CN212089849U - Intervertebral fusion device - Google Patents

Abstract

The utility model provides an interbody fusion cage, including interbody fusion cage body, interbody fusion cage body includes: the first porous plate layer and the second porous plate layer are arranged in an overlapped mode; the third porous plate layer is arranged between the first porous plate layer and the second porous plate layer and comprises a first surface and a second surface which are oppositely arranged, the first surface is connected with the first porous plate layer, and the second surface is connected with the second porous plate layer; wherein, the interbody fusion cage body has the initial condition that is crooked form and is the assembly condition of straight form, and under the default condition, interbody fusion cage body can be followed the assembly condition and is changed to initial condition. The technical scheme of the utility model the intervertebral fusion cage among the correlation technique support the poor and poor problem of fusion effect of having solved effectively.

Description

Intervertebral fusion device

Technical Field

The utility model relates to the field of medical equipment, particularly, relate to an interbody fusion cage.

Background

The Lumbar Posterior decompression intervertebral Fusion is the most commonly used operation method for treating Lumbar common diseases such as Lumbar disc herniation and Lumbar spinal stenosis, and is specifically implemented by three operation methods of Posterior approach Lumbar Interbody Fusion (PLIF), Transforaminal approach Lumbar Interbody Fusion (TLIF), and Minimally invasive approach Lumbar Interbody Fusion (MIS-TLIF) under a Minimally invasive channel.

In recent decades of clinical practice, three surgical methods all achieve good clinical effects. The surgical access and orientation remains a difficulty in prosthetic implantation, and the optimal prosthetic position should be one in which the prosthesis is placed parallel to the coronal plane, the prosthesis is shaped to approximate the contour of the vertebral body, and maximum bone support is achieved. However, in the related art, the intervertebral fusion is regarded as a common method for treating the instability of a vertebral body segment, the intervertebral fusion device is a titanium alloy block which is processed into a hollow shape, but because the titanium alloy cannot grow together with bones, bone grafting needs to be carried out in a hollow structure, so that the inner and outer bones of the fusion device grow together, and further the titanium alloy intervertebral fusion device can be stabilized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an interbody fusion cage to solve interbody fusion cage among the correlation technique and support the not good and poor problem of fusion effect.

In order to achieve the above object, according to an aspect of the present invention, there is provided an interbody fusion cage, including an interbody fusion cage body, the interbody fusion cage body includes: the first porous plate layer and the second porous plate layer are arranged in an overlapped mode; the third porous plate layer is arranged between the first porous plate layer and the second porous plate layer and comprises a first surface and a second surface which are oppositely arranged, the first surface is connected with the first porous plate layer, and the second surface is connected with the second porous plate layer; wherein, interbody fusion cage body has the initial condition that is crooked form and is the assembled state of straight form, interbody fusion cage body is in under the initial condition, the porosity of first porous plate layer is greater than the porosity of third porous plate layer, the porosity of second porous plate layer is greater than the porosity of third porous plate layer, interbody fusion cage body thickness under the initial condition is greater than its thickness under the assembled state, under the preset condition, interbody fusion cage body can be followed the assembled state and is changed to the initial condition.

Further, the third perforated plate layer includes a plurality of plate body units, and a plurality of plate body unit intervals set up, and the length direction on each plate body unit is perpendicular to the length direction on second perforated plate layer, is provided with the connecting portion of connecting two adjacent plate body units in the space between two adjacent plate body units.

Further, connecting portion include the banding structure, and each plate body unit has first end and second end in its length direction, and wherein, when the interbody fusion cage body is in straight form, the distance between the first end of two adjacent plate body units equals with the distance between the second end of two adjacent plate body units, and when the interbody fusion cage body is in crooked form, the distance between two adjacent plate body units reduces by the first end to the second end direction of two adjacent plate body units gradually.

Further, first porous plate layer and second porous plate layer all include a plurality of layer units that the interval set up, and every layer unit is perpendicular to first porous plate layer and plate body unit, and every layer unit includes a plurality of polygon skeletons of interconnect.

Further, the plate body unit comprises a plurality of space triangular structures.

Further, a plurality of adjacent space triangle structures intersect at the same point.

Furthermore, a plurality of connecting rods are arranged between the layer units, and two ends of each connecting rod are respectively connected with corresponding intersection points of the corresponding polygonal frameworks of the two adjacent layer units.

Further, the thickness of the third porous plate layer is larger than the thickness of the first porous plate layer and the thickness of the second porous plate layer, and the side wall of the third porous plate layer is provided with a mounting hole.

