An intervertebral fusion device

Abstract

This disclosure relates to the field of medical device technology, specifically to an intervertebral fusion device, comprising a base plate, the base plate including a first base plate and a second base plate, the first base plate and the second base plate being disposed vertically opposite each other; a first connecting post, the first connecting post being pivotally connected to one of the base plates in a vertically floating manner to provide a degree of freedom of relative vertical movement between the first base plate and the second base plate, and a degree of freedom of rotation relative to a pivot axis along a plane parallel to the first base plate. It can adjust different heights and angles for patients with different intervertebral spaces, can rotate appropriately with the patient's vertebral body movement, has a strong bonding force with the vertebral body, and can be stably fixed between vertebral segments, ultimately achieving a balance between segmental fusion and segmental freedom.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and more specifically to an intervertebral fusion device. Background Technology

[0002] Intervertebral fusion is a fundamental surgical procedure for treating cervical spine diseases. It primarily aims to relieve pressure and pain by removing the intervertebral disc. However, disc removal can cause spinal instability, leading to the concept of cervical and lumbar intervertebral fusion. Initially, autologous bone was used to fill the removed intervertebral space; however, autologous bone grafting has drawbacks such as difficulty in bone harvesting and limited postoperative load-bearing capacity. Currently, biocompatible materials such as PEEK (polyetheretherketone) are commonly used to replace autologous bone for intervertebral space separation and fusion.

[0003] Because the conventional fusion cage cannot achieve self-fixation, it needs to be used in conjunction with internal fixation systems such as pedicle screws to ensure stability in the early stages of implantation. The holding force of a single screw is limited and the holding direction is singular. Fixing with multiple screws increases the surgical trauma area and carries the risk of postoperative screw loosening or even the fusion cage failing to fix and exiting the intervertebral space.

[0004] Internal fixation with titanium plate fusion device involves first implanting the fusion device body into the intervertebral space, then placing a titanium plate in front of the vertebral body at the implantation segment, and using screws to fix the titanium plate in front of or to the side of the vertebral body. This not only solves the risk of fusion device dislodgement, but also provides immediate stability to the fused segment. However, this procedure is complex. Postoperatively, because the titanium plate reserved in front of or to the side of the spine occupies a certain space, it can cause compression of adjacent organs, and patients often experience a significant foreign body sensation, which is a common postoperative symptom of this procedure.

[0005] Zero-notch fusion cages with clamps or screws involve placing the fusion cage body in the intervertebral space first, and then fixing the fusion cage between the upper and lower vertebral bodies with screws or clamps. This procedure is called zero-notch because there is no foreign body protruding from the intervertebral space. However, the upper and lower vertebral bodies and the fusion cage are rigidly connected, and the fused segment loses its freedom of movement. Especially after multi-stage fusion cages, patients will experience symptoms such as difficulty turning over.

[0006] Furthermore, because patients have different vertebral body injury sites and corresponding intervertebral space heights, it is necessary to design, manufacture, and produce fusion devices of different specifications and heights to meet the needs of different patients. This increases the production cost of fusion devices and is not conducive to the long-term development of the fusion device market. Summary of the Invention

[0007] This disclosure is made based on the aforementioned needs of the prior art. The technical problem to be solved by this disclosure is to provide an intervertebral fusion device that can adjust its height and angle to match the different intervertebral space heights and angles of different patients.

[0008] To address the aforementioned problems, the technical solutions provided in this disclosure include:

[0009] An intervertebral fusion device is provided, comprising: a substrate, the substrate including a first substrate and a second substrate, the first substrate and the second substrate being disposed vertically opposite each other; a first connecting post, the first connecting post being pivotally connected to one of the substrates in a vertically floating manner to provide a degree of freedom of relative vertical floating motion between the first substrate and the second substrate, and a degree of freedom of rotation relative to a pivot axis along a plane parallel to the first substrate.

[0010] The above configuration enables vertical floating and pivoting between the first substrate and the second substrate, wherein the degrees of freedom for vertical floating and pivoting are provided by the first connecting post.

[0011] Preferably, the first connecting post includes an abutment portion and a threaded portion, the threaded portion being threadedly connected to another substrate; and a first elastic member disposed between one of the substrates and the abutment portion to provide a preload for the threaded connection.

[0012] The first elastic element is compressed between the first substrate and the abutment to provide preload for the threaded connection between the threaded portion and the second substrate, thereby securing the connection between the threaded portion and the second substrate to prevent the intervertebral fusion device from loosening.

[0013] Preferably, one of the substrates is a first substrate, the other substrate is a second substrate, and the first substrate is disposed above the second substrate.

[0014] This setting allows for easy adjustment.

[0015] Preferably, the first substrate has a countersunk hole; the first connecting post passes through the countersunk hole, and the upper surface of the countersunk hole is connected to one end of the first elastic member; the other end of the first elastic member is connected to the lower surface of the abutment portion.

[0016] The above-mentioned configuration provides freedom for the up-and-down floating and pivoting of the first connecting column, while also providing a certain degree of strength.

[0017] Preferably, the first substrate is provided with a groove extending along a predetermined path; the intervertebral fusion device further includes a plurality of second connecting posts; one end of the second connecting post is fixedly connected to the second substrate, and the other end is at least partially disposed in the groove to slide along the predetermined path.

