Self-adaptive interbody fusion cage
By adopting a combined structure of support and elastic members in the intervertebral fusion device, the height adjustment and stability improvement of the adaptive intervertebral fusion device are achieved, and the problems of poor adaptability and insufficient stability of the intervertebral fusion device in the prior art are solved.
Patent Information
- Application Number
- CN202421678776.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-15
AI Technical Summary
The height fixation of existing intervertebral fusion devices is difficult to adapt to the changes in the vertebral space caused by the intervertebral height of different individuals and human activities, which can easily lead to the displacement or disengagement of the fusion device.
An adaptive intervertebral fusion device is designed, adopting a combined structure of support and elastic members. The support can extend or retract under the elastic force of the elastic members to ensure that it is always fitted with the vertebral end plate.
The adaptive intervertebral fusion device is automatically adjusted when the human body is active, avoiding the displacement or disengagement of the fusion device, and at the same time adapting to the intervertebral height of different individuals, reducing the time and difficulty of the operation.
Smart Images
Figure CN222929887U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to an adaptive intervertebral fusion device. Background Art
[0002] With the aggravation of population aging and the change of people's daily work habits, the problem of lumbar disc herniation has become very common, seriously affecting people's work and life. If effective reduction is not carried out, the condition is likely to worsen. At present, for clinical symptoms such as lumbar disc herniation, intervertebral fusion surgery is often used for treatment, that is, the herniated intervertebral disc is removed, and then an intervertebral fusion device is implanted between the vertebral bodies to induce the adjacent vertebral bodies to fuse together.
[0003] In practical applications, the upper and lower surfaces of the intervertebral fusion device are in contact with the vertebral end plates of the adjacent vertebral bodies. The existing intervertebral fusion device has a fixed self-height, and an intervertebral fusion device of one specification can only adapt to one intervertebral height, and it is difficult to adapt to the specific vertebral bodies of each individual. It is rather troublesome to select a suitable specification of the fusion device during the operation. Moreover, due to the activities of the human body, the gap between the fusion device and the vertebral body will become larger or smaller. At this time, the intervertebral fusion device with a fixed height is difficult to adapt to the vertebral body gap changed due to human activities, and it is easy to cause the fusion device to shift or even protrude.
[0004] Therefore, there is an urgent need to propose an adaptive intervertebral fusion device to solve the above technical problems. Summary of the Utility Model
[0005] The purpose of the utility model is to provide an adaptive intervertebral fusion device, which can automatically adapt to the micro-movement generated between the vertebral bodies during human activities, avoid the phenomenon of the fusion device shifting or even protruding, and at the same time can adapt to different intervertebral heights of different individuals, reducing the operation time and difficulty.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] The utility model provides an adaptive intervertebral fusion device, including:
[0008] A main body having a first surface and a second surface arranged oppositely;
[0009] A support member disposed on the first surface and the second surface, and the support member can extend and retract relative to the first surface and the second surface;
[0010] An elastic member disposed on the main body, the support member is connected to the elastic member, and the elastic member has an elastic tendency to move the support member so that the support member always fits with the corresponding vertebral end plate.
[0011] In some embodiments, the number of the support members is plural, and the plural support members are arranged along the implantation direction of the main body on the first surface and the second surface, and the elastic members are arranged in one-to-one correspondence with the support members.
[0012] In some embodiments, a guiding arc surface and a stopping arc surface are arranged at one end of the support member close to the vertebral end plate, the guiding arc surface and the stopping arc surface are arranged in opposite directions along the implantation direction of the main body, and both are bent toward one side of the implantation direction of the main body.
[0013] In some embodiments, mounting holes are formed in the first surface and the second surface, the elastic members are arranged in the mounting holes, and part of the support members are arranged in the mounting holes and move along the axial direction of the mounting holes.
[0014] In some embodiments, a stopping structure is arranged between the support member and the mounting hole, and the stopping structure is used for stopping the support member on the moving path of the support member.
