An in vivo adjustable fusion device

Abstract

The present invention discloses an in vivo adjustable fusion device, comprising: an upper plate body; a lower plate body; an adjustment component, wherein the adjustment component can control the expansion and closing between the upper plate body and the lower plate body. There are two adjustment components, and the two adjustments are respectively located on both sides of the upper plate body and the lower plate body, and each adjustment component is used to adjust the expansion and closing of the upper plate body and the lower plate body on the side of the adjustment component. After the fusion device is implanted into the human body, the height of the fusion device can be adjusted according to specific circumstances to match the specific size. If the size of one side is larger, then the adjustment component on that side is adjusted to expand the upper plate body and the lower plate body on that side. If the sizes on both sides are basically equal, then the two adjustment components are adjusted at the same time to expand the upper plate body and the lower plate body in parallel. The present application avoids the frequent entry of surgical instruments into the body, thereby avoiding excessive irritation and interference with the tissues in the body, and simplifies the OLIF surgical steps.

Description

Technical Field

[0001] The present invention relates to the field of intervertebral disc treatment instruments, and more particularly to an in vivo adjustable fusion device. Background Art

[0002] The intervertebral disc is a cartilage connection between two adjacent vertebrae, which is composed of an outer annulus fibrosus and a central nucleus pulposus. The intervertebral disc has a certain elasticity, and when the spine moves, the intervertebral disc produces a wedge-shaped deformation. When the spine bends forward, the front half of the intervertebral disc is flattened and thinned, while the back half thickens, and the nucleus pulposus moves backward; the opposite is true when the spine extends backward. When the spine flexes to the right, the right half of the intervertebral disc becomes thinner and the left half thickens, and the nucleus pulposus moves to the left; the opposite changes occur when the spine flexes to the left. Therefore, the intervertebral disc has the functions of increasing the range of spinal movement, bearing pressure, buffering shock, and protecting the brain and spinal cord. It is also the main reason for changes in height sooner or later.

[0003] Spinal diseases, especially disc herniation and prolapse, are particularly common in modern society. OLIF surgery (minimally invasive intervertebral disc fusion) has unique advantages in treating lumbar disc herniation, spinal canal stenosis, spinal nerve decompression, and achieving minimally invasive surgery. In order to cooperate with OLIF surgery, orthopedic surgeons need to use a fusion device to support two adjacent vertebrae to rebuild the vertebral height.

[0004] The size of the fusion cage commonly used in OLIF surgery is fixed. Therefore, the doctor must first determine what size fusion cage is needed between the vertebrae where the intervertebral disc has been removed. At this time, the doctor will use surgical instruments such as trial molds to measure and determine step by step. However, during this process, the surgical instruments frequently enter the patient's body, which may excessively irritate and interfere with tissues, nerves, muscles, etc. At the same time, the doctor needs to repeat the surgical action back and forth when measuring, which increases the complexity of treatment.

[0005] Therefore, how to avoid excessive stimulation and interference with body tissues during OLIF surgery while simplifying the OLIF surgical steps is a key issue that needs to be urgently solved by those skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to avoid excessive stimulation and interference of body tissues during OLIF surgery, while simplifying the OLIF surgery steps. To achieve the above purpose, the following technical solutions are provided:

[0007] An in vivo adjustable fusion device, comprising:

[0008] upper plate body;

[0009] lower plate body;

[0010] There are two adjustment components, and the two adjustment components are distributed on both sides of the upper plate body and the lower plate body. Each of the adjustment components can adjust the expansion and closing of the upper plate body and the lower plate body on the side of the adjustment component. The expansion and closing are formed by the upper plate body and the lower plate body flipping outward or inward with the other adjustment component as the fulcrum. The two adjustment components can also be adjusted simultaneously.

[0011] Preferably, the adjustment assembly includes an upper rail member and a lower rail member, the cross-sections of the outer surfaces of the upper rail member and the lower rail member are both arc-shaped, an upper arc-shaped groove adapted to the upper rail member is provided on the inner surface of the upper plate body, and a lower arc-shaped groove adapted to the lower rail member is provided on the inner surface of the lower plate body.

[0012] Preferably, an upper groove extending along the circumference of the upper rail member is provided on the outer surface of the upper rail member, and a lower groove extending along the circumference of the lower rail member is provided on the outer surface of the lower rail member;

[0013] An upper latch pin connected to the upper plate body is radially snapped into the upper latch groove, and a lower latch pin connected to the lower plate body is radially snapped into the lower latch groove.

