Fuser

Abstract

The present invention discloses a fusion device, belonging to the technical field of orthopedic implants. The fusion device includes a fusion device main body. A screw placement window is provided on the rear side wall of the fusion device main body. A spreading screw is arranged in the screw placement window. The spreading screw includes a vertical screw body and a transverse stop rod perpendicular to the screw body and slidably engaged with the two inner side walls of the screw placement window. A through hole communicating with the screw placement window for the screw body to pass through is provided on the surface of the fusion device main body; the screw placement window has an initial installation position and a spreading position. At the initial installation position, the end of the screw body of the spreading screw is located in the through hole and does not penetrate the surface of the fusion device main body; at the spreading position, the transverse stop rod of the spreading screw is in interference fit with the two inner side walls of the screw placement window, and the end of the screw body of the spreading screw penetrates the surface of the fusion device main body through the through hole. The fusion device of the present invention can prevent the fusion device from slipping out between the vertebrae.

Description

Technical Field

[0001] The present invention relates to the technical field of orthopedic implants, and particularly to a fusion device. Background Art

[0002] For the common spinal disease of cervical disc herniation, the current effective treatment method is to perform cervical spine surgery. In order to restore the intervertebral height and physiological curvature of the cervical spine and achieve immediate stability of the cervical spine, bone graft fusion needs to be carried out in the decompression area. Among them, anterior cervical decompression and bone graft fusion is a commonly used surgical method for treating cervical spondylosis in clinical practice.

[0003] Due to the 5-10 degree inclination of the surface of the cervical vertebrae, the inconsistent anterior and posterior heights between the vertebrae (higher in the front and lower in the back), and the irregularity of the upper and lower surfaces of the vertebrae, it is difficult for the implanted intervertebral fusion device to closely adhere to the upper and lower cervical vertebrae, and it is easy for the fusion device to slip out between the vertebrae, resulting in the failure of the surgery. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a fusion device that can prevent the fusion device from slipping out between the vertebrae.

[0005] To solve the above technical problem, the present invention provides the following technical solutions:

[0006] A fusion device includes a fusion device main body. A nail placement window is provided on the rear side wall of the fusion device main body, and a spreading nail is provided in the nail placement window, wherein:

[0007] The spreading nail includes a vertical nail body and a transverse blocking rod perpendicular to the nail body and slidably engaged with the two inner side walls of the nail placement window. A through hole communicating with the nail placement window for the nail body to pass through is provided on the surface of the fusion device main body;

[0008] The nail placement window has an initial installation position and a spreading position. In the initial installation position, the end of the nail body of the spreading nail is located in the through hole and does not penetrate the surface of the fusion device main body; in the spreading position, the transverse blocking rod of the spreading nail is in interference fit with the two inner side walls of the nail placement window, and the end of the nail body of the spreading nail penetrates the surface of the fusion device main body through the through hole.

[0009] Furthermore, the nail placement window also has an intermediate transition position between the initial installation position and the spreading position. In the intermediate transition position, the transverse blocking rod of the spreading nail is in interference fit with the two inner side walls of the nail placement window, wherein:

[0010] The width of the nail placement window at the spreading position is greater than the width at the intermediate transition position;

[0011] And / or, the width of the nail-setting window at the initial installation position is greater than the width at the intermediate transition position.

[0012] Furthermore, the number of the nail-setting windows and the spreading nails is both two, and they are symmetrically distributed on both sides of the rear side wall of the fusion device body;

[0013] And / or, the cross bar is an arc bent away from the nail body;

[0014] And / or, grooves are provided on both sides of the end face of the cross bar away from the nail body;

[0015] And / or, the end of the nail body is a multi-edge structure, and the number of edges of the multi-edge structure is greater than or equal to 3;

[0016] And / or, a spreading nail installation hole is penetrated through the side wall of the nail-setting window opposite to the through hole.

