A minimally invasive spinal fusion device

Abstract

The invention discloses a minimally invasive spinal endoscopic repositioning fusion device, belonging to the field of medical equipment technology. The minimally invasive spinal endoscopic repositioning fusion device comprises an upper base and a lower base, wherein the upper base is slidably connected above the lower base, an upper inclined plate is arranged at the bottom of the upper base, a lower inclined plate is arranged at the top of the lower base, the upper inclined plate inclined surface is fitted with the lower inclined plate inclined surface, the lower base is symmetrically rotated and connected with a side expansion mechanism on both sides, the front side of the lower base is slidably connected with a top expansion mechanism, the lower base is rotatably connected with a threaded rod, the upper base is threadedly connected with the threaded rod, and the threaded rod rotation can drive the upper base to slide above the lower base. The invention can be implanted through a small incision in a folded state, can be expanded after entering the intervertebral space, can not only be raised in the vertical direction, can well support the intervertebral space, but also can be fanned out in the horizontal plane, and well match the anatomical structure of the intervertebral space.

Description

Technical Field

[0001] The invention belongs to the technical field of medical equipment, and in particular relates to a minimally invasive spinal endoscopic reduction fusion device. Background Art

[0002] Intervertebral fusion cage is a medical device used in spinal surgery to treat various spinal diseases, mainly used in intervertebral fusion surgery. It is designed to restore the height of the intervertebral space, expand the intervertebral foramen, relieve nerve compression symptoms, enhance the stability of the spinal segments, and avoid secondary degenerative changes in adjacent segments. Intervertebral fusion cages have a wide range of applications, including but not limited to intervertebral disc degeneration, spinal instability, disc herniation, spondylolisthesis, spinal tumors, vertebral fractures and spinal deformities.

[0003] With the advancement of technology, intervertebral fusion nowadays mostly uses minimally invasive spinal endoscopic surgery. This type of surgery has a small incision and less damage to surrounding tissues. Small incisions reduce the possibility of infection, less bleeding during surgery, less postoperative pain, and patients can return to normal life and work more quickly. However, this requires the fusion device to be as small as possible so that it can pass through a small incision. However, small fusion devices not only have a single function, but also cannot support the intervertebral space well, and cannot match the anatomical structure of the intervertebral space well. In addition, they cannot be lifted and reduced under the microscope for patients with spondylolisthesis, which can easily cause adverse effects on the surgery and increase the difficulty of postoperative recovery. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a minimally invasive spinal endoscopic reduction fusion device. The present invention can be implanted through a small incision in a folded state and can be expanded after entering the intervertebral space. It can not only be raised in the vertical direction, but also support the intervertebral space well and reduce the slipped vertebral body. It can also be fan-shaped in the horizontal plane, well matching the anatomical structure of the intervertebral space, increasing the cross-sectional area of ​​the fusion device, increasing the contact area between the fusion device and the intervertebral space, and effectively ensuring the stability of the fusion device support.

[0005] The technical solution adopted to solve the above technical problems is: a minimally invasive spinal endoscopic reduction fusion device, comprising an upper base and a lower base, the upper base is slidably connected above the lower base, an upper inclined plate is arranged at the bottom of the upper base, a lower inclined plate is arranged at the top of the lower base, the inclined surface of the upper inclined plate is in contact with the inclined surface of the lower inclined plate, the two sides of the lower base are symmetrically rotatably connected with side expansion mechanisms, the front side of the lower base is slidably connected with a top expansion mechanism, a threaded rod is rotatably connected on the lower base, the upper base is threadedly connected with the threaded rod, and the rotation of the threaded rod can drive the upper base to slide above the lower base;

[0006] The upper base slides above the lower base to drive the side expansion mechanism to fold or unfold;

[0007] The upper base slides above the lower base to drive the top expansion mechanism to slide horizontally.

[0008] With the above technical scheme, the fusion device is in a folded state when the fusion device is implanted. After the fusion device is implanted in place, the lower base is clamped and fixed, and the threaded rod is rotated to drive the upper base to slide backward over the lower base, and the inclined surface of the upper inclined plate fits with the inclined surface of the lower inclined plate, and the upper base slides along the inclined surface, so that the upper base is horizontally displaced above the lower base while the vertical height of the upper base increases, and the height of the upper base reaches an appropriate position. The upper base and the lower base are stuck in the intervertebral space to effectively support the intervertebral space, and when the upper base slides backward over the lower base, the side expansion mechanism expands fan-shaped to the side, and the top expansion mechanism slides forward horizontally, thereby increasing the cross-sectional area of ​​the fusion device and the contact area between the fusion device and the intervertebral space, thereby effectively ensuring the stability of the fusion device support, and the side expansion mechanism expands fan-shaped to the side to cooperate with the lower base and the top expansion mechanism, which can well match the anatomical structure of the intervertebral space and further ensure the stability of the fusion device support.

