CN213722665U - Intervertebral fusion device with multiple buffering parts - Google Patents

Abstract

The utility model provides an interbody fusion cage with a plurality of buffers, a serial communication port, including being the main part of platykurtic and forming a plurality of buffers at the main part, have the interval between the adjacent buffer in a plurality of buffers, the buffer has the elastic component that forms on the main part and the flat portion of being connected with the elastic component, and the elastic component forms into tortuous shape. 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 multiple buffering parts

The application is filed asYear 2019, 05 and 11Application No. is201920671222.4The invention is named asHas the advantages ofIntervertebral fusion device of buffer partDivisional application of the patent application.

Technical Field

The utility model relates to an intervertebral fusion cage with a plurality of buffer parts.

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-mentionedpatent 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 ofpatent 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 invention has been made in view of the above-mentioned prior art, and an object of the present invention is to provide an intervertebral fusion cage which can adapt to the shape of different intervertebral bones, increase the bone inducing ability, and promote the bone growth.

Therefore, the utility model provides an intervertebral fusion cage with buffer, its characterized in that, including being the main part of platykurtic and forming a plurality of buffers of main part, have the interval between the adjacent buffer in a plurality of buffers, the buffer has the elastic component that forms on the main part and with the flat portion that the elastic component is connected, the elastic component forms into tortuous shape.

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.

Additionally, in the intervertebral fusion device of the present invention, optionally, the elastic portion includes a first elastic piece and a second elastic piece, wherein the first elastic piece and the second elastic piece are connected to each other, and the first elastic piece and the second elastic piece form an adjustable included angle. In this case, the flexibility of the cushioning portion of the support portion can be improved, and the applicability of the intervertebral cage can be enhanced.

In the intervertebral fusion device according to the present invention, the main body may have a frame structure in which a plurality of planar mesh structures are stacked. In this case, since the main body portion of the mesh structure has many voids, the intervertebral qi and blood passage can be improved.

In the intervertebral fusion device according to the present invention, the main body may have a plurality of through holes that vertically penetrate through the main body, and the through holes may form an air-blood passage that promotes bone growth. In this case, a qi-blood passage can be formed to promote the recovery of bone growth.

In addition, in the intervertebral fusion device according to the present invention, optionally, the plurality of buffer portions may be symmetrically provided on an upper surface and a lower surface of the main body portion. In this case, the cage can induce stimulation to the bone simultaneously through the support portions of the upper and lower surfaces, promoting restoration of growth.

In addition, in the intervertebral fusion cage of the present invention, optionally, the outer contour of the main body portion may be an ellipse, a rectangle, a polygon, or an irregular figure. This enables different body portions to be selected for different fusion devices.

In addition, in the intervertebral fusion cage of the present invention, optionally, the main body further has a blind hole, and an artificial bone is filled in the blind hole. Therefore, the combination of the bone and the intervertebral fusion device can be better realized.

In the intervertebral fusion device according to the present invention, the first elastic pieces of the plurality of buffer portions may be arranged side by side along a longitudinal direction of the main body portion. Under the condition, the second elastic sheet can be conveniently connected with the first elastic sheet to form an included angle.

Further, in the intervertebral cage of the present invention, optionally, the flat portion is parallel to the main body portion. Therefore, the force can be stably applied to better fit the spine.

In the intervertebral fusion device according to the present invention, the flat portion is provided at an end of the elastic portion, and the flat portion is inclined with the end of the elastic portion as a fulcrum. In this case, the flat portion will tilt accordingly when the intervertebral cage is subjected to pressure, so that a better fit to the bone is obtained.

In addition, in the intervertebral fusion cage of the present invention, optionally, the artificial bone is coupled to the main body by thermocompression. Thereby, the artificial bone can be firmly combined with the intervertebral cage.

In the intervertebral fusion device according to the present invention, 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.

According to the utility model discloses, can provide one kind and can adapt to the shape of different intervertebral bones, increase its osteoinduction, promote the interbody fusion cage of skeleton growth.

Drawings

Embodiments of the invention 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 cage according to an embodiment of the present invention.

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

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 showing a buffer portion of the intervertebral cage according to the embodiment of the present invention.

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 the present application 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 invention belongs. General guidance for 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 herein that can be used in the practice of the present invention. Indeed, the present invention is in no way limited to the methods and materials described.

