Intervertebral fusion cage

Abstract

An intervertebral fusion cage includes a cage, a sliding part, a transmission part and a lifting part. The cage is provided with a first opening on the side surface, and symmetrical second and third openings on the upper and lower surfaces, and diagonal arc-shaped first limiting blocks. The arc-shaped sliding part is connected through a rotating block passing through the second opening, the rotating block is provided with a first thread, and after rotating 90°, it is moved to the side surface and locked by the first limiting block. The transmission part screw rod extends into the first opening, and is provided with second and third threads on the upper surface; the second thread first engages the first thread to drive the rotating block, and after the stroke is completed, the third thread engages the driving gear to drive the two side driven gears. The driven gear support column is provided with a thread, an outer sleeve, a guide hole and a ratchet tooth in the sleeve. The lifting part inner thread cooperates with the support column, the outer wall limiting block slides along the guide hole, and the spring pushes the hemisphere block and the ratchet tooth to prevent retreat. The lifting part is connected with a fixed part, which extends out through the third opening, and the surface triangular block engages the lamina to enhance fixation.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to an interbody fusion device. Background Technology

[0002] The precision of interbody fusion cage implantation directly affects the clinical efficacy of spinal surgery. With the popularization of minimally invasive spinal surgery techniques, the transforaminal or posterior approach has become the mainstream. In these procedures, the fusion cage needs to enter the intervertebral space along an inclined path through the "safe triangle" area lateral to the nerve root and dural sac. Due to the anatomically narrow channel, during the percussion advancement process, the proximal (posterior) or lateral wall of the fusion cage will inevitably make dynamic line contact with the inferior articular process or inner edge of the laminae of the superior vertebral body.

[0003] Extensive analysis of surgical videos and biomechanical experiments revealed that the stress concentration generated by this dynamic contact during surgery is sufficient to cause plastic deformation and even bone fragment detachment from the inner edge of the lamina. Existing techniques mostly improve anti-slip properties or facilitate insertion by increasing the surface roughness of the fusion cage or adopting a bullet-shaped design; however, these designs actually exacerbate the bone-cutting effect in the early stages of implantation. For example, fusion cages with reverse teeth or serrated anti-slip structures can cause "file-like" wear on the lamina during repeated adjustments before final placement.

[0004] The clinical consequences of this type of bone wear are multifaceted: Structural integrity failure: Damage to the integrity of the lamina as an important load-bearing and tension band structure of the posterior column.

[0005] Bone loss: For patients with osteoporosis, this wear and tear may lead to irreversible bone loss, affecting the effectiveness of pedicle screw fixation in the later stages.

[0006] Foreign body reaction risk: If the detached bone fragments are not thoroughly cleaned, they can easily lead to postoperative heterotopic ossification or nerve compression.

[0007] In view of this, the present invention provides an improved interbody fusion device, which aims to transform the harmful friction mode during the implantation process into a low-damage sliding mode through a specific geometric design, thereby protecting the bone safety of the vertebral lamina from the source. Summary of the Invention

[0008] The main objective of this invention is to provide an interbody fusion device to solve the problem that existing interbody fusion devices are prone to sharp friction with bone during implantation, leading to severe bone wear.

[0009] To achieve the above objectives, the present invention provides an intervertebral fusion device, specifically comprising: a fusion device, which is a hollow shell, having a circular first opening on its side, and second openings symmetrically arranged on the upper and lower surfaces of the fusion device penetrating its outer surface, with a third opening corresponding to the second openings and penetrating the surface of the fusion device; a sliding part, symmetrically arranged on the upper and lower surfaces of the fusion device, with rotating blocks symmetrically arranged between the sliding parts, and a first thread in the center of the rotating block; a transmission part, disposed inside the fusion device, comprising a screw, with a second and a third thread on the screw, a drive gear sleeved on the screw, a fourth thread in the center of the drive gear, a driven gear meshing on the drive gear, a support column on the driven gear, and a fifth thread on the outer surface of the support column; and a lifting part, sleeved on the outer surface of the support column, with a sixth thread on the inner surface of the lifting part meshing with the fifth thread, and a fixing part connected to the upper part of the lifting part.

