Intervertebral fusion device

Abstract

The interbody fusion device comprises an interbody fusion cage and two tension pieces, the interbody fusion cage is provided with a cavity structure and two nail holes, the interbody fusion cage is attached to an upper vertebral body and a lower conical body, and a bone graft capable of making contact with the upper vertebral body and the lower conical body is arranged in the cavity structure; the two tension pieces are arranged at an angle to each other and penetrate through the nail holes respectively, so that the interbody fusion cage tightens the upper cone and the lower cone respectively, and the tension pieces are provided with spring pieces capable of being clamped with the nail holes to prevent the installed tension pieces from moving; the interbody fusion cage can apply longitudinal pressurizing force to the upper cone and the lower cone through the two tension pieces which are arranged at an angle, longitudinal bidirectional pressurizing of intervertebral space is achieved, therefore, the intervertebral space is more stable, the bone grafting fusion rate is higher, the tension pieces are provided with the spring pieces which can be connected with the nail holes in a clamped mode, the tension pieces can be prevented from moving, and the bone grafting fusion rate is improved. Displacement of the fusion cage is reduced, and the problem that intervertebral pressurization cannot be achieved due to the fact that the structural design of a zero-cut steel plate is unreasonable can be solved.

Description

Technical Field

[0001] The utility model relates to the field of medical technology, in particular to an intervertebral fusion device. Background Art

[0002] Anterior cervical spinal decompression, intervertebral fusion, and vertebral fixation are one of the main surgeries for the treatment of cervical spondylosis and cervical fracture and dislocation. Traditional vertebral fixation requires the placement of a small steel plate in front of the intervertebral space and fixation to the upper and lower vertebrae after the intervertebral fusion device is placed. The implantation of the steel plate brings a series of complications, such as compression of the front esophagus causing a foreign body sensation in swallowing and dysphagia.

[0003] Currently, "zero-profile" steel plates are available clinically, which are made by integrating the steel plate and the fusion device into one, and are used to treat cervical spondylosis and cervical fracture and dislocation. Such zero-profile steel plates have unreasonable structural design problems. For example, zero-profile steel plates cannot achieve intervertebral pressurization, which leads to postoperative screw loosening, intervertebral fusion device displacement, and intervertebral bone non-fusion.

[0004] Therefore, how to avoid the problem of being unable to achieve intervertebral compression due to unreasonable zero-cut plate structure design is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0005] The utility model aims to provide an intervertebral fusion device, which can avoid the problem that intervertebral compression cannot be achieved due to unreasonable zero-cut steel plate structure design.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An intervertebral fusion device is used to fuse an upper vertebral body and a lower cone separated from each other. The intervertebral fusion device comprises:

[0008] The intervertebral fusion device is provided with a cavity structure and two nail holes. The intervertebral fusion device is fitted to the upper vertebral body and the lower cone. The cavity structure is provided with a bone graft capable of contacting the upper vertebral body and the lower cone.

[0009] Two tension members are arranged at an angle to each other and are respectively inserted into the nail holes so that the intervertebral fusion cage can respectively tighten the upper vertebral body and the lower cone. The tension members are provided with spring sheets that can be engaged with the nail holes to prevent the tension members from moving after installation.

[0010] Preferably, the intervertebral fusion device includes a front wall and a rear wall, two nail holes are arranged at intervals in the front wall, the cavity structure is located between the front wall and the rear wall, and the cavity structure is surrounded by a first side wall and a second side wall, and the first side wall and the second side wall are used to connect the cavity structure with the outside.

[0011] Preferably, the first side wall is provided with a window, and the window is movable relative to the first side wall so that the bone graft can enter the cavity structure.

[0012] Preferably, the first side wall and the second side wall are both mesh structures.

[0013] Preferably, the intervertebral fusion cage is further provided with a positioning member, which is located on the rear wall and is used for positioning the intervertebral fusion cage.

[0014] Preferably, the projections of the two tension members on the horizontal plane are parallel to each other, and the angles between the two tension members and the front wall are both 45°.

[0015] Preferably, the tension member is a semi-threaded tension screw.

[0016] Preferably, the back wall is provided with rounded corners around it, the intervertebral fusion cage is in a constricted shape, and the smaller end is located on the back wall.

[0017] Preferably, the spring sheets are located on both sides of the tension member, and the spring sheets are specifically semicircular.

[0018] Compared with the above-mentioned background technology, the intervertebral fusion device provided by the utility model is used to fuse the upper vertebra and the lower cone separated from each other. The intervertebral fusion device includes an intervertebral fusion device and two tension members. The intervertebral fusion device is provided with a cavity structure and two nail holes. The intervertebral fusion device is fitted to the upper vertebra and the lower cone. The cavity structure is provided with a bone graft that can contact the upper vertebra and the lower cone. The two tension members are arranged at an angle to each other and are respectively inserted into the nail holes so that the intervertebral fusion device can tighten the upper vertebra and the lower cone respectively. The tension members are provided with spring sheets that can be engaged with the nail holes to prevent the tension members from moving after installation.