[0018] This configuration provides a path for the rotation of one end of the second connecting post, thereby causing changes in the angle and height between the first substrate and the second substrate, while also providing conditions for the pivoting movement of the first substrate.

[0019] Preferably, the groove includes multiple parts, each part including a first sidewall disposed at a first position on the path and a second sidewall disposed at a second position on the path; a second connecting post is disposed in each part; and a second elastic member is disposed between the second connecting post and the first sidewall, and between the second connecting post and the second sidewall; to provide a restoring force for the sliding of the connecting post in the groove.

[0020] By setting a second elastic element in the groove and connecting the second elastic element to the second connecting post, the first substrate can rotate relative to the second substrate along the plane of the first substrate, and at the same time generate a driving force for centering, which has a certain orthodontic ability for spinal deformation.

[0021] Preferably, the second connecting post includes: a body disposed along a first direction, the body including a housing, the inner sidewall of the housing having a first thread; and a first component partially disposed inside the housing, the outer sidewall of the first component having a second thread, the second thread being adapted to the first thread; a second component disposed inside the housing and extending along the first direction, one end of the second component having a first gear, the first gear having a central axis extending along the first direction and a gear extending downward around the central axis; and an adjusting part disposed along a second direction, one end of the adjusting part having an adjusting groove, the other end having a second gear, the second gear having a central axis extending along the second direction and a gear extending around the central axis and away from the central axis; the first gear and the second gear meshing with each other; when the adjusting part rotates around its central axis extending along the second direction, the first component will extend or shorten along the first direction.

[0022] By converting the lateral rotation into longitudinal elongation and shortening through the above settings, the angle and distance between the first and second substrates are changed, so that the intervertebral fusion device is adapted to the intervertebral space.

[0023] Preferably, the substrate is provided with an insertion port; and a fixing clip is disposed in the insertion port, thereby connecting to the substrate.

[0024] This configuration allows the fixation clip to connect to the base plate, providing stability for the fusion of the interbody fusion device and the vertebral body.

[0025] Preferably, clamping portions are provided on the left and right sides of the substrate; the insertion port is located in the middle of the substrate in the left-right direction and is spaced apart from the clamping portions on the left and right sides; the adjusting portion has an adjusting groove, which is disposed opposite to the gap so as to operate the adjusting groove through the gap.

[0026] This design allows for easy adjustment of the adjustment groove to fit the intervertebral fusion device to the intervertebral space.

[0027] Preferably, the fixing clip is connected to the insertion port, and the fixing clip includes: a first fixing clip having a first chamber that extends vertically, and fixing teeth are provided on the upper and lower outer surfaces of the first fixing clip, with the openings of the fixing teeth facing the bottom of the first fixing clip; a second fixing clip having a second chamber that extends vertically, the second fixing clip being selectively disposed within the first chamber, and barbs being provided on the left and right sides of the second fixing clip, with the barbs facing the bottom of the second fixing clip; the length of the second fixing clip is greater than that of the first fixing clip; and a third fixing clip being selectively disposed within the chamber of the second fixing clip, the length of the third fixing clip being greater than that of the second fixing clip.

[0028] By setting anti-slip devices, such as barbs and grooves, in different directions on different devices, the intervertebral fusion cage can be fixed in the intervertebral space, providing a stable environment for the fusion of the intervertebral fusion cage and the vertebral body.

[0029] Preferably, the first fixing clamp has two parallel but non-connected first chambers and second chambers; the first chamber has a first groove, and the outer wall of the second fixing clamp has a first protrusion, the first groove being adapted to the first protrusion; the second chamber has a second groove, and the outer wall of the third fixing clamp has a second protrusion, the second groove being adapted to the second protrusion.

[0030] The combined effect of the grooves and protrusions can extend the length of the fixation clip, allowing for the stacking of clips to accommodate different vertebral bone types for a stronger gripping effect.

[0031] Preferably, the substrate includes a support surface for contacting the spine; the support surface includes a plurality of side-by-side base units with different heights and their sidewalls contacting each other to form an array.

[0032] By increasing the friction between the support surface and the vertebral bone contact surface through the above methods, slippage during fusion can be reduced to some extent.

[0033] This disclosure also provides an intervertebral fusion device, comprising: a substrate, the substrate including a support surface for contacting the spine, the support surface including a plurality of abutment units arranged side by side, the abutment units having different heights and their sidewalls contacting each other to form an array; the substrate including a first substrate and a second substrate, the first substrate and the second substrate being disposed vertically opposite each other; a first connecting post, the first connecting post being pivotally connected to one of the substrates in a vertically floating manner to provide a degree of freedom of relative vertical floating motion between the first substrate and the second substrate, and a degree of freedom of rotation relative to a pivot axis along a plane parallel to the first substrate.

[0034] The above configuration enables vertical floating and pivoting between the first and second substrates, with the degrees of freedom for vertical floating and pivoting provided by the first connecting post. The increased friction between the support surface and the vertebral bone contact surface on the substrate surface helps reduce slippage during fusion to some extent.

[0035] Preferably, the first connecting post includes an abutment portion and a threaded portion, the threaded portion being threadedly connected to another substrate; and a first elastic member disposed between one of the substrates and the abutment portion to provide a preload for the threaded connection.

