Square height adjustable fusion device

Abstract

The present invention discloses a square height-adjustable fusion device, comprising a main body, the main body comprising at least two base members arranged at intervals, a structural member being arranged between two adjacent base members, the two ends of the structural member being respectively connected to the two adjacent base members, and connecting members being arranged on the two adjacent base members, the main body having an extrusion deformation state, in which the distance between the two adjacent base members is reduced, the structural member protrudes outward to form a support surface, and the connecting members on the two adjacent base members are connected. In the above-mentioned square height-adjustable fusion device, when the main body is in the extrusion deformation state, the structural member is extruded, so that the structural member protrudes outward to support the vertebral body, the connecting members on the two adjacent base members are connected, so that the distance between the adjacent base members is fixed, thereby maintaining a certain height of the protruding portion of the structural member, the protruding portion of the structural member is not easily deformed, and the supporting effect on the vertebral body is relatively stable.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a square height-adjustable fusion device. Background Art

[0002] With the aging of the population, spinal degenerative diseases with neck and shoulder pain and waist and leg pain as the main symptoms are seriously affecting people's work and life. Intervertebral fusion is one of the main methods for treating spinal degenerative diseases.

[0003] Because each patient's spine and damaged spine are different, before surgery, the doctor needs to use multiple square height adjustable fusion devices of different heights for testing until the most suitable square height adjustable fusion device is found for surgery. At the same time, the square height adjustable fusion device needs to ensure stable support for the vertebral body after surgery, but the traditional square height adjustable fusion device has poor stability. Summary of the invention

[0004] Based on this, the present invention aims to overcome the defects of the prior art and provide a square height-adjustable fusion device with good stability.

[0005] The technical solution is as follows:

[0006] A square height-adjustable fusion device comprises a main body, wherein the main body comprises at least two base members arranged at intervals, a structural member is arranged between two adjacent base members, two ends of the structural member are respectively connected to the two adjacent base members, and two adjacent base members are each provided with a connecting member. The main body has an extrusion deformation state. In the extrusion deformation state, the distance between the two adjacent base members is reduced, the structural member protrudes outward to form a supporting surface, and the connecting members on the two adjacent base members are connected.

[0007] For the above-mentioned square height-adjustable fusion device, when the main body is in an extruded and deformed state, the distance between two adjacent base members is reduced, and the structural member is squeezed, causing the structural member to bulge outward to support the vertebral body. At this time, the connecting members on the two adjacent base members are connected to fix the distance between the two adjacent base members, thereby maintaining a certain height of the outward-bulging portion of the structural member. At this time, the outward-bulging portion of the structural member is not easy to deform, and the supporting effect on the vertebral body is relatively stable.

[0008] In one embodiment, the connecting members on two adjacent base members are respectively a first connecting member and a second connecting member, the first connecting member is provided with at least two first adjustment parts in sequence along the arrangement direction of the base members, and the second connecting member is provided with a second adjustment part which is clamped with the first adjustment part.

[0009] In one embodiment, the first adjustment portion is a first slot provided on the first connecting member, and the second adjustment portion is a first tooth matching the first slot.

[0010] In one embodiment, the first connecting member is provided with a plurality of second latching teeth, the first latching groove is formed between two adjacent second latching teeth, the number of the first latching teeth is at least two, and a second latching groove matching the second latching teeth is formed between two adjacent first latching teeth.

[0011] In one embodiment, the first latch tooth includes a tooth surface and a back surface, the tooth surface is arranged on a side of the back surface close to the first connecting member, the tooth surface is inclined in a direction away from the first connecting member, and the back surface is perpendicular to a horizontal plane.

[0012] In one embodiment, the support surface is a planar structure.

[0013] In one embodiment, the structural member includes a first connecting part, a supporting part and a second connecting part connected in sequence, the connection between the first connecting part and the supporting part can be bent, the connection between the second connecting part and the supporting part can be bent, and the outer side surface of the supporting part is the supporting surface.

[0014] In one embodiment, the first connecting portion includes two first plates arranged at intervals, and two ends of the first plates are respectively connected to the base member and the supporting portion; the second connecting portion includes two second plates arranged at intervals, and two ends of the second plates are respectively connected to the base member and the supporting portion.

