CN112494183B

CN112494183B - Intervertebral fusion device

Info

Publication number: CN112494183B
Application number: CN202011381073.1A
Authority: CN
Inventors: 李健; 袁博文; 姚得志; 郭宇辰; 刘斌; 刘爽; 戴文骏; 施聪聪
Original assignee: Beijing Libeier Bio Engineering Institute Co Ltd
Current assignee: Beijing Libeier Bio Engineering Institute Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2024-09-03
Anticipated expiration: 2040-11-30
Also published as: CN112494183A

Abstract

The present application provides an intervertebral fusion device, comprising: the fusion body comprises a first frame, a second frame and a plurality of bending plates, wherein the bending plates are arranged between the first frame and the second frame at intervals, and a through space which is vertically communicated is formed in the fusion body; the first plate body is arranged at the upper end of the fusion body and is provided with a first window communicated with the through space; the second plate body is arranged at the lower end of the fusion body and is provided with a second window communicated with the through space. The technical scheme of the application effectively solves the problem of complications caused by subsidence of the fusion cage prosthesis after operation in the related technology.

Description

Intervertebral fusion device

Technical Field

The invention relates to the field of medical instruments, in particular to an intervertebral fusion device.

Background

Intervertebral disc degeneration is a common orthopedic disease, and modern medicine has been quite mature in treating intervertebral disc degeneration by performing an intervertebral fusion operation, but in some cases, since an implanted conventional intervertebral fusion device can only be used as an implant for supporting the intervertebral space, the common intervertebral fusion device implant is usually made of a titanium alloy material or a PEEK material, or made of a titanium alloy material by adopting a 3D printing technology.

Lumbar interbody fusion is one of the methods of treating spinal disorders, with an increasing number of people receiving interbody fusion every year. Lumbar interbody fusion is often complicated by the fact that the stiffness of the fusion cage prosthesis is far greater than the stiffness of the bones of the body's own vertebral bodies, and the fusion cage prosthesis is sunk after surgery.

Disclosure of Invention

The invention mainly aims to provide an intervertebral fusion device which solves the problem that a fusion device prosthesis is sunk after operation in the related art to cause complications.

In order to achieve the above object, the present invention provides an interbody fusion cage comprising: the fusion body comprises a first frame, a second frame and a plurality of bending plates, wherein the bending plates are arranged between the first frame and the second frame at intervals, and a through space which is vertically communicated is formed in the fusion body; the first plate body is arranged at the upper end of the fusion body and is provided with a first window communicated with the through space; the second plate body is arranged at the lower end of the fusion body and is provided with a second window communicated with the through space.

Further, the through space includes a first through hole provided on the first frame, a second through hole provided on the second frame, and a third through hole provided between the plurality of curved plates.

Further, each bending plate comprises a first bending section and two second bending sections respectively positioned at two ends of the first bending section, one of the two second bending sections is connected with the first frame, the other is connected with the second frame, and the bending direction of the first bending section is opposite to that of the second bending section.

Further, the fusion body further includes a first cylinder connected between the first frame and the second frame and a second cylinder connected between the first frame and the second frame, the through space is located between the first cylinder and the second cylinder, an axis of the first cylinder is parallel to or inclined to an axis of each curved plate, and an axis of the second cylinder is parallel to or inclined to an axis of each curved plate.

Further, the first cylinder includes a left half cylinder and a right half cylinder, and a bending direction of the bending plate facing the left half cylinder is the same as a bending direction of the left half cylinder among the plurality of bending plates, and a bending direction of the bending plate facing the right half cylinder is the same as a bending direction of the right half cylinder among the plurality of bending plates.

Further, the first plate body and the second plate body both comprise a plate body and tooth-shaped portions arranged on the plate body, and the tooth-shaped portions are located on the surface, far away from the fusion body, of the plate body.

Further, the tooth profile comprises a plurality of triangular teeth and/or a plurality of trapezoidal teeth and/or a plurality of saw tooth teeth.

Further, the height of the middle portion of the intersomatic cage is greater than the height of the ends of the intersomatic cage.

Further, the interbody fusion cage further comprises a first embedding layer formed through an injection molding or die casting process, the first plate body is connected with the fusion body through the first embedding layer, the interbody fusion cage further comprises a second embedding layer formed through an injection molding or die casting process, and the second plate body is connected with the fusion body through the second embedding layer.