[0009] Furthermore, a vertical rail is fixedly provided at the front end of the upper base, a vertical plate is slidably connected to the vertical rail, the threaded rod passes through the vertical plate, and the vertical plate is threadedly connected to the threaded rod.

[0010] Through the above technical scheme, since the front end of the upper base is fixedly provided with a vertical rail, the vertical plate is slidably connected to the vertical rail, the threaded rod penetrates the vertical plate, and the vertical plate is threadedly connected to the threaded rod, so that the rotation of the threaded rod can drive the vertical plate to slide horizontally, and the horizontal sliding of the vertical plate can drive the upper base to slide horizontally. When the upper base slides backward over the lower base, the upper base rises along the inclined plane, and the vertical rail and the vertical plate move away from each other, and finally the upper base and the lower base are in an expanded state, and when the upper base slides forward over the lower base, the upper base descends along the inclined plane, and the vertical rail and the vertical plate move closer to each other, and finally the vertical plate is completely stored in the vertical rail, and the upper base and the lower base are in a folded state.

[0011] Furthermore, the side expansion mechanism is composed of two groups symmetrically arranged on both sides of the lower base, and the side expansion mechanism includes a first expansion rod and a second expansion rod. The rear ends of both sides of the lower base are fixedly connected with rotating columns, and the rear ends of the first expansion rod and the second expansion rod are rotatably connected to the rotating columns.

[0012] Through the above technical solution, since the side expansion mechanism includes a first expansion rod and a second expansion rod, the rear ends of both sides of the lower base are fixedly connected with rotating columns, and the rear ends of the first expansion rod and the second expansion rod are rotatably connected to the rotating columns, when the side expansion mechanism is in a folded state, the first expansion rod and the second expansion rod are close together, effectively reducing the space occupied by the side expansion mechanism, and when the side expansion mechanism is in a folded state, the fan-shaped expansion of the side expansion mechanism can be achieved by only rotating the first expansion rod and the second expansion rod at different angles, and the number of expansion rods can be increased according to actual usage conditions to increase the expansion area.

[0013] Furthermore, a sleeve is fixedly provided between the first extension rod and the second extension rod, a limit rod is slidably connected inside the sleeve, limit plates are symmetrically fixedly provided on both sides of the upper base, limit grooves are provided on the limit plates, and the top of the limit rod is slidably connected to the limit groove.

[0014] The cam is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams,

[0015] When the upper base slides backward on the lower base, the upper base rises along the inclined surface, and the limit rod rises accordingly. When the upper base slides forward on the lower base, the upper base descends along the inclined surface, and the limit rod descends accordingly. Finally, the limit rod is completely stored in the sleeve, and the upper base and the lower base are in a folded state, and the side expansion mechanism is also in a folded state, which effectively reduces the space occupied by the side expansion mechanism.

[0016] Furthermore, a first expansion frame is fixedly disposed on one side of the front end of the first expansion rod, and a second expansion frame is fixedly disposed on one side of the front end of the second expansion rod, and the first expansion frame can be inserted into the second expansion frame.

[0017] Through the above technical solution, since a first expansion frame is fixedly provided on one side of the front end of the first expansion rod, and a second expansion frame is fixedly provided on one side of the front end of the second expansion rod, the first expansion frame can be inserted into the second expansion frame, so that when the side expansion mechanism is in a folded state, the space occupied by the side expansion mechanism is minimized, and when the side expansion mechanism is unfolded, the first expansion frame and the second expansion frame can effectively enhance the support strength and support stability of the side expansion mechanism.

[0018] Furthermore, the top expansion mechanism includes an arc-shaped frame, a driving plate, a fan-shaped expansion component and a torsion spring. The driving plate is fixedly connected to the middle of the rear end of the arc-shaped frame. Vertical poles are symmetrically fixed on both sides of the arc-shaped frame. The fan-shaped expansion component is symmetrically arranged in two groups on both sides of the arc-shaped frame. The fan-shaped expansion component is rotatably connected to the vertical pole, and the torsion spring is fixedly arranged at the connection between the fan-shaped expansion component and the vertical pole.

