CN210644254U

CN210644254U - Intervertebral fusion device with buffer part

Info

Publication number: CN210644254U
Application number: CN201920671222.4U
Authority: CN
Inventors: 王玉珏; 孙杨
Original assignee: Shenzhen Corliber Scientific Co ltd
Current assignee: Shenzhen Corliber Scientific Co ltd
Priority date: 2018-06-12
Filing date: 2019-05-11
Publication date: 2020-06-02
Anticipated expiration: 2029-05-11
Also published as: CN111920555A; CN110013367B; CN111920554A; CN111920555B; CN111839833A; CN110025411B; CN110013367A; CN115317205A; CN110063819B; CN213722665U; CN115212018A; CN110025411A; CN111839832B; CN110063819A; CN111920554B; CN111839832A

Abstract

The present disclosure provides an intervertebral cage with a buffer, which includes: a main body portion having a flat shape; and a support portion including a plurality of cushioning portions formed on the main body portion and arranged on the main body portion, the cushioning portions having an elastic portion formed on the main body portion and a flat portion connected to the elastic portion. In this case, after the intervertebral cage is implanted between the human body such as the vertebrae, the buffer part is in direct contact with the vertebrae to receive the pressure from the vertebrae, and since the buffer part has the elastic part formed on the main body part and the flat part connected to the elastic part, the buffer part is easily adaptively stressed according to the surface of the vertebrae in contact with the intervertebral cage, thereby improving the clinical restoration effect of the intervertebral 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

Intervertebral fusion device with buffer part

Technical Field

The present disclosure relates to an intervertebral cage with a relief.

Background

With the aggravation of aging of population and the change of life habits of people in modern cities, spine degenerative diseases represented by cervical spondylosis, cervical intervertebral disc protrusion, lumbar spinal stenosis and the like seriously affect the work and life of people. At present, conservative treatment methods such as drug therapy and physical therapy are mostly adopted when the above-mentioned disease conditions are in the early stage. However, as the patient's condition becomes more severe, more effective treatments, such as vertebroplasty, are contemplated to inhibit the patient's condition from becoming worse. For example, in case of lumbar intervertebral disc protrusion, when the intervertebral disc protrusion presses the vertebral canal beyond 1/3 or numbness, difficulty in movement, weakness of urination and defecation, etc. of the lower limbs occur, the treatment effect of the conservative treatment method is not obvious, and the patient needs to be considered to perform vertebral fusion.

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

Patent document 1 discloses a shapeable individualized spine fusion cage, which comprises an upper top plate, a lower top plate, a shaping spring, an internal biological silica gel ring, an external biological silica gel ring, a buckle A and a buckle B of the fusion cage. Go up roof and roof down link together through reset spring, interior biological silica gel circle and outer biological silica gel circle distribute in reset spring's inboard and outside to connect on roof about through buckle A and buckle B, and outer biological silica gel circles and has a bone cement filling hole.

However, in the above-mentioned patent document 1, although the height, angle, inclination, etc. of the fusion cage can be adjusted, the shapes of the upper top plate and the lower top plate of the fusion cage are fixed, and there is an individual difference between each individual operation, and the surface contacting with the human bone cannot be completely fitted. Therefore, the fusion cage of patent document 1 does not contribute to the fusion effect between vertebrae.

Documents of the prior art

Patent document 1: chinese patent application publication No. CN 104083235A.

Disclosure of Invention

The present disclosure has been made in view of the above-mentioned state of the art, and an object of the present disclosure is to provide an intervertebral cage which can be adapted to different shapes of intervertebral bones, increase the bone inducing ability thereof, and promote bone growth.

To this end, the present disclosure provides an intervertebral cage with a buffer, comprising: a main body portion having a flat shape; and a support portion including a plurality of cushioning portions formed on the main body portion and arranged on the main body portion, the cushioning portions having an elastic portion formed on the main body portion and a flat portion connected to the elastic portion.

In this case, after the intervertebral cage is implanted between the human body such as the vertebrae, the buffer part is in direct contact with the vertebrae to receive the pressure from the vertebrae, and since the buffer part has the elastic part formed on the main body part and the flat part connected to the elastic part, the buffer part is easily adaptively stressed according to the surface of the vertebrae in contact with the intervertebral cage, thereby improving the clinical restoration effect of the intervertebral 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.

In addition, in the intervertebral cage according to the present disclosure, the elastic portion may be formed in a zigzag shape. In this case, the elastic portion can provide a good cushioning effect.

