fusion device

Abstract

The application relates to a fusion device, which comprises an adjusting assembly and two support plates arranged in the up-down direction, wherein a first sliding channel and a second sliding channel are arranged on the support plates, the first sliding channel is arranged adjacent to the front end of the support plate and extends in the direction from front to back and is inclined to extend inward, and the second sliding channel is arranged adjacent to the rear end of the support plate and extends in the direction from front to back and is inclined to extend outward; the adjusting assembly comprises a first push block, a second push block and an adjusting piece, the first push block and the second push block are arranged between the two support plates, the first push block is in sliding connection with the first sliding channel and is in clearance fit, the second push block is in sliding connection with the second sliding channel and is in clearance fit, the adjusting piece is connected with the first push block and the second push block, and the adjusting piece can adjust the distance between the first push block and the second push block in the front-rear direction of the support plate, so as to adjust the height and angle of the support plate. The fusion device can adjust the height and angle, and is beneficial to meet the use requirements of different patients.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a fusion cage. BACKGROUND

[0002] Intervertebral fusion is one of the methods for treating spinal diseases, and more and more people receive intervertebral fusion treatment every year. Since the fusion cage is mostly of a fixed structure, a single fusion cage cannot restore the physiological curvature of the cervical spine of the patient to the target physiological curvature during surgery, and usually multiple fusion cages need to be implanted to restore the physiological curvature of the patient's spine, which increases the workload of the surgery and the number of patient incisions. Therefore, in order to make the fusion cage meet the use requirements of different patients and make the surgery process minimally invasive, it is necessary to set a better adjustable structure, which is a problem to be solved in the development of the current fusion cage. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the present application proposes a fusion cage having an adjustable structure, which is beneficial to meet the use requirements of different patients.

[0005] The fusion cage of the embodiment of the present application comprises two support plates arranged in the up-down direction, a first sliding channel and a second sliding channel are arranged on the support plates, the first sliding channel is arranged adjacent to the front end of the support plate and extends inwardly along the direction from front to back, and the second sliding channel is arranged adjacent to the rear end of the support plate and extends outwardly along the direction from front to back; an adjusting assembly comprising a first push block, a second push block and an adjusting piece, the first push block and the second push block are arranged between the two support plates, the first push block is in sliding connection with the first sliding channel and in clearance fit, the second push block is in sliding connection with the second sliding channel and in clearance fit, the adjusting piece is connected with the first push block and the second push block, and the adjusting piece can adjust the distance between the first push block and the second push block in the front-rear direction of the support plate to adjust the height and angle of the support plate.

[0006] According to the fusion cage of the embodiment of the present application, since the first push block is in sliding connection with the first slide rail and in clearance fit, the second push block is in sliding connection with the second slide rail and in clearance fit, when the adjusting member drives the first push block and the second push block to approach each other, under the guidance of the first slide rail and the second slide rail and the action of the clearance, the angle between the two support plates gradually increases, and the two support plates can move away from each other in the up-down direction, so that the fusion cage can be expanded to a height and an angle suitable for the patient. On the other hand, since the first slide rail and the first push block are matched with each other, and the second slide rail and the second push block are matched with each other, the support plates can be prevented from separating from the first push block and the second push block in the up-down direction, so that the structure of the fusion cage in the initial state is more stable. Therefore, the fusion cage of the embodiment of the present application can adjust the height and the angle, and is beneficial to meet the use requirements of different patients.

[0007] In some embodiments, the front end of the first slide rail is provided with a first step surface, the first step surface is orthogonal to the up-down direction of the support plate, the support plate has an initial state and an expanded state, in the initial state, the first push block abuts against the first step surface, in the expanded state, the first push block is staggered with the first step surface in the front-rear direction of the support plate, and the first push block is matched with the first slide rail.

[0008] In some embodiments, the first slide rail has a first slide surface, the first push block has a first push surface, in the initial state, the first slide surface and the first push surface are spaced apart and have an included angle β, and the included angle β is outwardly open, in the expanded state, the first slide surface and the first push surface are in close contact.