[0015] In one embodiment, there are two structural members between two adjacent base members, and the two structural members are respectively a first structural member and a second structural member. The first structural member and the second structural member are spaced apart in the up and down directions, and the support portion of the first structural member and the support portion of the second structural member both protrude in relatively distant directions.

[0016] In one of the embodiments, the square height-adjustable fusion device further comprises a guide block, the base member is provided with an opening, the guide block slides through the opening and is connected to one of the base members. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of the square height-adjustable fusion device according to an embodiment of the present invention in a state of being squeezed and deformed;

[0018] Figure 2 It is a side view of the square height-adjustable fusion device according to an embodiment of the present invention in a state of being squeezed and deformed;

[0019] Figure 3 A top view of the square height-adjustable fusion device according to an embodiment of the present invention in a state of being squeezed and deformed;

[0020] Figure 4 It is a side view of the square height-adjustable fusion device in an undeformed state according to an embodiment of the present invention;

[0021] Figure 5 for Figure 2 A partial enlarged view of the middle A;

[0022] Figure 6 A three-dimensional diagram of a square height-adjustable fusion device according to another embodiment of the present invention in a state of being squeezed and deformed;

[0023] Figure 7 It is a schematic diagram of assembling the square height-adjustable fusion device according to an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 100. Base member, 101. First base member, 102. Second base member, 200. Structural member, 201. Support surface, 202. First structural member, 203. Second structural member, 210. First connecting portion, 211. First plate member, 220. Support portion, 221. First extension portion, 222. Second extension portion, 230. Second connecting portion, 231. Second plate member, 300. First connecting member, 310. First slot, 320. Second tooth, 400. Second connecting member, 410. First tooth, 411. Tooth surface, 412. Back surface, 420. Second slot, 500. Guide block. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] The “first” and “second” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0030] In this specific embodiment, the square height adjustable fusion cage is mainly placed between two vertebrae of the spine for support, but the square height adjustable fusion cage can also be used in other scenarios.

[0031] like Figures 1 to 4 As shown, an embodiment discloses a square height-adjustable fusion device, including a main body, the main body includes at least two base members 100 arranged at intervals, a structural member 200 is provided between two adjacent base members 100, two ends of the structural member 200 are respectively connected to the two adjacent base members 100, and two adjacent base members 100 are provided with connecting members. The main body has an extrusion deformation state. In the extrusion deformation state, the distance between the two adjacent base members 100 is reduced, the structural member 200 protrudes outward to form a support surface 201, and the connecting members on the two adjacent base members 100 are connected.

[0032] For the above-mentioned square height-adjustable fusion device, when the main body is in an extruded and deformed state, the distance between two adjacent base members 100 is reduced, and the structural member 200 is squeezed, causing the structural member 200 to bulge outward to support the vertebral body. At this time, the connecting members on the two adjacent base members 100 are connected to fix the distance between the two adjacent base members 100, thereby maintaining a certain height of the outward-bulging portion of the structural member 200. At this time, the outward-bulging portion of the structural member 200 is not easy to deform, and the supporting effect on the vertebral body is relatively stable.

[0033] Optionally, the main body also has an undeformed state, in which the connecting members on two adjacent base members 100 are spaced apart. Only when the main body enters the extrusion deformation state, the distance between the connecting members on the two adjacent base members 100 decreases until they are connected to each other, and the distance between the two adjacent base members 100 is fixed to ensure the support effect on the vertebral body.

[0034] In one embodiment, the connecting members on two adjacent base members 100 are respectively a first connecting member 300 and a second connecting member 400, and at least two first adjusting parts are sequentially provided on the first connecting member 300 along the arrangement direction of the base members 100, and a second adjusting part engaged with the first adjusting part is provided on the second connecting member 400. The closer the two adjacent base members 100 are, the higher the height of the protrusion of the structural member 200 is. Since at least two first adjusting parts are sequentially provided on the first connecting member 300 along the arrangement direction of the base members 100, the second adjusting part can be engaged with different first adjusting parts according to actual conditions, so that the two adjacent base members 100 are kept at a certain distance, thereby limiting the height of the protrusion of the structural member 200. Compared with the traditional method of using multiple square height adjustable fusion devices with different heights for testing in surgery, the above-mentioned square height adjustable fusion device can adjust the height of the protrusion of the structural member 200 according to actual conditions, which is convenient to operate, reduces the time for replacement and reinstallation, and thus reduces the surgery time and cost.

