Intervertebral fusion cage

Abstract

The present application relates to a kind of intervertebral fusion cage prostheses, which includes a main body and a plurality of fitting mechanisms;The main body is composed of a metal base, a porous support structure and a plurality of sliding grooves;The plurality of fitting mechanisms are independent of each other, and each fitting mechanism is composed of a fitting plate, an extension rod, a pin shaft, an elastic device and a rotating shaft;When the intervertebral fusion cage is used, the plurality of independent fitting mechanisms use the main body as the base and use the elastic device to lift the extension rod, so that the fitting plate can be attached to the host bone lamina.The fitting mechanism and the main body are connected by a shaft pin during the fitting process, and the fitting mechanism can rotate and slide in the sliding rail to adjust its position, thereby achieving a better fitting effect.In this way, the connection area is increased, stress concentration is avoided, and the effects of preventing the prosthesis from sinking and the intervertebral space from collapsing are achieved.

Description

Technical Field

[0001] This invention relates to a prosthesis, and more particularly to an interbody fusion device prosthesis. Background Technology

[0002] The spine, as the "axial skeleton" of the human body, bears the weight of the head and torso, and participates in the formation of the protective skeleton of the thoracic, abdominal, and pelvic cavities. It is the core structure for maintaining posture, transmitting biomechanics, and facilitating movement. The spine is composed of multiple vertebrae connected by intervertebral discs, ligaments, and facet joints. Among them, the intervertebral discs, located between adjacent vertebrae, undertake important physiological functions such as buffering vibrations, distributing loads, maintaining intervertebral disc height, and ensuring relative movement between segments. They are one of the most critical flexible units in the spinal biomechanical system.

[0003] When intervertebral discs are damaged or lose function due to degenerative changes, trauma, tumors, or congenital developmental abnormalities, they often lead to spinal disorders such as disc herniation, vertebral slippage, spinal stenosis, and segmental instability. These conditions can result in serious consequences such as chronic low back and leg pain, radicular pain, and even paralysis, severely impacting patients' quality of life and ability to work. Intervertebral fusion is a classic surgical procedure for treating these spinal disorders. It involves removing the diseased intervertebral disc, implanting an intervertebral fusion device, and using bone grafts to achieve permanent bony fusion of the affected segment. This achieves the therapeutic goals of stabilizing the spine, relieving nerve compression, and alleviating pain, and is widely used in spinal surgery.

[0004] As the core implant in interbody fusion surgery, the performance of the interbody fusion cage directly determines the short-term efficacy and long-term prognosis of the procedure. Specifically, during and in the early postoperative period, the interbody fusion cage needs to provide immediate mechanical support to the affected segment, restore and maintain the intervertebral disc height and the physiological curvature of the spine, and prevent implant displacement, loosening, or dislocation. In the mid- to long-term postoperative period, it needs to work synergistically with the vertebral endplate and bone graft material to promote new bone ingrowth and ultimately achieve bony fusion of the affected segment. Therefore, an ideal interbody fusion cage should have a structural morphology that fits well with the vertebral endplate to simultaneously meet the dual clinical requirements of early stable support and long-term bony fusion.

[0005] However, existing interbody fusion cages still have significant shortcomings in their structural design, making it difficult to achieve good fit with the vertebral endplates. On the one hand, the human vertebral endplates themselves have complex three-dimensional anatomical curvature and individual differences, while the connecting surfaces of traditional interbody fusion cages usually adopt regular geometric structures such as planes, wedges, or simple convex arcs. These are standardized and generic shapes, unable to be personalized to match the endplate curvature of different patients and different segments. After implantation, there is a common problem of morphological mismatch between the fusion cage and the endplate. On the other hand, due to the aforementioned poor fit, the actual effective connection area between the fusion cage and the endplate is significantly smaller than its nominal area, resulting in high local stress concentration. This easily leads to complications such as endplate perforation, fusion cage subsidence, and intervertebral space collapse. At the same time, insufficient endplate fit also directly reduces the effective connection area of ​​the bone fusion interface, hindering bone ingrowth and creeping replacement processes, delaying or even hindering the smooth achievement of postoperative bone fusion, and directly affecting the long-term efficacy of the surgery.