[0019] Through the above technical solution, since the vertical poles are symmetrically fixedly arranged on both sides of the arc frame, the fan-shaped expansion components are symmetrically arranged in two groups on both sides of the arc frame, the fan-shaped expansion components are rotatably connected to the vertical poles, and the torsion springs are fixedly arranged at the connection between the fan-shaped expansion components and the vertical poles, so that the fan-shaped expansion components can be folded in the arc frame, and the torsion springs can be set to bounce the fan-shaped expansion components to help the fan-shaped expansion components unfold;

[0020] When the side expansion mechanism is in a folded state, the second expansion rods on the two side expansion mechanisms can clamp and fix the fan-shaped expansion component in the arc frame to achieve the folding of the top expansion mechanism. When the side expansion mechanism is in an unfolded state, the second expansion rods on the two side expansion mechanisms move away from each other, so that the fan-shaped expansion component can be unfolded.

[0021] Furthermore, a dovetail groove is provided at the bottom of the arc-shaped frame, and a guide rail is fixedly provided at the front end of the lower base, and the dovetail groove can slide horizontally on the guide rail.

[0022] Through the above technical solution, since a dovetail groove is provided at the bottom of the arc frame and a guide rail is fixedly provided at the front end of the lower base, the dovetail groove can slide horizontally on the guide rail, so that the arc frame can slide horizontally at the front end of the lower base without detaching from the lower base.

[0023] Furthermore, a bracket is fixedly connected to the lower base, the threaded rod passes through the bracket and the rear side wall of the lower base, the threaded rod is rotatably connected to the bracket, the front end of the threaded rod passes through a driving plate, the driving plate is threadedly connected to the front end of the threaded rod, the driving plate is arranged on the front side of the bracket, the vertical plate is arranged on the rear side of the bracket, and the thread on the front side of the bracket on the threaded rod is opposite to the thread on the rear side of the bracket.

[0024] Through the above technical solution, since the front end of the threaded rod passes through the driving plate, the driving plate is threadedly connected to the front end of the threaded rod, the driving plate is arranged on the front side of the bracket, and the vertical plate is arranged on the rear side of the bracket. The thread on the front side of the bracket on the threaded rod is opposite to the thread on the rear side of the bracket, so that when the threaded rod rotates, the driving plate slides horizontally along the direction of the threaded rod, that is, drives the top expansion mechanism to slide horizontally along the direction of the threaded rod;

[0025] The front thread of the bracket on the threaded rod is opposite to the rear thread of the bracket, so that when the threaded rod rotates forward to drive the upper base to slide backward on the lower base, the top expansion mechanism slides forward on the lower base, and when the threaded rod rotates reversely to drive the upper base to slide forward on the lower base, the top expansion mechanism slides backward on the lower base, that is, when the upper base and the lower base are in the expanded state, the top expansion mechanism moves forward and the top expansion mechanism is in the expanded state, and when the upper base and the lower base are in the folded state, the top expansion mechanism moves backward and resets, and the top expansion mechanism is also in the folded state.

[0026] Furthermore, an adjustment groove is provided at the rear end of the threaded rod, and the adjustment groove is arranged outside the rear side wall of the lower base.

[0027] Through the above technical solution, since the rear end of the threaded rod is provided with an adjustment groove, and the adjustment groove is arranged outside the rear side wall of the lower base, after the lower base is clamped and fixed, the threaded rod can be conveniently rotated using a tool with a screwdriver bit matching the adjustment groove, thereby driving the intervertebral fusion device to be unfolded or folded.

[0028] The beneficial effects of the present invention are as follows:

[0029] (1) In the present invention, after the fusion device is implanted in place, the lower base is clamped and fixed, and the threaded rod is rotated to drive the upper base to slide backward above the lower base, and the upper inclined plate inclined surface is fitted with the lower inclined plate inclined surface, and the upper base slides along the inclined surface, so that the upper base is horizontally displaced above the lower base while the vertical height of the upper base increases, and the height of the upper base reaches an appropriate position. The upper base and the lower base are stuck in the intervertebral space, effectively supporting the intervertebral space, and when the upper base slides backward above the lower base, vertebral slip can be corrected, the side expansion mechanism expands to the side in a fan shape, and the top expansion mechanism slides forward horizontally, thereby increasing the cross-sectional area of ​​the fusion device and the contact area between the fusion device and the intervertebral space, thereby effectively ensuring the stability of the fusion device support;

