CN115212018A

CN115212018A - Support device for intervertebral fusion cage

Info

Publication number: CN115212018A
Application number: CN202210958654.XA
Authority: CN
Inventors: 孙杨; 王玉珏
Original assignee: Lixin Shenzhen Medical Devices Co ltd; Shenzhen Corliber Scientific
Current assignee: Lixin Shenzhen Medical Devices Co ltd; Shenzhen Corliber Scientific
Priority date: 2018-06-12
Filing date: 2019-05-13
Publication date: 2022-10-21
Also published as: CN110063819A; CN111920555B; CN110013367A; CN111920554B; CN115317205A; CN111839832B; CN110063819B; CN111839832A; CN111839833A; CN213722665U; CN110025411B; CN111920554A; CN110013367B; CN110025411A; CN210644254U; CN111920555A

Abstract

The invention provides a supporting device for an intervertebral fusion cage, which comprises a main body part and a plurality of supporting parts, wherein the plurality of supporting parts are formed at least one end of the main body part along the length direction of the main body part, the supporting parts comprise a plurality of supporting columns which are formed on the main body part in a manner of extending from the main body part along a tree shape, one ends of the supporting columns are fixed on the main body part, the other ends of the supporting columns are provided with supporting surfaces, and the supporting surfaces of the supporting columns are coplanar. In this case, the main body portion can support the intervertebral cage by the strut of the support portion formed thereon, and the strut can stably support the intervertebral cage by the support surface of one end thereof, whereby the stability of the cage can be improved.

Description

Support device for interbody fusion cage

The application is a divisional application of patent applications with the application date of 2019, 05 and 13, the application number of 201910392538.4 and the name of invention of a tree-shaped supporting device for an intervertebral fusion device.

Technical Field

The present disclosure relates to a support device for an intervertebral cage.

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 by more than 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 interbody 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 interbody 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 through buckle A and buckle B on roof from top to bottom, and have a bone cement filling hole on the outer biological silica gel circle.

However, in the above patent document 1, although the height, angle, inclination, and the like of the fusion device can be adjusted, the molded spring of the fusion device is unstable, and the patient is likely to slip off when using the fusion device. 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. CN104083235A.

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 capable of stably supporting vertebrae, increasing permeability, and promoting bone growth.

To this end, the present disclosure provides a tree-like support device for an intervertebral cage, comprising: a body portion having an elongated shape; and a support portion formed at least at one end of the main body portion along a length direction of the main body portion, the support portion including a plurality of support posts formed on the main body portion so as to extend in a tree shape from the main body portion, one end of each of the support posts being fixed to the main body portion and the other end having a support surface, the support surfaces of the support posts being substantially coplanar.

In this case, the long main body portion can support the fusion cage by the support post of the support portion formed thereon, and the support post can stably support the fusion cage by the support surface at one end thereof, whereby the stability of the fusion cage can be improved.

In the tree support device according to the present disclosure, the plurality of support columns may be rotationally symmetrical about a central axis direction of the main body. Thereby, the tree-shaped supporting device can be uniformly stressed.

In the tree support device according to the present disclosure, one end of the plurality of support columns fixed to the main body may be a common end. Therefore, stress concentration can be reduced, and the stress distribution of the internal structure of the stump supporting device is more uniform.

In the tree support device according to the present disclosure, the support portion may include at least three support columns, and the support columns may be disposed on the main body portion so as to be evenly distributed. Therefore, stress concentration can be reduced, and stress distribution of the internal structure of the stump supporting device is more uniform.

In the tree support device according to the present disclosure, the main body may be integrally formed with the support portion. From this, can improve stump strutting arrangement's overall stability.

In the tree support device according to the present disclosure, the support surface may be a triangle when viewed from a central axis direction of the main body. This can reduce the area of the support surface while ensuring stability as much as possible.

In addition, in the tree support device according to the present disclosure, the outer diameter of the pillar may be tapered from the two ends to the middle. Therefore, stress concentration can be reduced, and the stress distribution of the internal structure of the stump supporting device is more uniform.

