Interbody fusion cage

Abstract

The interbody fusion cage comprises a deformable structure set and two plate bodies, the deformable structure set is arranged between the two plate bodies, the two plate bodies have a critical point distance value, and when the distance between the two plate bodies is larger than the critical point distance value, a plurality of structure parts of the deformable structure set are separated; the deformable structure group has first rigidity, when the distance between the two plate bodies is smaller than or equal to a critical point distance value, the deformable structure group deforms, part of the structure parts of the deformable structure group abut against each other, the interbody fusion cage has second rigidity, and the second rigidity is larger than the first rigidity. The fusion cage can adapt to the in-vivo mechanical environment through the rigidity change of the fusion cage, the small rigidity can be shown when the fusion cage deals with a low load, the high rigidity can be shown when the fusion cage bears a high load effect, and therefore the mechanical adaptation degree between the fusion cage and an adjacent vertebral body is improved, mechanical load transmission is optimized, collapse of the adjacent vertebral body is reduced, and fusion of the vertebral bodies is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to an intervertebral fusion cage. BACKGROUND

[0002] Intervertebral disc degeneration is a common and frequently-occurring disease, and is one of the causes of lower back pain. The disease is frequently-occurring in people aged 20-40 years, and the prevalence rate of the disease in people aged 20 years is 37%, and the prevalence rate of the disease in people aged 80 years is 96%. Intervertebral fusion is an important surgical method for treating spinal degenerative diseases. The intervertebral fusion cage is currently mainly made of a metal titanium alloy material or a high-molecular polymer PEEK material with good biocompatibility, and is internally filled with grafted bone to promote the fusion of upper and lower vertebral bodies, and can not only relieve pressure but also better maintain the intervertebral height and physiological curvature of the cervical spine after surgery. Existing studies have shown that the use of intervertebral fusion cages for surgical fusion and intervertebral height reconstruction is beneficial to relieve compression and plays a role in supporting the intervertebral height, and good clinical effects have been achieved in surgery. As an important instrument used in intervertebral fusion surgery, the intervertebral fusion cage mainly plays a role in restoring the intervertebral space height and physiological curvature, and plays a role in bearing load, so as to promote the fusion of intervertebral bone and reduce a series of complications caused thereby.

[0003] The initial shape of the intervertebral fusion cage is a cylinder, and it has many shortcomings in clinical use, such as small contact area with the endplate, small amount of bone graft, inability to maintain the intervertebral height, and easy subsidence of the fusion cage, and has basically been withdrawn from the clinical market. Subsequently, a cubic intervertebral fusion cage appeared, and this type of fusion cage is currently the most commonly used intervertebral fusion cage in clinical use. The cubic intervertebral fusion cage has a large bone graft space and strong load capacity, but has poor anti-rotation stress and self-stability. In order to improve the self-stability of the cubic intervertebral fusion cage, a self-locking intervertebral fusion cage has been applied in clinical use, and typical examples include the MC+ and ROI-C intervertebral fusion cage products of the French LDR company. This fusion cage is composed of a PEEK material box body and a titanium alloy bone anchoring sheet, and a bone graft can be placed in the center of the box body, and after being implanted into the intervertebral space, the lower titanium alloy clamp will be embedded into the lower vertebral body (ROI is embedded into the upper and lower vertebral bodies). Clinical studies have shown that this self-locking intervertebral fusion cage has achieved good bone fusion, but 9% of patients have the phenomenon of subsidence of the fusion cage into the lower vertebral body. In summary, the intervertebral fusion cages on the market currently have poor matching with patients, and the treatment effect is not good, and the phenomena of collapse, degeneration and fracture of adjacent vertebral bodies frequently occur in clinical application, and in severe cases, secondary surgery is required for revision, which brings great pain to patients.

