Full-porous cervical vertebra fusion cage

Abstract

The utility model relates to the technical field of medical instruments, and discloses a full-porous cervical vertebra fusion cage which comprises a machining area and a porous area. The machining area is provided with a threaded hole for leading in a surgical instrument; the porous area comprises an upper surface, a lower surface, a front surface, a rear surface and two side surfaces; and the upper surface and the lower surface are provided with anti-skid surfaces. The threaded hole in the machining area is used for being matched with a surgical instrument matched with the threaded hole, and surgical implantation is facilitated. The porous area provides more growth space for cells, adhesion, migration, proliferation and differentiation of the cells are facilitated, and finally the bone ingrowth effect is achieved. The full-porous cervical vertebra fusion cage has the mechanical property matched with the human body structure and good biocompatibility, can form a tight bonding interface with the human body tissue, improves the combination stability of the fusion cage and the human body tissue, has the mechanical property matched with the human body tissue, and can be applied to clinical treatment of cervical degenerative diseases.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a fully porous cervical fusion device. Background Technology

[0002] Cervical degenerative diseases refer to degenerative changes in the intervertebral discs and surrounding tissues of the cervical spine, leading to irritation and compression of nerves, spinal cord, and blood vessels around the cervical joints, and consequently cervical instability. This condition not only affects the patient's physical health but also reduces their quality of life and work.

[0003] Cervical intervertebral fusion cages are suitable for intervertebral fusion surgery for conditions such as cervical disc degeneration, disc dysfunction, intervertebral foramen stenosis caused by joint hypertrophy, segmental instability, and spinal deformities. Traditional cervical intervertebral fusion cages are made of PEEK material with a large central bone graft window filled with autologous or artificial bone fragments. After implantation, bone cells tend to grow within this window, failing to achieve proper osseointegration with the cage itself, leading to complications such as cage slippage in the later stages. Existing 3D-printed fusion cages largely borrow from the original PEEK design, but they also suffer from limited osseointegration sites. Furthermore, existing cervical fusion cages exhibit issues such as subsidence or displacement, stress shielding, and poor compatibility, and cannot comprehensively consider factors such as the patient's bone condition, age, and the extent of bone graft availability to create a suitable treatment plan. Utility Model Content

[0004] The purpose of this invention is to provide a fully porous cervical fusion device. The design of this device provides more space for bone cells to grow into the implanted cervical spine, which is beneficial for cell adhesion, migration, and proliferation, ultimately achieving bone fusion. At the same time, the larger endplate contact surface effectively reduces the probability of post-implantation subsidence or displacement, stress shielding, etc., increasing the fusion success rate.

[0005] The technical solution of this utility model is as follows: a fully porous cervical fusion device, comprising a machined area and a porous area; the machined area is provided with threaded holes for inserting surgical instruments; the porous area includes an upper surface, a lower surface, a front surface, a rear surface, and two side surfaces; the upper and lower surfaces are provided with anti-slip surfaces. The threaded holes in the machined area can cooperate with surgical instruments, facilitating the implantation of the fusion device; the porous area provides space for cell growth; the upper and lower surfaces are anti-slip surfaces to maintain the stability of the fusion device after implantation.

[0006] Furthermore, the porous region is composed of arch-like structural units that are interconnected. This interconnected porous structure facilitates cell ingrowth and proliferation.

[0007] Furthermore, the anti-slip surface of the upper surface is formed by an upward protrusion of an arch-shaped structural unit; the anti-slip surface of the lower surface is formed by a downward protrusion of an arch-shaped structural unit. The two anti-slip surfaces formed by the upward and downward extensions of the arch-shaped structural unit not only increase the friction between the fusion device and the upper and lower vertebrae at the implantation site, significantly improving the stability of the fusion device, but also provide more contact points with the upper and lower vertebrae at the implantation site due to the protruding arch-shaped structure, which is beneficial for the migration and proliferation of bone tissue cells from the vertebrae to the fusion device.

[0008] Furthermore, the upper and lower surfaces of the porous region are inclined surfaces; there is an angle between the inclined surfaces and the horizontal plane, and the angle ranges from -15° to 15°.

[0009] Furthermore, the edge of the inclined surface has an arc-shaped structure. The arc-shaped structure can adapt to the physiological curvature of the vertebral body.

[0010] Furthermore, the connections between the two sides and the two adjacent rear sides of the fully porous cervical fusion device feature an arc-shaped transition. This arc-shaped transition design ensures a smooth overall profile of the fully porous cervical fusion device, significantly reducing the incidence of trauma to surrounding tissues during surgical implantation.

[0011] Furthermore, the porosity of the porous region is 40% to 95%, and the pore size is 300 to 1000 μm.

[0012] Furthermore, the machining area and the porous area are printed as a single unit.

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] This novel porous cervical fusion cage conforms to the patient's endplate via its upper and lower surfaces. The machined area features an instrument insertion end with threaded holes for clamping the cage, facilitating its insertion. The non-slip design of the upper and lower surfaces effectively improves post-implantation stability. The raised, arched structure provides numerous contact points with the vertebral bodies above and below the implantation site, promoting bone cell migration and proliferation. The porous area provides more adhesion sites for cells, facilitating cell proliferation, migration, differentiation, and accelerating bone ingrowth and fusion. The curved transitions at the junctions of the two sides, the rear, and the front of the porous cervical fusion cage result in a smooth overall profile, significantly reducing trauma to surrounding tissues during implantation. The equivalent elastic modulus of the overall structural unit of the fully porous cervical fusion device provided by this utility model is similar to that of human bone (the elastic modulus of cancellous bone is 0.5-3 GPa, and the elastic modulus of cortical bone is 12-18 GPa), which can avoid stress shielding effect and is conducive to the formation of new bone. Attached Figure Description

[0015] Figure 1 This is a first-view structural schematic diagram of the fully porous cervical fusion device of this utility model.