[0006] In summary, traditional interbody fusion cages generally face the prominent problem of poor fit with the vertebral endplates, which leads to endplate damage, cage subsidence, and insufficient bone fusion interface, severely restricting the clinical efficacy and safety of interbody fusion surgery. Therefore, improvements in structural design are urgently needed. Summary of the Invention

[0007] The main purpose of this invention is to develop an interbody fusion device prosthesis to solve the problem of insufficient stability caused by poor fit of existing interbody fusion device prostheses.

[0008] To achieve the above objectives, the present invention provides an interbody fusion prosthesis, specifically comprising: a main body and a fitting mechanism.

[0009] The main body includes a metal base, a porous support structure, and a sliding groove. The two ends of the metal base are fixedly equipped with porous support structures to promote bone ingrowth for better long-term stability. The sliding groove consists of two curved parallel tracks to provide space for the rotation and sliding of the fitting mechanism. The two parallel tracks are fixedly connected by a limiting plate to limit the displacement of the fitting mechanism when it moves. The bottom of the parallel tracks is close to the porous support structure, and the two ends are fixedly connected to the metal base to transmit stress.

[0010] The fitting mechanism includes: a fitting plate, a telescopic rod, a pin, an elastic device, and a rotating shaft. The fitting plate is connected to the host vertebral plate to fit and support the host spine; the telescopic rod has a hollow internal structure with a first spring groove for the elastic device to control the extension and retraction of the telescopic rod; one end of the pin is fixed to the fitting plate and the other end is fixed to the telescopic rod, allowing the fitting plate and the telescopic rod to be rotatably connected to adjust the fitting angle; the top of the rotating shaft has a second spring groove to limit the rebound direction of the elastic device, and the bottom of the rotating shaft is fixedly connected to a base. A rolling shaft is located at the center of the base and is connected to a sliding groove to control the rotation and movement of the fitting mechanism; one end of the elastic device is placed in the first spring groove, and the other end is placed in the second spring groove to adjust the extension and retraction of the telescopic rod.

[0011] Furthermore, the center of the bonding plate is provided with a slot for fixing the shape of the interbody fusion device.

[0012] Furthermore, the interbody fusion device also includes a controller, which consists of control plates, control rings, and a handle. Multiple control plates form a fixed curvature and are used to insert into the aforementioned slots, thereby reducing the curvature of the interbody fusion device and facilitating placement. A control ring is provided below the control plate for fixing the control plate; the upper end of the handle is fixedly connected to the inner surface of the control ring for convenient gripping and use of the controller.

[0013] Furthermore, the telescopic pole consists of an upper pole body and a lower pole body to enhance its rigidity.

[0014] Furthermore, the upper rod has a first limiting block on its lower side and the lower rod has a second limiting block on its upper side to limit the travel of the upper rod when the telescopic rod extends or retracts; the lower rod has a third limiting block on its lower side and the second spring groove has a fourth limiting block on its upper side to limit the travel of the lower rod when the telescopic rod extends or retracts.

