Minimally invasive spine intervertebral fusion cage and rigid fixing device thereof

Abstract

The invention discloses a spine minimally invasive intervertebral fusion cage and a rigid fixing device thereof, and belongs to the technical field of medical implantation instruments.The spine minimally invasive intervertebral fusion cage comprises a fusion cage body implanted between an upper lumbar vertebra body and a lower lumbar vertebra body, and the two sides of the center of the fusion cage body are each provided with a height adjusting assembly in a sliding mode; jacking springs are installed between the two height adjusting assemblies and the bottom cover plate, and spring pins used for fixing and releasing the height adjusting assemblies are inserted between the fusion cage body and the two height adjusting assemblies. And an upper top plate is fixedly mounted at the tops of the two height adjusting assemblies. By designing the fusion cage capable of automatically adjusting the height, when the fusion cage is used, the lifting seat and the upper top plate can be driven to abut against the lumbar vertebra body above by utilizing the bounce of the jacking spring, and after the fusion cage is adjusted in place, the lifting seat and the upper top plate can abut against the corresponding clamping teeth through the outer flanging sides of the two spring steel sheets, so that the supporting height of the lifting seat is fixed.

Description

Technical Field

[0001] The invention belongs to the technical field of medical implant devices, and in particular relates to a minimally invasive spinal interlaminar fusion device and a rigid fixing device thereof. Background Art

[0002] The minimally invasive spinal interlaminar fusion device is a medical device used in spinal surgery, mainly used to treat spinal diseases such as herniated disc, spinal instability or spinal stenosis. The interlaminar fusion device is usually made of biocompatible materials (such as titanium alloy, PEEK, etc.) to provide stability between vertebrae, promote bone healing and fusion, and it can also help connect adjacent vertebrae, relieve pain, and restore spinal function. Compared with traditional open surgery, minimally invasive surgery is performed through smaller incisions, reducing damage to surrounding tissues, reducing postoperative recovery time and the risk of complications.

[0003] Interlaminar fusion device is a very common medical implant device. There are many different types and specifications of interlaminar fusion devices on the market. Since the intervertebral height of each patient is different, in the actual treatment process, when the doctor removes the intervertebral disc, it is generally necessary to select interlaminar fusion devices of different heights according to actual needs. However, since most of the interlaminar fusion devices are fixed structure designs, they are often unable to be adjusted, which makes it easy for the size of the fusion device to be too large or too small. Fusion devices with too large sizes are more difficult to implant, while fusion devices with too small sizes are prone to slippage and displacement. Therefore, in actual use, doctors generally need to adjust the size of the fusion device. It takes a certain amount of time to make continuous adjustments. There are some fusion devices with adjustable support heights on the market, but most of them use threaded adjustment. During minimally invasive spinal surgery, due to the small surgical incision, the operation is relatively difficult during the actual adjustment process, which causes many inconveniences. In addition, after the fusion device is implanted, it is necessary to use corresponding fixing devices to fix the upper and lower lumbar vertebrae. Since the human lumbar spine has a certain curvature, the currently available fixing devices are all integrated fixing structures. During the operation, they cannot be freely adjusted according to the patient's body shape and the curvature of the lumbar spine, which will affect the actual surgical effect and postoperative rehabilitation to a certain extent. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a minimally invasive spinal interlaminar fusion device and a rigid fixation device thereof.

[0005] The technical solution adopted to solve the above technical problems is: a minimally invasive spinal interlaminar fusion device, comprising a fusion device body implanted between the upper and lower lumbar vertebrae, and a set of height adjustment components are slidably installed on both sides of the center of the fusion device body to adapt to the interlaminar height of different patients; A detachable bottom cover is fixedly installed at the bottom of the fusion device body, and lifting springs are installed between the two groups of height adjustment components and the bottom cover. Spring pins for fixing and releasing the height adjustment components are inserted between the fusion device body and the two groups of height adjustment components. An upper top plate is fixedly installed on the top of the two groups of height adjustment components.

