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 straddled on the two connecting plates, and both connecting plates are provided with through holes; a bridging plate, the bridging plate comprising a plate body and a filling block arranged on the plate body; a bridging screw, the bridging screw passes through the through hole and cooperates with the filling block to connect the occipital-cervical fusion plate and the bridging plate together. The technical solution of the present invention effectively solves the problem of easy failure caused by uneven force after the atlantoaxial fusion device in the prior art is 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 through holes; a bridging plate, the bridging plate comprises a plate body and a filling block arranged on the plate body; a bridging screw, the bridging screw passes through the through hole and cooperates with the filling block to connect the occipital-cervical fusion plate and the bridging plate together.

[0006] Furthermore, the bridging plate also includes a mounting portion, the mounting portion is connected to the plate body, and the filling block is arranged in the mounting portion.

[0007] Furthermore, the mounting portion is a cylindrical structure with a notch, and the bridging screw passes through the notch and cooperates with the filling block.

[0008] Further, the filling block is made of plastic material.

[0009] Furthermore, the plastic material is polyethylene.

[0010] Furthermore, the via hole has a via sleeve, and the length of the via sleeve is greater than the thickness of the connecting plate.

[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] 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.

[0013] 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.

[0014] Furthermore, a plurality of screw holes are arranged on the occipital plate.

[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 screw passes through the through hole, and then passes through the bone gap of the cervical vertebrae and is connected to the filling block. 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 structure of a bridge plate of an anterior-posterior combined atlantoaxial fusion device; and

[0019] Figure 3 Shows Figure 1 Schematic diagram of the structure of the bridging screw of the anterior-posterior atlantoaxial fusion device.

[0020] The above drawings include the following reference numerals:

[0021] 10. Occipital-cervical fusion plate; 20. Bridging plate; 21. Plate body; 22. Filling block; 23. Mounting part; 30. Bridging screw. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figures 1 to 3 As shown, a combined anterior-posterior atlantoaxial fusion device of this embodiment includes: an occipital-cervical fusion plate 10, which includes an occipital plate, two connecting plates and a cervical plate, wherein the two connecting plates are respectively connected to the two ends of the occipital plate, the cervical plate is straddled on the two connecting plates, and both connecting plates are provided with through holes. A bridging plate 20, which includes a plate body 21 and a filling block 22 provided on the plate body 21. A bridging screw 30, which passes through the through hole and cooperates with the filling block to connect the occipital-cervical fusion plate 10 and the bridging plate 20 together.

[0027] By applying the technical solution of the present invention, the occipital bone is supported by the occipital plate, the cervical vertebrae is 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 10. The occipital-cervical fusion plate 10 is located at the rear side of the cervical vertebrae, and the bridging plate 20 is located at the front side of the cervical vertebrae. The bridging screw 30 passes through the through hole, and then passes through the bone gap of the cervical vertebrae and is connected to the filling block 22. 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 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.

[0028] like Figures 1 to 3 As shown, in the technical solution of this embodiment, the bridge plate 20 also includes a mounting portion 23, the mounting portion 23 is connected to the plate body 21, and the filling block 22 is arranged in the mounting portion 23. The arrangement of the mounting portion 23 makes the arrangement of the filling block 22 more flexible. For example, the position of the mounting portion 23 can be arranged according to the position where the bridge screw 30 needs to be connected, and then the position of the filling block 22 can be arranged. There are two bridge plates 20 arranged corresponding to the two connecting plates, and each bridge plate 20 includes a plate body 21, a filling block 22 and a mounting portion 23.

[0029] like Figure 1 and Figure 2 As shown, in the technical solution of this embodiment, the mounting portion 23 is a cylindrical structure with a notch, and the bridging screw 30 passes through the notch to cooperate with the filling block 22. The above structure has low processing cost, convenient installation and easy operation. The plate body 21 is a rectangle with a bent structure, and the extension direction of the rectangle is parallel to the axial direction of the cylindrical structure, and the notch of the cylindrical structure is opposite to the corresponding connecting plate.

[0030] like Figure 1 and Figure 2 As shown, in the technical solution of this embodiment, the filling block 22 is made of plastic material. The filling block 22 is made of plastic material, so that the filling block 22 can be interference-fitted with the cylindrical structure.

[0031] like Figure 1 and Figure 2 As shown, in the technical solution of this embodiment, the plastic material is polyethylene. Such a material is easy to obtain, and the bridging screw 30 passes through the through hole and then passes through the gap between the bones to enter the polyethylene. The bridging screw 30 can penetrate into the polyethylene to achieve the connection between the occipital-cervical fusion plate 10 and the bridging plate.

