Vertebral body fusion cage

Abstract

The utility model discloses a vertebral body fusion cage which comprises a first supporting main body and a second supporting main body which are of a tubular structure, the second supporting main body is installed in the first supporting main body, the outer diameter of the second supporting main body is smaller than the inner diameter of the first supporting main body, and one end of the second supporting main body penetrates out of the end portion of the first supporting main body. Wherein the second supporting main body and the first supporting main body jointly abut against the vertebral body, and double supporting is conducted on the vertebral body. The second supporting main body is arranged in the protruding mode relative to the first supporting main body, the common ends of the first supporting main body and the second supporting main body abut against the concave face of the vertebral body, and therefore the stability of the vertebral body fusion cage is improved, fusion of the vertebral body and the first supporting main body and fusion of the vertebral body and the second supporting main body are promoted; and meanwhile, the phenomenon of dislocation and deviation of the vertebral fusion cage is avoided.

Description

Technical Field

[0001] This utility model relates to the field of vertebral fusion device technology, and more specifically, to a vertebral fusion device. Background Technology

[0002] Early methods used autologous bone (iliac bone graft) to fill the intervertebral space, but this carried risks of bone resorption, collapse, and displacement. Simple bone grafting cannot provide immediate stability and requires plate / screw fixation, increasing surgical trauma. The goal of vertebral fusion cages is to provide a rigid support structure, maintain intervertebral space height, and create a closed environment for bone growth, promoting intervertebral fusion. Titanium cages, as a type of metal vertebral fusion cage, are used to replace diseased vertebrae and are perforated to facilitate bone fusion, providing stable support to the vertebrae.

[0003] Existing vertebral fusion devices typically use a protruding dowel at the end to abut against the vertebrae, providing support. However, due to the uneven concavity of the vertebrae, some dowels of the fusion device may not make contact with the concave surface, necessitating the grinding of healthy vertebrae or adjustment of the dowel height, leading to complex procedures. To address the technical issue of end-fixation stability in vertebral fusion devices, a radiofrequency plasma ablation electrode with negative pressure adsorption is proposed. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem of fixation stability of vertebral fusion devices in the prior art, and thus proposes a vertebral fusion device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a vertebral fusion device, comprising a first support body and a second support body in the form of a tubular structure, wherein the second support body is installed in the first support body, and the outer diameter of the second support body is smaller than the inner diameter of the first support body, and one end of the second support body protrudes from the end of the first support body; wherein the second support body and the first support body together abut against the vertebral body to provide double support for the vertebral body, thereby improving the stability of the vertebral fusion device.

[0006] Preferably, an inner fixed bushing is installed inside the first support body, wherein a second support body with a stepped structure in the axial direction is slidably connected to the inner wall of the inner fixed bushing, and the lower end of the second support body and the inner wall of the inner fixed bushing are slidably disposed relative to each other, so that the second support body can pass through the end of the first support body; the inner wall of the inner fixed bushing is also provided with symmetrically distributed third protrusions, and a push plate is hinged between the paired third protrusions, so that one end of the push plate pushes the second support body to move axially by rotating it; wherein the third protrusions and the inner fixed bushing are integrally connected.

[0007] Preferably, the inner wall of the inner fixed bushing is further provided with a second protrusion, the second protrusion having a flat surface along the axial direction of the inner fixed bushing, wherein the second protrusion is used to connect to the third protrusion, and the inner fixed bushing is rotatable by providing the second protrusion.

[0008] Preferably, the inner wall of the inner fixed bushing is provided with a second groove, wherein the second groove is used to install the bottom end of the second support body and restrict the movement of the second support body in the inner fixed bushing.

[0009] Preferably, the inner fixed bushing is provided with a fourth through hole, which penetrates one side of the inner fixed bushing. The fourth through hole is used to place the top plate, so that one end of the top plate protrudes from the fourth through hole. The first support body is provided with a third through hole, which penetrates one side of the first support body. The third through hole and the fourth through hole are aligned and opposite each other, so that the top plate can move within the third through hole and the fourth through hole.

