Large area support liftable cage

Abstract

The present application relates to a kind of large-area support can be elevated fusioner, including fusioner group, the fusion group includes multiple fusioner unit blocks, multiple the fusioner unit block is arranged linearly in horizontal plane, and the side end of adjacent two block the fusioner unit block is hinged to each other, the fusioner group can be adjusted to straight strip shape under the action of external force, or it is adjusted to curve shape, or it is adjusted to ring, and the fusioner unit block of two ends is fixed to each other, the upper end of each the fusioner unit block is vertically provided with lifting accommodating cavity, lifting assembly is respectively equipped in the lifting accommodating cavity, lifting drive device is arranged in the lifting accommodating cavity, the lifting drive device is connected with the lifting assembly, for driving the lifting assembly to stretch out or retract into the lifting accommodating cavity upwards.The advantage: design is reasonable, the fusioner can be bent to form large-area support, also can realize elevation, realize minimally invasive, high support.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a large-area support and elevable fusion device. Background Technology

[0002] Lower back pain is very common, affecting 85% of the population at some point in their lives. In industrialized countries, at least 30% of the population experiences lower back pain and sciatica at some point in their lives, with approximately 85% of these cases being lower back pain (LDH).

[0003] Spinal fusion has been used clinically for decades as a treatment for low back pain. Early concepts of fusion involved extensive muscle stripping, ample autologous bone grafting, and prolonged absolute bed rest. The introduction of interbody fusion significantly improved the treatment outcomes of spinal fusion. Interbody fusion internal fixation products have increased the success rate of fusion and reduced patient recovery time.

[0004] Currently, there are many devices available for spinal fusion, but all of them have varying degrees of shortcomings, specifically:

[0005] The device in patent CN201721366720 has a fixed volume. Under the premise of restoring the intervertebral height, the height of the fusion device is relatively high, and the opening passage required for implanting the fusion device is correspondingly larger. The surgery causes greater trauma to the patient and slows down the recovery. In this invention, the volume of the fusion device is variable. The foldable fusion device is implanted through the smallest gap, percutaneously, with less tissue damage and faster postoperative recovery.

[0006] For example, the device in patent CN201621033346 is a fusion device that can be raised and lowered, allowing for implantation with minimal trauma. However, this implant is a single unit and cannot provide support over a large area, lacking stability. Postoperative complications such as implant sinking and displacement, posterior dislodgement, and pseudoarthrosis are prone to occur.

[0007] The biggest problem with the two patented technologies mentioned above is that they cannot simultaneously satisfy the requirements of minimally invasive implantation and large-area support, which are also the two major problems faced by lumbar fusion surgery. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a large-area support and liftable fusion device, which effectively overcomes the defects of the prior art.

[0009] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0010] A large-area support liftable fusion device includes a fusion device assembly, which comprises multiple fusion device unit blocks arranged linearly in a horizontal plane. The sides of adjacent fusion device unit blocks are hinged to each other. The fusion device assembly can be adjusted to a straight shape, a curved shape, or a ring shape under the action of external force, and the fusion device unit blocks at both ends are fixed to each other. Each fusion device unit block has a vertically provided lifting and receiving cavity at its upper end. Lifting components are respectively assembled in the lifting and receiving cavities. Lifting drive devices are provided in the lifting and receiving cavities. The lifting drive devices are connected to the lifting components and are used to drive the lifting components to extend upward or retract downward into the lifting and receiving cavities.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the aforementioned fusion unit block comprises at least five blocks.

[0013] Furthermore, in two adjacent fusion unit blocks, one of the fusion unit blocks has coaxial first pin hole seats at both ends of its side end, and the other fusion unit block has a second pin hole seat in the middle of its side end. Additionally, the other fusion unit block has recessed areas at both ends of its side end that are adapted to the first pin hole seats. The first pin hole seats are embedded in the corresponding recessed areas, and the two first pin hole seats and the adjacent second pin hole seats are coaxial and connected by a pin passing through them, thereby achieving the hinge connection between the two adjacent fusion unit blocks.