Further, the third porous plate layer is deformed by 0.1 mm to 0.4 mm in the stacking direction, and the first and second porous plate layers are deformed by 0.5 mm to 0.9 mm in the stacking direction.

Furthermore, the first porous plate layer, the second porous plate layer and the third porous plate layer are made of TiNi memory alloy.

Use the technical scheme of the utility model, interbody fusion cage body includes first porous plate layer and the second porous plate layer that the superpose set up, and the setting of third porous plate layer is between first porous plate layer and second porous plate layer, and the first surface and the second surface on third porous plate layer are connected in first porous plate layer and second porous plate layer respectively. The first and second porous sheet layers have a porosity greater than the third porous sheet layer. The first and second porous sheet layers are more compressible than the third porous sheet layer. The interbody fusion cage body can be transformed from a bending state into a straight state under a preset condition (such as after temperature reduction), and can be transformed from the straight state into a restoring state into the bending state under another condition (such as after temperature rise). When straight, first porous plate layer, second porous plate layer and third porous plate layer are in the initial condition of straight form, and when crooked state, first porous plate layer, second porous plate layer and third porous plate layer are in crooked assembly state. Before the interbody fusion cage body is implanted, the interbody fusion cage body is in an initial state, and is bent and large in thickness at the moment. And changing the external environment, such as cooling, so that the interbody fusion cage body is converted into an assembly state, which is flat and thin. After being implanted, the interbody fusion cage body is restored to the initial state, is bent at the moment and has larger thickness. The intervertebral fusion device body keeps the initial state unchanged after being implanted, so that the bone structure is effectively supported, and the porous structures of the first porous plate layer, the second porous plate layer and the third porous plate layer are favorable for being fused with the bone structure. After being implanted, the interbody fusion cage body is in a bending state, reaches an ideal placing position and is matched with the bending trend in a vertebral body, and ideal bone support is provided. Therefore, the technical scheme of the application effectively solves the problems of poor supporting effect and poor fusion effect of the intervertebral fusion device in the related art.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 schematic side view of an embodiment of an intervertebral cage according to the invention;

FIG. 2 illustrates a perspective view of the third porous sheet layer of FIG. 1;

fig. 3 shows a perspective view of the intersomatic cage of fig. 1;

figure 4 shows a cross-sectional schematic view of the intersomatic cage of figure 3;

FIG. 5 shows a schematic structural view of the third porous sheet layer of FIG. 2; and

FIG. 6 illustrates a partial cross-sectional view of the third porous sheet layer of FIG. 5.

Wherein the figures include the following reference numerals:

10. a first porous sheet layer; 11. a first surface; 12. a second surface; 20. a second porous sheet layer; 21. a layer unit; 22. a connecting rod; 30. a third porous ply; 31. a plate body unit; 31a, a first end; 31b, a second end; 32. a connecting portion; 33. and (7) installing holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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.

Unless specifically stated 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. 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, in the present embodiment, the intersomatic cage includes an intersomatic cage body including: the first porous ply 10, the second porous ply 20 and the third porous ply 30 are disposed in a stacked manner. The third porous plate layer 30 is arranged between the first porous plate layer 10 and the second porous plate layer 20, the third porous plate layer 30 comprises a first surface 11 and a second surface 12 which are oppositely arranged, the first surface 11 is connected with the first porous plate layer 10, and the second surface 12 is connected with the second porous plate layer 20; wherein, the interbody fusion cage body has the initial condition that is crooked form and is the assembled state of straight form, and the interbody fusion cage body is under the initial condition, and the porosity of first porous plate layer 10 is greater than the porosity of third porous plate layer 30, and the porosity of second porous plate layer 20 is greater than the porosity of third porous plate layer 30, and the thickness that the interbody fusion cage body is under the initial condition is greater than its thickness under the assembled state, and under the predetermined condition, the interbody fusion cage body can be followed the assembled state and is changed to the initial condition.

