CN112494183A

CN112494183A - Intervertebral fusion device

Info

Publication number: CN112494183A
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: 2021-03-16
Anticipated expiration: 2040-11-30
Also published as: CN112494183B

Abstract

The present invention provides an intervertebral cage comprising: the fusion body comprises a first frame, a second frame and a plurality of bending plates, the bending plates are arranged between the first frame and the second frame at intervals, and a through space which is communicated up and down is arranged on 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 provided with a second window communicated with the through space. The technical scheme of the application effectively solves the problem that the postoperative fusion cage prosthesis in the related technology sinks to cause complications.

Description

Intervertebral fusion device

Technical Field

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

Background

Intervertebral disc degeneration is a common orthopedic disease, and the treatment of intervertebral disc degeneration by intervertebral fusion operation implemented in modern medicine is quite mature, but in some cases, because the 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 titanium alloy material or PEEK material, or made of titanium alloy material by adopting 3D printing technology.

Lumbar interbody fusion is one of the methods for treating spinal diseases, and an increasing number of people receive interbody fusion treatment every year. Usually, the rigidity of the fusion device prosthesis is far higher than that of the human body vertebral body skeleton, and the fusion device prosthesis is sunk after the operation, so that complications are caused.

Disclosure of Invention

The invention mainly aims to provide an intervertebral fusion cage to solve the problem that the postoperative fusion cage prosthesis in the related art is sunk to cause complications.

In order to achieve the above object, the present invention provides an intervertebral cage comprising: the fusion body comprises a first frame, a second frame and a plurality of bending plates, the bending plates are arranged between the first frame and the second frame at intervals, and a through space which is communicated up and down is arranged on 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 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 bent plates.

Further, each of the curved plates includes a first curved section and two second curved sections respectively located at both ends of the first curved section, one of the two second curved sections is connected with the first frame, and the other is connected with the second frame, and the curved direction of the first curved section is opposite to the curved direction of the second curved 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 being located between the first cylinder and the second cylinder, an axis of the first cylinder being parallel to or inclined from an axis of each of the bent plates, and an axis of the second cylinder being parallel to or inclined from an axis of each of the bent plates.

Further, the first cylinder comprises a left half cylinder and a right half cylinder, the bending direction of the bending plate towards the left half cylinder in the plurality of bending plates is the same as the bending direction of the left half cylinder, and the bending direction of the bending plate towards the right half cylinder in the plurality of bending plates is the same as the bending direction of the right half cylinder.

Further, first plate body and second plate body all include the plate body and set up the profile of tooth portion on the plate body, and profile of tooth portion lies in the plate body and keeps away from the surface that fuses the body.

Further, the tooth-shaped portion 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 both ends of the intersomatic cage.

Furthermore, 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.

Furthermore, 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 invention, the intervertebral fusion cage comprises: fuse body, first plate body and second plate body. The fusion body includes a first frame, a second frame, and a plurality of curved plates. A plurality of curved plates are disposed at intervals between the first frame and the second frame. The fusion body is provided with a through space which is communicated up and down. The first plate body is arranged at the upper end of the fusion body, and the first plate body 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 lumbar intervertebral disc which needs to be replaced between the lumbar vertebral bodies of the two adjacent sections is taken out, a movable gap is formed between the lumbar vertebral bodies of the two adjacent sections, the intervertebral fusion device is implanted into the movable gap, the first plate body is connected with the lumbar vertebral body of the section above, and the second plate body is connected with the lumbar vertebral body or the sacrum of the section below. Because it can fix and support first plate body and second plate body to fuse the body and be located between first plate body and the second plate body, under the first plate body and second plate body respectively to fusing the body application of force condition, a plurality of crooked boards receive the effort and can produce elastic deformation, make the elastic motion of first plate body and second plate body in certain controllable within range. First plate body and the lumbar vertebrae centrum direct contact of a section of top, the lumbar vertebrae centrum direct contact of a section of second plate body and below, first frame and second frame carry out the cladding with a plurality of crooked boards, under the effect that a plurality of crooked boards effectively supported, make first frame support first plate body and second frame effectively and support the second plate body effectively, make interbody fusion cage have good mechanical stability, make interbody fusion cage realize good supporting role, and then make interbody fusion cage carry out good support to the backbone centrum. Wherein, a plurality of crooked board sets up at interval and can form hollow out construction, the elastic modulus and the weight of reduction interbody fusion cage that can be very big for interbody fusion cage's rigidity is less than or equal to human self centrum skeleton's rigidity. Thus, the interbody fusion cage can greatly reduce the rigidity of the fusion cage prosthesis in the related art, and avoid the subsidence of the interbody fusion cage after the operation. Meanwhile, the granular bone is filled into the through space through the gap between the adjacent bent plates, and the slow release medicine with viscosity is placed in the gap between the adjacent bent plates and is positioned at the outer side of the granular bone. The particle bone can be contacted with the lumbar vertebra body of one section above through the first window, the particle bone can be contacted with the lumbar vertebra body or the sacrum of one section below through the second window, and the penetrating structure is formed around the plurality of bending plates, so that the soft tissue adhesion and the blood circulation are facilitated, and meanwhile, a good nutrition 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 that the postoperative fusion device prosthesis in the related art is sunk to cause complications.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a perspective view of an embodiment of an intervertebral cage according to the invention;