[0030] (2) The lateral expansion mechanism of the present invention expands in a fan-shaped manner to the side and cooperates with the lower base and the top expansion mechanism to well match the anatomical structure of the intervertebral disc and further ensure the stability of the fusion device support;

[0031] (3) In the present invention, when the upper base and the lower base are in a folded state, the side expansion mechanism is in a folded state, the top expansion mechanism is displaced backward and reset, and the top expansion mechanism is also in a folded state. At this time, the vertical plate is completely stored in the vertical rail, the limit rod is completely stored in the sleeve, the first expansion frame is inserted into the second expansion frame, and the fan-shaped expansion component is clamped and fixed in the arc frame, which effectively reduces the space occupied by the intervertebral fusion device and facilitates the implantation of the intervertebral fusion device through a small incision. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of a minimally invasive spinal endoscopic reduction fusion device of the present invention when it is deployed from a first-view perspective;

[0033] Figure 2 It is a second-view structural schematic diagram of a minimally invasive spinal endoscopic reduction fusion device of the present invention when it is deployed;

[0034] Figure 3 It is a schematic diagram of the structure of a minimally invasive spinal endoscopic reduction fusion device of the present invention when folded from a first-view perspective;

[0035] Figure 4 It is a schematic diagram of the structure of a minimally invasive spinal endoscopic reduction fusion device of the present invention when folded from a second viewing angle;

[0036] Figure 5 It is a structural schematic diagram of the cooperation between the upper base and the lower base when the minimally invasive spinal endoscopic reduction fusion device of the present invention is deployed;

[0037] Figure 6 It is a structural schematic diagram of the cooperation between the upper base and the lower base of a minimally invasive spinal endoscopic reduction fusion device of the present invention when folding;

[0038] Figure 7 It is a schematic diagram of the exploded structure of the upper base and the lower base of a minimally invasive spinal endoscopic reduction fusion device according to the present invention;

[0039] Figure 8 It is a structural schematic diagram of the cooperation between the upper base and the side expansion mechanism of a minimally invasive spinal endoscopic reduction fusion device of the present invention;

[0040] Fig. 9 It is a structural schematic diagram of a minimally invasive spinal endoscopic reduction fusion device of the present invention when the side expansion mechanism is deployed;

[0041] Fig.10 It is a structural schematic diagram of a lateral expansion mechanism of a minimally invasive spinal endoscopic reduction fusion device of the present invention when it is folded;

[0042] Fig.11 It is a schematic diagram of the exploded structure of a first extension rod of a minimally invasive spinal endoscopic reduction fusion device of the present invention;

[0043] Fig.12 It is a schematic diagram of the exploded structure of a second extension rod of a minimally invasive spinal endoscopic reduction fusion device of the present invention;

[0044] Fig.13 It is a structural schematic diagram of a lower base of a minimally invasive spinal endoscopic reduction fusion device of the present invention;

[0045] Fig.14 It is a structural schematic diagram of a minimally invasive spinal endoscopic reduction fusion device of the present invention when the top expansion mechanism is folded;

[0046] Fig.15It is a structural schematic diagram of a minimally invasive spinal endoscopic reduction fusion device of the present invention when the top expansion mechanism is deployed;

[0047] Fig.16 It is a schematic diagram of the exploded structure of a top expansion mechanism of a minimally invasive spinal endoscopic reduction fusion device of the present invention;

[0048] Fig.17 The present invention is a structural schematic diagram of a threaded rod of a minimally invasive spinal endoscopic reduction fusion device.