In addition, in the intervertebral fusion cage according to the present disclosure, optionally, the elastic portion includes a first elastic sheet obliquely formed on the main body portion and a second elastic sheet connected to the first elastic sheet, and an included angle is formed between the first elastic sheet and the second elastic sheet. In this case, the support part can well bear the pressure from the vertebrae, thereby improving the stress condition of the vertebrae and avoiding secondary damage to the vertebrae.

In addition, in the intervertebral cage according to the present disclosure, optionally, the body portion has a mesh structure. In this case, the main body having the net structure facilitates the exchange of qi and blood and promotes the growth of bones.

In the intervertebral cage according to the present disclosure, the main body portion and the buffer portion may be integrally formed. Thereby, the structural stability of the intervertebral cage can be increased.

In addition, in the intervertebral cage according to the present disclosure, optionally, the body portion is further filled with artificial bone. This can induce bone growth and promote recovery.

In the intervertebral cage according to the present disclosure, the flat portion may be provided at an end of the elastic portion, and the flat portion may have one of a flat plate shape, an elliptical shape, and a polygonal shape. Therefore, the flat part can be better attached to the vertebral surface according to the condition of the vertebra, and the stress action is better played.

Further, in the intersomatic cage according to the present disclosure, the intersomatic cage may optionally be fabricated by 3D printing. Therefore, the 3D printing technology can be used for manufacturing the intervertebral fusion device with a complex buffer structure.

In the intervertebral fusion device according to the present disclosure, the body portion may further include a plurality of through holes that penetrate vertically. Therefore, a qi-blood passage can be formed in the intervertebral fusion cage, and the growth and recovery of bones can be promoted.

Additionally, in the intervertebral cage to which the present disclosure relates, optionally, the artificial bone comprises a degradable polyester material. In this case, the artificial bone can be degraded after the growth of the bone is promoted, and a qi-blood passage is formed in the main body portion and the supporting portion, which is advantageous for the growth and recovery of the bone.

In the intervertebral cage according to the present disclosure, the artificial bone may be coupled to the body portion by thermocompression. Thereby, the artificial bone can be firmly combined with the intervertebral cage.

In the intervertebral fusion device according to the present disclosure, the through-hole may have a regular hexagonal prism shape. This makes it possible to increase the size of the through-hole as much as possible while maintaining stability.

Further, in the intervertebral cage according to the present disclosure, optionally, the flat portion is parallel to the body portion. Therefore, the force can be stably applied, and the spine can be better attached.

According to the present invention, it is possible to provide an intervertebral cage which can adapt to different shapes of intervertebral bones, increase the bone inducibility thereof, and promote bone growth.

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 illustrating a state of use of an intervertebral cage according to an embodiment of the present disclosure.

Fig. 2 is a perspective view illustrating an intervertebral cage according to an embodiment of the present disclosure.

Fig. 3 is a cross-sectional view illustrating the intervertebral cage in the direction of section line a-a' of fig. 2.

Figure 4 is a net-like block diagram showing the body of the intervertebral cage.

Figure 5 is a side view showing the intervertebral cage.

Fig. 6 is a perspective view illustrating a buffer portion of the intervertebral cage according to the embodiment of the present disclosure.

Fig. 7 is a schematic sectional view showing the buffer portion along the sectional line B-B' of fig. 6.

Detailed Description

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 herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. General guidance for many of the terms used in this application is provided to those skilled in the art. Those of skill in the art will recognize many methods and materials similar or equivalent to those described herein that can be used in the practice of the present disclosure. Indeed, the disclosure is in no way limited to the methods and materials described.

Fig. 1 is a schematic view illustrating a state of use of an intervertebral cage according to an embodiment of the present disclosure. Fig. 2 is a perspective view illustrating an intervertebral cage according to an embodiment of the present disclosure. Figure 3 is a cross-sectional view of the intervertebral cage taken along section line A-A' of figure 2.

As shown in fig. 1 and 2, the present disclosure relates to an intervertebral cage 1 (sometimes referred to as "intervertebral cage 1") having a cushioning portion. In the present embodiment, the intersomatic cage 1 includes a main body portion 10 and a support portion 20. In the intervertebral cage 1 according to the present embodiment, the main body 10 is flat, and the support portion 20 includes a plurality of buffer portions 200 (see fig. 3) formed in the main body 10 and arranged on the main body 10. Each cushioning portion 200 has an elastic portion 210 formed on the main body portion 10 and a flat portion 200 connected to the elastic portion 210.

