Expandable intervertebral fusion cage and method of using same

Abstract

The present application relates to the technical fields, disclose a kind of collection and expansion formula intervertebral fusion cage and its using method.The present application is aimed at solving the technical problems of uneven stress between patients, intervertebral fusion cage sinking and intervertebral non-fusion caused by shape and size limitation in prior art.The present application includes porous structure that vertebral bone can grow into, the upper surface and lower surface of collection and expansion formula intervertebral fusion cage are provided with anti-skid structure, collection and expansion formula intervertebral fusion cage includes fixed part and rotating part, to realize the rotating part rotation around fixed part and form bone grafting bin, fixed part and / or rotating part are correspondingly provided with clamping groove and / or distraction slot.The present application has the advantages of reducing intervertebral fusion cage sinking, expanding bone grafting bin and promoting intervertebral fusion by expanding the effective supporting area of intervertebral fusion cage and the contact surface with vertebral bone.

Description

Technical Field

[0001] This invention relates to the field of technology, and more particularly to a retractable interbody fusion device and its method of use. Background Technology

[0002] With the aging of my country's population, the incidence of degenerative disc diseases and other lesions is gradually increasing. Degeneration can lead to spondylolisthesis or instability of the intervertebral disc and other intervertebral disc diseases, requiring interbody fusion surgery.

[0003] In the existing technical field, Chinese patent document CN203736351U discloses a lumbar fusion cage accessed via the intervertebral foramen, comprising a main body and a radiopaque needle. The main body includes an anterior sidewall, a posterior sidewall, an upper surface, a lower surface, an anterior segment, and an posterior segment. The interior of the main body is hollow, forming an internal cavity. The upper and lower surfaces are both convex arcuate surfaces. The anterior and posterior sidewalls are both arcuate surfaces, and arcuate grooves are provided at the junctions of the anterior and posterior sidewalls and the posterior segment. This patent discloses a lumbar fusion cage that, in addition to the main body, requires a radiopaque needle for positioning, making the design relatively complex. Furthermore, the mechanical properties of the fusion cage are affected by its structure. The patent states that the bone graft window "can provide nutrition and blood supply to the bone in the fusion cage, providing good physiological conditions for bony fusion." However, since the fusion cage already has a hollow internal cavity within its main body, adding a bone graft window would be redundant and would adversely affect the structural stability of the main body. Interbody fusion cages have a fixed shape. In use, due to limitations in shape and size, if the size is too large, it cannot be placed during surgery, while if the size is too small, it is easy for the interbody fusion cage to sink and for the intervertebral discs to not fuse. Therefore, there is still a need for an interbody fusion cage with adjustable size. Summary of the Invention

[0004] In view of the above technical problems, this disclosure provides a retractable intervertebral fusion device and its usage method, which solves the technical problems in the prior art that are easily caused by the limitations of shape and size, resulting in uneven force on the intervertebral discs, sinking of the intervertebral fusion device and non-fusion of the intervertebral discs.

[0005] According to one aspect of this disclosure, a retractable interbody fusion device is provided, including a porous structure into which vertebral bone can grow. The upper and lower surfaces of the retractable interbody fusion device are provided with anti-slip structures. The retractable interbody fusion device includes a fixing part and a rotating part, so that the rotating part can rotate around the fixing part to form a bone graft chamber. The fixing part and / or the rotating part are respectively provided with clamping grooves and / or spreading grooves.

[0006] In some embodiments of this disclosure, an X-shaped rotating interbody fusion device is included. The X-shaped rotating interbody fusion device includes a self-locking mortise and tenon structure, a pair of cross-arranged left and right assembly bodies that can be rotated open into an X shape, and a rotating shaft is provided in the middle of the left and right assembly bodies. The self-locking mortise and tenon structure includes a first tenon groove provided on the left assembly body, a second tenon groove provided on the right assembly body, and a tenon. The tenon is shaped and positioned to fit the first and second tenon grooves. The support surface of the retractable interbody fusion device is provided with a porous structure. The pore size of the porous structure is 400~600μm and the porosity is 50%~80%.

