fusion device

Abstract

The utility model relates to a kind of fusioners, the fusioner includes: adjusting assembly and two support plates, two support plates are arranged along up-down direction, and first slide and second slide are equipped on support plate, first slide is arranged adjacent to the front end of support plate, and second slide is arranged adjacent to the rear end of support plate, adjusting assembly includes first push block, second push block and adjusting piece, first push block and second push block are located between two support plates, first push block is matched with first slide, and second push block is matched with second slide, adjusting piece is connected with first push block and second push block, adjusting piece can adjust the distance of first push block and second push block along support plate front-rear direction, to adjust the height and angle of support plate, second push block includes push block body and clamping part, clamping part is equipped at the rear end of push block body, and it is used for cooperating with holding tool, clamping part can be separated from push block body under the action of external force.The utility model's fusioner has adjustable structure, and it is favorable to meet the use demand of different patients.

Description

Technical Field

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

[0002] Interbody fusion is a treatment method for spinal diseases, and an increasing number of people undergo this procedure each year. Because fusion cages are mostly fixed structures, a single cage cannot restore the cervical spine's physiological curvature to the target curvature during surgery. Multiple cages are usually implanted to work together to restore the spinal curvature, which increases the workload and the number of incisions for the patient. Therefore, to make fusion cages suitable for different patients, to minimize the surgical procedure, and to design more adjustable structures are issues that need to be addressed in the current development of fusion cages. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a fusion device with an adjustable structure, which is beneficial to meet the usage needs of different patients.

[0005] The fusion device of this utility model includes: two support plates arranged vertically, each support plate having a first slide rail and a second slide rail. The first slide rail is located near the front end of the support plate and extends inward at an angle from front to back. The second slide rail is located 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 located 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 second push block includes a push block body and a clamping part. The clamping part is located at the rear end of the push block body and is used to cooperate with a holding tool. The clamping part can be separated from the push block body under external force.

[0006] According to an embodiment of the fusion device of this utility model, since 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, when the adjusting member drives the first push block and the second push block to approach each other, under the guiding action of the first and second slide rails and the action of the movable clearance, the angle between the two support plates gradually increases, and the two support plates can move away from each other in the vertical direction, thereby expanding the fusion device to a height and angle suitable for the patient. On the other hand, since the first slide rail and the first push block cooperate with each other, and the second slide rail and the second push block cooperate with each other, the support plates can be prevented from separating from the first and second push blocks in the vertical direction, thereby making the fusion device structure more stable in the initial state.

[0007] Furthermore, since the clamping part is located at the rear end of the pusher body, it allows doctors to easily hold the fusion device with a gripping tool, facilitating adjustments to its position and making it convenient to handle. Because the clamping part can be separated from the pusher body under external force, after the doctor has fixed the fusion device in the designated position, the clamping part can be separated from the pusher body, thereby reducing the space occupied by the fusion device, minimizing the wound area, and promoting postoperative recovery for the patient.

[0008] Therefore, the fusion device of this embodiment has an adjustable structure, which is beneficial to meeting the usage needs of different patients. Furthermore, it has good stability, which helps to improve the fusion effect of the fusion device.

[0009] In some embodiments, the clamping portion includes a sleeve, at least one of the inner wall surface and the outer wall surface of the sleeve being a threaded surface for threaded engagement with the holding tool; and / or, the clamping portion includes a sleeve, the sleeve having a notch on one radial side extending axially along the sleeve; and / or, the clamping portion includes a sleeve, the connection position of the sleeve with the push block body having a weakening groove.

[0010] In some embodiments, the adjusting assembly includes an adjusting bolt, the first push block has a threaded hole, the push block body has a through hole, the adjusting bolt passes through the through hole and engages with the threaded hole, and the adjusting bolt is rotatable to adjust the distance between the first push block and the second push block.

[0011] In some embodiments, the adjusting member includes a retaining ring, the through hole has an annular groove, the retaining ring is installed in the annular groove, and the front end face of the adjusting bolt can abut against the retaining ring.