[0017] Furthermore, a vertical bone graft cavity is provided in the middle of the fusion device body, horizontal through holes communicating with the bone graft cavity are provided on the left and right sides of the front part of the fusion device body, a wing is hinged in the horizontal through hole, the wing includes a hinged connection part hinged in the horizontal through hole, one end of the hinged connection part is provided with a wing plate part that can rotate after being driven to extend out of the side surface of the fusion device body, and accommodation grooves for accommodating the wing plate part when the wing plate part does not extend out are provided on the outer surfaces of the two side walls of the fusion device body.

[0018] Furthermore, an interference fit is provided between the hinged connection part and the horizontal through hole;

[0019] And / or, the other end of the hinged connection part is provided with a wing retraction driving part;

[0020] And / or, the front and rear surfaces of the hinged connection part are both arc surfaces;

[0021] And / or, the wing is Z-shaped.

[0022] Furthermore, an instrument connection hole is provided in the middle of the rear side wall of the fusion device body, and the instrument connection hole is a threaded hole.

[0023] Furthermore, a groove is provided on one side of the surface of the nail-setting window communicating with the through hole, and the groove penetrates through the surface of the rear side wall of the fusion device body.

[0024] Furthermore, the distance between the axis of the nail body and the rear surface of the cross bar is less than the distance between the axis of the nail body and the surface of the rear side wall of the fusion device body.

[0025] Furthermore, outer guide grooves are provided on the outer surfaces of the two side walls of the fusion device body, and the outer guide grooves are used as the accommodation grooves.

[0026] Furthermore, inner guide grooves are provided on two inner side walls of the fusion device main body, and sockets are provided at positions corresponding to the inner guide grooves in the screw placement window.

[0027] The present invention has the following beneficial effects:

[0028] For the fusion device of the present invention, the spreading screw in the screw placement window of the fusion device main body includes a vertical screw body and a horizontal blocking rod perpendicular to the screw body and slidably engaged with two inner side walls of the screw placement window. Through holes communicating with the screw placement window are provided on the surface of the fusion device main body for the screw body to pass through; in the spreading position of the spreading screw, the horizontal blocking rod of the spreading screw is in interference fit with two inner side walls of the screw placement window, and the end of the screw body of the spreading screw passes through the through hole and penetrates the surface of the fusion device main body. In this way, after the fusion device is implanted into a proper position, the spreading screw is driven to slide from the initial installation position to the spreading position, and the end of the spreading screw passes through the through hole and penetrates the surface of the fusion device main body and pierces into the vertebral body, increasing the stability after the fusion device is implanted, being able to prevent the fusion device from slipping out between the vertebral bodies, and the horizontal blocking rod of the spreading screw is in interference fit with two inner side walls of the screw placement window in the spreading position, preventing the spreading screw from coming off and ensuring the stability after the spreading screw pierces into the vertebral body. Description of the Drawings

[0029] Figure 1 is a schematic top cross-sectional structure view of the fusion device of the present invention;

[0030] Figure 2 is a schematic structure view of the spreading screw of the fusion device of the present invention before spreading, where (a) is a rear cross-sectional view, (b) is a side view, and (c) is a three-dimensional view;

[0031] Figure 3 is a schematic structure view of the spreading screw of the fusion device of the present invention when spreading Figure 1 , where (a) is a rear view, (b) is a rear cross-sectional view and an enlarged view at the screw placement window is additionally shown;

[0032] Figure 4 is a schematic structure view of the spreading screw of the fusion device of the present invention when spreading Figure 2 , where (a) is a three-dimensional view in one direction and (b) is a three-dimensional view in another direction;

[0033] Figure 5 is a schematic structure view of the spreading screw of the fusion device of the present invention;

[0034] Figure 6 is a schematic structure view of the fusion device of the present invention when the side wings are unfolded, where (a) is a top view and (b) is a three-dimensional view;

[0035] Figure 7 is a schematic structure view of the fusion device holder of the fusion device of the present invention;

[0036] Figure 8 Schematic diagram of the cooperation between the gripper of the fusion device of the present invention and the fusion device;

[0037] Figure 9 Schematic diagram of the structure of the spreader for the spreader nails of the fusion device of the present invention, where (a) is a side view and (b) is a top view;

