Anterior-posterior atlantoaxial fusion device

Abstract

The present invention provides an anterior-posterior combined atlantoaxial fusion device, comprising: an occipital-cervical fusion plate, the occipital-cervical fusion plate comprising an occipital plate, two connecting plates and a cervical bone plate, the two connecting plates are respectively connected to the two ends of the occipital plate, the cervical bone plate is bridged on the two connecting plates, and both connecting plates are provided with a first connecting hole; a bridging plate, the bridging plate is provided with a second connecting hole; and a bridging screw, the bridging screw connects the occipital-cervical fusion plate and the bridging plate together through the first connecting hole and the second connecting hole. The technical solution of the present invention effectively solves the problem that the atlantoaxial fusion device in the prior art is prone to failure due to uneven force after being connected to the bone.

Description

Technical Field

[0001] The present invention relates to the technical field of atlantoaxial fusion, and in particular to an anterior-posterior combined atlantoaxial fusion device. Background Art

[0002] Atlantoaxial dislocation refers to the loss of normal apposition between the first segment (atlas) and the second segment (axis) of the cervical spine, which causes compression of the medulla oblongata and the high cervical spinal cord, changes in the direction of the vertebral artery and hemodynamics; in mild cases, dizziness or syncope may occur, and in severe cases, it may lead to quadriplegia or even respiratory failure and death. Due to its high disability and mortality rates, atlantoaxial dislocation is one of the hot spots and difficulties in spinal surgery research worldwide. Atlantoaxial fusion is currently recognized as the most effective method for treating atlantoaxial dislocation. Posterior atlantoaxial fusion is easy to expose and has a large operating space, and is widely used in clinical practice. With the development of technology in recent years, the number of fusions used for anterior joints has gradually increased.

[0003] The widespread use of 3D printing technology in the field of orthopedics has also given people more options in atlantoaxial joint reduction surgery, using customized steel plates in posterior fusion. In the existing technology, the atlantoaxial device is usually fixed to the bone for fixation, but it has been proven through many clinical practices that such a structure is prone to uneven force on the implant, resulting in fatigue damage, failure or loosening of the unilateral prosthesis. Summary of the invention

[0004] The main purpose of the present invention is to provide an anterior-posterior combined atlantoaxial fusion device to solve the problem that the atlantoaxial fusion device in the prior art is prone to failure due to uneven force after being connected to the bone.

[0005] In order to achieve the above-mentioned purpose, the present invention provides an anterior-posterior combined atlantoaxial fusion device, comprising: an occipital-cervical fusion plate, the occipital-cervical fusion plate comprising an occipital plate, two connecting plates and a cervical bone plate, the two connecting plates are respectively connected to the two ends of the occipital plate, the cervical bone plate is bridged on the two connecting plates, and both connecting plates are provided with a first connecting hole; a bridging plate, the bridging plate is provided with a second connecting hole; and a bridging screw, the bridging screw connects the occipital-cervical fusion plate and the bridging plate together through the first connecting hole and the second connecting hole.

[0006] Furthermore, the occipital plate is an arc-shaped plate, and the two connecting plates are respectively connected to two ends of the arc-shaped plate to form a U-shaped structure.

[0007] Furthermore, the thickness of the occipital plate is the same, and the contours of the occipital plate and the occipital bone are consistent so that the occipital plate fits the occipital bone.

[0008] Furthermore, a plurality of screw holes are arranged on the occipital plate.

[0009] Further, the first connecting hole and / or the second connecting hole has an extended threaded sleeve.

[0010] Furthermore, the extended threaded sleeve is a locking thread.

[0011] Further, the connecting plate includes a first plate segment and a second plate segment, the first plate segment is arranged between the second plate segment and the occipital plate, and the first plate segment and the second plate segment form a predetermined angle.

[0012] Further, the cervical bone plate is connected at the connection between the first plate segment and the second plate segment.

[0013] Further, the predetermined angle is between 120° and 170°.