[0019] Specifically, two tension members arranged at angles to each other are respectively inserted into the nail holes, so that the intervertebral fusion device can tighten the upper vertebral body and the lower cone respectively. The tension members can enable the intervertebral fusion device to apply longitudinal pressure to the upper vertebral body and the lower cone, thereby realizing longitudinal bidirectional pressure between the vertebrae, making the fusion device closer to the upper vertebral body and the lower cone, thereby making the intervertebral space more stable and making the bone graft fusion rate in the cavity structure higher. The tension member is provided with a spring sheet that can be engaged with the nail hole to prevent the tension member from moving and reduce the occurrence of fusion device displacement. Such a setting can avoid the problem of being unable to achieve intervertebral pressure due to unreasonable design of the zero-cut steel plate structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1A schematic diagram of the structure of the intervertebral fusion device provided by an embodiment of the utility model;

[0022] Figure 2 This is a schematic structural diagram of the intervertebral fusion device provided by an embodiment of the utility model from another perspective.

[0023] in:

[0024] 1-upper vertebral body, 2-lower cone;

[0025] 100 - intervertebral fusion cage, 110 - cavity structure, 120 - nail hole, 130 - front wall, 140 - back wall, 150 - first side wall, 160 - second side wall;

[0026] 200-tension piece, 210-spring leaf. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside" and "outside" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as a limitation of the present invention.

[0030] The utility model aims to provide an intervertebral fusion device, which can avoid the problem that intervertebral compression cannot be achieved due to unreasonable zero-cut steel plate structure design.

[0031] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0032] See also Figure 1 and Figure 2 The present embodiment provides an intervertebral fusion device for fusing an upper vertebral body 1 and a lower cone 2 spaced apart from each other. The intervertebral fusion device includes an intervertebral fusion cage 100 and two tension members 200 .

[0033] The intervertebral fusion cage 100 is provided with a cavity structure 110 and two nail holes 120 . The intervertebral fusion cage 100 is fitted to the upper vertebral body 1 and the lower cone 2 . A bone graft capable of contacting the upper vertebral body 1 and the lower cone 2 is provided in the cavity structure 110 .

[0034] It is understandable that the intervertebral fusion cage 100 is provided with a cavity structure 110 inside, which is used to place bone grafts that can contact the upper vertebral body 1 and the lower cone 2, so as to improve the healing process through bone grafts.

[0035] Among them, the outer contour of the cavity structure 110 in this embodiment is preferably spherical, which can increase the contact area between the bone graft and the upper vertebral body 1 and the lower cone 2, and increase the bone graft fusion rate. The outer contour of the cavity structure 110 can be adjusted according to actual conditions as long as the above purpose can be achieved.

[0036] The two tension members 200 are arranged at an angle to each other and are respectively inserted into the nail holes 120 so that the intervertebral fusion cage 100 can tighten the upper vertebral body 1 and the lower cone 2 respectively. The tension members 200 are each provided with a spring sheet 210 that can be engaged with the nail holes 120 to prevent the tension members 200 from moving after installation.

[0037] It should be noted that, among them, one tension piece 200 is used to tighten the upper vertebral body 1 and the intervertebral fusion cage 100, and the other tension piece 200 is used to tighten the lower cone 2 and the intervertebral fusion cage 100, and the two tension pieces 200 are both arranged at an angle so that the intervertebral fusion cage 100 tightens the upper vertebral body 1 and the lower cone 2 respectively. In addition, the shape and size of the nail hole 120 can be adjusted according to actual conditions, and are not specifically limited here, as long as they can be adapted to the tension piece 200 and the spring sheet 210.

[0038] Specifically, two tension members 200 arranged at an angle to each other are respectively inserted into the nail holes 120, so that the intervertebral fusion device 100 can respectively tighten the upper vertebral body 1 and the lower cone 2. The tension member 200 can enable the intervertebral fusion device 100 to apply longitudinal pressure to the upper vertebral body 1 and the lower cone 2, thereby realizing longitudinal bidirectional pressure between the vertebrae, making the fusion device closer to the upper vertebral body 1 and the lower cone 2, thereby making the intervertebral space more stable and making the bone graft fusion rate in the cavity structure 110 higher. The tension member 200 is provided with a spring sheet 210 that can be engaged with the nail hole 120, which can prevent the tension member 200 from moving and reduce the occurrence of fusion device displacement. Such a setting can avoid the problem of being unable to achieve intervertebral pressure due to unreasonable design of the zero-cut steel plate structure.

