CN108670507A - adaptive intervertebral fusion - Google Patents

Abstract

The present disclosure relates to an adaptive intervertebral cage, comprising: a main body portion having a flat shape; and a support portion formed on the main body portion and having a plurality of support columns formed obliquely on the main body portion. In this case, after the intersomatic cage is implanted between the human body such as vertebrae, the supporting part is in direct contact with the vertebrae to receive pressure from the vertebrae, and since the supporting part has a plurality of struts formed obliquely on the body part, the supporting part is easily adaptively stressed according to the surfaces of the vertebrae in contact with the intersomatic cage, thereby improving the clinical prosthetic effect of the intersomatic cage. In addition, since the intervertebral cage can stimulate the fusion surface of the vertebrae more uniformly, it has good bone induction property and can promote the bone to recover and grow.

Description

adaptive intervertebral fusion

technical field

The present disclosure relates to an adaptive intervertebral fusion cage.

Background technique

With the intensification of population aging and the change of living habits of modern urban people, spinal degenerative diseases represented by cervical spondylosis, cervical disc herniation, lumbar disc herniation, lumbar spinal stenosis, etc. are seriously affecting people's work and life . At present, when the above-mentioned diseases are in the initial stage, conservative treatment methods such as drug treatment and physical therapy are mostly adopted. However, with the aggravation of the patient's condition, more effective treatment methods such as vertebral fusion should be considered to prevent the aggravation of the patient's condition. Take lumbar disc herniation as an example. When the disc herniation compresses more than 1/3 of the spinal canal or the lower limbs suffer from numbness, difficulty moving, and inability to defecate, the effect of conservative treatment is not obvious. At this time, it is necessary to consider Perform vertebral fusion on the patient.

In spondylolisthesis, the herniated intervertebral disc between the vertebrae is removed, and then an intervertebral fusion cage is implanted between the vertebrae to induce the fusion of the vertebrae, so as to achieve the purpose of eliminating the lesion. In the clinical application of vertebral fusion, because the intervertebral fusion device is placed in the human body for a long time after the operation, the structure, manufacturing technology, quality and other factors of the intervertebral fusion device play an important role in the postoperative effect of vertebral fusion. effect.

Patent Document 1 discloses a shapeable individualized spinal fusion cage, which includes an upper top plate, a lower top plate, a plastic spring, an inner biosilica gel ring, an outer biosilica gel ring, buckle A and buckle B of the fusion cage. The upper top plate and the lower top plate are connected together by a return spring, the inner bio-silicone ring and the outer bio-silica gel ring are distributed on the inner and outer sides of the return spring, and are connected to the upper and lower top plates through buckle A and buckle B, and the outer There is a bone cement injection hole on the biosilicone ring.

However, in the above-mentioned Patent Document 1, although the fusion cage can be adjusted in height, angle, inclination, etc., the shape of the upper top plate and the lower top plate of the fusion cage is fixed, and there are individual differences between each surgical individual. Yes, the surface in contact with human bones cannot be completely fitted. Therefore, the fusion device of Patent Document 1 is not conducive to the fusion effect between vertebrae.

prior art literature

Patent Document 1: Chinese Patent Application Publication No. CN104083235A.

Contents of the invention

The present disclosure is made in view of the above-mentioned state of the prior art, and its purpose is to provide an intervertebral fusion device that can adapt to the shape of different intervertebral bones, increase its osteoinductivity, and promote bone growth.

To this end, the present disclosure provides an adaptive intervertebral fusion cage, which includes: a main body part in a flat shape; and a support part formed on the main body part and having an obliquely formed Multiple pillars.

In this case, after the intervertebral fusion device is implanted in the human body such as between vertebrae, the supporting part is in direct contact with the vertebrae to bear the pressure from the vertebrae. The internal part is easy to be adaptively stressed according to the contact surface of the vertebra and the intervertebral cage, thereby improving the clinical repair effect of the intervertebral cage. In addition, because the intervertebral cage can stimulate the fusion surface of the vertebrae more uniformly, it has good osteoinductivity and can promote bone recovery and growth.

In addition, in the intervertebral fusion device of the present disclosure, optionally, the plurality of struts further include at least a first type of strut with a first inclination angle and a second type of strut with a second inclination angle, the The first type of pillar forms an included angle with the second type of pillar. In this case, the first-type pillars and the second-type pillars of the supporting part can well withstand the pressure from the vertebrae, thereby improving the stress-bearing condition of the vertebrae and avoiding secondary damage to the vertebrae.