[0010] Preferably, a cover is installed at the lower end of the second support body, that is, a cover is installed inside the support base; the cover and the second support body are connected by threads.

[0011] Preferably, the outer surface of the first support body is provided with a second outer fixed bushing, a lower pressure bushing located above the second outer fixed bushing, and a first outer fixed bushing located above the lower pressure bushing. The lower pressure bushing can rotate circumferentially at the lower end of the first outer fixed bushing. The first outer fixed bushing and the first support body are threadedly connected. By rotating the first outer fixed bushing, it moves along the axial direction of the first support body. The first outer fixed bushing drives the lower pressure bushing to press down on the actuating plate, causing the actuating plate to move downward. The other end of the actuating plate moves upward and causes the second support body to pass through the first support body.

[0012] Preferably, the upper end of the pressing bushing is provided with a fifth protrusion, the outer diameter of which is smaller than the outer diameter of the pressing bushing; wherein a fourth groove is provided on the curved surface of the fifth protrusion; the lower end of the first outer fixed bushing is provided with a fourth protrusion, the inner diameter of which is larger than the inner diameter of the first outer fixed bushing; wherein a third groove is provided on the inner wall of the fourth protrusion; wherein the third groove is used to place the upper end of the fifth protrusion, and the fourth groove is used to place the lower end of the fourth protrusion, so that the upper end of the pressing bushing is engaged with the lower end of the first outer fixed bushing, and the pressing bushing and the first outer fixed bushing are rotatably configured.

[0013] Preferably, the actuating plate includes a first bent plate, a second bent plate, and a hinge portion, wherein the hinge portion is located between the first bent plate and the second bent plate, and the first bent plate, the second bent plate, and the hinge portion are an integral structure; wherein the first bent plate is placed in the fourth through hole, the second bent plate is used to actuate the second support body, and the actuating plate is mounted on the third protrusion through the hinge portion; the angle of the actuating plate can be changed by providing the hinge portion.

[0014] Beneficial effects: In this application, a second support body is installed in the first support body, wherein both the first support body and the second support body are tubular structures, and the second support body is protruding relative to the first support body, so that the common ends of the first support body and the second support body abut against the vertebral body. Under the dual support, the stability of the vertebral body fusion device is significantly improved, and the fusion of the vertebral body with the first support body and the second support body is promoted, while avoiding the phenomenon of misalignment and displacement of the vertebral body fusion device. Attached Figure Description

[0015] Figure 1 This is a perspective view of a vertebral fusion device proposed in this utility model;

[0016] Figure 2 This is a bottom view of the vertebral fusion device proposed in this utility model;

[0017] Figure 3 This is a front view of the vertebral fusion device proposed in this utility model;

[0018] Figure 4 for Figure 3 Sectional view at point AA;

[0019] Figure 5 for Figure 3 Sectional view at point AA;

[0020] Figure 6 for Figure 4 Enlarged view of point B.

[0021] Legend:

[0022] 1. First support body; 101. First through hole; 102. Second through hole; 103. Third through hole; 11. Top tooth; 110. First groove; 2. Second support body; 21. Support base; 211. First protrusion; 3. Inner fixed bushing; 30. Second groove; 301. Fourth through hole; 31. Second protrusion; 311. Third protrusion; 4. First outer fixed bushing; 40. Third groove; 41. Fourth protrusion; 5. Downward pressure bushing; 501. Fifth through hole; 502. Fourth groove; 51. Fifth protrusion; 6. Second outer fixed bushing; 7. Top plate; 71. First bending plate; 72. Second bending plate; 73. Hinge; 8. Cover. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and 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 of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] Reference Figures 1-6 According to one embodiment of the present invention, a vertebral fusion device includes a first support body 1 and a second support body 2 in the form of a tubular structure. The second support body 2 is installed in the first support body 1, and the outer diameter of the second support body 2 is smaller than the inner diameter of the first support body 1. One end of the second support body 2 protrudes from the end of the first support body 1. The second support body 2 and the first support body 1 abut against the vertebral body, thus achieving dual support for the vertebral body.