fig. 2 shows a perspective schematic view of the intervertebral cage of fig. 1 implanted between two adjacent lumbar vertebral bodies;

figure 3 shows a front view of the intervertebral cage of figure 1;

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

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

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

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

Wherein the figures include the following reference numerals:

1. lumbar vertebral body; 2. lumbar intervertebral discs; 3. an intervertebral cage; 10. fusing the ontology; 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 body; 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 plate body; 22. a tooth-shaped portion; 23. a first window; 30. a second plate body; 31. a second window; 41. a first fitting layer; 42. a second fitting layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1 to 6, the intervertebral cage of the present embodiment includes: a fused 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 bent plates 12 are disposed at intervals between the first frame 111 and the second frame 112. The fusion body 10 is provided with a through space 14 which penetrates vertically. A first plate 20 is provided at the upper end of the fusion body 10, the first plate 20 having 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 needs to be replaced between the lumbar vertebral bodies 1 of two adjacent segments is taken out, a movable gap is formed between the lumbar vertebral bodies 1 of the two adjacent segments, the intervertebral fusion device 3 is implanted into the movable gap, the first plate body 20 is connected with the lumbar vertebral body 1 of one segment above, and the second plate body 30 is connected with the lumbar vertebral body 1 or sacrum of one segment 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 under the action of the action force, so that the first plate body 20 and the second plate body 30 can elastically move within a certain controllable range. First plate body 20 and the lumbar vertebrae centrum 1 direct contact of a section of top, second plate body 30 and the lumbar vertebrae centrum 1 direct contact of a section of below, first frame 111 and second frame 112 carry out the cladding with a plurality of crooked boards 12, under the effect that a plurality of crooked boards 12 effectively supported, make first frame 111 support first plate body 20 and second frame 112 effectively and support the second plate body, make interbody fusion cage have good mechanical stability, make interbody fusion cage realize good supporting role, and then make interbody fusion cage carry out good support to the backbone centrum. Wherein, a plurality of crooked boards 12 set up at interval and can form hollow out construction, the elastic modulus and the weight that reduce interbody fusion cage that can be very big for interbody fusion cage's rigidity is less than or equal to human self centrum skeleton's rigidity. Thus, the interbody fusion cage of the embodiment can greatly reduce the rigidity of the fusion cage prosthesis in the related art, and avoid the subsidence of the interbody fusion cage after the operation. While the granular bone is filled into the through space 14 through the gap between the adjacent bent plates 12, a slow drug release agent having stickiness is placed in the gap between the adjacent bent plates 12 and outside the granular bone. The granular bone can be contacted with the lumbar vertebral body 1 of the upper section through the first window 23, the granular bone can be contacted with the lumbar vertebral body 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 the soft tissue attachment and the blood circulation can be conveniently formed, and meanwhile, 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 that the postoperative fusion device prosthesis in the related art is sunk to cause complications.

In this embodiment, the first frame 111 and the second frame 112 are both truss structures, which can provide the intervertebral fusion device with good stability and overall rigidity. Each curved plate 12 is C-shaped in configuration to facilitate height-wise compression and adjustment of the cage.

As shown in fig. 1, 7 and 9, in order to achieve good blood supply and attachment of soft tissue, the penetrating space 14 includes a first through hole 113 provided in the first frame 111, a second through hole 114 provided in the second frame 112, and a third through hole 115 provided between the plurality of bent plates 12. In this way, the first through hole 113, the second through hole 114 and the third through hole 115 allow blood to flow more smoothly, which is beneficial to promote the bone particles in the through space 14 to achieve faster bony fusion with the adjacent two segments of the lumbar vertebral body 1.