[0035] In addition, when the square height-adjustable fusion device is adjusted, the protruding portion of the structural member 200 is subjected to the pressure of the vertebral body, which may cause the two ends of the structural member 200 to push apart the base member 100, thereby reducing the protruding height of the structural member 200. However, since the first adjustment portion and the second adjustment portion are clamped together, the distance between two adjacent base members 100 can be prevented from increasing, thereby ensuring that the structural member 200 remains in a protruding state, thereby achieving a supporting effect on the vertebral body.

[0036] Optionally, the structural member 200 may be made of materials that meet the standards of implantable medical devices, such as SUS304, PEEK, titanium alloy or trabecular metal, and the surface treatment method may be polishing, frosting, plasma spraying, spraying nano-coating, etc.

[0037] Optionally, the first adjusting member and the second adjusting member are provided on both sides of the structural member 200. In this case, when the vertebral body is squeezed, the forces on both sides of the structural member 200 are evenly distributed, so that the vertebral body can be supported more stably.

[0038] In other embodiments, the connecting member may also be a magnet. In this case, the connecting members on two adjacent base members 100 can be attracted to each other, and the distance between the two adjacent base members 100 is kept stable by magnetic force.

[0039] In other embodiments, the connecting member may also be a hook. In this case, the connecting members on two adjacent base members 100 may be hooked to each other to prevent the distance between the two base members 100 from becoming larger, thereby preventing the protruding portion on the structural member 200 from deforming under the pressure of the vertebral body, thereby achieving stable support for the vertebral body.

[0040] In one embodiment, if Figure 1 and Figure 5As shown, the first adjustment part is a first slot 310 provided on the first connecting member 300, and the second adjustment part is a first latching tooth 410 matching the first slot 310. The first latching tooth 410 is inserted into the first slot 310 to achieve a snap fit, and the distance between two adjacent base members 100 can be adjusted by placing the first latching tooth 410 into different slots, thereby adjusting the height of the supporting portion 220.

[0041] Specifically, in the direction of the protrusion of the support portion 220, the first connecting member 300 and the second connecting member 400 are arranged alternately, the first connecting member 300 is provided with the first clamping groove 310 on the side close to the second connecting member 400, and the second connecting member 400 is provided with the first clamping tooth 410 on the side close to the first connecting member 300. At this time, the clamping of the first connecting member 300 and the second connecting member 400 will not affect the operation of other parts.

[0042] In other embodiments, the first adjustment portion may also be an opening on the first connecting member 300, and the second adjustment portion may be a clamping column provided on the second connecting member 400 and matching the opening. In this case, when the height adjustment of the support portion 220 is completed, the clamping column only needs to be inserted into the corresponding opening to achieve the support of the vertebral body by the support portion 220.

[0043] In one embodiment, if Figure 1 and Figure 5 As shown, a plurality of second latch teeth 320 are provided on the first connecting member 300, a first latch groove 310 is formed between two adjacent second latch teeth 320, the number of first latch teeth 410 is at least two, and a second latch groove 420 matching the second latch teeth 320 is formed between two adjacent first latch teeth 410. At this time, the first latch teeth 410 and the second latch teeth 320 are mutually engaged, the engagement effect is more stable, and the limiting effect of the distance between the two adjacent base members 100 is better. At the same time, since the second latch groove 420 is formed between the two adjacent first latch teeth 410, and the first latch groove 310 is formed between the two adjacent second latch teeth 320, the adjustment interval of the distance between the two adjacent base members 100 is smaller, and the height of the support portion 220 can be adjusted more accurately, so that the contact between the support portion 220 and the vertebral body is closer, and the supporting effect is better.

[0044] In one embodiment, if Figure 5As shown, the first latching tooth 410 includes a tooth surface 411 and a back surface 412. The tooth surface 411 is arranged on the side of the back surface 412 close to the first connecting member 300. The tooth surface 411 is inclined in the direction away from the first connecting member 300, and the back surface 412 is arranged perpendicular to the horizontal plane. In the above structure, since the first latching tooth 410 matches the first slot 310, the slot wall corresponding to the back surface 412 on the first slot 310 is also arranged perpendicular to the horizontal plane. When the support part 220 is subjected to the pressure of the vertebral body, it will cause the two adjacent base members 100 to have a tendency to move away from each other. At this time, since the back surface 412 is arranged perpendicular to the horizontal plane, the back surface 412 will be against the slot wall of the first slot 310, and the first latching tooth 410 will not slip out of the first slot 310, ensuring the stable connection between the first adjustment member and the second certificate.

