A 3D-printed interbody fusion device

Abstract

This invention relates to the field of orthopedic implant technology, specifically to a 3D-printed interbody fusion device. The invention comprises a front-end expansion module and a rear-end expansion module. The rear-end expansion module is rotatably connected to the upper and lower expansion bodies via multiple rotating components, and a first limiting groove on a linkage component restricts the travel of a first rotating shaft rotatably connected to the rotating components, thereby limiting the rear-end expansion angle. The front-end expansion module, on the other hand, restricts the travel of a sliding component on the front-end moving component in both axial and height directions via a second limiting groove inclined on the lower expansion body, thus enabling simultaneous adjustment of angle and height during front-end expansion. When the first and second push rods are driven simultaneously, the cooperation between the sliding component and the second limiting groove, the rotating component and the rotating shaft, the first limiting groove, and the fourth rotating shaft and the third limiting groove achieves synchronous expansion of both ends of the expansion body.

Description

Technical Field

[0001] This invention relates to the field of orthopedic implant technology, specifically to a 3D-printed interbody fusion device. Background Technology

[0002] Lumbar interbody fusion is an effective treatment for lumbar degeneration and instability. It fuses the upper and lower vertebrae, maintains intervertebral disc height, reduces nerve root pressure, and maintains spinal stability. It has good clinical outcomes, minimal surgical trauma, and is easy to perform. In clinical application, the surgical instrument used for this procedure is a retractable interbody fusion device.

[0003] Existing expandable fusion devices suffer from two main limitations: First, products like the TLX20° can only expand the angle obliquely on one side, failing to independently control the angle difference between the anterior and posterior ends of the device. This results in insufficient accuracy in sagittal balance restoration, making it difficult to adapt to individualized anatomical needs, especially in complex lumbar degeneration cases. Second, while devices like the RISE-L fusion device offer continuous adjustment of expansion height, angle adjustment relies on a fixed lordosis design, making it impossible to simultaneously adjust the anterior and posterior angles during expansion. This can lead to uneven stress distribution in the endplate, increasing the risk of implant subsidence. Furthermore, traditional fusion devices often employ smooth or microporous structures on their upper and lower surfaces, resulting in low bone ingrowth efficiency and long fusion cycles.

[0004] For example, Chinese patent document CN217286194U discloses an expandable interbody fusion device, which belongs to the field of orthopedic implant technology. The expandable interbody fusion device includes a main frame of the fusion device, and an expansion body is provided above and / or below the main frame of the fusion device. Two sets of expansion structures are arranged side by side in the main frame of the fusion device. One set of the two sets of expansion structures is driven to the left side of the expansion body, and the other set is driven to the right side of the expansion body, so as to adjust the expansion height of the left or right side of the expansion body through the two sets of expansion structures respectively. At least one set of expansion structures includes a drive shaft and a push block sleeved on the drive shaft and driven by the drive shaft to move along the length direction of the main frame of the fusion device. A connecting rod is provided between the push block and the expansion body, and the two ends of the connecting rod are respectively hinged to the push block and the expansion body.

[0005] However, the interbody fusion device in the above patent documents has a set of opening structures on each side. The drive shaft drives the push block to move along the length of the fusion device, and the connecting rod connected to the push block opens the opening body at each end. The opening height of the opening body is determined by the connecting rod hinged to the opening body. The opening on both sides needs to be adjusted separately, and the opening angle cannot be adjusted synchronously. This unilateral adjustment method is prone to uneven stress distribution in the endplate during interbody surgery, increasing the risk of implant subsidence. Summary of the Invention

[0006] The purpose of this invention is to provide a 3D-printed interbody fusion device that partially solves or alleviates the above-mentioned shortcomings in the prior art. It can achieve simultaneous opening of both ends of the interbody fusion device, thereby avoiding stress concentration on the rear opening side when the front and rear ends of both sides are opened in stages, which increases the difficulty of opening the rear opening side, or even causes excessive stress concentration on one side, thus increasing the risk of implant sinking.