[0014] Preferably, the inner surfaces of the upper track member and the lower track member are respectively provided with an upper track and a lower track, and the upper track and the lower track form a wedge-shaped space;

[0015] The adjustment assembly also includes a sliding block having an upper wedge surface and a lower wedge surface, wherein the upper wedge surface and the lower wedge surface cooperate with the upper track and the lower track respectively, and the sliding block can slide along the upper track and the lower track.

[0016] Preferably, along the sliding direction of the sliding block, there are two wedge-shaped spaces, and the small openings of the two wedge-shaped spaces are opposite to each other. There are two sliding blocks, and the two sliding blocks are respectively matched in the two wedge-shaped spaces.

[0017] Preferably, the adjustment assembly further comprises an adjustment rod, on which two sections of threads with opposite rotation directions are arranged, and each section of the threads is threadedly connected to one of the sliding blocks.

[0018] Preferably, two limit plates are arranged between the two sections of the thread, the two limit plates are arranged on both sides of the adjusting rod, and the two limit plates are fixedly connected to the upper track member or the lower track member.

[0019] Preferably, the side of the upper plate body is provided with an upper stop tooth protruding downward, and the upper stop tooth can abut against the lower plate body; the side of the lower plate body is provided with a lower stop tooth protruding upward, and the lower stop tooth can abut against the upper plate body.

[0020] Preferably, an upper stopper is provided on the inner surface of the upper plate body, the upper stopper is located between the two adjustment components, and the upper stopper and the upper stopper tooth form a space for constraining the upper track member;

[0021] A lower stopper is disposed on the inner surface of the lower plate body, and the lower stopper is located between the two adjustment assemblies. The lower stopper and the lower stopper tooth form a space for constraining the lower track member.

[0022] Preferably, the upper stoppers are multiple and arranged along the axial direction, an upper bone grafting hole is provided between two of the upper stoppers, and the upper bone grafting hole penetrates the upper plate body along the thickness direction of the upper plate body;

[0023] The lower stoppers are multiple and arranged along the axial direction. A lower bone grafting hole is provided between two of the lower stoppers. The lower bone grafting hole penetrates the lower plate body along the thickness direction of the lower plate body.

[0024] Preferably, the upper stop tooth and the lower stop tooth are arranged in a staggered manner, and a support block is arranged on the side of the lower stop tooth, and the support block can support the upper stop tooth.

[0025] Preferably, upper inverted teeth are provided on the outer surface of the upper plate body, and the upper inverted teeth are used to abut against the lower end plate of the upper vertebral body;

[0026] Lower inverted teeth are arranged on the outer surface of the lower plate body, and the lower inverted teeth are used for abutting against the upper end plate of the lower vertebral body.

[0027] It can be seen from the above technical scheme that after the fusion device in the present application is implanted in the human body, the height of the fusion device can be adjusted according to the specific situation to match the specific size. If the size on one side is larger, then adjust the adjustment component on that side so that the upper plate and the lower plate on that side expand. If the sizes on both sides are basically equal, then adjust the two adjustment components at the same time so that the upper plate and the lower plate expand in parallel. Compared with the prior art, the present application omits the step of measuring the size, thereby avoiding frequent implantation of surgical instruments into the body, thereby avoiding excessive irritation and interference with the body's tissues, and simplifying the OLIF surgical steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the scheme in the embodiment of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1A schematic diagram of the overall structure of an in vivo adjustable fusion device provided in a specific embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the structure of an adjustment rod provided in a specific embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the structure of an adjustment component provided in a specific embodiment of the present invention;

[0032] Figure 4 A schematic structural diagram of an upper track member provided in a specific embodiment of the present invention;

[0033] Figure 5 A schematic structural diagram of an upper track member provided in a specific embodiment of the present invention;

[0034] Figure 6 A schematic diagram of the structure of a lower plate body provided in a specific embodiment of the present invention;

[0035] Figure 7 A schematic structural diagram of an upper plate body provided in a specific embodiment of the present invention;

[0036] Figure 8 A schematic diagram of the structure of a sliding block provided in a specific embodiment of the present invention;

[0037] Fig. 9 A schematic diagram of the structure of an in-vivo adjustable fusion device when one side is expanded provided by a specific embodiment of the present invention;

[0038] Fig.10 A schematic diagram of the structure of an in vivo adjustable fusion device when one side is expanded provided by a specific embodiment of the present invention.