[0049] : 1. upper base; 2. lower base; 3. side expansion mechanism; 4. top expansion mechanism; 5. threaded rod; 11. limit plate; 12. vertical plate; 13. upper inclined plate; 111. limit groove; 121. vertical rail; 21. rotating column; 22. bracket; 23. guide rail; 24. lower inclined plate; 31. first expansion rod; 32. second expansion rod; 33. sleeve; 34. limit rod; 311. first expansion frame; 321. second expansion frame; 41. arc frame; 42. drive plate; 43. fan-shaped expansion component; 44. torsion spring; 411. vertical rod; 412. dovetail groove; 51. adjustment groove. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0051] like Figure 1 - Figure 4 As shown, a minimally invasive spinal endoscopic reduction fusion device comprises an upper base 1 and a lower base 2, wherein the upper base 1 is slidably connected to the upper part of the lower base 2, an upper inclined plate 13 is provided at the bottom of the upper base 1, and a lower inclined plate 24 is provided at the top of the lower base 2, wherein the inclined surface of the upper inclined plate 13 is fitted with the inclined surface of the lower inclined plate 24, and the lower base 2 is symmetrically rotatably connected to the side expansion mechanism 3 on both sides, and the front side of the lower base 2 is slidably connected to the top expansion mechanism 4, and the lower base 2 is rotatably connected to a threaded rod 5, and the upper base 1 is threadedly connected to the threaded rod 5, and the threaded rod 5 can drive the upper base 1 to slide above the lower base 2 by rotating;

[0052] The upper base 1 slides above the lower base 2 to drive the side expansion mechanism 3 to fold or unfold;

[0053] The upper base 1 slides above the lower base 2 to drive the top expansion mechanism 4 to slide horizontally.

[0054] When the fusion device is implanted, it is in a folded state. After the fusion device is implanted in place, the lower base 2 is clamped and fixed, and the threaded rod 5 is rotated to drive the upper base 1 to slide backward over the lower base 2. The inclined surface of the upper inclined plate 13 fits the inclined surface of the lower inclined plate 24, and the upper base 1 slides along the inclined surface, so that the upper base 1 is horizontally displaced above the lower base 2 while the vertical height of the upper base 1 increases, and the height of the upper base 1 reaches an appropriate position. The upper base 1 and the lower base 2 are stuck in the intervertebral space to effectively support the intervertebral space, and when the upper base 1 slides backward over the lower base 2, the side expansion mechanism 3 expands in a fan-shaped manner to the side, and the top expansion mechanism 4 slides forward horizontally to increase the cross-sectional area of ​​the fusion device and the contact area between the fusion device and the intervertebral space, thereby effectively ensuring the stability of the fusion device support. The side expansion mechanism 3 expands in a fan-shaped manner to the side to cooperate with the lower base 2 and the top expansion mechanism 4, which can well match the anatomical structure of the intervertebral space and further ensure the stability of the fusion device support.

[0055] like Figure 5 - Figure 7 As shown, a vertical rail 121 is fixedly provided at the front end of the upper base 1 , a vertical plate 12 is slidably connected to the vertical rail 121 , a threaded rod 5 passes through the vertical plate 12 , and the vertical plate 12 is threadedly connected to the threaded rod 5 .

[0056] In this embodiment, the rotation of the threaded rod 5 can drive the vertical plate 12 to slide horizontally, and the horizontal sliding of the vertical plate 12 can drive the upper base 1 to slide horizontally. When the upper base 1 slides backward over the lower base 2, the upper base 1 rises along the inclined surface, and the vertical rail 121 and the vertical plate 12 move away from each other. Finally, the upper base 1 and the lower base 2 are in an unfolded state. When the upper base 1 slides forward over the lower base 2, the upper base 1 descends along the inclined surface, and the vertical rail 121 and the vertical plate 12 move closer to each other. Finally, the vertical plate 12 is completely stored in the vertical rail 121, and the upper base 1 and the lower base 2 are in a folded state.

[0057] like Figure 8 - Fig.13 As shown, the side expansion mechanism 3 is symmetrically arranged in two groups on both sides of the lower base 2, and the side expansion mechanism 3 includes a first expansion rod 31 and a second expansion rod 32. The rear ends of both sides of the lower base 2 are fixedly connected with the rotating column 21, and the rear ends of the first expansion rod 31 and the second expansion rod 32 are rotatably connected to the rotating column 21;

[0058] A sleeve 33 is fixedly arranged between the first extension rod 31 and the second extension rod 32, and a limiting rod 34 is slidably connected inside the sleeve 33. Limiting plates 11 are symmetrically fixedly arranged on both sides of the upper base 1, and limiting grooves 111 are arranged on the limiting plates 11. The top of the limiting rod 34 is slidably connected to the limiting grooves 111, and the limiting grooves 111 are oblique grooves. The limiting grooves 111 matched with the first extension rod 31 and the limiting grooves 111 matched with the second extension rod 32 have different inclination angles;

[0059] A first expansion frame 311 is fixedly disposed on one side of the front end of the first expansion rod 31 , and a second expansion frame 321 is fixedly disposed on one side of the front end of the second expansion rod 32 . The first expansion frame 311 can be inserted into the second expansion frame 321 .

