CN212662034U

CN212662034U - Intervertebral fusion cage

Info

Publication number: CN212662034U
Application number: CN201921380674.3U
Authority: CN
Inventors: 张靖; 徐凯; 文晓宇; 孙陆; 刘也
Original assignee: Beijing Zhisu Health Technology Co ltd
Current assignee: Beijing Zhisu Health Technology Co ltd
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2021-03-09
Anticipated expiration: 2029-08-23

Abstract

The utility model discloses an interbody fusion cage, interbody fusion cage includes: a support structure; the supporting structure is provided with a crystal structure, the crystal structure is constructed by connecting rods which are mutually overlapped in space, and a through hole is formed in a gap between the connecting rods. The crystal structure is matched with the bone elastic modulus of a human body, so that the interbody fusion cage conforms to the bone elastic modulus of the human body. The technical problems that the stress shielding effect of the interbody fusion cage implanted into a human body can be caused if the elastic modulus of the interbody fusion cage is not matched with the elastic modulus of human bones due to different elastic modulus of each human bone, so that bone absorption is caused, the bone structure prosthesis is loosened, and the bone structure prosthesis is failed to be implanted are solved.

Description

Intervertebral fusion cage

Technical Field

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

Background

Currently, implantation of bone structural prostheses, such as intervertebral cages, is a routine treatment option. The structural design of the interbody fusion cage needs to consider the elastic modulus of human bones, the elastic modulus of each human bone is different, and even the elastic modulus of different bones of the same person is also different. If the elastic modulus of the interbody fusion cage is different from that of the skeleton of a human body, the stress shielding effect of the interbody fusion cage can be caused after the interbody fusion cage is implanted into the human body, so that bone absorption is caused, the interbody fusion cage is loosened, and the bone structure prosthesis is failed to be implanted.

So utility model people discover to have following problem among the prior art at least, because the elastic modulus of each individual skeleton all inequality, if the elastic modulus of interbody fusion cage does not match with the elastic modulus of people's skeleton, then can lead to implanting human interbody fusion cage stress shielding effect, cause the bone to absorb, and then make bone structure false body not hard up, bone structure false body plants the technical problem who fails.

SUMMERY OF THE UTILITY MODEL

The application provides an interbody fusion cage, its aim at, through the bone elastic modulus of crystal structure matching human body for interbody fusion cage accords with human bone elastic modulus.

The interbody cage comprises a support structure;

a crystal structure is distributed on the supporting structure;

the crystal structure is constructed by connecting rods which are mutually lapped in space, and through holes are formed in gaps among the connecting rods.

Optionally, the through holes are arranged in layers.

Optionally, the support structure has a first end face and a second end face located at two ends of the support structure, and the crystal structure is disposed on the sidewall between the first end face and the second end face.

Optionally, a plurality of protrusions are respectively arranged on the first end surface and/or the second end surface.

Optionally, the cross section of one end of the protrusion, which is connected with the first end surface or the second end surface, is gradually decreased towards the other end.

Optionally, the first end face and the second end face are oppositely disposed on the support structure, and the support structure is disposed with a central hole penetrating through the first end face and the second end face.

Optionally, an instrument hole is provided on a side surface of the support structure between the first end surface and the second end surface, and the central hole is communicated with the outside of the side surface of the support structure through the instrument hole.

Optionally, the crystal structure on the sidewall of the support structure extends towards and meets the central hole.

Optionally, a spatial angle is formed between the first end face and the second end face.

Optionally, the support structure sidewall profile is rounded in transition.

As can be seen from the above, based on the above embodiments, the intervertebral cage conforms to the bone elastic modulus of the human body by matching the crystal structure to the bone elastic modulus of the human body. The technical problems that the stress shielding effect of the interbody fusion cage implanted into a human body can be caused if the elastic modulus of the interbody fusion cage is not matched with the elastic modulus of human bones due to different elastic modulus of each human bone, so that bone absorption is caused, the bone structure prosthesis is loosened, and the bone structure prosthesis is failed to be implanted are solved.

Drawings

FIG. 1 is a schematic view of a first side of the interbody fusion cage of the present invention;

FIG. 2 is a schematic view of a second side of the intervertebral cage according to the present invention;

FIG. 3 is a schematic top view of the intervertebral cage of the present invention;

fig. 4 is a schematic structural view of the third side of the intervertebral fusion device of the present invention.