In addition, in the intervertebral fusion device of the present disclosure, optionally, the struts of the first type of struts and the respective struts of the second type of struts respectively have a common base end. Therefore, the supporting part 20 can bear the stress from the vertebrae from multiple different directions, thereby further improving the stress state of the vertebrae. .

In addition, in the intervertebral fusion device according to the present disclosure, optionally, the main body part further has a mesh structure, and the first type of struts and the second type of struts obliquely protrude from the mesh structure. . In this case, the main body part with mesh structure is good for blood exchange and bone growth.

In addition, in the intervertebral fusion device of the present disclosure, optionally, the plurality of struts further include a third type of strut having a different inclination direction from the first type of strut and the second type of strut. Thus, through the three types of pillars in different directions, the stress of the intervertebral cage can be more uniform.

In addition, in the intervertebral fusion device according to the present disclosure, optionally, the main body part and the support part are integrally formed. Thereby, the structural stability of the intervertebral cage can be increased.

In addition, in the intervertebral fusion device of the present disclosure, optionally, the main body is also filled with artificial bone. Thereby, bone growth can be induced and recovery can be promoted.

In addition, in the intervertebral fusion device of the present disclosure, optionally, the support part further includes a buffer part provided at the end of the pillar. In this case, since the buffer part is in direct contact with the vertebrae, it can buffer the force directly received between the intervertebral cage and the vertebrae.

In addition, in the intervertebral fusion device of the present disclosure, optionally, the buffer portion is at least one of a flat plate shape, a spherical shape, and an elliptical spherical shape. Thereby, different buffer shapes can be selected according to different vertebral conditions.

In addition, in the intervertebral fusion device involved in the present disclosure, optionally, the intervertebral fusion device is made by 3D printing. Thus, an intervertebral fusion cage with a complex strut structure can be fabricated using 3D printing technology.

In addition, in the intervertebral fusion device according to the present disclosure, optionally, the main body part further has a plurality of through holes penetrating up and down. Thereby, an air and blood passage can be formed in the intervertebral fusion device, and bone growth and recovery can be promoted.

In addition, in the intervertebral fusion device of the present disclosure, optionally, the artificial bone includes bioceramic particles and degradable polyester materials. In this case, the artificial bone can be degraded after promoting bone growth, forming a Qi and blood passage in the main body and the supporting part, which is beneficial to the growth and recovery of the bone.

In addition, in the intervertebral fusion device according to the present disclosure, optionally, the artificial bone is combined with the main body part by thermal compression. As a result, the artificial bone and the intervertebral cage can be firmly coupled.

In addition, in the intervertebral fusion device of the present disclosure, optionally, the through hole is in the shape of a regular hexagonal prism. Thereby, the through-hole can be enlarged as much as possible while maintaining stability.

According to the present invention, an intervertebral fusion device that can adapt to the shape of different intervertebral bones, increase its osteoinductivity, and promote bone growth can be provided.

Description of drawings

Embodiments of the present disclosure will now be explained in further detail by way of example only with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view showing a state of use of an intervertebral fusion device according to a first embodiment of the present disclosure.

Fig. 2 is a perspective view showing the intervertebral fusion cage according to the first embodiment of the present disclosure.

Fig. 3 is a cross-sectional view showing the intervertebral fusion cage in Fig. 2 along the section line AA'.

Fig. 4 is a schematic diagram showing the mesh structure of the main body of the intervertebral cage.

Fig. 5 is a side view showing the intervertebral cage.

FIG. 6 is a partially enlarged view showing a side view of the intervertebral cage shown in FIG. 5 .

FIG. 7 is a schematic top view showing three pillars of FIG. 6 .

Fig. 8 is a perspective view showing an intervertebral fusion cage according to a second embodiment of the present disclosure.

9 is a schematic perspective view showing a modified example of the main body of the intervertebral cage according to the second embodiment of the present disclosure.

Detailed ways

All references cited in this disclosure are incorporated by reference in their entirety as if fully set forth. Unless defined otherwise, technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. A general guide to many of the terms used in this application is provided to those skilled in the art. Those skilled in the art will recognize many methods and materials similar or equivalent to those described in the present disclosure, which could be used in the practice of the present disclosure. Indeed, the present disclosure is in no way limited to the methods and materials described.