[0038] Figure 10 Schematic diagram of the cooperation between the spreader for the spreader nails of the fusion device of the present invention and the gripper of the fusion device;

[0039] Figure 11 Schematic diagram of the cooperation among the spreader for the spreader nails, the gripper of the fusion device, and the fusion device of the present invention, where (a) is a side view and (b) is an enlarged view at the flat section of the main rod of the gripper of the fusion device;

[0040] Figure 12 Schematic diagram of the use state of the spreader for the spreader nails of the fusion device of the present invention;

[0041] Figure 13 Schematic diagram of the structure of the extractor for the spreader nails of the fusion device of the present invention, where (a) is a side view and (b) is a top view;

[0042] Figure 14 Schematic diagram of the use state of the extractor for the spreader nails of the fusion device of the present invention;

[0043] Figure 15 Schematic diagram of the structure of the wing spreader of the fusion device of the present invention, where (a) is a side view and (b) is a top view;

[0044] Figure 16 Schematic diagram of the cooperation between the wing spreader of the fusion device of the present invention and the gripper of the fusion device;

[0045] Figure 17 Schematic diagram of the use state of the wing spreader of the fusion device of the present invention;

[0046] Figure 18 Schematic diagram of the structure of the wing retractor of the fusion device of the present invention, where (a) is a side view and (b) is a top view;

[0047] Figure 19 Schematic diagram of the cooperation between the wing retractor of the fusion device of the present invention and the gripper of the fusion device;

[0048] Figure 20 Schematic diagram of the use state of the wing retractor of the fusion device of the present invention. Detailed implementation manners

[0049] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0050] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0051] The present invention provides a fusion device, such as Figures 1-6 As shown, it comprises a fusion device body 1, a rear side wall of which is provided with a nail placement window 11, and a distraction nail 2 is provided in the nail placement window 11, wherein:

[0052] The expansion nail 2 includes a vertical nail body 21 and a horizontal bar 22 which is perpendicular to the nail body 21 and slidably cooperates with the two inner side walls of the nail placement window 11. The surface of the fusion device body 1 is provided with a through hole 12 which is connected to the nail placement window 11 and allows the nail body 21 to pass through.

[0053] The nail placement window 11 has an initial installation position and an expansion position. In the initial installation position, the end of the nail body 21 of the expansion nail 2 is located in the through hole 12 and does not pass through the surface of the fusion device body 1; in the expansion position, the cross bar 22 of the expansion nail 2 is interference fit (tight fit) with the two inner side walls of the nail placement window 11, and the end of the nail body 21 of the expansion nail 2 passes through the surface of the fusion device body 1 through the through hole 12.

[0054] When used during surgery, first use the fusion device holder 4 to hold the fusion device and implant it to a suitable position, then use the expander nail expander 5 to drive the cross bar 22 of the expander nail 2, and the cross bar 22 slides within the two inner side walls of the nail placement window 11, so that the expander nail 2 slides from the initial installation position to the expanded position, and the end of the nail body 21 of the expander nail 2 passes through the surface of the fusion device body 1 through the through hole 12 and penetrates into the vertebral body, completing the implantation of the fusion device.

[0055] The fusion device of the present invention, the spreading nail in the nail-setting window of the fusion device main body includes a vertical nail body and a horizontal blocking bar perpendicular to the nail body and slidably engaged with the two inner side walls of the nail-setting window. A through hole communicating with the nail-setting window and allowing the nail body to pass through is provided on the surface of the fusion device main body; when the spreading nail is in the spreading position, the horizontal blocking bar of the spreading nail is in interference fit with the two inner side walls of the nail-setting window, and the end of the nail body of the spreading nail passes through the through hole and penetrates the surface of the fusion device main body. In this way, after the fusion device is implanted to the appropriate position, the spreading nail is driven to slide from the initial installation position to the spreading position, and the end of the spreading nail passes through the through hole and penetrates the surface of the fusion device main body and pierces into the vertebral body, increasing the stability after the fusion device is implanted, preventing the fusion device from slipping out between the vertebral bodies, and the horizontal blocking bar of the spreading nail is in interference fit with the two inner side walls of the nail-setting window in the spreading position, preventing the spreading nail from coming out and ensuring the stability after the spreading nail pierces into the vertebral body. The present invention is mainly applicable to the filling of the intervertebral space after disc resection in cervical spine surgery.