[0009] In some embodiments, in the initial state, the included angle between the outer wall surfaces of the two support plates is α, wherein 6°≤α≤8°, and 3°≤β≤5°.

[0010] In some embodiments, the rear end of the second slide rail is provided with a second step surface, the second step surface is orthogonal to the up-down direction of the support plate, the support plate has an initial state and an expanded state, in the initial state, the second push block abuts against the second step surface, in the expanded state, the second push block is staggered with the second step surface in the front-rear direction of the support plate, and the second push block is matched with the second slide rail.

[0011] In some embodiments, the two support plates are a first support plate and a second support plate, the first support plate is located on the upper side of the second support plate, the first support plate has a first fixing portion, the second support plate has a second fixing portion, the first fixing portion and the second fixing portion are both used for penetrating a locking screw, and the first fixing portion and the second fixing portion are arranged on the left and right sides of the second push block, respectively.

[0012] In some embodiments, the second slide on the first support plate is arranged on the first fixed part and adjacent to the upper side of the first fixed part, and the second slide on the second support plate is arranged on the second fixed part and adjacent to the lower side of the second fixed part.

[0013] In some embodiments, the support plate has a fixed part arranged on one side of the second push block in the left-right direction, and the fusion cage further comprises a locking screw and a tensioning screw, the locking screw is arranged in the fixed part and used for connecting with the upper and lower vertebrae, and the tensioning screw is matched with the end of the locking screw.

[0014] In some embodiments, the adjusting member comprises an adjusting bolt, the first push block is provided with a threaded hole, the second push block is provided with a through hole, the adjusting bolt is arranged in the through hole and matched with the threaded hole, and the adjusting bolt is rotatable to adjust the distance between the first push block and the second push block.

[0015] In some embodiments, the adjusting member further comprises a snap ring, the snap ring is installed on the adjusting bolt, and the snap ring is located between the first push block and the second push block, and when the adjusting bolt is screwed to the limit position, the snap ring can abut against the first push block or the second push block.

[0016] In some embodiments, the two support plates are respectively a first support plate and a second support plate, the first support plate is located on the upper side of the second support plate, the first support plate has a first front stop part, the second support plate has a second front stop part, the first front stop part gradually extends downward, and the second front stop part gradually extends upward; and / or, the first push block is provided with a side stop part on both sides thereof in the left-right direction, and the side stop part is located between the two support plates; and / or, the two support plates are both provided with a bone graft window; and / or, the two support plates are both 3D printed parts. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the fusion cage of the embodiment of the present application.

[0018] Figure 2 is a schematic view of the fusion cage (after removing the locking screw) of the embodiment of the present application.

[0019] Figure 3 is a sectional view of the fusion cage of the embodiment of the present application in the initial state.

[0020] Figure 4 is another sectional view of the fusion cage of the embodiment of the present application in the initial state.

[0021] Figure 5is a sectional view of the fusion cage of the embodiment of the present application after the angle adjustment of the expansion is completed.

[0022] Figure 6 is a sectional view of another position of the fusion cage of the embodiment of the present application after the angle adjustment of the expansion is completed.

[0023] Figure 7 is a schematic view of the support plate of the fusion cage of the embodiment of the present application.

[0024] Figure 8 is a schematic view of another perspective of the support plate of the fusion cage of the embodiment of the present application.

[0025] Figure 9 is a schematic view of another perspective of the support plate of the fusion cage of the embodiment of the present application.

[0026] Figure 10 is a schematic view of the first push block of the fusion cage of the embodiment of the present application.

[0027] Figure 11 is a schematic view of another perspective of the first push block of the fusion cage of the embodiment of the present application.

[0028] Figure 12 is a schematic view of the second push block of the fusion cage of the embodiment of the present application.

[0029] Figure 13 is a schematic view of the adjusting member of the fusion cage of the embodiment of the present application.