As shown in fig. 1, after the intersomatic cage 1 is implanted between vertebrae, for example, the flat portion 220 of the support portion 20 is in direct contact with the vertebrae to receive pressure from the vertebrae 2, and since the support portion 20 has the buffer portion 200 formed on the body portion, the buffer portion 200 is easily adaptively stressed according to the surface of the vertebrae in contact with the intersomatic cage 1, thereby improving the clinical restoration effect of the intersomatic cage 1. In addition, since the intervertebral cage 1 can stimulate the vertebral fusion surface more uniformly, it has good bone induction and can promote bone restoration growth.

In some examples, the support part 20 may also be provided on both upper and lower surfaces of the main body part 10 (see fig. 3). For example, the support portion 20 may be provided with a support portion 20a and a support portion 20b symmetrically with respect to the main body portion 10 (see fig. 5 described later). In this case, the

support parts

20a and 20b located at the upper and lower surfaces of the body part 10 may be adaptively stressed according to the surfaces of the vertebrae contacting the intersomatic cage 1, thereby further improving the clinical restoration effect of the intersomatic cage 1.

In some examples, the intervertebral cage 1 may be fabricated by 3D printing. Thus, the intervertebral cage 1 having a plurality of buffer structures can be manufactured by using the 3D printing technique.

In some examples, the main body portion 10 and the support portion 20 may also be integrally formed. This can increase the structural stability of the intervertebral cage 1. In other examples, the body portion 10 and the supporting portion 20 may be detachably assembled together. In this case, for example, the support part 20 can be used in a targeted manner depending on the different vertebrae and the conditions between the vertebrae, as a result of which the suitability of the intervertebral cage 1 can be increased.

As shown in fig. 4, in some examples, the body portion 10 may also have a mesh structure. In this case, not only structural stability of the main body 10 can be improved, but also the qi and blood passage of the intervertebral fusion cage 1 can be facilitated to promote bone growth. In some examples, the body portion 10 of the intervertebral cage 1 may have a frame structure (see fig. 4). Specifically, the main body 10 may be formed by stacking a plurality of planar mesh structures, and the planar mesh structures may have connecting columns therebetween. In this case, since the main body portion 10 of the net structure has many voids, the intervertebral qi and blood passage can be improved.

In other examples, the body portion 10 may be a planar mesh structure. This can reduce the overall thickness of the intervertebral cage 1. In some examples, the mesh structure of the body portion 10 may be a planar mesh structure consisting of triangles, quadrilaterals, pentagons, hexagons, or other polygons.

In some examples, the outer contour of the body portion 10 may be in an elliptical, rectangular, polygonal, or irregular pattern. For example, the main body portion 10 may have a grid-like rounded rectangle shape.

In some examples, in the body portion 10, a filler that promotes bone growth may be filled. For example, the main body 10 may be filled with an artificial bone (not shown). This can induce bone growth and promote recovery.

In some examples, the artificial bone is bonded to the body portion 10 by means of thermocompression bonding. This enables the artificial bone to be firmly bonded to the intervertebral cage 1.

In some examples, the artificial bone may include a bioceramic particle and a degradable polyester material. Under the condition, the artificial bone can be degraded after promoting the growth of the bone, and a qi and blood passage is formed in the net structure, so that the obstruction of the qi and blood passage between the vertebras is avoided, and the growth and the recovery of the bone are facilitated.

In some examples, the bioceramic particles may 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 body portion 10 may also be a solid structure. In this case, the structure of the main body portion 10 is more robust.

In the present embodiment, the material of the main body 10 is not particularly limited, and at least one of metal, ceramic, and polymer may be used depending on the application. In some examples, the main body 10 is preferably made of titanium metal, Polyetheretherketone (PEEK), or the like, for the sake of biocompatibility and hardness.

In some examples, the main body 10 may further include a plurality of through holes (not shown) penetrating vertically. This enables the formation of a qi-blood channel and promotes the recovery of bone growth. The positions of the through holes are not particularly limited, and in some examples, the through holes may be uniformly distributed in the main body 10.

When the body portion 10 has a mesh structure, the through-holes may have a polygonal prism shape, for example, a triangular prism, a quadrangular prism, or a regular hexagonal prism. This can increase the size of the through hole while ensuring the structural stability of the main body 10. In other examples, the through-holes may also be circular, triangular, quadrilateral, or other irregular shapes.

