Expandable interbody fusion cage

Abstract

The utility model discloses an interbody fusion cage capable of being opened, and relates to the technical field of medical instruments, in particular to the interbody fusion cage capable of being opened. The anti-sinking device comprises an outer shell, an arc-shaped convex plate, an adjusting plate, a screw rod, a lifting component and an anti-sinking component, the adjusting plate is arranged in the outer shell, and a front-back through hole for the screw rod to penetrate through is formed in the adjusting plate; the arc-shaped convex plate is arranged at the front part of the outer shell, and a screw hole is formed in the center of the arc-shaped convex plate and is screwed with a screw rod penetrating through the through hole from the rear part of the adjusting plate; two lifting components are symmetrically assembled at the upper end and the lower end of the outer shell. An anti-sinking part is assembled outside the lifting part; according to the technical scheme, the problems that in the prior art, a fusion cage is too thick to be installed in an intervertebral gap easily, and the fusion cage is too thin to facilitate an operation but not good in contact with a vertebral body are solved; the problems that the thickness of the fusion cage is changed and the treatment effect of a patient is reduced due to the fact that a screw slip condition cannot be locked when adjustment is carried out through a screw rod are solved.

Description

Technical Field

[0001] The utility model discloses an expandable intervertebral fusion cage, which relates to the technical field of medical devices, and in particular to an expandable intervertebral fusion cage. Background Art

[0002] The intervertebral fusion device consists of an intervertebral fusion device and its accessory screws. The material is Ti6Al4V titanium alloy and is packaged non-sterile. The product is suitable for spinal intervertebral fusion.

[0003] Intervertebral fusion cages help improve intervertebral fusion and are a necessary supplement to intervertebral fusion surgery. Kidney-shaped intervertebral fusion cages imitate the kidney-shaped anatomical structure of the vertebrae, which is more in line with the biomechanics of the spine. They have a larger bony contact area with the upper and lower vertebrae, effectively dispersing stress and improving the fusion rate.

[0004] Existing intervertebral fusion cages generally suffer from the inability to adapt well to changes in intervertebral height. If the cage is too thick, it will be difficult to fit into the intervertebral space during surgery. If the cage is too thin, while it is easy to install during surgery, it will not provide good contact with the upper and lower vertebrae. While existing intervertebral fusion cages are generally adjustable, this is usually done through a screw. If the screw is not locked, it is prone to thread slippage after prolonged use, causing the thickness of the cage to change without permission, reducing the patient's treatment effect.

[0005] In view of the problems existing in the above-mentioned prior art, it is very necessary to research and design a new expandable intervertebral fusion cage to overcome the problems existing in the prior art. Summary of the Invention

[0006] Based on the technical problems of the above-mentioned prior art, the fusion device is too thick to be easily installed in the intervertebral space, and too thin, although convenient for surgery, has poor contact with the vertebral body. Moreover, the adjustment by the screw cannot be locked, resulting in thread slippage, which causes the thickness of the fusion device to change and reduces the patient's treatment effect. The present invention mainly uses the screw to drive the arc-shaped convex plate and the adjustment plate to move relative to each other, pushing the lifting component to drive the anti-sinking component to expand the fusion device, thereby achieving the connection between the fusion device and the vertebral body. The occlusal teeth cooperate with the tooth grooves, and the tooth lines cooperate with the vertebral body to prevent the screw from slipping and the fusion device from changing its thickness without permission.

[0007] The technical means adopted by this utility model are as follows:

[0008] An expandable intervertebral fusion device comprises: an outer shell, an arc-shaped convex plate, an adjustment plate, a screw, a lifting component and an anti-sinking component;

[0009] Furthermore, the adjustment plate is arranged inside the outer shell, and a through hole is provided inside the adjustment plate for the screw to pass through;

[0010] Furthermore, an arc-shaped convex plate is mounted on the front of the outer shell, and a screw hole is provided at the center thereof, which is screwed to a screw rod passing through the through hole at the rear of the adjustment plate;

[0011] Furthermore, two lifting components are symmetrically mounted on the upper and lower ends of the outer shell;

[0012] Furthermore, the exterior of the lifting component is equipped with an anti-sinking component;

[0013] Furthermore, the knob screw drives the arc-shaped convex plate to move backward through the thread, and the lifting component is supported by the embedded plate at the rear end of the arc-shaped convex plate, the first wedge block at the front end of the adjustment plate, and the second wedge block on the lifting component, and then the anti-sinking component is used to prevent the fusion device from being displaced and sinking.