[0015] In some embodiments, the stopping structure includes a boss, a first step and a second step. A boss is arranged at one end of the support member close to the elastic member, and the boss protrudes from the outer surface of the main body of the support member; the mounting hole includes a first hole section, a second hole section and a third hole section which are communicated with each other, the second hole section is located between the first hole section and the third hole section, the aperture of the second hole section is larger than the apertures of the first hole section and the third hole section, a first step is formed between the second hole section and the first hole section, a second step is formed between the second hole section and the third hole section, and the boss can be stopped at the first step and the second step.
[0016] In some embodiments, bone grafting holes are formed in the main body, and the bone grafting holes penetrate through the first surface and the second surface.
[0017] In some embodiments, the plural support members are symmetrically arranged in the areas on the first surface and the second surface on opposite sides of the bone grafting hole.
[0018] In some embodiments, the main body includes a main body head and a main body tail, the first surface and the second surface are both connected between the main body head and the main body tail, and the main body head gradually converges toward a direction away from the main body tail.
[0019] In some embodiments, a clamping groove for clamping by a clamp is arranged on the main body tail.
[0020] The beneficial effects of the present utility model:
[0021] The self - adaptive intervertebral fusion device provided by the present utility model is provided with a support member and an elastic member that cooperate with each other. When the gap between the self - adaptive intervertebral fusion device and the vertebral body becomes larger, the support member extends outward under the elastic force of the elastic member, that is, extends in a direction away from the first surface and the second surface; when the gap between the self - adaptive intervertebral fusion device and the vertebral body becomes smaller, the support member retracts towards the direction close to the first surface and the second surface and compresses the elastic member. In this way, the support member can be in close contact with the adjacent two vertebral bodies in real time to automatically adapt to the micro - motion generated between the vertebral bodies during human activities, avoiding the phenomenon of fusion device displacement or even extrusion. At the same time, since the support member is movable, the height of the self - adaptive intervertebral fusion device has a certain range of variation, so that the self - adaptive intervertebral fusion device can adapt to different intervertebral heights of different individuals, with strong adaptability, which is beneficial to reducing the time and difficulty of selecting a suitable - sized fusion device during the operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the following - described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.
[0023] Figure 1 is a schematic diagram of the overall structure of the self - adaptive intervertebral fusion device provided by the embodiment of the present utility model;
[0024] Figure 2 is a front view of the self - adaptive intervertebral fusion device provided by the embodiment of the present utility model;
[0025] Figure 3 is a schematic diagram of the structure of the support member from one perspective provided by the embodiment of the present utility model;
[0026] Figure 4 is a schematic diagram of the structure of the support member from another perspective provided by the embodiment of the present utility model;
[0027] Figure 5 is a schematic diagram of the overall structure of the main body provided by the embodiment of the present utility model;
[0028] Figure 6 is a cross - sectional view of the internal structure of the main body provided by the embodiment of the present utility model;
[0029] Figure 7 is an assembly diagram of the support member and the elastic member located in the mounting hole provided by the embodiment of the present utility model.
[0030] In the figure:
[0031] 1. Main body; 11. First surface; 12. Second surface; 13. Mounting hole; 131. First hole section; 132. Second hole section; 133. Third hole section; 14. Bone grafting hole; 15. Main body head; 16. Main body tail; 161. Clamping groove;
[0032] 2. Support member; 21. Guide arc surface; 22. Stop arc surface;
[0033] 3. Elastic member;
[0034] 4. Stop structure; 41. Boss; 42. First step; 43. Second step. Specific embodiments
[0035] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0036] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.
[0037] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0038] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.
[0039] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged" and "connected" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0040] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.
[0041] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.
[0042] As Figures 1 to 7 shown, the adaptive intervertebral fusion device provided in this embodiment includes a main body 1, a support member 2 and an elastic member 3.