Description of the labeling:

1 supporting structure

11 crystal structure

111 connecting rod

112 through hole

12 first end face

13 second end face

14 projecting part

15 center hole

16 instrument hole

Angle of theta space

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.

The technical solution of the present invention will be described in detail with reference to the following embodiments. Several of the following embodiments may be combined with each other and some details of the same or similar concepts or processes may not be repeated in some embodiments.

In some embodiments of the application, the interbody fusion cage has the functions of supporting, load sharing and the like, and can better recover the intervertebral space height and the physiological curvature of the spine;

the interbody fusion cage is made of polyether ether ketone (PEEK), however, PEEK does not have biological activity as a manufacturing material of the interbody fusion cage, can not realize real fusion with the tissues of the upper and lower bony end plates, most surfaces are covered by fibrous tissues, micro-motion is easy to generate, and the biomechanical stability between vertebral bodies is further influenced, namely the stability of the whole structure can not be ensured; the titanium alloy interbody fusion cage has better biocompatibility and supporting strength;

the interbody fusion cage is composed of a solid frame structure and a through hole structure. The solid support mostly adopts a solid axial support surface or a lateral support column, so that the volume of the interbody fusion cage is greatly occupied, the porosity of the fusion cage is too small, and the bone fusion effect is influenced; the through hole structure of the existing intervertebral fusion cage mostly adopts an upper surface main through hole and a lower surface main through hole or a pore structure, and the elasticity modulus of the fusion cage is influenced by the oversize size of the main through hole; the existing pore structure is mostly formed by a regular space regular octahedral structure and is mostly distributed on the upper surface, the lower surface or the left side and the right side of the interbody fusion cage, and the porosity cannot be customized individually; the utility model discloses the supporting role is also undertaken to mesopore structure, realizes the maximize of interbody fusion cage porosity, compromises two big functions of elastic modulus matching and porosity.

The intervertebral fusion device is not provided with a friction coefficient increasing device, and the problems of looseness and displacement in the later period of implantation are easily caused. The fusion cage of the utility model is provided with a protruding part and a lateral instrument groove, which is favorable for matching with a conveying tool to send the fusion cage into the intervertebral finger to position and fix the fusion cage.

Fig. 1 is the structural schematic diagram of the first side of the intervertebral fusion device of the present invention, fig. 2 is the structural schematic diagram of the second side of the intervertebral fusion device of the present invention, fig. 3 is the top view schematic diagram of the intervertebral fusion device of the present invention, fig. 4 is the structural schematic diagram of the third side of the intervertebral fusion device of the present invention. As shown in fig. 1 and 2, and 3 and 4, in one embodiment, the present application provides an intervertebral cage comprising a support structure 1;

a crystal structure 11 is arranged on the supporting structure 1;

the crystal structure 11 is built up by connecting rods 111 overlapping each other in space, the spaces between the connecting rods 111 forming through holes 112.

In the present exemplary embodiment, the crystal structure 11 arranged on the support structure 1 is used to adapt the modulus of elasticity of bones of different persons. As described above, the crystal structure 11 is a truss structure overlapped by the tie bars 111, the gaps between the tie bars 111 form the through holes 112, the preferred range of the aperture (i.e., D in fig. 3) of the through holes 112 is 100 μm to 800 μm, and the preferred range of the rod diameter (i.e., Dt in fig. 3) of the tie bars 111 is 100 μm to 1500 μm. In addition, porosity is also a very important parameter in the crystal structure 11, and a preferable range of the porosity parameter is 5% to 90%. Finally, the crystal structure 11 can make the rigidity of the interbody fusion cage approximate to the rigidity of human skeleton, reduce the stress shielding effect and ensure that the rigidity is 1000 to 100000N/mm. The specific method for adjusting the elastic modulus of the intervertebral cage is to adjust the rod diameter of the connecting rod 111, the aperture of the gap-forming through-hole 112, and the porosity as described above. The overall width of the intervertebral cage is 11 mm to 16 mm, the length is also 11 mm to 16 mm, and the thickness is 4 mm to 12 mm.

Under the structure, the growth of bone is facilitated, the bone fusion is promoted, and the requirement of the intervertebral fusion operation is met.