[0007] In some embodiments of this disclosure, an L-shaped opening interbody fusion device is included. The L-shaped opening interbody fusion device includes a self-locking mortise and tenon structure, a rotatable connection between a left side portion and a right side portion that can be opened; the front end of the left side portion and the front end of the right side portion are provided with a rotation axis; the self-locking mortise and tenon structure includes a first mortise groove provided on the left side portion, a second mortise groove provided on the right side portion, and a tenon, the tenon being shaped and positioned to fit into the first mortise groove and the second mortise groove.

[0008] In some embodiments of this disclosure, a fan-shaped telescopic interbody fusion device is included. The fan-shaped telescopic interbody fusion device includes a self-locking mortise and tenon structure, a rotating shaft, and at least one set of fan-shaped frames. The rotating shaft includes an outer shaft and an inner shaft. The fan-shaped frames include an outer frame and an inner frame. The outer shaft connects to the outer frame, and the inner shaft connects to the inner frame, so as to realize the sequential rotation of the inner frame into and out of the outer frame. The self-locking mortise and tenon structure includes a first mortise groove provided on the outer frame, a second mortise groove provided on the inner frame, and a tenon. The tenon is shaped and positioned to fit into the first mortise groove and the second mortise groove.

[0009] In some embodiments of this disclosure, an umbrella-shaped telescopic interbody fusion device is included. The umbrella-shaped telescopic interbody fusion device has a mirror-symmetrical structure. The umbrella-shaped telescopic interbody fusion device includes a central support, multiple rotating components, umbrella blades that can rotate and open around the central support, and umbrella blade support. The rotating components include a bracket, a rotating shaft, and a connecting plate. The bracket is fixedly connected to the central support, the rotating shaft passes through the bracket to rotate within the bracket, one end of the connecting plate is connected to the rotating shaft, and the other end is connected to the umbrella blades. The lower surface of the umbrella blades is provided with grooves corresponding to the umbrella blade support.

[0010] In some embodiments of this disclosure, the anti-slip structure includes toothed anti-slip protrusions / cylindrical anti-slip protrusions.

[0011] In some embodiments of this disclosure, the retractable interbody fusion device comprises high molecular weight polyethylene and / or polyurethane and / or polyetheretherketone and / or hydroxyapatite and / or zinc oxide and / or polylactic acid and / or calcium phosphate materials.

[0012] In some embodiments of this disclosure, the outer surface of the retractable interbody fusion device is coated with a hydroxyapatite coating.

[0013] In some embodiments of this disclosure, a tantalum wire is also included embedded in the central axis of the retractable interbody fusion device.

[0014] According to another aspect of this disclosure, a method for using a retractable interbody fusion cage is provided, applicable to the aforementioned retractable interbody fusion cage, comprising the following steps:

[0015] (1) Detection and model determination: Using an external scanning device, the size of the intervertebral disc that needs to be adjusted is obtained, and the thickness of the required intervertebral fusion device is determined;

[0016] (2) Printing the corresponding interbody fusion device: Use a 3D printer to print the retractable interbody fusion device, including X-shaped rotary interbody fusion device / L-shaped opening interbody fusion device / fan-shaped telescopic interbody fusion device / umbrella-shaped telescopic interbody fusion device, selected in the following order:

[0017] (a) According to the required spacing between intervertebral discs from largest to smallest, the priority of design and installation is as follows: fan-shaped telescopic intervertebral fusion device, umbrella-shaped telescopic intervertebral fusion device, X-shaped rotary intervertebral fusion device, and L-shaped open intervertebral fusion device.

[0018] (b) According to the intervertebral area from largest to smallest, the priority of design and installation is as follows: umbrella-shaped telescopic interbody fusion device, X-shaped rotary interbody fusion device, fan-shaped telescopic interbody fusion device, and L-shaped open interbody fusion device.

[0019] (c) When the aspect ratio of the installation area in step (a) or step (b) is greater than 1.5, a combination of a fan-shaped telescopic interbody fusion device / umbrella-shaped telescopic interbody fusion device in the middle and an L-shaped open interbody fusion device on both sides is adopted.

[0020] (4) Placement of interbody fusion device: With the retractable interbody fusion device in its smallest working state, clamp the clamping slot of the retractable interbody fusion device with clamping forceps and place it on the affected area;

[0021] (4) Shaping: Each interbody fusion cage in step (3) is rotated and opened to the required angle by using a spreading device through a spreading groove;

[0022] (5) Positioning: After step (4), bone cement is injected into the gap between the openings of the rotating parts of each intercondylar fusion device using a bone cement injector.