In the tree support device according to the present disclosure, an outer diameter of a ring formed by the struts of the support portion may be larger than an outer diameter of the main body portion. This can reduce the volume of the main body while ensuring stability.

In addition, another aspect of the present disclosure provides an intervertebral cage, which is characterized in that a plurality of tree-shaped supporting devices of any one of the above are arranged in an array manner. Thereby, the permeability and stability of the intervertebral fusion device can be improved.

In addition, in an intervertebral cage according to another aspect of the disclosure, optionally, within the array, artificial bone is also filled. This can induce bone growth and promote recovery.

According to the invention, the intervertebral fusion device can stably support vertebrae, increase permeability 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 perspective view showing a tree support device according to an embodiment of the present disclosure.

Fig. 2 is a front view illustrating a tree support according to an embodiment of the present disclosure.

Fig. 3 is a plan view showing a tree support according to an embodiment of the present disclosure.

Fig. 4 is a perspective view illustrating an intervertebral cage according to an embodiment of the present disclosure.

Fig. 5 is a schematic view showing an array of tree supports of an intervertebral cage according to an embodiment of the present disclosure.

Reference numbers:

1 \ 8230, a tree-shaped supporting device 11 \ 8230, a main body 12 \ 8230, a supporting part 120 \ 8230, a supporting column 121 \ 8230, a supporting surface 2 \ 8230, an intervertebral fusion device 21 \ 8230, a tree-shaped supporting device array 22 \ 8230and a supporting plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. In the drawings, the same components or components having the same functions are denoted by the same reference numerals, and redundant description thereof will be omitted.

Fig. 1 is a perspective view showing a tree support device 1 according to an embodiment of the present disclosure.

As shown in fig. 1, the present disclosure provides a tree-like support device 1 for an intervertebral cage 2, comprising: a body 11 having an elongated shape; and a support portion 12 formed at least at one end of the main body portion 11 along a length direction of the main body portion 11, the support portion 12 including a plurality of support columns 120 formed on the main body portion 11 in such a manner as to extend along a tree from the main body portion 11, one end of each support column 120 being fixed to the main body portion 11 and the other end having a support surface 121, the support surfaces 121 of the respective support columns 120 being substantially coplanar.

In this case, the long body 11 can support the fusion cage by the support column 120 of the support portion 12 formed thereon, and the support column 120 can stably support the fusion cage by the support surface 121 at one end thereof, thereby improving the stability of the fusion cage.

In some examples, the body portion 11 may be cylindrical. In other examples, the body portion 11 may be prismatic, dumbbell, ellipsoid, etc. or other irregular shapes.

In some examples, the support portion 12 may be formed at one end of the body portion 11 along a length direction of the body portion 11. In other examples, the support portions 12 may be formed at both ends of the body portion 11 along the length direction of the body portion 11 at the body portion 11. Thereby, the pressure from the upper and lower sides can be properly supported.

In some examples, the main body portion 11 and the support portion 12 may be integrally formed. From this, can improve stump strutting arrangement's overall stability. In other examples, the tree support 1 may be fabricated by 3D printing. Thereby, the main body portion 11 and the support portion 12 can be integrally molded, thereby improving the structural stability of the tree support device 1.

In other examples, the main body 11 and the support 12 may be detachably assembled. In this case, the struts 120 can be arranged in a targeted manner according to the different vertebrae and the condition of the vertebrae, whereby the applicability of the tree support 1 can be increased.

In some examples, the end of the plurality of struts 120 fixed to the main body portion 11 may be a common end. Therefore, stress concentration can be reduced, and the stress distribution of the internal structure of the tree-shaped supporting device 1 is more uniform.

Fig. 2 is a front view showing the tree support 1 according to the embodiment of the present disclosure. Fig. 3 is a plan view showing the tree support device 1 according to the embodiment of the present disclosure.

As shown in fig. 2, in the present disclosure, the support surface 121 of each strut 120 is coplanar with the plane S. In this case, the tree support 1 can stably support the plane S on which the support surface 121 is located by the support portion 12.