[0014] Furthermore, there are two bridging plates arranged corresponding to the two connecting plates, and each bridging plate is provided with a second connecting hole.

[0015] By applying the technical solution of the present invention, the occipital bone is supported by the occipital plate, the cervical vertebrae are supported by the cervical bone plate, and the occipital plate and the cervical bone plate are connected together by two connecting plates to form an occipital-cervical fusion plate. The occipital-cervical fusion plate is located at the rear side of the cervical vertebrae, and the bridging plate is located at the front side of the cervical vertebrae. The bridging screws pass through the bone gap of the cervical vertebrae to connect the occipital-cervical fusion plate and the bridging plate together. The bridging plate is limited by the cervical vertebrae, so that the force on the occipital-cervical fusion plate and the bridging plate is relatively uniform, and the occipital-cervical fusion plate is not easy to fail. The technical solution of the present invention effectively solves the problem of easy failure caused by uneven force after the atlantoaxial fusion device is connected to the bone in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of an anterior-posterior combined atlantoaxial fusion device according to the present invention is shown;

[0018] Figure 2 Shows Figure 1 A schematic diagram of the three-dimensional structure of the anterior-posterior combined atlantoaxial fusion device from another angle;

[0019] Figure 3 Shows Figure 1 A schematic diagram of the structure of the occipitocervical fusion plate of the anterior-posterior combined atlantoaxial fusion device;

[0020] Figure 4 Shows Figure 1 A schematic diagram of the structure of a bridge plate of an anterior-posterior combined atlantoaxial fusion device; and

[0021] Figure 5Shows Figure 1 Schematic diagram of the structure of the bridging screw of the anterior-posterior atlantoaxial fusion device.

[0022] The above drawings include the following reference numerals:

[0023] 10. Occipital-cervical fusion plate; 11. Occipital plate; 12. Connecting plate; 13. Cervical plate; 20. Bridging plate; 30. Bridging screws. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0027] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of the layers and regions is enlarged, and the same reference numerals are used to represent the same devices, so their description will be omitted.

[0028] like Figures 1 to 5As shown, an anterior-posterior combined atlantoaxial fusion device of this embodiment includes: an occipital-cervical fusion plate 10, a bridging plate 20 and a bridging screw 30. The occipital-cervical fusion plate 10 includes an occipital plate 11, two connecting plates 12 and a cervical plate 13. The two connecting plates 12 are respectively connected to the two ends of the occipital plate 11. The cervical plate 13 is bridged on the two connecting plates 12. The two connecting plates 12 are both provided with a first connecting hole. The bridging plate 20 is provided with a second connecting hole. The bridging screw 30 connects the occipital-cervical fusion plate 10 and the bridging plate 20 together through the first connecting hole and the second connecting hole.

[0029] By applying the technical solution of this embodiment, the occipital bone is supported by the occipital plate 11, the cervical vertebrae is supported by the cervical bone plate 13, and the occipital plate 11 and the cervical bone plate 13 are connected together by two connecting plates 12 to form an occipital-cervical fusion plate 10. The occipital-cervical fusion plate 10 is located at the rear side of the cervical vertebrae, the bridging plate 20 is located at the front side of the cervical vertebrae, and the bridging screws 30 pass through the bone gap of the cervical vertebrae to connect the occipital-cervical fusion plate 10 and the bridging plate 20 together. The bridging plate 20 is limited by the cervical vertebrae, so that the force on the occipital-cervical fusion plate 10 and the bridging plate 20 is relatively uniform, and the occipital-cervical fusion plate 10 is not easy to fail. The technical solution of this embodiment effectively solves the problem of easy failure caused by uneven force after the atlantoaxial fusion device is connected to the bone in the prior art.

[0030] like Figures 1 to 3 As shown, in the technical solution of this embodiment, the occipital plate 11 is an arc-shaped plate, and two connecting plates 12 are respectively connected to the two ends of the arc-shaped plate to form a U-shaped structure. The above structure makes the occipital-cervical fusion plate 10 lighter and uses less material.