[0015] According to the technical solution of this invention, an intervertebral fusion device includes: a main body and an apposition mechanism. The main body includes: a metal base, a porous support structure, and a sliding groove; the two ends of the metal base are fixedly provided with the porous support structure to promote bone ingrowth for better long-term stability; the sliding groove consists of two curved parallel tracks to provide space for the rotation and sliding of the apposition mechanism, the two parallel tracks are fixedly connected by a limiting plate to limit the displacement of the apposition mechanism during movement, the bottom of the parallel tracks is pressed against the porous support structure, and the two ends are fixedly connected to the metal base to transmit stress. The apposition mechanism includes: an apposition plate, a telescopic rod, a pin, an elastic device, and a rotating shaft. The fitting plate is connected to the host vertebral lamina to fit and support the host spine. The telescopic rod has a hollow internal structure with a first spring groove for the elastic device to control the extension and retraction of the telescopic rod. One end of the pin is fixed to the fitting plate and the other end to the telescopic rod, allowing the fitting plate and telescopic rod to be rotatably connected to adjust the fitting angle. The top of the rotating shaft has a second spring groove to limit the rebound direction of the elastic device. The bottom of the rotating shaft is fixedly connected to a base, and a rolling shaft is located at the center of the base. The rolling shaft is connected to a slide groove to control the rotation and movement of the fitting mechanism. One end of the elastic device is placed in the first spring groove, and the other end is placed in the second spring groove to adjust the extension and retraction of the telescopic rod. Multiple independent fitting mechanisms use the main body as a base and the elastic device to lift the telescopic rod so that the fitting plate can fit against the host vertebral lamina. During the fitting process, due to the pin connection between the fitting mechanism and the main body, the fitting mechanism can rotate and slide in the slide rail to adjust its position, thereby achieving a better fitting effect. This increases the connection area, avoids stress concentration, and prevents prosthesis subsidence and intervertebral space collapse.

[0016] Therefore, this invention solves the problem of insufficient fit between the interbody fusion device and the patient's spine after implantation by using a multi-unit adaptive fitting module, and provides more stable support performance. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of the interbody fusion device is shown. Figure 2 The front view, bottom view, and a partial enlarged view of the front view of the main body of the interbody fusion device are shown. Figure 3 An exploded view of the fitting mechanism is shown; Figure 4 A side view of the rotating shaft is shown; Figure 5 A cross-sectional view of the telescopic rod and the pivot is shown; Figure 6The controller is shown in three side views. The above-mentioned figures include the following reference numerals: 10, main body; 101, metal base; 102, porous support structure; 103, slide groove; 1031, limiting plate; 20, bonding mechanism; 201, bonding plate; 2011, slot; 202, telescopic rod; 2021, upper rod body; 2022, lower rod body; 2023, first limiting block; 2024, second limiting block; 2025, third limiting block; 203, pin; 204, rotating shaft; 2041, second spring groove; 2042, base; 2043, rolling shaft; 2044, fourth limiting block; 205, elastic device; 30, controller; 301, control plate; 302, control ring; 303, handle. Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0021] like Figure 1-6 As shown: An interbody fusion device includes a main body 10, an apposition mechanism 20, and a controller 30. The main body 10 includes a metal base 101, a porous support structure 102, and a sliding groove 103. The two ends of the metal base 101 are fixedly provided with the porous support structure 102 to promote bone ingrowth for better long-term stability. The sliding groove 103 consists of two curved parallel tracks to provide space for the rotation and sliding of the apposition mechanism 20. The two parallel tracks are fixedly connected by a limiting plate 1031 to limit the displacement of the apposition mechanism 20 during movement. The bottom of the parallel tracks is pressed against the porous support structure 102, and the two ends of the parallel tracks are fixedly connected to the metal base 101 to transmit stress.