[0039] Among them, 1 is an upper plate body, 2 is a lower plate body, 3 is an upper track member, 4 is a lower track member, 5 is a sliding block, 6 is an adjusting rod, 7 is a stop block, 8 is an upper guide groove, 9 is an upper stop tooth, 10 is an upper latch pin, 11 is an upper track, 12 is an upper guide strip, 13 is a limit plate, 14 is an upper slot, 15 is a lower stop tooth, 16 is a support block, 17 is a lower stop block, 18 is a lower bone implant hole, 19 is an upper inverted tooth, 20 is an upper arc groove, and 21 is a lower arc groove. DETAILED DESCRIPTION

[0040] The invention discloses an in vivo adjustable fusion device, which can avoid excessive stimulation and interference of in vivo tissues during OLIF surgery and simplify the OLIF surgery steps.

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, the terms "upper" and "lower" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0043] The present invention discloses an in vivo adjustable fusion device, comprising: an upper plate body 1, a lower plate body 2 and an adjustment component. The adjustment component can control the expansion and closing between the upper plate body 1 and the lower plate body 2. "Expansion" means that the upper plate body 1 and the lower plate body 2 move away from each other, and "closing" means that the upper plate body 1 and the lower plate body 2 move closer to each other.

[0044] Furthermore, there are two adjustment components, which are distributed on both sides of the upper plate body 1 and the lower plate body 2, and each adjustment component is used to adjust the expansion and closing of the upper plate body 1 and the lower plate body 2 on the side of the adjustment component. That is, if one side of the upper plate body 1 and the lower plate body 2 is to be expanded, then the adjustment component on this side is adjusted. The expansion action of the upper plate body 1 and the lower plate body 2 on this side is that the upper plate body 1 and the lower plate body 2 are turned outward with the adjustment component on the other side as the fulcrum. The closing action of the upper plate body 1 and the lower plate body 2 on this side is that the upper plate body 1 and the lower plate body 2 are turned inward with the adjustment component on the other side as the fulcrum. Since the adjustment component on the other side acts as a fulcrum during the unilateral turning process of the upper plate body 1 and the lower plate body 2, the expansion angle when the upper body 1 and the lower body 2 are turned unilaterally can be large enough, up to 11°.

[0045] After the fusion device of the present invention is implanted in the human body, the height of the fusion device can be adjusted according to the specific situation to match the specific size. If the size on one side is larger, then adjust the adjustment component on that side so that the upper plate body 1 and the lower plate body 2 on that side expand. If the sizes on both sides are basically equal, then adjust the two adjustment components at the same time so that the upper plate body 1 and the lower plate body 2 expand in parallel. Compared with the prior art, the present application omits the step of measuring the size, thereby avoiding the surgical instruments from frequently entering the body, thereby avoiding excessive irritation and interference with the body's tissues, and simplifying the OLIF surgical steps.

[0046] Next, it is specifically described how the adjustment assembly acts as a fulcrum for the upper plate 1 and the lower plate 2: the adjustment assembly includes an upper track member 3 and a lower track member 4, the cross-sections of the outer surfaces of the upper track member 3 and the lower track member 4 are both arc-shaped, an upper arc-shaped groove 20 adapted to the upper track member 3 is provided on the inner surface of the upper plate 1, and a lower arc-shaped groove 21 adapted to the lower track member 4 is provided on the inner surface of the lower plate 2. If the adjustment assembly serves as a fulcrum, the upper arc-shaped groove 20 of the upper plate 1 rotates relative to the arc-shaped outer surface of the upper track member 3, and the lower arc-shaped groove 21 of the lower plate 2 rotates relative to the arc-shaped outer surface of the lower track member 4.

[0047] Furthermore, an upper retaining groove 14 extending along the circumferential direction of the upper track member 3 is provided on the outer surface of the upper track member 3, and a lower retaining groove extending along the circumferential direction of the lower track member 4 is provided on the outer surface of the lower track member 4. The upper retaining pin 10 connected to the upper plate body 1 is radially snapped into the upper retaining groove 14, and the lower retaining pin connected to the lower plate body 2 is radially snapped into the lower retaining groove. In this way, the upper track member 3 and the lower track member 4 cannot move axially. At this point, the upper track member 3 can only rotate circumferentially relative to the upper plate body 1, and the lower track member 4 can only rotate circumferentially relative to the lower plate body 2.