(first embodiment)

FIG. 1 is a schematic view showing a state of use of an intervertebral fusion cage 1 according to a first embodiment of the present disclosure. FIG. 2 is a perspective view showing the intervertebral fusion cage 1 according to the first embodiment of the present disclosure. Fig. 3 is a sectional view showing the intervertebral cage according to the first embodiment of the present disclosure along the section line AA'.

As shown in FIGS. 1 and 2 , a first embodiment of the present disclosure relates to an adaptive intervertebral fusion cage 1 (also sometimes referred to as "intervertebral fusion cage 1"). In this embodiment, the intervertebral cage 1 includes a support part 20 and a main body part 10 . In the intervertebral cage 1 according to the present embodiment, the main body 10 has a flat shape, and the support part 20 is formed on the main body 10 and has a plurality of struts formed obliquely on the main body 10 .

As shown in Figure 1, after the intervertebral fusion device 1 is implanted into the human body such as between the vertebrae 2, the support part 20 is in direct contact with the vertebrae and bears the pressure from the vertebrae. Therefore, the supporting part 20 is easy to be adaptively stressed according to the contact surface of the vertebra and the intervertebral fusion device 1 , thereby improving the clinical repair effect of the intervertebral fusion device 1 . In addition, since the intervertebral fusion device 1 can stimulate the fusion surface of the vertebrae more uniformly, it has good osteoinductivity and can promote bone recovery and growth.

In some examples, in the intervertebral fusion cage 1 , the support part 20 can be provided on the upper and lower surfaces of the main body part 10 at the same time (see FIG. 3 ). For example, the support portion 20 may be symmetrically provided with a support portion 20 a and a support portion 20 b with respect to the main body portion 10 (see FIG. 5 described later). In this case, the supporting part 20a and the supporting part 20b located on the upper and lower surfaces of the main body part 10 can be adaptively stressed according to the surface of the vertebra in contact with the intervertebral cage 1, thereby further improving the clinical performance of the intervertebral cage 1 Repair effect.

In some examples, the intervertebral fusion cage 1 can be made by 3D printing. Thus, the intervertebral fusion cage 1 with multiple strut structures can be produced by using 3D printing technology.

In some examples, the main body part 10 and the support part 20 may be integrally formed. Thereby, the structural stability of the intervertebral cage 1 can be increased. In some other examples, the main body part 10 and the support part 20 can also be detachably assembled together. In this case, for example, the support part 20 can be used in a targeted manner according to different vertebrae and intervertebral conditions, thereby improving the applicability of the intervertebral cage 1 .

Fig. 4 is a schematic diagram showing the mesh structure of the main body of the intervertebral cage.

As shown in FIG. 4, the main body portion 10 may have a mesh structure. In this case, it can not only improve the structural stability of the main body part 10, but also facilitate the passage of Qi and blood in the intervertebral cage 1 and promote bone growth. In some examples, the main body portion 10 may be a planar mesh structure. Thus, the overall thickness of the intervertebral cage 1 can be reduced. In some examples, the network structure of the main body 10 may be a planar network structure composed of triangles, quadrilaterals, pentagons, hexagons or other polygons.

In some examples, the outer contour of the main body part 10 may be oval, rectangular, polygonal or irregular. For example, the main body 10 may have a grid-like hexagonal shape.

In some examples, in the main body portion 10, a filler that promotes bone growth may be filled. For example, artificial bone (not shown) may be filled in the main body part 10 . Thereby, bone growth can be induced and recovery can be promoted.

In some examples, the artificial bone can be combined with the main body 10 by thermocompression. Thereby, the artificial bone and the intervertebral cage 1 can be stably coupled.

In some examples, the artificial bone can include bioceramic particles and a degradable polyester material. In this case, the artificial bone can be degraded after promoting bone growth, forming an air-blood pathway in the network structure, avoiding obstruction of the intervertebral air-blood pathway, and conducive to bone growth and recovery.

In some examples, bioceramic particles can include, for example, hydroxyapatite, tricalcium phosphate, and the like. In some examples, the degradable polyester material may include, for example, polylactic acid, polycaprolactone, copolymers thereof, and the like.

In other examples, the main body 10 may also be a solid structure. In this case, the structure of the main body portion 10 is stronger.