With the technical solution of the embodiment, the interbody cage body includes a first porous plate layer 10 and a second porous plate layer 20 disposed one above the other, a third porous plate layer 30 is disposed between the first porous plate layer 10 and the second porous plate layer 20, and a first surface 11 and a second surface 12 of the third porous plate layer 30 are connected to the first porous plate layer 10 and the second porous plate layer 20, respectively. The first and second porous plate layers 10 and 20 have a porosity greater than that of the third porous plate layer 30. The first and second porous sheet layers 10 and 20 are more compressible than the third porous sheet layer 30. The interbody fusion cage body can be transformed from a bending state into a straight state under a preset condition (such as after temperature reduction), and can be transformed from the straight state into a restoring state into the bending state under another condition (such as after temperature rise). The first, second, and third porous slabs 10, 20, and 30 are in an initial state of a flat shape when they are flat, and the first, second, and third porous slabs 10, 20, and 30 are in an assembled state of a curved shape when they are curved. Before the interbody fusion cage body is implanted, the interbody fusion cage body is in an initial state, and is bent and large in thickness at the moment. And changing the external environment, such as cooling, so that the interbody fusion cage body is converted into an assembly state, which is flat and thin. After being implanted, the interbody fusion cage body is restored to the initial state, is bent at the moment and has larger thickness. After the intervertebral fusion cage is implanted, the body of the intervertebral fusion cage keeps the initial state unchanged, so that the bone structure is effectively supported, the superior gap filling and inner supporting effects on the upper vertebral column end plate and the lower vertebral column end plate are realized, and the porous structures of the first porous plate layer, the second porous plate layer and the third porous plate layer are favorable for being fused with the bone structure. After implantation, the third porous sheet layer 30 is compressed by a small amount in the stacking direction, and the third porous sheet layer 30 effectively functions as a support. The interbody fusion cage body is in a bending state, reaches an ideal placing position and is matched with the bending trend in a vertebral body, and ideal bone support is provided. Therefore, the technical scheme of the application effectively solves the problems of poor supporting effect and poor fusion effect of the intervertebral fusion device in the related art.

As shown in fig. 1, the vertical direction in fig. 1 is the thickness direction of the intervertebral cage body, and the thickness direction coincides with the stacking direction.

The porosity of the first porous sheet layer 10 refers to a ratio of a pore volume of the first porous sheet layer 10 to a volume of the first porous sheet layer 10; the porosity of the second porous plate layer 20 refers to a ratio of a pore volume of the second porous plate layer 20 to a volume of the second porous plate layer 20; the porosity of the third porous plate layer 30 refers to a ratio of a pore volume of the third porous plate layer 30 to a volume of the third porous plate layer 30.

As shown in fig. 2, 5 and 6, in the present embodiment, the third porous sheet layer 30 includes a plurality of plate body units 31, the plurality of plate body units 31 are arranged at intervals, the length direction L1 of each plate body unit 31 is perpendicular to the length direction L2 of the second porous sheet layer 20, and a connecting portion 32 connecting two adjacent plate body units 31 is provided in a space between two adjacent plate body units 31. The longitudinal direction L1 of the plate body unit 31 is perpendicular to the longitudinal direction L2 of the second cellular board layer, and this arrangement can prevent the third cellular board layer 30 from being compressed in the stacking direction. A plurality of plate body units 31 interval sets up, is provided with connecting portion 32 between the interval, through the distance between the adjacent a plurality of plate body units 31 of the adjustment in the space between the adjacent plate body unit 31 to realize the crooked change of third perforated plate layer 30, and then make the bending effect better, can implant predetermined position and support the bone structure of this interbody fusion cage upper and lower side betterly.

As shown in fig. 6, in the present embodiment, the connecting portion 32 includes a belt-shaped structure, each plate unit 31 has a first end 31a and a second end 31b in a length direction L1, wherein when the intervertebral cage body is in a flat assembled state, a distance between the first ends of two adjacent plate units 31 is equal to a distance between the second ends of two adjacent plate units 31, and when the intervertebral cage body is in a curved initial state, the distance between two adjacent plate units 31 gradually decreases from the first ends to the second ends of two adjacent plate units 31. The strip structure can connect adjacent plate units 31, and can better bend the third cellular board layer 30. The spaced plate units 31 enable the third porous plate layer 30 to be bent while securing structural strength. Moreover, the intervertebral fusion cage is manufactured integrally by 3D printing.

As shown in fig. 3 and 4, in the present embodiment, each of the first and second porous sheet layers 10 and 20 includes a plurality of layer units 21 arranged at intervals, each layer unit 21 is perpendicular to the first porous sheet layer 10 and the plate body unit 31, and each layer unit 21 includes a plurality of polygonal skeletons connected to each other. The polygon skeleton is yielding structure, and layer unit 21 includes a plurality of polygon skeletons, and layer unit 21 is perpendicular with first porous sheet layer 10 and plate body unit 31, and this setting makes layer unit 21 be easily out of shape more in the direction of the first porous sheet layer 10 of perpendicular to, and then can be better with bone structure mutual adaptation to can with the better integration of bone structure. Two adjacent polygonal skeletons have a common edge, and this arrangement increases the connection tightness of the layer unit 21. Making the layer unit 21 less prone to scattering and damage. In the present embodiment, the polygonal skeleton has a hexagonal structure.