[0030] Figure 14 is a schematic view of the clasp ring of the fusion cage of the embodiment of the present application.

[0031] Figure 15 is a schematic view of the installation of the locking screw and the tensioning screw of the fusion cage of the embodiment of the present application.

[0032] Reference signs:

[0033] 1, support plate; 11, first slide; 111, first slide surface; 12, second slide; 121, second slide surface; 13, first step surface; 14, second step surface; 151, first support plate; 152, second support plate; 16, fixed part; 161, first fixed part; 162, second fixed part; 163, locking hole; 171, first front stop; 172, second front stop; 18, bone window;

[0034] 2, adjusting assembly; 21, first push block; 211, first push surface; 212, threaded hole; 213, side stop; 22, second push block; 221, second push surface; 222, holding groove; 223, through hole; 23, adjusting member; 231, adjusting bolt; 24, clasp ring;

[0035] 31. Locking screw; 32. Tensioning screw. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] The following is a reference appendix. Figures 1 to 15 The fusion processor of an embodiment of the present invention is described.

[0038] like Figures 1 to 6 As shown, the fusion device of this embodiment includes: an adjustment component 2 and two support plates 1. The two support plates 1 are arranged in a vertical direction. The support plates 1 are provided with a first slide rail 11 and a second slide rail 12. The first slide rail 11 is arranged near the front end of the support plate 1 and extends inward at an angle from front to back. The second slide rail 12 is arranged near the rear end of the support plate 1 and extends outward at an angle from front to back.

[0039] The adjustment component 2 includes a first push block 21, a second push block 22, and an adjustment member 23. The first push block 21 and the second push block 22 are both located between the two support plates 1. The first push block 21 is slidably connected to the first slide rail 11 with a clearance fit, and the second push block 22 is slidably connected to the second slide rail 12 with a clearance fit. The adjustment member 23 is connected to the first push block 21 and the second push block 22. The adjustment member 23 can adjust the distance between the first push block 21 and the second push block 22 along the front-back direction of the support plate 1 to adjust the height and angle of the support plate 1.

[0040] According to an embodiment of the present invention, the fusion device is slidably connected to the first slide rail 11 with a clearance fit, and the second push block 22 is slidably connected to the second slide rail 12 with a clearance fit. When the adjusting member 23 drives the first push block 21 and the second push block 22 to move closer to each other, under the guiding effect of the first slide rail 11 and the second slide rail 12 and the action of the movable gap, the angle between the two support plates 1 gradually increases, and the two support plates 1 can move away from each other in the vertical direction, thereby opening the fusion device to a height and angle suitable for the patient.

[0041] On the other hand, since the first slide 11 and the first push block 21 cooperate with each other, and the second slide 12 and the second push block 22 cooperate with each other, the support plate 1 can be prevented from separating from the first push block 21 and the second push block 22 in the vertical direction, thereby making the fusion structure in the initial state more stable.

[0042] Therefore, the fusion device of the present invention can adjust its height and angle, which is beneficial to meeting the needs of different patients. It has a wide range of applications, good stability, and is conducive to improving the fusion effect of the fusion device.

[0043] It should be noted that, as shown in Figure 3 and Figure 4 When the fusion device is in the initial state (i.e. not expanded), there is a clearance between the slide (first slide 11 or second slide 12) and the push block (first push block 21 or second push block 22), and the push block and the slide are in a non-parallel state. As shown in Figure 5 and Figure 6 When the angle between the outer wall surfaces of the two support plates 1 of the fusion device gradually increases, i.e. the two support plates 1 are angularly rotated, the push block and the slide gradually tend to be parallel.

[0044] It can be understood that, during the gradual expansion of the two support plates 1 of the fusion device of the embodiment of the present application, since there is a clearance between the slide (first slide 11 or second slide 12) and the push block (first push block 21 or second push block 22), when the first push block 21 and the second push block 22 push the support plates 1 to move, the support plates 1 will slightly rotate relative to the first push block 21 and the second push block 22, until the mating surfaces of the first slide 11 and the first push block 21 are parallel to each other, and the mating surfaces of the second slide 12 and the second push block 22 are parallel to each other, at which time the angle adjustment of the fusion device is completed.