As shown in fig. 3 and 6, in order to provide each of the bent plates 12 with sufficient structural strength, each of the bent plates 12 includes a first bent section 121 and two second bent sections 122 respectively located at both ends of the first bent section 121. One of the two second bending 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 provides each curved plate 12 with a high structural strength. Meanwhile, in the case where the first plate body 20 and the second plate body 30 apply forces to the fusion body 10, respectively, when the first plate body 20 applies an acting force to the first frame 111 and, at the same time, when the second plate body 30 applies an acting force to the second frame 112, the first frame 111 and the second frame 112 apply a force to the curved plate 12 together greater than the elastic force of the curved plate 12, and the plurality of curved plates 12 can achieve plastic shrinkage. When the second board body 30 applies a force to the second frame 112 and, at the same time, when the second board 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 curved plate 12 that is less than the elastic force of the curved plate 12, and the plurality of curved plates 12 can achieve plastic springback. Thereby reducing the modulus of elasticity of the overall intervertebral cage.

In the present embodiment, the first plate 20 and the second plate 30 are each preferably a bone-like trabecular structure. In this way, the first plate body 20 and the second plate body 30 each have a plurality of mesh cells therein, and the fulcrum of each mesh cell is combined with the fulcrum of an adjacent cell. The pores of the bone-like trabecular structure are between 300um and 500 um. The first plate body 20 and the second plate body 30 are designed in an anatomical form and conform to the anatomical form of a human body. More preferably, the first plate 20 and the second plate 30 are each of a 3D trabecular metal structure.

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 is parallel to the axis of each curved plate 12, and the axis of the second cylinder 132 is parallel to the axis of each curved plate 12. The first barrel 131 and the second barrel 132 can form a channel, so that the particulate bone and the slow release medicine can be conveniently filled into the intervertebral fusion device. Specifically, the granular bone is filled into the through space 14 through the first cylinder 131, and the slow release drug with viscosity is placed in the first cylinder 131 and the second cylinder 132, so that fusion of various effects is easily realized, and a better postoperative curative effect is realized. In this way, slow release through the particulate bone and placement in the space between adjacent two of the curved plates 12 is facilitated. The sustained release drug is preferably BMP (bone morphogenetic protein) and/or an anti-inflammatory drug. In the present embodiment, the diameters of the inner bores of the first cylinder 131 and the second cylinder 132 are preferably 4 mm.

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

As shown in fig. 3 and 6, the first cylinder 131 includes a left cylinder half 1311 and a right cylinder half 1312. The bending direction of the bending plate 12 facing the left half cylinder 1311 among the plurality of bending plates 12 is the same as the bending direction of the left half cylinder 1311, and the bending direction of the bending plate 12 facing the right half cylinder 1312 among the plurality of bending plates 12 is the same as the bending direction of the right half cylinder 1312. In this way, the plurality of curved plates 12 are both osseointegrated with the first frame 111 and provide good axial compression stiffness, thereby allowing the interbody cage to be height adjustable.

As shown in fig. 1 and 3, in order to achieve better friction and initial stability between the first plate 20 and the upper section of the lumbar vertebral body 1 and better friction and initial stability between the second plate 30 and the lower section of the lumbar vertebral body 1, the first plate 20 and the second plate 30 each include a plate body 21 and a tooth-shaped portion 22 disposed on the plate body 21, and the tooth-shaped portion 22 is located on the surface of the plate body 21 away from the fusion body 10. Thus, the surface of the first plate 20 away from the fusion body 10 and the surface of the second plate 30 away from the fusion body 10 can be formed with rough surfaces, which can be embedded and combined with the upper and lower lumbar vertebrae 1, to provide an initial stabilization function to the implanted intervertebral fusion cage 3 to support the upper and lower lumbar vertebrae 1. Therefore, in the rehabilitation process of the patient, osteocytes and micro blood vessels grow in along the micropores of the bone-like trabecular structure in a creeping way, and finally the fusion embedded type intervertebral fusion device with activity is formed. In the present 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 between the first plate 20 and the second plate 30, good early stability is achieved. The toothed portion 22 includes a plurality of serrated teeth, thus increasing 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 serrated teeth can form a wave structure.

Of course, in other embodiments not shown in the figures, the toothed portion comprises 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 height of the middle portion of the intersomatic cage is greater than the height of both ends of the intersomatic cage. Therefore, the structure of the interbody fusion cage is convenient to implant between the lumbar vertebra bodies 1 of the two adjacent segments, the interbody fusion cage is not easy to fall off after being implanted, the damage to the spine is small, and the distraction of the lumbar vertebra bodies 1 of the two adjacent segments can be completed only by implanting a single interbody fusion cage.

