Self-stabilizing fusion cage with titanium end plate

Abstract

The invention belongs to the technical field of medical instruments, and relates to a self-stabilizing fusion cage with titanium end plates, the self-stabilizing fusion cage comprises a fusion cage body and anchoring elements arranged on the upper side and the lower side of the fusion cage body, the fusion cage body comprises two titanium end plate layers which are symmetrically arranged up and down, and a PEEK center layer which is cooperatively connected between the two titanium end plate layers, a mounting hole matched with the anchoring element is formed in the right end of the fusion cage body, the anchoring element obliquely extends towards the upper side or the lower side of the fusion cage body through the mounting hole, and a limiting piece matched with the right end of the anchoring element is arranged in the mounting hole and used for preventing the anchoring element from moving left and right after being mounted in place. According to the invention, osseointegration with bones can be realized, vertebral fusion is facilitated, and the vertebral fusion condition can be observed through imaging after an operation; meanwhile, better holding force can be obtained, and the fusion effect is further improved.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a self-stabilizing fusion device with a titanium endplate. Background Technology

[0002] Fusion devices are mainly divided into two categories based on their materials: one is made of PEEK material, and the other is made of titanium material.

[0003] PEEK fusion cages are X-ray oriented, facilitating postoperative imaging monitoring of fusion. Furthermore, PEEK has an elastic modulus closer to bone, which improves stress transmission and reduces the risk of cage subsidence. However, PEEK is a bioinert material and cannot integrate with bone. Additionally, PEEK is less strong than titanium, resulting in lower holding force on metal anchoring elements when used in self-stabilizing fusion cages.

[0004] Titanium fusion cages can integrate with bone, which is beneficial for spinal fusion. Furthermore, titanium has high mechanical strength, especially when used to fabricate self-stabilizing fusion cages, providing good holding force for metal anchoring elements. However, its X-ray impermeability hinders postoperative imaging examination of fusion status. Therefore, there is a need for a self-stabilizing fusion cage that can address these issues. Summary of the Invention

[0005] The purpose of this invention is to address the defects and shortcomings of existing technologies by designing a self-stabilizing fusion device with a titanium end plate that combines the advantages of both PEEK and titanium fusion devices while avoiding their disadvantages.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a self-stabilizing fusion device with titanium end plates, comprising a fusion device body and anchoring elements disposed on the upper and lower sides of the fusion device body. The fusion device body includes two titanium end plate layers symmetrically arranged vertically, and a PEEK center layer connected between the two titanium end plate layers. The right end of the fusion device body has a mounting hole that mates with the anchoring elements. The anchoring elements extend obliquely towards the upper or lower side of the fusion device body through the mounting hole, and the mounting hole has a limiting member that mates with the right end of the anchoring elements to prevent the anchoring elements from moving left and right after installation.

[0007] Preferably, the PEEK center layer is disposed between the two titanium end plates by injection molding or interference fit.

[0008] Preferably, the two anchoring elements are respectively connected to two titanium end plates, and both the anchoring elements and the titanium end plates are made of titanium or titanium alloy.

[0009] Preferably, the anchoring element is arc-shaped and bends from right to left away from the fusion unit body.

[0010] Preferably, the anchoring element has two anti-retraction hooks at the front and rear, and the orientation of the anti-retraction hooks is opposite to the extension direction of the anchoring element.

[0011] Preferably, the upper and lower surfaces of the fusion body are provided with a first tooth-shaped structure, and the cross-section of the first tooth-shaped structure is triangular.

[0012] Preferably, the fusion body has a hollow groove extending through its upper and lower surfaces, and the hollow groove has a middle beam connecting its front and rear side walls, and the upper and lower surfaces of the middle beam do not protrude from the upper and lower surfaces of the fusion body.

[0013] Preferably, the front and rear sides of the fusion body also have through holes communicating with the hollow groove.