[0043] The main body 1 has a first surface 11 and a second surface 12 which are oppositely arranged. The support member 2 is arranged on the first surface 11 and the second surface 12, and the support member 2 can extend and retract relative to the first surface 11 and the second surface 12. The elastic member 3 is arranged on the main body 1, the support member 2 is connected to the elastic member 3, and the elastic member 3 has an elastic tendency to move the support member 2 so that the support member 2 always fits the corresponding vertebral endplate. That is: under the elastic force of the elastic member 3, the support member 2 can move relative to the first surface 11 and the second surface 12, and thus the height of the adaptive intervertebral fusion device has a certain height change range.
[0044] Specifically, as Figure 1 and Figure 2As shown, the first surface 11 and the second surface 12 are respectively the upper surface and the lower surface of the main body 1 in the height direction. After the adaptive intervertebral fusion device is implanted between two adjacent vertebrae, the first surface 11 and the support member 2 provided thereon face the vertebral end plate of the upper vertebra (not shown in the figure), and the second surface 12 and the support member 2 provided thereon face the vertebral end plate of the lower vertebra (not shown in the figure). The support member 2 moves under the action of the elastic member 3 and always fits against the corresponding vertebral end plate.
[0045] For the adaptive intervertebral fusion device provided in this embodiment, by providing the mutually cooperating support member 2 and elastic member 3, when the gap between the adaptive intervertebral fusion device and the vertebra becomes larger, the support member 2 extends outward under the elastic force of the elastic member 3, that is, extends in a direction away from the first surface 11 and the second surface 12; when the gap between the adaptive intervertebral fusion device and the vertebra becomes smaller, the support member 2 retracts towards the first surface 11 and the second surface 12 and compresses the elastic member 3. In this way, the support member 2 can always closely adhere to the two adjacent vertebrae in real time, so as to automatically adapt to the micro-movement generated between the vertebrae during human activities, and avoid the phenomenon of the fusion device shifting or even falling out. At the same time, since the support member 2 is movable, the height of the adaptive intervertebral fusion device has a certain range of variation, so that the adaptive intervertebral fusion device can adapt to different intervertebral heights of different individuals, with strong adaptability, which is beneficial to reducing the time and difficulty of selecting a suitable specification fusion device during the operation.
[0046] Among them, the elastic member 3 can be a coil spring, a spring sheet, etc., and no specific limitation is made here.
[0047] As Figure 1 shown, in some embodiments, the main body 1 includes a main body head 15 and a main body tail 16. The first surface 11 and the second surface 12 are both connected between the main body head 15 and the main body tail 16, and the main body head 15 gradually converges in a direction away from the main body tail 16.
[0048] The direction from the main body tail 16 to the main body head 15 is the implantation direction of the adaptive intervertebral fusion device.
[0049] By setting the main body head 15 to have a gradually converging structure in a direction away from the main body tail 16, it is convenient for the adaptive intervertebral fusion device to be inserted between two adjacent vertebrae.
[0050] Furthermore, as Figure 1 shown, the main body tail 16 is provided with a clamping groove 161 for clamping by a fixture. The setting of the clamping groove 161 facilitates the operation of the operator during the operation of implanting the adaptive intervertebral fusion device.
[0051] As Figure 1As shown, in some embodiments, the number of the supporting members 2 is plural, and the plural supporting members 2 are arranged along the implantation direction of the main body 1 on the first surface 11 and the second surface 12, and the elastic members 3 are arranged in one-to-one correspondence with the supporting members 2.
[0052] With such an arrangement, the plural supporting members 2 can form multi-point support for the vertebral endplate, effectively disperse the pressure on the vertebral endplate, and thus reduce the risk of vertebral endplate injury.
[0053] As Figure 1 shown, in some embodiments, the main body 1 is provided with bone grafting holes 14, and the bone grafting holes 14 penetrate through the first surface 11 and the second surface 12. The bone grafting holes 14 can facilitate the implantation of artificial bone or autologous bone, and further better enable the self-adaptive intervertebral fusion device to fuse.