[0006] Furthermore, the fusion device body includes a main support body, and penetrating mounting holes are provided on both sides of the center of the main support body, and limiting slide grooves are provided on both sides of the inner walls of the two mounting holes, and the two groups of limiting slide grooves do not penetrate the top of the main support body, and a bottom card slot for installing a bottom cover plate is provided at the bottom of the main support body, and rectangular grooves are provided at the front and rear ends of the inner walls of the mounting holes, and positioning tooth grooves are provided in the rectangular grooves, and inner grooves are provided in the middle of the front and rear ends of the main support body, and two symmetrically distributed positioning pin holes are provided in the inner groove at the front end for the two ends of the spring pin to be inserted, and clamping grooves are provided on both sides of the front and rear ends of the main support body.

[0007] Through the above technical solution, the fusion device body serves as the main supporting structure. During the surgical treatment, the doctor will use special medical forceps to clamp the clamping groove on the main supporting body, and then slowly insert it between the upper and lower lumbar vertebrae. After adjusting to the appropriate position, another set of auxiliary forceps can be used to clamp the spring pin and slowly pull it outward to separate the two ends of the spring pin from the two sets of height adjustment components. The spring pin can be left in the fusion device body or completely removed.

[0008] Furthermore, the height adjustment assembly includes a lifting seat slidably installed in the mounting hole, a spring positioning groove is provided at the center of the bottom of the lifting seat, the bottoms of both sides of the outer wall of the lifting seat are fixedly connected to limiting protrusions, the bottoms of the front and rear ends of the lifting seat are provided with mounting slots, spring steel sheets are fixedly installed in the two mounting slots, and a positioning slot corresponding to the positioning pin hole is provided on one side of the front end of the mounting slot.

[0009] Through the above technical scheme, the height adjustment component is a key component for adjusting the support height of the fusion device. During production and assembly, the lifting seat will be inserted from the bottom of the mounting hole, and the limiting protrusion will be slid and limited in the corresponding limiting slide groove. When the positioning pin hole is aligned with the positioning slot, the end of the spring pin can be inserted from the positioning pin hole and extended into the positioning slot, thereby realizing the positioning and fixation of the height adjustment component, and then the lifting spring is installed in the corresponding spring positioning slot, and finally the bottom of the fusion device body is fixed with the bottom cover plate. In the initial state, the lifting spring located between the height adjustment component and the bottom cover plate is in a compressed state; in the actual operation process, when the fusion device body is implanted in the designated position, a special auxiliary pliers can be used to clamp the spring pin and slowly pull it outward so that the two ends of the spring pin are aligned with the corresponding The two sets of height adjustment components are disengaged. At this time, since the lifting seat loses the restriction of the spring pin, the lifting seat and the upper top plate will be driven to rise instantly under the rebound force of the jacking spring until the top surface of the upper top plate is tightly pressed against the upper lumbar vertebra. In this process, the two spring steel sheets located at the front and rear ends of the lifting seat will also rise synchronously with it. During the rising process, the bent portion on the outside of the spring steel sheet will move upward along the positioning tooth groove. The positioning tooth groove is provided with a plurality of densely and evenly distributed latching teeth. After rising into place, the outer flange side of the spring steel sheet will be tightly pressed against the corresponding latching teeth to fix the support height of the lifting seat and prevent it from falling back. Since the latching teeth are very dense, the height adjustment can be better achieved to adapt to the intervertebral height of different patients. Finally, the spring pin can be left in the fusion device body or completely removed.

[0010] Furthermore, the bottom cover plate includes a cover plate body fixed in the bottom slot, and annular protrusions are provided on both sides of the top of the cover plate body.

[0011] Through the above technical solution, the bottom cover plate is used to seal the bottom of the fusion device body, and because annular protrusions are provided on both sides of the top of the cover plate body, the two lifting springs can be supported and positioned to ensure the stability of the lifting springs during compression and rebound release, and prevent positional displacement.

[0012] Furthermore, the upper top plate includes a top plate body fixed to the tops of the two sets of height adjustment components, and a plurality of evenly distributed anti-slip protrusions are provided on the top of the top plate body.