[0056] Further, the nail-setting window 11 may also have an intermediate transition position between the initial installation position and the spreading position. In the intermediate transition position, the horizontal blocking bar 22 of the spreading nail 2 is in interference fit with the two inner side walls of the nail-setting window 11.

[0057] As Figure 3 shown in (b) of the figure, the width L1 of the nail-setting window 11 in the spreading position is preferably greater than the width L2 in the intermediate transition position; the width L3 of the nail-setting window 11 in the initial installation position is preferably greater than the width L2 in the intermediate transition position, that is, the interference fit amount of the horizontal blocking bar 22 of the spreading nail 2 in the intermediate transition position is greater than that in the initial installation position and the spreading position. In this way, during the spreading process of the spreading nail 2, the horizontal blocking bar 22 moves from the initial installation position through the intermediate transition position to the spreading position, and the state of the horizontal blocking bar 22 in the nail-setting window 11 changes from loose to tight and then to loose, so as to ensure the stability of the spreading nail 2 in the final spreading state (spreading position). In the initial installation position, the horizontal blocking bar 22 of the spreading nail 2 may also be in interference fit with the two inner side walls of the nail-setting window 11 to prevent the spreading nail 2 from coming out of the nail-setting window 11 in the initial installation position.

[0058] As Figure 3 shown in the figure, the number of the nail-setting window 11 and the spreading nail 2 is preferably two and they are symmetrically distributed on both sides of the rear side wall of the fusion device main body 1, that is, the two spreading nails 2 are parallel to each other but in opposite directions. In this way, the two spreading nails 2 can respectively pierce into the upper and lower vertebral bodies after spreading, increasing the stability after the fusion device is implanted and better preventing the fusion device from slipping out between the vertebral bodies.

[0059] As Figure 5As shown, the cross bar 22 is preferably an arc bent away from the nail body 21, so that the cross bar 22 can be slightly elastically deformed under the extrusion of the two inner side walls of the nail placement window 11, facilitating the sliding fit between the cross bar 22 and the two inner side walls of the nail placement window 11. Grooves 23 can be provided on both sides of the end face of the cross bar 22 away from the nail body 21, which is more conducive to the elastic deformation of the cross bar 22. The end of the nail body 21 is preferably a multi-edge structure, and the number of edges of the multi-edge structure is greater than or equal to 3, so as to facilitate the smooth penetration into the vertebral body. A through-opening distraction nail mounting hole 13 can be provided through the side wall of the nail placement window 11 opposite to the through-hole 12 (the side wall away from the through-hole 12) to facilitate the installation of the distraction nail 2 by passing through.

[0060] During the research process, the inventor found that the contact area between the existing cervical fusion device and the vertebral body is limited, and the bone graft fusion area in the bone graft cavity of the fusion device is small, which is not conducive to fusion. To solve this problem, the present invention preferably adopts the following structural form:

[0061] As Figure 1 and Figure 6 shown, a vertical bone graft cavity 14 can be provided in the middle of the fusion device main body 1. Transverse through-holes 15 communicating with the bone graft cavity 14 are provided on the left and right sides of the front part of the fusion device main body 1. A wing 3 is hinged in the transverse through-hole 15. The wing 3 includes a hinged connection part 31 hinged in the transverse through-hole 15. One end of the hinged connection part 31 is provided with a wing plate part 32 that can rotate and extend out of the side of the fusion device main body 1 after being driven. Accommodating grooves 16 for accommodating the wing plate part 32 when the wing plate part 32 does not extend are provided on the outer surfaces of the two side walls of the fusion device main body 1.