[0010] Furthermore, the screw can pass through the first opening and extend into the fusion unit, and rotate inside the fusion unit. The rotating block can pass through the second opening and connect with the sliding part, and rotate inside the second opening. During the rotation, the rotating block can drive the sliding part to rotate 90°, so that the sliding part rotates from the upper and lower surfaces of the fusion unit to the side of the fusion unit. The fixing part can pass through the third opening and extend out of the fusion unit. Two first limiting blocks are provided at the diagonal ends of the fusion unit, and the cross-section of the first limiting block is an arc surface.

[0011] Furthermore, the sliding part has a circular arc cross-section, which reduces friction when the sliding part contacts the vertebral plate. The first thread in the middle of the rotating block meshes with the second thread on the screw. When the screw rotates, it can drive the rotating block to rotate. The upper and lower parts of the sliding part are obliquely symmetrically provided with fourth openings. The first limiting block can be inserted into the fourth opening to limit the sliding part.

[0012] Furthermore, the third thread meshes with the fourth thread on the drive gear. The third thread is positioned between the two second threads. After the second thread has completed its stroke, the third thread begins to drive the fourth thread to rotate. After the sliding part has finished rotating, the screw drives the drive gear to rotate.

[0013] Furthermore, the driven gear is also provided with a sleeve, which is set outside the support column with a gap between them. The inner surface of the sleeve is evenly provided with four fifth openings, the fifth openings having a triangular cross-section. The inner surface of the sleeve is evenly provided with four rows of ratchet teeth. A retaining ring is fitted outside the driven gear, and a connecting rod is symmetrically provided on the retaining ring. The connecting rod is connected to the side surface of the fusion device, thereby providing support for the driven gear.

[0014] Furthermore, the lifting part is disposed between the support column and the sleeve. Four second limiting blocks are evenly disposed on the outer surface of the lifting part. The second limiting blocks can be engaged in the fifth opening and move up and down. Four sixth openings are evenly disposed on the outer surface of the lifting part. A fourth limiting block is disposed on the surface of the fixing part. The fourth limiting block is a triangular block. Since the second limiting blocks on the outer surface of the lifting part are engaged in the fifth opening of the sleeve, the fifth opening provides circumferential constraint. Therefore, under the rotational drive of the support column, the lifting part can only make linear reciprocating motion along the axial direction.

[0015] Furthermore, a spring is connected to the sixth opening, and a push block is connected to the other end of the spring. A third limiting block in the shape of a hemisphere is connected to the end of the push block away from the spring. The third limiting block can extend out of the sixth opening and contact the ratchet to limit the lifting part.

[0016] Furthermore, at least a portion of the sliding part is made of a porous biocompatible material with a porosity of 50% to 85%, which is used to induce bone tissue ingrowth. When the sliding part rotates to the side of the fusion device, bone fragments generated during implantation can penetrate the porous biocompatible material through the second opening on the upper and lower surfaces of the fusion device.