[0013] Through the above technical solution, the upper top plate can be fixed to the two sets of height adjustment components to form an integral structure. When the two sets of height adjustment components pop up, the top surface of the top plate body can be driven to press against the lumbar vertebrae. In addition, since an anti-slip protrusion is provided on the top of the top plate body, when the top plate body contacts the lumbar vertebrae, the position of the fusion device can be fixed to prevent the fusion device from being displaced, thereby ensuring the stability and reliability of the fusion device after implantation.

[0014] Furthermore, the bottom cover plate and the fusion device body, and the upper top plate and the two sets of height adjustment components are fixed by fixing screws.

[0015] Through the above technical solution, stable connection and fixation can be achieved, and assembly is also convenient.

[0016] A minimally invasive spinal interlaminar rigid fixation device matched with a fusion device comprises a lumbar vertebrae fixation structure, wherein the lumbar vertebrae fixation structure comprises lamina screws threadedly connected to upper and lower lumbar vertebrae, and a connecting portion is installed between two lamina screws.

[0017] Through the above technical scheme, the lumbar fixation structure is mainly used for auxiliary fixation between the upper and lower lumbar vertebrae. Compared with the traditional fixed structure, the connection part installed between the two lamina screws in this scheme adopts a movable structure design, and the two can slide relative to each other, thereby realizing a small range of adaptive position adjustment. During the operation, it can be freely adjusted according to the patient's body shape and lumbar curvature. After adjusting to the appropriate position, it can be directly locked by the corresponding screws.

[0018] Furthermore, the lamina nail comprises a ball stud threadedly connected to the lumbar vertebral body, a mounting seat is movably mounted at the front end of the ball stud, a mounting slot is provided at the front end of the mounting seat, and a threaded locking seat for fixing the connection part is threadedly connected to the mounting seat.

[0019] Through the above technical solution, the lamina nail will be driven into the cone plate of the patient's lumbar vertebra by threaded engagement during the operation. Since the ball head nail and the mounting seat are movably connected, the mounting seat can be freely adjusted to a certain angle to facilitate the rapid installation of the connection part.

[0020] Furthermore, the connecting part is structure one, which includes an upper connecting body and a lower connecting body respectively installed in two mounting grooves, and the upper connecting body and the lower connecting body are fixedly connected to one end of the mounting seat close to the first limiting column, and a limiting connecting block is sleeved on the lower connecting body, and two limiting holes are provided on the limiting connecting block. One end of the upper connecting body slides in one of the limiting holes, and the limiting connecting block and the lower connecting body, as well as the limiting connecting block and the upper connecting body are fixed by a first locking screw.

[0021] Through the above technical solution, by installing a limiting connecting block between the upper connecting body and the lower connecting body, a certain sliding displacement can be achieved between the upper connecting body and the lower connecting body, and it can be locked and fixed by the first locking screw. During the operation, it can be freely adjusted according to the patient's body shape and lumbar curvature, so that the upper and lower lumbar vertebrae can be adaptively adjusted and quickly fixed through the lamina nails and the connecting part.

[0022] Furthermore, the connecting part is structure two, and the structure two includes an upper connecting rod and a lower connecting sleeve respectively installed on the upper and lower mounting seats, and the upper connecting rod and the lower connecting sleeve are fixedly connected with a second limiting column at one end close to the mounting seat, and the upper connecting rod and the lower connecting sleeve are mutually socketed, and the upper connecting rod and the lower connecting sleeve are fixed by a second locking screw.

[0023] Through the above technical solution, the upper connecting rod and the lower connecting sleeve are slidably connected by using a sleeve connection, which can achieve the same sliding effect. During the operation, it can be freely adjusted according to the patient's body shape and lumbar curvature. After adjusting to the appropriate position, it can be locked and fixed by the second locking screw.