[0032] like Figure 1 As shown, in the technical solution of this embodiment, the via hole has a via sleeve, and the length of the via sleeve is greater than the thickness of the connecting plate. In this way, the bridging screw 30 is more stable during connection.

[0033] like Figures 1 to 3 As shown, in the technical solution of this embodiment, 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. In this way, the connecting plate 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.

[0034] like Figures 1 to 3 As shown, in the technical solution of this embodiment, the occipital plate is an arc-shaped plate, and two connecting plates 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.

[0035] like Figures 1 to 3 As shown, in the technical solution of this embodiment, 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 and the occipital bone fit together. The thickness of the occipital plate is the same so that their ability to withstand the force is the same. The occipital plate fits the occipital bone, so that the occipital plate has a better support effect on the occipital bone.

[0036] like Figures 1 to 3 As shown, in the technical solution of this embodiment, a plurality of screw holes are arranged on the occipital plate. The above structure can reduce the foreign body sensation after implantation.

[0037] From the above, it can be known that the occipital plate 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 remains consistent, which ensures the strength of the occipital plate while effectively reducing the notch after prosthesis implantation, which is conducive to postoperative suturing and can effectively reduce the foreign body sensation after implantation. The connecting plate 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 of the atlantoaxial fusion device fit closely with the atlas and axis respectively (designed accordingly after CT reverse modeling). The thickness of the plates is consistent, which ensures the strength of the plates while reducing the notch after implantation of the prosthesis, which can effectively reduce the foreign body sensation after implantation. The left and right connecting plates of the atlantoaxial fusion system are equipped with a series of screw holes, which can be inserted with screws to fix the atlas and axis after reduction. The threaded holes have a petal self-locking mechanism. Screwing in the corresponding self-locking screws can cooperate with the tapered thread at the tail of the self-locking screws for universal locking. The connecting plates on the left and right sides are arranged in an inverted eight-shaped pattern. One screw hole is set in the atlas part, which can be inserted with screws to drive into the atlas lateral mass. Two vertical screw holes are set in the axis part, which can be inserted with screws to drive into the vertebral body. This design ensures the fixation of the plate while being close to the midline of the human body, making it easy to insert screws under a small incision during surgery. The length of the bridging screw 30 is a preoperative custom length, which can ensure that the bridging screw can just sink into the connecting plates on the left and right sides of the anterior-posterior atlantoaxial fusion device, and its threaded portion 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 atlantoaxial fusion device. The material of the anterior-posterior 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 are only preferred embodiments of the present invention and are 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) is located at the rear side of the cervical spine, the occipital-cervical fusion plate (10) comprising an occipital bone plate, two connecting plates and a cervical bone plate, the two connecting plates being respectively connected to two ends of the occipital bone plate, the cervical bone plate being bridged over the two connecting plates, and the two connecting plates are both provided with through holes; A bridging plate (20) located at the front side of the cervical vertebra, the bridging plate (20) comprising a plate body (21) and a filling block (22) disposed on the plate body (21); A bridging screw (30) passes through the through hole and the bone gap of the cervical vertebra and cooperates with the filling block (22) to connect the occipital-cervical fusion plate (10) and the bridging plate (20) together.

2. The anterior-posterior combined atlantoaxial fusion device according to claim 1, characterized in that: The bridging plate (20) further comprises a mounting portion (23), wherein the mounting portion (23) is connected to the plate body (21), and the filling block (22) is arranged in the mounting portion (23).

3. The anterior-posterior atlantoaxial fusion device according to claim 2, characterized in that: The mounting portion (23) is a cylindrical structure having a notch, and the bridging screw (30) passes through the notch to cooperate with the filling block (22).

4. The anterior-posterior atlantoaxial fusion device according to claim 2, characterized in that: The filling block (22) is made of plastic material.

5. The anterior-posterior combined atlantoaxial fusion device according to claim 4, characterized in that: The plastic material is polyethylene.

6. The anterior-posterior atlantoaxial fusion device according to claim 1, characterized in that: The via hole has a via sleeve, and the length of the via sleeve is greater than the thickness of the connecting plate.

7. The anterior-posterior atlantoaxial fusion device according to claim 1, characterized in that: The connecting plate includes a first plate segment and a second plate segment, the first plate segment is disposed between the second plate segment and the occipital plate, and the first plate segment and the second plate segment form a predetermined angle.

8. The anterior-posterior combined atlantoaxial fusion device according to any one of claims 1 to 7, characterized in that: 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.

9. The anterior-posterior atlantoaxial fusion device according to claim 8, characterized in that: The thickness of the occipital plate is the same, and the contour of the occipital plate is consistent with that of the occipital bone so that the occipital plate fits the occipital bone.

10. The anterior-posterior combined atlantoaxial fusion device according to claim 9, characterized in that: The occipital plate is provided with a plurality of screw holes.

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