[0007] To solve the aforementioned technical problems, the present invention specifically adopts the following technical solution:

[0008] A 3D-printed intervertebral fusion device includes: a hinged upper support body and a lower support body, and a pushing mechanism disposed between the upper support body and the lower support body, the pushing mechanism comprising:

[0009] A linkage member is disposed between the upper and lower supporting bodies and movable relative to the lower supporting body along the height direction of the intervertebral fusion device. A first push rod is disposed along the axial direction of the intervertebral fusion device. The linkage member has first limiting grooves symmetrically arranged on its two side walls near the rear end of the intervertebral fusion device, and fourth rotating shafts symmetrically arranged on its side wall near the front end of the intervertebral fusion device. The first push rod is mounted on the linkage member in a manner that allows it to move relative to the linkage member along the axial direction of the linkage member. A rear supporting module is connected to the first end of the first push rod near the rear end of the intervertebral fusion device, and a second push rod that can move along the axial direction of the first push rod is sleeved on the second end of the first push rod near the front end of the intervertebral fusion device. A front supporting module is connected to the second end of the second push rod near the front end of the intervertebral fusion device.

[0010] The rear support module includes: a first rotating shaft connected to the first end of the first push rod, the axis of the first rotating shaft being perpendicular to the axis of the first push rod, and the two ends of the first rotating shaft being respectively located in the first limiting slide groove. At least one first rotating member and at least one second rotating member are rotatably connected to the first rotating shaft along the axis. One end of the first rotating member is rotatably connected to the upper support body through the second rotating shaft, and one end of the second rotating member is rotatably connected to the lower support body through the third rotating shaft.

[0011] The front-end expansion module includes: a front-end moving member connected to the second push rod and one end sleeved on the linkage member; a sliding member is provided on the side of the front-end moving member near the rear end of the intervertebral fusion device; correspondingly, the lower expansion body is provided with a second limiting groove for providing a movement path for the sliding member, and a third limiting groove for providing a movement path for the fourth rotating shaft; the extension direction of the second limiting groove forms an acute angle with the axial direction of the lower expansion body; the extension direction of the second limiting groove is perpendicular to the axial direction of the lower expansion body.

[0012] When the first push rod is driven to move axially toward the rear end of the intervertebral fusion device by an external force, and the second push rod is driven to move axially toward the rear end of the intervertebral fusion device by the first push rod, the first push rod pushes the first rotating shaft to move axially along the intervertebral fusion device from the first extreme position of the first limiting groove toward the second extreme position. Simultaneously, the second push rod drives the sliding member on the front end moving member to move axially along the second limiting groove from the third extreme position to the fourth extreme position. At the same time, the front end moving member drives the linkage member to move axially along the height direction from the fifth extreme position of the third limiting groove to the seventh extreme position. When the front and rear ends of the intervertebral fusion device are opened together at the third angle α', the first push rod pushes the first rotating shaft to move axially along the first limiting groove from the first extreme position of the first limiting groove toward the second extreme position.

[0013] Furthermore, both the bone contact surfaces of the upper and lower supporting bodies are provided with a porous structure in the form of diamond.

[0014] Furthermore, when an external force drives the first push rod to move along its axial direction toward the rear end of the intervertebral fusion device, the first push rod pushes the first rotating shaft to move along the axial direction of the intervertebral fusion device from the first limit position of the first limiting groove toward the second limit position, thereby causing the first rotating member and the second rotating member to push the rear end of the upper opening body and the rear end of the lower opening body to move in opposite directions, and when the first rotating shaft moves to the second limit position, the rear end of the intervertebral fusion device opens at a first angle α;

[0015] Alternatively, when an external force drives the second push rod to move along the axis of the first push rod towards the linkage, the second push rod drives the front moving member to move, causing the sliding member to move from the third extreme position to the fourth extreme position along the axis of the second limiting groove. At the same time, the front moving member drives the linkage to move, causing the fourth rotating shaft to move from the fifth extreme position to the sixth extreme position along the height direction. When the sliding member moves to the fourth extreme position and the fourth rotating shaft moves to the sixth extreme position, the front moving member opens the front end of the intervertebral fusion device by a second angle β.