[0026] In this application, the end of the first support body 1 is a circular tubular structure, and the end of the second support body 2 is a circular or elliptical tubular structure; that is, both the first support body 1 and the second support body 2 are provided with a first through hole 101 along the axis, wherein the diameter of the first through hole 101 on the first support body 1 is larger than the diameter of the first through hole 101 on the second support body 2; wherein the second support body 2 is protruding relative to the first support body 1, so that the common ends of the first support body 1 and the second support body 2 abut against the vertebral body, thus achieving dual support for the vertebral body, significantly improving the stability of the vertebral body fusion device, and also promoting the fusion of the vertebral body and the first support body 1 or / and the second support body 2; at the same time, it avoids the phenomenon of misalignment and displacement of the vertebral body fusion device.

[0027] As a further improved embodiment, an inner fixed bushing 3 is installed inside the first support body 1, and a second support body 2 is slidably connected to the inner wall of the inner fixed bushing 3; the second support body 2 has a stepped structure in the axial direction, so that the lower end of the second support body 2 and the inner wall of the inner fixed bushing 3 are slidably disposed relative to each other, so that the second support body 2 can pass through the end of the first support body 1.

[0028] The inner wall of the inner fixed bushing 3 is also provided with symmetrically distributed third protrusions 311. The third protrusions 311 are arranged in pairs, and a push plate 7 is hinged between the pairs of third protrusions 311. By rotating the angle of the push plate 7, one end of it pushes the second support body 2 to move axially, so that the height of the second support body 2 protruding relative to the first support body 1 is adjustable.

[0029] In this embodiment, the second support body 2 is a tubular structure with at least two steps. When the second support body 2 is a tubular structure with two steps, the second support body 2 can slide away from the inner fixed bushing 3, or only slide back and forth in the inner fixed bushing 3. By setting the second support body 2 with adjustable axial position, it can be used for vertebrae with concave surfaces of different depths. Under the combined action of the first support body 1 and the second support body 2, the vertebrae are effectively supported, and the stability of the supported vertebrae is significantly enhanced.

[0030] As a further improved embodiment, the inner wall of the inner fixed bushing 3 is further provided with a second protrusion 31. The second protrusion 31 has a flat surface along the axial direction of the inner fixed bushing 3, and the second protrusion 31 is used to connect with the third protrusion 311. In this embodiment, the inner fixed bushing 3 is rotatable by providing the second protrusion 31. The second protrusion 31 and the third protrusion 311 are integrally connected, and the third protrusion 311 and the inner fixed bushing 3 are integrally connected. In this embodiment, by providing the second protrusion 31 with a flat surface, it can be adapted to the rotation drive component, thus facilitating the adjustment of the axial position of the inner fixed bushing 3.

[0031] As a further improved embodiment, the inner wall of the inner fixed bushing 3 is provided with a second groove 30, wherein the second groove 30 is used to install the bottom end of the second support body 2 and restrict the second support body 2 to move within the inner fixed bushing 3. At the same time, the second support body 2 can achieve circumferential rotation, further increasing the range of motion of the second support body 2, and also making the height position of the protrusion at the end of the second support body 2 adjustable.

[0032] As a further improved embodiment, a support base 21 is provided at the lower end of the second support body 2. The support base 21 and the inner fixed bushing 3 are slidably disposed relative to each other, wherein the inner diameter of the support base 21 is larger than the outer diameter of the second support body 2. When the curved surface of the support base 21 is placed in the second groove 30, the support base 21 can move axially and / or rotate radially within the second groove 30. In a further improvement, a first protrusion 211 is provided at the lower end of the support base 21. In this case, the support base 21 and the inner fixed bushing 3 are slidably disposed relative to each other, and the first protrusion 211 can move axially and / or rotate radially within the second groove 30.