[0036] The first elastic element is compressed between the first substrate and the abutment to provide preload for the threaded connection between the threaded portion and the second substrate, thereby securing the connection between the threaded portion and the second substrate to prevent the intervertebral fusion device from loosening.

[0037] Preferably, one of the substrates is a first substrate, the other substrate is a second substrate, and the first substrate is disposed above the second substrate.

[0038] This setting allows for easy adjustment.

[0039] Preferably, the first substrate has a countersunk hole; the first connecting post passes through the countersunk hole, and the upper surface of the countersunk hole is connected to one end of the first elastic member; the other end of the first elastic member is connected to the lower surface of the abutment portion.

[0040] The above-mentioned configuration provides freedom for the up-and-down floating and pivoting of the first connecting column, while also providing a certain degree of strength.

[0041] Preferably, the first substrate is provided with a groove extending along a predetermined path; the intervertebral fusion device further includes a plurality of second connecting posts; one end of the second connecting post is fixedly connected to the second substrate, and the other end is at least partially disposed in the groove to slide along the predetermined path.

[0042] This configuration provides a path for the rotation of one end of the second connecting post, thereby causing changes in the angle and height between the first substrate and the second substrate, while also providing conditions for the pivoting movement of the first substrate.

[0043] Preferably, the groove includes multiple parts, each part including a first sidewall disposed at a first position on the path and a second sidewall disposed at a second position on the path; a second connecting post is disposed in each part; and a second elastic member is disposed between the second connecting post and the first sidewall, and between the second connecting post and the second sidewall; to provide a restoring force for the sliding of the connecting post in the groove.

[0044] By setting a second elastic element in the groove and connecting the second elastic element to the second connecting post, the first substrate can rotate relative to the second substrate along the plane of the first substrate, and at the same time generate a driving force for centering, which has a certain orthodontic ability for spinal deformation.

[0045] Preferably, the second connecting post includes: a body disposed along a first direction, the body including a housing, the inner sidewall of the housing having a first thread; and a first component partially disposed inside the housing, the outer sidewall of the first component having a second thread, the second thread being adapted to the first thread; a second component disposed inside the housing and extending along the first direction, one end of the second component having a first gear, the first gear having a central axis extending along the first direction and a gear extending downward around the central axis; and an adjusting part disposed along a second direction, one end of the adjusting part having an adjusting groove, the other end having a second gear, the second gear having a central axis extending along the second direction and a gear extending around the central axis and away from the central axis; the first gear and the second gear meshing with each other; when the adjusting part rotates around its central axis extending along the second direction, the first component will extend or shorten along the first direction.

[0046] By converting the lateral rotation into longitudinal elongation and shortening through the above settings, the angle and distance between the first and second substrates are changed, so that the intervertebral fusion device is adapted to the intervertebral space.

[0047] Preferably, the substrate is provided with an insertion port; and a fixing clip is disposed in the insertion port, thereby connecting to the substrate.

[0048] This configuration allows the fixation clip to connect to the base plate, providing stability for the fusion of the interbody fusion device and the vertebral body.

[0049] Preferably, clamping portions are provided on the left and right sides of the substrate; the insertion port is located in the middle of the substrate in the left-right direction and is spaced apart from the clamping portions on the left and right sides; the adjusting portion has an adjusting groove, which is disposed opposite to the gap so as to operate the adjusting groove through the gap.

[0050] This design allows for easy adjustment of the adjustment groove to fit the intervertebral fusion device to the intervertebral space.

[0051] Preferably, the fixing clip is connected to the insertion port, and the fixing clip includes: a first fixing clip having a first chamber that extends vertically, and fixing teeth are provided on the upper and lower outer surfaces of the first fixing clip, with the openings of the fixing teeth facing the bottom of the first fixing clip; a second fixing clip having a second chamber that extends vertically, the second fixing clip being selectively disposed within the first chamber, and barbs being provided on the left and right sides of the second fixing clip, with the barbs facing the bottom of the second fixing clip; the length of the second fixing clip is greater than that of the first fixing clip; and a third fixing clip being selectively disposed within the chamber of the second fixing clip, the length of the third fixing clip being greater than that of the second fixing clip.

[0052] By setting anti-slip devices, such as barbs and grooves, in different directions on different devices, the intervertebral fusion cage can be fixed in the intervertebral space, providing a stable environment for the fusion of the intervertebral fusion cage and the vertebral body.

[0053] Preferably, the first fixing clamp has two parallel but non-connected first chambers and second chambers; the first chamber has a first groove, and the outer wall of the second fixing clamp has a first protrusion, the first groove being adapted to the first protrusion; the second chamber has a second groove, and the outer wall of the third fixing clamp has a second protrusion, the second groove being adapted to the second protrusion.

[0054] The combined effect of the grooves and protrusions can extend the length of the fixation clip, allowing for the stacking of clips to accommodate different vertebral bone types for a stronger gripping effect.

[0055] Compared with the prior art, this disclosure can adjust the height and angle of the intervertebral fusion device according to different intervertebral spaces, so that the adjusted intervertebral fusion device is adapted to the intervertebral space; it has a certain rotational ability to achieve relative rotation between the two base plates after fusion, without affecting the transmission of intervertebral stress; the upper and lower surfaces of the intervertebral fusion device of this disclosure adopt a biomimetic structure to make the fusion effect with the vertebral body more stable; the fixation clip for fixing to the vertebral bone in this disclosure has a multi-segment detachable structure to make different selections for different contact bone materials, so as to have a stronger holding ability. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.