[0017] According to the technical solution of the present invention, an intervertebral fusion device includes a fusion device, a sliding part, a transmission part, and a lifting part. The fusion device is a hollow shell. A circular first opening is provided on the side of the fusion device. Simultaneously, second openings penetrating the outer surface of the fusion device are symmetrically arranged on the upper and lower surfaces of the fusion device. A third opening penetrating the surface of the fusion device is provided between the second openings. Two first limiting blocks are provided at opposite corners of the fusion device, each with an arc-shaped cross-section. Sliding parts are symmetrically arranged on the upper and lower surfaces of the fusion device, each with an arc-shaped cross-section to reduce friction during contact with the lamina. Rotating blocks are symmetrically arranged between the sliding parts, passing through the second openings to connect with and rotate within them. During rotation, the rotating blocks drive the sliding parts to rotate 90°, moving them from the upper and lower surfaces of the fusion device to the side surface. A first thread is provided in the center of the rotating block. Fourth openings are obliquely symmetrically arranged at the diagonal ends of the upper and lower parts of the sliding part, allowing the first limiting blocks to engage with them, thus limiting the sliding parts. A transmission part is located inside the fusion device, including a screw that can pass through... The first opening extends into the fusion device and rotates within it. The screw has a second thread and a third thread. The second thread meshes with the first thread, and the screw's rotation drives the rotating block to rotate. The third thread is positioned between the two second threads and begins to rotate only after the second threads have completed their travel. A drive gear is fitted onto the screw. A fourth thread is located in the middle of the drive gear and meshes with the third thread. Driven gears mesh on both sides of the drive gear. A cylindrical support column is provided on the upper part, and a fifth thread is provided on the outer surface of the support column. A sleeve is also provided on the driven gear, and the sleeve is placed outside the support column with a gap between them. Four fifth openings are evenly provided on the inner surface of the sleeve, and the fifth openings have a triangular cross-section. Four rows of ratchet teeth are evenly provided on the inner surface of the sleeve. A retaining ring is fitted on the outside of the driven gear, and a connecting rod is symmetrically provided on the retaining ring. The connecting rod is connected to the side surface of the fusion device, thereby supporting the driven gear and allowing the driven gear to rotate around the retaining ring.The lifting part is disposed between the support column and the sleeve of the driven gear. The inner surface of the lifting part is provided with a sixth thread that meshes with the fifth thread. Four second limiting blocks are evenly distributed on the outer surface of the lifting part. These second limiting blocks can engage with the fifth opening and move up and down. Four sixth openings are evenly distributed on the outer surface of the lifting part. A spring is correspondingly connected to each sixth opening. A pushing block is connected to the other end of the spring. A third limiting block, shaped like a hemisphere, is connected to the end of the pushing block away from the spring. The third limiting block can extend out of the sixth opening and contact the ratchet, thereby limiting the lifting part. A fixing part is provided on the lifting part. The fixing part can pass through the third opening on the fusion device and extend into the fusion device. Simultaneously, a fourth limiting block, shaped like a triangle, is provided on the surface of the fixing part. The fourth limiting block can contact the upper and lower vertebral plates to enhance the fixation of the fusion device.

[0018] Therefore, the technical solution of this application, by setting a structure that can switch the contact with the lamina during different implantation processes, reduces friction during implantation and enhances the fixation effect of the fusion device and the lamina after implantation, thus solving the problem that existing interbody fusion devices are prone to friction with bone during implantation, leading to severe bone wear. Attached Figure Description

[0019] 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 A cross-sectional view of the interbody fusion device is shown; Figure 3 A side view of the fusion device is shown; Figure 4 A side view of the sliding part is shown; Figure 5 A side view of the driven gear is shown; Figure 6 A side view of the lifting section is shown; Figure 7 A cross-sectional view of the sixth opening is shown; The above-mentioned figures include the following reference numerals: 1. Fusion unit; 10. First opening; 11. Second opening; 12. Third opening; 13. First limiting block; 2. Sliding part; 20. Rotating block; 21. First thread; 22. Fourth opening; 3. Transmission part; 30. Screw; 300. Second thread; 301. Third thread; 31. Driving gear; 310. Fourth thread; 32. Driven gear; 320. Support column; 321. Fifth thread; 322. Sleeve; 3220. Fifth opening; 3221. Racket; 323. Snap ring; 324. Connecting rod; 4. Lifting part; 40. Sixth thread; 41. Second limiting block; 42. Sixth opening; 420. Spring; 421. Pushing block; 422. Third limiting block; 43. Fixing part; 430. Fourth limiting block. Detailed Implementation

[0020] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] 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.