[0004] The spine, as a support of the trunk, transmits the gravity of the head and the trunk to the pelvis, and allows the trunk to have sufficient physiological movement in three-dimensional space, such as stretching, bending, and axial rotation. The pressure on the intervertebral disc in the anatomical position is far greater than the weight of the upper body, the pressure on the lumbar intervertebral disc in the sitting position is more than 3 times the weight of the trunk, and the actual load on the intervertebral disc in the action of jumping can be more than twice the static position. The flexion, extension and lateral flexion of the spine can produce extension stress in some parts of the intervertebral disc, and the axial torsion of the trunk can also produce shear load on the intervertebral disc, so the pressure on the intervertebral disc is a complex stress of extension, compression and shear varying with time. The intervertebral fusion cage will replace the intervertebral disc after being implanted in the human body, and the interface between the intervertebral fusion cage and the adjacent vertebral body bears and transmits the complex mechanical load in the body. The stiffness of the intervertebral fusion cage on the market is constant, which cannot be well matched with the complex mechanical environment in the body, and cannot realize the optimal transmission of mechanical load in the human body movement, resulting in poor mechanical matching between the intervertebral fusion cage and the adjacent vertebral body, and inducing clinical problems such as collapse, degeneration and fracture of the adjacent segment vertebral body.

[0005] Therefore, the present application is provided. Content of the utility model

[0006] To solve one of the above technical problems, the utility model provides an intervertebral fusion cage.

[0007] The utility model adopts the following technical scheme:

[0008] An intervertebral fusion cage comprises:

[0009] Two plate bodies, the two plate bodies are arranged at intervals;

[0010] A deformable structure group is arranged between the two plate bodies;

[0011] The two plate bodies have a critical point spacing value, when the spacing of the two plate bodies is greater than the critical point spacing value, the plurality of structure parts of the deformable structure group are separated, the deformable structure group has a first stiffness, when the spacing of the two plate bodies is less than or equal to the critical point spacing value, the deformable structure group deforms, the structure parts of the deformed structure group abut, and the intervertebral fusion cage has a second stiffness;

[0012] The second stiffness is greater than the first stiffness.

[0013] Optionally, in the process of the two plate bodies approaching each other, the structure parts of the deformed structure group move towards each other along the arrangement direction of the two plate bodies until abutting;

[0014] And / or, in the process of the two plate bodies approaching each other, the structure parts of the deformed structure group move towards each other along the direction perpendicular to the arrangement direction of the two plate bodies until abutting.

[0015] Optionally, at least part of the adjacent structure parts have side concave structures formed by concave towards each other.

[0016] When the distance between the two plate bodies is greater than the critical point distance value, the side concave structures of the adjacent structure parts have gaps therebetween.

[0017] When the distance between the two plate bodies is equal to or less than the critical point distance value, the side concave structures of the adjacent structure parts abut against each other.

[0018] Optionally, the side concave structures comprise a first inclined part and a second inclined part.

[0019] The first inclined part and the second inclined part have an included angle therebetween.

[0020] One end of the first inclined part and the second inclined part is connected to form an abutting part, and the other end of the first inclined part and the second inclined part is separated.

[0021] When the distance between the two plate bodies is greater than the critical point distance value, the abutting parts of the adjacent structure parts are separated.

[0022] When the distance between the two plate bodies is equal to or less than the critical point distance value, the abutting parts of at least part of the adjacent structure parts abut against each other.

[0023] Optionally, a plurality of side concave structures are arranged on each of the structure parts, and the side concave structures are arranged in sequence along the arrangement direction of the two plate bodies.

[0024] The positions of at least part of the side concave structures on the adjacent structure parts correspond to each other.

[0025] When the distance between the two plate bodies is greater than the critical point distance value, the opposite side concave structures on the adjacent structure parts both have gaps therebetween.

[0026] When the distance between the two plate bodies is equal to or less than the critical point distance value, the abutting parts of the opposite side concave structures on the adjacent structure parts abut against each other.

[0027] Optionally, the adjacent side concave structures on each of the structure parts are concave in different directions, respectively.

[0028] When the distance between the two plate bodies is equal to or less than the critical point distance value, the adjacent two side concave structures on the structure part abut against the corresponding side concave structures on the structure parts on both sides, respectively.

[0029] Optionally, a connecting beam is connected between the adjacent two structure parts.

[0030] Optionally, two side recessed structures of two adjacent structural parts recessed at least partially in a direction away from each other are connected by the connecting beam.