[0014] Preferably, the upper and lower surfaces of the left end of the fusion body are designed to be inclined from right to left towards each other, and both the upper and lower surfaces of the left end of the fusion body are provided with a second tooth-shaped structure consistent with the inclination direction of their respective surfaces.

[0015] Preferably, the right end of the fusion unit body also has a clamping groove.

[0016] After adopting the above technical solution, the self-stabilizing fusion device with titanium end plate provided by the present invention has the following beneficial effects: This invention, through the design of the upper and lower titanium endplate layers, enables osseointegration with bone, facilitating vertebral fusion; through the design of the PEEK central layer, it facilitates postoperative imaging observation of vertebral fusion; and through the design of connecting anchoring elements to the titanium endplate layers, it achieves better holding force, while also facilitating implantation and providing anti-retrogression function, further improving the fusion effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a self-stabilizing fusion device with a titanium end plate according to the present invention; Figure 2 This is a schematic diagram of the structure of the fusion device body in this invention; Figure 3 This is a top view of the fusion device body in this invention; Figure 4 for Figure 3 Middle AA side sectional view; Figure 5 This is a side view of the fusion device body in this invention.

[0018] The components include: 1. Fusion body; 2. Anchoring element; 3. Titanium end plate layer; 4. PEEK center layer; 5. Mounting hole; 6. Limiting component; 7. Anti-retraction hook; 8. First tooth-shaped structure; 9. Hollow groove; 10. Intermediate beam; 11. Through hole; 12. Second tooth-shaped structure; 13. Clamping groove. Detailed Implementation

[0019] The present invention will now be described more clearly and completely with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0023] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0025] This invention provides a self-stabilizing fusion device with a titanium end plate, such as... Figure 1-5 As shown, the device includes a fusion assembly body 1 and anchoring elements 2 disposed on the upper and lower sides of the fusion assembly body 1. The fusion assembly body 1 includes two titanium end plates 3 symmetrically arranged vertically, and a PEEK center layer 4 connected between the two titanium end plates 3. The PEEK center layer 4 is disposed between the two titanium end plates 3 by injection molding or interference fit. The two anchoring elements 2 are respectively connected to the two titanium end plates 3, and both the anchoring elements 2 and the titanium end plates 3 are made of titanium or titanium alloy. Specifically, the right end of the fusion assembly body 1 has a mounting hole 5 that mates with the anchoring element 2. The anchoring element 2 is inclined towards the upper or lower side of the fusion assembly body 1 through the mounting hole 5. The extension means that the mounting hole 5 connects two channels. One channel slopes upward to the left and passes through the upper side of the fusion body 1, while the other channel slopes downward to the left and passes through the lower side of the fusion body 1. Two anchoring elements 2 are respectively set in the two channels, and the anchoring elements 2 are arc-shaped, bending from right to left away from the fusion body 1. In order to prevent the anchoring elements 2 from moving left and right after installation, the mounting hole 5 has a limiting member 6 that cooperates with the right end of the anchoring element 2. In order to facilitate the insertion of the anchoring element 2 and ensure the anti-retraction effect of the anchoring element 2, the front and rear of the anchoring element 2 have anti-retraction hooks 7, and the orientation of the anti-retraction hooks 7 is opposite to the extension direction of the anchoring element 2.

[0026] Furthermore, in order to increase the friction and contact area between the fusion device body 1 and the lumbar vertebrae, the upper and lower surfaces of the fusion device body 1 are provided with a first tooth-shaped structure 8. The cross-section of the first tooth-shaped structure 8 is triangular, and the bottom of the first tooth-shaped structure 8 has an arc-shaped groove. The fusion device body 1 has a hollow groove 9 that runs through its upper and lower surfaces. In order to increase the support stability of the fusion device body 1, the hollow groove 9 has a middle beam 10 connecting its front and rear side walls. The upper and lower surfaces of the middle beam 10 do not protrude from the upper and lower surfaces of the fusion device body 1. The front and rear sides of the fusion device body 1 also have through holes 11 that communicate with the hollow groove 9. In order to improve the implantation guidance of the fusion device body 1, the upper and lower surfaces of the left end of the fusion device body 1 are designed to be inclined from right to left towards each other. The upper and lower surfaces of the left end of the fusion device body 1 are provided with a second tooth-shaped structure 12 that is consistent with the inclination direction of their respective surfaces. The right end of the fusion device body 1 also has a clamping groove 13.