[0012] In some embodiments, 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-rear direction of the support plate. The first push block cooperates with the first slide.

[0013] In some embodiments, 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-rear direction of the support plate. The second push block cooperates with the second slide.

[0014] In some embodiments, the two support plates are a first support plate and a second support plate, the first support plate is located above the second support plate, the first support plate has a first fixing part, 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, and the first fixing part and the second fixing part are respectively arranged on the left and right sides of the second push block.

[0015] In some embodiments, 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.

[0016] In some embodiments, the support plate has a fixing part located on one side of the second push block in the left-right direction. The fusion device further includes a locking screw and a tensioning screw. The locking screw passes through the fixing part and is used to connect with the vertebrae on the upper and lower sides. The tensioning screw engages with the end of the locking screw.

[0017] In some embodiments, the two support plates are a first support plate and a second support plate, the first support plate being located above the second support plate, the first support plate having a first front stop, and the second support plate having a second front stop, the first front stop extending gradually downward and the second front stop extending gradually upward; and / or, each support plate has a side stop on both sides in the left-right direction, and the side stop extends in the up-down direction; and / or, each of the two support plates has a bone graft window; and / or, both support plates are 3D printed parts. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the fusion device according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the fusion device (after removing the locking screw) and the holding tool in an embodiment of this utility model.

[0020] Figure 3 This is a schematic diagram of the fusion device (without locking screws) according to an embodiment of the present invention.

[0021] Figure 4 This is an exploded view of the fusion device according to an embodiment of this utility model.

[0022] Figure 5 This is a cross-sectional view of the fusion device according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the fusion device after the first support plate has been removed, according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the support plate of the fusion device according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the support plate of the fusion device according to another embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the first pusher block of the fusion device according to an embodiment of the present invention.

[0027] Figure 10 This is a cross-sectional view of the first pusher block of the fusion device according to an embodiment of the present invention.

[0028] Figure 11 This is a schematic diagram of the second pusher block of the fusion device according to an embodiment of the present invention.

[0029] Figure 12 This is a schematic diagram of the adjustment component of the fusion device according to an embodiment of the present invention.

[0030] Figure label:

[0031] 1. Support plate; 11. First slide rail; 111. First sliding surface; 12. Second slide rail; 121. Second sliding surface; 13. First stepped surface; 14. Second stepped surface; 151. First support plate; 152. Second support plate; 16. Fixing part; 161. First fixing part; 162. Second fixing part; 163. Locking hole; 171. First front stop; 172. Second front stop; 173. Side stop; 18. Bone graft window;

[0032] 2. Adjustment assembly; 21. First push block; 211. First push surface; 212. Threaded hole; 22. Second push block; 221. Push block body; 2211. Second push surface; 2212. Through hole; 2213. Annular groove; 222. Clamping part; 2221. Sleeve; 2222. Notch; 2223. Weakening groove; 23. Adjusting component; 231. Adjusting bolt; 24. Snap ring;

[0033] 31. Locking screw; 32. Tensioning screw;

[0034] 4. Holding tools. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below, examples of which are shown 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.

[0036] The following is a reference appendix. Figures 1 to 12 The fusion device of this utility model is described.

[0037] like Figures 1 to 6 As shown, the fusion device of this utility model embodiment includes: an adjustment component 2 and two support plates 1. The two support plates 1 are arranged in the 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.

[0038] 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.

[0039] like Figure 3 and Figure 4 As shown, the second push block 22 includes a push block body 221 and a clamping part 222. The clamping part 222 is located at the rear end of the push block body 221 and is used to cooperate with the holding tool 4. The clamping part 222 can be separated from the push block body 221 under the action of external force.

[0040] According to the embodiment of the fusion device of this utility model, since 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, 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 action 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. Since the first slide rail 11 and the first push block 21 cooperate with each other, and the second slide rail 12 and the second push block 22 cooperate with each other, the support plates 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 device structure more stable in the initial state.