[0057] Figure 1 This is a three-dimensional structural diagram of the interbody fusion device disclosed herein;

[0058] Figure 2 This is a three-dimensional structural diagram of the second substrate of the interbody fusion device disclosed herein;

[0059] Figure 3 This is a three-dimensional structural diagram of the first substrate of the interbody fusion device disclosed herein;

[0060] Figure 4 This is a schematic cross-sectional view of the interbody fusion device disclosed herein;

[0061] Figure 5 This is a three-dimensional structural diagram of the second connecting column of this disclosure;

[0062] Figure 6 This is a cross-sectional schematic diagram of the second connecting column of this disclosure;

[0063] Figure 7 This is a partial bottom view of the second connecting column of this disclosure;

[0064] Figure 8 This is a partial three-dimensional structural diagram of the second connecting column of this disclosure;

[0065] Figure 9 This is a three-dimensional structural diagram of the interbody fusion device disclosed herein from another angle;

[0066] Figure 10 This is a three-dimensional structural diagram of the fixing clip disclosed herein;

[0067] Figure 11 This is a cross-sectional three-dimensional structural diagram of the fixing clip disclosed herein.

[0068] Figure label:

[0069] 1. First substrate; 101. First support surface; 2. Second substrate; 201. Second support surface; 3. First connecting post; 301. Abutting part; 302. Threaded part; 4. Second connecting post; 4A. First direction; 4B. Second direction; 401. Adjustment part; 401A. Second gear; 402. Housing; 402A. First thread; 403. First component; 403A. First gear; 404. Second component; 404A. Second thread; 5. First elastic element; 6. 7. Second elastic element; 8. Third groove; 9. Fourth groove; 10. First part; 11. Countersunk hole; 12. Groove; 13. Fixing clip; 14. First fixing clip; 15. Fixing tooth; 16. First groove; 17. Second fixing clip; 18. Barb; 19. First protrusion; 10. Second groove; 10. Third fixing clip; 10. Second protrusion; 10. Clamping hole; 11. Clamping groove; 12. Insertion port. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0071] In the description of the embodiments of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0072] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.

[0073] To facilitate understanding of the embodiments of this application, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application.

[0074] The cartilaginous connection between the vertebral bodies of two adjacent vertebrae is called an intervertebral disc. It consists of an outer annulus fibrosus and a central nucleus pulposus. The fusion device described in this disclosure is an intervertebral fusion device with a certain degree of adjustability, suitable for implantation in a patient to replace the intervertebral disc.

[0075] This embodiment provides an interbody fusion device, referring to... Figures 1-11 .

[0076] Reference Figure 1 The intervertebral fusion device includes a base plate, a connector, and a fixing clip 10.

[0077] Reference Figures 2-4 The substrate includes a first substrate 1 and a second substrate 2, which are arranged vertically opposite each other. The connector is disposed between the first substrate 1 and the second substrate 2, with one end connected to the first substrate 1 and the other end connected to the second substrate 2.

[0078] In this embodiment, the first substrate 1 is located above the second substrate 2.

[0079] The first substrate 1 includes a first support surface 101, which replaces the upper surface of the injured intervertebral disc and is bonded to the lower surface of the preceding vertebral body. Correspondingly, the second substrate 2 includes a second support surface 201, which replaces the lower surface of the injured intervertebral disc and is bonded to the upper surface of the next vertebral body.

[0080] Furthermore, the substrate is provided with an insertion port 13 for the fixing clip 10. The insertion port 13 includes an outlet and an inlet. The inlet is located near the edge of the supporting surface, and the outlet is located on the side wall of the substrate. Clamping portions are provided at both ends of the same side wall. Further, the clamping portions include clamping holes 11 and clamping grooves 12, both used for implanting the intervertebral fusion device. Both the clamping holes 11 and the clamping grooves 12 are spaced apart from the outlet.

[0081] Specifically, the inner wall of the clamping hole 11 is provided with threads. After one end of the clamping tool is stably connected to the threads in the clamping hole, its other end contacts the clamping groove 12, thereby clamping the entire intervertebral fusion device to insert it into the corresponding intervertebral space.

[0082] Reference Figure 1 and Figure 9The surfaces of the first support surface 101 and the second support surface 201 are biomimetic structures inspired by tree frog toe epithelial cells, simplified into hexagonal abutments. They are arranged at intervals, ensuring that each abutment structure does not interfere with the others, and the height distribution of each abutment is uniform, thus making the fusion between the intervertebral fusion device and the vertebra more stable. There is a height difference between the abutments, and the arrangement of the abutments with height differences follows a certain regularity. In one embodiment of this invention, the abutments include two types of abutments with different heights, which can be distributed laterally or longitudinally. That is, a taller abutment is arranged in a column, with the abutments in the adjacent column being of lower height; or a taller abutment is arranged in a row, with the abutments in the adjacent row being of lower height. Alternatively, they can be arranged such that a taller abutment is surrounded by a lower-height abutment, i.e., adjacent abutments have different heights. The above arrangement methods can evenly distribute the hexagonal abutment, making it more stably integrated with the vertebrae. At the same time, the different heights of the structure can play a role in preventing slippage, and can effectively prevent the intervertebral fusion device from sliding between the vertebrae when it is not fused.

