Fusion cage

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a fusion cage. The fusion cage comprises a shell and a covering part, a containing cavity used for containing an implanted bone is formed in the shell, a first communication opening and a second communication opening are formed in the two faces, used for abutting against two vertebral bodies, of the shell respectively, and the containing cavity is communicated with the external environment through the first communication opening and the second communication opening; the covering part is rotationally arranged on the shell, the covering part is provided with a third communication port, and supporting structures are arranged between the port walls of the second communication port and the third communication port; the covering part and the first communication port are correspondingly arranged, and when the covering part rotates to the first position, the first communication port is opened; when the covering part rotates to the second position, the first communication opening is closed, and the first communication opening communicates with the third communication opening. Due to the arrangement of the supporting structure, the strength stability of the fusion cage is good, meanwhile, the space for placing the grafted bone is large, and then the fusion effect of the fusion cage in the using process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a fusion device. Background Art

[0002] The spine is an important supporting structure of the human body, which is composed of multiple vertebrae connected by intervertebral discs and ligaments. Among them, spinal fusion is a common spinal surgery mainly used to treat diseases such as spinal instability, spondylolisthesis, and spinal tumors. A fusion device is a commonly used spinal fusion surgical instrument, and its main function is to form a stable support between two vertebral bodies of the spine to promote spinal fusion. In the field of orthopedic medical devices, various types of intervertebral fusion devices are widely used in clinical practice to meet different surgical needs.

[0003] The fusion device is usually made of titanium alloy, polyetheretherketone (PEEK), etc. into an integral body. To improve the fusion effect, a cavity part is generally provided in the fusion device, and bone grafting is performed in the cavity during the operation. At the same time, in order to ensure the mechanical properties such as the strength of the fusion device, the bone grafting cavity is relatively small. Therefore, the amount of bone grafting during the operation is small, which may affect the surgical fusion. Therefore, how to design a fusion device that can not only provide strength stability but also improve the fusion effect is an urgent problem to be solved currently. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a fusion device, so that the fusion device has good strength stability, and at the same time, the space for placing bone grafts is large, thereby improving the fusion effect during the use of the fusion device.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] Provide a fusion device that can abut between two vertebral bodies of the spine, and the fusion device includes:

[0007] A housing, a placement cavity for placing bone grafts is provided in the housing, and a first communication port and a second communication port are respectively provided on two surfaces of the housing for abutting against the two vertebral bodies, and the placement cavity is communicated with the external environment through the first communication port and the second communication port;

[0008] A covering member is rotatably provided on the housing, the covering member is provided with a third communication port, and a support structure is provided between the respective port walls of the second communication port and the third communication port; the covering member is correspondingly arranged with the first communication port. When the covering member rotates to the first position, the first communication port is opened; when the covering member rotates to the second position, the first communication port is closed, and the first communication port is communicated with the third communication port.

[0009] Preferably, the fuser further includes a connecting member. The housing is provided with a first connection hole, and the covering member is provided with a second connection hole. One end of the connecting member passes through the first connection hole, and the other end passes through the second connection hole.

[0010] Preferably, the connecting member is configured as a rotating pin.

[0011] Preferably, the connecting member is in interference fit with the first connection hole and in clearance fit with the second connection hole.

[0012] Preferably, one of the housing and the covering member is provided with a clamping groove, and the other is provided with a clamping protrusion. When the covering member rotates to the second position, the clamping protrusion is clamped with the clamping groove.

[0013] Preferably, the housing is provided with a boss, and the covering member is provided with an avoidance groove. When the covering member rotates to the second position, the boss is placed in the avoidance groove. The clamping protrusion is provided on one of the boss and the avoidance groove, and the clamping groove is provided on the other.

[0014] Preferably, the support structure is configured as a mesh structure.

[0015] Preferably, the support structure and the housing are integrally formed.

[0016] Preferably, auxiliary communication ports are provided on two opposite side walls of the housing perpendicular to the first communication port. The auxiliary communication ports are used to assist in communicating the placement cavity and the external environment.