[0014] Furthermore, the outer shell is a rectangular shell structure with the front end and upper and lower ends open;

[0015] Furthermore, a through hole for the screw to pass through is opened in the middle of the rear end of the outer shell.

[0016] Furthermore, the arc-shaped convex plate further comprises: a limiting sliding groove, an embedded plate and an engaging tooth;

[0017] Furthermore, a limiting sliding groove is provided at the upper and lower ends of the rear side of the arc-shaped convex plate;

[0018] Furthermore, the two embedded plates are movably mounted on the right side of the arc-shaped convex plate through two limiting sliding grooves, and can slide up and down in the limiting sliding grooves;

[0019] Furthermore, the inner sides of the two embedded plates facing each other are provided with engaging teeth for use with the lifting component;

[0020] Furthermore, the overall adjustment plate is a plate-like structure with a certain thickness, and two pairs of first wedge-shaped blocks are symmetrically arranged at the front and rear parts of the upper and lower ends of the adjustment plate.

[0021] Furthermore, there are two sets of lifting components, which are symmetrically installed at the upper and lower ends of the outer shell; the two sets of lifting components include: a lifting plate, a second wedge block, an embedding groove and a tooth groove;

[0022] Furthermore, the lifting plate is a plate-shaped structure, and a second wedge-shaped block is provided on each of the front and rear parts of the side opposite to the adjustment plate;

[0023] Furthermore, the second wedge block abuts against the inclined surface of the first wedge block, and the width of the lifting plate adjusted outward is related to the contact area between the inclined surfaces of the first wedge block and the second wedge block;

[0024] Furthermore, the front end of the second wedge-shaped block is provided with an embedding groove for inserting the embedding plate;

[0025] Furthermore, a tooth groove for use with the engaging teeth is provided on the inner wall of the embedding groove.

[0026] Furthermore, the main body of the anti-sinking component is a dustproof plate with a plate-like structure;

[0027] Furthermore, the dustproof plate is arranged on the outer surface of the lifting plate, and the rear end thereof is movably mounted on the lifting plate in the form of a shaft connection;

[0028] Furthermore, the front end of the dustproof plate is embedded in the embedding groove;

[0029] Furthermore, the inclination angle of the dustproof plate is related to the width of the second wedge-shaped block adjusted outward;

[0030] Furthermore, the front end of the dustproof plate contacts the rear end of the embedded plate.

[0031] Furthermore, the outer surface of the dustproof plate is provided with tooth patterns;

[0032] Furthermore, the tooth pattern is a hook-shaped structure tilted backward.

[0033] The working principle of this utility model is:

[0034] When in use, first rotate the screw, use the arc-shaped convex plate as a reference, move the adjusting plate to the left, the first wedge block contacts the second wedge block, the second wedge block and the first wedge block cooperate to lift the anti-sinking plate, use the adjusting plate as a reference, and move the arc-shaped convex plate to the right. When the arc-shaped convex plate moves to the right, the embedded plate will gradually penetrate deeper into the groove, and then be locked by the engagement of the bite teeth and the tooth grooves to prevent the screw from slipping after long-term use. When the embedded plate penetrates deeply into the groove, it will contact the left end of the anti-sinking plate and make the anti-sinking plate convex. The surface of the anti-sinking plate is also provided with tooth patterns. The raised anti-sinking plate can prevent the device from displacement or sinking after long-term use.