[0022] 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 figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0023] like Figure 1-7As shown: An intervertebral fusion device includes a fusion device 1, a sliding part 2, a transmission part 3, and a lifting part 4. The fusion device 1 is a hollow shell. A circular first opening 10 is provided on the side of the fusion device 1. Simultaneously, second openings 11 penetrating the outer surface of the fusion device 1 are symmetrically arranged on the upper and lower surfaces of the fusion device 1. A third opening 12 penetrating the surface of the fusion device 1 is provided between the second openings 11. Two first limiting blocks 13 are provided at opposite corners of the fusion device 1. The first limiting blocks 13 have a circular arc cross-section. The sliding part 2 is symmetrically arranged on the upper and lower surfaces of the fusion device 1. The sliding part 2 has a circular arc cross-section, which reduces friction during contact with the vertebral laminae. Rotating blocks 20 are symmetrically arranged between the sliding parts 2. The rotating blocks 20 can pass through the second openings 10. The rotating block 20 is connected to the sliding part 2 and rotates within the second opening 11. During rotation, the rotating block 20 can drive the sliding part 2 to rotate 90°, so that the sliding part 2 rotates from the upper and lower surfaces of the fusion unit 1 to the side of the fusion unit 1. The rotating block 20 is provided with a first thread 21 in the middle. The upper and lower parts of the sliding part 2 are obliquely symmetrically provided with fourth openings 22 at their diagonal ends. The first limiting block 13 can be inserted into the fourth opening 22 to limit the sliding part 2. The transmission part 3 is disposed inside the fusion unit 1. The transmission part 3 includes a screw 30. The screw 30 can pass through the first opening 10 and extend into the fusion unit 1, and rotate within the fusion unit 1. The screw 30 is provided with a second thread 300 and a third thread 301. The second thread 300 meshes with the first thread 21. During the rotation of the screw 30, it can drive the rotating block 20 to rotate. The third thread 301 is located between the two second threads 300. The third thread 301 only starts to rotate after the stroke of the second thread 300 is completed. A driving gear 31 is sleeved on the screw 30. A fourth thread 310 is provided in the middle of the driving gear 31. The fourth thread 310 meshes with the third thread 301. Driven gears 32 mesh on both sides of the driving gear 31. A cylindrical support column 320 is provided on the driven gear 32. The outer surface of the support column 320 is provided with a fifth thread 321. The driven gear 32 is also provided with a sleeve 322. The sleeve 322 is provided outside the support column 320 with a gap between them. The inner surface of the sleeve 322 is evenly provided with four fifth openings 3220. The fifth openings 3220 have a triangular cross section. The inner surface of the sleeve 322 is evenly provided with four rows of ratchet teeth 3221. A retaining ring 323 is sleeved on the outside of the driven gear 32. A connecting rod 324 is symmetrically provided on the retaining ring 323. The connecting rod 324 is connected to the inner surface of the fusion device 1, thereby supporting the driven gear 32 and allowing the driven gear 32 to rotate around the retaining ring 323.The lifting part 4 is disposed between the support column 320 and the sleeve 322 of the driven gear 32. The inner surface of the lifting part 4 is provided with a sixth thread 40 that meshes with the fifth thread 321. The outer surface of the lifting part 4 is evenly provided with four second limiting blocks 41. The second limiting blocks 41 can be engaged in the fifth opening 3220 and move up and down. The outer surface of the lifting part 4 is evenly provided with four sixth openings 42. A spring 420 is correspondingly connected in the sixth opening 42. The other end of the spring 420 is connected to a pushing block 421. The pushing block 421 is away from the spring 420. One end of 20 is connected to a third limiting block 422, which is hemispherical in shape. The third limiting block 422 extends out of the sixth opening 42 and contacts the ratchet 3221, thereby limiting the lifting part 4. The lifting part 4 is provided with a fixing part 43, which extends through the third opening 12 on the fusion device 1 and into the interior of the fusion device 1. Simultaneously, a fourth limiting block 430, triangular in shape, is provided on the surface of the fixing part 43. The fourth limiting block 430 contacts the upper and lower vertebral lamina to enhance the fixation of the fusion device 1.