In some examples, the body portion 10 may also have a blind hole (not shown). Specifically, in some examples, the blind holes are provided in the solid structural portion of the body portion 10 along the length direction of the body portion 10. In some examples, the blind holes may be in the shape of a rectangle, square, circle, oval, triangle, polygon, irregular figure, or the like. In this case, after the intervertebral cage 1 is installed between vertebrae, as the bone grows, a portion of the bone enters the blind hole and adheres to the intervertebral cage 1, thereby better achieving the combination of the bone with the intervertebral cage 1.

In other examples, the blind hole may be filled with artificial bone (not shown). Therefore, the bone can be guided to grow into the blind hole, and fusion is accelerated.

Figure 5 is a side view showing the intervertebral cage. Fig. 6 is a perspective view illustrating a buffer portion of the intervertebral cage according to the embodiment of the present disclosure. Fig. 7 is a schematic sectional view showing the buffer portion along the sectional line B-B' of fig. 6.

In the present embodiment, as described above, the support portion 20 includes the plurality of cushioning portions 200 formed on the main body portion 10 and arranged on the main body portion 10. In some examples, a plurality of buffer portions 200 may be formed on the main body portion 20 at intervals. When a force is applied, for example, by contacting the plurality of cushioning portions 200 with the vertebral surface, the cushioning portions 200 can be elastically deformed to better conform to the shape of the vertebral surface.

In some examples, the buffer part 200 may have an elastic part 210 formed on the main body part and a flat part 220 connected to the elastic part 210. In this case, when the cushioning portion 200 is stressed, the elastic portion 210 is elastically deformed, and the flat portion 220 forms a good fit with the stressed surface, such as a vertebral surface.

In some examples, the elastic part 210 may be formed in a zigzag shape, in which case the elastic part can provide a good buffering action.

In some examples, the elastic part 210 may include a first elastic piece 211 formed at the main body part 10 in an inclined manner and a second elastic piece 212 connected to the first elastic piece 211. The first elastic piece 211 and the second elastic piece 212 may form an included angle θ. In some examples, an included angle θ formed by the first elastic piece 211 and the second elastic piece 212 may be 0 to 45 degrees, for example, the included angle θ may be 30 degrees, 45 degrees, or 60 degrees.

In other examples, the included angle θ between the first resilient piece 211 and the second resilient piece 212 is adjustable. In this case, the flexibility of the cushioning portion 200 of the support portion 20 can be improved, and the applicability of the intervertebral cage 1 can be enhanced.

The elastic portion 210 according to the present embodiment is not limited to the first elastic piece 211 and the second elastic piece 212. In some examples, the elastic portion 210 may also be a zigzag shape composed of more elastic pieces. For example, the elastic part 210 may include 3, 4, 5, or more spring pieces. In some examples, the plurality of spring plates form the elastic part 210 in an overlapping manner. This can increase the elastic deformability and stability of the elastic portion 210.

In some examples, the first resilient piece 211 and the second resilient piece 212 may also be detachably assembled together. Therefore, the included angle θ between the first elastic piece 211 and the second elastic piece 212 can be adjusted by replacing the first elastic piece 211 or the second elastic piece 212.

As described above, in the elastic part 210, since the first elastic sheet 211 and the second elastic sheet 212 form an included angle, when the intervertebral cage 1 is implanted between vertebrae, the elastic deformation of the first elastic sheet 211 and the second elastic sheet 212 bears and buffers the pressure of the vertebrae, so that the intervertebral cage 1 can more effectively support the pressure from the vertebrae, and the secondary damage to the vertebrae is avoided.

In some examples, the flat portion 220 and the elastic portion 210 may also be detachably fitted together. Thereby, the supporting effect of the intervertebral cage 1 can be adjusted by replacing the flat part 220 of a different material.

In some examples, as described above, the first resilient piece 211 may be obliquely disposed on the main body portion 10 (see fig. 4). In some examples, the first elastic pieces 211 are arranged side by side along a length direction of the main body part 10. Such as the first elastic sheet 211₁The first elastic sheet 211₂The first elastic sheet 211₃… …, a first elastic sheet 211_nAre arranged side by side on the main body 10. In this caseSecond elastic sheet 212₁The second elastic piece 212₂The second elastic piece 212₃… …, a second elastic sheet 212_nAnd the first elastic sheet 211₁The first elastic sheet 211₂The first elastic sheet 211₃… …, a first elastic sheet 211_nAre respectively connected and form an included angle theta.

In addition, in other examples, the arrangement direction of the first elastic sheet 211 may be different, for example, the first elastic sheet 211₁The first elastic sheet 211₂The first elastic sheet 211₃… …, a first elastic sheet 211_nMay be formed on the main body 10 at different inclination angles.