[0027] In summary, the self-stabilizing fusion device with titanium endplates provided by this invention, through the design of the upper and lower titanium endplate layers, can achieve osseointegration with the bone, which is conducive to vertebral fusion; through the design of the PEEK central layer, it is convenient to observe the vertebral fusion status through imaging after surgery; and through the design of connecting anchoring elements on the titanium endplate layers, better holding force can be obtained. At the same time, it is easy to implant and has an anti-retrogression function, which can further improve the fusion effect. It has great market value and is worthy of widespread promotion and application.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A self-stabilizing fusion device with a titanium end plate, characterized in that: The device includes a fusion body (1) and anchoring elements (2) disposed on the upper and lower sides of the fusion body (1). The fusion body (1) includes two titanium end plates (3) symmetrically arranged on the upper and lower sides, and a PEEK center layer (4) connected between the two titanium end plates (3). The right end of the fusion body (1) has a mounting hole (5) that cooperates with the anchoring element (2). The anchoring element (2) extends obliquely to the upper or lower side of the fusion body (1) through the mounting hole (5). The mounting hole (5) has a limiting member (6) that cooperates with the right end of the anchoring element (2) to prevent the anchoring element (2) from moving left and right after it is installed in place.

2. The self-stabilizing fusion device with a titanium end plate according to claim 1, characterized in that: The PEEK center layer (4) is disposed between the two titanium end plate layers (3) by injection molding or interference fit.

3. The self-stabilizing fusion device with a titanium end plate according to claim 1, characterized in that: The two anchoring elements (2) are respectively connected to the two titanium end plates (3), and both the anchoring elements (2) and the titanium end plates (3) are made of titanium or titanium alloy.

4. A self-stabilizing fusion device with a titanium end plate according to claim 1, characterized in that: The anchoring element (2) is arc-shaped and bends from right to left away from the fusion body (1).

5. A self-stabilizing fusion device with a titanium end plate according to claim 1, characterized in that: The anchoring element (2) has two anti-retraction hooks (7) at the front and back, and the orientation of the anti-retraction hooks (7) is opposite to the extension direction of the anchoring element (2).

6. A self-stabilizing fusion device with a titanium end plate according to claim 1, characterized in that: The upper and lower surfaces of the fusion body (1) are provided with a first tooth structure (8), and the cross section of the first tooth structure (8) is triangular.

7. A self-stabilizing fusion device with a titanium end plate according to claim 1, characterized in that: The fusion body (1) has a hollow groove (9) that runs through its upper and lower surfaces. The hollow groove (9) has a middle beam (10) that connects its front and rear side walls. The upper and lower surfaces of the middle beam (10) do not protrude from the upper and lower surfaces of the fusion body (1).

8. A self-stabilizing fusion device with a titanium end plate according to claim 7, characterized in that: The front and rear sides of the fusion body (1) also have through holes (11) that communicate with the hollow groove (9).

9. A self-stabilizing fusion device with a titanium end plate according to claim 1, characterized in that: The upper and lower surfaces of the left end of the fusion body (1) are designed to be inclined from right to left towards each other, and the upper and lower surfaces of the left end of the fusion body (1) are provided with a second tooth structure (12) that is consistent with the inclination direction of their respective surfaces.

10. A self-stabilizing fusion device with a titanium end plate according to claim 1, characterized in that: The right end of the fusion body (1) also has a clamping groove (13).

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