[0024] like Figure 1 The diagram shows an intervertebral fusion device, comprising a fusion device 1, which is a hollow shell. The upper and lower surfaces of the fusion device 1 are symmetrically provided with second openings 11 penetrating the outer surface of the fusion device. Two first limiting blocks 13 are provided at diagonal ends of the upper and lower surfaces of the fusion device 1. The first limiting blocks 13 have an arc-shaped cross-section. Sliding parts 2 are initially symmetrically arranged on the upper and lower surfaces of the fusion device 1. Rotating blocks 20 are symmetrically arranged between the sliding parts 2. The rotating blocks 20 can pass through the second openings 11 and connect with the sliding parts 2, rotating within the second openings 11. During rotation, the rotating blocks 20 can drive the sliding parts 2 to rotate 90°, causing the sliding parts 2 to rotate from the upper and lower surfaces of the fusion device 1 to the side of the fusion device 1. The upper and lower parts of the sliding parts 2 are obliquely symmetrically provided with fourth openings 22. The first limiting blocks 13 can be inserted into the fourth openings 22 to limit the sliding parts 2. A screw 30 is disposed inside the fusion device 1 and can rotate to drive the rotating blocks 20 to rotate.

[0025] like Figure 2The image shows a cross-sectional view of an intervertebral fusion device, including a fusion device 1, which is a hollow shell. Sliding parts 2 are initially symmetrically arranged on the upper and lower surfaces of the fusion device 1. Rotating blocks 20 are symmetrically arranged between the sliding parts 2. A transmission part 3 is disposed inside the fusion device 1. The transmission part 3 includes a screw 30, on which a second thread 300 and a third thread 301 are provided. During rotation, the screw 30 drives the rotating blocks 20 to rotate. The third thread 301 is disposed between the two second threads 300, and only begins to rotate after the second threads 300 have completed their stroke. A drive gear 31 is sleeved on the screw 30. A fourth thread 310 is provided in the middle of the drive gear 31, meshing with the third thread 301. Driven gears 32 mesh on both sides of the drive gear 31, and lifting parts 4 are correspondingly provided inside the driven gears 32.

[0026] like Figure 3 The diagram shows a fusion device 1, which is a hollow shell. A circular first opening 10 is provided on the side of the fusion device 1. At the same time, second openings 11 that penetrate the outer surface of the fusion device are symmetrically provided on the upper and lower surfaces of the fusion device 1. A third opening 12 that penetrates the surface of the fusion device 1 is provided between the second openings 11. Two first limiting blocks 13 are provided at the diagonal ends of the fusion device 1. The cross-section of the first limiting block 13 is an arc surface.

[0027] like Figure 4 As shown: The sliding part 2 has a circular arc cross-section, which reduces friction when the sliding part 2 contacts the vertebral plate. Rotating blocks 20 are symmetrically arranged between the sliding parts 2. A first thread 21 is provided in the middle of the rotating block 20. A fourth opening 22 is obliquely symmetrically arranged at the diagonal ends of the upper and lower parts of the sliding part 2.

[0028] like Figure 5 As shown: A cylindrical support column 320 is provided on the driven gear 32. The outer surface of the support column 320 is provided with a fifth thread 321. A sleeve 322 is also provided on the driven gear 32. The sleeve 322 is located outside the support column 320, with a gap between them. Four fifth openings 3220 are evenly provided on the inner surface of the sleeve 322. The fifth openings 3220 have a triangular cross-section. Four rows of ratchet teeth 3221 are evenly provided on the inner surface of the sleeve 322. A retaining ring 323 is sleeved on the outside of the driven gear 32. Connecting rods 324 are symmetrically provided on the retaining ring 323. The driven gear 32 can rotate around the retaining ring 323.