[0045] In one embodiment, if Figure 1 and Figure 2 As shown, the support surface 201 is a planar structure. When the support surface 201 contacts the vertebral body, since the support surface 201 is a planar structure, it fits more closely with the vertebral body, the support surface 201 area of ​​the vertebral body is larger, the support is more stable, and the support effect is better.

[0046] In one embodiment, if Figures 1 to 3 As shown, the structural member 200 includes a first connecting portion 210, a supporting portion 220 and a second connecting portion 230 which are connected in sequence. The connection between the first connecting portion 210 and the supporting portion 220 can be bent, and the connection between the second connecting portion 230 and the supporting portion 220 can be bent. The outer side surface of the supporting portion 220 is a supporting surface 201. When the structural member 200 is squeezed, bending occurs between the first connecting portion 210 and the supporting portion 220, and between the second connecting portion 230 and the supporting portion 220, which can prevent the supporting portion 220 from bending when the structural member 200 is squeezed. Therefore, the above arrangement can keep the supporting portion 220 in a planar structure, ensuring a better supporting effect on the vertebral body.

[0047] Optionally, in the arrangement direction of the adjusting member, the length of the first connecting portion 210 is equal to the length of the second connecting portion 230. When the structural member 200 is squeezed, the supporting portion 220 can contact the vertebral body in a horizontal posture, increasing the contact area between the supporting surface 201 and the vertebral body and improving the stability of the vertebral body support.

[0048] Optionally, the first connection part 210 and the second connection part 230 are made of the same material, which ensures that when the structural member 200 is squeezed, the deformation of both sides of the support part 220 is consistent, so that the support part 220 can finally contact the vertebral body in a horizontal posture, increase the contact area between the support part 220 and the vertebral body, and improve the support effect on the vertebral body.

[0049] In other embodiments, if the supporting portion 220 needs to contact the vertebral body in a tilted posture relative to the horizontal plane according to the specific conditions of two adjacent vertebral bodies, the lengths of the first connecting portion 210 and the second connecting portion 230 may also be set to be different.

[0050] Optionally, when the number of the adjustment parts 100 is at least three, two adjacent base members 100 form a group of units, and after the structural members 200 in different groups of units are squeezed, the raised support planes 201 thereof may be parallel to each other or non-parallel to each other. The raised support planes 201 in different groups of units may be adjusted according to actual conditions to improve the support effect.

[0051] In one embodiment, if Figures 1 to 3 As shown, the first connection part 210 includes two first plates 211 arranged at intervals, and the two ends of the first plates 211 are respectively connected to the base member 100 and the support member 220, and the second connection part 230 includes two second plates 231 arranged at intervals, and the two ends of the second plates 231 are respectively connected to the base member 100 and the support member 220. At this time, the shapes of the first connection part 210, the second connection part 230 and the support member 220 are different. When the structural member 200 is squeezed, the connection between the first connection part 210 and the support member 220, and the connection between the second connection part 230 and the support member 220 are more likely to deform, ensuring that the support member 220 can bulge outward and the support member 220 does not bend and deform, thereby ensuring that the support member 220 has a better supporting effect on the vertebral body. At the same time, the weight of the square height adjustable fusion device can be reduced, making it more convenient to use.

[0052] In another embodiment, Figure 6 As shown, the first extension part 221 and the second extension part 222 are respectively provided on both sides of the support part 220, the first extension part 221 extends between the two first plates 211 and is spaced apart from the first plates 211, the second extension part 222 extends between the two second plates 231 and is spaced apart from the second plates 231, and the first extension part 221 and the second extension part 222 are arranged flush with the support part 220. In the above structure, the first extension part 221 and the second extension part 222 expand the area of ​​the support part 220, and the support of the vertebral body is more stable and the support effect is better.