[0035] Compared with the prior art, the utility model has the following advantages:

[0036] 1. The expandable intervertebral fusion device provided by the present invention has the ability to adjust the thickness of the intervertebral fusion device according to the patient's individual condition by installing a curved convex plate, an embedding plate, an engaging tooth, an adjustment plate, a first wedge block, a screw, a lifting plate, a second wedge block, an embedding groove, a tooth groove, and other devices. At the same time, the adjusted intervertebral fusion device can be locked to prevent the screw from slipping and the intervertebral fusion device from changing its thickness without permission.

[0037] 2. The expandable intervertebral fusion device provided by the present invention is equipped with an embedding plate, a lifting plate, a second wedge block, an embedding groove, an anti-sinking plate, a tooth pattern and other devices, so that when the device is adjusted, the anti-sinking plate can be raised from the surface of the lifting plate, and cooperate with the tooth pattern on the surface of the anti-sinking plate to prevent the device from being displaced or sinking.

[0038] In summary, the technical solution of the present invention solves the problem in the prior art that the fusion device is too thick to be easily installed in the intervertebral space, and is too thin, which is convenient for surgery but has poor contact with the vertebral body; and the device cannot be locked by adjusting the screw, resulting in thread slippage, causing the thickness of the fusion device to change and reducing the patient's treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0041] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0042] Figure 3 This is a schematic diagram of the structure of the arc-shaped convex plate of the utility model;

[0043] Figure 4 This is a structural diagram of the lifting component of the utility model in an unadjusted state;

[0044] Figure 5 This is a schematic diagram of the structure of the lifting component of the utility model after adjustment;

[0045] Figure 6 For this utility model Figure 5 A magnified schematic diagram of part A.

[0046] In the figure: 1. outer shell; 2. arc-shaped convex plate; 21. screw hole; 22. limiting slide groove; 23. embedded plate; 24. engaging teeth; 3. adjustment plate; 31. first wedge block; 4. screw; 5. lifting component; 51. lifting plate; 52. second wedge block; 53. embedded groove; 54. tooth groove; 6. anti-sinking component; 61. anti-sinking plate; 62. tooth pattern. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention 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.

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] 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 invention. 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technology, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0051] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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 their position 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.

[0053] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0054] like Figure 1-6 As shown, the utility model provides an adjustable intervertebral fusion device, including an outer shell 1, an adjustment plate 3 is movably installed inside the outer shell 1, a screw 4 is movably installed inside the outer shell 1, an arc-shaped convex plate 2 is movably installed on the front side of the outer shell 1, a screw hole 21 is opened in the middle of the rear side of the arc-shaped convex plate 2, the screw 4 passes through the adjustment plate 3, and the front end of the screw 4 is movably installed in the screw hole 21, a group of embedded plates 23 are movably installed on the upper and lower ends of the rear side of the arc-shaped convex plate 2, a group of lifting components 5 are respectively provided at the upper and lower ends of the outer shell 1, and the two groups of lifting components 5 are symmetrical. The lifting components 5 include a lifting plate 51 movably installed on the surface of the outer shell 1, and a second wedge block 52 is fixedly installed on the side of the lifting plate 51 close to the adjustment plate 3;

[0055] The upper and lower ends of the rear side of the arc-shaped protruding plate 2 are respectively provided with a group of limiting slide grooves 22. The two groups of embedded plates 23 are movably installed on the rear side of the arc-shaped protruding plate 2 through the two groups of limiting slide grooves 22, and the embedded plates 23 can move up and down through the limiting slide grooves 22. The opposite surfaces of the two groups of embedded plates 23 are fixedly installed with engaging teeth 24. The interior of the second wedge block 52 is provided with an embedding groove 53, and the embedded plate 23 is inserted into the embedding groove 53. The inner wall of the embedding groove 53 is provided with a tooth groove 54 that can be engaged with the embedded plate 23. The upper and lower end surfaces of the adjusting plate 3 are fixedly installed with a first wedge block 31. The first wedge block 31 abuts against the inclined surface of the second wedge block 52. The width of the two groups of lifting plates 51 that can be adjusted outward is related to the contact area of ​​the inclined surface of the first wedge block 31 and the second wedge block 52. The width of the two groups of lifting plates 51 that can be adjusted outward is limited by the range of up and down movement of the embedded plate 23.