In some examples, there may be a gap between the body portion 11 and the plane S on which the support surface 121 of the pillar 120 lies. This enables the formation of a qi-blood channel and promotes the growth and recovery of bone tissue.

As shown in fig. 3, in some examples, the support portion 12 may be constructed of a plurality of struts 120 of the same length. In other examples, the length, size, shape of the struts 120 of the support portion 12 may be uniform. In this case, the pressure to which each of the pillars 120 is subjected is uniform, and thus, the stability of the tree support device 1 can be improved.

In some examples, the struts 120 (in the present disclosure, the struts 120 include the strut 120a, the strut 120b, and the strut 120 c) may have rotational symmetry centered on the central axis direction of the main body portion 11. Thereby, the tree support 1 can be uniformly stressed.

In some examples, the supporting portion 12 may include at least three support posts 120, and each support post 120 is disposed on the main body portion 11 in a uniformly distributed manner. In this case, while having better stability, can also reduce the stress concentration, can make stump strutting arrangement inner structure stress distribution more even from this. In other examples, the support portion 12 may also include, for example, four struts 120, five struts 120. In other examples, the struts 120 of the support 12 may also be non-uniformly distributed. This allows the tree support device 1 to be customized as needed.

In the present disclosure, an obtuse angle may be formed between each of the strut 120a, the strut 120b, and the strut 120c when viewed from the central axis direction of the main body 11. Specifically, the center lines of the support post 120a, the support post 120b, and the support post 120c form an angle of 120 ° with each other when viewed from the central axis direction of the main body 11.

In some examples, the outer diameter of the strut 120 tapers from the ends to the middle. Therefore, stress concentration can be reduced, and stress distribution of the internal structure of the stump supporting device is more uniform.

In some examples, the support surface 121 is triangular when viewed from the central axis of the body portion 11. This can reduce the area of the support surface 121 while ensuring stability as much as possible. In other examples, the supporting surface 121 may also be a quadrilateral, a pentagon, a circle center, or other irregular shape.

In some examples, the support surfaces 121a, 121b, and 121c may be all the same in size and shape.

In some examples, the struts 120 of the support portion 12 form a ring having an outer diameter greater than the outer diameter of the main body portion 11. This can reduce the volume of the main body 11 while ensuring stability.

In the present disclosure, the tree support 1 may be obtained by means of topology optimization. Topology optimization (topology optimization) is a mathematical method for optimizing material distribution in a given area according to a given load condition, constraint conditions and performance indexes, and is a way of structural optimization. Specifically, in the present disclosure, the tree-like support device 1 obtained in the present disclosure is formed by hollowing out the material of the place where the force is small, leaving the portion where the force is mainly applied. In this case, the interbody fusion cage 2 using the tree-like support device 1 obtained by topology optimization as a support can minimize the use of materials and reduce rejection reactions of the human body, and thus, the therapeutic effect can be improved.

In some examples, customized topology optimizations can be made based on data of the human body. This allows adaptation to different situations of different patients.

In some examples, the tree support 1 is made of at least one of metal, ceramic, polymer. This enables the body 11 to be made of an appropriate material.

In some examples, the material of the tree-like support device 1 may be selected from one or more of polylactic acid-based material, polycaprolactone, polydioxanone, polyetheretherketone, polyglycolic acid. In addition, in some examples, the material of the tree-like support device 1 may also be selected from one or more of random copolymers or block copolymers of more than two members of lactide, caprolactone, p-dioxanone and glycolide. Furthermore, in other examples, the tree support 1 may also be composed of one or more of Polyorthoesters (POE), polyamphosphine, polycaprolactone, polyester urethane, polyanhydride imine copolymers, polyhydroxybutyrate and copolymers thereof, and polyamino acids (PAA).

In other examples, the tree support 1 may also be made of one or more of medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy, or magnesium alloy. In this case, the material is relatively low in price and high in material strength as compared with the absorbable material, and thus, the process difficulty and the production cost can be reduced.