[0045] When the mating surfaces of the slide (first slide 11 or second slide 12) and the push block (first push block 21 or second push block 22) are parallel, i.e. when the angle adjustment of the fusion device is completed, the adjusting member 23 drives the first push block 21 and the second push block 22 to move closer to each other, at which time the two support plates 1 will move away from each other while maintaining the angle unchanged.

[0046] In other words, the fusion device of the embodiment of the present application first performs angle adjustment and then height adjustment. The fusion device of the embodiment of the present application adopts the above operation mode, which can reduce the handling of the fusion device during surgery, further simplify the surgical steps, and reduce the risk of surgery.

[0047] Optionally, as shown in Figure 3 and Figure 5 The front end of the first slide 11 is provided with a first step surface 13, which is orthogonal to the up-down direction of the support plate 1. The support plate 1 has an initial state and an expanded state. In the initial state, the first push block 21 abuts against the first step surface 13, and in the expanded state, the first push block 21 is offset from the first step surface 13 in the front-rear direction of the support plate 1, and the first push block 21 cooperates with the first slide 11. It can be understood that, when the fusion device is in the initial state (i.e. the fusion device is not expanded), the first push block 21 abuts against the first step surface 13 in the up-down direction, thereby limiting the sliding or slight rotation of the first push block 21 relative to the first slide 11, which is conducive to improving the stability of the fusion device during use, and facilitating the implantation of the fusion device into the patient's body.

[0048] When the adjusting member 23 drives the first push block 21 and the second push block 22 to move close to each other, the abutting surface of the first push block 21 will gradually be staggered with the first step surface 13 in the front-rear direction, and the included angle between the outer wall surfaces of the two support plates 1 will gradually increase. After the abutting surface of the first push block 21 is staggered with the first step surface 13 in the front-rear direction, the adjusting member 23 continues to drive the first push block 21 and the second push block 22 to move close to each other, at this time, the first push block 21 will slide along the first slide 11, thereby pushing the two support plates 1 to gradually move away in the up-down direction, so as to increase the support height of the fusion cage.

[0049] Specifically, as shown in Figure 4 and Figure 6 , the first slide 11 has a first slide surface 111, and the first push block 21 has a first push surface 211, in the initial state, the first slide surface 111 and the first push surface 211 are spaced apart and have an included angle β, and the included angle β is outwardly open, and in the distraction state, the first slide surface 111 and the first push surface 211 are in close contact. It can be understood that when the fusion cage is in the initial state, there is a movement gap between the first slide surface 111 and the first push surface 211, and an included angle β is formed. When the two support plates 1 are gradually distracted, the first slide surface 111 and the first push surface 211 gradually tend to be parallel and in close contact with each other, thereby completing the angle adjustment of the support plate 1.

[0050] It should be noted that the first push surface 211 is two and arranged on the upper and lower sides of the first push block 21, and the first slide surface 111 of the upper support plate 1 and the first slide surface 111 of the lower support plate 1 are matched with the corresponding first push surface 211. In the initial state, the first slide surface 111 of the upper and lower support plates 1 forms an included angle β with the corresponding first push surface 211.

[0051] Optionally, in the initial state, the included angle between the outer wall surfaces of the two support plates 1 is α, wherein 6°≤α≤8°, 3°≤β≤5°. For example, α can be 6°, 7°, 8°, and β can be 3°, 4°, 5°.

[0052] For example, when α is 7° and β is 4°. When the fusion cage is in the initial state, the included angle between the outer wall surfaces of the two support plates 1 is 7°, that is, the initial support angle of the fusion cage is 7°. When the fusion cage is distracted to the maximum, the angle of each support plate 1 changes by 4°, that is, the total angle change of the two support plates 1 is 8°. In other words, the maximum distraction angle of the fusion is 15°. The fusion cage of the embodiment of the present application sets the angle adjustment range to the above parameters, which can meet the use requirements of most patients, and has good structural stability.

