Ithralgia fixing device

Abstract

The invention provides an isthmus fixing device, and belongs to the technical field of medical instruments. The spondylolysis fixing device comprises a pedicle screw, a vertebral plate hook and a bone fracture plate, a mounting screw seat is arranged at the tail of the pedicle screw, the vertebral plate hook comprises a rod part and a hook part, the hook part is arranged at the lower end of the rod part and faces a vertebral body, a fixing pointed cone is arranged on the side wall, close to the vertebral body, of the hook part, and the fixing pointed cone is connected with the bone fracture plate. The upper end of the rod portion penetrates through the installation screw seat, a locking hole is formed in the upper end of the bone fracture plate, and a pedicle screw penetrates through the locking hole to fix the bone fracture plate to the rear wall of the vertebral body. The spondylolysis fixing device is provided with the bone fracture plate, the bone fracture plate is fixed to the rear side wall of the vertebral body through the vertebral pedicle screw, the fixing pointed cone is arranged on the hook part of the vertebral plate hook, and the fixing stability of the device is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a spondylolysis fixation device. Background Art

[0002] Lumbar spondylolysis is a common spinal injury disorder in clinical practice. It is mainly caused by congenital reasons and traumatic stress, resulting in discontinuity and fracture of the lumbar isthmus. It usually shows damage and fracture of the isthmus vertebrae between the articular processes of the vertebral arch on one or both sides of the lumbar spine. Since the bone quality of the lumbar isthmus is thin in young people, the anti-shear force of the intervertebral disc is weak, and the lumbosacral muscles are not strong enough, especially high-intensity exercise is likely to cause stress fractures of the isthmus. Therefore, lumbar spondylolysis has a relatively high incidence in the youth period, especially in people engaged in intense exercise or excessive labor. When lumbar spondylolysis occurs, it will cause symptoms such as low back pain, hip and thigh pain, and nerve numbness, resulting in inconvenience for patients to move. If not treated in a timely and effective manner, corresponding segmental intervertebral disc degeneration, intervertebral disc herniation, and even vertebral slippage may occur, leading to dysfunctions in lower limb walking and urination and defecation. The treatment of lumbar spondylolysis can be conservative treatment or surgical treatment. Surgical treatment generally adopts direct repair of spondylolysis. The currently widely used direct repair of spondylolysis is isthmus bone graft fusion combined with single-segment internal fixation. It can solve the stress shielding effect of cross-segment internal fixation on adjacent segments. During the treatment process, a lamina hook-pedicle screw fixation system can be used. The hook screw connecting the pedicle screw at the base of the superior articular process and the lamina hook is used to treat spondylolysis. The fixation is firm, which is beneficial to isthmus bone graft fusion. After the operation, the patient can get out of bed early; single-segment fixation of the lumbar motion segment does not affect the lumbar segment movement, has little impact on adjacent segments, and at the same time has a large bone graft area and a high bone graft fusion rate, and the excellent rate of curative effect is high. When implanting a pedicle screw at the base of the superior articular process and hooking the lamina hook on the lower edge of the same-segment lamina, the two can be connected by a connecting bar, and pressure can be achieved by adjusting the screws on the connecting bar. However, the fit between the lamina hook and the lumbar lamina is poor, affecting the fixation effect. Summary of the Invention

[0003] The purpose of the present invention is to provide a spondylolysis fixation device, aiming to solve the problem of poor fit between the lamina hook-pedicle screw fixation system and the lumbar lamina.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: to provide a spondylolysis fixation device, including a pedicle screw, a lamina hook, and a bone plate. An installation nail seat is arranged at the tail of the pedicle screw. The lamina hook includes a rod portion and a hook portion. The hook portion is arranged at the lower end of the rod portion. The hook portion faces the vertebral body. A fixed sharp cone is arranged on the side wall of the hook portion close to the vertebral body. The upper end of the rod portion penetrates through the installation nail seat. A locking hole is arranged at the upper end of the bone plate. The pedicle screw passes through the locking hole to fix the bone plate on the posterior wall of the vertebral body.