[0022] The fitting mechanism 20 includes: a fitting plate 201, a telescopic rod 202, a pin 203, an elastic device 205, and a rotating shaft 204. The fitting plate 201 is connected to the host vertebral plate for fitting and supporting the host spine. A slot 2011 is provided in the center of the fitting plate 201 for fixing the shape of the intervertebral fusion device. The telescopic rod 202 has a hollow internal structure with a first spring groove for the elastic device 205 to control the extension and retraction of the telescopic rod 202. The telescopic rod 202 consists of an upper rod body 2021 and a lower rod body 2022 to enhance its rigidity. A first limiting block 2023 is located on the lower side of the upper rod body 2021, and a second limiting block 2024 is located on the upper side of the lower rod body to restrict extension. The upper rod 2021 extends during retraction, and the lower rod 2022 has a third limiting block 2025 on its lower side. One end of the pin 203 is fixed to the bonding plate 201, and the other end is fixed to the telescopic rod 202, allowing the bonding plate 201 and the telescopic rod 202 to be rotatably connected to adjust the bonding angle. The top of the rotating shaft 204 is provided with a second spring groove 2041 to limit the rebound direction of the elastic device 205. The upper side of the second spring groove 2041 has a fourth limiting block 2044, which, together with the third limiting block 2025, limits the travel of the lower rod 2022 during retraction. The bottom of the rotating shaft 204 is fixedly connected to a base 2042, and a rolling shaft 2043 is provided at the center of the base 2042. The rolling shaft 2043 is connected to the slide groove 103 to control the rotation and movement of the bonding mechanism 20. The controller 30 includes a control plate 301, a control ring 302, and a handle 303. Multiple control plates 301 form a fixed curvature and are inserted into the aforementioned multiple slots 2011 to reduce the curvature of the interbody fusion device. A control ring 302 is located below each control plate 301 to secure it. The upper end of the handle 303 is fixedly connected to the inner surface of the control ring 302 for easy gripping and use of the controller 30.

[0023] like Figure 1 An intervertebral fusion device includes a main body 10 and multiple fitting mechanisms 20, wherein the multiple fitting devices 20 independently achieve a multi-unit fitting effect.

[0024] like Figure 2 The main body 10 includes a metal base 101, a porous support structure 102, and a sliding groove 103. The two ends of the metal base 101 are fixedly provided with the porous support structure 102 to promote bone ingrowth and achieve better long-term stability. The sliding groove 103 consists of two curved parallel tracks to provide space for the rotation and sliding of the fitting mechanism 20. The two parallel tracks are fixedly connected by a limiting plate 1031 to limit the displacement of the fitting mechanism 20 when it moves. The bottom of the parallel tracks is close to the porous support structure 102, and the two ends of the parallel tracks are fixedly connected to the metal base 101 to transmit stress.

[0025] like Figure 3-4 The fitting mechanism 20 includes: a fitting plate 201, a telescopic rod 202, a pin 203, an elastic device 205, and a rotating shaft 204. The fitting plate 201 is connected to the host vertebral plate for fitting and supporting the host spine. The fitting plate 201 has a slot 2011 in the center for fixing the shape of the interbody fusion device, preventing the fitting plate 201 from tilting when placed, and effectively compressing the volume of the interbody fusion device when not in use. The telescopic rod 202 has a hollow internal structure and a first spring groove for the elastic device 205 to control the extension and retraction of the telescopic rod 202. One end of the pin 203 is fixed to the bonding plate 201 and the other end is fixed to the telescopic rod 202, so that the bonding plate 201 and the telescopic rod 202 can be rotatably connected to adjust the bonding angle; the top of the rotating shaft 204 is provided with a second spring groove 2041 to limit the rebound direction of the elastic device 205; the bottom of the rotating shaft 204 is fixedly connected to the base 2042, and the center of the base 2042 is provided with a rolling shaft 2043, which is connected to the slide groove 103 to control the rotation and movement of the bonding mechanism 20; like Figure 5 The telescopic rod 202 is composed of an upper rod body 2021 and a lower rod body 2022 to enhance the rigidity of the telescopic rod 202. The lower side of the upper rod body 2021 has a first limiting block 2023, and the upper side of the lower rod body has a second limiting block 2024 to limit the stroke of the upper rod body 2021 during telescopic movement. The lower side of the lower rod body 2022 has a third limiting block 2025. The upper side of the second spring groove 2041 has a fourth limiting block 2044 to limit the stroke of the lower rod body 2022 together with the third limiting block 2025 during telescopic movement.