[0062] When the fusion device is not implanted, the wing plate part 32 of the wing 3 is located in the accommodating groove 16, which will not increase the volume of the fusion device and will not cause difficulty in implantation. After the fusion device is implanted to a suitable position, the wing plate part 32 is driven to extend out of the side of the fusion device main body 1. At this time, bone grafting can be carried out on the side of the fusion device, increasing the bone grafting area and promoting bone fusion. Moreover, the wing plate part 32 can increase the transverse length of the fusion device, enhance the anti-rotation ability of the fusion device, and at the same time block the broken bone outside the fusion device from sliding into the posterior spinal canal.

[0063] In addition, compared with the structure in the prior art that the two wings are unfolded by pushing a moving block through a screw (such as patents CN215130934U, CN215130935U, etc.), in this embodiment, the wing plate part 32 can be directly pushed to unfold by the wing distractor 7 without setting a screw or a moving block, without occupying the volume of the bone graft cavity 14, and sufficient bone grafting can be carried out in the bone graft cavity 14, and the bone fusion effect is good.

[0064] Further, an interference fit is preferably provided between the hinge connection portion 31 and the transverse through-hole 15, that is, the height dimension of the hinge connection portion 31 and the height dimension of the transverse through-hole 15 are in an interference fit. In this way, during the unfolding process of the wing plate portion 32, the wing plate portion 32 can stop at any unfolding position and be stabilized at this position, facilitating use during the operation. Preferably, the maximum unfolding position is reached when the wing plate portion 32 unfolds to be parallel to the front and back surfaces of the fusion device body 1.

[0065] As Figure 1 shown, the other end of the hinge connection portion 31 may be provided with a wing retraction driving portion 33 to facilitate the retraction of the wing plate portion 32. At this time, driving the wing retraction driving portion 33 can retract the wing plate portion 32. The front and back surfaces of the hinge connection portion 31 are preferably arc-shaped to facilitate the rotation of the hinge connection portion 31. The wing 3 is preferably Z-shaped. An arc-shaped avoidance groove 151 for avoiding the wing retraction driving portion 33 may be provided on the front side wall of the transverse through-hole 15 to facilitate avoiding the wing retraction driving portion 33 and not interfering with the rotation of the wing retraction driving portion 33.

[0066] As Figure 1 shown, a device connection hole may be provided in the middle of the rear side wall of the fusion device body 1, and the device connection hole is a threaded hole 17. At this time, to facilitate the grasping of the fusion device, as Figure 7 shown, a fusion device gripper 4 is provided, which includes a main rod 41. The front end of the main rod 41 is provided with a screw rod section 42 that matches the threaded hole 17. The end surface of the main rod 41 provided with the screw rod section 42 is used to abut against the surface of the rear side wall of the fusion device body 1, and a handle 43 is provided at the rear end of the main rod 41. During use, hold the handle 43 and screw the screw rod section 42 at the front end of the main rod 41 into the threaded hole 17 on the rear side wall of the fusion device body 1.

[0067] As Figure 8 shown, the diameter D of the main rod 41 is preferably greater than the diameter d of the screw rod section 42. In this way, while increasing the strength, the force on the screw rod section 42 is dispersed, and when a series of operations such as spreading are performed on the fusion device after it is implanted into the human body, deformation failure of the screw rod section 42 caused by excessive force is avoided.

[0068] As Figures 7-8 shown, to balance the strength of the main rod 41 and facilitate insertion into the surgical incision, the main rod 41 may include a first rod portion 411 at the front and a second rod portion 412 at the rear. The diameter of the second rod portion 412 is greater than the diameter of the first rod portion 411. The screw rod section 42 is located at the front end of the first rod portion 411. The diameter of the first rod portion 411 is greater than the diameter of the screw rod section 42, and the end surface of the first rod portion 411 provided with the screw rod section 42 is used to abut against the rear side wall surface of the fusion device.