Further, the first plate body, the second plate body, the first frame and the second frame are all arc-shaped.

By applying the technical scheme of the application, the interbody fusion cage comprises: fusion body, first plate body and second plate body. The fusion body includes a first frame, a second frame, and a plurality of curved plates. The plurality of curved plates are disposed between the first frame and the second frame at intervals. The fusion body is provided with a through space which is vertically communicated. The first plate body is arranged at the upper end of the fusion body and is provided with a first window communicated with the through space. The second plate body is arranged at the lower end of the fusion body and is provided with a second window communicated with the through space. Taking out the lumbar intervertebral disc which is positioned between the lumbar vertebrae bodies of two adjacent sections and needs to be replaced, forming a movable gap between the lumbar vertebrae bodies of the two adjacent sections, implanting an intervertebral fusion device into the movable gap, connecting a first plate body with the lumbar vertebrae body of one section above, and connecting a second plate body with the lumbar vertebrae body or the sacrum of the section below. Because the fusion body is located between the first plate body and the second plate body and can fix and support the first plate body and the second plate body, under the condition that the first plate body and the second plate body apply force to the fusion body respectively, the plurality of bending plates can generate elastic deformation under the action of the acting force, so that the first plate body and the second plate body can elastically move within a certain controllable range. The first plate body is in direct contact with the lumbar vertebral body of the upper section, the second plate body is in direct contact with the lumbar vertebral body of the lower section, the first frame and the second frame cover the plurality of bending plates, the first frame effectively supports the first plate body and the second frame effectively supports the second plate body under the effect of effectively supporting the plurality of bending plates, the intervertebral fusion device has good mechanical stability, the intervertebral fusion device realizes good supporting effect, and the intervertebral fusion device further supports the spinal vertebral body well. The plurality of bending plates are arranged at intervals to form a hollowed-out structure, so that the elastic modulus and the weight of the interbody fusion cage can be greatly reduced, and the rigidity of the interbody fusion cage is smaller than or equal to that of a human body's own vertebral bone. Thus, the intervertebral fusion device can greatly reduce the rigidity of the fusion device prosthesis in the related technology and avoid subsidence of the intervertebral fusion device after operation. And simultaneously filling the granular bone into the through space through the gaps between the adjacent bending plates, and placing the slow-release medicine with viscosity in the gaps between the adjacent bending plates and outside the granular bone. The granular bones can be contacted with the lumbar vertebrae bodies of one section above through the first window, the granular bones can be contacted with the lumbar vertebrae bodies or the sacrums of one section below through the second window, and the peripheries of the plurality of bending plates form a penetrating structure, so that soft tissue adhesion and blood transport are facilitated, and a good nutritional environment is provided for the osteogenesis of the first plate body and the second plate body. Therefore, the technical scheme of the application effectively solves the problem of complications caused by subsidence of the postoperative fusion cage prosthesis in the related technology.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a schematic perspective view of an embodiment of an interbody cage according to the present invention;

FIG. 2 shows a schematic perspective view of the interbody cage of FIG. 1 implanted between adjacent lumbar vertebrae;

FIG. 3 shows a schematic front view of the interbody cage of FIG. 1;

FIG. 4 shows a schematic side view of the interbody cage of FIG. 1;

FIG. 5 shows a schematic top view of the interbody cage of FIG. 1;

FIG. 6 shows an exploded front view of the interbody cage of FIG. 1;

FIG. 7 shows a schematic perspective view of the fusion body of FIG. 1;

FIG. 8 shows a schematic top view of the fusion body of FIG. 7; and

Fig. 9 shows a schematic side view of the fusion body of fig. 7.

Wherein the above figures include the following reference numerals:

1. Lumbar vertebral body; 2. lumbar disc; 3. an intervertebral fusion device; 10. a fusion body; 111. a first frame; 112. a second frame; 113. a first through hole; 114. a second through hole; 115. a third through hole; 12. bending the plate; 121. a first curved section; 122. a second curved section; 131. a first cylinder; 1311. a left half cylinder; 1312. a right half cylinder; 132. a second cylinder; 133. a first connection section; 134. a second connection section; 14. a through space; 20. a first plate body; 21. a board body; 22. a tooth-shaped portion; 23. a first window; 30. a second plate body; 31. a second window; 41. a first chimeric layer; 42. and a second embedding layer.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