In the embodiment not shown in the figures, the layer unit may further include a circular structure, a quadrilateral structure, a pentagonal structure, and the like, and the effects are similar to the above effects, and are not described herein again.

As shown in fig. 4, in the present embodiment, the plate body unit 31 includes a plurality of spatial triangular structures. The triangle structure is stable and not easy to deform.

As shown in fig. 4, in the present embodiment, a plurality of adjacent space triangle structures intersect at the same point. The spatial triangle structure refers to that a plurality of triangles share the same vertex, and the spatial triangle is divergently arranged. The structure of the plate body unit 31 is more stable and the amount of deformation is smaller.

As shown in fig. 3 and 4, in the present embodiment, a plurality of tie bars 22 are provided between the layer units 21, and both ends of each tie bar 22 are connected to the corresponding intersections of the corresponding polygonal-structured frameworks of the two adjacent layer units 21. The tie bars 22 connect the adjacent two layer units 21, the tie bars 22 are perpendicular to the layer units 21, and the corresponding intersection points of the corresponding polygonal-structured frameworks in the plurality of layer units 21 are maintained on the same straight line. This arrangement makes it possible to accomplish the connection of the plurality of layer units 21 by only providing one connecting rod 22, simply and efficiently.

In the embodiment not shown in the figures, the layer units are arranged in a staggered manner, in which case the connecting rods can also be arranged in a bent or curved manner to connect a plurality of layer units.

As shown in fig. 1 and 5, in the present embodiment, the thickness of the third porous plate layer 30 is greater than the thickness of the first porous plate layer 10 and the thickness of the second porous plate layer 20. The side wall of the third porous plate layer 30 is provided with a mounting hole 33. The third porous plate layer 30 has a larger thickness, so that the structure thereof is more stable and basically does not change, thereby maintaining the overall rigidity and strength of the interbody fusion cage. When being stressed, the first porous plate layer 10 and the second porous plate layer 20 can be deformed to adapt to the bone structure shape, thereby enabling the supporting effect to be better. The thickness ratio of the first porous plate layer 10, the second porous plate layer 20, and the third porous plate layer 30 is 1:1:2 in this embodiment.

In an embodiment not shown in the figures, the first, second, and third porous sheet layers have a thickness ratio of 1:1: 1.

The third porous ply 30 is deformed by 0.1 mm to 0.4 mm in the stacking direction, and the first and second porous plies 10 and 20 are deformed by 0.5 mm to 0.9 mm in the stacking direction.

As shown in fig. 1 and 3, in the present embodiment, the thickness of the interbody cage body is 10 mm, the amount of deformation of the third porous plate layer 30 in the stacking direction is 0.2 mm, and the amount of deformation of the first and second porous plate layers 10 and 20 in the stacking direction is 0.8 mm. At the moment, the deformation effect can be well adapted to the shape of the bone structure, and then the supporting effect of the interbody fusion cage is ensured.

As shown in fig. 1, in the present embodiment, the first porous plate layer 10, the second porous plate layer 20, and the third porous plate layer 30 are made of a memory alloy. The memory alloy has large bending amount, high plasticity and super elasticity. And the shape can change with changes in temperature. After the intervertebral fusion cage is implanted, the memory alloy can keep a fixed shape, so that the supporting effect is better.

The amount of deformation recovery is related to two factors: 1) the deformation of the memory alloy, 2) whether the structural design is easy to provide a barrier to the deformation of the memory alloy, for example, the triangular support structure does not easily exert the deformation capability of the memory alloy, but the parallelogram and regular hexagon structures are relatively easy. The embodiment fully analyzes the characteristics of the two. The utility model discloses two-layer deflection is big about the expectation, can play like this before the implantation and in-process interbody fusion cage height low, and implants the back interbody fusion cage and resume the design height, highly promotes the realization to the superior gap filling of upper and lower backbone end plate and support the effect in with. The device can open narrow intervertebral space by self height, recover the tension of loose soft tissues such as fibrous ring, ligament, joint capsule and the like, and simultaneously obtain a good pore structure for facilitating the bone cells to grow in, because the bone cells have growing orientation to the pores with certain sizes. That is, a pore structure of a certain size is liable to cause bone ingrowth, i.e., osseointegration. While the third porous plate layer 30 is not expected to deform too much, the human spine is a stressed environment, and the relatively strong resistance of the third porous plate layer 30 to deformation may actually ensure a minimum thickness of the implant without the strength and stiffness being uncontrollable to cause the implant to compress.