[0041] Furthermore, since the clamping part 222 is located at the rear end of the pusher body 221, it allows the doctor to easily clamp the fusion device using the holding tool 4, facilitating the doctor's adjustment of the fusion device's position and making it convenient to hold. Because the clamping part 222 can be separated from the pusher body 221 under external force, after the doctor has fixed the fusion device in the designated position, the clamping part 222 can be separated from the pusher body 221, thereby reducing the space occupied by the fusion device, reducing the wound area, and promoting postoperative recovery for the patient.

[0042] Therefore, the fusion device of this utility model can be adjusted in height and angle, which is beneficial to meet 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 when the fusion unit is in its initial state (i.e., not expanded), there is a gap 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 not parallel. As the angle between the outer walls of the two support plates 1 of the fusion unit gradually increases, that is, when the two support plates 1 rotate at an angle, the push block and the slide gradually tend to be parallel.

[0044] It is understood that during the gradual opening of the two support plates 1 of the fusion device in the embodiment of this utility model, due to the movable gap between the slide (first slide 11 or second slide 12) and the push block (first push block 21 or second push block 22), the support plate 1 will rotate slightly relative to the first push block 21 and the second push block 22 when the first push block 21 and the second push block 22 push the support plate 1 to move, 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 this time, the angle adjustment of the fusion device is completed.

[0045] When the sliding surface (first sliding surface 11 or second sliding surface 12) is parallel to the mating surface of the push block (first push block 21 or second push block 22), that is, when the angle of the fusion device is adjusted, the adjusting component 23 drives the first push block 21 and the second push block 22 to move closer to each other. At this time, the two support plates 1 will move away from each other while keeping the angle unchanged.

[0046] In other words, the fusion device of this embodiment is first adjusted in angle and then in height. By adopting the above operation method, the fusion device of this embodiment can reduce the handling of the fusion device during the operation, further simplify the operation steps, and reduce the surgical risk.

[0047] Optionally, such as Figure 2 , Figure 10 and Figure 11 As shown, the clamping part 222 includes a sleeve 2221, at least one of the inner wall surface and the outer wall surface of the sleeve 2221 is a threaded surface, which is used to thread with the holding tool 4. It can be understood that the holding tool 4 can be a threaded sleeve. Before the fusion device is implanted into the human body, the doctor can screw the sleeve 2221 onto the sleeve (holding tool 4), which makes it easier for the doctor to apply external force to the fusion device, so that the implantation process of the fusion device is more convenient and smooth, and has stronger operability.

[0048] In one example, the outer wall surface of the sleeve 2221 is a threaded surface, and the outer wall surface of the sleeve 2221 is threadedly engaged with the inner wall surface of the sleeve (holding tool 4).

[0049] Furthermore, such as Figure 11 and Figure 12 As shown, the clamping part 222 includes a sleeve 2221, and the sleeve 2221 has a notch 2222 on one side along its radial direction. The notch 2222 extends along the axial direction of the sleeve 2221. The notch 2222 can weaken the structural strength of the sleeve 2221 so that the doctor can disconnect the sleeve 2221 from the push block body 221.

[0050] In one example, there are two notches 2222 arranged radially opposite to each other along the sleeve 2221, and the notches 2222 are connected to the rear end face of the sleeve 2221.

[0051] Optionally, such as Figure 10 and Figure 11 As shown, the clamping part 222 includes a sleeve 2221, and a weakening groove 2223 is provided at the connection position between the sleeve 2221 and the pusher body 221. It can be understood that the thickness of the weakening groove 2223 is relatively thin. When the doctor bends the sleeve 2221, the sleeve 2221 can break at the weakening groove 2223, thereby making the separation of the sleeve 2221 from the pusher body 221 smoother. The structure is simple and easy to operate.