[0014] Furthermore, in the aforementioned fusion unit blocks located at both ends, one of the aforementioned fusion unit blocks has a positioning plug on its side end, and the other of the aforementioned fusion unit blocks has a positioning groove on its side end that is adapted to the positioning plug. The positioning plug is used to insert into the positioning groove and is fixed to each other by fasteners.

[0015] Furthermore, the side end of another of the aforementioned fusion unit blocks located at both ends is also provided with a locking screw hole that communicates with the aforementioned positioning groove. A set bolt for locking and engaging with the aforementioned positioning plug is detachably installed in the aforementioned locking screw hole.

[0016] Furthermore, the aforementioned lifting assembly includes a first lifting top block and a lifting screw. The lifting screw is vertically and rotatably mounted in the aforementioned lifting receiving cavity. The first lifting top block has a threaded hole extending vertically through it and is screwed onto the outside of the aforementioned lifting screw. The first lifting top block is slidably connected vertically to the aforementioned lifting receiving cavity. A rotating gear is coaxially provided at the lower end of the aforementioned lifting screw corresponding to the portion below the aforementioned first lifting top block. Each of the aforementioned fusion unit blocks has a first lifting insertion hole extending through the aforementioned lifting receiving cavity at the portion corresponding to the aforementioned rotating gear. The aforementioned first lifting insertion holes are linearly distributed. The aforementioned lifting driving device is a flexible rack that linearly extends through all the aforementioned first lifting insertion holes. The tooth surfaces of the rack respectively mesh with the rotating gear of each of the aforementioned lifting screws.

[0017] Furthermore, the lifting assembly includes a second lifting top block and a guide rod. The guide rod is vertically mounted in the lifting receiving cavity. The second lifting top block has a guide hole that penetrates it vertically and is sleeved on the outside of the guide rod. The second lifting top block is slidably connected to the lifting receiving cavity. Each of the multiple fusion unit blocks has a second lifting insertion hole that communicates with the lifting receiving cavity at the part corresponding to the lower part of the second lifting top block. The multiple second lifting insertion holes are linearly distributed. The lifting driving device is a flexible strip component with an angled upper part at one end. One end of the strip component is inserted into the second lifting insertion hole of the fusion unit block where the positioning groove is located and linearly penetrates all the second lifting insertion holes. During this process, the angled part of the strip component passes sequentially through the lower end of each second lifting top block and presses the second lifting top block upward, causing the second lifting top block to extend upward out of the lifting receiving cavity.

[0018] The beneficial effects of this invention are: the structure is reasonably designed, the fusion device can be bent to form a large area of ​​support, and it can also be raised to achieve minimally invasive, high-height support. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the large-area support liftable fusion device of the present invention in a straight linear state;

[0020] Figure 2 This is a schematic diagram of the structure of the large-area support and lifting fusion device of the present invention during the bending process. Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the structure of the large-area support and lifting fusion device of the present invention during the bending process. Figure 2 ;

[0022] Figure 4 This is a schematic diagram of the structure of the large-area support and lifting fusion device of the present invention during the bending process. Figure 3 ;

[0023] Figure 5 This is a schematic diagram of the structure of the large-area support and liftable fusion device of the present invention after it is fully bent. Figure 3 ;

[0024] Figure 6 This is a schematic diagram of the structure of the large-area support liftable fusion unit of the present invention, showing the extension of the lifting component after complete bending.

