Full-porous thoracolumbar fusion cage

Abstract

The body structure of the full-porous thoracolumbar fusion cage is a porous octahedron, and the full-porous thoracolumbar fusion cage comprises an upper front end, a lower front end, a front end, a tail end, an upper contact surface, a lower contact surface and double side surfaces, the tail end is provided with an operation fixing hole and a clamping groove; and the upper contact surface and the lower contact surface are provided with connecting beams and convex tooth surfaces. The structural unit of the porous octahedron of the full-porous thoracolumbar fusion cage body is of an arch-imitating structure, more growth space can be provided for cells, and cell ingrowth is facilitated. The surgical fixing hole and the clamping groove can be used in cooperation with surgical instruments, and a reliable mechanical fixing structure is provided for the fusion cage. The upper convex tooth surface and the lower convex tooth surface can maintain the stability after the fusion cage is implanted. The full-porous thoracolumbar fusion cage can form a tight bonding interface with human tissues, the mechanical property of the full-porous thoracolumbar fusion cage is matched with that of the human tissues, and the full-porous thoracolumbar fusion cage can be applied to diseases such as thoracolumbar degenerative change and lumbar spinal stenosis.

Description

Technical Field

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

[0002] Degenerative spinal diseases are prevalent among middle-aged and elderly individuals. The main reason is that with increasing age, the spine undergoes physiological aging, leading to lesions in the anterior and posterior longitudinal ligaments and intervertebral discs, which in turn result in a series of conditions such as bone hyperplasia, ligamentum flavum thickening, and posterior disc protrusion. Degenerative spinal diseases are primarily divided into thoracic and lumbar spine disorders. Thoracic spine degenerative diseases mainly include ossification of the posterior longitudinal ligament, thoracic disc herniation, and calcification of the thoracic longitudinal ligament. Lumbar spine degenerative diseases include lumbar disc herniation, lumbar spinal stenosis, lumbar spondylolisthesis, and degenerative scoliosis. Thoracolumbar interbody fusion devices are medical devices used to treat thoracic and lumbar spine diseases. They primarily work by fixing the pedicles or fusing the thoracic and lumbar vertebrae, promoting intervertebral fusion, thereby reducing thoracic and lumbar spine pain, stabilizing the vertebrae, and restoring spinal function.

[0003] Currently available thoracolumbar fusion cages do not achieve good bone ingrowth after implantation, resulting in low postoperative fusion rates. Furthermore, existing cervical fusion cages still suffer from issues such as subsidence or displacement, stress shielding, and poor compatibility. They also fail to comprehensively consider factors such as the patient's bone condition, age, and the extent of bone graft availability to formulate an appropriate treatment plan. Utility Model Content

[0004] The purpose of this invention is to provide a fully porous thoracolumbar fusion device that can effectively solve the problems of low fusion rate, subsidence or displacement, stress shielding and poor matching that occur after the thoracolumbar fusion device is implanted in the body in the prior art, so as to achieve better cell ingrowth and bone bonding effects.

[0005] The technical solution of this utility model is as follows: a fully porous thoracolumbar fusion device, wherein the body of the fully porous thoracolumbar fusion device is a porous octahedron; the porous octahedron includes an upper front end, a lower front end, a front end, a tail end, an upper contact surface, a lower contact surface, and two side surfaces; the tail end is provided with a surgical fixation hole and a clamping groove; the upper and lower contact surfaces are provided with connecting beams and convex toothed surfaces. The porous octahedron body of the fully porous thoracolumbar fusion device provides more growth space for cells, which is conducive to cell ingrowth. The surgical fixation hole and clamping groove can be used in conjunction with surgical instruments to provide a reliable mechanical fixation structure for the fusion device. The convex toothed surfaces on the upper and lower contact surfaces can maintain the stability of the fusion device after implantation.

[0006] Furthermore, the angle between the upper front end and the upper contact surface is 93° to 150°; the angle between the lower front end and the lower contact surface is 93° to 150°. The design of the upper and lower front ends allows the fusion device to match the structure of the intervertebral disc implantation site, thereby making the fusion device fit more closely with the upper and lower endplates and increasing the contact area with the endplates.

[0007] Furthermore, the front end is a curved surface, connecting the upper front end, the lower front end, and both sides.

[0008] Furthermore, the porous octahedron is composed of interconnected arch-like structural units. The interconnected porous structure can promote cell adhesion, proliferation, migration, and differentiation, and accelerate bone ingrowth and osteosynthesis.

[0009] Furthermore, the clamping grooves are located at the connection between the two sides and the tail end, on both sides of the surgical fixation hole. The clamping grooves support the clamping operation of surgical instruments on the multi-porous thoracolumbar fusion cage, facilitating the implantation of the fusion cage.

[0010] Furthermore, any one of the sides of the clamping groove other than the side closest to the tail-end fixing hole is a through-type arch-shaped structural unit. The fact that multiple sides of the clamping groove are through-type arch-shaped structural units facilitates rapid cell ingrowth into the clamping groove.