[0024] The beneficial effects of the present invention are as follows: (1) The present invention designs a fusion device that can automatically adjust the height. When in use, the rebound force of the lifting spring can be used to drive the lifting seat and the upper top plate to press against the upper lumbar vertebra. After adjustment, the outer turned sides of the two spring steel sheets can be pressed against the corresponding latch teeth to fix the support height of the lifting seat and prevent it from falling back. Since the latch teeth are very dense, the height adjustment can be better achieved to adapt to the intervertebral height of different patients; (2) The present invention installs a movable connecting part between the two lamina screws, so that the two can slide relative to each other. During the operation, it can be freely adjusted according to the patient's body shape and lumbar curvature, so that the upper and lower lumbar vertebrae can be adaptively adjusted and quickly fixed through the lamina screws and the connecting part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a diagram showing the combined use state of the fusion device and the lumbar fixation structure of the present invention; Figure 2 This is a structural diagram of the fusion device of the present invention from a first perspective; Figure 3 is a structural diagram of the fusion device of the present invention from a second viewing angle; Figure 4 is an exploded view of the fusion device of the present invention; Figure 5 is a front view of the fusion device of the present invention; Figure 6 yes Figure 5 AA-direction stereoscopic cross-sectional view; Figure 7 yes Figure 6 A partial enlarged view of the middle A; Figure 8 is a right side view of the fusion device of the present invention; Fig. 9 yes Figure 8 Middle BB section view; Fig.10It is a schematic diagram of the installation structure of the height adjustment component of the present invention; Fig.11 is a schematic structural diagram of a height adjustment assembly of the present invention; Fig.12 It is a schematic diagram of the main structure of the lumbar vertebra fixation structure of the present invention; Fig.13 is a schematic structural diagram of a lumbar vertebra fixation structure according to a first embodiment of the present invention; Fig.14 is a structural schematic diagram of a lumbar vertebrae fixation structure according to a second embodiment of the present invention; Fig.15 yes Fig.11 A partial enlarged view of point B in the middle.

[0026] Figure numerals: 1. Fusion device body; 101. Main support body; 102. Mounting hole; 103. Limiting slide groove; 104. Bottom card slot; 105. Rectangular slot; 106. Positioning tooth slot; 107. Inner groove; 108. Positioning pin hole; 109. Clamping slot; 2. Height adjustment assembly; 201. Lifting seat; 202. Spring positioning slot; 203. Limiting protrusion; 204. Mounting card slot; 205. Spring steel sheet; 206. Positioning slot; 3. Bottom cover plate; 301. Cover plate body; 302. Annular protrusion; 4. Lifting spring; 5. Spring pin; 6. Upper top plate ;601, top plate body; 602, anti-slip protrusion; 7, lumbar vertebrae fixation structure; 71, lamina nail; 711, ball head nail; 712, mounting seat; 713, mounting groove; 714, threaded locking seat; 72, connecting part; 7211, upper connecting body; 7212, lower connecting body; 7213, first limiting column; 7214, limiting connecting block; 7215, limiting hole; 7216, first locking screw; 7221, upper connecting rod; 7222, lower connecting sleeve; 7223, second limiting column; 7224, second locking screw; 8, lumbar vertebrae; 9, fixing screw. DETAILED DESCRIPTION

[0027] 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. Embodiment 1

[0028] like Figure 1-Figure 13As shown, a minimally invasive spinal interlaminar fusion device of the present embodiment includes a fusion device body 1 implanted between the upper and lower lumbar vertebrae 8, the fusion device body 1 includes a main support body 101, both sides of the center of the main support body 101 are provided with penetrating mounting holes 102, both sides of the inner walls of the two mounting holes 102 are provided with limiting slide grooves 103, and the two sets of limiting slide grooves 103 do not penetrate the top of the main support body 101, the bottom of the main support body 101 is provided with a bottom card groove 104 for installing the bottom cover plate 3, the front and rear ends of the inner walls of the mounting holes 102 are provided with rectangular grooves 105, and the rectangular grooves 105 are provided with positioning tooth grooves 106, and the middle parts of the front and rear ends of the main support body 101 are provided with inner grooves 107, two symmetrically distributed positioning pin holes 108 are provided in the inner groove 107 at the front end for the two ends of the spring pin 5 to be inserted, and clamping grooves 109 are provided on both sides of the front and rear ends of the main support body 101. The fusion device body 1 serves as the main support structure. During the surgical treatment, the doctor will use special medical forceps to clamp the clamping groove 109 on the main support body 101, and then slowly insert it between the upper and lower lumbar vertebrae 8. After adjusting to the appropriate position, another set of auxiliary forceps can be used to clamp the spring pin 5 and slowly pull it outward to disengage the two ends of the spring pin 5 from the two sets of height adjustment components 2. The spring pin 5 can be left in the fusion device body 1 or completely removed.