[0053] For example, the height change of the fusion cage can be 3mm. That is, the height change of the fusion cage from the initial state to the maximum height is 3mm. Thus, the use requirements of most patients can be met, and the structural stability is good.

[0054] Optionally, as shown in Figure 9 and Figure 12 , the rear end of the second slide 12 is provided with a second step surface 14, the second step surface 14 is perpendicular to the up-down direction of the support plate 1, the support plate 1 has an initial state and a distraction state, in the initial state, the second push block 22 abuts against the second step surface 14, in the distraction state, the second push block 22 is staggered with the second step surface 14 in the front-rear direction of the support plate 1, and the second push block 22 cooperates with the second slide 12.

[0055] It can be understood that, in the initial state (i.e. the fusion cage is not distracted), the second push block 22 abuts against the second step surface 14 in the up-down direction, thereby the second push block 22 can be limited from sliding or slightly rotating relative to the second slide 12, which is beneficial to improve the stability of the fusion cage in use, and facilitates the implantation of the fusion cage into the patient's body.

[0056] As shown in Figure 9 and Figure 12 , when the adjusting member 23 drives the first push block 21 and the second push block 22 to approach each other, the abutting surface of the second push block 22 will gradually be staggered with the second step surface 14 in the front-rear direction, and the included angle between the outer wall surfaces of the two support plates 1 will gradually increase. After the abutting surface of the second push block 22 is staggered with the second step surface 14 in the front-rear direction, the adjusting member 23 continues to drive the first push block 21 and the second push block 22 to approach each other, at this time, the second push block 22 will slide along the second slide 12, thereby pushing the two support plates 1 to gradually move away in the up-down direction, so as to increase the support height of the fusion cage.

[0057] Specifically, as shown in Figure 9 and Figure 12 , the second slide 12 has a second slide surface 121, and the second push block 22 has a second push surface 221, in the initial state, the second slide surface and the second push surface 221 are spaced apart and have an included angle β, and the included angle β opens inward, and in the distraction state, the second slide surface and the second push surface 221 are in close contact. It can be understood that, when the fusion cage is in the initial state, there is a clearance between the second slide surface and the second push surface 221, and an included angle β is formed. When the two support plates 1 are gradually distracted, the second slide surface and the second push surface 221 gradually tend to be parallel and in close contact with each other, thereby completing the angle adjustment of the support plates 1. For example, the included angle β of the fusion cage in the initial state is 4°.

[0058] In some embodiments, as shown in Figures 3 to 6As shown in

[0059] Optionally, as shown in Figure 1 and Figure 2 , the second sliding groove 12 on the first support plate 151 is arranged on the first fixing portion 161 and adjacent to the upper side of the first fixing portion 161, and the second sliding groove 12 on the second support plate 152 is arranged on the second fixing portion 162 and adjacent to the lower side of the second fixing portion 162. In this way, the structural strength of the first support plate 151 and the second support plate 152 can be improved, and the risk of splitting of the first fixing portion 161 and the second fixing portion 162 when the locking screw 31 is tightened can be reduced.

[0060] Optionally, as shown in Figure 1 and Figure 15 , the support plate 1 has a fixing portion 16 (i.e. the first fixing portion 161 and the second fixing portion 162), the fixing portion 16 is arranged on one side of the second push block 22 in the left-right direction, and the fusion cage further comprises a locking screw 31 and a tightening screw 32, the locking screw 31 is arranged in the fixing portion 16 and is used to connect with the upper and lower vertebrae, and the tightening screw 32 is matched at the end of the locking screw 31. It can be understood that the fixing portion 16 is provided with a locking hole 163, the locking screw 31 is arranged in the hole, and after the locking screw 31 is implanted, the tightening screw 32 can be screwed at the end of the locking screw 31, thereby reducing the probability of loosening of the locking screw 31 from the fixing portion 16 and improving the stability of the locking screw 31 after implantation.