[0083] By designing the surface morphology of the support surface, the intervertebral fusion device has a stronger bonding ability with the vertebral body, thereby ensuring stability in the initial stage of fusion.

[0084] Because there is a certain angle between the vertebrae in the human body, in order to better adapt the intervertebral fusion device of this disclosure to the vertebral environment, reduce the patient's foreign body sensation, and improve adaptability, the angle between the upper and lower plates of the intervertebral fusion device is adapted to the angle between the two vertebrae to be inserted. Since the intervertebral spaces differ among different patients, the intervertebral fusion device of this disclosure can achieve good adaptability between the intervertebral fusion device and the intervertebral space by adjusting its height and angle.

[0085] To achieve the above effects, a connector is provided between the first substrate 1 and the second substrate 2. By providing the connector, the angle and height of the intervertebral fusion device are adapted to the intervertebral space, and the first substrate 1 and the second substrate 2 can be rotated within a certain adjustment range, thereby adapting to the movement of the human spine.

[0086] The connector includes a first connecting post 3 and a second connecting post 4. Adjusting the height of the interbody fusion device requires the combined action of the first connecting post 3 and the second connecting post 4, while adjusting the angle of the device is accomplished by the second connecting post 4. Specifically, the first connecting post 3 connects the first substrate 1 and the second substrate 2, and adjusts and controls the height of the interbody fusion device; multiple second connecting posts 4 are present, and their heights are adjusted to change the height between the two substrates and the angle between them.

[0087] The first connecting post 3 is pivotally connected to one of the substrates, allowing for vertical floating, to provide a degree of freedom for relative vertical floating between the first substrate 1 and the second substrate 2, and a degree of freedom for rotation relative to a pivot along a plane parallel to the first substrate 1. The first connecting post 3 is located at the center of the substrates and includes an abutment portion 301 and a threaded portion 302. One end of the first connecting post 3 is connected to the first substrate 1, and the other end is connected to the second substrate 2.

[0088] Reference Figure 4 The abutment portion 301 is located above the threaded portion 302, and the diameter of the abutment portion 301 is larger than the diameter of the threaded portion 302. The top surface of the first elastic member 5 is connected to the bottom surface of the abutment portion 301.

[0089] A third groove 7 is provided at the center of the second substrate 2. The sidewall of the third groove 7 is threaded. The threaded portion 302 has a threaded structure adapted to the thread, and the thread on the threaded portion 302 is engaged with the thread in the third groove 7. The first elastic member 5 is sleeved on the first connecting post 3. Its upper end is connected to the lower end of the abutment portion 301, and its lower end is connected to the upper surface of the first substrate 1. This arrangement provides a preload force for the threaded connection between the first connecting post 3 and the second substrate 2 to effectively prevent them from loosening. Specifically, the first substrate 1 includes a fourth groove 8, which includes a first portion 801 and a countersunk hole 802. The first portion 801 communicates with the countersunk hole 802 and is positioned above the countersunk hole 802. The first substrate 1 has an opening that communicates with the first portion 801. The diameter of the first portion 801 is larger than that of the countersunk hole 802, and the shape of the first portion 801 is adapted to the diameter of the abutment portion 301. In this embodiment, the diameter of the first portion 801 is the same as the shape of the abutment portion 301, and the depth of the first portion 801 includes the thickness of the abutment portion 301. The remaining portion houses the first elastic member 5, and the lower end of the first elastic member 5 abuts against the first portion 801 of the fourth groove 8. The countersunk hole 802 is used to pass through the threaded portion 302, and the diameter of the countersunk hole 802 is adapted to the diameter of the threaded portion 302. The countersunk hole 802 has a guiding effect on the first connecting post 3.

[0090] There are multiple second connecting posts 4, all of which are equidistant from the first connecting post 3. Furthermore, the distance between each second connecting post 4 and its adjacent counterpart is equal, and the second connecting posts 4 are arranged around the first connecting post 3. This arrangement ensures the stability and balance of the entire interbody fusion device. One end of each second connecting post 4 is fixed to the second base plate 2, and the other end is connected to the first base plate 1.

[0091] Reference Figures 5-8 The second connecting post 4 includes a main body and an adjusting part 401. The second connecting post 4 can be extended and retracted by rotating the adjusting part 401. Since the adjusting part 401 needs to adjust the state of the second connecting post 4 by rotation, it is exposed in an unobstructed position within the intervertebral fusion device. In one embodiment, the main body includes a housing 402, a first component 403, and a second component 404. The housing 402 extends along a first direction 4A, and the adjusting part 401 extends along a second direction 4B, which are perpendicular to each other. One end of the adjusting part 401 is exposed outside the housing 402 and includes an adjusting groove for rotating the adjusting part about a central axis extending along the second direction 4B. The other end of the adjusting part 401 is disposed inside the housing, and a second gear 401A is provided thereon. The central axis of the second gear 401A is disposed along the second direction 4B and extends outward from the end. Inside the housing 402 there is a first component 403 extending along a first direction 4A, and a first gear 403A is provided at its bottom end. The central axis of the first gear 403A is provided along the first direction 4A and extends downward toward the end so that the second gear 401A and the first gear 403A mesh with each other.