[0005] In a possible implementation, the bone plate is disposed to fit the posterior wall of the vertebral body.

[0006] In a possible implementation, the bone plate is disposed to fit the posterior wall of the vertebral body.

[0007] In a possible implementation, the two groups of fixing holes are arranged along the length direction of the bone plate.

[0008] In a possible implementation, the fixing screw penetrates into the inferior articular process.

[0009] In a possible implementation, a universal ball head is provided at the rear end of the pedicle screw, the universal ball head is matched with the front end of the mounting screw seat, a limiting seat is arranged in the mounting screw seat, and the limiting seat is arranged at the rear side of the universal ball head to limit the universal ball head.

[0010] In a possible implementation, a relief groove adapted to receive the upper end of the rod portion is provided at the rear end of the limiting seat.

[0011] In a possible implementation, a locking seat is arranged in the mounting screw seat, the locking seat is arranged at the rear side of the lamina hook, and the upper end of the rod portion is limited in the mounting screw seat.

[0012] In a possible implementation, the locking seat is in threaded cooperation with the mounting screw seat.

[0013] In a possible implementation, the lower end of the bone plate is located above the lower end of the lamina hook.

[0014] The beneficial effect of a spondylolysis fixing device provided by the present invention lies in:

[0015] Compared with the prior art, a pedicle screw, a lamina hook and a bone plate are provided. The pedicle screw is used for implanting at the base of the superior articular process. The mounting screw seat is arranged at the tail of the pedicle screw. The lamina hook includes a rod portion and a hook portion which are sequentially connected. The rod portion of the lamina hook penetrates through the mounting screw seat and is limited in the mounting screw seat. The hook portion of the lamina hook extends downward and hooks on the lower edge of the same-segment lamina. Locking holes are provided at the upper end of the bone plate, and the pedicle screw passes through the locking holes to fix the bone plate. The bone plate is arranged on the posterior side wall of the vertebral body, which helps to strengthen the fixation of the device to the vertebral body and helps to improve the recovery rate of the patient. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the three-dimensional structure of the spondylolysis fixation device provided by the embodiment of the present invention Figure 1 ;

[0018] Figure 2 Schematic diagram of the three-dimensional structure of the spondylolysis fixation device provided by the embodiment of the present invention Figure 2 ;

[0019] Figure 3 Exploded structure schematic diagram of the spondylolysis fixation device provided by the embodiment of the present invention.

[0020] In the figure: 1, pedicle screw; 2, universal ball head; 3, bone plate; 4, fixing screw; 5, guiding inclined plane; 6, lamina hook; 7, rod part; 8, contraction part; 9, hook part; 10, fixing sharp cone; 11, mounting screw seat; 12, limiting seat; 13, locking seat; 14, rotating groove. Detailed implementation manners

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0023] Please refer to Figures 1 to 3 , and now a specific implementation manner of a spondylolysis fixation device provided by the present invention will be described. It includes a pedicle screw 1, a lamina hook 6, and a connecting plate 3. An installation socket 11 is provided at the tail of the pedicle screw 1. The lamina hook 6 includes a rod portion 7 and a hook portion 9. The hook portion 9 is provided at the lower end of the rod portion 7, and the hook portion 9 faces the vertebral body. A fixing pointed cone 10 is provided on the side wall of the hook portion 9 close to the vertebral body. The upper end of the rod portion 7 penetrates through the installation socket 11. A locking hole is provided at the upper end of the connecting plate 3. The pedicle screw 1 passes through the locking hole to fix the connecting plate 3 to the posterior wall of the vertebral body.