[0054] Optionally, the bone grafting holes 14 are kidney-shaped holes.
[0055] Furthermore, the plural supporting members 2 are symmetrically arranged in the regions on the first surface 11 and the second surface 12 that are on the opposite sides of the bone grafting holes 14. Specifically, in this embodiment, along the width direction of the main body 1, one row of supporting members 2 is respectively arranged on the opposite sides of the bone grafting holes 14 and is symmetrically arranged, so that the overall force of the self-adaptive intervertebral fusion device is more balanced. However, it is not limited thereto, and the number of rows of the arrangement of the supporting members 2 can also be greater than two rows. For example, on the first surface 11, two rows or three rows of supporting members 2 are respectively arranged on the opposite sides of the bone grafting holes 14, and no specific limitation is made here.
[0056] As Figures 2 to 4 shown, in some embodiments, a guiding arc surface 21 and a stopping arc surface 22 are arranged at one end of the supporting member 2 close to the vertebral endplate. The guiding arc surface 21 and the stopping arc surface 22 are arranged in opposite directions along the implantation direction of the main body 1 and are both bent toward the side of the implantation direction of the main body 1.
[0057] By arranging the guiding arc surface 21, the shape of the arc surface can play a certain guiding role in the process of implanting the self-adaptive intervertebral fusion device between two adjacent vertebrae, and facilitate the self-adaptive intervertebral fusion device to be squeezed between two adjacent vertebrae. The arrangement of the stopping arc surface 22 can make the supporting member 2 stop on the vertebral endplate of the vertebra, prevent the self-adaptive intervertebral fusion device from withdrawing between two adjacent vertebrae in the opposite direction of the implantation direction, and is beneficial to improving the stability of the self-adaptive intervertebral fusion device after implantation.
[0058] As Figures 5 to 7As shown, in some embodiments, mounting holes 13 are formed in the first surface 11 and the second surface 12. The elastic member 3 is disposed in the mounting holes 13, and a part of the support member 2 is disposed in the mounting holes 13 and moves along the axial direction of the mounting holes 13. With such a setting, the elastic member 3 and a part of the support member 2 are located inside the mounting holes 13, which can not only improve the structural compactness, but also the mounting holes 13 play a certain limiting role in the movement of the support member 2, which is beneficial to avoiding the deviation of the support member 2 during the movement.
[0059] As Figure 7 shown, in some embodiments, a stop structure 4 is provided between the support member 2 and the mounting hole 13, and the stop structure 4 is used to stop the support member 2 on the movement path of the support member 2.
[0060] By providing the stop structure 4, the distance of the movement path of the support member 2 can be accurately limited to avoid the over-compression of the elastic member 3, thereby ensuring the normal operation of the elastic member 3.
[0061] As Figure 6 and Figure 7 shown, in some embodiments, the stop structure 4 includes a boss 41, a first step 42 and a second step 43. A boss 41 is provided at one end of the support member 2 close to the elastic member 3, and the boss 41 protrudes from the outer surface of the body of the support member 2; the mounting hole 13 includes a first hole section 131, a second hole section 132 and a third hole section 133 that are interconnected. The second hole section 132 is located between the first hole section 131 and the third hole section 133. The aperture of the second hole section 132 is larger than the apertures of the first hole section 131 and the third hole section 133. A first step 42 is formed between the second hole section 132 and the first hole section 131, and a second step 43 is formed between the second hole section 132 and the third hole section 133. The boss 41 can be stopped at the first step 42 and the second step 43.
[0062] Specifically, as Figure 7 shown, taking the support member 2 on the first surface 11 as an example for illustration, the first surface 11 is the upper surface of the main body 1. When the support member 2 extends in a direction away from the first surface 11, the top surface of the boss 41 can be stopped inside the first step 42. When the support member 2 retracts in a direction close to the first surface 11, the bottom surface of the boss 41 can be stopped inside the second step 43.