In addition, in this embodiment, the constituent material of the main body portion 10 is not particularly limited, and at least one of metal, ceramic, and polymer can be used according to different application situations. In some examples, in consideration of both biocompatibility and hardness, the main body 10 is preferably made of metal titanium, polyetheretherketone (PEEK) and other materials.

In some examples, the main body 10 may also have a plurality of through holes (not shown) passing through up and down. As a result, Qi and blood pathways can be formed to promote bone growth and recovery. Wherein, the positions of the through holes are not particularly limited, and in some examples, the through holes may be evenly distributed in the main body portion 10 .

When the main body 10 has a network structure, the through holes may be in the shape of polygonal prisms such as triangular prisms, quadrangular prisms, and regular hexagonal prisms. Thereby, the size of the through hole can be increased while ensuring the structural stability of the main body portion 10 . In some other examples, the through hole may also be in the shape of a circle, a triangle, a quadrangle or other irregular shapes.

Fig. 5 is a side view showing the intervertebral cage. FIG. 6 is a partially enlarged view showing a side view of the intervertebral cage shown in FIG. 5 . FIG. 7 is a schematic top view showing three pillars of FIG. 6 .

In the present embodiment, the supporting part 20 may include a plurality of pillars obliquely protruding from the main body part 10 (see FIG. 5 ). In some examples, where the main body portion 10 is a mesh structure, a plurality of struts may obliquely protrude from the mesh structure.

In some examples, as shown in FIG. 7 , the plurality of struts of the supporting part 20 may further include at least a first type of strut 21 having a first inclination angle _θ1 and a second type of strut 22 having a _second inclination angle θ2. The first type of pillar 21 and the second type of pillar 22 may form an included angle φ.

In some examples, the first type of struts 21 may include a plurality of parallel struts 21 ₁ , 21 ₂ , 21 ₃ , . . . , 21 _n formed on the body portion 10; the second type of struts 22 may include A plurality of parallel struts 22 ₁ , 22 ₂ , 22 ₃ , . . . , 22 _n on the main body 10 .

In addition, the first inclination angle θ ₁ of the first type of pillar 21 is the angle formed by the first type of pillar 21 and the main body 10; the second inclination angle θ ₁ of the second type of pillar 22 is the angle between the first type of pillar 12 and the main body The included angle θ ₂ formed by 10. In some examples, the first inclination angle _θ1 and the _second inclination angle θ2 may range from 0 degrees to 90 degrees.

As mentioned above, since the first type of struts 21 and the second type of struts 22 form an angle with the main body 10 (the surface or imaginary surface of the main body 10), therefore, when the intervertebral fusion device 1 is implanted between the vertebrae , the first type of pillar 21 and the second type of pillar 22 can bear the pressure of the vertebrae in different directions, so that the intervertebral cage 1 can more effectively support the pressure from the vertebrae and avoid secondary damage to the vertebrae.

In addition, in some examples, the first inclination angle θ ₁ of the first type of pillar 21 and the second inclination angle θ ₂ of the second type of pillar 22 may take different angle values.

In some examples, the first angle of inclination θ1 of the first type of struts 21 and the second angle of inclination θ2 _of the _second type of struts 22 may be the same, and the first type of struts 21 and the second type of struts 22 form a clip. horn In this case, it is possible to make the intervertebral fusion cage 1 more effectively and evenly support the pressure from the vertebrae. In some examples, the included angle Can be 0 to 45 degrees.

In some examples, the struts of the first type of struts 21 and the respective struts of the second type of struts 22 respectively have a common base end 100 (see FIG. 6 ). Specifically, for example, the struts 21 1 of the first type of struts 21 and the struts 22 ₁ of the second type of struts 22 have a common base end 100 ₁ , and the struts 21 ₂ of the first type of struts 21 and the struts 22 of the second type of struts 22 have a common base end 100 ₁ . ₂ have a common base end 100 ₂ . Similarly, the struts 21 ₃ of the first type of struts 21 can have a common base end 100 ₃ with the struts 22 ₃ of the second type of struts 22, ..., the struts 21 _n of the first type of struts 21 can have the same base end 100 3 as the struts of the second type of struts 21 The struts 22 _n of 22 have a common base end 100 _n .

As mentioned above, the first type of struts 21 and the second type of struts 22 can have a common base end 100 , therefore, the supporting part 20 can bear the stress from the vertebrae in multiple different directions, thereby improving the stress state of the vertebrae.