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

Of course, in other embodiments not shown in the figures, the intervertebral cage further includes forming the first chimeric layer by a die casting process. The intervertebral cage further includes a second tabling 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. Like this, after intervertebral fusion ware 3 is implanted between the lumbar vertebrae centrum 1 of two adjacent sections, the first plate body 20 of arc form and the second plate body 30 of arc form can with the physiological bone structure gomphosis of periphery and can carry out the osseointegration, and then reach the long-term purpose that stably supports.

As shown in fig. 1, 6 and 7, in order to realize 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 segments 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 connection segments 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. Thus, 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 shape of the first plate body 20 and the second plate body 30 is convenient for adopting a side approach implantation method, the side approach implantation method is convenient for implanting between the lumbar vertebral bodies 1 of two adjacent segments, and the function of expanding the lumbar vertebral bodies 1 of two adjacent segments can be completed, so that the operation is simple.

As shown in fig. 8, the overall shape of the fusion body 10 in plan view is rectangular. In this embodiment, the sizes 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 the intervertebral fusion cage 3 with multiple anatomical dimensions, and ensure that the surrounding tissues in contact with the intervertebral fusion cage 3 maintain the original position state, so that the fusion surface on the outer side of the intervertebral fusion cage is well matched with the physiological articular surface of the adjacent vertebral body.

The first board body 20 and the second board body 30 of the present embodiment are manufactured using a 3D printing process. Fuse body 10 and adopt making of PEEK material, the first plate body 20 and the second plate body 30 that 3D printed are by the bone fusion effect of the realization postoperative that titanium alloy class bone trabecula can be better, fuse body 10 that the PEEK material was made can alleviate intervertebral fusion ware's whole weight.

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 metals, magnesium alloys, and peek materials.

Of course, the fusion body, the first plate body and the second plate body can be formed by using laser or high-energy electron beam rapid prototyping technology, can also 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 electrical discharge machining. Thus, various medical metals can meet the use requirements.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship 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 of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement 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 cage, comprising:

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

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

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

2. Intervertebral cage according to claim 1, characterized in that the through space (14) comprises 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 curved plates (12).

3. Intervertebral cage according to claim 2, characterized in that each of the curved plates (12) comprises a first curved segment (121) and two second curved segments (122) located at the two ends of the first curved segment (121), respectively, one of the two second curved segments (122) being connected to the first frame (111) and the other being connected to the second frame (112), the direction of curvature of the first curved segment (121) being opposite to the direction of curvature of the second curved segment (122).

4. Intervertebral cage according to claim 1, characterized in that 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), the through space (14) being located between the first cylinder (131) and the second cylinder (132), the axis of the first cylinder (13) being parallel or inclined to the axis of each of the curved plates (12) and the axis of the second cylinder (132) being parallel or inclined to the axis of each of the curved plates (12).

5. Intervertebral cage according to claim 4, characterized in that the first cylinder (131) comprises a left half cylinder (1311) and a right half cylinder (1312), the bending plate (12) of the plurality of bending plates (12) facing the left half cylinder (1311) having the same bending direction as the left half cylinder (1311), the bending plate (12) of the plurality of bending plates (12) facing the right half cylinder (1312) having the same bending direction as the right half cylinder (1312).

6. Intervertebral cage according to claim 1, characterized in that the first plate (20) and the second plate (30) each comprise a plate body (21) and a toothed portion (22) provided on the plate body (21), the toothed portion (22) being located on the surface of the plate body (21) remote from the fusion body (10).

7. Intervertebral cage according to claim 6, characterized in that the toothing (22) comprises a plurality of triangular teeth and/or a plurality of trapezoidal teeth and/or a plurality of saw-tooth teeth.

8. An intersomatic cage according to claim 1, characterized in that the height of the intermediate portion of the intersomatic cage is greater than the height of the two ends of the intersomatic cage.

9. The intersomatic cage according to claim 1, further comprising a first fitting layer (41) formed by an injection or die-casting process, the first plate body (20) and the fusion body (10) being connected by the first fitting layer (41), and a second fitting layer (42) formed by an injection or die-casting process, the second plate body (30) and the fusion body (10) being connected by the second fitting layer (42).

10. The intersomatic cage according to claim 1, characterized in that the first plate (20), the second plate (30), the first frame (111) and the second frame (112) are all arc-shaped.