[0033] As a further improved embodiment, the inner fixed bushing 3 is provided with a fourth through hole 301, which penetrates one side of the inner fixed bushing 3. The fourth through hole 301 is used to place the actuating plate 7, so that one end of the actuating plate 7 protrudes from the fourth through hole 301. In this embodiment, the actuating plate 7 rotates in the fourth through hole 301, and the shape of the fourth through hole 301 is not limited. In this application, the inner fixed bushing 3 is rotated in the first support body 1 by means of a threaded connection through the fourth through hole 301, and the angle of the actuating plate 7 is controlled so that it does not restrict the rotation of the inner fixed bushing 3. This embodiment does not limit the fixing method of the inner fixed bushing 3 and the first support body 1. The inner fixed bushing 3 can also be fixed to the first support body 1 by radially mounting fasteners, or the inner fixed bushing 3 can be welded into the first support body 1, or the inner fixed bushing 3 and the first support body 1 can be integrally formed; when the inner fixed bushing 3 and the first support body 1 are detachably connected, the axial position of the inner fixed bushing 3 is adjustable.

[0034] As a further improved embodiment, the fourth through hole 301 extends to the lower end of the inner fixed bushing 3, wherein the fourth through hole 301 has a rectangular structure;

[0035] The first support body 1 is provided with a third through hole 103, which penetrates one side of the first support body 1 and extends downward; that is, the third through hole 103 extends downward along the axial direction of the first support body 1.

[0036] The third through hole 103 and the fourth through hole 301 are positioned coincidentally and directly opposite each other, allowing the actuating plate 7 to move within the third through hole 103 and the fourth through hole 301. In this embodiment, the size of the third through hole 103 is not smaller than that of the fourth through hole 301.

[0037] As a further improved embodiment, a cover 8 is installed at the lower end of the second support body 2, that is, the cover 8 is installed inside the support base 21; the cover 8 and the second support body 2 are threadedly connected; by rotating the cover 8, the depth to which it is inserted into the second support body 2 is controllable, thus further limiting the axial travel range of the jacking plate 7 jacking the second support body 2 and preventing the second support body 2 from excessively compressing the vertebral body. By setting the cover 8, the travel range of the second support body 2 can be further adjusted, making the vertebral fusion device suitable for different concave vertebral bodies.

[0038] As a further improved embodiment, the outer surface of the first support body 1 is provided with a second outer fixed bushing 6, a lowering bushing 5, and a first outer fixed bushing 4. The second outer fixed bushing 6 and the first support body 1 are integrally formed, welded, or threadedly connected. When the second outer fixed bushing 6 and the first support body 1 are threadedly connected, the axial position of the second outer fixed bushing 6 in the first support body 1 can be adjusted by rotating it. The second outer fixed bushing 6 can also limit the rotation angle of the top plate 7 by contacting the top plate 7.

[0039] The lower pressure bushing 5 is located above the second outer fixed bushing 6, and the first outer fixed bushing 4 is located above the lower pressure bushing 5; wherein the lower pressure bushing 5 and the first outer fixed bushing 4 are connected by a snap-fit ​​to form an integral structure, and the lower pressure bushing 5 and the first outer fixed bushing 4 can rotate relative to each other without axial displacement, that is, the lower pressure bushing 5 can rotate circumferentially at the lower end of the first outer fixed bushing 4; the lower pressure bushing 5 is provided with a fifth through hole 501 for placing the top moving plate 7;

[0040] The first outer fixed bushing 4 and the first support body 1 are threaded together. By rotating the first outer fixed bushing 4, it moves along the axial direction of the first support body 1. The first outer fixed bushing 4 drives the lower pressure bushing 5 to press down the top plate 7, causing the top plate 7 to move downward. The other end of the top plate 7 moves upward and causes the second support body 2 to pass through the first support body 1. The lower pressure bushing 5 is used to press down the top plate 7.