[0017] Preferably, the support structure is provided between the walls of each of the auxiliary communication ports.

[0018] Advantages of the present utility model:

[0019] The present utility model provides a fusion device, which includes a housing and a covering member. A placement cavity in the housing is provided with a first communication port and a second communication port. The placement cavity is communicated with the external environment through the first communication port and the second communication port, so that the bone graft in the placement cavity can be fused with the vertebral body; the covering member is provided with a third communication port, and a support structure is provided between the respective port walls of the second communication port and the third communication port; the covering member is arranged corresponding to the first communication port. When the covering member rotates to the first position, the first communication port is opened; when the covering member rotates to the second position, the first communication port is closed, and the first communication port is communicated with the third communication port. At this time, the fusion device can be placed between two vertebral bodies. The covering member is rotatably arranged, so that when the covering member rotates to the first position, the bone graft can be placed in the placement cavity through the first communication port, and when the covering member rotates to the second position, the fusion device can be placed between two vertebral bodies for a fusion operation. The setting of the support structure improves the overall strength of the fusion device while ensuring the communication between the placement cavity and the external environment, making the fusion device more stable during use. The upper and lower surfaces of the fusion device can abut against the end plates of the vertebral body, and the left and right side walls are used for fusing with the external bone graft. The fusion can be carried out with the bone graft in both the up-and-down and left-and-right directions. The framework formed by the support structure and the housing provides a larger space for placing the bone graft, increasing the contact area between the bone graft and the fusion device. Therefore, the fusion effect and the fusion rate are improved, and during the process of implanting the fusion device into the human body, the covering member and the support structure also play a role in protecting the bone graft in the housing. Description of the Drawings

[0020] Figure 1 is a schematic structural view of the fusion device provided by an embodiment of the present utility model;

[0021] Figure 2 is another view of the fusion device provided by an embodiment of the present utility model;

[0022] Figure 3 is a partial cross-sectional view of the card slot, card protrusion, first connection hole and second connection hole of the fusion device provided by an embodiment of the present utility model;

[0023] Figure 4 is a side view of the fusion device provided by an embodiment of the present utility model;

[0024] Figure 5 is a partial cross-sectional view of the first connection hole of the housing provided by an embodiment of the present utility model;

[0025] Figure 6 is a cross-sectional view of the housing provided by an embodiment of the present utility model;

[0026] Figure 7 is a partial cross-sectional view of the card slot and the second connection hole on the covering member provided by an embodiment of the present utility model;

[0027] Figure 8It is a side view of the covering provided by the embodiment of the present utility model;

[0028] Figure 9 It is a cross-sectional view of the covering in the fuser provided by the embodiment of the present utility model when the covering rotates to the first position;

[0029] Figure 10 It is a cross-sectional view of the covering in the fuser provided by the embodiment of the present utility model when the covering rotates to the second position.

[0030] In the figure:

[0031] 1. Housing; 11. Placing cavity; 12. First connection hole; 13. Clamping projection; 14. Boss; 15. Second communication port; 16. Auxiliary communication port; 17. First communication port;

[0032] 2. Covering; 21. Second connection hole; 22. Card slot; 23. Avoidance groove; 24. Third communication port;

[0033] 3. Support structure;

[0034] 4. Connecting piece. Detailed implementation manners

[0035] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are merely for explaining the present utility model and not for limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0036] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may also include the case where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] As Figures 1 to 10 shown, this embodiment provides a fusion device that can abut between two vertebral bodies of the spine. During spinal internal fixation surgery, the fusion device is implanted between the diseased vertebral bodies to replace the intervertebral disc, so as to provide the height and stability of the spine, thereby promoting the healing of the spine. In some embodiments, the fusion device includes a housing 1 and a covering member 2. A placement cavity 11 for placing bone graft is provided in the housing 1. A first communication port 17 and a second communication port 15 are respectively provided on the side walls of the housing 1 for abutting against the two vertebral bodies. The placement cavity 11 communicates with the external environment through the first communication port 17 and the second communication port 15. The covering member 2 is rotatably provided on the housing 1. The covering member 2 is provided with a third communication port 24. A support structure 3 is provided between the respective port walls of the second communication port 15 and the third communication port 24. The covering member 2 is correspondingly arranged with the first communication port 17. When the covering member 2 rotates to the first position, the first communication port 17 is opened. When the covering member 2 rotates to the second position, the first communication port 17 is closed, and the first communication port 17 communicates with the third communication port 24.