[0060] In this embodiment, when the upper base 1 slides backward on the lower base 2, the limiting rod 34 slides in the limiting groove 111, and the limiting groove 111 is an inclined groove, and the limiting groove 111 matched with the first expansion rod 31 and the limiting groove 111 matched with the second expansion rod 32 have different inclination angles, resulting in the limiting rod 34 on the first expansion rod 31 and the limiting rod 34 on the second expansion rod 32 being displaced in the horizontal plane, and the spacing between the limiting rod 34 on the first expansion rod 31 and the limiting rod 34 on the second expansion rod 32 also changes, so that the first expansion rod 31 and the second expansion rod 32 are rotated at different angles, that is, the side expansion mechanism 3 is unfolded, and conversely, when the upper base 1 slides horizontally forward above the lower base 2, the limiting rod 34 slides in the limiting groove 111, driving the first expansion rod 31 and the second expansion rod 32 to reset, so as to realize the folding of the side expansion mechanism 3;

[0061] When the upper base 1 slides backward on the lower base 2, the upper base 1 rises along the inclined surface, and the limiting rod 34 rises accordingly. When the upper base 1 slides forward on the lower base 2, the upper base 1 descends along the inclined surface, and the limiting rod 34 descends accordingly. Finally, the limiting rod 34 is completely stored in the sleeve 33, and the upper base 1 and the lower base 2 are in a folded state, and the side expansion mechanism 3 is also in a folded state, which effectively reduces the space occupied by the side expansion mechanism 3.

[0062] The first expansion frame 311 can be inserted into the second expansion frame 321, so that when the side expansion mechanism 3 is in a folded state, the space occupied by the side expansion mechanism 3 is minimized. When the side expansion mechanism 3 is unfolded, the first expansion frame 311 and the second expansion frame 321 can effectively enhance the support strength and support stability of the side expansion mechanism 3.

[0063] like Fig.13 - Fig.17 As shown, the top expansion mechanism 4 includes an arc frame 41, a driving plate 42, a fan-shaped expansion component 43 and a torsion spring 44. The driving plate 42 is fixedly connected to the middle of the rear end of the arc frame 41. Vertical poles 411 are symmetrically fixedly arranged on both sides of the arc frame 41. The fan-shaped expansion components 43 are symmetrically arranged on both sides of the arc frame 41 in two groups. The fan-shaped expansion components 43 are rotatably connected to the vertical poles 411, and the torsion spring 44 is fixedly arranged at the connection between the fan-shaped expansion components 43 and the vertical poles 411.

[0064] A dovetail groove 412 is provided at the bottom of the arc-shaped frame 41, and a guide rail 23 is fixedly provided at the front end of the lower base 2, and the dovetail groove 412 can slide horizontally on the guide rail 23;

[0065] A bracket 22 is fixedly connected to the lower base 2, and the threaded rod 5 passes through the bracket 22 and the rear side wall of the lower base 2. The threaded rod 5 is rotatably connected to the bracket 22. The front end of the threaded rod 5 passes through the driving plate 42, and the driving plate 42 is threadedly connected to the front end of the threaded rod 5. The driving plate 42 is arranged on the front side of the bracket 22, and the vertical plate 12 is arranged on the rear side of the bracket 22. The thread on the front side of the bracket 22 on the threaded rod 5 is opposite to the thread on the rear side of the bracket 22.

[0066] In this embodiment, when the side expansion mechanism 3 is in a folded state, the second expansion rods 32 on the two side expansion mechanisms 3 can clamp and fix the fan-shaped expansion component 43 in the arc-shaped frame 41 to achieve the folding of the top expansion mechanism 4, and when the side expansion mechanism 3 is in an unfolded state, the second expansion rods 32 on the two side expansion mechanisms 3 are away from each other, leaving space for the fan-shaped expansion component 43 to unfold, and the torsion spring 44 can bounce the fan-shaped expansion component 43 so that the fan-shaped expansion component 43 can be unfolded;

[0067] When the threaded rod 5 rotates, the driving plate 42 slides horizontally along the direction of the threaded rod 5, that is, the top expansion mechanism 4 is driven to slide horizontally along the direction of the threaded rod 5;

[0068] The front thread of the bracket 22 on the threaded rod 5 is opposite to the rear thread of the bracket 22, so that when the threaded rod 5 rotates forward to drive the upper base 1 to slide backward on the lower base 2, the top expansion mechanism 4 slides forward on the lower base 2, and when the threaded rod 5 rotates reversely to drive the upper base 1 to slide forward on the lower base 2, the top expansion mechanism 4 slides backward on the lower base 2, that is, when the upper base 1 and the lower base 2 are in the expanded state, the top expansion mechanism 4 moves forward and the top expansion mechanism 4 is in the expanded state, and when the upper base 1 and the lower base 2 are in the folded state, the top expansion mechanism 4 moves backward and resets, and the top expansion mechanism 4 is also in the folded state.

