Anti-falling intervertebral fusion cage

Abstract

The utility model relates to the intervertebral fusion cage technical field discloses a kind of anti-drop intervertebral fusion cage. To solve the stress shielding problem in the actual use of conventional intervertebral fusion cage in prior art, and porosity is lower, fusion rate is low after operation;Lack of bone integration channel, the technical problem of low fusion rate after operation. The utility model includes support frame, at least two bone graft channels are arranged on support frame, to fill bone induction material and promote bone growth;Support frame end is provided with clamping groove;Support frame includes edge support part, and edge support part is connected by porous structure between;The porosity of porous structure gradually changes from small to large by the direction close to far from vertebral body, and presents gradient distribution. The utility model effectively balances the problem of insufficient porous structure strength, and the problem of too large solid structure quality, and the porosity of porous structure is large, has more bone integration channel, is conducive to the growth of bone cell, and can effectively improve bone growth rate.

Description

Technical Field

[0001] This utility model relates to the field of interbody fusion device technology, and in particular to an anti-dislodgement interbody fusion device. Background Technology

[0002] Early spinal fusion techniques involved subperiosteal muscle dissection and autologous bone implantation, without internal fixation. This resulted in a high complication rate, numerous postoperative complications, pseudoarthrosis, and prolonged recovery time. Since the development of anterior cervical decompression and fusion, cervical fusion techniques have been widely promoted and developed. After years of development, spinal fusion is now widely used to treat various spinal diseases, including congenital spinal diseases, deformities, degenerative diseases, benign and malignant tumors, and spinal fractures, and is one of the most commonly used surgical techniques in spinal surgery. Interbody fusion, through the implantation of a fusion cage, can effectively address cervical and lumbar intervertebral space narrowing and degenerative diseases. Its design concept is: to implant a fixed interbody fusion cage into the existing intervertebral space, which, through support, restores the intervertebral space height, widens the intervertebral foramen, relieves nerve compression symptoms, enhances segmental stability, and prevents secondary degenerative changes in adjacent segments.

[0003] Interbody fusion cages are widely used implants in spinal surgery, primarily used to restore intervertebral disc height, maintain spinal stability, and promote bone fusion. The cage is fixed between the vertebral bodies, restoring intervertebral disc height through its rigid structure, distributing spinal load, and preventing vertebral collapse. Furthermore, the cage directly contacts the adjacent lamina above and below, providing immediate stability. Traditional interbody fusion cages are mostly solid structures or cage-like structures with simple openings. Surface roughness is increased through sandblasting, acid etching, and other surface treatments. More advanced techniques incorporate bone graft windows on the surface, inducing osteoblast proliferation through the insertion of autologous bone tissue. For example, the Ray-TFC (titanium alloy fusion cage) has a honeycomb-like porous structure, but in practice, it suffers from stress shielding issues and has low porosity, resulting in low postoperative fusion rates. The Synthes Prodisc (Peek fusion cage) is a hollow PEEK cage filled with bone graft material; however, in practice, the dense PEEK surface lacks bone integration channels, leading to low postoperative fusion rates. In addition, the materials used in the existing technology, whether they are titanium alloy-based metal materials or PEEK-based polymer materials, have a significant difference in elastic modulus compared to human cancellous bone, which causes stress to concentrate at both ends of the fusion device and accelerates the degeneration of adjacent segments.

[0004] Chinese patent document 202411902286.2 discloses an interbody fusion device, which includes: an installation body, including a first prosthesis frame and a second prosthesis frame, the first prosthesis frame being located above the second prosthesis frame, both the first and second prosthesis frames having vertebral body connection portions, and the bottom end of the first prosthesis frame and the top end of the second prosthesis frame being in a horizontally upper limit fit.

[0005] However, the above-mentioned solutions have at least the following technical problems during implementation: traditional interbody fusion devices suffer from stress shielding in actual use, and have low porosity, resulting in low postoperative fusion rates; they also lack osseointegration channels, further contributing to low postoperative fusion rates. Therefore, there is an urgent need to develop an anti-dislodgement interbody fusion device. Summary of the Invention

[0006] In view of the above technical problems, this disclosure provides an anti-dislodgement interbody fusion device, which solves the problems of stress shielding, low porosity, low postoperative fusion rate, lack of osseointegration channel, and low postoperative fusion rate of traditional interbody fusion devices in actual use.

[0007] According to one aspect of this disclosure, an anti-dislodgement interbody fusion device is provided, comprising a support frame, wherein at least two bone graft channels are provided on the support frame for filling with bone-inducing material to promote bone ingrowth; a clamping groove is provided at the end of the support frame; the support frame includes edge support portions, which are connected to each other via a porous structure; the pores of the porous structure gradually increase in size from the direction of approach to the vertebral body, and are distributed in a gradient.