[0041] In this application, when the first outer fixing bushing 4 is rotated clockwise, the first outer fixing bushing 4 drives the lower pressing bushing 5 to move toward the second outer fixing bushing 6. The lower pressing bushing 5 cannot rotate radially under the restriction of the top plate 7, and the lower pressing bushing 5 presses down on one end of the top plate 7, causing the other end of the top plate 7 to push the second support body 2 out of the first support body 1. Conversely, when the first outer fixing bushing 4 is rotated clockwise, the first outer fixing bushing 4 drives the lower pressing bushing 5 away from the second outer fixing bushing 6, and under the gravity of the second support body 2, it completely retracts into the first support body 1, making it convenient to remove the first support body 1 and the second support body 2 from the vertebra; at the same time, it drives the top plate 7 to rotate.

[0042] As a further improved embodiment, the upper end of the pressure bushing 5 is provided with a fifth protrusion 51, the outer diameter of the fifth protrusion 51 being smaller than the outer diameter of the pressure bushing 5; wherein a fourth groove 502 is provided on the curved surface of the fifth protrusion 51.

[0043] The lower end of the first outer fixed bushing 4 is provided with a fourth protrusion 41, the inner diameter of the fourth protrusion 41 is larger than the inner diameter of the first outer fixed bushing 4, and a third groove 40 is provided on the inner wall of the fourth protrusion 41.

[0044] The third groove 40 is used to place the upper end of the fifth protrusion 51, and the fourth groove 502 is used to place the lower end of the fourth protrusion 41. Therefore, the upper end of the pressing bushing 5 is engaged with the lower end of the first outer fixed bushing 4, so that the pressing bushing 5 and the first outer fixed bushing 4 can be rotatably set.

[0045] As a further improved embodiment, the actuating plate 7 includes a first bent plate 71, a second bent plate 72, and a hinge portion 73, wherein the hinge portion 73 is located between the first bent plate 71 and the second bent plate 72, wherein the first bent plate 71 is placed in the fourth through hole 301, the second bent plate 72 is used to actuate the second support body 2, and the actuating plate 7 is mounted on the third protrusion 311 through the hinge portion 73. In this embodiment, the first bent plate 71, the second bent plate 72, and the hinge portion 73 are integrally formed.

[0046] As a further improved embodiment, the first support body 1 is provided with a plurality of second through holes 102 on its side wall, so that the first support body 1 can be easily fused with the vertebral body; wherein the second support body 2 is also provided with a second through hole 102 on its side wall, wherein the size of the second through hole 102 of the second support body 2 is not greater than the size of the second through hole 102 on the first support body 1.

[0047] As a further improved embodiment, the ends of both the first support body 1 and the second support body 2 are provided with a plurality of cusps 11, and a first groove 110 is provided between adjacent cusps 11; wherein the size of the cusps 11 of the first support body 1 is larger than the size of the cusps 11 of the second support body 2. In this embodiment, by providing cusps 11, the ends of the first support body 1 and the second support body 2 effectively support the vertebral body, while preventing misalignment or displacement of the first support body 1 and the second support body 2.

[0048] As a further improved embodiment, both ends of the first support body 1 are provided with a second support body 2 whose position is adjustable.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vertebral fusion device, characterized in that: It includes a first support body (1) and a second support body (2) in the form of a tubular structure. The second support body (2) is installed in the first support body (1), and the outer diameter of the second support body (2) is smaller than the inner diameter of the first support body (1). One end of the second support body (2) protrudes from the end of the first support body (1). The second support body (2) and the first support body (1) abut against the vertebral body to provide double support for the vertebral body.

2. The vertebral fusion device according to claim 1, characterized in that: The first support body (1) is equipped with an inner fixed bushing (3), and the inner wall of the inner fixed bushing (3) is slidably connected to a second support body (2) with a stepped structure in the axial direction. The lower end of the second support body (2) and the inner wall of the inner fixed bushing (3) are slidably arranged to each other, so that the second support body (2) can pass through the end of the first support body (1). The inner wall of the inner fixed bushing (3) is also provided with symmetrically distributed third protrusions (311). The third protrusions (311) arranged in pairs are hinged with a push plate (7). By rotating the push plate (7), one end of the push plate (7) pushes the second support body (2) to move axially.