[0016] Furthermore, the second end of the first push rod near the front end of the interbody fusion device is provided with an internal hexagonal tool that mates with surgical instruments.

[0017] Furthermore, the first limiting groove extends along the axial direction of the intervertebral fusion device; the third limiting groove is located between the first limiting groove and the second limiting groove.

[0018] Furthermore, the third extreme position and the fifth extreme position are located on the same horizontal line; and the fourth extreme position and the seventh extreme position are located on the same horizontal line.

[0019] Furthermore, the lower support body is provided with a second lug, and the second rotating member is rotatably connected to the second lug via the third rotating shaft; the upper support body is provided with a first lug, and the first rotating member is rotatably connected to the first lug via the second rotating shaft.

[0020] Furthermore, the linkage includes: a first body, a second body connected to the first body, and the first body being rotatably connected to the lower support body via the fourth rotating shaft.

[0021] Furthermore, at least one anti-backward elastic protrusion is provided on the second push rod near the end of the linkage component; a slot that can cooperate with the anti-backward elastic protrusion is provided in the front moving component.

[0022] Furthermore, the first push rod includes a screw extending axially along the intervertebral fusion device. A first end of the screw near the front end of the intervertebral fusion device is provided with a mating groove, and an internal hexagonal socket is provided in the mating groove. A connector is fastened to the second end of the screw near the rear end of the intervertebral fusion device, and the connector is rotatably connected to the mounting base of the first rotating shaft.

[0023] Beneficial effects:

[0024] In existing technologies, traditional fusion devices, due to their limited adjustment dimensions (only able to adjust the opening height or the angle of one end), struggle to achieve precise biomechanical reconstruction in complex cases such as degenerative scoliosis combined with sagittal imbalance. Consequently, the incidence of postoperative complications such as adjacent segment degeneration and implant displacement is relatively high.

[0025] This invention is based on the coordinated adjustment of the angle and height of the interbody fusion device (see...). Figures 9a-9eThe dynamic adjustment process of the interbody fusion device (the process of adjusting the two ends of the interbody fusion device) is used to achieve synchronous adjustment of the two ends of the interbody fusion device. This invention employs a front-end expansion module and a rear-end expansion module. The rear-end expansion module is rotatably connected to the upper and lower expansion bodies via multiple rotating components. A first limiting groove on the linkage restricts the travel of the first rotating shaft connected to the rotating components, thereby limiting the rear-end expansion angle. The front-end expansion module, on the other hand, uses a second limiting groove on the lower expansion body to limit the travel of the sliding component on the front-end moving component in both axial and height directions. This allows for simultaneous adjustment of angle and height during front-end expansion. Furthermore, when the first and second push rods are driven simultaneously, the sliding component and the second limiting groove, the rotating component and the rotating shaft, the first limiting groove, and the fourth rotating shaft and the third limiting groove work together to achieve synchronous expansion of both ends of the expansion body. During this process, the synchronous expansion of both ends is achieved through the linkage of the front-end moving component and the linkage. For example, when the front-end moving component moves obliquely upward via the sliding component in the second limiting groove, the front-end moving component drives the linkage to move upward as a whole, thereby adjusting the height of the intervertebral fusion device. The interbody fusion device of the present invention can not only meet the opening height requirements, but also adjust the angles of the front and rear ends separately. Moreover, the design does not cause interference when adjusting the height and the angles at both ends, and can be freely adjusted.