[0031] Optionally, the structural part is any one of a sheet shape, a strip shape, and a three-dimensional structure formed by connecting a plurality of strips.

[0032] Optionally, the structural parts are arranged in sequence along the length direction of the plate body.

[0033] Alternatively, the structural parts are arranged along the length direction and the width direction of the plate body, when the distance between the two plate bodies is greater than the critical distance, along the length direction of the plate body, adjacent structural parts have a gap, and along the width direction of the plate body, adjacent structural parts have a gap; when the distance between the two plate bodies is less than or equal to the critical distance, along the length direction of the plate body, several adjacent structural parts abut, and along the width direction of the plate body, several adjacent structural parts abut.

[0034] By adopting the above technical solution, the present application has the following intended effects:

[0035] The interbody fusion cage of the present application can adapt to the in-vivo mechanical environment by changing its own stiffness, exhibit small stiffness when coping with low load, and exhibit high stiffness when bearing high load, thereby improving the mechanical adaptation degree with adjacent vertebral bodies, realizing optimized mechanical load transmission, reducing adjacent vertebral body collapse, and promoting vertebral body fusion.

[0036] The specific embodiments of the present application will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings, which are part of the present application, serve to provide a further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0038] Figure 1 A side view of a first intervertebral fusion cage provided by an embodiment of the present application is shown;

[0039] Figure 2 A perspective view of the first intervertebral fusion cage provided by the embodiment of the present application is shown;

[0040] Figure 3 A perspective view of a second intervertebral fusion cage provided by an embodiment of the present application is shown;

[0041] Figure 4 Fig. 6 shows another perspective view of the third intervertebral cage provided by the embodiments of the present application;

[0042] Figure 5 Fig. 7 shows a side view of the third intervertebral cage shown in Fig. 6; Figure 4

[0043] Figure 6 Fig. 8 shows a front view of the third intervertebral cage shown in Fig. 6; Figure 4

[0044] Figure 7 Fig. 9 shows a structural schematic view of a deformable structure group of the fourth intervertebral cage provided by the embodiments of the present application;

[0045] Figure 8 Fig. 10 shows a state view of the fourth intervertebral cage provided by the embodiments of the present application implanted in a vertebral body;

[0046] Figure 9 Fig. 11 shows a structural schematic view of a deformable structure group of the fifth intervertebral cage provided by the embodiments of the present application;

[0047] Figure 10 Fig. 12 shows a state view of the fifth intervertebral cage provided by the embodiments of the present application implanted in a vertebral body;

[0048] Figure 11 Fig. 13 shows a structural schematic view of a deformable structure group of the sixth intervertebral cage provided by the embodiments of the present application;

[0049] Figure 12 Fig. 14 shows a structural schematic view of a deformable structure group of the seventh intervertebral cage provided by the embodiments of the present application.

[0050] In the drawings: 100, intervertebral cage; 1, plate body; 2, deformable structure group; 21, structure part; 21a, through hole; 211, side concave structure; 211a, first inclined part; 211b, second inclined part; 211c, abutting part; 22, connecting beam; 200, cone.

[0051] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but are merely to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below by referring to the drawings of the embodiments of the present application, and the following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0053] ​​In the description of the utility model, it needs to explain, the term "upper", "lower", "inner", "outer" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or component must have a specific orientation, with a specific orientation structure and operation, therefore cannot be understood as the limitation of the utility model.

[0054] In the description of the utility model, it needs to explain, unless otherwise explicitly provided and limited, the term "installation", "connection" should be broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, also can be indirectly connected through intermediate medium.

[0055] Referring to Figures 1 to 12 The application provides an intervertebral fusion cage 100, comprising: two plate bodies 1 and a deformable structure group 2. The two plate bodies 1 are arranged at intervals, and are used to cooperate with upper and lower vertebral bodies respectively. The deformable structure group 2 is arranged between the two plate bodies 1. The deformable structure group 2 can have a plurality of structure parts 21. Each structure part 21 can be connected to each other or can be independent. Each structure part 21 can also be partially connected and partially independent. During relative movement of the two plate bodies 1, each structure part 21 can change position relative to each other. The two plate bodies 1 have a critical point interval value. When the interval of the two plate bodies 1 is greater than the critical point interval value, the plurality of structure parts 21 of the deformable structure group 2 are separated, and the deformable structure group 2 has a first rigidity. When the interval of the two plate bodies 1 is less than or equal to the critical point interval value, the deformable structure group 2 deforms, at least part of the structure parts 21 of the deformable structure group abut, and the intervertebral fusion cage has a second rigidity. The second rigidity is greater than the first rigidity.