In addition, in some examples, the stress concentration can be reduced by increasing the number of pillars in the support part 20 , so that the structural stress distribution inside the intervertebral fusion cage 1 is more uniform. In addition, in some examples, the base end 100 may also be disposed at the position of the solid structure of the support part 20 .

In some other examples, the struts of the first type of struts 21 and the struts of the second type of struts 22 may not have a common base end of the struts, but are directly inclined from the main body 10 .

In some examples, the struts of the support portion 20 may further include a third type of strut 23 (see FIG. 7 ) whose inclination direction is different from that of the first type of strut 21 and the second type of strut 22 . The third type of strut 23 has a third inclination angle θ ₃ (not shown) formed with the main body 10 . In addition, the third type of struts 23 respectively form angles with the first type of struts 21 and the second type of struts 22 . In this case, the three types of struts 21 , 22 , 23 in different directions of the support part 20 can make the intervertebral cage 1 more evenly stressed.

In addition, in some examples, the first type of struts 21 , the second type of struts 22 and the third type of struts 23 in different directions may have a common base end 100 . In some examples, the angles formed by the three types of struts having a common base end 100 may be equiangular. In this case, the base end 100 can be evenly stressed.

In some examples, the first type of struts 21 , the second type of struts 22 and the third type of struts 23 may be made of materials with certain elasticity. For example, the first type of support 21 , the second type of support 22 and the third type of support 23 may be made of one or more of metal titanium, polyetheretherketone (PEEK) and the like.

In addition, in some examples, the support portion 20 may further include a buffer portion (not shown) disposed at the ends of the struts (the first type of strut 21 , the second type of strut 22 and the third type of strut 23 ). In this case, since the buffer portion is in direct contact with the vertebrae, it is possible to buffer the force directly received between the intervertebral cage 1 and the vertebrae.

In some examples, the buffer portion may be at least one of a flat plate shape, a spherical shape, and an elliptical spherical shape. Thus, different shapes of the cushioning portion can be selected according to different cages.

In some examples, the buffer portion can also be inclined to a certain degree with the end of the pillar as the fulcrum. In this case, when the intervertebral fusion cage 1 is under pressure, the buffer portion will be inclined, so as to better fit the bone.

As mentioned above, the supporting part 20 may also be provided on the upper and lower surfaces of the main body part 10 at the same time. In this case, the intervertebral fusion device 1 can simultaneously induce and stimulate the bones through the support parts 20 on the upper and lower surfaces, so as to promote recovery and growth.

(second embodiment)

Fig. 8 is a perspective view showing an intervertebral fusion cage according to a second embodiment of the present disclosure.

The main difference between the adaptive intervertebral fusion cage 1A (sometimes referred to as "intervertebral fusion cage 1A") related to the second embodiment of the present disclosure and the intervertebral fusion cage 1 related to the first embodiment is that the intervertebral The main body portion 10 of the cage 1A has a frame structure (see FIG. 8 ).

In the intervertebral cage 1A according to this embodiment, the main body 10 has a three-dimensional frame structure. Specifically, the main body 10 may be formed by laminating multiple layers of planar network structures, with connecting columns between the planar network structures. In this case, since the main body portion 10 of the mesh structure has more spaces, the intervertebral air and blood passage can be improved.

In some examples, the main body 10 may be a cuboid network structure. In other examples, the main body 10 may also be a cylinder, a polygonal prism, or an irregular three-dimensional structure. Thus, the distribution of the internal structure of the main body 10 of the intervertebral fusion device 1A can be changed, and the air and blood passage of the intervertebral fusion device 1A implanted into the intervertebral space can be improved.

In some examples, when the main body 10 has a three-dimensional network structure, the first type of struts 21, the second type of struts 22 and the third type of struts 23 can be respectively formed at different positions of the network structure and from the network structure. The structures protrude obliquely (see Figure 8). In this case, the gas and blood exchange of the intervertebral fusion cage 1A can be further improved, and it is convenient to fill with fillers that promote bone growth. For example, in this case, more artificial bone can be filled in the main body part 10, so as to be more helpful in inducing bone growth and promoting bone recovery.

FIG. 9 is a schematic view showing a modified example of the intervertebral fusion cage according to the second embodiment of the present disclosure.