[0092] The inner wall of the housing 402 is provided with a first thread 402A, and a second component 404 extending along the second direction 4B is provided inside the housing 402. The outer wall of the second component 404 is provided with a second thread 404A that is adapted to the first thread 402A. The second component 404 is connected to the first component 403. When the first component 403 rotates laterally, the second component 404 rotates laterally accordingly, further driving the first thread 402A and the second thread 404A to move relative to each other, causing the second connecting post 4 to extend or retract into the housing 4.

[0093] When the adjusting part 401 is rotated, the second gear 401A drives the first gear 403A to rotate, thereby causing the first component 403 to rotate laterally. The rotation received from the outside world around a central axis set along the first direction 4A is converted into rotation around a central axis set along the second direction 4B. Furthermore, the longitudinal rotation from the outside world is converted into lateral rotation. The lateral rotation of the first component 403 drives the second component 404 to rotate accordingly, causing the first thread 402A and the second thread 404A to rotate, thereby achieving the extension or shortening of the second connecting post 4.

[0094] In one embodiment of this invention, three second connecting posts 4 are provided on the first substrate 1. The second connecting posts 4 are arranged around the first connecting post 3. The adjustment portion 401 of the second connecting post 4 is arranged facing the outside of the fusion device, so that when the fusion device is implanted, the height and angle of the fusion device can be changed by adjusting the adjustment portion 401 to better contact the vertebral bone. The adjustment grooves of two of the adjustment portions 401 are exposed between the insertion port 13 and the clamping hole 11 and between the insertion port 13 and the clamping groove 12, so that after the fusion device is implanted, the height of the second connecting post 4 can be adjusted to match the intervertebral space by inserting a corresponding device through the space between the insertion port 13 and the clamping hole 11 and between the insertion port 13 and the clamping groove 12.

[0095] Furthermore, the bottom surface of the first substrate 1 is provided with a groove 9, the groove 9 extends along a predetermined path, the groove includes multiple parts, the parts are not interconnected, each part includes a first sidewall disposed at a first position on the path and a second sidewall disposed at a second position on the predetermined path; a second connecting post is disposed in each part; and a second elastic member 6 is disposed between the second connecting post 4 and the first sidewall, and between the second connecting post 4 and the second sidewall; to provide a restoring force for the sliding of the connecting post in the groove 9.

[0096] One end of the second connecting post 4 is fixedly connected to the second substrate 2, and the other end is at least partially disposed in the groove 9 so as to slide along the predetermined path.

[0097] In this embodiment, multiple portions are arranged around the second elastic member 6. The two ends of the second elastic member 6 are fixedly connected to two opposite sidewalls of the portions, and one end of the second connecting post 4 is fixedly connected to the middle position of the second elastic member 6. Each portion of the groove corresponds one-to-one with the second elastic member 6; that is, three evenly distributed and non-connected portions centered on the first connecting post 3 are provided on the bottom surface of the substrate. The width of each portion is the same as the diameter of the portion of the second connecting post 4 within that portion.

[0098] This configuration allows the first substrate 1 to rotate relative to the second substrate 2 within a certain range when the intervertebral fusion device is subjected to lateral load. When the first substrate 1 and the second substrate 2 rotate relative to each other, the second elastic element 6 will bear a certain tensile stress, that is, when the first substrate 1 and the second substrate 2 rotate relative to each other, it can receive a driving force to return to its original position.

[0099] The second connecting post 4 is extended or shortened by rotating the adjustment part 401. When one or more of the multiple second connecting posts 4 are adjusted, the relative position between the first substrate 1 and the second substrate 2 changes. The changes include changes in the distance between the first substrate 1 and the second substrate 2 and changes in the tilt angle between them.

[0100] By adjusting the height and angle, the height of the interbody fusion device and the angle between the two base plates are made to correspond to the environment in which the interbody fusion device will be placed, so as to adapt the interbody fusion device to the different intervertebral spaces of different patients.

[0101] The intervertebral fusion device also includes a fixation clip 10, as shown in the reference. Figure 10 and Figure 11 The fixing clip 10 includes a first fixing clip 1001, a second fixing clip 1002, and a third fixing clip 1003. The lengths of the three fixing clips 10 increase sequentially, while their thicknesses and widths decrease sequentially.

[0102] The first fixing clip 1001 is connected to the insertion port 13 on the substrate, and its outer surface is provided with fixing teeth 1001A, the opening direction of which faces the bottom of the first fixing clip 1001. The interior of the first fixing clip 1001 has two non-communicating first chambers arranged in a left-right direction, and the chambers are connected vertically to allow passage of the second fixing clip 1002 and the third fixing clip 1003. Furthermore, a first groove 1001B is provided on the inner wall of the first fixing clip 1001, which is used for fixed connection with the second fixing clip 1002.

[0103] The second fixing clip 1002 can pass through the cavity of the first fixing clip 1001 and be fixed inside the first fixing clip 1001. Its outer side is provided with serrated barbs 1002A, with the barbs 1002A facing the bottom of the second fixing clip 1002. Furthermore, the second fixing clip 1002 is also provided with a structure adapted to the internal groove of the first fixing clip 1001. The outer first protrusion 1002C of this structure cooperates with the first groove 1001B of the first fixing clip 1001 to fix the second fixing clip 1002 inside the first fixing clip 1001. The interior of this structure is a second groove 1002D for fixing the third fixing clip 1003. Simultaneously, the second fixing clip 1002 also has a cavity that is vertically connected for the passage of the third fixing clip 1003.