[0023] The beneficial effects of this invention are as follows:

[0024] The rotating part rotates around the fixed part to form a bone graft chamber, which expands the effective support area of ​​the intervertebral fusion device and the contact area with the vertebral bone. The gap between the rotating parts is expanded, the volume of the bone graft chamber is increased, and bone cement is implanted in the bone graft chamber to promote intervertebral fusion, reduce the sinking of the intervertebral fusion device, and the intervertebral fusion device is evenly stressed after being fixed by bone cement.

[0025] The anti-slip structure is designed to facilitate the implantation of the interbody fusion device into the patient's body and prevent it from slipping out.

[0026] The clamping groove is designed to facilitate the clamping and fixation of the interbody fusion device, and the operation is simple.

[0027] A support groove is provided to facilitate the rotation of the rotating part around the fixed part, thereby opening the intervertebral fusion device;

[0028] Before the surgery, the interbody fusion device is small in size, making it easy to implant into the patient's body;

[0029] After being implanted into the patient's body, the interbody fusion device rotates and expands, increasing the force-bearing area of ​​the interbody fusion device and providing strong support.

[0030] A self-locking structure is installed to prevent the interbody fusion device from moving, thereby achieving fixation of the interbody fusion device;

[0031] The outer surface is coated with a hydroxyapatite coating, which facilitates bone ingrowth and increases stability.

[0032] The interbody fusion cage has a tantalum wire built into its central axis to serve as a marker for X-ray imaging, facilitating subsequent treatment for the patient.

[0033] Hydroxyapatite has high bioactivity and can promote bone growth and accelerate bone fusion. Zinc oxide can improve antibacterial ability, enhance the anti-inflammatory performance of interbody fusion devices, and improve the osteoinduction and osteointegration performance of the bone-bonding surface, thereby stabilizing the spine and reducing infection, thus reducing the infection situation after interbody fusion device implantation. Calcium phosphate can promote bone fusion and has degradation activity that is coordinated with osteogenic activity.

[0034] The porosity design prevents the device from sinking after surgery, protecting the underlying intervertebral discs and the entire spine.

[0035] During use, the combination of multiple structures provides support for the vast majority of disease conditions, offering more comprehensive and robust protection options. Attached Figure Description

[0036] Figure 1 A three-dimensional view of a rotary interbody fusion device that can deform into an X-shape;

[0037] Figure 2 A top view of a rotary interbody fusion device that can deform into an X-shape;

[0038] Figure 3 This is a schematic diagram of the tenon structure;

[0039] Figure 4 A three-dimensional view of an open interbody fusion device that can deform into an L-shape;

[0040] Figure 5 A perspective view of a sector-shaped telescopic interbody fusion device comprising a set of sector-shaped frames;

[0041] Figure 6 for Figure 5 A 3D view of the inner frame being screwed into the outer frame;

[0042] Figure 7 A three-dimensional view of a sector-shaped telescopic interbody fusion device comprising six sets of sector-shaped frames;

[0043] Figure 8 for Figure 7 A 3D view of the inner frame being screwed into the outer frame;

[0044] Figure 9 A three-dimensional view of a telescopic interbody fusion device in the shape of an umbrella when the umbrella blades are not open;

[0045] Figure 10 A three-dimensional view of a telescopic interbody fusion device in the shape of an umbrella when its blades are open;

[0046] Figure 11 A three-dimensional view of an umbrella-shaped telescopic interbody fusion device supported by umbrella-shaped struts;

[0047] The component names in the diagram are as follows: 1 is the left assembly, 2 is the right assembly, 3 is the first rotating shaft, 4 is the first bone graft chamber, 5 is the first clamping groove, 6 is the second clamping groove, 7 is the first support groove, 8 is the second support groove, 9 is the first toothed anti-slip protrusion, 10 is the self-locking mortise and tenon structure, 11 is the first mortise, 12 is the second mortise, 13 is the first tenon, 14 is the left side, 15 is the right side, 16 is the second bone graft chamber, 17 is the second rotating shaft, 18 is the third rotating shaft, 19 is the third clamping groove, 20 is the fourth clamping groove, 21 is the third support groove, 22 is the fourth support groove, 23 is the second toothed anti-slip protrusion, 24 is the first... 25 is the fourth mortise, 26 is the second tenon, 27 is the fourth rotating shaft, 28 is the fan-shaped frame, 29 is the third anti-slip structure, 30 is the outer shaft, 31 is the inner shaft, 32 is the outer frame, 33 is the inner frame, 34 is the fourth anti-slip structure, 35 is the fifth clamping groove, 36 is the third bone graft chamber, 37 is the fifth mortise, 38 is the sixth mortise, 39 is the third tenon, 40 is the central support, 41 is the rotating component, 42 is the umbrella leaf, 43 is the umbrella leaf support, 44 is the sixth clamping groove, 45 is the bracket, 46 is the rotating shaft, 47 is the connecting plate, 48 is the fifth anti-slip structure, 49 is the fourth bone graft chamber, and 50 is the groove. Detailed Implementation