[0011] Furthermore, the convex tooth surface comprises an upper convex tooth surface and a lower convex tooth surface; the upper convex tooth surface is formed by an arch-like structural unit extending upwards from the contact surface; the lower convex tooth surface is formed by an arch-like structural unit extending downwards from the contact surface. The upper and lower convex tooth surfaces can increase the friction between the fusion device and the upper and lower vertebral bodies at the implantation site, effectively improving the stability of the fusion device.

[0012] Furthermore, the connection between the upper contact surface, the lower contact surface, and the tail end of the fully porous thoracolumbar fusion device adopts an arc-shaped transition.

[0013] Furthermore, the connection between the upper contact surface, the lower contact surface, and the two side surfaces adopts an arc-shaped transition.

[0014] The multi-faceted thoracolumbar fusion device features an arc-shaped transition at the connection points of multiple surfaces, resulting in a smooth overall profile. This effectively reduces the incidence of damage to surrounding tissues (such as nerves and blood vessels) at the implantation site.

[0015] Furthermore, the porosity of the porous octahedron is 40% to 95%, and the pore size is 300 to 1000 μm.

[0016] Furthermore, the body of the fully porous thoracolumbar fusion device is integrally printed.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] The upper and lower front ends of this fully porous lumbar fusion cage allow for structural matching between the fusion cage and the intervertebral disc implantation site, resulting in a closer fit between the fusion cage and the upper and lower vertebral bodies. The convex toothed surfaces of the upper and lower contact surfaces of the fusion cage closely conform to the patient's endplate, effectively improving the stability of the fully porous lumbar fusion cage after implantation. The fully porous design of the fusion cage facilitates the migration and proliferation of bone tissue cells from the vertebral body to the fusion cage. The surgical fixation holes and clamping grooves provided in the fully porous lumbar fusion cage support the clamping operation of surgical instruments, facilitating the implantation of the fusion cage. Furthermore, the sides of the clamping grooves communicate with the arch-like structural units in the body of the fully porous lumbar fusion cage, promoting rapid cell ingrowth into the clamping grooves and providing a reliable mechanical fixation structure for the fusion cage. The equivalent elastic modulus of the overall structural unit of the fully porous thoracolumbar fusion device provided by this invention 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), which can avoid stress shielding effect and promote new bone formation. The connection points of multiple surfaces of the fully porous thoracolumbar fusion device provided by this invention adopt arc transitions, and the overall contour is smooth, which can effectively reduce the incidence of damage to surrounding tissues (such as nerves and blood vessels) at the implantation site. Attached Figure Description

[0019] Figure 1 This is a first-view structural schematic diagram of the fully porous thoracolumbar fusion device of this utility model.

[0020] Figure 2 This is a second-view structural schematic diagram of the fully porous thoracolumbar fusion device of this utility model.

[0021] Figure 3 This is a side view of the fully porous thoracolumbar fusion device of this utility model.

[0022] Figure 4 This is a top view of the fully porous thoracolumbar fusion device of this utility model.

[0023] Figure 5 This is a schematic diagram of the arch-like structural unit of this utility model.

[0024] Fully porous thoracolumbar fusion device 1. Upper front end 2. Lower front end 3. Front end 4. Tail end 5. Upper contact surface 6. Lower contact surface 7. Side 1 8. Side 2 9. Surgical fixation hole 11. First clamping groove 12. Second clamping groove 13. Connecting beam 14. Upper convex tooth surface 15. Lower convex tooth surface 16. Arch-like structural unit 111. Detailed Implementation

[0025] 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. Example

[0026] like Figures 1-4 As shown, this embodiment provides a fully porous thoracolumbar fusion device 1. The body of the fully porous thoracolumbar fusion device is a porous octahedron; including an upper front end 2, a lower front end 3, a front end 4, a tail end 5, an upper contact surface 6, a lower contact surface 7, and two side surfaces (8 and 9); the tail end 5 is provided with a surgical fixation hole 11 and a clamping groove (12 and 13); the upper contact surface 6 and the lower contact surface 7 are provided with a connecting beam 14 and a toothed surface (15 and 16).

[0027] like Figures 1-3 As shown, the angle between the upper front end 2 and the upper contact surface 6 is 93° to 150°; the angle between the lower front end 3 and the lower contact surface 7 is 93° to 150°. The design of the upper front end 2 and the lower front end 3 allows the fusion device to match the structure of the intervertebral disc implantation site, thereby making the fusion device fit more closely with the upper and lower endplates and increasing the contact area with the endplates.

[0028] like Figure 2 , 4 As shown, the front end 4 is a curved surface, connecting the upper front end 2, the lower front end 3, and the two side surfaces (8 and 9).