[0056] By adopting the above technical solution, the height of the lifting plate 51 can be adjusted by rotating the screw 4 when in use, and the screw 4 is rotated clockwise so that the front end of the screw 4 is screwed into the screw hole 21. At this time, the front end of the screw 4 will drive the adjusting plate 3 to move forward while extending into the screw hole 21. When the adjusting plate 3 moves, the first wedge block 31 moves accordingly, and the inclined surface of the first wedge block 31 contacts the inclined surface of the second wedge block 52 while moving, and pushes the lifting plate 51, so that the two groups of lifting plates 51 are lifted from the surface of the outer shell 1 to achieve the purpose of adjustment; with the arc-shaped convex plate 2 as a reference, screw the screw 4, the adjusting plate 3 moves forward accordingly, with the adjusting plate 3 as a reference, screw the screw 4, the arc-shaped convex plate 2 moves backward, and the arc-shaped convex plate 2 moves backward while making the embedded plate 2 3 is inserted into the embedding groove 53 provided in the second wedge-shaped block 52, and the embedding plate 23 is equipped with an engaging tooth 24. A tooth groove 54 is provided in the embedding groove 53, and the engaging tooth 24 can be inserted into the tooth groove 54. Therefore, when the embedding plate 23 penetrates into the tooth groove 54, it will be stuck in the embedding groove 53 by the engaging tooth 24. At this time, the screw rod 4 can continue to be screwed forward to continue to increase the height of the lifting plate 51. At the same time, the embedding plate 23 will penetrate deeper into the embedding groove 53 and be engaged with the tooth groove 54 by the engaging tooth 24. After being engaged, the screw rod 4 cannot be rotated in the reverse direction. Through the above structural design, the height of the lifting plate 51 can only be adjusted higher, and cannot be adjusted higher and then lowered. In this way, the height of the lifting plate 51 can be limited, which prevents the screw rod 4 from slipping and causing the lifting plate 51 to be lowered without permission.

[0057] like Figures 2 to 6As shown, the surface of the lifting plate 51 is provided with an anti-sinking component 6, and the anti-sinking component 6 includes an anti-sinking plate 61 movably mounted on the surface of the lifting plate 51, and the surface of the anti-sinking plate 61 is provided with teeth 62. The rear end of the anti-sinking plate 61 is movably mounted on the surface of the lifting plate 51 through an axis, and the front end of the anti-sinking plate 61 is embedded in the embedding groove 53 opened inside the second wedge block 52. The teeth 62 on the surface of the anti-sinking plate 61 are in the shape of a barb, and the inclination angle of the anti-sinking plate 61 is related to the width of the second wedge block 52 adjusted outward. The embedding plate 23 is inserted into the embedding groove 53 and can contact the front end of the anti-sinking plate 61.