[0039] Preferably, the intervertebral fusion cage 100 includes a front wall 130 and a rear wall 140, two nail holes 120 are spaced apart in the front wall 130, the cavity structure 110 is located between the front wall 130 and the rear wall 140, and a first side wall 150 and a second side wall 160 are provided around the cavity structure 110, and the first side wall 150 and the second side wall 160 are used to connect the cavity structure 110 with the outside.

[0040] It can be understood that the intervertebral fusion cage 100 includes a front wall 130 and a rear wall 140 located on both sides of the cavity structure 110, and the front wall 130 and the rear wall 140 are connected by a first side wall 150 and a second side wall 160. Through an incision in the front of the neck, the skin, subcutaneous tissue, and platysma muscle are cut in sequence, and the carotid sheath and the visceral sheath are pulled to both sides respectively to expose the front of the cervical vertebral body and the front of the intervertebral disc.

[0041] After the surgical segment is determined by fluoroscopic positioning, the intervertebral space is decompressed. After sufficient decompression, a trial mold is used and an intervertebral fusion cage 100 of appropriate size is selected. The front wall 130 is slowly knocked with a hammer and a push rod to make the back wall 140 of the intervertebral fusion cage 100 advance to a suitable position until the front wall 130 of the intervertebral fusion cage 100 is flush with the front edge of the vertebral body. Two tension members 200 are respectively inserted and locked to apply intervertebral pressure until the spring sheet 210 is engaged with the nail hole 120.

[0042] Preferably, the first side wall 150 is provided with a window, and the window can move relative to the first side wall 150 to allow the bone graft to enter the cavity structure 110 .

[0043] In this embodiment, the first side wall 150 is preferably located on a side of the intervertebral fusion cage 100 close to the upper vertebral body 1, and the first side wall 150 is provided with a window that can move relative to the first side wall 150, and the bone graft is allowed to enter the cavity structure 110 by opening the window, and then the window is closed to prevent the bone graft from being separated from the cavity structure 110.

[0044] The window is preferably an elastic window with an elastic member, that is, it is opened by artificial external force and automatically closed by the elastic member when no external force is applied.

[0045] Preferably, the first side wall 150 and the second side wall 160 are both mesh structures.

[0046] It is understandable that the first side wall 150 and the second side wall 160 are both mesh structures, which facilitate the contact between the upper vertebral body 1 and the lower cone 2 and the bone graft, and are conducive to automatic healing after surgery. In addition, the specific pore size of the mesh structure can be adjusted according to actual conditions to achieve the above purpose.

[0047] Preferably, the intervertebral fusion cage 100 is further provided with a positioning member, which is located on the rear wall 140 and is used to position the intervertebral fusion cage 100 .

[0048] In addition, the intervertebral fusion cage 100 is also provided with a positioning piece for detecting its own position. When the intervertebral fusion cage 100 is advanced to a certain depth, the position of the positioning piece can be detected by an external device until the intervertebral fusion cage 100 moves to a specified position. The provision of the positioning piece can improve installation accuracy and efficiency.

[0049] Preferably, the projections of the two tension members 200 on the horizontal plane are parallel to each other, and the angles between the two tension members 200 and the front wall 130 are both 45°.

[0050] In this embodiment, in the side view, after the intervertebral fusion cage 100 is inserted into the intervertebral space, the front wall 130 of the intervertebral fusion cage 100 can be flush with the front edges of the upper vertebral body 1 and the lower cone 2, and the tension piece 200 can be inserted at an angle of 45° through the nail hole 120 in the front of the device, and the two tension screws form an angle of 90°. In the front view, the two tension pieces 200 are designed to be horizontally parallel.

[0051] Preferably, the tension member 200 is specifically a semi-threaded tension screw.

[0052] It should be noted that the tension member 200 is preferably a 3.5 mm half-thread tension screw. After the two half-thread tension screws are tightened, the intervertebral fusion cage 100 can apply longitudinal pressure to the upper vertebral body 1 and the lower cone 2, thereby achieving longitudinal bidirectional pressure between the vertebrae, thereby making the intervertebral space more stable and increasing the bone graft fusion rate.

[0053] Use two 3.5mm thick nails with deeper tail threads. On the one hand, this increases the holding force of the screws, and on the other hand, it makes nail insertion easier and reduces the occurrence of slipping threads.

[0054] Preferably, the rear wall 140 is provided with rounded corners around its periphery, and the intervertebral fusion cage 100 is in a constricted shape, with the smaller end being located at the rear wall 140 .

[0055] It is understandable that the intervertebral fusion cage 100 is in a constricted shape with the smaller end located at the rear wall 140, which facilitates the installation of the intervertebral fusion cage 100 so that the intervertebral fusion cage 100 fits the upper vertebral body 1 and the lower cone 2. The rear wall 140 is provided with rounded corners around to reduce installation resistance.