[0026] like Figure 6 The controller 30 includes a control plate 301, a control ring 302, and a handle 303. Multiple control plates 301 form a fixed curvature and are used to insert into the aforementioned multiple slots 2011, thereby reducing the curvature of the interbody fusion device. A control ring 302 is disposed below the control plate 301 to fix the control plate 301; the upper end of the handle 303 is fixedly connected to the inner surface of the control ring 302 for convenient gripping and use of the controller 30.

[0027] The specific technical effects of using this invention are as follows: When the interbody fusion device is implanted, it is in a non-working state. Under the control of the controller, its overall shape is fixed, its volume is small, and it is easy to place, which aligns with the trend of minimally invasive orthopedic surgery. After implantation, the controller is removed, and the compressed elastic device rebounds, causing the telescopic rod to extend, which in turn moves the abutment plate, connecting it to the patient's spine. At this time, under the action of the elastic device's rebound force, the rotating shaft on the sliding groove can make a small displacement, causing the entire abutment mechanism to change position to obtain a better abutment angle; and the abutment plate, connected to the telescopic rod by a pin, can be angled. When the interbody fusion device enters the working state, external pressure is transmitted through the abutment mechanism to the sliding groove and the porous support structure. Through the synergistic support of the porous support structure and the metal base, the interbody fusion device is ensured to work stably under pressure; and the porous support structure has good bone ingrowth performance, providing better long-term stability.

[0028] In summary, this invention improves upon conventional interbody fusion devices by dividing the connection surface into multiple fitting mechanism units and utilizing structures such as grooves, rotating shafts, elastic mechanisms, and pins to achieve an adaptive fitting scheme. This allows the interbody fusion device to adapt to the needs of different patients, different intervertebral regions, different intervertebral space heights, and different anatomical morphologies, achieving a better fitting effect and long-term stability.

[0029] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An interbody fusion device, characterized in that, include: The main body (10) includes: a metal base (101), with a perforated support structure (102) fixedly disposed at both ends of the metal base (101); multiple sliding grooves (103) are also disposed at both ends of the main body (10), each sliding groove (103) is composed of two curved parallel tracks, the two parallel tracks are fixedly connected by a limiting plate (1031); the bottom of the parallel tracks is attached to the perforated support structure (102), and the two ends of the parallel tracks are fixedly connected to the metal base (101); The fitting mechanism (20) is provided in multiple ways, and includes: a fitting plate (201), the top of which is connected to the host vertebral plate; a telescopic rod (202), the interior of which is a hollow structure with a first spring groove; and a pin (203), one end of which is fixedly connected to the bottom of the fitting plate (201) and the other end is fixed to the telescopic rod (202), so that the fitting plate (201) and the telescopic rod are connected to each other. (202) Rotatably connected; a rotating shaft (204), the top of which is provided with a second spring groove (2041), the bottom of which is fixedly connected with a base (2042), the center of which is provided with a rolling shaft (2043), the rolling shaft (2043) being located in a sliding groove (103); an elastic device (205), one end of which is placed in a first spring groove, and the other end of which is placed in a second spring groove (2041).

2. The interbody fusion device according to claim 1, characterized in that, The center of the bonding plate (201) is also provided with a slot (2011).

3. The interbody fusion device according to claim 2, characterized in that, The intervertebral fusion device also includes a controller (30), which includes: a control plate (301), the plurality of control plates (301) forming a fixed curvature, the control plate (301) being inserted into the slot (2011) of the aforementioned bonding plate (201), and a control ring (302) being provided below the control plate (301); and a handle (303), the upper end of the handle (303) being fixedly connected to the inner surface of the control ring (302).

4. The interbody fusion device according to claim 1, characterized in that, The telescopic rod (202) consists of an upper rod body (2021) and a lower rod body (2022).

5. The interbody fusion device according to claim 4, characterized in that, The bottom of the upper rod (2021) is provided with a first limiting block (2023); the top of the lower rod (2022) is provided with a second limiting block (2024); the bottom of the lower rod (2022) is provided with a third limiting block (2025); and the upper side of the second spring groove (2041) is provided with a fourth limiting block (2044).

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