[0053] In one embodiment, if Figure 1 and Figure 2As shown, there are two structural members 200 between two adjacent base members 100, and the two structural members 200 are respectively a first structural member 202 and a second structural member 203. The first structural member 202 and the second structural member 203 are spaced apart in the up-down direction, and the supporting portion 220 of the first structural member 202 and the supporting portion 220 of the second structural member 203 are both protruded in a relatively distant direction. When the two adjacent base members 100 are close to each other, the first structural member 202 and the second structural member 203 are both squeezed, and the supporting portion 220 of the first structural member 202 and the supporting portion 220 of the second structural member 203 are protruded in a relatively distant direction. At this time, the deformation of the square height adjustable fusion cage is larger, the contact with the two adjacent vertebrae is tighter, and the supporting effect is better.

[0054] Optionally, the connection between the first connection part 210 and the support part 220 and the connection between the second connection part 230 and the support part 220 are both provided with cutouts, and the cutout on the first structural member 202 is provided on the side of the first structural member 202 close to the second structural member 203, and the cutout on the second structural member 203 is provided on the side of the second structural member 203 close to the first structural member 202. When a cutout is provided on one side of the structural member 200, the strengths of the two sides of the structural member 200 are different, so that the structural member 200 bends toward the side with the cutout when being squeezed, and the above-mentioned arrangement of the cutouts on the first structural member 202 and the second structural member 203 can ensure that when two adjacent base members 100 approach each other, the support part 220 of the first structural member 202 and the support part 220 of the second structural member 203 move in a relatively distant direction to achieve support for two adjacent vertebral bodies.

[0055] In other embodiments, the connection between the first connection part 210 and the support part 220 and the connection between the second connection part 230 and the support part 220 may also be provided with a fold, which is a depression provided on the structural member 200, so that the structural member 200 can be bent along the fold when being squeezed.

[0056] Alternatively, if Figure 1 and Figure 2 As shown, two adjacent base members 100 are respectively a first base member 101 and a second base member 102. A first height limiting portion is provided on a side of the first base member 101 close to the second base member 102, and a second height limiting portion is provided on a side of the second base member 102 close to the first base member 101. The first height limiting portion and the second height limiting portion are arranged opposite to each other. By setting the first height limiting portion and the second height limiting portion, after the first base member 101 and the second base member 102 are close to each other at one end distance, the first height limiting portion and the second height limiting portion will abut against each other, resulting in the first base member 101 and the second base member 102 being unable to move closer, and the support portion 220 being unable to continue to bulge. Therefore, the above structure can limit the displacement of the support portion 220 to prevent the support portion 220 from exerting excessive pressure on the vertebral body.

[0057] Optionally, in the direction from the first base member 101 to the second base member 102, the sum of the length of the first height limiting portion and the length of the second height limiting portion is greater than or equal to the length of the support portion 220. After the structural member 200 is bent, the distance between the support portion 220 and the base member 100 will gradually increase during the process of reducing the bending angle from 180° to 90°, so that the height of the support portion 220 can be controlled, and when the bending angle is 90°, the distance between the support portion 220 and the base member 100 is the largest, and when the bending angle continues to decrease from 90°, the distance between the support portion 220 and the base member 100 will gradually decrease. If the control is not accurate, the support force of the support portion 220 on the vertebral body will be reduced. Therefore, the sum of the length of the first height limiting portion and the length of the second height limiting portion is set to be greater than or equal to the length of the support portion 220, so that the bending angle range of the structural member 200 after bending is 90° to 180°, which is convenient for controlling the support of the support portion 220 on the vertebral body.

[0058] Alternatively, if Figure 4 As shown, in the undeformed state, the main body is a hollow rectangular parallelepiped structure. When the main body is placed between the two vertebrae, the main body can be placed in a relatively stable manner without rotation, ensuring that when the structural member 200 is raised, the support surface 201 can better support the vertebrae and increase the contact area with the vertebrae. In addition, the hollow rectangular parallelepiped structure of the main body is conducive to the insertion and fixation of tools, and it is convenient to adjust the distance between the two base members 100.

[0059] Specifically, the support surface 201 is a partial side surface of the main body. At this time, as long as the distance between two adjacent base members 100 becomes smaller, the support surface 201 can protrude to form support for the vertebral body, and because the square height adjustable fusion device is a rectangular parallelepiped as a whole, when the square height adjustable fusion device is extended between two adjacent vertebral bodies, the square height adjustable fusion device will not rotate circumferentially, ensuring that the support surface 201 can support the vertebral body when it protrudes.