Fig. 1 is a schematic view showing a state of use of an intervertebral cage according to an embodiment of the present invention. Fig. 2 is a perspective view illustrating an intervertebral cage according to an embodiment of the present invention. 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 invention relates to an intervertebral cage 1 (also referred to as an "intervertebral cage 1" in some cases) having a buffer portion. In the present embodiment, theintersomatic cage 1 includes amain body portion 10 and asupport portion 20. In theintervertebral cage 1 according to the present embodiment, themain body 10 is flat, and thesupport portion 20 includes a plurality of buffer portions 200 (see fig. 3) formed in themain body 10 and arranged on themain body 10. Eachcushioning portion 200 has anelastic portion 210 formed on themain body portion 10 and aflat portion 200 connected to theelastic portion 210.

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

In some examples, thesupport part 20 may also be provided on both upper and lower surfaces of the main body part 10 (see fig. 3). For example, thesupport portion 20 may be provided with asupport portion 20a and asupport portion 20b symmetrically with respect to the main body portion 10 (see fig. 5 described later). In this case, thesupport parts 20a and 20b located at the upper and lower surfaces of thebody part 10 may be adaptively stressed according to the surfaces of the vertebrae contacting theintersomatic cage 1, thereby further improving the clinical restoration effect of theintersomatic cage 1.

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

In some examples, themain body portion 10 and thesupport portion 20 may also be integrally formed. This can increase the structural stability of theintervertebral cage 1. In other examples, thebody portion 10 and the supportingportion 20 may be detachably assembled together. In this case, for example, thesupport 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 theintervertebral cage 1 can be increased.

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

As shown in fig. 4, in some examples, thebody portion 10 may also have a mesh structure. In this case, not only structural stability of themain body 10 can be improved, but also the qi and blood passage of theintervertebral fusion cage 1 can be facilitated to promote bone growth. In some examples, thebody portion 10 of theintervertebral cage 1 may have a frame structure (see fig. 4). Specifically, themain 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 themain body portion 10 of the net structure has many voids, the intervertebral qi and blood passage can be improved.

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

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

In some examples, in thebody portion 10, a filler that promotes bone growth may be filled. For example, themain 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 thebody portion 10 by means of thermocompression bonding. This enables the artificial bone to be firmly bonded to theintervertebral 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, thebody portion 10 may also be a solid structure. In this case, the structure of themain body portion 10 is more robust.

In the present embodiment, the material of themain 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, themain body 10 is preferably made of titanium metal, Polyetheretherketone (PEEK), or the like, for the sake of biocompatibility and hardness.

In some examples, themain 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 themain body 10.

When thebody 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 themain body 10. In other examples, the through-holes may also be circular, triangular, quadrilateral, or other irregular shapes.

In some examples, thebody 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 thebody portion 10 along the length direction of thebody 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 theintervertebral cage 1 is installed between vertebrae, as the bone grows, a portion of the bone enters the blind hole and adheres to theintervertebral cage 1, thereby better achieving the combination of the bone with theintervertebral 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 showing a buffer portion of the intervertebral cage according to the embodiment of the present invention. 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, thesupport portion 20 includes the plurality ofcushioning portions 200 formed on themain body portion 10 and arranged on themain body portion 10. In some examples, a plurality ofbuffer portions 200 may be formed on themain body portion 20 at intervals. When a force is applied, for example, by contacting the plurality ofcushioning portions 200 with the vertebral surface, thecushioning portions 200 can be elastically deformed to better conform to the shape of the vertebral surface.

In some examples, thebuffer part 200 may have anelastic part 210 formed on the main body part and aflat part 220 connected to theelastic part 210. In this case, when thecushioning portion 200 is stressed, theelastic portion 210 is elastically deformed, and theflat portion 220 forms a good fit with the stressed surface, such as a vertebral surface.

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

In some examples, theelastic part 210 may include a firstelastic piece 211 formed at themain body part 10 in an inclined manner and a secondelastic piece 212 connected to the firstelastic piece 211. The firstelastic piece 211 and the secondelastic piece 212 may form an included angle θ. In some examples, an included angle θ formed by the firstelastic piece 211 and the secondelastic 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 firstresilient piece 211 and the secondresilient piece 212 is adjustable. In this case, the flexibility of thecushioning portion 200 of thesupport portion 20 can be improved, and the applicability of theintervertebral cage 1 can be enhanced.

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

In some examples, the firstresilient piece 211 and the secondresilient piece 212 may also be detachably assembled together. Therefore, the included angle θ between the firstelastic piece 211 and the secondelastic piece 212 can be adjusted by replacing the firstelastic piece 211 or the secondelastic piece 212.