[0025] Figure 7 This is a schematic diagram of a type of fusion unit block in the large-area support liftable fusion unit of the present invention;

[0026] Figure 8 for Figure 7 A sectional view of the middle structure;

[0027] Figure 9 This is a schematic diagram of the lifting assembly of the lifting screw in the large-area support lifting fusion device of the present invention;

[0028] Figure 10 This is a schematic diagram of another type of structure for the fusion unit block in the large-area support liftable fusion unit of the present invention;

[0029] Figure 11 Figure 10 A sectional view of the middle structure;

[0030] Figure 12 This is a schematic diagram of another embodiment of the large-area support for raising the fusion unit block in the fusion unit of the present invention;

[0031] Figure 13 for Figure 12 A cross-sectional view of the structure.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Fusion unit block; 4. Positioning plug; 5. Lifting assembly; 6. Lifting drive device; 11. First pin hole seat; 12. Second pin hole seat; 13. First lifting insertion hole; 14. Second lifting insertion hole; 41. Positioning groove; 51. First lifting top block; 52. Lifting screw; 53. Second lifting top block; 54. Guide rod; 411. Locking screw hole; 521. Rotary gear plate. Detailed Implementation

[0034] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] Example: Figures 1 to 6As shown, the large-area support liftable fusion device of this embodiment includes a fusion device group, which includes multiple fusion device unit blocks 1. The multiple fusion device unit blocks 1 are arranged linearly in a horizontal plane, and the side ends of two adjacent fusion device unit blocks 1 are hinged to each other. The fusion device group can swing and adjust to a straight shape, or swing and adjust to a curved shape, or swing and adjust to a ring shape under the action of external force, and fix the two ends of the fusion device unit blocks 1 to each other. Each fusion device unit block 1 has a vertically provided lifting and receiving cavity at its upper end. Lifting components 5 are respectively assembled in the lifting and receiving cavities. Lifting drive devices 6 are provided in the lifting and receiving cavities. The lifting drive devices 6 are connected to the lifting components 5 and are used to drive the lifting components 5 to extend upward or retract downward into the lifting and receiving cavities.

[0036] The usage process is as follows:

[0037] The fusion unit in this embodiment is initially in a straight shape, as shown below. Figure 1 During implantation, it will gradually bend with the bending force, as follows: Figure 2 , 3 As shown in Figure 4, the final state during the finalization process is as follows: Figure 5 Specifically, in its initial state, the lifting component 5 of the fusion unit is retracted within each unit, and the fusion unit is initially in a straight line. During implantation, under the action of bending force, it gradually bends into a straight shape until the entire fusion unit becomes annular, and the fusion unit blocks 1 at both ends are locked and fixed. Next, by operating the lifting drive device 6, the lifting component 5 is "lifted out" from the lifting receiving cavity, that is, raised to the raised state (e.g., Figure 6 As shown in the diagram, the fusion cage can be bent to form a ring during implantation, thus creating a large area of ​​support within the intervertebral space. Simultaneously, the lifting component 5 extends and retracts during operation to achieve lifting, resulting in a smaller cross-sectional area of ​​the fusion cage during implantation. This achieves minimally invasive implantation, adjustable fusion cage height, and the goal of restoring intervertebral height with high-height support. In summary, this embodiment solves the problems of large size and large surgical opening of traditional cage-type fusion cages, which cause surgical complications and long recovery periods for patients. It also solves the problems of implant sinking, posterior dislocation, and pseudoarthrosis formation caused by the small support area of ​​liftable fusion cages.

[0038] In this embodiment, the above-mentioned fusion unit block 1 is provided with at least five blocks, because at least five fusion unit blocks 1 can be smoothly bent to form a ring.

[0039] In a preferred embodiment, in two adjacent fusion unit blocks 1, one of the fusion unit blocks 1 has coaxial first pin hole seats 11 spaced apart at both ends of its side end (e.g., Figure 7 , 8As shown), another fusion unit block 1 has a second pin hole seat 12 located in the middle of its side end (as shown). Figure 10 , 11 As shown), and, at both ends of the side of another of the above-mentioned fusion unit blocks 1, a recessed area is formed that is adapted to the first pin hole seat 11. The first pin hole seat 11 is embedded in the corresponding recessed area, and the two first pin hole seats 11 and the adjacent second pin hole seat 12 are coaxial and connected by a pin passing through the three to realize the hinge of the two adjacent fusion unit blocks 1.