[0029] like Figures 1-4 As shown, the body of the fully porous thoracolumbar fusion cage is a porous octahedron composed of interconnected arch-like structural units 111. The porosity of the porous octahedron is 40%–95%, and the pore size is 300–1000 μm. The interconnected porous structure can promote cell adhesion, proliferation, migration, and differentiation, and accelerate bone ingrowth and osteosynthesis. The connections between the multiple faces of the fusion cage adopt arc-shaped transitions, and the overall contour is smooth, which can effectively reduce the incidence of damage to surrounding tissues (such as nerves and blood vessels) caused by the sharp edges of the fusion cage.

[0030] like Figures 1-3 As shown, clamping grooves (12 and 13) are located at the connection between the two sides (8 and 9) and the tail end 5, on both sides of the surgical fixation hole 11. The clamping grooves (12 and 13) support the clamping operation of surgical instruments on the multi-porous thoracolumbar fusion cage, facilitating the implantation of the fusion cage.

[0031] like Figure 1 , 2 As shown, the sides of the clamping grooves (12 and 13) are continuous arch-like structural units. Any side of the clamping groove other than the one closest to the surgical fixation hole 11 is a continuous arch-like structural unit. The multiple continuous arch-like structural units on the clamping grooves facilitate cell ingrowth. The connection between the upper contact surface 6, the lower contact surface 7, and the tail end 5 of the fully porous thoracolumbar fusion device uses an arc-shaped transition. The connection between the upper contact surface 2, the lower contact surface 3, and the two side surfaces (8 and 9) also uses an arc-shaped transition.

[0032] like Figure 3As shown, the arch-shaped structural unit 111 extends upward from the contact surface 6 to form an upper convex surface 15; the arch-shaped structural unit 111 extends downward from the contact surface 7 to form a lower convex surface 16. The upper convex tooth surface 15 and the lower convex tooth surface 16 can 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.

[0033] The main body of the fully porous thoracolumbar fusion device of this invention is integrally printed.

[0034] The fully porous thoracolumbar fusion device of this invention has an equivalent elastic modulus of the 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.

[0035] This invention relates to a fully porous thoracolumbar fusion cage, manufactured using precision 3D printing technology with TC4 titanium alloy material exhibiting excellent biocompatibility. The cage body is a porous octahedron composed of interconnected arch-like structural units, providing more adhesion sites for cells and promoting cell proliferation, migration, differentiation, and accelerated bone ingrowth and fusion. The convex toothed surfaces of the upper and lower contact surfaces of the fusion cage fit tightly against the patient's endplate, effectively improving the stability of the fully porous lumbar fusion cage after implantation. This fully porous thoracolumbar fusion cage exhibits high strength characteristics, and its mechanical properties are highly similar to those of human bone, ensuring post-implantation stability and compatibility. Furthermore, it possesses excellent fatigue resistance, corrosion resistance, and superior biocompatibility, effectively reducing the risk of postoperative rejection.

[0036] 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 thoracolumbar fusion cage, characterized in that, The body of the full-porous thoracolumbar fusion cage is a porous octahedron; the porous octahedron comprises an upper front end, a lower front end, a front end, a tail end, an upper contact surface, a lower contact surface and bilateral surfaces; the tail end is provided with a surgical fixation hole and a clamping groove; the upper contact surface and the lower contact surface are provided with a connecting beam and a convex tooth surface.

2. The all-porous thoracolumbar fusion cage of claim 1, wherein, The included angle between the upper front end and the upper contact surface is 93°-150°; the included angle between the lower front end and the lower contact surface is 93°-150°.

3. The all-porous thoracolumbar fusion cage of claim 1, wherein, The front end is a curved surface, connecting the upper front end, the lower front end and the bilateral surfaces.

4. The all-porous thoracolumbar fusion cage of claim 1, wherein, The porous octahedron is composed of through arch structure units.

5. The all-porous thoracolumbar fusion cage of claim 1, wherein, The clamping groove is arranged at the connection between the bilateral surfaces and the tail end, and is located on both sides of the surgical fixation hole.

6. The all-porous thoracolumbar fusion cage of claim 5, wherein, Any side of the clamping groove, except the side close to the surgical fixation hole, is a through arch structure unit.

7. The all-porous thoracolumbar fusion cage of claim 1, wherein, The convex tooth surface is an upper convex tooth surface and a lower convex tooth surface; the upper convex tooth surface is formed by extending and protruding the arch structure unit upward to the upper contact surface; the lower convex tooth surface is formed by extending and protruding the arch structure unit downward to the lower contact surface.

8. The all-porous thoracolumbar fusion cage of claim 1, wherein, The connection between the upper contact surface, the lower contact surface and the tail end adopts arc transition.

9. The all-porous thoracolumbar fusion cage of claim 1, wherein, The connection between the upper contact surface, the lower contact surface and the bilateral surfaces adopts arc transition.

10. The all-porous thoracolumbar fusion cage of claim 1, wherein, The porosity of the porous octahedron is 40%-95%, and the pore size is 300-1000 μm.

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