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

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

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

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

In addition, in some examples, the arrangement direction of the secondelastic sheet 212 may be different, for example, the secondelastic sheet 212₁The secondelastic piece 212₂The secondelastic piece 212₃… …, a secondelastic sheet 212_nThe firstelastic pieces 211 may be formed on themain body 10 at different inclination angles, respectively₁The firstelastic sheet 211₂The firstelastic sheet 211₃… …, a firstelastic sheet 211_n. In this case, each cushioningportion 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 ofbumpers 200 on thesupport 20, making the structural stress distribution inside theintersomatic cage 1 more uniform.

In addition, in other examples, theelastic 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 theelastic portion 210.

In some examples, theelastic portion 210 may be made of a material having a certain elasticity. Specifically, theelastic portion 210 may be made of one or more of metal, ceramic, and polymer. Thus, theelastic 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 ofcushioning portion 200 are made may be different. Specifically, theelastic portion 210 and theflat portion 220 may be made of different materials, respectively. In this way, theintervertebral cage 1 can be selected according to the respective situation, with the struts having the respective inclination.

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

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

Various embodiments of the present invention have been 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 invention known to the applicant at the time of filing has been presented and is intended for the 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 are intended to explain the principles of the invention and its practical application and to enable others skilled in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed for carrying out this invention.

While particular embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that, based upon the teachings of the present invention, changes and modifications may be made without departing from this invention 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 invention. It will be understood by those within the art that, in general, terms used herein 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 (9)

Translated fromChinese

1.一种具有多个缓冲部的椎间融合器，其特征在于，包括呈扁平状的具有由多层平面网状结构层叠而成的框架结构的主体部以及形成在所述主体部的多个缓冲部，所述多个缓冲部中的相邻的缓冲部之间具有间隔，所述缓冲部具有形成在所述主体部上的弹性部和与所述弹性部连接的平坦部，所述弹性部形成为曲折形状。1. An intervertebral cage with a plurality of buffer portions, characterized in that it comprises a flat main body portion having a frame structure formed by stacking a multi-layered planar mesh structure, and a plurality of Each buffer portion has a space between adjacent buffer portions among the plurality of buffer portions, the buffer portion has an elastic portion formed on the main body portion and a flat portion connected to the elastic portion, the buffer portion is The elastic portion is formed in a meandering shape.2.根据权利要求1所述的椎间融合器，其特征在于：2. The cage according to claim 1, wherein:所述弹性部包括倾斜形成在所述主体部的第一弹片以及与所述第一弹片连接的第二弹片，所述第一弹片与所述第二弹片形成有可调节的夹角。The elastic part includes a first elastic piece formed obliquely on the main body part and a second elastic piece connected with the first elastic piece, and an adjustable included angle is formed between the first elastic piece and the second elastic piece.3.根据权利要求1所述的椎间融合器，其特征在于：3. The cage according to claim 1, wherein:所述主体部具有多个上下贯通的贯通孔，所述贯通孔形成促进骨骼生长的气血通路。The main body portion has a plurality of through-holes penetrating up and down, and the through-holes form a qi and blood passage for promoting bone growth.4.根据权利要求1所述的椎间融合器，其特征在于：4. The cage according to claim 1, wherein:所述多个缓冲部对称设置在所述主体部的上表面和下表面。The plurality of buffer parts are symmetrically arranged on the upper surface and the lower surface of the main body part.5.根据权利要求1所述的椎间融合器，其特征在于：5. The cage according to claim 1, wherein:所述主体部的外轮廓呈椭圆形、长方形、多边形或不规则图形。The outer contour of the main body is oval, rectangular, polygonal or irregular.6.根据权利要求1所述的椎间融合器，其特征在于：6. The cage according to claim 1, wherein:所述主体部还具有盲孔，并且在所述盲孔中填充有人工骨。The main body part also has a blind hole, and the blind hole is filled with artificial bone.7.根据权利要求2所述的椎间融合器，其特征在于：7. The cage according to claim 2, wherein:所述多个缓冲部的所述第一弹片沿着所述主体部的长度方向并排地设置。The first elastic pieces of the plurality of buffer parts are arranged side by side along the longitudinal direction of the main body part.8.根据权利要求1所述的椎间融合器，其特征在于：8. The cage according to claim 1, wherein:所述平坦部平行于所述主体部。The flat portion is parallel to the body portion.9.根据权利要求1所述的椎间融合器，其特征在于：9. The cage according to claim 1, wherein:所述平坦部设置在所述弹性部的端部，并且所述平坦部以所述弹性部的端部为支点进行倾斜。The flat portion is provided at an end portion of the elastic portion, and the flat portion is inclined with the end portion of the elastic portion as a fulcrum.

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