The interbody fusion cage may be formed integrally from a material such as titanium alloy, and specifically, the material of the interbody fusion cage may include Al (aluminum), V (vanadium), and Ti (titanium). Al (aluminum) 5.5-6.75 wt%, V (vanadium) 3.5-4.5 wt%, wherein the impurities should be controlled to Fe (iron) below 0.3 wt%, C (carbon) below 0.08 wt%, N (nitrogen) below 0.05 wt%, H (hydrogen) below 0.015 wt%, O (oxygen) below 0.2 wt%, and Ti (titanium) as the rest.

In one embodiment, the vias 112 are arranged in layers.

In this embodiment, a specific arrangement manner of the through holes 112 is provided, on one hand, the interbody fusion cage is more uniform when being stressed, and on the other hand, the interbody fusion cage is convenient to manufacture, because the structure of the interbody fusion cage is more complex, and the crystal structure 11 of each interbody fusion cage is different, and the corresponding structures of the crystal structures 11 are different, the interbody fusion cage is difficult to realize by machining or mold processing, but the interbody fusion cage can be manufactured by adopting a 3D printing manner, so if the through holes 112 are arranged in a layered manner, it is obvious that the through holes 112 can be more easily and easily manufactured by adopting a layer-by-layer processing.

In an embodiment, the support structure 1 has a first end face 12 and a second end face 13 at both ends of the support structure 1, and the crystal structure 11 is arranged on a sidewall between the first end face 12 and the second end face 13.

In the present embodiment a position of the arrangement of the crystal structure 11 on the support structure 1 is provided. When the intervertebral cage is implanted into a human body, the intervertebral cage is implanted between two vertebrae, the first end surface 12 and the second end surface 13 are respectively contacted with the upper vertebrae and the lower vertebrae, and the crystal structure 11 is arranged on the side wall between the first end surface 12 and the second end surface 13.

In an embodiment, a plurality of protrusions 14 are respectively arranged on the first end surface 12 and/or the second end surface 13.

In the present embodiment, a specific embodiment is provided in which a plurality of protrusions 14 are arranged on the first end surface 12 and/or the second end surface 13, respectively. When the intervertebral cage is implanted into the vertebrae, the first end surface 12 and/or the second end surface 13 will contact the upper and lower vertebrae, and protrusions 14 are required on the contact surfaces to ensure the stability of the intervertebral cage between the vertebrae. In addition, the protrusions 14 are provided on the first end face 12 and/or the second end face 13, also integrally formed to the support structure 1.

In one embodiment, the protrusion 14 is connected to the first end surface 12 and/or the second end surface 13, and the cross section of the protrusion gradually decreases toward the other end.

In the present embodiment, it is provided that the cross-sectional area of the end of the protrusion 14 in contact with the vertebrae is smaller than the cross-sectional area of the end of the protrusion 14 connected to the support structure 1 when the protrusion 14 is in contact with the vertebrae. Preferably, the protrusion 14 may be a frustum, the lower surface of which is connected to and integrally formed with the support structure 1 and the upper surface of which is in contact with the vertebrae.

In an embodiment, the first end surface 12 and the second end surface 13 are oppositely arranged on the support structure 1, and the support structure 1 is provided with a central hole 15 penetrating the first end surface 12 and the second end surface 13.

In the embodiment of the intervertebral cage provided with the central hole 15, the first end surface 12 and the second end surface 13 can be understood as upper and lower end surfaces, the first end surface 12 and the second end surface 13 are oppositely arranged, and a central hole 15 is penetrated in the middle of the first end surface and the second end surface. In addition, the distance from the central hole 15 to the side wall of the support structure 1 ranges from 3 to 6 mm.

In an embodiment, instrument holes 16 are provided on the side of the support structure 1 between the first end face 12 and the second end face 13, and the central hole 15 communicates with the outside of the side of the support structure 1 through the instrument holes 16.

In the present embodiment, an arrangement of the instrument hole 16 on the support structure 1 is provided.

In one embodiment, the crystal structure 11 on the sidewall of the support structure 1 extends towards the central hole 15 and meets the central hole 15.

In the present embodiment, a set relationship between the crystal structure 11 and the central hole 15 is provided. In addition, the through hole 112 will also pass the outer wall of the support structure 1 through said central hole 15.