[0048] Next, the adjustment principle of the adjustment component is introduced in detail: the inner surfaces of the upper track member 3 and the lower track member 4 are respectively provided with an upper track 11 and a lower track, the track surface of the upper track 11 is wedge-shaped, and the track surface of the lower track is also wedge-shaped, so the upper track 11 and the lower track form a wedge-shaped space. The adjustment component also includes a sliding block 5, and the sliding block 5 has an upper wedge surface and a lower wedge surface. The upper wedge surface and the lower wedge surface of the sliding block 5 cooperate with the upper track 11 and the lower track respectively. In this way, if the sliding block 5 moves in the direction of shrinking the wedge-shaped space, the expansion of the upper plate body 1 and the lower plate body 2 can be achieved; if the sliding block 5 moves in the direction of expanding the wedge-shaped space, the contraction of the upper plate body 1 and the lower plate body 2 can be achieved.

[0049] Furthermore, along the sliding direction of the sliding block 5, two wedge-shaped spaces are set, and the small openings of the two wedge-shaped spaces are opposite to each other. There are two sliding blocks 5, and the two sliding blocks 5 are respectively matched in the two wedge-shaped spaces. The upper rails 11 of the upper rail member 3 are set to be two symmetrical, and the lower rails on the lower rail member 4 are set to be two symmetrical, so that two wedge-shaped spaces with small openings opposite to each other can be obtained. In this way, the upper plate body 1 and the lower plate body 2 can be expanded or closed smoothly in the length direction.

[0050] In order to prevent the sliding block 5 from being separated from the upper track member 3 or the lower track member 4, the following design is made in this embodiment: upper guide bars 12 bent inwardly are provided on both sides of the upper track 11, and upper guide grooves 8 cooperating with the upper guide bars 12 are provided on the side of the sliding block 5. Since the sliding block 5 moves axially and the upper track member 3 moves up and down, the upper track member 3 moves obliquely relative to the sliding block 5, and therefore, the upper guide grooves 8 are correspondingly provided as oblique grooves.

[0051] Similarly, lower guide strips bent inward are provided on both sides of the lower track, and lower guide grooves cooperating with the lower guide strips are provided on the side of the sliding block 5. Since the sliding block 5 moves axially and the lower track member 4 moves up and down, the lower track moves obliquely relative to the sliding block 5, and therefore, the lower guide groove is also provided as an oblique groove accordingly. The upper guide groove 8 and the lower guide groove form a wedge shape, as shown in the attached figure. Figure 8 shown.

[0052] It should be noted that the upper track 11 has two sides, so there are two upper guide bars 12, two upper guide grooves 8, and two upper guide grooves 8 are respectively arranged on two sides of the sliding block 5. The lower track has two sides, so there are two lower guide bars, two lower guide grooves, and two lower guide grooves are respectively arranged on two sides of the sliding block 5.

[0053] Next, how to drive the sliding block to move is described: the adjustment assembly also includes an adjustment rod 6, and the driving force of the sliding block 5 comes from the adjustment rod 6. The adjustment rod 6 is provided with two sections of threads, and the two sections of threads rotate in opposite directions. A sliding block 5 is threadedly matched on each section of threads. In this embodiment, when the adjustment rod 6 is rotated in one direction, the two sliding blocks 5 will approach each other, thereby realizing the expansion of the upper plate body 1 and the lower plate body 2; when the adjustment rod 6 is rotated in the other direction, the two sliding blocks 5 will move away from each other, thereby realizing the contraction of the upper plate body 1 and the lower plate body 2.

[0054] Furthermore, a stop block 7 is provided at the end of each thread segment, and the end is close to another thread segment. Then, the sliding block 5 on each thread segment cannot slide further when sliding to the stop block 7. In this way, the sliding block 5 is prevented from disengaging from the thread on the adjusting rod 6.

[0055] In addition, a limit plate 13 may be provided between the two stop blocks 7. There are two limit plates 13, which are provided on both sides of the adjustment rod 6, so as to limit the adjustment rod 6 and ensure that the relative relationship between the adjustment rod 6 and the upper track member 3 and the lower track member 4 remains unchanged. The limit plate 13 is connected to the upper track member 3 or the lower track member 4.