[0031] like Figures 1 to 3 As shown, in the technical solution of this embodiment, the thickness of the occipital plate 11 is the same, and the contour of the occipital plate 11 is consistent with the occipital bone so that the occipital plate 11 fits the occipital bone. The thickness of the occipital plate 11 is the same so that its ability to withstand the force is the same. The occipital plate 11 fits the occipital bone, so that the occipital plate 11 has a better support effect on the occipital bone.

[0032] like Figures 1 to 3 As shown, in the technical solution of this embodiment, a plurality of screw holes are provided on the occipital plate 11. The above structure can reduce the foreign body sensation after implantation.

[0033] like Figures 1 to 5As shown, in the technical solution of this embodiment, the first connecting hole and / or the second connecting hole has an extended threaded sleeve. The provision of the extended threaded sleeve makes the stability of the bridging screw 30 better. It should be noted that both the first connecting hole and the second connecting hole are provided with an extended threaded sleeve, the first end of the bridging screw 30 has a thread, and the second end is a hexagonal groove. When the bridging screw 30 passes from the first connecting hole to the second connecting hole, the inner wall of the first connecting hole can be a smooth hole, and the inner wall of the second connecting hole has a locking thread. The locking thread of this embodiment is an inclined thread. When the bridging screw 30 passes from the second connecting hole to the first connecting hole, the inner wall of the second connecting hole can be a smooth hole, and the inner wall of the first connecting hole has a locking thread.

[0034] like Figure 3 As shown, in the technical solution of this embodiment, the connecting plate 12 includes a first plate segment and a second plate segment, the first plate segment is arranged between the second plate segment and the occipital plate 11, and the first plate segment and the second plate segment form a predetermined angle. In this way, the connecting plate 12 can better match the cervical vertebra. Specifically, the connection between the first plate segment and the second plate segment is an arc-shaped transition, which is better adapted to the cervical vertebra. The predetermined angle is between 120° and 170°, so that the matching effect with the cervical vertebra is better.

[0035] like Figure 3 As shown, in the technical solution of this embodiment, the cervical bone plate 13 is connected to the connection between the first plate segment and the second plate segment. The above structure makes the occipital-cervical fusion plate 10 more adaptable to the cervical spine.

[0036] like Figure 4 As shown, in the technical solution of this embodiment, two bridge plates 20 are arranged corresponding to the two connecting plates 12, and each bridge plate 20 is provided with a second connecting hole. The arrangement of the two connecting plates 12 makes the arrangement of the anterior-posterior combined atlantoaxial fusion device more flexible. The plane of each bridge plate 20 that matches the cervical spine is provided with a concave-convex structure, so that the bridge plate 20 is not easy to fall out of the original position.