[0063] With such a setting, the structure of the stop structure 4 is simple and easy to be processed and formed, which is beneficial to improving the processing efficiency.
[0064] Of course, in other embodiments, the mounting hole 13 can also be set in a form with a consistent aperture, and a stop block or a stop boss is fixedly installed on the inner wall of the mounting hole 13. The boss 41 on the support member 2 can be stopped at the stop block or the stop boss on the inner wall of the mounting hole 13 during the movement of the support member 2.
[0065] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.
Claims
1. An adaptive intervertebral fusion cage, characterized in that: include: A main body (1) having a first surface (11) and a second surface (12) arranged opposite to each other; A support member (2) is arranged on the first surface (11) and the second surface (12), and the support member (2) can be extended and retracted relative to the first surface (11) and the second surface (12); An elastic member (3) is arranged on the main body (1), and the support member (2) is connected to the elastic member (3). The elastic member (3) has an elastic tendency to move the support member (2) so that the support member (2) always fits with the corresponding vertebral end plate.
2. The adaptive intervertebral fusion cage according to claim 1, characterized in that: The number of the support members (2) is multiple, and the multiple support members (2) are arranged on the first surface (11) and the second surface (12) along the implantation direction of the main body (1), and the elastic members (3) are arranged in a one-to-one correspondence with the support members (2).
3. The adaptive intervertebral fusion cage according to claim 2, characterized in that: A guide arc surface (21) and a stop arc surface (22) are provided at one end of the support member (2) close to the vertebral end plate; the guide arc surface (21) and the stop arc surface (22) are arranged opposite to each other along the implantation direction of the main body (1), and are both bent toward one side of the implantation direction of the main body (1).
4. The adaptive intervertebral fusion cage according to claim 2, characterized in that: The first surface (11) and the second surface (12) are provided with mounting holes (13), the elastic member (3) is arranged in the mounting hole (13), and the support member (2) is partially arranged in the mounting hole (13) and moves along the axial direction of the mounting hole (13).
5. The adaptive intervertebral fusion cage according to claim 4, characterized in that: A stop structure (4) is provided between the support member (2) and the mounting hole (13), and the stop structure (4) is used to stop the support member (2) on the moving path of the support member (2).
6. The adaptive intervertebral fusion cage according to claim 5, characterized in that: The stop structure (4) comprises a boss (41), a first step (42) and a second step (43); the boss (41) is arranged at one end of the support member (2) close to the elastic member (3); the boss (41) protrudes from the outer surface of the body of the support member (2); the mounting hole (13) comprises a first hole section (131), a second hole section (132) and a third hole section (133) which are interconnected; the second hole section (132) is located between the first hole section (131) and the third hole section (133); The second hole section (132) has a larger hole diameter than the first hole section (131) and the third hole section (133); the first step (42) is formed between the second hole section (132) and the first hole section (131); the second step (43) is formed between the second hole section (132) and the third hole section (133); and the boss (41) can be stopped at the first step (42) and the second step (43).
7. The adaptive intervertebral fusion cage according to any one of claims 2 to 6, characterized in that: The main body (1) is provided with a bone grafting hole (14), and the bone grafting hole (14) passes through the first surface (11) and the second surface (12).
8. The adaptive intervertebral fusion cage according to claim 7, characterized in that: The plurality of support members (2) are symmetrically arranged in the area where the first surface (11) and the second surface (12) are located on opposite sides of the bone grafting hole (14).
9. The adaptive intervertebral fusion cage according to claim 1, characterized in that: The main body (1) comprises a main body head (15) and a main body tail (16); the first surface (11) and the second surface (12) are both connected between the main body head (15) and the main body tail (16); and the main body head (15) gradually converges in a direction away from the main body tail (16).
10. The adaptive intervertebral fusion cage according to claim 9, characterized in that: The main body tail (16) is provided with a clamping groove (161) for clamping.