[0040] The placement cavity 11 inside the housing 1 is provided with a first communication port 17 and a second communication port 15. The placement cavity 11 is in communication with the external environment through the first communication port 17 and the second communication port 15, enabling the bone graft placed in the placement cavity 11 to fuse with the vertebral body; the covering member 2 is provided with a third communication port 24, and a support structure 3 is provided between the respective port walls of the second communication port 15 and the third communication port 24; the covering member 2 is correspondingly arranged with the first communication port 17. When the covering member 2 rotates to the first position, the first communication port 17 is opened; when the covering member 2 rotates to the second position, the first communication port 17 is closed, and the first communication port 17 is in communication with the third communication port 24. At this time, the fusion device can be placed between two vertebral bodies. The covering member 2 is rotatably arranged such that when the covering member 2 rotates to the first position, the bone graft can be placed in the placement cavity 11 through the first communication port 17, and when the covering member 2 rotates to the second position, the fusion device can be placed between two vertebral bodies for a fusion operation. The setting of the support structure 3 enhances the overall strength of the fusion device while ensuring the communication between the placement cavity 11 and the external environment, making the fusion device more stable during use. The upper and lower surfaces of the fusion device can abut against the end plates of the vertebral body, and the left and right side walls are used for fusing with the external bone graft. The fusion can be carried out with the bone graft in both the up-down and left-right directions, providing a larger space for the bone graft to be placed and increasing the contact area between the bone graft and the side walls of the fusion device. Therefore, the fusion effect and fusion rate are improved, and during the process of implanting the fusion device into the human body, the covering member 2 and the support structure 3 also play a role in protecting the bone graft inside the housing 1.

[0041] Preferably, in order to make the support effect of the support structure 3 better, the support structure 3 is configured as a mesh structure.

[0042] Preferably, in order to enhance the strength stability of the overall fusion device, the support structure 3 and the housing 1 are integrally formed. In this embodiment, the support structure 3 and the housing 1 are integrally formed by 3D printing technology; the support structure 3 and the covering member 2 are also integrally formed by 3D printing technology. Using 3D printing technology, customized design can be achieved, and various specifications can meet the needs of different patients.

[0043] To facilitate the rotational connection of the covering member 2 to the housing 1, the fusion device further includes a connecting member 4. The housing 1 is provided with a first connection hole 12, and the covering member 2 is provided with a second connection hole 21. One end of the connecting member 4 passes through the first connection hole 12, and the other end passes through the second connection hole 21. The connecting member 4 connects the covering member 2 and the housing 1 by passing through the first connection hole 12 and the second connection hole 21. Specifically, the connecting member 4 is configured as a rotating pin.

[0044] Specifically, in order to ensure the rotation function of the covering member 2, the connecting member 4 is in interference fit with the first connection hole 12 and in clearance fit with the second connection hole 21.

[0045] When the covering member 2 rotates to the second position, the covering member 2 can be relatively fixed to the housing 1, so that the fusion device is more stable during use. One of the housing 1 and the covering member 2 is provided with a card slot 22, and the other is provided with a card projection 13. When the covering member 2 rotates to the second position, the card projection 13 is engaged with the card slot 22. In this embodiment, the card projection 13 is provided on the housing 1, and the card slot 22 is provided on the covering member 2.