As shown in fig. 1 to 6, the interbody fusion cage of the present embodiment includes: a fusion body 10, a first plate 20 and a second plate 30. The fusion body 10 includes a first frame 111, a second frame 112, and a plurality of curved plates 12. The plurality of curved plates 12 are disposed between the first frame 111 and the second frame 112 at intervals. The fusion body 10 is provided with a through space 14 penetrating up and down. The first plate body 20 is provided at the upper end of the fusion body 10, and the first plate body 20 has a first window 23 communicating with the through space 14. The second plate 30 is provided at the lower end of the fusion body 10, and the second plate 30 has a second window 31 communicating with the through space 14.

By applying the technical scheme of the embodiment, the lumbar intervertebral disc 2 which is positioned between the lumbar vertebrae 1 of two adjacent sections and needs to be replaced is taken out, a movable gap is formed between the lumbar vertebrae 1 of the two adjacent sections, the intervertebral fusion device 3 is implanted into the movable gap, the first plate 20 is connected with the lumbar vertebrae 1 of the section above, and the second plate 30 is connected with the lumbar vertebrae 1 or the sacrum of the section below. Because the fusion body 10 is located between the first plate body 20 and the second plate body 30 and can fix and support the first plate body 20 and the second plate body 30, under the condition that the first plate body 20 and the second plate body apply force to the fusion body 10 respectively, the plurality of bending plates 12 can generate elastic deformation when receiving the acting force, so that the first plate body 20 and the second plate body 30 can elastically move within a certain controllable range. The first plate body 20 is in direct contact with the lumbar vertebra body 1 of the upper section, the second plate body 30 is in direct contact with the lumbar vertebra body 1 of the lower section, the first frame 111 and the second frame 112 cover the plurality of bending plates 12, under the effect that the plurality of bending plates 12 are effectively supported, the first frame 111 is used for effectively supporting the first plate body 20 and the second frame 112 is used for effectively supporting the second plate body, so that the intervertebral fusion device has good mechanical stability, the intervertebral fusion device realizes good supporting effect, and the intervertebral fusion device further performs good supporting on the vertebral column body. The plurality of curved plates 12 are arranged at intervals to form a hollow structure, so that the elastic modulus and the weight of the interbody fusion cage can be greatly reduced, and the rigidity of the interbody fusion cage is smaller than or equal to the rigidity of the bone of the human body. Thus, the intervertebral fusion device of the embodiment can greatly reduce the rigidity of the fusion device prosthesis in the related technology and avoid subsidence of the intervertebral fusion device after operation. While the granular bone is filled into the through space 14 through the gap between the adjacent curved plates 12, and the slow-release drug having viscosity is placed in the gap between the adjacent curved plates 12 and outside the granular bone. The granular bones can be contacted with the lumbar vertebra 1 of the upper section through the first window 23, the granular bones can be contacted with the lumbar vertebra 1 or the sacrum of the lower section through the second window 31, and the periphery of the plurality of bending plates 12 form a penetrating structure, so that soft tissue adhesion and blood circulation are convenient to form, and a good nutrition environment is provided for the osteogenesis of the first plate body 20 and the second plate body 30. Therefore, the technical scheme of the embodiment effectively solves the problem of complications caused by subsidence of the postoperative fusion cage prosthesis in the related art.

In this embodiment, the first frame 111 and the second frame 112 are truss structures, so that the interbody fusion cage has good stability and overall rigidity. Each curved plate 12 has a C-shaped configuration, which facilitates compression and adjustment of the cage in the height direction.

As shown in fig. 1, 7 and 9, in order to achieve good blood supply and soft tissue adhesion, the through space 14 includes a first through hole 113 provided on the first frame 111, a second through hole 114 provided on the second frame 112, and a third through hole 115 provided between the plurality of curved plates 12. In this way, the first through hole 113, the second through hole 114 and the third through hole 115 enable the blood circulation to be smoother, which is beneficial to promoting the bone particles in the through space 14 to realize faster osseous fusion with the lumbar vertebral body 1 of two adjacent segments.