[0056] Preferably, the spring pieces 210 are located on both sides of the tension member 200 , and the spring pieces 210 are specifically semicircular.

[0057] Two semicircular spring sheets 210 are designed at one end of each tension member 200 close to the front wall 130. When the tension member 200 is pushed into place, the spring sheet 210 partially closes the nail hole 120 under the action of elastic force to prevent the screw from retreating. The shape of the spring sheet 210 can be adjusted according to actual conditions as long as the above purpose can be achieved.

[0058] In summary, the device of the utility model is designed according to the anatomical structure of the cervical intervertebral space. In the side view, after the intervertebral fusion device 100 is placed in the intervertebral space, the front wall 130 of the intervertebral fusion device 100 can be flush with the front edge of the upper vertebral body 1 and the lower cone 2, and is fixed by two tension members 200. The tension members 200 can be inserted at an angle of 45° through the nail holes 120 on the front wall 130, and the two tension members 200 form a 90° angle. On the one hand, after the tension members 200 are locked, the intervertebral fusion device 100 can apply longitudinal pressure to the upper vertebral body 1 and the lower cone 2, realizing longitudinal bidirectional pressure between the vertebrae, thereby making the intervertebral space more stable and the bone graft fusion rate higher; on the other hand, the tension member 200 is a 3.5mm semi-threaded tension screw with a deeper screw tail thread, which increases the screw holding force while making it easier to insert the screw and reducing the occurrence of slipping threads. A cavity structure 110 for placing bone graft is provided in the center of the intervertebral fusion cage 100, which can increase the contact area between the bone graft and the upper vertebral body 1 and the lower cone 2, and increase the bone graft fusion rate. In addition, when the tension member 200 is deep enough, the spring sheet 210 partially closes the nail hole 120 under the action of elastic force to prevent the tension member 200 from retreating. Such a setting can avoid the problem of being unable to achieve intervertebral pressurization due to unreasonable design of the zero-cut steel plate structure.

[0059] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0060] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0061] The above is a detailed introduction to the embodiments provided by the utility model. This article uses specific examples to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An intervertebral fusion device for fusing an upper vertebral body (1) and a lower cone (2) spaced apart from each other, characterized in that: The intervertebral fusion device comprises: An intervertebral fusion cage (100) is provided with a cavity structure (110) and two nail holes (120), wherein the intervertebral fusion cage (100) is fitted to the upper vertebral body (1) and the lower cone (2), and a bone graft capable of contacting the upper vertebral body (1) and the lower cone (2) is provided in the cavity structure (110); Two tension members (200) are arranged at an angle to each other and are respectively inserted into the nail holes (120) so that the intervertebral fusion cage (100) can respectively tighten the upper vertebral body (1) and the lower cone (2). The tension members (200) are each provided with a spring sheet (210) that can be engaged with the nail holes (120) to prevent the tension members (200) from moving after installation.

2. The intervertebral fusion device according to claim 1, characterized in that: The intervertebral fusion cage (100) comprises a front wall (130) and a rear wall (140), the two nail holes (120) are arranged at intervals on the front wall (130), the cavity structure (110) is located between the front wall (130) and the rear wall (140), and the cavity structure (110) is surrounded by a first side wall (150) and a second side wall (160), and the first side wall (150) and the second side wall (160) are used to connect the cavity structure (110) with the outside.

3. The intervertebral fusion device according to claim 2, characterized in that: The first side wall (150) is provided with a window, and the window is movable relative to the first side wall (150) so as to allow the bone graft to enter the cavity structure (110).

4. The intervertebral fusion device according to claim 2, characterized in that: The first side wall (150) and the second side wall (160) are both mesh structures.

5. The intervertebral fusion device according to claim 2, characterized in that: The intervertebral fusion cage (100) is also provided with a positioning member, which is located on the rear wall (140) and is used to position the intervertebral fusion cage (100).

6. The intervertebral fusion device according to claim 2, characterized in that: The projections of the two tension members (200) on the horizontal plane are parallel to each other, and the angles between the two tension members (200) and the front wall (130) are both 45°.

7. The intervertebral fusion device according to claim 1, characterized in that: The tension member (200) is specifically a semi-threaded tension screw.

8. The intervertebral fusion device according to claim 2, characterized in that: The rear wall (140) is provided with rounded corners on all sides, and the intervertebral fusion cage (100) is in a constricted shape, with the smaller end being located on the rear wall (140).

9. The intervertebral fusion device according to any one of claims 1 to 8, characterized in that: The spring sheets (210) are located on both sides of the tension member (200), and the spring sheets (210) are specifically semicircular.

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