[0052] In some embodiments, such as Figure 4 and Figure 5 As shown, the adjustment assembly 2 includes an adjustment bolt 231, a threaded hole 212 on the first push block 21, and a through hole 2212 on the push block body 221. The adjustment bolt 231 passes through the through hole 2212 and engages with the threaded hole 212. The adjustment bolt 231 is rotatable 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 adjustment bolt 231 can abut against the second push block 22. When the doctor screws the adjustment bolt 231 into the threaded hole 212, the adjustment bolt 231 can drive the first push block 21 and the second push block 22 closer together, thereby improving the convenience of adjusting the fusion device. Furthermore, the structure is simple and easy to manufacture.

[0053] Optionally, such as Figure 4 , Figure 5 and Figure 11 As shown, the adjusting member 23 includes a retaining ring 24, and an annular groove 2213 is provided in the through hole 2212. The retaining ring 24 is installed in the annular groove 2213, and the front end face of the adjusting bolt 231 can abut against the retaining ring 24. It can be understood that after the fusion device is implanted to the designated position, i.e., after the adjusting member 23 is adjusted, the doctor can insert the retaining ring 24 into the annular groove 2213 using a special tool, and it will engage with the inner wall of the annular groove 2213. Because the front end face of the adjusting bolt 231 can abut against the retaining ring 24, it can prevent the adjusting member 23 from loosening. That is, when the adjusting member 23 moves backward, the retaining ring 24 will stop the adjusting member 23, thus limiting the adjusting member 23 from coming out of the through hole 2212, thereby improving the stability of the fusion device after implantation.

[0054] Optionally, such as Figure 4 and Figure 5 As shown, the front end of the first slide 11 is provided with a first stepped surface 13, which is orthogonal to the vertical direction of the support plate 1. The support plate 1 has an initial state and an extended state. In the initial state, the first push block 21 abuts against the first stepped surface 13. In the extended state, the first push block 21 and the first stepped surface 13 are offset 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 extended), the first push block 21 abuts against the first stepped surface 13 in the vertical direction, which can limit the sliding or slight rotation of the first push block 21 relative to the first slide 11, which is beneficial to improving the stability of the fusion device during use and facilitating the implantation of the fusion device into the patient.

[0055] When the adjusting member 23 drives the first push block 21 and the second push block 22 to move closer to each other, the contact surface of the first push block 21 will gradually shift away from the first step surface 13 in the front-back direction, and the included angle between the outer walls of the two support plates 1 will gradually increase. After the contact surface of the first push block 21 shifts away from the first step surface 13 in the front-back direction, the adjusting member 23 continues to drive the first push block 21 and the second push block 22 to move closer to each other. At this time, the first push block 21 will slide along the first slide rail 11, thereby pushing the two support plates 1 to gradually move away in the vertical direction, so as to increase the support height of the fusion device.

[0056] Specifically, such as Figure 4 and Figure 5 As shown, the first slide rail 11 has a first sliding surface 111, and the first push block 21 has a first push surface 211. In the initial state, the first sliding surface 111 and the first push surface 211 are spaced apart and have an included angle β, with the included angle β opening outwards. In the open state, the first sliding surface 111 and the first push surface 211 are in contact. It can be understood that when the fusion unit is in the initial state, there is a movable gap between the first sliding surface 111 and the first push surface 211, forming an included angle β. As the two support plates 1 are gradually opened, the first sliding surface 111 and the first push surface 211 gradually become parallel and in contact with each other, thereby completing the angle adjustment of the support plate 1.

[0057] It should be noted that there are two first push surfaces 211, arranged on the upper and lower sides of the first push block 21. The first sliding surface 111 of the upper support plate 1 and the first sliding surface 111 of the lower support plate 1 both mate with the corresponding first push surface 211. In the initial state, the first sliding surfaces 111 of the upper and lower support plates 1 form an angle β with the corresponding first push surface 211.