[0056] It should be noted that the first rigidity and the second rigidity can be a single value or an interval range.

[0057] The operator can implant the intervertebral fusion cage 100 provided by the application into the human body between the cones 200 with the help of the holder, and can implant a nail rod outside the vertebral body 200 to fix the cone, so as to achieve a stable effect. Figure 8 And Figure 10 Two state diagrams of the intervertebral fusion cage 100 provided by the application are respectively shown.

[0058] The fusion device of the present application can adapt to the mechanical environment in the body by changing its own stiffness. It can exhibit lower stiffness when responding to low loads and higher stiffness when subjected to high loads, thereby improving the mechanical adaptability with adjacent vertebrae, optimizing mechanical load transfer, reducing adjacent vertebral collapse, and promoting vertebral fusion.

[0059] In some possible implementations, see Figure 7 、 Figure 11 and Figure 12 As shown, in the process of the two plates 1 approaching each other, part of the structural portion 21 of the deformation structure group (the position indicated by the number 211) moves toward each other along the arrangement direction of the two plates 1 (such as the up and down direction), that is, it moves roughly along the thickness direction of the plate 1 until they collide with each other, thereby causing a sudden change in the stiffness of the intervertebral fusion cage to facilitate bearing high loads.

[0060] In some possible implementations, see Figures 1 to 6 as well as Figure 9 As shown, when the two plates 1 approach each other, the partial structural portion 21 of the deformation structure group moves toward each other along the arrangement direction perpendicular to the two plates 1, that is, moves roughly along the length direction of the plates 1 until they collide with each other.

[0061] See also Figure 7 As shown, during the process of the two plates 1 approaching each other, the partial structural portion 21 of the deformable structural group (indicated by the position numeral 211) moves toward each other along the arrangement direction of the two plates 1 (e.g., the vertical direction) until they abut against each other. The partial structural portion 21 of the deformable structural group moves toward each other perpendicular to the arrangement direction of the two plates 1, that is, moves approximately along the length direction of the plates 1 until they abut against each other.

[0062] When the intervertebral fusion cage is subjected to low loads, the numerous structural components 21 of the deformable structural group have gaps between them and are not in contact. The entire intervertebral fusion cage has low elasticity and is easily deformed, resulting in a low reaction force on the vertebral middle plate. However, if the patient lifts heavy objects, the intervertebral fusion cage is subjected to greater forces, and the two plates 1 move closer together until the numerous structural components 21 contact each other. This causes the intervertebral fusion cage's stiffness to increase dramatically, significantly improving its support performance.

[0063] In some possible embodiments, in each of the structural portions 21, at least some adjacent structural portions 21 have side concave structures 211 that are recessed toward each other. When the distance between the two plate bodies 1 is greater than the critical point spacing value, there is a gap between the side concave structures 211 of adjacent structural portions 21. When the distance between the two plate bodies 1 is equal to or less than the critical point spacing value, the side concave structures 211 of adjacent structural portions 21 offset each other.

[0064] The undercut structure 211 itself is not straight and is susceptible to deformation when subjected to force. When the undercut structure 211 is extended in the first direction as a whole, and a compressive force is applied to its ends, the undercut structure 211 may bulge in the second direction. In other words, when the undercut structure 211 is subjected to an external force in the first direction, it will significantly deform and move in the second direction. The first and second directions can be perpendicular. One of the first and second directions can be the thickness direction of the plate 1, and the other can be the length direction of the plate 1.