Fig. 4 is a perspective view illustrating the intervertebral cage 2 according to the embodiment of the present disclosure. Fig. 5 is a schematic view showing the tree support device array 21 of the intersomatic cage 2 according to the embodiment of the present disclosure.

Another aspect of the present disclosure provides an intersomatic cage 2, as shown in fig. 4, characterized by a plurality of tree-like support devices 1 of any one of the above arranged in an array. This can improve the permeability and stability of the interbody fusion cage 2.

In the present disclosure, the intersomatic cage 2 may also include a support plate 22. In some examples, the support plate 22 may also be an elastic plate, sheet, device, or other component used in the interbody cage 2. Thereby, different vertebrae can be accommodated.

In some examples, the support plate 22 may further have a plurality of through holes (not shown) penetrating up and down. This enables the formation of a qi-blood channel and promotes the recovery of bone growth. Here, the position of the through-holes is not particularly limited, and in some examples, the through-holes may be uniformly distributed in the support plate 22.

In some examples, the through-hole may have a polygonal prism shape such as a triangular prism, a quadrangular prism, a regular hexagonal prism, or the like. This can increase the size of the through hole while ensuring the structural stability of the support plate 22. In other examples, the through-holes may also be circular, triangular, quadrilateral, or other irregular shapes.

In some examples, the support plate 22 may also have blind holes (not shown). Specifically, in some examples, the blind holes can be in the shape of rectangles, squares, circles, ellipses, triangles, polygons, or irregular patterns, among others. In this case, after the intervertebral cage 2 is fitted between the vertebrae, as the bone grows, a portion of the bone enters the blind hole and adheres to the intervertebral cage 2, thereby better achieving the coupling of the bone to the intervertebral cage 2.

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.

In some examples, there may be gaps between the tree supports 1 within the tree support array 21. In other examples, the tree supports 1 may be arranged in a crossing or overlapping manner within the tree support array 21. This can reduce the overall volume of the intervertebral cage 2.

In some examples, within the tree support array 21, artificial bone (not shown) is also filled. This can induce bone growth and promote recovery.

In some examples, the artificial bone may be coupled to the tree support device array 21 by means of thermocompression bonding. This enables the artificial bone to be firmly bonded to the interbody fusion cage 2.

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 some examples, the porosity of the tree support array 21 can be 70% to 90%. In the present disclosure, the porosity of the tree support array 21 may be 80%. Therefore, the structure strength is ensured, and the circulation of qi and blood in the bone tissue is facilitated, so that the growth of the bone tissue is promoted.

While the invention has been specifically described above in connection with the drawings and examples, it will be understood that the above description is not intended to limit the invention in any way. Those skilled in the art can make modifications and variations as necessary without departing from the true spirit and scope of the invention, and such modifications and variations are intended to be within the scope of the invention.

Claims

1. A support device for an intervertebral cage, characterized in that:

the supporting part comprises a plurality of supporting columns which are formed on the main body part in a mode of extending from the main body part along a tree shape, one ends of the supporting columns are fixed on the main body part, the other ends of the supporting columns are provided with supporting surfaces, and the supporting surfaces of the supporting columns are coplanar.

2. The support device of claim 1, wherein:

the main body part and the supporting part can be detached.

3. The support device of claim 1, wherein:

the length, size and shape of each strut are consistent.

4. The support device of claim 1, wherein:

the support surfaces of the struts are of the same size and shape.

5. The support device of claim 1, wherein:

the outer diameter of the ring formed by the plurality of struts is larger than the outer diameter of the main body.

6. The support device of claim 1, wherein:

the plurality of struts are rotationally symmetric around the central axis of the main body.

7. The support device of claim 1, wherein:

a gap is formed between the main body part and the plane where the supporting surface of the strut is located.

8. The support device of claim 1, wherein:

the support surface is three-sided in a direction along a central axis of the main body.

9. The support device of claim 1, wherein:

one end of each pillar fixed to the main body is a common end.

10. An intervertebral cage, comprising:

having support plates and a plurality of support means according to any one of claims 1 to 9, the plurality of support means being arranged in an array between the support plates.