[0008] In some embodiments of this disclosure, the porous structure has pores of 500-1000 micrometers to facilitate bone tissue growth.

[0009] In some embodiments of this disclosure, the pore shape of the porous structure is a regular dodecahedral structure.

[0010] In some embodiments of this disclosure, the bone graft channels are arranged in an interleaved manner.

[0011] In some embodiments of this disclosure, the intervertebral fusion device is cylindrical, rectangular, wedge-shaped, or trapezoidal.

[0012] In some embodiments of this disclosure, the intervertebral fusion device is provided with a wing on its side to stabilize the position of the intervertebral fusion device in the intervertebral space, and a fixing hole is provided on the wing to fix the adjacent spinous process.

[0013] In some embodiments of this disclosure, an anti-slip structure is also provided on the side wing that fits against the side adjacent to the spinous process.

[0014] In some embodiments of this disclosure, the upper and lower surfaces of the intervertebral fusion device are provided with anti-slip structures to stabilize the position of the intervertebral fusion device in the intervertebral space.

[0015] In some embodiments of this disclosure, the interbody fusion device is an expandable interbody fusion device, which includes two states: an U-shaped state in a compressed state and an I-shaped state in an expanded state. The expandable interbody fusion device includes an upper support plate and a lower support plate, with at least one end of the upper support plate and the lower support plate fixedly connected. The expandable interbody fusion device is made of nickel-titanium shape memory alloy material.

[0016] The beneficial effects of this utility model are as follows: The combination of a porous structure and a solid frame effectively balances the shortcomings of insufficient strength in porous structures and excessive mass in solid structures. The high porosity of the porous structure provides more osseointegration channels, facilitating osteoblast ingrowth and effectively improving the ingrowth rate. The edge support can withstand significant mechanical loads, maintaining intervertebral height and stability. The porous structure connects the edge support and provides channels for bone tissue growth, allowing osteoblasts to pass through and fill, achieving osseointegration and enhancing the connection strength between the fusion cage and the vertebral body. A hollow bone graft window is internally designed, allowing for the implantation of autologous bone or other implantable materials. Structurally, this reduces the depth of the porous structure, overcoming the difficulty of osteoblast ingrowth. At least two bone graft channels facilitate the filling of osteoinductive materials, guiding osteoblast growth and bone tissue formation, enabling better fusion of the intervertebral fusion cage with adjacent vertebral bodies, improving fusion effectiveness and stability, and accelerating patient recovery.

[0017] The inclusion of clamping slots facilitates surgical manipulation, providing clamping positions for surgical instruments. This allows surgeons to operate more stably and accurately during intervertebral fusion implantation or adjustment, reducing surgical difficulty and risks, and ensuring a smooth procedure. Smaller pores near the vertebral body provide initial stability, preventing excessive bone growth and early loosening. Larger pores further away from the vertebral body promote deeper bone growth and angiogenesis, creating favorable conditions for long-term stable fusion and promoting natural, orderly bone growth and repair. The pore size range meets the physiological requirements of bone growth, ensuring smooth migration and proliferation of bone cells while providing sufficient space for new bone tissue. It also facilitates the exchange of nutrients and metabolic waste, promoting the formation and development of healthy bone tissue. The dodecahedral structure provides excellent spatial stability and load-bearing capacity, evenly distributing stress and reducing stress shielding. Its multi-faceted connectivity allows bone tissue to grow and penetrate from multiple directions, forming a three-dimensional bony connection and improving the firmness and reliability of the fusion. The staggered bone graft channels expand the contact area between the bone-inducing material and bone tissue, making the bone growth path richer and more three-dimensional, thereby enhancing the effect and strength of osseointegration and improving the connection stability and fusion quality between the intervertebral fusion cage and the vertebral body. Different shapes such as cylindrical, rectangular, wedge-shaped, and trapezoidal can adapt to the anatomical characteristics, lesion locations, and surgical approach requirements of different patients. Surgeons can choose the most suitable shape according to the specific situation to achieve precise implantation and improve the effectiveness and adaptability of the surgery. The lateral wings increase the contact area with the surrounding tissues of the intervertebral space, preventing cage displacement; fixation holes are used to fix adjacent spinous processes, further stabilizing the position; the anti-slip structure can engage with surrounding bone tissue, providing additional gripping force to ensure that the intervertebral fusion cage is firmly placed in the intervertebral space during and after surgery, guaranteeing the fusion effect. The U-shape in the compressed state makes it easy for doctors to implant into the intervertebral space, reducing surgical trauma; the I-shape in the expanded state can adapt to the height of the intervertebral space, providing good support and restoring the physiological curvature and stability of the spine; the nickel-titanium shape memory alloy material has the characteristics of good biocompatibility, shape memory effect and superelasticity, which can restore its shape with changes in body temperature, ensuring long-term stable operation in the body, effectively supporting the intervertebral space and promoting fusion. Attached Figure Description