[0058] Taking α as 7° and β as 4° as an example, when the fusion device is in its initial state, the angle between the outer walls of the two support plates 1 is 7°, meaning the initial support angle of the fusion device is 7°. When the fusion device is expanded to its maximum value, the angle change of each support plate 1 is 4°, meaning the total angle change of the two support plates 1 is 8°. In other words, the maximum expansion angle of the fusion device is 15°. The fusion device of this embodiment sets the angle adjustment range to the above parameters, which can meet the usage needs of most patients and has good structural stability.

[0059] For example, the height of the fusion device can vary by 3mm. That is, the height change of the fusion device from its initial state to its maximum height is 3mm. This can meet the usage needs of most patients, and the structure has good stability.

[0060] Optionally, such as Figure 7 and Figure 8As shown, the rear end of the second slide rail 12 is provided with a second step surface 14. The second step surface 14 is orthogonal to the vertical direction of the support plate 1. The support plate 1 has an initial state and an open state. In the initial state, the second push block 22 abuts against the second step surface 14. In the open state, the second push block 22 and the second step surface 14 are offset in the front-back direction of the support plate 1. The second push block 22 cooperates with the second slide rail 12.

[0061] Understandably, when the fusion device is in its initial state (i.e., the fusion device is not expanded), the second push block 22 abuts against the second step surface 14 in the vertical direction. This can limit the sliding or slight rotation of the second push block 22 relative to the second slide 12, which is beneficial to improving the stability of the fusion device during use and making it easier for the fusion device to be implanted into the patient.

[0062] When the adjusting member 23 drives the first push block 21 and the second push block 22 to move closer to each other, the contact surface of the second push block 22 will gradually shift away from the second step surface 14 in the front-back direction, and the included angle between the outer walls of the two support plates 1 will gradually increase. After the contact surface of the second push block 22 shifts away from the second step surface 14 in the front-back direction, the adjusting member 23 continues to drive the first push block 21 and the second push block 22 to move closer to each other. At this time, the second push block 22 will slide along the second slide rail 12, thereby pushing the two support plates 1 to gradually move away in the vertical direction, so as to increase the support height of the fusion device.

[0063] Specifically, such as Figure 7 and Figure 8 As shown, the second slide 12 has a second sliding surface 121, and the second push block 22 has a second push surface 2211. In the initial state, the second sliding surface 121 and the second push surface 2211 are spaced apart and have an included angle β, with the included angle β opening inward. In the open state, the second sliding surface 121 and the second push surface 2211 are in contact. It can be understood that when the fusion unit is in the initial state, there is a movable gap between the second sliding surface 121 and the second push surface 2211, forming an included angle β. As the two support plates 1 are gradually opened, the second sliding surface 121 and the second push surface 2211 gradually tend to be parallel and in contact with each other, thereby completing the angle adjustment of the support plate 1. For example, in the initial state, the included angle β of the fusion unit is 4°.

[0064] In some embodiments, the two support plates 1 are a first support plate 151 and a second support plate 152, respectively. The first support plate 151 is located above the second support plate 152. The first support plate 151 has a first fixing part 161, and the second support plate 152 has a second fixing part 162. Both the first fixing part 161 and the second fixing part 162 are used to insert locking screws 31. The first fixing part 161 and the second fixing part 162 are respectively arranged on the left and right sides of the second push block 22. It can be understood that the locking screw 31 on the first fixing part 161 is inserted obliquely into the upper vertebra in a bottom-up direction, and the locking screw 31 on the second fixing part 162 is inserted obliquely into the lower vertebra in a top-down direction, thereby improving the stability of the fusion device implantation.

[0065] Optionally, such as Figures 1 to 4 As shown, the second slide rail 12 on the first support plate 151 is disposed on the first fixing part 161 and arranged adjacent to the upper side of the first fixing part 161. The second slide rail 12 on the second support plate 152 is disposed on the second fixing part 162 and arranged adjacent to the lower side of the second fixing part 162. This can improve the structural strength of the first support plate 151 and the second support plate 152 and reduce the risk of the first fixing part 161 and the second fixing part 162 splitting when the locking screw 31 is tightened.