[0069] As Figures 9-12As shown in the figure, to facilitate the driving of the spreading nail 2 to spread, a spreading nail spreader 5 is provided. The spreading nail spreader 5 includes a first sleeve 51. A through hole for the main rod 41 of the fusion device gripper 4 to pass through is provided inside the first sleeve 51. A first U-shaped driving head 52 for inserting into the nail placement window 11 to drive the cross bar 22 is provided at the front end of the first sleeve 51.

[0070] During use, the first sleeve 51 of the spreading nail spreader 5 is installed on the main rod 41 of the fusion device gripper 4, so that the two side arms of the first U-shaped driving head 52 are respectively inserted into the nail placement windows 11 on both sides of the rear side wall of the fusion device main body 1 (refer to Figure 12 (a) in the figure), and the first sleeve 51 is rotated (refer to Figure 12 (b) in the figure). The two side arms of the first U-shaped driving head 52 respectively drive the cross bars 22 of the two spreading nails 2, so that the ends of the nail bodies 21 of the two spreading nails 2 pass through the through holes 12 and penetrate the surface of the fusion device main body 1.

[0071] As Figures 3-4 shown, a groove 18 can be provided on one side of the surface of the nail placement window 11 communicating with the through hole 12. The groove 18 penetrates the surface of the rear side wall of the fusion device main body 1; the distance between the axis of the nail body 21 and the rear surface of the cross bar 22 is preferably less than the distance between the axis of the nail body 21 and the rear side wall surface of the fusion device main body 1, so as to form an instrument abutment platform 19; at this time, to facilitate the driving of the spreading nail 2 to retract, as Figures 13-14 shown, a spreading nail extractor 6 is provided. The spreading nail extractor 6 includes an operating rod 61. The front end of the operating rod 61 serves as an abutting portion 62 that cooperates with the rear surface of the cross bar 22 and the rear side wall surface of the fusion device main body 1. A protrusion 63 for inserting into the groove 18 is provided on one side of the front end of the operating rod 61.

[0072] When it is necessary to retract the spreading nail 2, hold the operating rod 61 by hand, insert the protrusion 63 of the operating rod 61 into the groove 18, and make the abutting portion 62 of the operating rod 61 abut against the instrument abutment platform 19 to form a contact fulcrum. Rotate the operating rod 61 (clockwise) around this contact fulcrum, and the protrusion 63 drives the cross bar 22 of the spreading nail 2 in the retracting direction of the spreading nail 2, so as to retract the spreading nail 2 and facilitate the removal of the fusion device during the operation.

[0073] As Figure 13As shown, for the convenience of rotating the operating rod 61, the operating rod 61 can be Z-shaped and includes a first straight rod 611 at the front, a second straight rod 612 at the rear, and an inclined rod 613 connecting the first straight rod 611 and the second straight rod 612. The front end of the first straight rod 611 serves as the abutting portion 62, and a protrusion 63 is provided on one side of the front end of the first straight rod 611. A square connecting column 64 can be provided at the rear end of the second straight rod 612 to facilitate connection to the power device. A hand-held anti-slip sleeve 65 can be provided at the rear of the second straight rod 612, and a plurality of anti-slip ribs extending along its length direction can be provided on the hand-held anti-slip sleeve 65 to facilitate hand-held operation. The hand-held anti-slip sleeve 65 can be made of metal or silicone material.

[0074] As Figure 1 shown, outer guide grooves 16 can be provided on the outer surfaces of the two side walls of the fusion device main body 1. The outer guide grooves 16 serve as accommodation grooves. At this time, for the convenience of driving the wing plate portion 32 to extend / expand, as Figures 15-17 shown, a side wing spreader 7 is provided. The side wing spreader 7 includes a second sleeve 71. A through hole for the main rod 41 of the fusion device gripper 4 to pass through is provided in the second sleeve 71. A second U-shaped driving head 72 for inserting into the outer guide groove 16 to drive the wing plate portion 32 is provided at the front end of the second sleeve 71.