[0058] By adopting the above technical solution, an anti-sinking plate 61 is also installed on the surface of the lifting plate 51. When the height of the lifting plate 51 is adjusted, the embedded plate 23 will continue to be inserted into the embedded groove 53, and the front end of the anti-sinking plate 61 is located in the embedded groove 53. Therefore, when the embedded plate 23 is inserted into the embedded groove 53, it will contact the anti-sinking plate 61, thereby lifting the anti-sinking plate 61. The more the embedded plate 23 extends into the embedded groove 53, the greater the inclination angle of the anti-sinking plate 61. However, even when the lifting plate 51 is adjusted to the highest point, the anti-sinking plate 61 will not be too tilted. The anti-sinking plate 61 only slightly protrudes from the surface of the lifting plate 51. Through the design of the above structure, the device can also make the anti-sinking plate 61 protrude from the surface of the lifting plate 51 when adjusting, and cooperate with the tooth pattern 62 on the surface of the anti-sinking plate 61 to prevent the equipment from displacement and sinking.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An expandable intervertebral fusion cage, characterized by: The expandable intervertebral fusion device comprises: an outer shell (1), an arc-shaped convex plate (2), an adjustment plate (3), a screw (4), a lifting component (5) and an anti-sinking component (6); The adjustment plate (3) is arranged inside the outer shell (1), and is provided with a through hole that passes through the front and back for the screw (4) to pass through; The arc-shaped convex plate (2) is mounted on the front of the outer shell (1), and a screw hole (21) is provided at the center thereof, which is screwed to the screw rod (4) passing through the through hole at the rear of the adjustment plate (3); Two lifting components (5) are symmetrically mounted at the upper and lower ends of the outer shell (1); The exterior of the lifting component (5) is equipped with an anti-sinking component (6); The screw rod (4) described in the knob drives the arc-shaped convex plate (2) to move backward through the thread, and the lifting component (5) is supported by the embedded plate (23) at the rear end of the arc-shaped convex plate (2) and the first wedge block (31) at the front end of the adjustment plate (3) and the second wedge block (52) on the lifting component (5), and then the anti-sinking component (6) is used to prevent the fusion device from being displaced or sinking.

2. The expandable intervertebral fusion cage according to claim 1, characterized in that: The outer shell (1) is a rectangular shell structure with open front ends and upper and lower ends; A through hole for the screw rod (4) to pass through is provided in the middle of the rear end of the outer shell (1).

3. The expandable intervertebral fusion cage according to claim 1, characterized in that: The arc-shaped convex plate (2) further comprises: a limiting slide groove (22), an embedded plate (23) and an engaging tooth (24); A limiting sliding groove (22) is provided at the upper and lower ends of the rear side of the arc-shaped convex plate (2); The two embedded plates (23) are movably mounted on the right side of the arc-shaped convex plate (2) through two limiting slide grooves (22), and can slide up and down in the limiting slide grooves (22); The two embedded plates (23) are provided with engaging teeth (24) on the opposite inner sides thereof for use with the lifting component (5).

4. The expandable intervertebral fusion cage according to claim 1, characterized in that: The regulating plate (3) is a plate-shaped structure having a certain thickness as a whole, and two pairs of first wedge-shaped blocks (31) are symmetrically arranged at the front and rear parts of the upper and lower ends of the regulating plate (3).

5. The expandable intervertebral fusion cage according to claim 1, characterized in that: The lifting components (5) are in two sets, symmetrically mounted on the upper and lower ends of the outer shell (1); the two sets of lifting components (5) each include: a lifting plate (51), a second wedge block (52), an embedding groove (53) and a tooth groove (54); The lifting plate (51) is a plate-shaped structure as a whole, and a second wedge block (52) is provided on the front and rear parts of the side opposite to the adjustment plate (3); The second wedge block (52) is against the inclined surface of the first wedge block (31), and the width of the lifting plate (51) adjusted outward is related to the contact area of ​​the inclined surface of the first wedge block (31) and the second wedge block (52); The front end of the second wedge-shaped block (52) is provided with an embedding groove (53) for inserting the embedding plate (23); The inner wall of the embedding groove (53) is provided with a tooth groove (54) for use with the engaging teeth (24).

6. The expandable intervertebral fusion cage according to claim 1, characterized in that: The main body of the anti-sinking component (6) is a dustproof plate (61) with a plate-like structure; The dustproof plate (61) is arranged on the outer surface of the lifting plate (51), and its rear end is movably mounted on the lifting plate (51) in the form of a shaft connection; The front end of the dustproof plate (61) is embedded in the embedding groove (53); The inclination angle of the dustproof plate (61) is related to the width of the second wedge-shaped block (52) adjusted outward; The front end of the dustproof plate (61) contacts the rear end of the embedded plate (23).

7. The expandable intervertebral fusion cage according to claim 6, characterized in that: The outer surface of the dustproof plate (61) is provided with tooth patterns (62); The tooth pattern (62) is a hook-shaped structure that is tilted backward.

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