 500, which can accommodate the transmission assembly 300 and the drill bit body 400, etc.

[0046] Meanwhile, the first end cap 520 is provided with multiple first positioning holes, and the second end cap 530 is provided with multiple second positioning holes. The number of first positioning holes and second positioning holes are equal and they correspond one-to-one. Each first positioning hole is coaxial with its corresponding second positioning hole, and the cooperating first positioning holes and second positioning holes are used to install one drill bit body 400. For example, the drill bit body 400 can be rotatably engaged with both the first positioning holes and the second positioning holes through bearings. In this way, the drill bit body 400 can only rotate relative to the carrier 500 and will not slide axially relative to the carrier 500.

[0047] It should be understood that the number of the first positioning hole and the second positioning hole can both be 5 or 7, etc.

[0048] Furthermore, the arrangement of the multiple first positioning holes and multiple second positioning holes can be designed to be the same. For example, one of the first positioning holes is located in the middle, and the remaining first positioning holes are distributed around the central first positioning hole and evenly spaced. In this way, the arrangement of the multiple drill bit bodies 400 is determined, with one drill bit body 400 in the middle and the remaining drill bit bodies 400 distributed around it. This facilitates the arrangement of the transmission assembly 300 and the multiple drill bit bodies 400, makes reasonable use of the internal space of the outer tube 100, improves the structural compactness, reduces the diameter of the outer tube 100, and is beneficial for drilling in confined spaces.

[0049] In addition, both the first end cap 520 and the second end cap 530 can be detachably connected to the outer cylinder 510 for easy assembly.

[0050] Please refer to Figure 1 and Figure 3In this embodiment, optionally, the drive shaft 200 includes a first shaft body 210, a first flexible snake-like tube 220, and a second shaft body 230. The first shaft body 210, the first flexible snake-like tube 220, and the second shaft body 230 are connected sequentially. The first shaft body 210 is used to transmit torque to the second shaft body 230 through the first flexible snake-like tube 220. The second shaft body 230 is connected to one of the multiple drill bit bodies 400. For example, the second shaft body 230 can be connected to the drill bit body 400 located in the middle, or the second shaft body 230 can be directly integrated with the drill bit body 400 located in the middle. In use, the first shaft body 210 can be connected to a power source such as a motor to realize power input. By setting a first flexible snake-like tube 220, and positioning the first flexible snake-like tube 220 in a manner corresponding to the position of the deformable tube body, the first flexible snake-like tube 220 adapts to bending when the front end orientation of the outer tube 100 is adjusted. This allows for adjustment of the front end positions of multiple drill bit bodies 400, enabling drilling from different directions. Simultaneously, the first flexible snake-like tube 220 contacts the inner wall of the outer tube 100, which restricts the axial compression of the first flexible snake-like tube 220. When axial force is applied to the motor, it is transmitted to the carrier 500 via the first shaft 210, the first flexible snake-like tube 220, and the second shaft 230. The carrier 500 then simultaneously drives the axial movement of multiple drill bit bodies 400, achieving drilling.

[0051] Please combine Figure 1 and Figure 4 In this embodiment, optionally, the transmission assembly 300 includes multiple transmission gears, the number of which is equal to the number of drill bit bodies 400, such as 5 or 7. The transmission gear connected to the central drill bit body 400 can be called the driving gear 310, and the transmission gears connected to the surrounding drill bit bodies 400 can be called driven gears 320. All driven gears 320 are arranged around the driving gear 310 and mesh with it. The second shaft 230 is connected to the central drill bit body 400. When the central drill bit body 400 rotates, the driven gears 320 can drive all the surrounding drill bit bodies 400 to rotate. Furthermore, when there are a large number of drill bit bodies 400, in order to improve the structural compactness and avoid increasing the outer diameter of the outer tube 100, some of the driven gears 320 can be set to have a gap in the axial direction of the outer tube 100. In this way, the multiple driven gears 320 are not all distributed in the same circumferential direction of the outer tube 100, but are distributed in multiple positions in the axial direction of the outer tube 100. There is no need to reserve space in the circumferential direction between adjacent driven gears 320, thereby reducing the outer diameter of the outer tube 100.

[0052] Please combine Figures 6-8It should be understood that in other embodiments, the angle of the drill bit body 400 can be adjusted through the structural design of the transmission assembly 300. For example, the transmission assembly 300 further includes multiple transmission shafts 330 and multiple second snake-bone hoses 340. The number of transmission shafts 330 and the number of second snake-bone hoses 340 are equal to the number of drill bit bodies 400. Each transmission shaft 330 is connected to a drill bit body 400 through a corresponding second snake-bone hose 340, and a transmission gear is mounted on the corresponding transmission shaft 330. In this way, when the angle of the outer tube 100 is adjusted, each second snake-bone hose 340 can bend adaptively, thereby realizing the angle adjustment of the drill bit body 400.