[0024] A spondylolysis fixation device provided by the present invention, compared with the prior art, is provided with a pedicle screw 1, a lamina hook 6, and a connecting plate 3. The pedicle screw 1 is used to be implanted at the base of the superior articular process. The installation socket 11 is provided at the tail of the pedicle screw 1. The lamina hook 6 includes a rod portion 7 and a hook portion 9 that are sequentially connected. The rod portion 7 of the lamina hook 6 penetrates through the installation socket 11 and is limited within the installation socket 11. The hook portion 9 of the lamina hook 6 extends downward and hooks on the lower edge of the lamina of the same segment. A locking hole is provided at the upper end of the connecting plate 3. The pedicle screw 1 passes through the locking hole to fix the connecting plate 3, and the connecting plate 3 is provided on the posterior side wall of the vertebral body, which helps to strengthen the fixation of the device to the vertebral body and helps to improve the recovery rate of the patient.

[0025] Specifically, please refer to Figures 1 to 3, define the side of the vertebra with the superior articular process as the posterior side wall of the vertebra, and the side of the vertebra away from the superior articular process as the anterior side wall of the vertebra. Define the front-back direction of the device in the front-back direction of the vertebra. The isthmic fracture fixation device includes a pedicle screw 1, a laminar hook 6, and a bone plate 3. The mounting socket 11 is arranged at the tail of the pedicle screw 1. The tail of the pedicle screw 1 is located within the mounting socket 11, and the tail of the pedicle screw 1 is located at the front end of the mounting socket 11. The front side wall of the mounting socket 11 is suitable for the nail body of the pedicle screw 1 to penetrate. The nail body of the pedicle screw 1 is provided with threads. The diameter of the tail of the pedicle screw 1 is greater than the diameter of the nail body of the pedicle screw 1, preventing the pedicle screw 1 from detaching from the mounting socket 11 during use and increasing the stability of the device during use. The bone plate 3 is located on the front side of the mounting socket 11. The upper end of the bone plate 3 is provided with a locking hole. The nail body of the pedicle screw 1 passes through the locking hole at the upper end of the bone plate 3 and is implanted into the base of the superior articular process. The mounting socket 11 helps to limit the bone plate 3 on the posterior side wall of the vertebra. The laminar hook 6 includes a rod portion 7 and a hook portion 9 connected up and down. A contraction portion 8 is arranged between the rod portion 7 and the hook portion 9. The rod portion 7 is located at the upper end of the contraction portion 8, and the hook portion 9 is located at the lower end of the contraction portion 8. The diameter of the contraction portion 8 gradually decreases as it approaches the hook portion 9. The upper end of the rod portion 7 of the laminar hook 6 is inserted into the mounting socket 11. The upper end of the rod portion 7 of the laminar hook 6 penetrates through the side wall of the mounting socket 11. The rod portion 7 of the laminar hook 6 is located on the posterior side away from the vertebral body at the tail of the pedicle screw 1. The laminar hook 6 is located on the posterior side of the bone plate 3. The hook portion 9 of the laminar hook 6 faces the vertebral body and hooks on the lower edge of the same-segment lamina. The hook portion 9 of the laminar hook 6 has a curvature matching the lower edge of the vertebra. Two groups of fixing sharp cones 10 are arranged on the side wall of the hook portion 9 close to the vertebra. The two groups of fixing sharp cones 10 are arranged along the width direction of the hook portion 9. The fixing sharp cones 10 are conical. The fixing sharp cones 10 can be nailed into the vertebral body, helping to fix the hook portion 9 on the vertebral body and preventing the laminar hook 6 from falling off. The bone plate 3 cooperates with the laminar hook 6 to improve the stability of the device fixation and help the patient recover.

[0026] As a specific implementation manner of an isthmic fracture fixation device provided by the present invention, please refer to Figures 1 to 3 , the bone plate 3 is arranged in close contact with the posterior wall of the vertebral body.

[0027] Specifically, please refer to Figures 1 to 3 , the anterior side wall of the bone plate 3 is in close contact with the posterior wall of the vertebral body. The shape of the bone plate 3 conforms to the physiological curve of the vertebral body. The bone plate 3 extends along the direction of the laminar hook 6. The edge of the bone plate 3 is a curve. In order to match the physiological curve of the vertebral body, the middle part of the bone plate 3 is recessed forward relative to the upper and lower ends. The width of the widest part at the lower end of the bone plate 3 is greater than the width of the widest part at the upper end of the bone plate 3, improving the adhesion of the bone plate 3 to the posterior side wall of the vertebral body and increasing the stability of fixation.