[0029] For height adjustment assembly 2, refer to Figure 4-Figure 11 and Fig.15 A set of height adjustment components 2 are slidably installed on both sides of the center of the fusion device body 1 to adapt to the intervertebral plate height of different patients; the height adjustment component 2 includes a lifting seat 201 slidably installed in the mounting hole 102, a spring positioning groove 202 is opened at the bottom center of the lifting seat 201, and the bottoms of both sides of the outer wall of the lifting seat 201 are fixedly connected with limited position protrusions 203, and the bottoms of the front and rear ends of the lifting seat 201 are opened with mounting slots 204, and spring steel sheets 205 are fixedly installed in the two mounting slots 204. A positioning slot 206 corresponding to the positioning pin hole 108 is opened on one side of the front end of the mounting slot 204. The height adjustment component 2 is a support for adjusting the fusion device. The key component of height, during production and assembly, the lifting seat 201 will be inserted from the bottom of the mounting hole 102, and the limiting protrusion 203 will be slid and limited in the corresponding limiting slide groove 103. When the positioning pin hole 108 is aligned with the positioning slot 206, the end of the spring pin 5 can be inserted from the positioning pin hole 108 and extended into the positioning slot 206, so as to realize the positioning and fixation of the height adjustment component 2, and then the lifting spring 4 is installed in the corresponding spring positioning slot 202, and finally the bottom cover plate 3 is used to fix the bottom of the fusion device body 1. In the initial state, the lifting spring 4 located between the height adjustment component 2 and the bottom cover plate 3 is in a compressed state.

[0030] Furthermore, in the actual operation of this embodiment, after the fusion device body 1 is implanted in the designated position, the spring pin 5 can be clamped with a dedicated auxiliary forceps and slowly pulled outward to separate the two ends of the spring pin 5 from the corresponding two sets of height adjustment components 2. At this time, since the lifting seat 201 loses the restriction of the spring pin 5, the lifting seat 201 and the upper top plate 6 will be driven to rise instantly under the rebound force of the lifting spring 4 until the top surface of the upper top plate 6 is tightly pressed against the upper lumbar vertebra 8. In this process, the two spring steel sheets 205 located at the front and rear ends of the lifting seat 201 It will also rise synchronously with it. During the rising process, the bent portion on the outside of the spring steel sheet 205 will move upward along the positioning tooth groove 106. The positioning tooth groove 106 is provided with a plurality of densely and evenly distributed latching teeth. After rising to the right position, the outer flange side of the spring steel sheet 205 will be tightly pressed against the corresponding latching teeth to fix the support height of the lifting seat 201 and prevent it from falling back. Since the latching teeth are very dense, the height adjustment can be better achieved to adapt to the intervertebral height of different patients. Finally, the spring pin 5 can be left in the fusion device body 1 or completely removed.

[0031] refer to Figure 4 A detachable bottom cover plate 3 is fixedly installed at the bottom of the fusion device body 1, and lifting springs 4 are installed between the two sets of height adjustment components 2 and the bottom cover plate 3. A spring pin 5 for fixing and releasing the height adjustment components 2 is inserted between the fusion device body 1 and the two sets of height adjustment components 2.

[0032] For bottom cover 3, refer to Figure 4 , Figure 5 and Fig. 9 The bottom cover plate 3 includes a cover plate body 301 fixed in the bottom slot 104, and annular protrusions 302 are provided on both sides of the top of the cover plate body 301. The bottom cover plate 3 is used to seal the bottom of the fusion device body 1, and because annular protrusions 302 are provided on both sides of the top of the cover plate body 301, the two lifting springs 4 can be supported and positioned to ensure the stability of the lifting springs 4 during compression and rebound release, and no position displacement occurs.