[0053] The multi-hole microfracture planetary drill bit provided in this embodiment achieves the requirement of uniformly distributed and consistent-depth drilling through multiple transmission gears. Multiple drill bodies 400 can work simultaneously via the rotation of a single drive shaft 200, enabling the drilling of multiple holes at once, resulting in high efficiency, high quality, and good treatment outcomes. Furthermore, when used with a snake-bone flexible tube, it can achieve angled drilling, demonstrating strong adaptability.

[0054] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A porous microfracture planetary drill bit, characterized by, The multiple-hole micro-fracture planetary drill bit comprises an outer tube (100), a driving shaft (200), a transmission assembly (300) and multiple drill bit bodies (400), wherein: The driving shaft (200) and the multiple drill bit bodies (400) are arranged in the outer tube (100); the transmission assembly (300) is in transmission connection with the multiple drill bit bodies (400); the driving shaft (200) is connected with one of the multiple drill bit bodies (400), and the driving shaft (200) cooperates with the transmission assembly (300) to transmit torque to each of the drill bit bodies (400).

2. The multiple-hole micro-fracture planetary drill bit according to claim 1, wherein: The transmission assembly (300) comprises multiple transmission gears, each of which is in one-to-one connection with one of the multiple drill bit bodies (400), and two corresponding transmission gears are in meshing engagement; when the driving shaft (200) drives one of the drill bit bodies (400) to rotate, the remaining drill bit bodies (400) rotate under the cooperation of the multiple transmission gears.

3. The multiple-hole micro-fracture planetary drill bit according to claim 2, wherein: One of the multiple transmission gears is a driving gear (310), and the remaining transmission gears are driven gears (320), all of which are in meshing engagement with the driving gear (310); the driving shaft (200) is connected with the drill bit body (400) on which the driving gear (310) is installed.

4. The multiple-hole micro-fracture planetary drill bit according to claim 3, wherein: The multiple driven gears (320) are arranged at intervals around the axis of the driving gear (310).

5. The multiple-hole micro-fracture planetary drill bit according to claim 4, wherein: At least two of the multiple driven gears (320) have a spacing in the axial direction of the driving shaft (200).

6. The multiple-hole micro-fracture planetary drill bit according to claim 2, wherein: The driving shaft (200) comprises a first shaft body (210), a first serpentine hose (220) and a second shaft body (230), which are connected in sequence, the first shaft body (210) is used to transmit torque to the second shaft body (230) through the first serpentine hose (220), and the second shaft body (230) is connected with one of the multiple drill bit bodies (400).

7. The multiple-hole micro-fracture planetary drill bit according to claim 2, wherein: The transmission assembly (300) further comprises a plurality of transmission shafts (330) and a plurality of second serpentine hoses (340), the plurality of transmission shafts (330) are connected with the plurality of second serpentine hoses (340) one by one, the plurality of second serpentine hoses (340) are connected with the plurality of drill bit bodies (400) one by one, and the transmission gears are mounted on the corresponding transmission shafts (330); the second serpentine hoses (340) are used for transmitting the torque of the transmission shafts (330) to the corresponding drill bit bodies (400).

8. The multi-hole micro-fracture planetary drill bit according to claim 6 or 7, characterized in that: Part of the outer tube (100) is provided as an angle-adjustable deformed tube body; the position of the first serpentine hose (220) or the second serpentine hose (340) corresponds to the position of the deformed tube body.

9. The multi-hole micro-fracture planetary drill bit according to claim 1, characterized in that: The multi-hole micro-fracture planetary drill bit further comprises a carrier (500), the plurality of drill bit bodies (400) are mounted on the carrier (500), each drill bit body (400) is rotatably connected with the carrier (500), and each drill bit body (400) is relatively fixed with the carrier (500) in its own axial direction; the driving shaft (200) is rotatably matched with the carrier (500); the carrier (500) is slidably matched with the outer tube (100) in the extension direction of the outer tube (100), and the carrier (500) is relatively fixed with the outer tube (100) in the circumferential direction of the outer tube (100).

10. The multi-hole micro-fracture planetary drill bit according to claim 9, characterized in that: A plurality of guide strips (110) are arranged on the tube wall of the outer tube (100), and the plurality of guide strips (110) are arranged at intervals around the axis of the outer tube (100); the carrier (500) is located in the area surrounded by the plurality of guide strips (110) and is simultaneously matched with the plurality of guide strips (110) in a clamping manner, and the carrier (500) is slidably matched with the guide strips (110) in the extension direction of the guide strips (110).

Images