[0029] like Figure 6As shown: the inner surface of the lifting part 4 is provided with a sixth thread 40, the outer surface of the lifting part 4 is provided with four second limiting blocks 41 evenly, the outer surface of the lifting part 4 is provided with four sixth openings 42 evenly, the lifting part 4 is provided with a fixing part 43, the fixing part 43 can pass through the third opening 12 on the fusion device 1 and thus extend into the interior of the fusion device 1, and at the same time, the surface of the fixing part 43 is provided with a fourth limiting block 430, the fourth limiting block 430 being triangular in shape.

[0030] like Figure 7 As shown: A spring 420 is connected to the sixth opening 42, and a push block 421 is connected to the other end of the spring 420. A third limiting block 422 in the shape of a hemisphere is connected to the end of the push block 421 away from the spring 420.

[0031] When using this invention, the specific technical effects brought about by the embodiments are as follows: In the initial state, the sliding part is located on the upper and lower surfaces of the fusion device, the lifting part is retracted inside the fusion device, and the fixing part does not protrude from the third opening of the fusion device, so the intervertebral fusion device is in a sliding low-friction state; during the implantation of the intervertebral fusion device, because the sliding part is arc-shaped, it can reduce friction when in contact with the upper and lower vertebral lamina to avoid bone wear. After the implantation is completed and the position is confirmed, the screw is rotated. The rotating screw first contacts the rotating block, and the second thread on the screw meshes with the first thread on the rotating block. The screw drives the rotating block to rotate. The rotating block rotates within the second opening on the surface of the fusion unit, thereby driving the sliding parts located on the upper and lower surfaces of the fusion unit to rotate. The sliding parts rotate from the upper and lower surfaces of the fusion unit to the side surface of the fusion unit. When the sliding parts rotate 90° to the side surface of the fusion unit, the second thread stroke on the screw ends, and at the same time, the fourth opening on the sliding parts is precisely engaged with the first limiting block on the side of the fusion unit, limiting the sliding parts. When the sliding parts rotate to their final position and are engaged by the first limiting block, the second thread disengages from the first thread. At this time, the screw continues to rotate, but this section is a smooth rod, and the rotating block is no longer driven. Subsequently, the third thread begins to engage with the driving gear. The fourth thread of the wheel contacts and engages, entering the next driving stage. The driving gear rotates with the rotation of the screw, and the driving gear drives the driven gear to rotate. The lifting part is located between the support column and the sleeve. The support column rotates with the rotation of the driven gear, thereby driving the lifting part sleeved on the outer surface of the support column to rotate. Since the second limiting block on the outer surface of the lifting part engages with the fifth opening of the sleeve, the lifting part will only rise slowly in a straight line. During the rising process of the lifting part, the hemispherical surface of the third limiting block contacts the inclined surface of the ratchet and is compressed back into the sixth opening, without hindering the lifting; when the lifting... When the lifting part stops rising or is subjected to downward pressure, the flat surface of the third limiting block immediately abuts against the vertical surface of the ratchet, forming a one-way lock. This ensures that the height after lifting does not drop due to gravity or postoperative pressure, guaranteeing the long-term stability of the fixation effect. During the lifting process, the fixing part is driven to rise and extend out of the third opening of the fusion device until the fourth limiting block on the fixing part contacts the upper and lower endplates to enhance fixation. At this time, the screw stops rotating, and the driving gear and driven gear stop rotating accordingly. The third limiting block of the lifting part is pushed out of the sixth opening and blocked by the ratchet, thereby limiting the lifting part and preventing it from falling.