[0048] 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

[0049] This example discloses a rotary interbody fusion device that can deform into an X-shape. See [link to relevant documentation]. Figures 1 to 3 The intervertebral fusion device includes a pair of cross-shaped left and right assembly bodies 1 and 2 that can be rotated and opened into an X shape. A first rotating shaft 3 is installed on the left and right assembly bodies 1 and 2. The left assembly body 1 is provided with a first clamping groove 5 and a first spreading groove 7, and the right assembly body 2 is provided with a second clamping groove 6 and a second spreading groove 8. When the left and right assembly bodies 1 and 2 are closed, one end of the intervertebral fusion device is frustum-shaped and the other end is cuboid-shaped. After the left and right assembly bodies 1 and 2 are rotated and spread apart by the first rotating shaft 3, the intervertebral fusion device is X-shaped. The gap in the X-shape forms a first bone graft chamber 4, which is used to fill bone cement to fix the intervertebral fusion device.

[0050] The opening angle between the left assembly 1 and the right assembly 2 is 0~90 degrees. The upper and lower surfaces of the left assembly 1 and the right assembly 2 are provided with anti-slip structures, including several first tooth-shaped anti-slip protrusions 9 or several cylindrical anti-slip protrusions. The X-shaped rotary interbody fusion device includes a porous structure with a pore size of 400~600μm and a porosity of 50%~80%. The X-shaped rotary interbody fusion device includes materials such as high molecular weight polyethylene and / or polyurethane and / or polyetheretherketone and / or hydroxyapatite and / or zinc oxide and / or polylactic acid and / or calcium phosphate. It also includes tantalum wires embedded in the central axis of the left assembly 1 and the right assembly 2. The outer surface of the X-shaped rotary interbody fusion device is coated with a hydroxyapatite coating. It also includes a self-locking mortise and tenon structure 10, which includes a first mortise 11 on the left assembly 1, a second mortise 12 on the right assembly 2, and a first tenon 13, which is shaped and positioned to fit the first mortise 11 and the second mortise 12.

[0051] The usage method of this example includes the following steps:

[0052] Detection and model determination: Using external scanning equipment, the size of the intervertebral disc that needs adjustment is determined, and the thickness of the required intervertebral fusion device is determined;

[0053] Print the corresponding interbody fusion cage: Use a 3D printer to print the retractable interbody fusion cage, including X-shaped rotary interbody fusion cage / L-shaped opening interbody fusion cage / fan-shaped telescopic interbody fusion cage / umbrella-shaped telescopic interbody fusion cage, selected in the following order:

[0054] Based on the required spacing between intervertebral discs from largest to smallest, the design and installation priority is as follows: fan-shaped telescopic intervertebral fusion device, umbrella-shaped telescopic intervertebral fusion device, X-shaped rotary intervertebral fusion device, and L-shaped open intervertebral fusion device.

[0055] Based on the intervertebral area from largest to smallest, the design and installation priority is as follows: umbrella-shaped telescopic interbody fusion device, X-shaped rotary interbody fusion device, fan-shaped telescopic interbody fusion device, and L-shaped open interbody fusion device.

[0056] When the aspect ratio of the installation area in step (a) or step (b) is greater than 1.5, a combination of a fan-shaped telescopic interbody fusion device / umbrella-shaped telescopic interbody fusion device in the middle and an L-shaped open interbody fusion device on both sides is adopted.