[0061] Optionally, as shown in Figure 1 , Figure 2 and Figure 12 , the upper and lower end faces of the second push block 22 are provided with holding grooves 222, so that the doctor can hold the fusion cage by the holding clamp, thereby improving the convenience of implanting the fusion cage.

[0062] In some embodiments, as shown in Figure 4 , Figure 12 and Figure 13As shown in the figure, the adjusting member 23 comprises an adjusting screw 231, the first push block 21 is provided with a threaded hole 212, the second push block 22 is provided with a through hole 223, the adjusting screw 231 passes through the through hole 223 and cooperates with the threaded hole 212, and the adjusting screw 231 can be rotated to adjust the distance between the first push block 21 and the second push block 22. It can be understood that the end of the adjusting screw 231 can abut against the second push block 22, and when the doctor rotates the adjusting screw 231 into the threaded hole 212, the adjusting screw 231 can drive the first push block 21 and the second push block 22 to approach each other, thereby improving the convenience of adjusting the fusion cage, and the structure design is simple and convenient to manufacture.

[0063] Optionally, as shown in Figure 4 , Figure 12 and Figure 13 , the adjusting member 23 further comprises a snap ring 24, the snap ring 24 is installed on the adjusting screw 231, and the snap ring 24 is located between the first push block 21 and the second push block 22. When the adjusting screw 231 is rotated to the limit position, the snap ring 24 can abut against the first push block 21 or the second push block 22. It can be understood that when the adjusting screw 231 is rotated forward into the threaded hole 212 to the limit position, the snap ring 24 can abut against the first push block 21 to limit the continuous rotation of the adjusting screw 231. When the adjusting screw 231 is rotated out of the threaded hole 212 to the limit position, the snap ring 24 can abut against the second push block 22, thereby avoiding the adjusting screw 231 from being separated from the first push block 21 and the second push block 22, thereby improving the convenience of adjusting the adjusting member 23.

[0064] In some embodiments, as shown in Figures 3 to 6 , the first support plate 151 has a first front stop 171, and the second support plate 152 has a second front stop 172, the first front stop 171 gradually extends downward, and the second front stop 172 gradually extends upward. It can be understood that in the initial state of the fusion cage, the first front stop 171 and the second front stop 172 are embedded together in the up-down direction, and when the fusion cage is gradually expanded, the first front stop 171 and the second front stop 172 can gradually separate in the up-down direction. The fusion cage of the embodiment of the present application can avoid the problem of leakage of bone cement filled into the two support plates 1 at the front end of the fusion cage by providing the first front stop 171 and the second front stop 172, thereby reducing the risk of surgery.

[0065] Optionally, as shown in Figure 11 and Figure 12 , the first push block 21 is provided with a side stop 213 on both sides thereof in the left-right direction, and the side stop 213 is located between the two support plates 1. It can be understood that the first push block 21 is provided with a side stop 213 on both sides thereof, and the two side stops 213 can avoid the problem of leakage of bone cement filled into the two support plates 1 at the left and right sides of the fusion cage, thereby reducing the risk of surgery.

[0066] Optionally, as shown in Figure 1 and Figure 2 The two support plates 1 are each provided with a bone graft window 18, for example, the bone graft window 18 is arranged on the upper wall surface of the first support plate 151 and the lower wall surface of the second support plate 152. In this way, the fusion effect of the fusion cage and the adjacent upper and lower vertebrae can be improved, and the stability of the fusion cage after implantation can be improved.

[0067] Optionally, the two support plates 1 are 3D printed parts. In this way, the support plate 1 can be provided with a porous structure, the fusion effect of the adjacent vertebrae can be improved, and the elastic modulus of the fusion cage can be controlled.