[0065] In some possible implementations, see Figure 1 As shown, the undercut structure 211 includes a first inclined portion 211a and a second inclined portion 211b, wherein the first inclined portion 211a and the second inclined portion 211b have an included angle therebetween. One end of the first inclined portion 211a and the second inclined portion 211b are connected to form an abutment portion 211c, and the other ends of the first inclined portion 211a and the second inclined portion 211b are separated. When the distance between the two plates 1 is greater than the critical point distance value, the abutment portions 211c of the adjacent structural portions 21 are separated. When the distance between the two plates 1 is less than or equal to the critical point distance value, the abutment portions 211c of at least some adjacent structural portions 21 abut against each other. The first inclined portion 211a and the second inclined portion 211b can be straight structures, arc-shaped structures, etc., and this application does not limit the specific structure of the inclined portion.

[0066] It should be noted that when the distance between the two plates 1 is less than or equal to the critical point distance value, the structural parts 21 can be offset in pairs, that is, the structural parts 21 can be offset in pairs, or multiple structural parts 21 can be in contact with each other.

[0067] In some possible implementations, see Figures 4 to 6 As shown, a plurality of undercut structures 211 are provided on each of the structural portions 21, and the undercut structures 211 are sequentially arranged along the arrangement direction of the two plate bodies 1, and at least some of the undercut structures 211 on adjacent structural portions 21 correspond one to one. When the spacing between the two plate bodies 1 is greater than the critical point spacing value, the relative undercut structures 211 on the adjacent structural portions 21 have gaps. When the spacing between the two plate bodies 1 is less than or equal to the critical point spacing value, the abutting top portions 211c of the relative undercut structures 211 on the adjacent structural portions 21 abut against each other.

[0068] The structures can be independent of each other and connected to the plate body 1, or the structures can be connected to each other to form a complex whole. When the distance between the two plate bodies 1 is large, a plurality of side recess structures 211 can be arranged on the structure part 21, and the structure part 21 can be substantially wave-shaped, and the two ends are connected to the two plate bodies 1, respectively. Arranging more side recess structures 211 on the structure part 21 is conducive to increasing the stability of the intervertebral fusion cage.

[0069] Specifically, adjacent side recess structures 211 on each structure part 21 are recessed in different directions, respectively. When the distance between the two plate bodies 1 is less than or equal to the critical point distance value, the two adjacent side recess structures 211 on the structure part 21 are in contact with the corresponding side recess structures 211 on the structure part 21 on the two sides, respectively. By arranging the adjacent side recess structures 211 to be recessed in different directions, respectively, the density of the effective abutting part 211c can be increased, the stability of the intervertebral fusion cage can be increased, the service life of the intervertebral fusion cage can be prolonged, and the reliability of the intervertebral fusion cage can be improved.

[0070] In some possible embodiments, referring to Figure 5 , Figure 6 and Figure 11 , a connecting beam 22 is connected between the two adjacent structure parts 21. Thus, the structures are connected to form a whole, so that the deformation of the deformable structure is controllable, the deformation of the deformable structure group 2 in the length direction of the plate body 1 is prevented from being too large, and the stability of the deformable structure group 2 is further improved.

[0071] Specifically, the two side recess structures 211 recessed in the direction away from each other among the two adjacent structure parts 21 are connected by the connecting beam 22. The distance between the two side recess structures 211 recessed in the direction away from each other is large, and each is adapted to be provided with the connecting beam 22, and the connecting beam 22 is connected to the recessed side of the abutting part 211c, without affecting the abutting cooperation of the abutting part 211c and the corresponding abutting part 211c of the adjacent structure part 21.

[0072] In some possible embodiments, the structure part 21 is any one of a sheet shape, a strip shape, and a three-dimensional structure formed by connecting a plurality of strip bodies. The structure part 21 can have different shapes, and the application does not limit the specific structure and shape of the structure part 21. When the structure part 21 is a sheet shape, a through hole 21a can be formed in the structure part 21.

[0073] In some possible embodiments, referring to Figures 4 to 6 , the structure parts 21 are arranged in sequence along the length direction of the plate body 1, or the structure parts 21 are arranged along the length direction and the width direction of the plate body 1. When the distance between the two plate bodies 1 is greater than the critical point distance value, referring toFigure 5 As shown, in the length direction of the plate body 1, adjacent structural parts 21 have gaps, see Figure 6 As shown, in the width direction of the plate body 1, adjacent structural parts 21 have gaps. When the interval of two plate bodies 1 is less than or equal to the critical point interval value, in the length direction of the plate body 1, several adjacent structural parts 21 abut, and in the width direction of the plate body 1, several adjacent structural parts 21 abut.