[0033] Regarding the upper top plate 6, refer to Figure 2-Figure 11 An upper top plate 6 is fixedly installed on the top of the two groups of height adjustment components 2. The upper top plate 6 includes a top plate body 601 fixed on the top of the two groups of height adjustment components 2. A plurality of evenly distributed anti-slip protrusions 602 are arranged on the top of the top plate body 601. The upper top plate 6 can be fixed to the two groups of height adjustment components 2 to form an integral structure. When the two groups of height adjustment components 2 are popped up, the top surface of the top plate body 601 can be driven to press against the lumbar vertebral body 8. Moreover, since the top of the top plate body 601 is provided with an anti-slip protrusion 602, when the top plate body 601 contacts the lumbar vertebral body 8, the position of the fusion device can be fixed to prevent the fusion device from being displaced, thereby ensuring the stability and reliability of the fusion device after implantation.

[0034] Furthermore, in this embodiment, the bottom cover plate 3 and the fusion device body 1, and the upper top plate 6 and the two sets of height adjustment components 2 are fixed by fixing screws 9, which can not only achieve stable connection and fixation, but also facilitate assembly.

[0035] A minimally invasive spinal interlaminar rigid fixation device matched with a fusion device, comprising a lumbar fixation structure 7, reference Figure 1 , Fig.12 and Fig.13 The lumbar vertebrae fixing structure 7 includes lamina screws 71 threadedly connected to the upper and lower lumbar vertebrae 8, and a connecting portion 72 is installed between the two lamina screws 71. The lumbar vertebrae fixing structure 7 is mainly used for auxiliary fixation between the upper and lower lumbar vertebrae 8. Compared with the traditional fixed structure, the connecting portion 72 installed between the two lamina screws 71 in this solution adopts a movable structure design, and the two can slide relative to each other, thereby realizing a small range of adaptive position adjustment. During the operation, it can be freely adjusted according to the patient's body shape and lumbar curvature. After adjusting to the appropriate position, it can be directly locked by the corresponding screws.

[0036] This embodiment further refers to Figure 12-13 The lamina nail 71 includes a ball nail 711 threadedly connected to the lumbar vertebral body 8, a mounting seat 712 is movably installed at the front end of the ball nail 711, a mounting groove 713 is provided at the front end of the mounting seat 712, and a threaded locking seat 714 for fixing the connecting part 72 is internally threadedly connected to the mounting seat 712. During the operation, the lamina nail 71 will be driven into the cone plate of the patient's lumbar vertebral body 8 by threaded engagement. Since the ball nail 711 and the mounting seat 712 are movably connected, the mounting seat 712 can be freely adjusted at a certain angle to facilitate the rapid installation of the connecting part 72.

[0037] This embodiment provides one structure of the connecting portion 72, specifically structure 1, refer to Figure 12-13The structure 1 includes an upper connecting body 7211 and a lower connecting body 7212 respectively installed in two installation grooves 713. One end of the upper connecting body 7211 and the lower connecting body 7212 close to the installation seat 712 is fixedly connected with a first limiting column 7213. A limiting connecting block 7214 is sleeved on the lower connecting body 7212. The limiting connecting block 7214 has two limiting holes 7215. One end of the upper connecting body 7211 slides in one of the limiting holes 7215. The limiting connecting block 7214 and the lower connecting body 7212 are spaced apart from each other. 214 and the upper connecting body 7211 are fixed by the first locking screw 7216. By installing the limiting connecting block 7214 between the upper connecting body 7211 and the lower connecting body 7212, a certain sliding displacement can be achieved between the upper connecting body 7211 and the lower connecting body 7212, and it can be locked and fixed by the first locking screw 7216. During the operation, it can be freely adjusted according to the patient's body shape and lumbar curvature, so that the upper and lower lumbar vertebrae 8 can be adaptively adjusted and quickly fixed through the lamina nails 71 and the connecting part 72. Embodiment 2