[0066] Optionally, such as Figures 1 to 4 As shown, the support plate 1 has a fixing part 16 (i.e., a first fixing part 161 and a second fixing part 162). The fixing part 16 is located on one side of the second push block 22 along the left-right direction. The fusion device also includes a locking screw 31 and a tensioning screw 32. The locking screw 31 passes through the fixing part 16 and is used to connect with the vertebrae on the upper and lower sides. The tensioning screw 32 is fitted at the end of the locking screw 31. It can be understood that the fixing part 16 is provided with a locking hole 163, and the locking screw 31 passes through the hole. After the locking screw 31 is implanted, the tensioning screw 32 can be screwed on the end of the locking screw 31, thereby reducing the probability of the locking screw 31 loosening from the fixing part 16 and improving the stability of the locking screw 31 after implantation.

[0067] In some embodiments, such as Figure 5As shown, the two support plates 1 are a first support plate 151 and a second support plate 152, respectively. The first support plate 151 is located above the second support plate 152. 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, the first front stop 171 and the second front stop 172 are abutted together. As the fusion device gradually expands, the first front stop 171 and the second front stop 172 can gradually separate in the vertical direction. The fusion device of this embodiment, by providing the first front stop 171 and the second front stop 172, can avoid the problem of bone cement injected into the two support plates 1 leaking at the front end of the fusion device, thus reducing surgical risks.

[0068] Optionally, such as Figure 6 and Figure 9 As shown, the support plate 1 has side baffles 173 on both sides along its left and right directions, and the side baffles 173 extend in the vertical direction. The two side baffles 173 can prevent the bone cement filled into the two support plates 1 from leaking on the left and right sides of the fusion device, reducing the surgical risk.

[0069] Optionally, such as Figure 1 As shown, both support plates 1 are provided with bone graft windows 18. For example, the bone graft windows 18 are located on the upper wall of the first support plate 151 and the lower wall of the second support plate 152. This can improve the fusion effect between the fusion device and the adjacent vertebrae above and below, and improve the stability of the fusion device after implantation.

[0070] Optionally, both support plates 1 are 3D printed parts. This allows the support plates 1 to be configured with a porous structure, improving the fusion effect of adjacent vertebrae and controlling the elastic modulus of the fusion device.

[0071] In the description of this utility model, 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", 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 are not intended to 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.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0074] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

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 and second push blocks are disposed between the two support plates. The first push block is slidably connected to a first slide rail with a clearance fit, and the second push block is slidably connected to a second slide rail with a clearance fit. The adjustment member is connected to the first and second push blocks and can adjust the distance between the first and second push blocks along the front-rear direction of the support plates to adjust the height and angle of the support plates. The second push block includes a push block body and a clamping part. The clamping part is located at the rear end of the push block body and is used to cooperate with a holding tool. The clamping part can be separated from the push block body under the action of external force.

2. The fusion device according to claim 1, characterized in that, The clamping part includes a sleeve, at least one of the inner wall surface and the outer wall surface of the sleeve is a threaded surface, and the threaded surface is used to engage with the holding tool threadedly. And / or, the clamping part includes a sleeve having a notch on one radial side thereof, the notch extending axially along the sleeve; And / or, the clamping part includes a sleeve, and a weakening groove is provided at the connection position between the sleeve and the push block body.

3. 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 push block body 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.

4. The fusion device according to claim 3, characterized in that, The adjusting assembly includes a retaining ring, and the through hole has an annular groove. The retaining ring is installed in the annular groove, and the front end face of the adjusting bolt can abut against the retaining ring.

5. The fusion device according to claim 1, characterized in that, 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-rear direction of the support plate. The first push block cooperates with the first slide.

6. 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.

7. 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.

8. The fusion device according to claim 7, 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.

9. 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.

10. The fusion device according to any one of claims 1-9, 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 support plate is provided with side stops on both sides along the left and right directions, and the side stops extend along the up and down directions; 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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