[0037] From the above, it can be known that the occipital plate 11 of this embodiment is close to the lower extension of the occipital bone, and a row of screw holes are arranged along the lower extension. The thickness of the plate body is kept consistent, which ensures the strength of the occipital plate 11 while effectively reducing the notch after the prosthesis is implanted, which is conducive to postoperative suturing and can effectively reduce the foreign body sensation after implantation. The connecting plate 12 serves to connect the cervical vertebrae and the spinal column. At the same time, a guide screw hole can be set, and the nail can be accurately placed in the pedicle of the atlas. The vertebral fixation plate is an H-shaped plate, and the middle part is close to the vertebral spinous process, which can play a role in intraoperative positioning. At the same time, a screw guide hole is set, and the screw can be accurately placed in the spinous process. There are two rows of guide screw holes on both sides, which can accurately place the screw into the pedicle or lateral mass. The role of the guide screw hole is that there is no need to adjust the direction of the screw placement during the operation. At the same time, preoperative planning can ensure the safety and effectiveness of the direction of the screw placement, and ensure the safety and effectiveness of the prosthesis implantation. The left and right connecting plates 12 of the atlantoaxial fusion device are respectively closely fitted with the atlas and the axis (after CT reverse modeling, the corresponding design is carried out), and the plate body thickness is consistent, which ensures the strength of the plate body while reducing the notch after the prosthesis is implanted, which can effectively reduce the foreign body sensation after implantation. The left and right connecting plates 12 of the atlantoaxial fusion system are both provided with a series of screw holes, which can be inserted with screws to fix the atlas and the axis after reduction, respectively. The threaded holes have a petal self-locking mechanism, and the corresponding self-locking screws are screwed in, which can be matched with the tapered thread at the tail of the self-locking screw for universal locking. The connecting plates 12 on the left and right sides are arranged in an inverted eight-character arrangement, and one nail hole is set in the atlas part, and a screw can be inserted into the atlas lateral mass, and two vertical nail holes are set in the axis part, and screws can be inserted into the vertebral body. Such a design ensures that the plate body is fixed, and the design close to the midline of the human body makes it easy to insert screws under a small incision during surgery. The length of the bridging screw 30 is a pre-operative custom length, which can ensure that the bridging screw can just sink into the connecting plates 12 on the left and right sides of the anterior-posterior combined atlantoaxial fusion device, and the threaded portion thereof cooperates with the thread of the posterior occipital-cervical fusion system, and the length of the screw does not exceed the threaded hole of the anterior-posterior combined atlantoaxial fusion device. The material of the anterior-posterior combined atlantoaxial fusion device of this embodiment is titanium alloy.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anterior-posterior combined atlantoaxial fusion device, characterized in that: include: An occipital-cervical fusion plate (10), the occipital-cervical fusion plate (10) comprising an occipital bone plate (11), two connecting plates (12) and a cervical bone plate (13), the two connecting plates (12) being respectively connected to two ends of the occipital bone plate (11), the cervical bone plate (13) being bridged on the two connecting plates (12), and the two connecting plates (12) being both provided with a first connecting hole; A bridging plate (20), wherein the bridging plate (20) is provided with a second connecting hole; A bridging screw (30), wherein the bridging screw (30) connects the occipital-cervical fusion plate (10) and the bridging plate (20) together through the first connecting hole and the second connecting hole; The connecting plates (12) on the left and right sides are arranged in an inverted eight-shaped pattern, one nail hole is arranged on the atlas part of the connecting plate (12), and two vertical nail holes are arranged on the axis part of the connecting plate (12).

2. The anterior-posterior combined atlantoaxial fusion device according to claim 1, characterized in that: The occipital plate (11) is an arc-shaped plate, and the two connecting plates (12) are respectively connected to two ends of the arc-shaped plate to form a U-shaped structure.

3. The anterior-posterior atlantoaxial fusion device according to claim 2, characterized in that: The thickness of the occipital plate (11) is the same, and the occipital plate (11) is consistent with the contour of the occipital bone so that the occipital plate (11) fits the occipital bone.

4. The anterior-posterior atlantoaxial fusion device according to claim 3, characterized in that: The occipital plate (11) is provided with a plurality of screw holes.

5. The anterior-posterior atlantoaxial fusion device according to claim 1, characterized in that: The first connecting hole and / or the second connecting hole has an extended threaded sleeve.

6. The anterior-posterior combined atlantoaxial fusion device according to claim 5, characterized in that: The extended thread sleeve is a locking thread.

7. The anterior-posterior atlantoaxial fusion device according to claim 1, characterized in that: The connecting plate (12) comprises a first plate segment and a second plate segment, wherein the first plate segment is arranged between the second plate segment and the occipital plate (11), and the first plate segment and the second plate segment form a predetermined angle.

8. The anterior-posterior atlantoaxial fusion device according to claim 7, characterized in that: The cervical bone plate (13) is connected at the connection between the first plate segment and the second plate segment.

9. The anterior-posterior atlantoaxial fusion device according to claim 7, characterized in that: The predetermined angle is between 120° and 170°.

10. The anterior-posterior atlantoaxial fusion device according to claim 1, characterized in that: The two bridging plates (20) are arranged corresponding to the two connecting plates (12), and each of the bridging plates (20) is provided with a second connecting hole.

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