3. The vertebral fusion device according to claim 2, characterized in that: The inner wall of the inner fixed bushing (3) is also provided with a second protrusion (31). The second protrusion (31) has a flat surface along the axial direction of the inner fixed bushing (3). The second protrusion (31) is used to connect with the third protrusion (311). The inner fixed bushing (3) can be rotated by providing the second protrusion (31).

4. The vertebral fusion device according to claim 3, characterized in that: The inner wall of the inner fixed bushing (3) is provided with a second groove (30), wherein the second groove (30) is used to install the bottom end of the second support body (2) and restrict the second support body (2) to move within the inner fixed bushing (3).

5. The vertebral fusion device according to claim 4, characterized in that: The inner fixed bushing (3) is provided with a fourth through hole (301), which penetrates one side of the inner fixed bushing (3) and is used to place the top plate (7) so that one end of the top plate (7) passes through the fourth through hole (301); the first support body (1) is provided with a third through hole (103), which penetrates one side of the first support body (1); the third through hole (103) and the fourth through hole (301) are aligned and opposite each other so that the top plate (7) can move in the third through hole (103) and the fourth through hole (301).

6. The vertebral fusion device according to claim 5, characterized in that: The fourth through hole (301) extends to the lower end of the inner fixed bushing (3), wherein the fourth through hole (301) has a rectangular structure; the third through hole (103) extends downward along the axial direction of its first support body (1); the third through hole (103) is not smaller than the size of the fourth through hole (301).

7. The vertebral fusion device according to claim 5, characterized in that: The lower end of the second support body (2) is equipped with a cover (8), that is, the cover (8) is installed inside the support base (21); the cover (8) and the second support body (2) are connected by threads.

8. The vertebral fusion device according to claim 7, characterized in that: The outer surface of the first support body (1) is provided with a second outer fixed bushing (6), a lower pressure bushing (5) located above the second outer fixed bushing (6), and a first outer fixed bushing (4) located above the lower pressure bushing (5). The lower pressure bushing (5) can rotate circumferentially at the lower end of the first outer fixed bushing (4). The first outer fixed bushing (4) and the first support body (1) are threaded together. By rotating the first outer fixed bushing (4), it moves along the axial direction of the first support body (1). The first outer fixed bushing (4) drives the lower pressure bushing (5) to press down the abutment plate (7), causing the abutment plate (7) to move downward. The other end of the abutment plate (7) moves upward and causes the second support body (2) to pass through the first support body (1).

9. The vertebral fusion device according to claim 8, characterized in that: The upper end of the pressure bushing (5) is provided with a fifth protrusion (51), the outer diameter of the fifth protrusion (51) is smaller than the outer diameter of the pressure bushing (5); the curved surface of the fifth protrusion (51) is provided with a fourth groove (502); the lower end of the first outer fixed bushing (4) is provided with a fourth protrusion (41), the inner diameter of the fourth protrusion (41) is larger than the inner diameter of the first outer fixed bushing (4), the inner wall of the fourth protrusion (41) is provided with a third groove (40); the third groove (40) is used to place the upper end of the fifth protrusion (51), and the fourth groove (502) is used to place the lower end of the fourth protrusion (41), so that the upper end of the pressure bushing (5) is engaged with the lower end of the first outer fixed bushing (4), and the pressure bushing (5) and the first outer fixed bushing (4) are rotatably set.

10. The vertebral fusion device according to claim 8, characterized in that: The actuating plate (7) includes a first bent plate (71), a second bent plate (72), and a hinge (73), wherein the hinge (73) is located between the first bent plate (71) and the second bent plate (72), wherein the first bent plate (71) is placed in the fourth through hole (301), the second bent plate (72) is used to actuate the second support body (2), and the actuating plate (7) is mounted on the third protrusion (311) through the hinge (73).

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