[0046] Further, in order to facilitate the setting of the card projection 13 and the card slot 22, the housing 1 is provided with a boss 14, and the covering member 2 is provided with an avoidance groove 23. When the covering member 2 rotates to the second position, the boss 14 is placed in the avoidance groove 23, and the card projection 13 is provided on one of the boss 14 and the avoidance groove 23, and the card slot 22 is provided on the other. The setting of the avoidance groove 23 and the boss 14 makes the overall fusion device more stable and has better matching after the covering member 2 is docked with the housing 1. In this embodiment, the card projection 13 is provided on the boss 14, and the card slot 22 is provided on the wall of the avoidance groove 23.

[0047] Auxiliary communication ports 16 are provided on two opposite side walls of the housing 1 perpendicular to the first communication port 17. The auxiliary communication ports 16 are used to assist in communicating the placement cavity 11 and the external environment. The auxiliary communication ports 16 further increase the space for bone graft placement in the placement cavity 11, which is beneficial to improving the fusion effect and fusion rate.

[0048] Further, a support structure 3 is provided between the walls of each of the auxiliary communication ports 16. This further improves the overall strength of the fusion device, making the fusion device more stable during use, and increasing the contact area between the bone graft and the side wall of the fusion device. Therefore, the space for bone graft placement is larger, improving the fusion effect and fusion rate. In addition, the design of the auxiliary communication ports 16 and the support structure 3 reduces the amount of material used in the overall fusion device, improves the radiographic fluoroscopy performance, and there are fewer artifacts during imaging.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fusion device that can abut between two vertebral bodies of the spine, characterized in that The fusion device includes: A housing (1) having a placement cavity (11) for placing bone grafts therein. On two opposite surfaces of the housing (1) for abutting against the two vertebral bodies, a first communication port (17) and a second communication port (15) are respectively provided, and the placement cavity (11) communicates with the external environment through the first communication port (17) and the second communication port (15); A covering member (2) rotatably provided on the housing (1). The covering member (2) is provided with a third communication port (24), and a support structure (3) is provided between the respective port walls of the second communication port (15) and the third communication port (24); The covering member (2) is correspondingly arranged with the first communication port (17). When the covering member (2) rotates to the first position, the first communication port (17) is opened; When the covering member (2) rotates to the second position, the first communication port (17) communicates with the third communication port (24).

2. The fuser according to claim 1, wherein, The fusion device further includes a connecting member (4). The housing (1) is provided with a first connection hole (12), and the covering member (2) is provided with a second connection hole (21). One end of the connecting member (4) passes through the first connection hole (12), and the other end passes through the second connection hole (21).

3. The fusion device according to claim 2, characterized in that, The connecting member (4) is configured as a rotating pin.

4. The fusion device according to claim 2, wherein The connecting member (4) is in interference fit with the first connection hole (12) and in clearance fit with the second connection hole (21).

5. The fuser according to claim 1, characterized in that One of the housing (1) and the covering member (2) is provided with a clamping groove (22), and the other is provided with a clamping projection (13). When the covering member (2) rotates to the second position, the clamping projection (13) is clamped with the clamping groove (22).

6. The fuser according to claim 5, wherein The housing (1) is provided with a boss (14), and the covering member (2) is provided with an avoidance groove (23). When the covering member (2) rotates to the second position, the boss (14) is placed in the avoidance groove (23). The clamping projection (13) is provided on one of the boss (14) and the avoidance groove (23), and the clamping groove (22) is provided on the other.

7. The fusion device according to any one of claims 1-6, characterized in that, The support structure (3) is configured as a mesh structure.

8. The fusion device according to any one of claims 1-6, characterized in that The support structure (3) and the housing (1) are integrally formed.

9. The fusion device according to any one of claims 1-6, characterized in that, Auxiliary communication ports (16) are provided on two opposite side walls of the housing (1) perpendicular to the first communication port (17). The auxiliary communication ports (16) are used to assist in communicating the placement cavity (11) and the external environment.

10. The fuser according to claim 9, characterized in that, The support structure (3) is provided between the respective port walls of the auxiliary communication ports (16).

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