As shown in fig. 3 and 6, in order for each curved plate 12 to have sufficient structural strength, each curved plate 12 includes a first curved section 121 and two second curved sections 122 located at both ends of the first curved section 121, respectively. One of the two second curved sections 122 is connected to the first frame 111, and the other is connected to the second frame 112. The bending direction of the first bending section 121 is opposite to the bending direction of the second bending section 122. This results in each curved plate 12 having a high structural strength. Meanwhile, in the case where the first plate body 20 and the second plate body 30 apply force to the fusion body 10, respectively, when the first plate body 20 applies force to the first frame 111, and simultaneously, when the second plate body 30 applies force to the second frame 112, the first frame 111 and the second frame 112 together apply force to the curved plate 12 greater than the elastic force of the curved plate 12, and the plurality of curved plates 12 can achieve plastic shrinkage. When the second plate body 30 applies a force to the second frame 112, and at the same time, when the second plate body 30 applies a force to the second frame 112, the first frame 111 and the second frame 112 together apply a force to the bending plate 12 smaller than the elastic force of the bending plate 12, and the plurality of bending plates 12 can achieve plastic rebound. And the elastic modulus of the whole interbody fusion cage can be reduced.

In this embodiment, both the first plate body 20 and the second plate body 30 are preferably bone-like trabecular structures. Thus, the first and second plates 20 and 30 each have a plurality of grid cells inside, with the pivot point of each grid cell being coupled to the pivot point of an adjacent cell. The pore of the bone trabecular structure is 300um-500 um. The first plate 20 and the second plate 30 are both designed in an anatomical form, which conforms to the anatomical form of the human body. More preferably, both the first plate body 20 and the second plate body 30 are 3D metal bone trabecular structures.

As shown in fig. 1, 3, 6 and 7, the fusion body 10 further includes a first cylinder 131 connected between the first frame 111 and the second frame 112, and a second cylinder 132 connected between the first frame 111 and the second frame 112. The through space 14 is located between the first cylinder 131 and the second cylinder 132, the axis of the first cylinder 131 being parallel to the axis of each curved plate 12, and the axis of the second cylinder 132 being parallel to the axis of each curved plate 12. The first barrel 131 and the second barrel 132 can form a channel to facilitate filling of the granular bone and the sustained release drug into the interbody fusion cage. Specifically, the granular bone is filled into the through space 14 through the first cylinder 131, and the viscous slow-release medicine is placed in the first cylinder 131 and the second cylinder 132, so that fusion of multiple effects is easy to realize, and better postoperative curative effect is realized. This facilitates passage of the particulate bone and placement of the slow-release drug in the gap between adjacent curved plates 12. The slow release drug is preferably BMP (bone morphogenic protein) and/or an anti-inflammatory drug. In the present embodiment, the diameters of the inner holes of the first cylinder 131 and the second cylinder 132 are each preferably 4mm.

Of course, in embodiments not shown in the other figures, the axis of the first cylinder is inclined to the axis of each curved plate, or the axis of the second cylinder is inclined to the axis of each curved plate.

As shown in fig. 3 and 6, the first cylinder 131 includes a left half cylinder 1311 and a right half cylinder 1312. The bending direction of the bending plate 12 of the plurality of bending plates 12 toward the left half cylinder 1311 is the same as the bending direction of the left half cylinder 1311, and the bending direction of the bending plate 12 of the plurality of bending plates 12 toward the right half cylinder 1312 is the same as the bending direction of the right half cylinder 1312. In this way, the plurality of curved plates 12 can both osseointegrate with the first frame 111 and provide a good axial compression stiffness, thus enabling a height-adjustable interbody fusion cage.

As shown in fig. 1 and 3, in order to achieve better friction and initial stability of the first plate 20 with the lumbar vertebral body 1 of the upper section and better friction and initial stability of the second plate 30 with the lumbar vertebral body 1 of the lower section, each of the first plate 20 and the second plate 30 includes a plate body 21 and a tooth-shaped portion 22 provided on the plate body 21, the tooth-shaped portion 22 being located on a surface of the plate body 21 remote from the fusion body 10. Thus, the surface of the first plate 20 far away from the fusion body 10 and the surface of the second plate 30 far away from the fusion body 10 can form a rough surface, and the rough surface can be combined with the upper lumbar vertebrae 1 and the lower lumbar vertebrae 1 in an embedded manner, so that an initial stabilizing function is provided for the implanted interbody fusion cage 3 to support the upper lumbar vertebrae 1 and the lower lumbar vertebrae 1. In this way, bone cells and micro blood vessels grow in along micropores of the bone-like trabecular structure in the rehabilitation process of the patient, and finally the active fusion embedded intervertebral fusion device is formed. In this embodiment, the tooth 22 is a hydroxyapatite coating. The hydroxyapatite coating is obtained by high-temperature spraying or electrochemical deposition.