In addition, in some examples, the arrangement direction of the second elastic sheet 212 may be different, for example, the second elastic sheet 212₁The second elastic piece 212₂The second elastic piece 212₃… …, a second elastic sheet 212_nThe first elastic pieces 211 may be formed on the main body 10 at different inclination angles, respectively₁The first elastic sheet 211₂The first elastic sheet 211₃… …, a first elastic sheet 211_n. In this case, each cushioning portion 200 can thereby be more effectively adapted to the stress conditions of the vertebrae.

In addition, in some examples, stress concentrations may be reduced by increasing the number of bumpers 200 on the support 20, making the structural stress distribution inside the intersomatic cage 1 more uniform.

In addition, in other examples, the elastic portion 210 may also be formed by a pillar, a spring or a bent structure. This can increase the flexibility and selectivity of the structure of the elastic portion 210.

In some examples, the elastic portion 210 may be made of a material having a certain elasticity. Specifically, the elastic portion 210 may be made of one or more of metal, ceramic, and polymer. Thus, the elastic part 210 having appropriate elasticity can be made by selecting an appropriate material. For example: metallic titanium, Polyetheretherketone (PEEK), and the like.

In some examples, the material from which different portions of cushioning portion 200 are made may be different. Specifically, the elastic portion 210 and the flat portion 220 may be made of different materials, respectively. In this way, the intervertebral cage 1 can be selected according to the respective situation, with the struts having the respective inclination.

In some examples, the flat portion 220 may have at least one of a flat plate shape, an elliptical shape, and a polygonal shape. Thus, different flat 220 shapes may be selected for different fusers.

In some examples, the flat portion 220 may also be inclined to some extent with an end of the elastic portion 210 as a fulcrum. In this case, the flat portion 220 will tilt accordingly when the intervertebral cage 1 is subjected to pressure, so as to better conform to the bone.

As described above, the support portion 20 may be provided on both upper and lower surfaces of the main body portion 10. In this case, the intervertebral cage 1 can simultaneously induce stimulation to the bone through the supports 20 of the upper and lower surfaces, promoting the restoration of growth.

Various embodiments of the present disclosure are described above in the detailed description. While these descriptions directly describe the above 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 the present description are intended to be included therein. It is the intention of the inventors that the words and phrases in the specification and claims be given the ordinary and customary meaning to the skilled artisan, unless otherwise indicated.

The foregoing description of various embodiments of the present disclosure known to the applicant at the time of filing the present application has been presented and is intended for the purposes of illustration and description. It 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 are intended 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 disclosure not be limited to the particular embodiments disclosed for carrying out this 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 upon the teachings of the present disclosure, changes and modifications may be made without departing from this disclosure and its broader aspects and, therefore, the appended claims are to encompass within their scope all such changes and modifications as are within the true spirit and scope of this disclosure. It will be understood by those within the art that, in general, terms used in the present disclosure are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.).

Claims

1. An intervertebral fusion device with a buffer part is characterized in that,

the method comprises the following steps:

a main body portion having a flat shape; and

and a support part including a plurality of buffer parts formed on the main body part and arranged on the main body part, the buffer parts having an elastic part formed on the main body part and a flat part connected to the elastic part, the elastic part being formed in a zigzag shape.

2. An intersomatic cage according to claim 1, characterized in that:

the elastic part comprises a first elastic sheet and a second elastic sheet, the first elastic sheet is obliquely formed on the main body part, the second elastic sheet is connected with the first elastic sheet, and an included angle is formed between the first elastic sheet and the second elastic sheet.

3. An intersomatic cage according to claim 1, characterized in that:

the main body part has a net structure.

4. An intersomatic cage according to claim 1, characterized in that:

the main body portion and the cushioning portion are integrally formed.

5. An intersomatic cage according to claim 1, characterized in that:

the main body is also filled with artificial bone.

6. An intersomatic cage according to claim 1, characterized in that:

the flat portion is provided at an end of the elastic portion, and the flat portion has one of a flat plate shape, an elliptical shape, and a polygonal shape.

7. An intersomatic cage according to claim 1, characterized in that:

the main body further has a plurality of through holes penetrating vertically.

8. An intersomatic cage according to claim 5, characterized in that:

the artificial bone comprises a degradable polyester material.

9. An intersomatic cage according to claim 5, characterized in that:

the artificial bone is combined with the main body part in a hot pressing mode.