[0040] In the above implementation scheme, the two adjacent fusion unit blocks 1 are closely fitted together, and the components of the entire fusion unit are tightly fitted together after bending, resulting in a small space volume.

[0041] More specifically, the entire fusion unit is bent into a ring shape on its designated side. In the entire fusion unit, the fusion unit block 1 is roughly divided into three types. One type has a first pin hole seat 11 protruding from both sides. Another type has a second pin hole seat 12 protruding from the middle part of both sides. The remaining type is the fusion unit block 1 located at both ends. The fusion unit block 1 located at both ends only has a recessed area and a second pin hole seat 12 adapted to the first pin hole seat 11 on the connection side with the adjacent fusion unit block 1 (type 1). At the same time, the outer edge of each fusion unit block 1 in the entire fusion unit corresponding to its bent ring shape is designed as an arc shape, and its inner edge is designed as a plane. After the entire fusion unit is bent into a ring shape, the two sides of the inner edge of the two adjacent fusion unit blocks 1 fit together.

[0042] In a preferred embodiment, in the two fusion unit blocks 1 located at both ends, one of the fusion unit blocks 1 is provided with a positioning plug 4 on its side end, and the other fusion unit block 1 is provided with a positioning groove 41 adapted to the positioning plug 4 on its side end. The positioning plug 4 is used to insert into the positioning groove 41 and is fixed to each other by a fastener.

[0043] In the above implementation scheme, after the fusion unit is bent into a ring, the positioning plug 4 is inserted into the positioning groove 41 and then locked with the fixing component, so that the entire fusion unit forms a relatively strong ring component. The design of the positioning groove 41 and the positioning plug 4 makes it easy for the fusion unit to be bent into a ring, avoiding blind bending.

[0044] As a preferred embodiment, the side end of the other fusion unit block 1 located at both ends is also provided with a locking screw hole 411 that communicates with the positioning groove 41. The locking screw hole 411 is detachably fitted with a set bolt for locking and engaging with the positioning plug 4.

[0045] In the above implementation scheme, the locking screw hole 411 and the positioning plug 4 are in a perpendicular state. By tightening the locking bolt, the screw end of the locking bolt can be made to abut against the positioning plug 4, thereby making the positioning plug 4 firmly held in the positioning groove 41. The whole design is ingenious and simple and convenient to operate.

[0046] In this embodiment, the structure of the lifting component 5 includes at least the following three forms:

[0047] 1) such as Figure 7 , 8 As shown in Figures 9, 10, and 11, the lifting assembly 5 includes a first lifting top block 51 and a lifting screw 52. The lifting screw 52 is vertically and rotatably mounted in the lifting receiving cavity. The first lifting top block 51 has a threaded hole that passes through it vertically and is screwed onto the outside of the lifting screw 52. The first lifting top block 51 is slidably connected to the lifting receiving cavity vertically. A rotating gear disk 521 is coaxially provided at the lower end of the lifting screw 52 corresponding to the part below the first lifting top block 51. Each of the multiple fusion unit blocks 1 has a first lifting insertion hole 13 that passes through the lifting receiving cavity at the part corresponding to the rotating gear disk 521. The multiple first lifting insertion holes 13 are linearly distributed. The lifting drive device 6 is a flexible rack that linearly passes through all the first lifting insertion holes 13. The tooth surfaces of the rack mesh with the rotating gear disk 521 of each of the lifting screws 52.

[0048] In the above scheme 1), after the fusion device is bent into a ring, the rack (lifting drive device 6) is inserted, so that the tooth surface of the rack gradually engages with the rotating gear disk 521 at the lower end of all the lifting screws 52. As the rack is pulled or pushed, all the lifting screws 52 rotate synchronously and drive the first lifting top block 51 to move upward and extend out of the upper end of the lifting receiving cavity (that is, lifting). The entire design can achieve linkage using the rack, which is simple and convenient to operate.