As shown in FIG. 9 , the main body portion 10 may have a blind hole 110 . Specifically, the blind hole 110 is provided in the solid structural portion of the main body 10 along the length direction of the main body 10 . In some examples, the blind hole 110 may be a rectangle, a square, a circle, an ellipse, a triangle, a polygon, or an irregular shape. In this case, after the intervertebral fusion device 1 is installed between the vertebrae, as the bone grows, some bones will enter the blind hole and attach to the intervertebral fusion device 1, so as to better realize the bone quality and intervertebral Fusion 1 incorporation.

In some other examples, artificial bone (not shown) may also be filled in the blind hole 110 . As a result, bone growth can be directed into the blind hole, accelerating fusion.

In some examples, the artificial bone is combined with the main body portion 10 by thermocompression. Thereby, the artificial bone and the intervertebral cage 1A can be firmly coupled.

In some examples, the artificial bone can include bioceramic particles and a degradable polyester material. In this case, the artificial bone can be degraded after promoting bone growth, forming air and blood pathways in the network structure, improving the exchange of air and blood between the vertebrae, and benefiting the growth and recovery of bones.

In some examples, bioceramic particles can include, for example, hydroxyapatite, tricalcium phosphate, and the like. In some examples, the degradable polyester material includes, for example, polylactic acid, polycaprolactone, copolymers thereof, and the like.

Various embodiments of the present disclosure are described above in the Detailed Description. Although these descriptions directly describe the above-described embodiments, it is to be understood that modifications and/or variations to the specific embodiments shown and described herein may occur to those skilled in the art. Any such modifications or variations that fall within the scope of this description are also intended to be embraced therein. Unless otherwise indicated, it is the inventor's intent that the words and phrases in the specification and claims be given the ordinary and customary meanings of those of ordinary skill.

The foregoing description of various embodiments of the disclosure that are known to the applicant at the time of filing the application has been presented, and is intended for purposes of illustration and description. This description is not intended to be exhaustive or to limit the invention to the precise form disclosed, and many modifications and variations are possible in light of the above teaching. The described embodiments serve to explain the principles of the disclosure and its practical application, and to enable others skilled in the art to utilize the disclosure in various embodiments and with various modifications as are suited to the particular use contemplated. Therefore, it is intended that the present disclosure not be limited to the particular embodiments disclosed for carrying out the present disclosure.

While particular embodiments of the present disclosure have been shown and described, it will be obvious to those skilled in the art that, based on the teachings of the disclosure, that changes and modifications can be made without departing from the disclosure and its broader aspects, The appended claims are therefore to cover within their scope all such changes and modifications as are within the true spirit and scope of this disclosure. Those skilled in the art will appreciate that, generally speaking, terms used in this disclosure are generally intended to be "open" terms (for example, the term "comprising" should be interpreted as "including but not limited to", the term "having" should be interpreted as " having at least", the term "comprising" should be interpreted as "including but not limited to", etc.).

Claims (10)

1. a kind of adaptive Invasive lumbar fusion device, which is characterized in that

Including：

Main part, in flat；And

Support portion is formed in the main part, and with the multiple pillars being formed slopely in the main part.

2. Invasive lumbar fusion device according to claim 1, it is characterised in that：

The multiple pillar includes the first kind pillar at least with the first inclination angle and the second class branch with the second inclination angle Column, the first kind pillar are formed with angle with the second class pillar.

3. Invasive lumbar fusion device according to claim 2, it is characterised in that：

The pillar of the first kind pillar and each pillar of the second class pillar are respectively provided with common cardinal extremity.

4. Invasive lumbar fusion device according to claim 2, it is characterised in that：

The main part has a reticular structure, the first kind pillar and the second class pillar from the reticular structure obliquely Protrusion.

5. Invasive lumbar fusion device according to claim 2, it is characterised in that：

The multiple pillar further includes and the different third class branch of the first kind pillar and the second class pillar tendency direction Column.

6. Invasive lumbar fusion device according to claim 1, it is characterised in that：

The main part and the support portion are integrally formed.

7. Invasive lumbar fusion device according to claim 4, it is characterised in that：

In the main part, it is also filled with artificial bone.

8. Invasive lumbar fusion device according to claim 1, it is characterised in that：

The support portion includes the buffer part being arranged in the end of the pillar.

9. Invasive lumbar fusion device according to claim 1, it is characterised in that：

The main part also has multiple through holes up and down.

10. Invasive lumbar fusion device according to claim 7, it is characterised in that：

The artificial bone includes bioceramic particle and degradable poly ester material.