[0032] In summary, this invention improves upon conventional interbody fusion devices by incorporating a sliding part and a fixing part. This achieves a low-friction state between the interbody fusion device and the upper and lower lamina during implantation. After implantation, the sliding part can be rotated to the side of the fusion device, and the fixing part can be raised to contact the upper and lower lamina, thereby fixing the interbody fusion device. Therefore, this invention can reduce bone friction during the implantation of the interbody fusion device and alleviate patient pain.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 fusion device (1) is a hollow shell. A first opening (10) is provided on the side of the fusion device (1). A second opening (11) penetrating the outer surface is symmetrically provided on the upper and lower surfaces of the fusion device (1). A third opening (12) is provided between the second openings (11). Two first limiting blocks (13) are provided at the diagonal ends of the fusion device (1). The cross section of the first limiting block (13) is an arc surface. The sliding part (2) is symmetrically arranged on the upper and lower surfaces of the fusion device (1). The cross section of the sliding part (2) is an arc surface. Rotating blocks (20) are symmetrically arranged between the sliding parts (2). The rotating blocks (20) are provided with a first thread (21) in the middle. The rotating blocks (20) can pass through the second opening (11) and connect with the sliding part (2) and rotate in the second opening (11). The upper and lower parts of the sliding part (2) are obliquely symmetrically provided with a fourth opening (22). The first limiting block (13) can be inserted into the fourth opening (22) to limit the sliding part (2). The transmission part (3) is disposed inside the fusion unit (1). The transmission part (3) includes a screw (30). The screw (30) can pass through the first opening (10) and extend into the fusion unit (1). The screw (30) is provided with a second thread (300) and a third thread (301). The second thread (300) and the third thread (301) have different pitches. The first thread (21) in the middle of the rotating block (20) meshes with the second thread (300) on the screw (30). A drive gear (31) is sleeved on the screw (30). The driving gear (31) is provided with a fourth thread (310) in the middle. The third thread (301) meshes with the fourth thread (310) on the driving gear (31). The third thread (301) is located between two second threads (300). After the second thread (300) has completed its stroke, the third thread (301) starts to drive the fourth thread (310) to rotate. The driving gear (31) is meshed with a driven gear (32). The driven gear (32) is provided with a support column (320). The outer surface of the support column (320) is provided with a fifth thread (321). The lifting part (4) is sleeved on the outer surface of the support column (320). The inner surface of the lifting part (4) is provided with a sixth thread (40) that meshes with the fifth thread (321). The upper part of the lifting part (4) is provided with a fixing part (43) that can pass through the third opening (12) and thus extend into the fusion device (1).

2. The interbody fusion device according to claim 1, characterized in that, A sleeve (322) is also provided on the driven gear (32). The sleeve (322) is located outside the support column (320) with a gap between them. Four fifth openings (3220) are evenly provided on the inner surface of the sleeve (322). The fifth opening (3220) has a triangular cross section. Four rows of ratchet teeth (3221) are evenly provided on the inner surface of the sleeve (322). A retaining ring (323) is sleeved on the outside of the driven gear (32). A connecting rod (324) is symmetrically provided on the retaining ring (323). The connecting rod (324) is connected to the inner surface of the fusion device (1).

3. The interbody fusion device according to claim 2, characterized in that, The lifting part (4) is disposed between the support column (320) and the sleeve (322). Four second limiting blocks (41) are evenly disposed on the outer surface of the lifting part (4). The second limiting blocks (41) can be inserted into the fifth opening (3220) and move up and down. Four sixth openings (42) are evenly disposed on the outer surface of the lifting part (4). A fourth limiting block (430) is disposed on the surface of the fixing part (43).

4. The interbody fusion device according to claim 3, characterized in that, A spring (420) is connected to the sixth opening (42). A push block (421) is connected to the other end of the spring (420). A third limiting block (422) in the shape of a hemisphere is connected to the end of the push block (421) away from the spring (420). The third limiting block (422) can extend out of the sixth opening (42) and contact the ratchet (3221) to limit the lifting part (4).

5. The interbody fusion device according to claim 1, characterized in that, At least a portion of the sliding part (2) is made of a porous biocompatible material with a porosity of 50% to 85%, which is used to induce bone tissue ingrowth.

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