[0104] The third fixing clip 1003 has a second protrusion 1003A that matches the second groove 1002D on the second fixing clip 1002, and the third fixing clip 1003 is fixed in the second fixing clip 1002 through the cooperation of the two.

[0105] After the first fixing clip 1001 is fitted with the second fixing clip 1002 and the third fixing clip 1003, the whole structure is Y-shaped.

[0106] The first fixing clip 1001 is necessary and is connected to the first base plate 1 and the second base plate 2 to fix the intervertebral fusion device in the intervertebral space. When the first fixing clip 1001 is too short to penetrate the vertebral body, the second fixing clip 1002 and the third fixing clip 1003 can be stacked to increase the length, and the second fixing clip 1002 is fixed to the vertebral body by the protrusion on the outside of the second fixing clip 1002 to prevent slippage.

[0107] In summary, this embodiment includes the following interbody fusion device structure:

[0108] A1. An interbody fusion device, characterized in that it comprises:

[0109] A substrate, the substrate including a support surface for contacting a spine, the support surface including a plurality of side-by-side abutment units having different heights and their sidewalls contacting each other to form an array;

[0110] The substrate includes a first substrate and a second substrate, wherein the first substrate and the second substrate are disposed vertically opposite to each other.

[0111] A first connecting post is pivotally connected to one of the substrates in a vertically floating manner to provide a degree of freedom of relative vertical floating motion between the first substrate and the second substrate, and a degree of freedom of rotation relative to a pivot along a plane parallel to the first substrate.

[0112] A2. The interbody fusion device according to claim A1, characterized in that,

[0113] The first connecting post includes an abutting portion and a threaded portion, the threaded portion being threadedly connected to another substrate;

[0114] as well as

[0115] A first elastic element is disposed between one of the substrates and the abutment to provide a preload for the threaded connection.

[0116] A3. An intervertebral fusion device according to claim A2, wherein one of the substrates is a first substrate, the other substrate is a second substrate, and the first substrate is disposed above the second substrate.

[0117] A4. An interbody fusion device according to claim A3, characterized in that...

[0118] The first substrate has a countersunk hole;

[0119] The first connecting post is inserted into the countersunk hole, and the upper surface of the countersunk hole is connected to one end of the first elastic element.

[0120] The other end of the first elastic member is connected to the lower surface of the abutment portion.

[0121] A5. An interbody fusion device according to claim A3, characterized in that...

[0122] The first substrate has a groove extending along a predetermined path;

[0123] The intervertebral fusion device also includes a plurality of second connecting posts; one end of the second connecting post is fixedly connected to the second base plate, and the other end is at least partially disposed in the groove to slide along the predetermined path.

[0124] A6. An interbody fusion device according to claim A5, characterized in that,

[0125] The groove includes multiple parts, each part including a first sidewall disposed at a first position on the path and a second sidewall disposed at a second position on the path; each part is provided with a second connecting post;

[0126] as well as

[0127] A second elastic element is disposed between the second connecting post and the first sidewall, and between the second connecting post and the second sidewall, to provide a restoring force for the sliding of the connecting post in the groove.

[0128] A7. An interbody fusion device according to claim A5, characterized in that the second connecting column comprises:

[0129] The main body, which is disposed along a first direction, includes...

[0130] A housing, wherein a first thread is provided on the inner sidewall of the housing;

[0131] as well as

[0132] A first component is partially disposed inside the housing, and a second thread is provided on the outer side wall of the first component, the second thread being adapted to the first thread;

[0133] The second component is disposed inside the housing and extends along the first direction. One end of the second component is provided with a first gear. The first gear has a central axis extending along the first direction and a gear extending downward around the central axis.

[0134] An adjustment part is provided along a second direction. One end of the adjustment part is provided with an adjustment groove, and the other end is provided with a second gear. The second gear has a central axis extending along the second direction and a gear surrounding the central axis and extending away from the central axis.

[0135] The first gear and the second gear mesh with each other;

[0136] When the adjustment part rotates about its central axis extending in the second direction, the first component will lengthen or shorten along the first direction.

[0137] A8. An interbody fusion device according to claim A7, characterized in that,

[0138] An insertion port is provided on the substrate;

[0139] as well as

[0140] A retaining clip is disposed in the insertion port, thereby connecting it to the substrate.

[0141] A9. An interbody fusion device according to claim A8, characterized in that,

[0142] Clamping portions are provided on the left and right sides of the substrate respectively; the insertion port is located in the middle of the substrate in the left-right direction and is spaced apart from the clamping portions on the left and right sides.

[0143] The adjustment part has an adjustment groove, which is disposed opposite to the interval so that the adjustment groove can be operated through the interval.

[0144] A10. An interbody fusion device according to claim A8, characterized in that the fixing clip is connected to the insertion port, and the fixing clip includes...

[0145] The first fixing clamp has a first chamber that runs vertically through it. Fixing teeth are provided on the upper and lower outer surfaces of the first fixing clamp, and the openings of the fixing teeth face the bottom of the first fixing clamp.