As shown in fig. 1 and 3, in order to increase the friction force of the first plate body 20 and the second plate body 30, good early stability is achieved. The tooth 22 includes a plurality of saw tooth teeth, which increases the stability of the initial fixation of the first plate 20 and the second plate 30, allowing long term fixation after bone ingrowth. The plurality of saw tooth teeth can form a wave structure.

Of course, in embodiments not shown in other figures, the tooth profile includes a plurality of saw tooth teeth, a plurality of triangular teeth, and a plurality of trapezoidal teeth. Or the tooth profile comprises only a plurality of triangular teeth or a plurality of trapezoidal teeth.

As shown in fig. 1 and 3, the middle portion of the cage has a height greater than the heights of the ends of the cage. Therefore, the structure of the interbody fusion cage is convenient to implant between the lumbar vertebrae bodies 1 of two adjacent sections, is not easy to deviate from after being implanted, has small damage to the vertebral column, and can open the lumbar vertebrae bodies 1 of two adjacent sections only by implanting a single interbody fusion cage.

As shown in fig. 3, the interbody fusion cage further includes a first engagement layer 41 formed through an injection molding process, and the first plate 20 is connected to the fusion body 10 through the first engagement layer 41. The interbody fusion cage further includes a second engagement layer 42 formed by an injection molding process, and the second plate 30 is connected to the fusion body 10 by the second engagement layer 42. The first and second engaging layers 41 and 42 can form a better fixing and condensing state, and can ensure that the interbody fusion cage can provide good stability and safety. Specifically, the first plate body 20 having the bone-like trabecular structure is connected to the first frame 111 via the first fitting layer 41. The second plate body 30 having the bone-like trabecular structure is connected to the second frame 112 through the second fitting layer 42.

Of course, in embodiments not shown in other figures, the interbody fusion cage further includes a first chimeric layer formed by a die-casting process. The interbody cage further includes a second chimeric layer formed by a die casting process.

As shown in fig. 1, 6 and 7, the first plate 20, the second plate 30, the first frame 111 and the second frame 112 are all arc-shaped. Thus, after the intervertebral fusion device 3 is implanted between the lumbar vertebrae 1 of two adjacent segments, the arc-shaped first plate body 20 and the arc-shaped second plate body 30 can be embedded with surrounding physiological bone structures and can perform bone fusion, so that the purpose of long-term stable support is achieved.

As shown in fig. 1,6 and 7, in order to achieve that the first cylinder 131 is located between the first frame 111 and the second frame 112, the first cylinder 131 is connected between the first frame 111 and the second frame 112 by two first connection sections 133. In order to realize that the second cylinder 132 is located between the first frame 111 and the second frame 112, the second cylinder 132 is connected between the first frame 111 and the second frame 112 by two second connecting sections 134.

As shown in fig. 6, the arc length of the first curved section 121 is greater than the arc length of the second curved section 122. In this way, on the one hand, the first bending section 121 can generate better elasticity, and one second bending section 122 can ensure that the first bending section 121 and the first frame 111 have better connection strength, and the other second bending section 122 can ensure that the first bending section 121 and the second frame 112 have better connection strength.

As shown in fig. 3 and 6, the thickness of the first end of the first plate body 20 gradually decreases from the second end of the first plate body 20 to the first end of the first plate body 20, and the thickness of the second end of the second plate body 30 is equidistantly arranged from the first end of the first plate body 20 to the second end of the first plate body 20. The thickness of the first end of the second plate 30 gradually decreases from the second end of the second plate 30 to the first end of the second plate 30, and the thickness of the second end of the second plate 30 is equidistantly arranged from the first end of the second plate 30 to the second end of the second plate 30. Thus, the shapes of the first plate body 20 and the second plate body 30 are convenient to adopt a lateral approach implantation method, so that the implant is convenient between the lumbar vertebrae bodies 1 of two adjacent sections, and the function of expanding the lumbar vertebrae bodies 1 of two adjacent sections can be completed, so that the operation is simple.