[0068] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0069] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0070] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the specification are not necessarily directed to the same embodiment or example. Also, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0073] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary, and are not to be construed as limiting the present application, and changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A fusion device, characterized in that, include: Two support plates are arranged vertically. Each support plate is provided with a first slide rail and a second slide rail. The first slide rail is arranged near the front end of the support plate and extends inward at an angle from front to back. The second slide rail is arranged near the rear end of the support plate and extends outward at an angle from front to back. An adjustment assembly includes a first push block, a second push block, and an adjustment member. The first push block and the second push block are disposed between the two support plates. The first push block is slidably connected to the first slide rail with a clearance fit, and the second push block is slidably connected to the second slide rail with a clearance fit. The adjustment member is connected to the first push block and the second push block and can adjust the distance between the first push block and the second push block along the front-back direction of the support plate to adjust the height and angle of the support plate. The front end of the first slide is provided with a first stepped surface, which is orthogonal to the vertical direction of the support plate. The support plate has an initial state and an open state. In the initial state, the first push block abuts against the first stepped surface. In the open state, the first push block and the first stepped surface are offset in the front-back direction of the support plate. The first push block cooperates with the first slide. The first slide has a first sliding surface, and the first push block has a first pushing surface. In the initial state, the first sliding surface and the first push surface are spaced apart and have an included angle β, and the included angle β opens outward. In the open state, the first sliding surface and the first push surface are in contact. When the first sliding surface and the first push surface are in contact, the adjusting member drives the first push block and the second push block to move closer to each other again. At this time, the two support plates will move away from each other while maintaining the same angle.

2. The fusion device according to claim 1, characterized in that, In the initial state, the included angle between the outer walls of the two support plates is α, where 6°≤α≤8° and 3°≤β≤5°.

3. The fusion device according to claim 1, characterized in that, The rear end of the second slide is provided with a second stepped surface, which is orthogonal to the vertical direction of the support plate. The support plate has an initial state and an open state. In the initial state, the second push block abuts against the second stepped surface. In the open state, the second push block and the second stepped surface are offset in the front-back direction of the support plate. The second push block cooperates with the second slide.

4. The fusion device according to claim 1, characterized in that, The two support plates are a first support plate and a second support plate. The first support plate is located on the upper side of the second support plate. The first support plate has a first fixing part, and the second support plate has a second fixing part. Both the first fixing part and the second fixing part are used to pass through locking screws. The first fixing part and the second fixing part are respectively arranged on the left and right sides of the second push block.

5. The fusion device according to claim 4, characterized in that, The second slide rail on the first support plate is disposed on the first fixing part and arranged adjacent to the upper side of the first fixing part, and the second slide rail on the second support plate is disposed on the second fixing part and arranged adjacent to the lower side of the second fixing part.

6. The fusion device according to claim 1, characterized in that, The support plate has a fixing part, which is located on one side of the second push block in the left-right direction. The fusion device also includes a locking screw and a tensioning screw. The locking screw passes through the fixing part and is used to connect with the upper and lower vertebrae. The tensioning screw is engaged with the end of the locking screw.

7. The fusion device according to claim 1, characterized in that, The adjusting component includes an adjusting bolt. The first push block has a threaded hole, and the second push block has a through hole. The adjusting bolt passes through the through hole and engages with the threaded hole. The adjusting bolt is rotatable to adjust the distance between the first push block and the second push block.

8. The fusion device according to claim 7, characterized in that, The adjusting component also includes a retaining ring, which is mounted on the adjusting bolt and located between the first push block and the second push block. When the adjusting bolt is turned to its limit position, the retaining ring can abut against the first push block or the second push block.

9. The fusion device according to any one of claims 1-8, characterized in that, The two support plates are a first support plate and a second support plate, with the first support plate located above the second support plate. The first support plate has a first front stop, and the second support plate has a second front stop. The first front stop gradually extends downward, and the second front stop gradually extends upward. And / or, the first push block is provided with side stops on both sides along its left and right directions, and the side stops are located between the two support plates; And / or, both of the support plates are provided with bone graft windows; And / or, both of the support plates are 3D printed parts.

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