[0146] The second fixing clip has a second chamber that extends vertically. The second fixing clip can be selectively disposed within the first chamber. The left and right surfaces of the second fixing clip are provided with barbs, which face the bottom of the second fixing clip. The length of the second fixing clip is greater than that of the first fixing clip.

[0147] A third fixing clip may be optionally disposed within the cavity of the second fixing clip, and the length of the third fixing clip is greater than that of the second fixing clip.

[0148] A11. An interbody fusion device according to claim A10, characterized in that the first fixing clamp has two side-by-side, non-connected first and second chambers;

[0149] The first chamber is provided with a first groove, and the outer wall of the second fixing clip is provided with a first protrusion, and the first groove is adapted to the first protrusion;

[0150] The second chamber is provided with a second groove, and the outer wall of the third fixing clamp is provided with a second protrusion, the second groove and the second protrusion being adapted to each other.

[0151] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An intervertebral cage, comprising: The application relates to a substrate, a first connecting column, a second connecting column, a first elastic member, a second elastic member, a first fixed clip, a second fixed clip, a third fixed clip, and a second connecting column. The substrate comprises a first substrate and a second substrate, the first substrate and the second substrate are arranged oppositely, and the first substrate is arranged above the second substrate; a slot extending along a predetermined path is arranged on the first substrate; and an insertion opening is arranged on the substrate. The first connecting column is pivotally connected with the first substrate in an up-down floating manner to provide a degree of freedom of relative up-down floating movement between the first substrate and the second substrate and a degree of freedom of relative pivoting along a plane parallel to the first substrate. The first connecting column comprises an abutting portion and a threaded portion, the threaded portion is threadedly connected with the second substrate, and the first elastic member is arranged between the first substrate and the abutting portion to provide a pre-tightening force of the threaded connection. The first substrate has a counterbore, the first connecting column is arranged in the counterbore, an upper surface of the counterbore is connected with one end of the first elastic member, and the other end of the first elastic member is connected with a lower surface of the abutting portion. A plurality of second connecting columns are arranged, one end of each second connecting column is fixedly connected with the second substrate, and the other end of each second connecting column is at least partially arranged in the slot to slide along the predetermined path. The slot comprises a plurality of portions, each portion comprises a first side wall arranged at a first position on the path and a second side wall arranged at a second position on the path, and one second connecting column is arranged in each portion. A second elastic member is arranged between the second connecting column and the first side wall and between the second connecting column and the second side wall to provide a restoring force for the sliding of the connecting column in the slot. A fixed clip is arranged in the insertion opening and connected with the substrate, the fixed clip is connected with the insertion opening, and the fixed clip comprises a first fixed clip having a first cavity penetrating in an up-down direction, a plurality of fixed teeth are arranged on two outer surfaces of the first fixed clip in the up-down direction, and the fixed teeth are arranged to have openings facing the bottom of the first fixed clip. A second fixed clip having a second cavity penetrating in the up-down direction is arranged in the first cavity, the second fixed clip is arranged in the first cavity selectively, the surfaces on the left and right sides of the second fixed clip are arranged to have barbs facing the bottom of the second fixed clip, and the length of the second fixed clip is greater than that of the first fixed clip. A third fixed clip is arranged in the cavity of the second fixed clip selectively, and the length of the third fixed clip is greater than that of the second fixed clip. The second connecting column comprises a main body arranged in a first direction, the main body comprises a shell having a first thread arranged on the inner side wall of the shell, and a first component partially arranged in the shell, the outer side wall of the first component is arranged to have a second thread, and the second thread is matched with the first thread.

2. The intervertebral cage of claim 1, wherein, A second component is arranged in the shell and extends in the first direction, one end of the second component is arranged to have a first gear wheel having a central shaft extending in the first direction and a gear wheel extending downward around the central shaft. ​ ​ ​ ​ ​ An adjusting portion is arranged in the second direction, one end of the adjusting portion is provided with an adjusting groove, and the other end of the adjusting portion is provided with a second gear, the second gear has a central axis extending in the second direction and a gear surrounding the central axis and extending away from the direction in which the central axis is located; The first gear and the second gear are engaged with each other; When the adjusting portion rotates around the central axis extending in the second direction, the first part will be elongated or shortened along the first direction.

3. The intervertebral fusion cage according to claim 1, wherein: The left and right sides of the base plate are respectively provided with clamping portions; the insertion port is located in the middle of the left and right directions of the base plate and has a spacing between the clamping portions on the left and right sides; The adjusting portion has an adjusting groove, and the adjusting groove is arranged opposite to the spacing to operate the adjusting groove through the spacing.

4. The intervertebral implant as recited in claim 1, wherein, The first fixed clamp has two first and second chambers arranged side by side and not connected; The first chamber is provided with a first groove, and the outer side wall of the second fixed clamp is provided with a first protrusion, and the first groove is matched with the first protrusion; The second chamber is provided with a second groove, and the outer side wall of the third fixed clamp is provided with a second protrusion, and the second groove is matched with the second protrusion.

5. The intervertebral fusion cage according to claim 1, wherein: The base plate comprises a support surface to contact the spine; The support surface comprises a plurality of abutted base platform units, the base platform units have different heights, and the side walls thereof are in contact with each other to form an array.

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