[0057] Placement of the interbody fusion cage: With the retractable interbody fusion cage in its smallest working state, the clamping slot of the retractable interbody fusion cage is held by clamping forceps and placed on the affected area;

[0058] Shaping: In step (3), each interbody fusion cage is rotated and opened to the required angle by using a spreading device through a spreading groove;

[0059] Positioning: After step (4), bone cement is injected into the gap between the openings of the rotating parts of each intercondylar fusion device using a bone cement injector. Example 2

[0060] The principle of this example is the same as that of Example 1, the specific difference being that this example discloses an open interbody fusion device that can deform into an L-shape, see [link to example]. Figure 4 The interbody fusion device includes a rotatable, openable left side portion 14 and a right side portion 15. A second bone graft chamber 16 is formed between the left side portion 14 and the right side portion 15. The front end of the left side portion 14 is provided with a second rotation axis 17, the front end of the right side portion 15 is provided with a third rotation axis 18, the rear end of the left side portion 14 is provided with a third clamping groove 19, the rear end of the right side portion 15 is provided with a fourth clamping groove 20, the rear end of the left side portion 14 is provided with a third opening groove 21, and the rear end of the right side portion 15 is provided with a fourth opening groove 22. When the left side portion 14 and the right side portion 15 are closed, one end of the interbody fusion device is frustum-shaped, and the other end is cuboid, which facilitates implantation into the patient's body. After the left side portion 14 and the right side portion 15 are rotated and opened by the second rotation axis 17 and the third rotation axis 18, the opening angle between the left side portion 14 and the right side portion 15 is 0 to 90 degrees. The interbody fusion device is L-shaped. The volume of the second bone graft chamber 16 increases, and more bone cement is filled in to fix the interbody fusion device.

[0061] The upper and lower surfaces of the left side portion 14 and the right side portion 15 are provided with anti-slip structures, which include several second tooth-shaped anti-slip protrusions 23. The open-type interbody fusion cage includes a porous structure with a pore size of 400~600μm and a porosity of 50%~80%. The open-type interbody fusion cage is made of high molecular weight polyethylene and / or polyurethane and / or polyetheretherketone and / or hydroxyapatite and / or zinc oxide and / or polylactic acid and / or calcium phosphate. A tantalum wire is built into the central axis of the open-type interbody fusion cage. It also includes a self-locking tenon and mortise structure, which includes a third tenon 24 on the left side portion 14, a fourth tenon 25 on the right side portion 15, and a second tenon 26, which fits into the third tenon 24 and the fourth tenon 25. The second tenon 26 has the same structure as the first tenon 13, so it is not repeated in the accompanying drawings. Example 3

[0062] The principle of this example is the same as that of Example 1, the specific difference being that this example discloses a fan-shaped telescopic interbody fusion device, see [link to example]. Figure 5 and Figure 6 ,

[0063] The system includes a fourth rotating shaft 27 and a set of fan-shaped frames 28. The upper and lower surfaces of the fourth rotating shaft 27 are provided with several third anti-slip structures 29. The fourth rotating shaft 27 includes an outer shaft 30 and an inner shaft 31. The fan-shaped frames 28 include an outer frame 32 and an inner frame 33. The outer shaft 30 connects to the outer frame 32, and the inner shaft 31 connects to the inner frame 33, allowing the inner frame 33 to rotate in and out of the outer frame 32 sequentially. The upper and lower surfaces of the outer frame 32 are provided with several fourth anti-slip structures 34, and the rear end of the outer frame 32 is provided with a fifth clamping groove 35. The gap between the inner frame 33 and the outer frame 32 serves as a third bone graft chamber 36.

[0064] The third anti-slip structure 29 includes cylindrical anti-slip protrusions. The fourth anti-slip structure 34 includes toothed anti-slip protrusions. The fan-shaped telescopic interbody fusion device includes a porous structure with a pore size of 400-600 μm and a porosity of 50%-80%. The fan-shaped telescopic interbody fusion device includes high molecular weight polyethylene and / or polyurethane and / or polyether ether ketone and / or hydroxyapatite and / or zinc oxide and / or polylactic acid and / or calcium phosphate materials. The fan-shaped telescopic interbody fusion device also includes a tantalum wire built into the central axis of the fan-shaped telescopic interbody fusion device. The fan-shaped telescopic interbody fusion device also includes a self-locking mortise and tenon structure, which includes a fifth tenon 37 on the outer frame 32, a sixth tenon 38 on the inner frame 33, and a third tenon 39, the third tenon 39 being shaped and positioned to fit the fifth tenon 37 and the sixth tenon 38. The second tenon 39 has the same structure as the first tenon 13, so it is not marked again in the attached drawings of the instruction manual. Example 4