[0018] Figure 1 A schematic diagram of a non-dislodgement interbody fusion device; Figure 2 Another structural diagram of an anti-dislodgement interbody fusion device; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this application; Figure 4 This is a schematic diagram of the structure of Embodiment 3 of this application; Figure 5 This is a schematic diagram of another state structure in Embodiment 3 of this application; Figure 6This is a schematic diagram of the structure of Embodiment 4 of this application; Figure 1 To clearly demonstrate the structure of this application, it is shown from another angle, from which the structural shape contained in this application can be clearly seen. However, it should be noted that during installation, the anti-slip structure is only located on the top and bottom surfaces, while the sides are smooth to avoid damaging the patient's nerves. The components in the diagram are named as follows: 1. Support frame; 2. Bone graft channel; 3. Clamping groove; 4. Edge support; 5. Porous structure; 6. Side wing; 7. Fixing hole; 8. Anti-slip structure; 9. Upper support plate; 10. Lower support plate; 11. Trapezoidal. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Example 1

[0020] This example discloses an anti-dislodgement interbody fusion device. See [link to relevant documentation]. Figures 1 to 6 ; The support frame 1 includes at least two bone graft channels 2, which are filled with bone-inducing material to promote bone ingrowth. The support frame 1 has a clamping groove 3 at its end. The support frame 1 includes edge support parts 4, which are connected by a porous structure 5. The pores of the porous structure 5 gradually increase in size from the direction of approach to the vertebral body, and are distributed in a gradient.

[0021] The porous structure 5 has pores of 500-1000 micrometers to facilitate the growth of bone tissue.

[0022] The pore shape of porous structure 5 is a regular dodecahedral structure.

[0023] The bone graft channels 2 are arranged in an interlaced manner.

[0024] Intervertebral fusion cages can be cylindrical, rectangular, wedge-shaped, or trapezoidal.

[0025] The upper and lower surfaces of the intervertebral fusion device are equipped with anti-slip structures to stabilize the position of the intervertebral fusion device in the intervertebral space.

[0026] During the procedure, firstly, an interbody fusion cage of appropriate shape (cylindrical, rectangular, wedge-shaped, or trapezoidal) is selected based on the patient's specific condition and surgical requirements. During implantation, the clamping groove 3 provides a clamping position for surgical instruments, enabling the surgeon to operate the interbody fusion cage stably and accurately. The bone graft channels 2 on the support frame 1 are staggered to facilitate the filling of bone-inducing materials. These materials guide bone cell growth and bone tissue formation within the bone graft channels 2, promoting better fusion of the interbody fusion cage with adjacent vertebral bodies. Simultaneously, the edge support portions 4 of the support frame 1 are connected by a porous structure 5. The pores of the porous structure 5 are gradient-distributed; the pores are smaller near the vertebral body, providing initial stability and preventing bone tissue loosening in the early stages of growth; the pores are larger further away from the vertebral body, facilitating deeper bone tissue growth and blood vessel formation, creating favorable conditions for long-term stable fusion. The pore size is 500-1000 micrometers, meeting the physiological requirements of bone tissue growth, ensuring smooth migration and proliferation of bone cells, and facilitating the exchange of nutrients and metabolic waste. The porous structure, with its dodecahedral shape, possesses excellent spatial stability and load-bearing capacity. It can evenly distribute stress, reduce stress shielding, and its multi-faceted connectivity facilitates bone tissue growth and penetration from multiple directions, forming a three-dimensional bony connection. As bone tissue continuously grows and repairs within the bone graft channel 2 and the porous structure 5, the intervertebral fusion device gradually forms a firm bony connection with adjacent vertebral bodies, achieving stable intervertebral fusion, restoring spinal stability and function, alleviating patient symptoms, and improving the patient's quality of life.

[0027] This embodiment applies to the lumbar spine. It takes into account the significant load and range of motion the lumbar spine needs to withstand. This application not only effectively supports the functional needs of the spine but also significantly reduces the risk of postoperative displacement, providing patients with a more stable and lasting therapeutic effect. Example 2

[0028] The principle of this example is the same as that of Example 1, the specific difference being: see [link / reference needed] Figure 3 The intervertebral fusion device has a lateral wing 6 on its side to stabilize the position of the intervertebral fusion device in the intervertebral space, and a fixation hole 7 is provided on the lateral wing to fix the adjacent spinous process.

[0029] The side wing 6 is also fitted with an anti-slip structure 8 that fits closely to the side of the spinous process.