[0069] like Figure 1 and Fig.17 As shown, an adjustment groove 51 is provided at the rear end of the threaded rod 5 , and the adjustment groove 51 is arranged outside the rear side wall of the lower base 2 .

[0070] In this embodiment, after the lower base 2 is clamped and fixed, the threaded rod 5 can be conveniently rotated using a tool with a screwdriver bit matching the adjustment slot 51, thereby driving the intervertebral fusion cage to be unfolded or folded.

[0071] Working principle:

[0072] During operation, the fusion device is in a folded state when the fusion device is implanted. After the fusion device is implanted in place, the lower base 2 is clamped and fixed, and the threaded rod 5 is rotated using a tool with a screwdriver bit that matches the adjustment slot 51;

[0073] The rotation of the threaded rod 5 can drive the vertical plate 12 to slide horizontally, and the horizontal sliding of the vertical plate 12 can drive the upper base 1 to slide horizontally. The positive rotation of the threaded rod 5 can drive the upper base 1 to slide backward above the lower base 2. The upper base 1 rises along the inclined plane, and the vertical rail 121 and the vertical plate 12 move away from each other. Finally, the upper base 1 and the lower base 2 are in an unfolded state.

[0074] The limiting rod 34 slides in the limiting groove 111, and the limiting groove 111 is an oblique groove, and the limiting groove 111 matched with the first expansion rod 31 and the limiting groove 111 matched with the second expansion rod 32 have different inclination angles, resulting in displacement of the limiting rod 34 on the first expansion rod 31 and the limiting rod 34 on the second expansion rod 32 in the horizontal plane, and the spacing between the limiting rod 34 on the first expansion rod 31 and the limiting rod 34 on the second expansion rod 32 also changes, so that the first expansion rod 31 and the second expansion rod 32 can rotate at different angles, that is, the side expansion mechanism 3 can be deployed;

[0075] When the upper base 1 slides backward on the lower base 2, the upper base 1 rises along the inclined surface, and the limiting rod 34 rises accordingly;

[0076] The front thread of the bracket 22 on the threaded rod 5 is opposite to the rear thread of the bracket 22, so that when the threaded rod 5 rotates forward to drive the upper base 1 to slide backward on the lower base 2, the top expansion mechanism 4 slides forward on the lower base 2;

[0077] When the side expansion mechanism 3 is in a folded state, the second expansion rods 32 on the two side expansion mechanisms 3 can clamp and fix the fan-shaped expansion component 43 in the arc-shaped frame 41 to realize the folding of the top expansion mechanism 4, and when the side expansion mechanism 3 is in an unfolded state, the second expansion rods 32 on the two side expansion mechanisms 3 are away from each other, leaving space for the fan-shaped expansion component 43 to unfold, and the torsion spring 44 can bounce the fan-shaped expansion component 43 open, so that the fan-shaped expansion component 43 can be unfolded;

[0078] That is, when the upper base 1 and the lower base 2 are in the unfolded state, the side expansion mechanism 3 is in the unfolded state, the top expansion mechanism 4 is displaced forward, and the top expansion mechanism 4 is in the unfolded state;

[0079] When the upper base 1 and the lower base 2 are in the folded state, the side expansion mechanism 3 is in the folded state, the top expansion mechanism 4 is displaced backward and reset, and the top expansion mechanism 4 is also in the folded state. At this time, the vertical plate 12 is completely received in the vertical rail 121, the limit rod 34 is completely received in the sleeve 33, the first expansion frame 311 is inserted into the second expansion frame 321, and the fan-shaped expansion component 43 is clamped and fixed in the arc frame 41, which effectively reduces the space occupied by the intervertebral fusion device and facilitates the implantation of the intervertebral fusion device through a small incision;