[0065] The principle of this embodiment is the same as that of Embodiment 3, the specific difference being that the fan-shaped telescopic interbody fusion device includes a fourth rotation axis 27 and six sets of fan-shaped frames 28. See also... Figure 7 and Figure 8 . Example 5

[0066] The principle of this example is the same as that of Example 1, the specific difference being that this example discloses an umbrella-shaped telescopic interbody fusion device with a mirror-symmetrical structure. See [link to example]. Figures 9 to 11 ,

[0067] The device includes a central support 40, multiple rotating components 41, umbrella-shaped leaves 42 and umbrella-shaped support 43 that can rotate and open around the central support 40; the central support 40 is provided with a sixth clamping groove 44; the rotating components 41 include a bracket 45, a rotating shaft 46, and a connecting plate 47. The bracket 45 is fixedly connected to the central support 40, the rotating shaft 46 passes through the bracket 45 to rotate within the bracket 45, and one end of the connecting plate 47 is connected to the rotating shaft 46, and the other end is connected to the umbrella-shaped leaves 42; the upper surface of the umbrella-shaped leaves 42 is provided with a fifth anti-slip structure 48, and the lower surface of the umbrella-shaped leaves 42 is provided with a groove 50 corresponding to the umbrella-shaped support 43. The fifth anti-slip structure 48 includes toothed anti-slip protrusions. The gaps between the umbrella-shaped leaves 42 serve as a fourth bone graft chamber 49. The fifth anti-slip structure 48 includes toothed anti-slip protrusions. The umbrella-shaped telescopic interbody fusion device includes a porous structure with a pore size of 400~600μm and a porosity of 50%~80%. The umbrella-shaped telescopic interbody fusion cage comprises materials such as polyethylene and / or polyurethane and / or polyetheretherketone and / or hydroxyapatite and / or zinc oxide and / or polylactic acid and / or calcium phosphate. The umbrella-shaped telescopic interbody fusion cage also includes a tantalum wire embedded in the central axis of the umbrella-shaped telescopic interbody fusion cage.

[0068] Although some preferred embodiments of the 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 invention.

[0069] Obviously, those skilled in the art can make various modifications and variations to this invention 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 invention is also intended to include these modifications and variations.

Claims

1. A retractable interbody fusion device, comprising a porous structure into which vertebral bone can grow, characterized in that: The retractable interbody fusion device includes a fan-shaped telescopic interbody fusion device, which comprises a self-locking mortise and tenon structure, a rotating shaft, and at least one set of fan-shaped frames. The rotating shaft includes an outer shaft and an inner shaft, and the fan-shaped frames include an outer frame and an inner frame. The outer shaft connects to the outer frame, and the inner shaft connects to the inner frame, so as to realize the sequential rotation of the inner frame into and out of the outer frame. The self-locking mortise and tenon structure includes a first mortise on the outer frame, a second mortise on the inner frame, and a tenon. The tenon is shaped and positioned to fit the first mortise and the second mortise. The upper and lower surfaces of the fan-shaped telescopic interbody fusion device are provided with anti-slip structures, and the outer frame is provided with corresponding clamping grooves and / or spreading grooves. The supporting surface of the fan-shaped telescopic interbody fusion device is provided with a porous structure, the pore size of which is 400~600μm and the porosity is 50%~80%.

2. The retractable interbody fusion device as described in claim 1, characterized in that: The anti-slip structure includes toothed anti-slip protrusions / cylindrical anti-slip protrusions.

3. The retractable interbody fusion device as described in claim 1, characterized in that: The retractable interbody fusion device comprises high molecular weight polyethylene and / or polyurethane and / or polyetheretherketone and / or hydroxyapatite and / or zinc oxide and / or polylactic acid and / or calcium phosphate materials.

4. The retractable interbody fusion device as described in claim 1, characterized in that: The outer surface of the retractable interbody fusion device is coated with a hydroxyapatite coating.

5. The retractable interbody fusion device as described in claim 1, characterized in that: It also includes a tantalum wire embedded in the central axis of the retractable interbody fusion device.

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