[0028] As a specific embodiment of the isthmic spondylolisthesis fixation device provided by the present invention, please refer to Figures 1 to 3 A fixing hole is provided on the bone plate 3, and a fixing nail 4 is inserted through the fixing hole.

[0029] Specifically, please refer to Figures 1 to 3 A fixing nail 4 is provided on the bone plate 3. The fixing nail 4 passes through the fixing hole provided on the bone plate 3 and penetrates into the patient's vertebral body. The fixing hole is provided at the lower end of the bone plate 3, and the fixing nail 4 is located below the pedicle screw 1, which helps to enhance the stability of vertebral body fixation. A holding groove is provided at the tail of the fixing nail 4. The holding groove is provided at the center of the tail of the fixing nail 4 and is suitable for the insertion of tools, which helps to hold the fixing nail 4 and implant the fixing nail 4 into the patient's vertebral body. The fixing nail 4 includes a tail and a nail part which are connected. The tail of the fixing nail 4 is provided at the rear end of the nail part of the fixing nail 4. A guiding inclined surface 5 is provided on the outer side wall of the tail of the fixing nail 4. The guiding inclined surface 5 surrounds the tail of the fixing nail 4. Under the action of the guiding inclined surface 5, the diameter of the tail of the fixing nail 4 gradually decreases as it gets closer to the nail part of the fixing nail 4, which is convenient for the implantation of the fixing nail 4.

[0030] As a specific embodiment of the isthmic spondylolisthesis fixation device provided by the present invention, please refer to Figures 1 to 3 Two groups of fixing holes are arranged along the length direction of the bone plate 3.

[0031] Specifically, please refer to Figures 1 to 3 There are two groups of fixing holes, which are distributed up and down and arranged along the length direction of the bone plate 3, increasing the installation stability of the bone plate 3.

[0032] As a specific embodiment of the isthmic spondylolisthesis fixation device provided by the present invention, please refer to Figures 1 to 3 The fixing nail 4 penetrates into the inferior articular process.

[0033] Specifically, please refer to Figures 1 to 3 The fixing nail 4 penetrates into the part with more bone mass and can penetrate into the inferior articular process, increasing the implantation stability of the fixing nail 4.

[0034] As a specific embodiment of the isthmic spondylolisthesis fixation device provided by the present invention, please refer to Figures 1 to 3 A universal ball head 2 is provided at the rear end of the pedicle screw 1. The universal ball head 2 is matched with the front end of the mounting nail seat 11. A limiting seat 12 is arranged in the mounting nail seat 11. The limiting seat 12 is arranged at the rear side of the universal ball head 2 to limit the universal ball head 2.

[0035] Specifically, please refer to Figures 1 to 3, the universal ball head 2 is arranged at the rear end of the pedicle screw 1 and is arranged inside the mounting socket 11, at the front end of the mounting socket 11. The side wall at the front end of the mounting socket 11 matches the universal ball head 2. The angle between the mounting socket 11 and the pedicle screw 1 is adjustable. The angle of the mounting socket 11 is adjusted according to the actual installation situation. The limiting seat 12 is arranged inside the mounting socket 11. The front side wall of the limiting seat 12 matches the universal ball head 2. The limiting seat 12 presses the universal ball head 2, which helps to lock the position and angle of the mounting socket 11.

[0036] As a specific embodiment of the isthmic spondylolisthesis fixation device provided by the present invention, please refer to Figures 1 to 3 , a relief groove adapted to accommodate the upper end of the rod portion 7 is arranged at the rear end of the limiting seat 12.

[0037] Specifically, please refer to Figures 1 to 3 , a relief groove is arranged on the side wall of the mounting socket 11. The relief groove is arranged along the length direction of the mounting socket 11. The relief groove is a U-shaped groove. The opening of the relief groove is arranged at the rear end of the mounting socket 11 away from the pedicle screw 1. There are two groups of relief grooves, and the two groups of relief grooves are arranged oppositely. The upper end of the rod portion 7 passes through the two groups of relief grooves, which is convenient for the installation of the lamina hook 6.