[0030] During the procedure, the side wings 6 on the sides of the intervertebral fusion cage increase the contact area with the surrounding tissues of the intervertebral space, preventing displacement of the fusion cage. The fixation holes 7 on the side wings 6 can be used to fix the adjacent spinous process, further stabilizing its position. Simultaneously, the anti-slip structures 8 on the side wings 6, which conform to the adjacent spinous process and the upper and lower surfaces of the intervertebral fusion cage, can engage with surrounding bone tissue, providing additional gripping force to ensure the intervertebral fusion cage is firmly placed in the intervertebral space during and after the procedure, effectively preventing displacement and ensuring the fusion effect.

[0031] This embodiment applies to the lumbar spine. It takes into account the significant load and range of motion the lumbar spine needs to withstand. This application not only effectively supports the functional needs of the spine but also significantly reduces the risk of postoperative displacement, providing patients with a more stable and lasting therapeutic effect. Example 3

[0032] The principle of this example is the same as that of Example 1, the specific difference being: see [link / reference needed] Figure 4 , 5 The interbody fusion device is an expandable interbody fusion device, which includes two states: a U-shaped state in compression and a [-shaped state in expansion. The expandable interbody fusion device includes an upper support plate 9 and a lower support plate 10. The upper support plate and the lower support plate are fixedly connected at least at one end. The expandable interbody fusion device is made of nickel-titanium shape memory alloy material.

[0033] During the procedure, the expandable intervertebral fusion cage, initially in a compressed U-shape, facilitates insertion into the intervertebral space. After implantation, utilizing the shape memory properties of a nickel-titanium shape memory alloy, the expandable intervertebral fusion cage gradually returns to its expanded U-shape under body temperature. The upper support plate 9 and the lower support plate 10 are fixedly connected at at least one end, allowing the expandable cage to adapt to the height of the intervertebral space, providing excellent support and restoring the physiological curvature and stability of the spine.

[0034] This embodiment applies to the lumbar spine. It takes into account the significant load and range of motion the lumbar spine needs to withstand. This application not only effectively supports the functional needs of the spine but also significantly reduces the risk of postoperative displacement, providing patients with a more stable and lasting therapeutic effect. Example 4

[0035] The principle of this example is the same as that of Example 1, the specific difference being: see [link / reference needed] Figure 6 The interbody fusion cage is trapezoidal. In this embodiment, this shape is better suited to the cervical spine anatomy, allows for a wider range of motion, and provides stable support. Example 5

[0036] The principle of this example is the same as that of Example 1, but the specific differences are as follows: The sides of the interbody fusion cage have a smooth transition surface. The purpose of this smooth transition surface is to ensure the protection of surrounding nerves and improve the surgical prognosis.

[0037] Although some preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0038] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A non-dislodgement interbody fusion device, characterized in that: The support frame includes a support frame with anti-slip structures on its upper and lower surfaces to stabilize the position of the intervertebral fusion device in the intervertebral space. The support frame has at least two bone graft channels on its sides, which are filled with bone-inducing material to promote bone ingrowth. The support frame has a clamping groove at its end. The support frame includes edge support portions, which are connected by a porous structure. The pores of the porous structure gradually increase in size from the direction of approach to the vertebral body, exhibiting a gradient distribution.

2. The anti-dislodgement interbody fusion device as described in claim 1, characterized in that: The porous structure has pores of 500-1000 micrometers to facilitate bone tissue growth.

3. The anti-dislodgement interbody fusion device as described in claim 1, characterized in that: The porous structure has a dodecahedral pore shape.

4. The anti-dislodgement interbody fusion device as described in claim 1, characterized in that: The bone graft channels are arranged in an interlaced manner.

5. The anti-dislodgement interbody fusion device as described in claim 1, characterized in that: The intervertebral fusion device is cylindrical, rectangular, wedge-shaped, or trapezoidal.

6. The anti-dislodgement interbody fusion device as described in claim 1, characterized in that: The intervertebral fusion device is provided with a wing on its side to stabilize the position of the intervertebral fusion device in the intervertebral space, and a fixation hole is provided on the wing to fix the adjacent spinous process.

7. The anti-dislodgement interbody fusion device as described in claim 6, characterized in that: The side wing is also provided with an anti-slip structure that fits against the side adjacent to the spinous process.

8. The anti-dislodgement interbody fusion device as described in claim 1, characterized in that: The interbody fusion device is an expandable interbody fusion device, which includes two states: an U-shaped state in a compressed state and an I-shaped state in an expanded state. The expandable interbody fusion device includes an upper support plate and a lower support plate, with at least one end of the upper support plate and the lower support plate fixedly connected. The expandable interbody fusion device is made of nickel-titanium shape memory alloy material.

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