[0074] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed as above with reference to the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application still belong to the scope of the present application.

Claims

1. An intervertebral cage, comprising: The intervertebral fusion cage comprises: two plate bodies, the two plate bodies being spaced apart; a deformable structure group, the deformable structure group being arranged between the two plate bodies; the two plate bodies have a critical point spacing value, when the spacing between the two plate bodies is greater than the critical point spacing value, the deformable structure group is in a state of phase separation, the deformable structure group has a first stiffness, when the spacing between the two plate bodies is less than or equal to the critical point spacing value, the deformable structure group is deformed, the deformable structure group has a second stiffness, and the second stiffness is greater than the first stiffness; during the process of the two plate bodies approaching each other, part of the structure group moves in the arrangement direction of the two plate bodies until abutting; 2. The intervertebral cage of claim 1, wherein, and / or, during the process of the two plate bodies approaching each other, part of the structure group moves in the direction perpendicular to the arrangement direction of the two plate bodies until abutting. At least part of the adjacent structure groups have side concave structures formed by concave in opposite directions; 3. The intervertebral cage of claim 1, wherein, when the spacing between the two plate bodies is greater than the critical point spacing value, the side concave structures of the adjacent structure groups have gaps therebetween; when the spacing between the two plate bodies is less than or equal to the critical point spacing value, the side concave structures of the adjacent structure groups abut. The side concave structures comprise a first inclined portion and a second inclined portion; 4. The intervertebral cage of claim 3, wherein, the first inclined portion and the second inclined portion have an included angle therebetween; one end of the first inclined portion and the second inclined portion is connected to form an abutting portion, and the other end of the first inclined portion and the second inclined portion is separated; when the spacing between the two plate bodies is greater than the critical point spacing value, the abutting portions of the adjacent structure groups are separated; when the spacing between the two plate bodies is less than or equal to the critical point spacing value, at least part of the abutting portions of the adjacent structure groups abut. A plurality of side concave structures are arranged on each structure group, and the side concave structures are arranged in sequence along the arrangement direction of the two plate bodies; 5. The intervertebral cage of claim 3, wherein, at least part of the side concave structures of the adjacent structure groups are in one-to-one correspondence in position; when the spacing between the two plate bodies is greater than the critical point spacing value, the side concave structures of the adjacent structure groups have gaps therebetween; when the spacing between the two plate bodies is less than or equal to the critical point spacing value, the abutting portions of the side concave structures of the adjacent structure groups abut. The adjacent side concave structures of each side concave structure group on each structure group are concave in different directions respectively; 6. The intervertebral cage of claim 5, wherein, when the spacing between the two plate bodies is less than or equal to the critical point spacing value, the adjacent side concave structures of each structure group abut with the corresponding side concave structures on the structure groups on both sides respectively. A connecting beam is connected between the adjacent two structure groups.

7. The intervertebral cage of claim 6, wherein, The connecting beam is connected between at least part of the two side concave structures of the adjacent two structure groups which are concave in the direction away from each other.

8. The intervertebral cage of claim 7, wherein, The structure group is in any one of a sheet shape, a strip shape, and a three-dimensional structure formed by connecting a plurality of strip bodies.

9. The intervertebral cage according to any of claims 1-8, wherein, The structure groups are arranged in sequence along the length direction of the plate bodies.

10. The intervertebral implant as in one of claims 1-8, wherein, ​ Alternatively, the structural parts are arranged along the length direction and the width direction of the plate body. When the distance between the two plate bodies is greater than the critical distance, in the length direction of the plate body, adjacent structural parts have a gap, and in the width direction of the plate body, adjacent structural parts have a gap. When the distance between the two plate bodies is less than or equal to the critical distance, in the length direction of the plate body, several adjacent structural parts abut, and in the width direction of the plate body, several adjacent structural parts abut.

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