[0038] As a specific embodiment of the isthmic spondylolisthesis fixation device provided by the present invention, please refer to Figures 1 to 3 , a locking seat 13 is arranged inside the mounting socket 11. The locking seat 13 is arranged at the rear side of the lamina hook 6 to limit the upper end of the rod portion 7 inside the mounting socket 11.

[0039] Specifically, please refer to Figures 1 to 3 , the locking seat 13 is arranged inside the mounting socket 11. The locking seat 13 is arranged at the rear side of the rod portion 7 away from the pedicle screw 1. The rear side wall of the limiting seat 12 matches the shape of the rod portion 7. The front side wall of the locking seat 13 matches the shape of the rod portion 7. The locking seat 13 presses the rod portion 7 of the lamina hook 6 against the limiting seat 12.

[0040] As a specific embodiment of the isthmic spondylolisthesis fixation device provided by the present invention, please refer to Figures 1 to 3 , the locking seat 13 is in threaded cooperation with the mounting socket 11.

[0041] Specifically, please refer to Figures 1 to 3 , the outer side wall of the locking seat 13 is in threaded cooperation with the inner side wall of the mounting socket 11 to increase the fixing stability of the device. A rotation groove 14 for facilitating the rotation of the locking seat 13 is arranged on the rear side wall of the locking seat 13.

[0042] As a specific embodiment of the isthmic spondylolisthesis fixation device provided by the present invention, please refer to Figures 1 to 3 , the lower end of the bone plate 3 is located above the lower end of the lamina hook 6.

[0043] Specifically, please refer to Figures 1 to 3 , the lower end of the lamina hook 6 is located below the lower end of the bone plate 3, and the bone plate 3 is located on the front side of the lamina hook 6.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An isthmic spondylolisthesis fixation device, characterized in that, It includes pedicle screws, laminar hooks and bone plates. An installation socket is provided at the tail of the pedicle screw. The laminar hook includes a rod portion and a hook portion. The hook portion is provided at the lower end of the rod portion. The hook portion faces the vertebral body. A fixing sharp cone is provided on the side wall of the hook portion close to the vertebral body. The upper end of the rod portion penetrates through the installation socket. A locking hole is provided at the upper end of the bone plate. The pedicle screw passes through the locking hole to fix the bone plate to the posterior wall of the vertebral body.

2. The isthmic spondylolisthesis fixation device according to claim 1, wherein, The bone plate is arranged to fit the posterior wall of the vertebral body.

3. The isthmic spondylolisthesis fixation device according to claim 1, characterized in that, Fixing holes are provided on the bone plate, and fixing screws are inserted through the fixing holes.

4. The isthmic spondylolisthesis fixation device according to claim 3, wherein Two groups of the fixing holes are arranged along the length direction of the bone plate.

5. The isthmic spondylolisthesis fixing device according to claim 3, characterized in that, The fixing screw penetrates into the inferior articular process.

6. The isthmic spondylolisthesis fixation device according to claim 1, wherein, A universal ball head is provided at the rear end of the pedicle screw. The universal ball head matches the front end of the installation socket. A limiting seat is provided inside the installation socket. The limiting seat is arranged at the rear side of the universal ball head to limit the universal ball head.

7. The isthmic spondylolisthesis fixation device according to claim 6, characterized in that, A relief groove adapted to accommodate the upper end of the rod portion is provided at the rear end of the limiting seat.

8. The isthmic spondylolisthesis fixation device according to claim 7, wherein, A locking seat is provided inside the installation socket. The locking seat is arranged at the rear side of the laminar hook to limit the upper end of the rod portion inside the installation socket.

9. The isthmic spondylolisthesis fixation device according to claim 8, characterized in that The locking seat is in threaded cooperation with the installation socket.

10. The isthmic spondylolisthesis fixation device according to claim 1, wherein, The lower end of the bone plate is above the lower end of the laminar hook.

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