[0038] refer to Fig.14 The difference between this embodiment and the first embodiment is that the connecting portion 72 can also be designed to be in the shape of structure 2. Structure 2 includes an upper connecting rod 7221 and a lower connecting sleeve 7222 respectively mounted on the upper and lower mounting seats 712. The upper connecting rod 7221 and the lower connecting sleeve 7222 are fixedly connected with a second limiting column 7223 at one end close to the mounting seat 712, and the upper connecting rod 7221 and the lower connecting sleeve 7222 are mutually sleeved. The upper connecting rod 7221 and the lower connecting sleeve 7222 are fixed by a second locking screw 7224. By adopting a sleeve connection to slide the upper connecting rod 7221 and the lower connecting sleeve 7222, the same sliding effect can be achieved. During the operation, it can be freely adjusted according to the patient's body shape and lumbar curvature. After adjusting to the appropriate position, it can be locked and fixed by the second locking screw 7224.

[0039] The working principle is as follows. After the doctor places the fusion device body 1 between the upper and lower lumbar vertebrae 8 and adjusts it to a suitable position, he can use another set of auxiliary pliers to clamp the spring pin 5 and slowly pull it outward to disengage the two ends of the spring pin 5 from the two sets of height adjustment components 2. At this time, since the lifting seat 201 loses the restriction of the spring pin 5, the lifting seat 201 and the upper top plate 6 will be driven to rise instantly under the rebound force of the lifting spring 4, until the top surface of the upper top plate 6 is tightly against the upper lumbar vertebra 8. In this process, the two spring steel sheets 205 located at the front and rear ends of the lifting seat 201 will also rise synchronously with it, and the bent portion on the outside of the spring steel sheet 205 will move upward along the positioning tooth groove 106. After rising to the right position, the outer turning side of the spring steel sheet 205 will be tightly against the corresponding latch tooth. At this time, the fixing of the support height of the lifting seat 201 is completed, and the fusion device is implanted. Then, filling materials such as autologous bone or artificial bone can be filled into the intervertebral disc from the wound position; After the fusion device is implanted, the lumbar fixation structure 7 needs to be fixed between the upper and lower lumbar vertebrae 8. During the operation, the lamina screws 71 will first be drilled obliquely (to prevent damage to the spinal nerves), and then fixed in the cone plate of the patient's lumbar vertebrae 8 by screwing. Then, the connecting part 72 is installed between the two lamina screws 71. Since the connecting part 72 installed between the two lamina screws 71 adopts a movable structural design, the two can slide relative to each other, thereby achieving a small range of adaptive position adjustment. During the operation, it can be freely adjusted according to the patient's body shape and lumbar curvature, so that the upper and lower lumbar vertebrae 8 can be adaptively adjusted and quickly fixed through the lamina screws 71 and the connecting part 72.

[0040] 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 interlaminar fusion device, comprising a fusion device body (1) implanted between two upper and lower lumbar vertebrae (8), characterized in that: A set of height adjustment components (2) are slidably mounted on both sides of the center of the fusion device body (1) to adapt to the intervertebral plate height of different patients; A detachable bottom cover plate (3) is fixedly mounted on the bottom of the fusion device body (1); lifting springs (4) are mounted between the two sets of height adjustment components (2) and the bottom cover plate (3); and spring pins (5) for fixing and releasing the height adjustment components (2) are inserted between the fusion device body (1) and the two sets of height adjustment components (2); An upper top plate (6) is fixedly mounted on the top of the two groups of height adjustment components (2).

2. The minimally invasive spinal interlaminar fusion device according to claim 1, characterized in that: The fusion device body (1) comprises a main support body (101), both sides of the center of the main support body (101) are provided with penetrating mounting holes (102), both sides of the inner walls of the two mounting holes (102) are provided with limiting sliding grooves (103), and the two groups of limiting sliding grooves (103) do not penetrate the top of the main support body (101), the bottom of the main support body (101) is provided with a bottom clamping groove (104) for installing a bottom cover plate (3), the front and rear ends of the inner walls of the mounting holes (102) are provided with rectangular grooves (105), and the rectangular grooves (105) are provided with positioning tooth grooves (106), the middle parts of the front and rear ends of the main support body (101) are provided with inner grooves (107), and the inner grooves (107) located at the front end are provided with two symmetrically distributed positioning pin holes (108) for the two ends of the spring pin (5) to be inserted, and the front and rear ends of the main support body (101) are provided with clamping grooves (109) on both sides.