As shown in fig. 8, the overall shape of the top view of the fusion body 10 is rectangular. In this embodiment, the dimensions of the fusion body 10, the first plate 20 and the second plate 30 are obtained according to different CT scan data, so as to form an inter-vertebral fusion device 3 with multiple anatomical dimensions, and ensure that the surrounding tissues in contact with the inter-vertebral fusion device 3 keep the original position state, so that the fusion surface on the outer side of the inter-vertebral fusion device and the physiological joint surface of the adjacent vertebral body achieve good anastomosis.

The first plate body 20 and the second plate body 30 of the present embodiment are manufactured using a 3D printing process. The fusion body 10 is made of PEEK material, the 3D printed first plate body 20 and second plate body 30 can better achieve the postoperative bone fusion effect by titanium alloy trabeculae, and the fusion body 10 made of PEEK material can reduce the overall weight of the intervertebral fusion device.

Of course, the material of the interbody cage is made of medical metals including, but not limited to, titanium and titanium alloys, cobalt alloys, stainless steel, tantalum metal, magnesium alloys, and peek materials.

Of course, the fusion body, the first plate body and the second plate body can be formed by using a laser or high-energy electron beam rapid prototyping technology, can be formed by high-temperature sintering, chemical corrosion, electrochemical deposition and other technologies, and can also be formed by precision casting, welding, mechanical cutting or electric discharge machining. Thus, various medical metals can meet the use requirements.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intervertebral fusion device, characterized by comprising the following steps:

the fusion body (10) comprises a first frame (111), a second frame (112) and a plurality of bending plates (12), wherein the bending plates (12) are arranged between the first frame (111) and the second frame (112) at intervals, and a through space (14) which is penetrated up and down is arranged on the fusion body (10);

A first plate body (20) disposed at the upper end of the fusion body (10), the first plate body (20) having a first window (23) communicating with the through space (14);

A second plate body (30) disposed at the lower end of the fusion body (10), the second plate body (30) having a second window (31) communicating with the through space (14);

The through space (14) includes a first through hole (113) provided on the first frame (111), a second through hole (114) provided on the second frame (112), and a third through hole (115) provided between the plurality of curved plates (12);

Each bending plate (12) comprises a first bending section (121) and two second bending sections (122) respectively positioned at two ends of the first bending section (121), one of the two second bending sections (122) is connected with the first frame (111), the other is connected with the second frame (112), and the bending direction of the first bending section (121) is opposite to the bending direction of the second bending section (122);

The fusion body (10) further comprises a first cylinder (131) connected between the first frame (111) and the second frame (112) and a second cylinder (132) connected between the first frame (111) and the second frame (112), and the through space (14) is located between the first cylinder (131) and the second cylinder (132).

2. The interbody fusion cage according to claim 1, wherein the first cylinder (131) includes a left half cylinder (1311) and a right half cylinder (1312), a bending direction of the bending plate (12) of the plurality of bending plates (12) toward the left half cylinder (1311) is the same as a bending direction of the left half cylinder (1311), and a bending direction of the bending plate (12) of the plurality of bending plates (12) toward the right half cylinder (1312) is the same as a bending direction of the right half cylinder (1312).

3. The interbody fusion cage according to claim 1, wherein the first plate body (20) and the second plate body (30) each comprise a plate body (21) and a tooth-shaped portion (22) provided on the plate body (21), the tooth-shaped portion (22) being located on a surface of the plate body (21) remote from the fusion body (10).

4. An intersomatic cage according to claim 3, wherein the tooth profile (22) comprises a plurality of triangular teeth and/or a plurality of trapezoidal teeth and/or a plurality of saw tooth teeth.

5. The intersomatic cage of claim 1, wherein a height of a middle portion of the intersomatic cage is greater than a height of both ends of the intersomatic cage.

6. The intervertebral fusion device of claim 1 further comprising a first chimeric layer (41) formed by an injection molding or die casting process, the first plate (20) being connected to the fusion body (10) by the first chimeric layer (41), the intervertebral fusion device further comprising a second chimeric layer (42) formed by an injection molding or die casting process, the second plate (30) being connected to the fusion body (10) by the second chimeric layer (42).

7. The interbody fusion cage according to claim 1, wherein the first plate (20), the second plate (30), the first frame (111) and the second frame (112) are each arcuate.