[0080] The number of expansion rods can also be increased according to actual usage conditions to increase the expansion area, further increase the cross-sectional area of ​​the fusion device, increase the contact area between the fusion device and the vertebrae, and effectively ensure the stability of the fusion device support.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A minimally invasive spinal endoscopic repositioning fusion device, comprising an upper base (1) and a lower base (2), characterized in that: The upper base (1) is slidably connected above the lower base (2); an upper inclined plate (13) is provided at the bottom of the upper base (1); a lower inclined plate (24) is provided at the top of the lower base (2); the inclined surface of the upper inclined plate (13) is in contact with the inclined surface of the lower inclined plate (24); the two sides of the lower base (2) are symmetrically rotatably connected to the side expansion mechanism (3); the front side of the lower base (2) is slidably connected to the top expansion mechanism (4); the lower base (2) is rotatably connected to a threaded rod (5); the upper base (1) is threadedly connected to the threaded rod (5); the threaded rod (5) is rotated to drive the upper base (1) to slide above the lower base (2); The upper base (1) slides above the lower base (2) to drive the side expansion mechanism (3) to fold or unfold; The side expansion mechanism (3) is composed of two groups symmetrically arranged on both sides of the lower base (2), and the side expansion mechanism (3) comprises a first expansion rod (31) and a second expansion rod (32). The rear ends of both sides of the lower base (2) are fixedly connected to a rotating column (21), and the rear ends of the first expansion rod (31) and the second expansion rod (32) are rotatably connected to the rotating column (21); A sleeve (33) is fixedly arranged between the first expansion rod (31) and the second expansion rod (32), a limit rod (34) is slidably connected inside the sleeve (33), limit plates (11) are symmetrically fixedly arranged on both sides of the upper base (1), a limit slot (111) is arranged on the limit plate (11), the top of the limit rod (34) is slidably connected to the limit slot (111), the limit slot (111) is an inclined slot, and the limit slot (111) matched with the first expansion rod (31) and the limit slot (111) matched with the second expansion rod (32) have different inclination angles.

2. The minimally invasive spinal fusion device according to claim 1, characterized in that: A vertical rail (121) is fixedly provided at the front end of the upper base (1), a vertical plate (12) is slidably connected to the vertical rail (121), the threaded rod (5) passes through the vertical plate (12), and the vertical plate (12) is threadedly connected to the threaded rod (5).

3. The minimally invasive spinal fusion device according to claim 2, characterized in that: A first expansion frame (311) is fixedly provided on one side of the front end of the first expansion rod (31), and a second expansion frame (321) is fixedly provided on one side of the front end of the second expansion rod (32); the first expansion frame (311) can be inserted into the second expansion frame (321).

4. The minimally invasive spinal fusion device according to claim 2, characterized in that: The upper base (1) slides above the lower base (2) to drive the top expansion mechanism (4) to slide horizontally. The top expansion mechanism (4) comprises an arc frame (41), a driving plate (42), a fan-shaped expansion component (43) and a torsion spring (44). The driving plate (42) is fixedly connected to the middle of the rear end of the arc frame (41). Vertical poles (411) are symmetrically fixedly arranged on both sides of the arc frame (41). The fan-shaped expansion components (43) are symmetrically arranged in two groups on both sides of the arc frame (41). The fan-shaped expansion components (43) are rotatably connected to the vertical poles (411). The torsion spring (44) is fixedly arranged at the connection between the fan-shaped expansion component (43) and the vertical pole (411). A dovetail groove (412) is provided at the bottom of the arc-shaped frame (41), a guide rail (23) is fixedly provided at the front end of the lower base (2), and the dovetail groove (412) can slide horizontally on the guide rail (23); The lower base (2) is fixedly connected to a bracket (22); the threaded rod (5) passes through the bracket (22) and the rear side wall of the lower base (2); the threaded rod (5) is rotatably connected to the bracket (22); the front end of the threaded rod (5) passes through a drive plate (42); the drive plate (42) is threadedly connected to the front end of the threaded rod (5); the drive plate (42) is arranged on the front side of the bracket (22); the vertical plate (12) is arranged on the rear side of the bracket (22); and the thread on the front side of the bracket (22) on the threaded rod (5) is opposite to the thread on the rear side of the bracket (22).

5. The minimally invasive spinal fusion device according to claim 1, characterized in that: The rear end of the threaded rod (5) is provided with an adjustment groove (51), and the adjustment groove (51) is arranged outside the rear side wall of the lower base (2).

Images