[0016] Figure 2 This is a second-view structural diagram of the fully porous cervical fusion device of this utility model.

[0017] Figure 3 This is a front view of the fully porous cervical fusion device of this utility model.

[0018] Figure 4 This is a side view of the fully porous cervical fusion device of this utility model.

[0019] Figure 5 This is a schematic diagram of the arch-like structural unit of this utility model.

[0020] The fully porous cervical fusion device includes: 1. Machining area; 2. Porous area; 3. Threaded hole; 4. Upper surface; 5. Lower surface; 6. Side 1; 7. Side 2; 8. Rear; 9. Arch-like structural unit; 10. Upper anti-slip surface; 11. Lower anti-slip surface; 12. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0022] Example

[0023] like Figures 1-4 As shown, this embodiment provides a fully porous cervical fusion device, including a machined area 2 and a porous area 3; the machined area 2 has threaded holes 4 for inserting surgical instruments; the porous area 3 includes an upper surface 5 and a lower surface 6; the upper surface 5 and the lower surface 6 are anti-slip surfaces. The threaded holes 4 in the machined area can cooperate with surgical instruments, facilitating the implantation of the fusion device; the porous area 2 provides space for cell growth; the anti-slip surfaces of the upper surface 5 and the lower surface 6 maintain the stability of the fusion device after implantation.

[0024] like Figures 1-5 As shown, the porous region 3 is composed of arch-like structural units 10, which are interconnected. This interconnected porous structure facilitates cell ingrowth and proliferation. The arch-like structural units 10 extend upwards to the upper surface 5, forming an upper anti-slip surface 11; they also extend downwards to the lower surface 6, forming a lower anti-slip surface 12. These two anti-slip surfaces not only increase the friction between the fusion device and the upper and lower vertebral bodies at the implantation site, significantly improving the stability of the fusion device, but also allow the raised arch-like structures to fully contact the upper and lower vertebral bodies at the implantation site, which is beneficial for the migration and proliferation of bone tissue cells into the fusion device.

[0025] like Figure 3 , 4 As shown, the upper and lower surfaces (5 and 6) of the fully porous cervical fusion device 1 are inclined surfaces, forming an angle with the horizontal plane, ranging from -15° to 15°. The edges of the inclined surfaces have an arc-shaped structure to conform to the physiological curvature of the vertebral body. The connections between the two sides (7 and 8) and the two adjacent surfaces (9) of the fully porous cervical fusion device 1 are made with an arc-shaped transition. The arc-shaped transition design makes the overall contour of the fully porous cervical fusion device smooth, significantly reducing the incidence of trauma to the patient's surrounding tissues during surgical implantation. The porosity of the porous region 3 is 40%–95%, and the pore size is 300–1000 μm. The machined region 2 and the porous region 3 are integrally printed.

[0026] The fully porous cervical fusion device of this invention has an equivalent elastic modulus of overall structural unit that is close to that of human bone (the elastic modulus of cancellous bone is 0.5-3 GPa, and the elastic modulus of cortical bone is 12-18 GPa). Therefore, it can avoid stress shielding effect, which is conducive to the formation of new bone and accelerates the fusion rate.

[0027] This invention relates to a fully porous cervical fusion device, manufactured using precision 3D printing technology, comprising a machined area and a porous area. The porous area is interconnected, providing more adhesion sites for cells and promoting cell adhesion, proliferation, migration, differentiation, and accelerating bone ingrowth and fusion. The anti-slip surfaces on the upper and lower surfaces of the porous area provide friction between the fully porous cervical fusion device and the surrounding bone tissue, effectively enhancing the stability of the fusion device and preventing displacement or dislodgement after implantation, ensuring the durability and safety of the treatment effect. This fusion device exhibits high strength characteristics, and its mechanical properties are highly similar to those of human bone, ensuring stability and compatibility after implantation. Furthermore, it possesses excellent fatigue resistance, corrosion resistance, and superior biocompatibility, effectively reducing the risk of postoperative rejection.

[0028] As described above, the present invention can be well implemented. The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made in accordance with the content of the present invention are covered by the scope of protection claimed by the claims of the present invention.

Claims

1. A fully porous cervical fusion device, characterized in that, It includes a machined area and a porous area; the machined area is provided with a threaded hole for inserting surgical instruments; the porous area includes an upper surface, a lower surface, a front surface, a rear surface, and two side surfaces; the upper surface and the lower surface are provided with anti-slip surfaces.

2. The fully porous cervical fusion device as described in claim 1, characterized in that, The porous region is composed of arch-like structural units, which are interconnected.

3. The fully porous cervical fusion device as described in claim 1, characterized in that, The anti-slip surface of the upper surface is formed by an upward protrusion of an arch-shaped structural unit; the anti-slip surface of the lower surface is formed by a downward protrusion of an arch-shaped structural unit.

4. The fully porous cervical fusion device as described in claim 1, characterized in that, The upper and lower surfaces of the porous region are inclined surfaces; there is an angle between the inclined surfaces and the horizontal plane, and the angle ranges from -15° to 15°.

5. The fully porous cervical fusion device as described in claim 4, characterized in that, The edge of the inclined surface has an arc-shaped structure.

6. The fully porous cervical fusion device as described in claim 1, characterized in that, The connection between the two sides and the two adjacent rear sides of the fully porous cervical fusion device adopts an arc-shaped transition.

7. The fully porous cervical fusion device as described in claim 1, characterized in that, The porosity of the porous region is 40% to 95%, and the pore size is 300 to 1000 μm.

8. The fully porous cervical fusion device as described in claim 1, characterized in that, The machining area and the porous area are printed as a single unit.

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