[0075] During use, the second sleeve 71 of the side wing spreader 7 is installed on the main rod 41 of the fusion device gripper 4, and the two side arms of the second U-shaped driving head 72 are respectively inserted into the outer guide grooves 16 on the outer surfaces of the two side walls of the fusion device main body 1. The second sleeve 71 is pushed forward, so that the two side arms of the second U-shaped driving head 72 gradually contact the inner side of the wing plate portion 32 and push the wing plate portion 32, so that the wing plate portion 32 slowly unfolds / spreads.

[0076] As Figures 1-4 shown, inner guide grooves 10 can be provided on the two inner side walls of the fusion device main body 1. A socket 111 is provided at a position corresponding to the inner guide groove 10 in the nail placement window 11. At this time, for the convenience of driving the wing plate portion 32 to retract, as Figures 18-20 shown, a side wing retractor 8 is provided. The side wing retractor 8 includes a third sleeve 81. A through hole for the main rod 41 of the fusion device gripper 4 to pass through is provided in the third sleeve 81. A third U-shaped driving head 82 for inserting into the inner guide groove 10 through the socket 111 to drive the side wing retraction driving portion 33 is provided at the front end of the third sleeve 81.

[0077] During use, the third sleeve 81 of the side wing retractor 8 is installed on the main rod 41 of the fusion device gripper 4, and the two side arms of the third U-shaped driving head 82 are respectively inserted into the inner guide groove 10 through the socket 111. The third sleeve 81 is pushed forward, so that the two side arms of the third U-shaped driving head 82 gradually contact the side wing retraction driving portion 33 and push the side wing retraction driving portion 33, so that the wing plate portion 32 slowly retracts / closes.

[0078] As Figure 7 and Figure 11 shown, a flat section 44 may be provided at the rear of the main rod 41. Each sleeve includes a sleeve main body portion and a positioning and mounting portion 100 located behind the sleeve main body portion for sleeving on the main rod 41 from the flat section 44. The cross-section of the sleeve main body portion is semi-circular (semi-open structure), and the cross-section of the positioning and mounting portion 100 is an arc larger than a semi-circle. In this way, after the fusion device gripper 4 grips the fusion device, the two do not need to be disassembled, which facilitates the replacement of various instruments (such as the spreader nail spreader 5, the side wing spreader 7, the side wing retractor 8), and is convenient for intraoperative use. When in use, the positioning and mounting portion 100 of the sleeve is sleeved onto the main rod 41 along the flat section 44 of the main rod 41, and the sleeve is pushed forward, then the sleeve main body portion can tightly adhere to the main rod 41. A driving wrench 9 may be provided on the positioning and mounting portion 100 to facilitate driving the sleeve.

[0079] As Figure 7 shown, a threaded section 45 may be provided in front of the flat section 44 at the rear of the main rod 41. A knob 46 that can cooperate with the threaded section 45 is slidably connected to the main rod 41, so as to accurately drive each sleeve to move forward, thereby preferably limiting the positions of the sleeves on the main rod 41.

[0080] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle described in the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A fuser, comprising a fuser main body, characterized in that, A nail placement window is provided on the rear side wall of the main body of the fusion device, and a spreading nail is provided in the nail placement window, where: The spreading nail includes a vertical nail body and a horizontal blocking rod perpendicular to the nail body and slidably engaged with the two inner side walls of the nail placement window. A through hole communicating with the nail placement window for the nail body to pass through is provided on the surface of the main body of the fusion device; The nail placement window has an initial installation position and a spreading position. In the initial installation position, the end of the nail body of the spreading nail is located in the through hole and does not penetrate the surface of the main body of the fusion device; in the spreading position, the horizontal blocking rod of the spreading nail is in interference fit with the two inner side walls of the nail placement window, and the end of the nail body of the spreading nail penetrates the surface of the main body of the fusion device through the through hole; A vertical bone graft cavity is provided in the middle of the main body of the fusion device. Transverse through holes communicating with the bone graft cavity are provided on the left and right sides of the front part of the main body of the fusion device. A wing is hinged in the transverse through hole. The wing includes a hinged connection part hinged in the transverse through hole. One end of the hinged connection part is provided with a wing plate part that can rotate after being driven to extend out of the side surface of the main body of the fusion device. The wing plate part can be directly pushed by a wing spreader to unfold. Accommodating grooves for accommodating the wing plate part when the wing plate part does not extend are provided on the outer surfaces of the two side walls of the main body of the fusion device.