[0049] It should be noted that: in this embodiment, linear arrangement refers to the distribution direction of multiple fusion unit blocks 1, which are distributed on a line. The extension direction of this line refers to the linear distribution direction or linear through direction mentioned in this embodiment.

[0050] It should also be noted that the upper space of the lifting and receiving cavity is adapted to the shape of the first lifting top block 51, and the lower space is adapted to the lifting screw 52 and the rotating gear 521. The lower space is smaller than the upper space, so that the first lifting top block 51 will not fall into the lower space.

[0051] 2) such as Figure 12 , 13As shown, the lifting assembly 5 includes a second lifting top block 53 and a guide rod 54. The guide rod 54 is vertically mounted in the lifting receiving cavity. The second lifting top block 53 has a guide hole that penetrates it vertically and is sleeved on the outside of the guide rod 54. The second lifting top block 53 is slidably connected to the lifting receiving cavity. In multiple fusion unit blocks 1, the portion corresponding to the lower part of the second lifting top block 53 is provided with a second lifting insertion hole 14 that communicates with the lifting receiving cavity. 14 are linearly distributed. The lifting drive device 6 is a flexible strip member with an oblique angle at the upper part of one end. One end of the strip member is inserted into the second lifting insertion hole 14 of the fusion unit block 1 where the positioning groove 41 is located, and linearly passes through all the second lifting insertion holes 14. During this process, the oblique angle of the strip member passes through the lower end of each second lifting top block 53 in sequence, and presses the second lifting top block 53 upward, so that the second lifting top block 53 extends upward out of the lifting receiving cavity.

[0052] In the above scheme 2), after the fusion device is bent into a ring, the strip component (lifting drive device 6) is inserted and pushed and pulled. Since the initial state is such that the distance between the lower end of the second lifting top block 53 and the bottom wall of the lifting receiving cavity is less than the width (height) dimension of the strip component and slightly greater than the width (height) of the beveled end (b) of one end of the strip component, after the strip component is inserted, it will squeeze the second lifting top block 53 upward, thereby driving the second lifting top block 53 to move upward and extend out of the upper end of the lifting receiving cavity (that is, lifting). The entire drive structure is reasonably designed, and linkage can be achieved by pulling the strip component.

[0053] 3) The lifting assembly 5 includes a third lifting top block and a lifting connecting rod (a screw). The lifting connecting rod is vertically and rotatably assembled in the lifting receiving cavity. The third lifting top block has a threaded hole that runs through it from top to bottom and is screwed onto the outside of the lifting connecting rod. The third lifting top block and the lifting receiving cavity are slidably connected vertically. A gear is coaxially provided at the lower end of the lifting connecting rod corresponding to the part below the third lifting top block. At the same time, a cavity that runs through both sides of the lifting receiving cavity is provided at the part corresponding to the gear. The gears in two adjacent fusion unit blocks 1 mesh with each other. A notch is opened at the side end of one of the fusion unit blocks 1 located at both ends. By using a tool to turn the gear through the notch, the gears in all fusion unit blocks 1 can be linked, thereby driving the lifting connecting rods in all fusion unit blocks 1 to rotate, and finally realizing the synchronous up and down movement of all the third lifting top blocks.