[0060] In other embodiments, in the undeformed state, the main body may also be a cylindrical structure, etc.

[0061] In one embodiment, if Figure 1 and Figure 7As shown, the square height adjustable fusion device further includes a guide block 500, and an opening is provided on the base member 100, and the guide block 500 slides through the opening and is connected to one of the base members 100. At this time, the guide block 500 can be used to sequentially pass through the openings of different base members 100. When the square height adjustable fusion device is extruded, the guide block 500 has a guiding function, and the base member 100 can move along the length direction of the guide block 500, so that the spacing between two adjacent base members 100 is reduced. Optionally, one of the base members 100 is abutted against the first end of the guide block 500, and the second end of the guide block 500 passes through the opening of the base member 100, and a threaded hole is provided on the end surface of the second end of the guide block 500 for threaded connection with an adjusting rod to fix the guide block 500. At this time, the base member 100 is pushed to move along the guide block 500, so that the two adjacent base members 100 are close to each other, thereby bending and protruding the structural member 200.

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A square height-adjustable fusion device, characterized in that: The main body comprises at least two base members arranged at intervals, a structural member is arranged between two adjacent base members, two ends of the structural member are respectively connected to the two adjacent base members, and connecting members are arranged on the two adjacent base members, the main body has an extrusion deformation state, in which the distance between the two adjacent base members is reduced, the structural member protrudes outward to form a supporting surface, and the connecting members on the two adjacent base members are connected; The main body also has an undeformed state, in which the connecting members on two adjacent base members are spaced apart, and when the main body enters an extruded deformation state, the distance between the connecting members on the two adjacent base members decreases until they are connected to each other; The connecting members on the two adjacent base members are respectively a first connecting member and a second connecting member, the first connecting member is provided with at least two first adjustment parts in sequence along the arrangement direction of the base members, and the second connecting member is provided with a second adjustment part which is engaged with the first adjustment part, so as to keep a distance between the two adjacent base members and limit the height of the protrusion of the structural member.

2. The square height-adjustable fusion device according to claim 1, characterized in that: The first adjusting portion is a first clamping groove provided on the first connecting member, and the second adjusting portion is a first clamping tooth matching the first clamping groove.

3. The square height-adjustable fusion device according to claim 2, characterized in that: The first connecting member is provided with a plurality of second latching teeth, the first latching groove is formed between two adjacent second latching teeth, the number of the first latching teeth is at least two, and a second latching groove matching the second latching teeth is formed between two adjacent first latching teeth.

4. The square height-adjustable fusion device according to claim 2, characterized in that: The first latching tooth includes a tooth surface and a back surface, wherein the tooth surface is arranged on a side of the back surface close to the first connecting member, the tooth surface is inclined in a direction away from the first connecting member, and the back surface is perpendicular to a horizontal plane.

5. The square height-adjustable fusion cage according to any one of claims 1 to 4, characterized in that: The supporting surface is a planar structure.

6. The square height-adjustable fusion device according to claim 5, characterized in that: The structural member includes a first connecting portion, a supporting portion and a second connecting portion which are connected in sequence. The connection between the first connecting portion and the supporting portion is bendable, the connection between the second connecting portion and the supporting portion is bendable, and the outer side surface of the supporting portion is the supporting surface.

7. The square height-adjustable fusion device according to claim 6, characterized in that: The first connection part includes two first plates arranged at intervals, and two ends of the first plates are respectively connected to the base member and the support part. The second connection part includes two second plates arranged at intervals, and two ends of the second plates are respectively connected to the base member and the support part.

8. The square height-adjustable fusion cage according to claim 6, characterized in that: There are two structural members between two adjacent base members, and the two structural members are respectively a first structural member and a second structural member. The first structural member and the second structural member are spaced apart in the up and down directions, and the supporting parts of the first structural member and the supporting parts of the second structural member both protrude in relatively distant directions.

9. The square height-adjustable fusion cage according to any one of claims 1 to 4, characterized in that: It also includes a guide block. The base member is provided with an opening. The guide block slides through the opening and is connected to one of the base members.

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