Interbody fusion cage

Abstract

The invention discloses an interbody fusion cage, and relates to the field of orthopedic medical instruments. Comprising a solid region and a porous structure region, the entity area comprises an upper end face, a lower end face and an instrument groove. The porous structure area is arranged on the outer surface and inside the interbody fusion cage; the porous structure area is a pore structure formed by a plurality of rods and provided with a plurality of through holes. The interbody fusion cage is not provided with a bone grafting bin, the porous structure areas are distributed on the outer surface and in the interbody fusion cage, the bone fusion area is increased, bone ingrowth is better facilitated, meanwhile, the porous structure has good mechanical performance, the elastic modulus of a product is reduced, enough mechanical support is provided, and the bone grafting effect is improved. And the capability of preventing the fusion cage from falling off is improved.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to an intervertebral fusion device. Background Technology

[0002] Interbody fusion cages, as intervertebral replacement devices in orthopedic surgery, have matured after years of development. Traditional interbody fusion cages typically include a bone graft chamber. The size of the bone graft chamber determines the area of ​​early bone ingrowth. If the chamber is too large, the contact area between the interbody fusion cage endplate and the adjacent vertebrae is too small, easily leading to problems such as loosening, collapse, and non-fusion, thus imposing a financial burden on the patient.

[0003] In interbody fusion surgery with a bone graft chamber, doctors need to extract the patient's own bone or use allogeneic bone graft material. Taking the patient's own bone will cause greater trauma, and using allogeneic bone will incur additional costs, making the surgery more expensive. Eliminating the bone graft chamber can simplify the surgical procedure, reduce the operation time, reduce the probability of surgical errors, and reduce the risk of intraoperative infection. Summary of the Invention

[0004] To address the aforementioned problems, this application provides an interbody fusion device;

[0005] The intervertebral fusion device provided by the present invention includes a solid region (1) and a porous structure region (2); the solid region (1) includes an upper end face (3), a middle part (4) and a lower end face (5); the porous structure region (2) is disposed on the outer surface and inside of the intervertebral fusion device; wherein the porous structure region (2) is formed by filling and stacking multiple pore structures (6).

[0006] Furthermore, the intervertebral fusion device as described in claim 1 is characterized in that the pore structure (6) is formed by filling and stacking multiple connecting rods (7), and through holes (8) are formed between adjacent connecting rods (7). The through holes (8) are polygonal structures, and the pore structure (6) is randomly distributed or distributed according to a preset geometric shape.

[0007] Furthermore, the intervertebral fusion device as described in claim 2 is characterized in that the middle part includes a body sidewall (9), the body sidewall (9) has an axially arranged support column (10), and the support column (10) is connected to the pore structure (6).

[0008] Furthermore, the intervertebral fusion device as described in claim 3 is characterized in that a first protrusion (11) and a second protrusion (12) are respectively provided on the upper end face and the lower end face.

[0009] Furthermore, the intervertebral fusion device as described in claim 4 is characterized in that the porosity of the porous structure region (2) is 60-95%, and the diameter of the through hole (8) is 100-1000um.

[0010] Furthermore, in the intervertebral fusion device as described in claim 5, the connecting rod (7) includes a straight rod structure and a bent rod structure.

[0011] Furthermore, the intervertebral fusion device as described in claim 6 is characterized in that the solid region (1) and the porous structure region (2) are integrally printed by 3D printing material, wherein the 3D printing material includes metal, polymer, and ceramic.

[0012] Furthermore, the interbody fusion device as described in claim 7 is characterized in that an instrument groove (13) is provided on the side wall (9) of the main body.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0014] The interbody fusion device of the present invention does not have a bone graft chamber. The pores in the porous structure area provide a bone ingrowth channel, which effectively increases the bone fusion area, reduces the product's elastic modulus, reduces the product's production cost, and also reduces surgical trauma and economic burden for patients. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the interbody fusion device from the front in one embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the overall structure of the interbody fusion device in one embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the overall structure of the back of the interbody fusion device in one embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the overall structure of the interbody fusion device in another embodiment of the present invention;

[0019] The reference numerals in the attached figures are as follows: 1. Solid area; 2. Porous structure area; 3. Upper end face; 4. Middle part; 5. Lower end face; 6. Porous structure; 7. Connecting rod; 8. Through hole; 9. Body sidewall; 10. Support column; 11. First protrusion; 12. Second protrusion; 13. Instrument groove. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the interbody fusion device of the present invention. Figure 2 This is a schematic diagram of the overall structure of the interbody fusion device in one embodiment of the present invention. Figure 3 This is a schematic diagram of the overall structure of the back of the interbody fusion device in one embodiment of the present invention. Figure 1 and Figure 2 , Figure 3 As shown, in one embodiment, this application provides an intervertebral fusion device, including a solid region (1) and a porous structure region (2); the solid region (1) includes an upper end face (3), a middle part (4), and a lower end face (5); the porous structure region (2) is distributed on the outer surface and inside of the intervertebral fusion device, wherein the porous structure region (2) is formed by filling and stacking multiple pore structures (6).