[0056] In addition, in order to facilitate the rotation of the adjusting rod 6, a rotating hole can also be provided at the end of the adjusting rod 6. Specifically, it can be a hexagonal hole. When the adjusting rod 6 needs to be rotated, a hexagonal wrench is inserted into the hexagonal hole, and then the hexagonal wrench is rotated.

[0057] Please refer to the attached Fig. 9 , 10 , an upper stop tooth 9 protruding downward is provided on the side of the upper plate body 1, and the upper stop tooth 9 can abut against the lower plate body 2. A lower stop tooth 15 protruding upward is provided on the side of the lower plate body 2, and the lower stop tooth 15 can abut against the upper plate body 1. In this way, when one side of the upper plate body 1 and the lower plate body 2 expand, the other side of the upper plate body 1 and the lower plate body 2 will close, then when the upper stop tooth 9 abuts against the lower plate body 2, and / or the lower stop tooth 15 abuts against the upper plate body 1, one side of the upper plate body 1 and the lower plate body 2 can no longer expand, and this is the maximum limit position of expansion.

[0058] Furthermore, the upper stop teeth 9 and the lower stop teeth 15 are staggered, and a support block 16 is provided on the side of the lower stop teeth 15. In the natural state, the upper stop teeth 9 on the upper plate body 1 sit on the support block 16 of the lower stop teeth 15, thereby supporting the upper plate body 1 and ensuring that a suitable distance is maintained between the upper plate body 1 and the lower plate body 2. When the upper plate body and the lower plate body are unilaterally expanded, the upper stop teeth on the upper plate body can stagger the support blocks on the lower plate body.

[0059] An upper stopper is arranged on the inner surface of the upper plate body 1, and the upper stopper is located between the two adjustment components, or in other words, the upper stopper and the upper stopper teeth 9 are arranged on both sides of the upper arc groove 20, and the upper stopper and the upper stopper teeth 9 form a space for constraining the upper track member.

[0060] A lower stop block 17 is provided on the inner surface of the lower plate body 2, and the lower stop block 17 is located between the two adjustment components, or in other words, the lower stop block 17 and the lower stop tooth 15 are respectively arranged on both sides of the lower arc groove 21, and the lower stop block 17 and the lower stop tooth 15 form a space for constraining the lower track member 4.

[0061] The upper rail member 3 is constrained by the upper block and the upper stop teeth 9, so the upper rail member 3 will not be separated from the upper plate 1, and even if the upper plate 1 rotates relative to the upper rail member 3, the upper body 1 and the upper rail member 3 can be smoothly reset. Similarly, the lower rail member 4 is constrained by the lower block 17 and the lower stop teeth 21, so the lower rail member 4 will not be separated from the lower plate 2, and even if the lower plate 2 rotates relative to the lower rail member 4, the lower plate 2 and the lower rail member 4 can be smoothly reset.

[0062] Further, the upper stopper is provided as a plurality of blocks arranged along the axial direction, and an upper bone graft hole is provided between the two upper stoppers, and the upper bone graft hole penetrates the upper plate body 1 along the thickness direction of the upper plate body 1. The lower stopper 17 is provided as a plurality of blocks arranged along the axial direction, and a lower bone graft hole 18 is provided between the two lower stoppers 17, and the lower bone graft hole 18 penetrates the lower plate body 2 along the thickness direction of the lower plate body 2.

[0063] In order to facilitate the connection of the fusion device of the present invention with the upper vertebral body and the lower vertebral body, in this embodiment, an upper inverted tooth 19 is provided on the outer plate surface, or the outer surface, of the upper plate body 1, and the upper inverted tooth 19 is used to abut against the lower end plate of the upper vertebral body. The provision of the upper inverted tooth 19 increases the friction between the upper plate body 1 and the lower end plate of the upper vertebral body, and prevents the upper plate body 1 and the lower end plate of the upper vertebral body from sliding relative to each other. A lower inverted tooth is provided on the outer plate surface, or the outer surface, of the lower plate body 2, and the lower inverted tooth is used to abut against the upper end plate of the lower vertebral body. The provision of the lower inverted tooth increases the friction between the lower plate body 2 and the upper end plate of the lower vertebral body, and prevents the lower plate body 2 and the upper end plate of the lower vertebral body from sliding relative to each other. Finally, it should be noted that the terms "include", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without more constraints, an element defined by the phrase "comprising a..." does not exclude the existence of other identical elements in the process, method, article or apparatus comprising the element.