[0054] In the description of this invention, 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" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A large area support liftable cage, characterized by: The application relates to a fusion device group, which comprises a plurality of fusion unit blocks (1) arranged in a linear array in a horizontal plane, and the side ends of two adjacent fusion unit blocks (1) are hingedly connected to each other; the fusion device group can be adjusted to a straight strip shape, a curved shape or a ring shape under the action of external force, and the fusion unit blocks (1) at two ends are fixed to each other; the upper end of each fusion unit block (1) is vertically provided with a lifting accommodating cavity, the lifting accommodating cavity is provided with a lifting assembly (5), the lifting accommodating cavity is provided with a lifting driving device (6), the lifting driving device (6) is connected with the lifting assembly (5) and is used for driving the lifting assembly (5) to extend upwards or retract downwards into the lifting accommodating cavity; the fusion device group is provided with at least five fusion unit blocks (1); the side end of one of the fusion unit blocks (1) at two ends is provided with a positioning plug (4), and the side end of the other fusion unit block (1) is provided with a positioning groove (41) matched with the positioning plug (4); the positioning plug (4) is used for being inserted into the positioning groove (41) and being fixed to each other through a fixing member; the lifting assembly (5) comprises a first lifting top block (51) and a lifting screw rod (52); the lifting screw rod (52) is vertically and rotatably arranged in the lifting accommodating cavity; the first lifting top block (51) is provided with a threaded hole penetrating therethrough in the up-down direction, is rotatably sleeved on the lifting screw rod (52) and is in sliding connection with the lifting accommodating cavity in the up-down direction; the lower end of the lifting screw rod (52) is coaxially provided with a rotating gear plate (521) corresponding to the position below the first lifting top block (51); the positions corresponding to the rotating gear plate (521) in the plurality of fusion unit blocks (1) are provided with first lifting insertion holes (13) penetrating through the lifting accommodating cavity; the first lifting insertion holes (13) are linearly distributed; the lifting driving device (6) is a flexible rack which linearly penetrates through all the first lifting insertion holes (13); and the tooth surface of the rack is in engagement with the rotating gear plate (521) of each lifting screw rod (52).

2. A large area support liftable cage according to claim 1, characterized in that: The side end of one of the two adjacent fusion unit blocks (1) is provided with coaxial first pin shaft hole seats (11) at two ends; the side end of the other fusion unit block (1) is provided with a second pin shaft hole seat (12) at the middle part; the two ends of the side end of the other fusion unit block (1) form recessed areas matched with the first pin shaft hole seats (11); the first pin shaft hole seats (11) are embedded into the corresponding recessed areas; the two first pin shaft hole seats (11) and the adjacent second pin shaft hole seat (12) are coaxial and are connected through a pin shaft penetrating through the three, so as to realize the hinged connection of the two adjacent fusion unit blocks (1).

3. A large area support liftable cage according to claim 2, wherein: The side end of the other one of the fusion unit blocks (1) at the two ends is also provided with a locking screw hole (411) penetrating the positioning slot (41), and a locking bolt for locking with the positioning plug (4) is detachably assembled in the locking screw hole (411).

4. A large area support liftable cage characterized by: The fusion unit block (1) is provided with at least five pieces. The side end of one of the fusion unit blocks (1) at the two ends is provided with a positioning plug (4), and the side end of the other one of the fusion unit blocks (1) is provided with a positioning slot (41) matched with the positioning plug (4). The positioning plug (4) is used for being inserted into the positioning slot (41) and being fixed by a fixing member. The lifting assembly (5) comprises a second lifting top block (53) and a guide rod (54). The guide rod (54) is vertically assembled in the lifting accommodating cavity. The second lifting top block (53) is provided with a guide hole vertically penetrating the second lifting top block (53), is sleeved on the guide rod (54), and is in sliding connection with the lifting accommodating cavity. The positions corresponding to the lower part of the second lifting top block (53) in the plurality of fusion unit blocks (1) are provided with second lifting insertion holes (14) penetrating the lifting accommodating cavity. The second lifting insertion holes (14) are linearly distributed. The lifting driving device (6) is a flexible strip-shaped member. The upper part of one end of the strip-shaped member is provided with an inclined angle. One end of the strip-shaped member is inserted from the second lifting insertion hole (14) of the fusion unit block (1) where the positioning slot (41) is located and linearly penetrates all the second lifting insertion holes (14). In this process, the inclined angle of the strip-shaped member sequentially passes the lower end of each second lifting top block (53) and upwardly extrudes the second lifting top block (53), so that the second lifting top block (53) is upwardly extruded from the lifting accommodating cavity.

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