In one embodiment, the first end surface 12 and the second end surface 13 form an included angle θ therebetween.

In the embodiment, an arrangement relationship between the first end face 12 and the second end face 13 is provided, and since the human vertebrae have physiological curvature, the first end face 12 and the second end face 13 are not two planes parallel to each other, but are located on an extending plane to form an included angle, i.e. a spatial included angle θ. The preferred range of the spatial angle θ is 0 to 7 degrees.

In one embodiment, the profile of the side wall of the support structure 1 is rounded in a circular arc transition.

In this embodiment, rounded transitions are necessary for the outer contour of the cage, since the cage will eventually be implanted in the body.

In addition, the support structure 1 can be understood as a rectangular structure, the upper end surface and the lower end surface of the support structure are the first end surface 12 and the second end surface 13, one side surface of the side walls of the support structure 1 is a curved surface with a convex middle part and two bent sides. The instrument hole 16 is arranged on the curved surface, and the opening direction of the space angle theta between the first end surface 12 and the second end surface 13 faces the direction of the curved surface.

Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not explicitly recited in the present application. In particular, the features recited in the various embodiments and/or claims of the present application may be combined and/or coupled in various ways, all of which fall within the scope of the present disclosure, without departing from the spirit and teachings of the present application.

Has the beneficial effects that:

the elastic modulus of the crystal structure 11 arranged on the interbody fusion cage is close to that of human bones, so that stress shielding can be avoided. The protrusion 14 can be fitted to the upper and lower surfaces of the cervical joint to prevent horizontal slippage; the through-hole 112 facilitates bone in-growth and bone fusion.

The crystal structure is 11, the aperture is 100um-1500um, and the porosity reaches 5-90%; through holes are distributed on three sides of the side surface of the intervertebral fusion device, one side with an instrument hole 16 is provided, and the crystal structure 11 extends to two sides of the instrument hole 16.

The crystal structure 11 part of the interbody fusion cage can be filled with different crystal lattices, and the cost is low. The bone is not required to be implanted, and the trauma is reduced.

The principles and embodiments of the present invention have been explained herein using specific embodiments, and the above description of the embodiments is only for the purpose of facilitating understanding the method and the core idea of the present invention, and is not intended to limit the present application. It will be appreciated by those skilled in the art that changes may be made in this embodiment and its broader aspects and without departing from the principles and spirit of the invention, and that all modifications, equivalents, and improvements made thereto are intended to be embraced within the scope of the invention.

Claims

1. An intervertebral cage, comprising: a support structure (1);

a crystal structure (11) is distributed on the supporting structure (1);

the crystal structure (11) is constructed by connecting rods (111) overlapping each other in space, and through holes (112) are formed by gaps between the connecting rods (111).

2. The intersomatic cage according to claim 1, characterized in that the through-holes (112) are arranged in layers.

3. Intervertebral cage according to claim 1, characterized in that the support structure (1) has a first end face (12) and a second end face (13) at both ends of the support structure (1), the crystal structure (11) being arranged on a side wall between the first end face (12) and the second end face (13).

4. An intersomatic cage according to claim 3, characterized in that a plurality of projections (14) are arranged on the first end face (12) and/or the second end face (13), respectively.

5. Intervertebral cage according to claim 4, characterized in that the projections (14) are connected to the first (12) and/or second (13) end face with a gradually decreasing cross-sectional area from one end to the other.

6. Intervertebral cage according to claim 3, characterized in that the first end face (12) and the second end face (13) are arranged opposite on the support structure (1), the support structure (1) being provided with a central hole (15) passing through the first end face (12) and the second end face (13).

7. Intersomatic cage according to claim 6, characterized in that an instrument hole (16) is provided on the side of the support structure (1) between the first end face (12) and the second end face (13), the central hole (15) communicating externally with the side of the support structure (1) through the instrument hole (16).

8. Intervertebral cage according to claim 6, characterized in that the crystal structure (11) on the side walls of the support structure (1) extends in the direction of the central hole (15) and adjoins the central hole (15).

9. An intersomatic cage according to claim 3, characterized in that the first end face (12) and the second end face (13) form an angle (θ) in space therebetween.

10. The intersomatic cage according to claim 3, characterized in that the lateral wall profile of the support structure (1) is rounded in the transition.