2. The fuser according to claim 1, characterized in that, The nail placement window also has an intermediate transition position between the initial installation position and the spreading position. In the intermediate transition position, the horizontal blocking rod of the spreading nail is in interference fit with the two inner side walls of the nail placement window, where: The width of the nail placement window at the spreading position is greater than the width at the intermediate transition position; And / or, the width of the nail placement window at the initial installation position is greater than the width at the intermediate transition position.

3. The fuser according to claim 1, characterized in that, The horizontal blocking rod is an arc bent away from the nail body; And / or, grooves are provided on both sides of the end face of the horizontal blocking rod away from the nail body; And / or, the end of the nail body is a multi-edge structure, and the number of edges of the multi-edge structure is greater than or equal to 3; And / or, a spreading nail installation hole is provided through the side wall of the nail placement window opposite to the through hole.

4. The fuser according to claim 1, characterized in that, The interference fit exists between the hinged connection part and the transverse through hole; And / or, the front and rear surfaces of the hinged connection part are both arc surfaces; And / or, the wing is Z-shaped.

5. The fuser according to any one of claims 1-4, characterized in that, An instrument connection hole is provided in the middle of the rear side wall of the main body of the fusion device, and the instrument connection hole is a threaded hole; the fusion device further includes a fusion device holder. The fusion device holder includes a main rod. A screw rod section matched with the threaded hole is provided at the front end of the main rod. The end face of the main rod provided with the screw rod section is used to abut against the surface of the rear side wall of the main body of the fusion device, and a handle is provided at the rear end of the main rod.

6. The fuser according to claim 5, characterized in that, The number of the nail placement window and the spreading nail is two each and they are symmetrically distributed on both sides of the rear side wall of the main body of the fusion device; the fusion device further includes a spreading nail spreader. The spreading nail spreader includes a first sleeve. A through hole for the main rod of the fusion device holder to pass through is provided in the first sleeve. A first U-shaped driving head for inserting into the nail placement window to drive the horizontal blocking rod is provided at the front end of the first sleeve.

7. The fuser according to claim 5, characterized in that, A groove is provided on one side of the surface of the nail placement window communicating with the through hole, and the groove penetrates the surface of the rear side wall of the fusion device body; the distance between the axis of the nail body and the rear surface of the cross bar is less than the distance between the axis of the nail body and the surface of the rear side wall of the fusion device body, so as to form an instrument abutment table; the fusion device further includes a spreader nail extractor, and the spreader nail extractor includes an operating rod. The front end of the operating rod serves as an abutting portion that cooperates with the rear surface of the cross bar and the surface of the rear side wall of the fusion device body, and a protrusion for inserting into the groove is provided on one side of the front end of the operating rod.

8. The fuser according to claim 5, characterized in that, Outer guide grooves are provided on the outer surfaces of the two side walls of the fusion device body, and the outer guide grooves serve as the accommodating grooves; the fusion device further includes a wing spreader, and the wing spreader includes a second sleeve. A through hole for the main rod of the fusion device gripper to pass through is provided in the second sleeve, and a second U-shaped driving head for inserting into the outer guide groove to drive the wing plate portion is provided at the front end of the second sleeve.

9. The fuser according to claim 5, characterized in that, The other end of the hinge connection portion is provided with a wing retraction driving portion; inner guide grooves are provided on the two inner side walls of the fusion device body, and sockets are provided at positions corresponding to the inner guide grooves in the nail placement window; the fusion device further includes a wing retractor, and the wing retractor includes a third sleeve. A through hole for the main rod of the fusion device gripper to pass through is provided in the third sleeve, and a third U-shaped driving head for inserting into the inner guide groove through the socket to drive the wing retraction driving portion is provided at the front end of the third sleeve.

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