[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An in vivo adjustable fusion device, characterized in that: include: upper plate body; lower plate body; Adjustment components, there are two adjustment components, the two adjustment components are distributed on both sides of the upper plate body and the lower plate body, each of the adjustment components can adjust the expansion and closing of the upper plate body and the lower plate body on the side of the adjustment component, the expansion and closing are formed by the upper plate body and the lower plate body turning outward or inward with the other adjustment component as the fulcrum, and the two adjustment components can also be adjusted simultaneously; The adjustment assembly comprises an upper track member and a lower track member, the cross-sections of the outer surfaces of the upper track member and the lower track member are both arc-shaped, an upper arc-shaped groove adapted to the upper track member is provided on the inner surface of the upper plate body, and a lower arc-shaped groove adapted to the lower track member is provided on the inner surface of the lower plate body; The side of the upper plate body is provided with an upper stop tooth protruding downwards, and the upper stop tooth can abut against the lower plate body; the side of the lower plate body is provided with a lower stop tooth protruding upwards, and the lower stop tooth can abut against the upper plate body; An upper stopper is provided on the inner surface of the upper plate body, the upper stopper is located between the two adjustment components, and the upper stopper and the upper stopper tooth form a space for constraining the upper track member; A lower stopper is provided on the inner surface of the lower plate body, the lower stopper is located between the two adjustment components, and the lower stopper and the lower stopper tooth form a space for constraining the lower track member; An upper clamping groove extending along the circumference of the upper rail member is provided on the outer surface of the upper rail member, and a lower clamping groove extending along the circumference of the lower rail member is provided on the outer surface of the lower rail member; An upper latch pin connected to the upper plate body is radially snapped into the upper latch groove, and a lower latch pin connected to the lower plate body is radially snapped into the lower latch groove.

2. The in vivo adjustable fusion device according to claim 1, characterized in that: The inner surfaces of the upper track member and the lower track member are respectively provided with an upper track and a lower track, and the upper track and the lower track form a wedge-shaped space; The adjustment assembly also includes a sliding block having an upper wedge surface and a lower wedge surface, wherein the upper wedge surface and the lower wedge surface cooperate with the upper track and the lower track respectively, and the sliding block can slide along the upper track and the lower track.

3. The in vivo adjustable fusion device according to claim 2, characterized in that: Along the sliding direction of the sliding block, there are two wedge-shaped spaces, and the small openings of the two wedge-shaped spaces are opposite to each other. There are two sliding blocks, and the two sliding blocks are respectively matched in the two wedge-shaped spaces.

4. The in vivo adjustable fusion device according to claim 3, characterized in that: The adjusting assembly also includes an adjusting rod, on which two sections of threads with opposite rotation directions are arranged, and each section of the threads is threadedly connected with one of the sliding blocks.

5. The in vivo adjustable fusion device according to claim 4, characterized in that: Two limit plates are arranged between the two sections of the thread, the two limit plates are arranged on both sides of the adjusting rod, and the two limit plates are fixedly connected to the upper track member or the lower track member.

6. The in vivo adjustable fusion device according to claim 1, characterized in that: The upper stoppers are multiple and arranged along the axial direction, an upper bone grafting hole is provided between two of the upper stoppers, and the upper bone grafting hole penetrates the upper plate body along the thickness direction of the upper plate body; The lower stoppers are multiple and arranged along the axial direction. A lower bone grafting hole is provided between two of the lower stoppers. The lower bone grafting hole penetrates the lower plate body along the thickness direction of the lower plate body.

7. The in vivo adjustable fusion device according to claim 1, characterized in that: The upper stop tooth is staggered with the lower stop tooth, and a support block is arranged on the side of the lower stop tooth, and the support block can support the upper stop tooth.

8. The in vivo adjustable fusion device according to claim 1, characterized in that: The outer surface of the upper plate body is provided with upper inverted teeth, and the upper inverted teeth are used to abut against the lower end plate of the upper vertebral body; Lower inverted teeth are arranged on the outer surface of the lower plate body, and the lower inverted teeth are used for abutting against the upper end plate of the lower vertebral body.

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