3. The minimally invasive spinal interlaminar fusion device according to claim 2, characterized in that: The height adjustment assembly (2) comprises a lifting seat (201) slidably mounted in the mounting hole (102); a spring positioning groove (202) is provided at the center of the bottom of the lifting seat (201); the bottoms of both sides of the outer wall of the lifting seat (201) are fixedly connected to limiting protrusions (203); the bottoms of the front and rear ends of the lifting seat (201) are provided with mounting slots (204); spring steel sheets (205) are fixedly mounted in the two mounting slots (204); and a positioning slot (206) corresponding to the positioning pin hole (108) is provided on one side of the front end of the mounting slot (204).

4. The minimally invasive spinal interlaminar fusion device according to claim 3, characterized in that: The bottom cover plate (3) comprises a cover plate body (301) fixed in a bottom slot (104), and annular protrusions (302) are provided on both sides of the top of the cover plate body (301).

5. The minimally invasive spinal interlaminar fusion cage according to claim 1, characterized in that: The upper top plate (6) comprises a top plate body (601) fixed to the tops of the two sets of height adjustment components (2), and a plurality of evenly distributed anti-slip protrusions (602) are provided on the top of the top plate body (601).

6. The minimally invasive spinal interlaminar fusion cage according to claim 1, characterized in that: The bottom cover plate (3) and the fusion device body (1), as well as the upper top plate (6) and the two sets of height adjustment components (2) are fixed by fixing screws (9).

7. A minimally invasive spinal interlaminar rigid fixation device matched with the fusion device of claim 1, comprising a lumbar fixation structure (7), characterized in that: The lumbar vertebrae fixing structure (7) comprises lamina screws (71) threadedly connected to the upper and lower lumbar vertebrae (8), and a connecting portion (72) is installed between the two lamina screws (71).

8. The minimally invasive spinal interlaminar rigid fixation device according to claim 7, characterized in that: The lamina nail (71) comprises a ball nail (711) threadedly connected to the lumbar vertebral body (8), a mounting seat (712) being movably mounted at the front end of the ball nail (711), a mounting groove (713) being formed at the front end of the mounting seat (712), and a threaded locking seat (714) for fixing the connecting portion (72) being internally threadedly connected to the mounting seat (712).

9. The minimally invasive spinal interlaminar rigid fixation device according to claim 8, characterized in that: The connecting portion (72) is structure 1, and the structure 1 comprises an upper connecting body (7211) and a lower connecting body (7212) respectively installed in two installation grooves (713); one end of the upper connecting body (7211) and the lower connecting body (7212) close to the installation seat (712) are fixedly connected with a first limiting column (7213); a limiting connecting block (7214) is sleeved on the lower connecting body (7212); two limiting holes (7215) are provided on the limiting connecting block (7214); one end of the upper connecting body (7211) slides in one of the limiting holes (7215); the limiting connecting block (7214) and the lower connecting body (7212), and the limiting connecting block (7214) and the upper connecting body (7211) are fixed by a first locking screw (7216).

10. The minimally invasive spinal interlaminar rigid fixation device according to claim 8, characterized in that: The connecting portion (72) is structure 2, and the structure 2 comprises an upper connecting rod (7221) and a lower connecting sleeve (7222) respectively mounted on upper and lower mounting seats (712); one end of the upper connecting rod (7221) and the lower connecting sleeve (7222) close to the mounting seat (712) are fixedly connected to a second limiting column (7223), and the upper connecting rod (7221) and the lower connecting sleeve (7222) are sleeved with each other, and the upper connecting rod (7221) and the lower connecting sleeve (7222) are fixed by a second locking screw (7224).

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