[0022] In this embodiment, a specific structure of an intervertebral fusion device 1 is provided. The pore structure (6) is formed by filling and stacking multiple connecting rods (7). A through hole (8) is formed between adjacent connecting rods (7). The through hole (8) is a polygonal structure. The pore structure (6) is randomly distributed or distributed according to a preset geometric shape.

[0023] The middle part includes a body sidewall (9), which has an axially arranged support column (10) connected to the pore structure (6).

[0024] A first protrusion (11) and a second protrusion (12) are respectively provided on the upper end face and the lower end face.

[0025] The porosity of the porous structure region (2) is 60-95%, and the diameter of the through hole (8) is 100-1000um.

[0026] The solid region (1) and the porous structure region (2) are formed by 3D printing.

[0027] An instrument slot (13) is provided on the side wall (9) of the main body.

[0028] In clinical practice, the upper end face 3 and the lower end face 5 support the vertebrae in the vertical direction, and the porous structure area (2) is multiple, arranged around the side of the intervertebral fusion device and filled inside the intervertebral fusion device, so that the intervertebral fusion device does not have a bone graft chamber structure.

[0029] The central part has an axially arranged support column (10) to ensure the strength of the side wall (9) of the intervertebral fusion device. The support column (10) can adjust the width of the central part (4) of the intervertebral fusion device according to the structural strength requirements of the intervertebral fusion device.

[0030] The porous structure region 2 is distributed on the outer surface and inside of the interbody fusion device. The upper end face 3 and the lower end face 5 are provided with a first protrusion 11 and a second protrusion 12. The upper end face 3 and the lower end face 5 are attached to the surfaces of the upper and lower vertebrae. The first protrusion 11 and the second protrusion 12 provide initial stability after the interbody fusion device is implanted into the human body.

[0031] The intervertebral fusion device is molded in one piece and can be manufactured using 3D printing. It is made of titanium alloy, which has good biocompatibility and support strength.

[0032] An instrument slot (13) is provided on the side wall (9) of the main body. This embodiment provides a specific structure for the fusion device with the instrument slot 13, which is used to cooperate with surgical instruments for clinical surgery. To better connect with external instruments, the external instruments are used to place the intervertebral fusion device between the upper and lower vertebrae. The instrument slot (13) is also provided on the side wall (9) of the main body of the intervertebral fusion device, and the instrument slot (13) is positioned facing inwards towards the interior of the intervertebral fusion device so that the outer surface of the intervertebral fusion device communicates with the interior. Furthermore, the instrument slot (13) is mostly a threaded hole for better connection with the external instruments.

[0033] Figure 4 This is a schematic diagram of the overall structure of the interbody fusion device in another embodiment of the present invention. The porosity of the porous structure region (2) is 60-95%, and the diameter of the through hole (8) is 100-1000 μm. The through hole (8) supports bone ingrowth in different directions, resulting in good bone ingrowth effect.

[0034] The beneficial effects of this invention are:

[0035] This invention is the first to propose the concept of a bone graft-free interbody fusion device. The pores in the porous structure area provide a bone ingrowth channel, effectively increasing the bone fusion area, reducing the product's elastic modulus, reducing product production costs, and also alleviating surgical trauma and economic burden for patients.

[0036] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this application. In particular, without departing from the spirit and teachings of this application, the features described in the various embodiments and / or claims of this application can be combined and / or combined in various ways, and all such combinations and / or combinations fall within the scope of this application.

[0037] This document uses specific embodiments to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely illustrative of the method and core concepts of the present invention and are not intended to limit this application. Those skilled in the art can make changes to the specific implementation methods and application scope based on the ideas, spirit, and principles of the present invention. Any modifications, equivalent substitutions, or improvements made should be included within the scope of protection of this application.

Claims

1. An interbody fusion device, characterized in that, It includes a solid region (1) and a porous structure region (2); the solid region (1) includes an upper end face (3), a middle part (4), and a lower end face (5); the porous structure region (2) is disposed on the outer surface and inside of the intervertebral fusion device; The porous structure region (2) is formed by filling and stacking multiple pore structures (6).

2. The interbody fusion device as described in claim 1, characterized in that, The pore structure (6) is formed by filling and stacking multiple connecting rods (7), and through holes (8) are formed between adjacent connecting rods (7). The through holes (8) are polygonal structures, and the pore structures (6) are randomly distributed or distributed according to a preset geometric shape.

3. The interbody fusion device as described in claim 2, characterized in that, The middle part (4) includes a body sidewall (9), which has an axially arranged support column (10) connected to the pore structure (6).

4. The interbody fusion device as described in claim 3, characterized in that, A first protrusion (11) and a second protrusion (12) are respectively provided on the upper end face and the lower end face.

5. The interbody fusion device as described in claim 4, characterized in that, The porosity of the porous structure region (2) is 60-95%, and the diameter of the through hole (8) is 100-1000um.

6. The interbody fusion device as described in claim 5, characterized in that, The connecting rod (7) includes a straight rod structure and a bent rod structure.

7. The interbody fusion device as described in claim 6, characterized in that, The solid region (1) and the porous structure region (2) are integrally printed by 3D printing material, which includes metal, polymer and ceramic.

8. The interbody fusion device as described in claim 7, characterized in that, An instrument slot (13) is provided on the side wall (9) of the main body.

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