Preferably, the interbody fusion cage body of this embodiment is made of a TINI memory alloy (nickel-titanium memory alloy) through a 3D printing technology, and the TINI memory alloy (nickel-titanium memory alloy) can automatically restore its plastic deformation to an original shape at a certain temperature. The intervertebral cage of the present embodiment is curved in an initial state, is plastically deformed in a flat assembled state and reduced in thickness under a low temperature condition, and is restored (curved and increased in thickness) to the initial state under the memory capacity of the TINI memory alloy (nitinol) when the temperature is increased to a predetermined temperature after being implanted in a patient, so that it is close to a desired shape and provides sufficient bone support. When the intervertebral fusion cage is implanted, the intervertebral fusion cage body enters between the two vertebral bodies with smaller thickness and expands after being implanted, so that the intervertebral fusion cage better fits the surfaces of the upper vertebral body and the lower vertebral body.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, 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 simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted 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 if not stated otherwise, the terms have no special meaning, 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 (10)

1. An intersomatic cage comprising an intersomatic cage body, the intersomatic cage body comprising:

a first porous plate layer (10) and a second porous plate layer (20) which are arranged in an overlapping manner;

a third porous sheet layer (30) disposed between the first porous sheet layer (10) and the second porous sheet layer (20), the third porous sheet layer (30) including a first surface (11) and a second surface (12) disposed opposite each other, the first surface (11) being connected to the first porous sheet layer (10), the second surface (12) being connected to the second porous sheet layer (20);

the interbody fusion cage body has an initial state which is curved and an assembly state which is straight, the interbody fusion cage body is in the initial state, the porosity of the first porous plate layer (10) is greater than the porosity of the third porous plate layer (30), the porosity of the second porous plate layer (20) is greater than the porosity of the third porous plate layer (30), the thickness of the interbody fusion cage body in the initial state is greater than the thickness of the interbody fusion cage body in the assembly state, and the interbody fusion cage body can be changed from the assembly state to the initial state under a preset condition.

2. The intersomatic cage according to claim 1, wherein the third porous plate layer (30) comprises a plurality of plate units (31), the plate units (31) being arranged at intervals, a length direction (L1) of each plate unit (31) being perpendicular to a length direction (L2) of the second porous plate layer (20), and a connecting portion (32) connecting two adjacent plate units (31) being provided in a space between two adjacent plate units (31).

3. The intersomatic cage according to claim 2, wherein the connecting portion (32) comprises a band-like structure, each plate unit (31) having a first end (31a) and a second end (31b) in a longitudinal direction (L1), wherein the distance between the first ends of two adjacent plate units (31) is equal to the distance between the second ends of two adjacent plate units (31) when the intersomatic cage body is in the flat state, and wherein the distance between two adjacent plate units (31) is gradually decreased from the first ends to the second ends of two adjacent plate units (31) when the intersomatic cage body is in the curved state.

4. Intersomatic cage according to claim 2, characterized in that the first and second porous plate layers (10, 20) each comprise a plurality of layer units (21) arranged at intervals, each layer unit (21) being perpendicular to the first porous plate layer (10) and the plate body unit (31), each layer unit (21) comprising a plurality of polygonal skeletons connected to each other.

5. Intervertebral cage according to claim 2, characterized in that the plate unit (31) comprises a plurality of spatial triangular structures.

6. An intersomatic cage according to claim 5, characterized in that adjacent pluralities of the spatial triangular structures intersect at the same point.

7. An intersomatic cage according to claim 4, characterized in that a plurality of connecting rods (22) are provided between the layer units (21), the connecting rods (22) having their two ends connected to respective intersections of the respective polygonal skeletons of two adjacent layer units (21).

8. Intersomatic cage according to claim 2, characterized in that the thickness of the third porous plate layer (30) is greater than the thickness of the first porous plate layer (10) and the thickness of the second porous plate layer (20), the lateral walls of the third porous plate layer (30) being provided with mounting holes (33).

9. Intersomatic cage according to claim 1, characterized in that the deformation of the third porous plate layer (30) in the stacking direction is between 0.1 and 0.4 mm and the deformation of the first and second porous plate layers (10, 20) in the stacking direction is between 0.5 and 0.9 mm.

10. Intersomatic cage according to claim 1, characterized in that the first, second and third porous plate layers (10, 20, 30) are made of TiNi memory alloy.

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