[0026] The intervertebral fusion device of the present invention is equipped with a first and a second push rod that can move relative to each other. When it is necessary to open one side, the corresponding push rod can be driven. When it is necessary to open both ends simultaneously, the corresponding external force can be applied to the two push rods at the same time. Compared with the prior art, which requires opening one end first and then opening the other end, the stress concentration problem caused by only opening the front end or the rear end sequentially is greatly reduced.

[0027] This invention relates to a surgical tool for opening an interbody fusion cage. It comprises three nested housings, a first drive rod, and a second drive rod, which engage with the front end of the interbody fusion cage to drive a first and a second push rod. The first drive wheel of each housing rotates to drive the first drive rod, and the second drive wheel rotates to drive the second drive rod. A locking mechanism between the locking member and the first and second drive rods allows only the first drive rod to rotate, only the second drive rod to rotate, or the housing, the first drive rod, and the second drive rod to rotate simultaneously. Simultaneous rotation of the housing, the first drive rod, and the second drive rod opens both ends of the interbody fusion cage at the same time. This surgical tool can assist in opening interbody fusion cages during lumbar spine surgery. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale. Obviously, the drawings described below are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0029] Figure 1 This is a schematic diagram of the interbody fusion device structure of this application;

[0030] Figure 2 This is a schematic diagram of the interbody fusion device from another angle.

[0031] Figure 3 This is a schematic diagram of the internal structure of the interbody fusion device of this application;

[0032] Figure 4 This is a side view of the interbody fusion device of this application;

[0033] Figure 5 This is a cross-sectional view of the interbody fusion device of this application;

[0034] Figure 6 This is an exploded view of the interbody fusion device of this application;

[0035] Figure 7 This is a schematic diagram of the structure of the first push rod of this application;

[0036] Figure 8 This is a cross-sectional view of the interbody fusion device of this application when it is open;

[0037] Figure 9a This is a schematic diagram of the interbody fusion device in state I of this application;

[0038] Figure 9b This is a schematic diagram of the interbody fusion device in state II of this application;

[0039] Figure 9c This is a schematic diagram of the interbody fusion device in state III of this application;

[0040] Figure 9d This is a schematic diagram of the interbody fusion device in state IV of this application;

[0041] Figure 9e This is a schematic diagram of the interbody fusion device in state V according to this application;

[0042] Figure 10 This is a schematic diagram of the structure of the surgical tool of this application;

[0043] Figure 11 This is a schematic diagram of the connection between the surgical tool and the interbody fusion device of this application;

[0044] Figure 12 This is a schematic diagram showing the positions of the first and second locking components in the surgical tool of this application;

[0045] Figure 13a This is a cross-sectional view of the surgical tool of this application;

[0046] Figure 13b This is a cross-sectional view of the connection between the second driven member and the second drive wheel of the surgical tool of this application;

[0047] Figure 13c This is a cross-sectional view of the connection between the first driven member and the first drive wheel of the surgical tool of this application.

[0048] Figure 14 This is a schematic diagram of the outer shell structure of the surgical tool of this application;

[0049] Figure 15 This is a schematic diagram of the connection between the surgical tool and the interbody fusion device in this application;

[0050] Figure 16 This is a schematic diagram of the structure of the first and second drive rods of the surgical tool of this application;

[0051] Figure 17 This is a cross-sectional view of the surgical tool and interbody fusion device of this application when connected;

[0052] Figure 18 This is a schematic diagram of the tilt angle of the third limiting groove in this application.

[0053] Summary of attached labeling and identification:

[0054] 100. Upper support body; 200. Lower support body; 300. Linkage component; 400. First push rod; 500. Second push rod; 600. First rotating shaft; 700. Second rotating shaft; 800. Front moving component; 900. Third rotating shaft;

[0055] A. First extreme position; B. Second extreme position; C. Third extreme position; D. Fourth extreme position; E. Fifth extreme position; F. Sixth extreme position; G. Seventh extreme position;

[0056] 201. Second limiting slide groove; 202. Third limiting slide groove; 203. Fourth rotating shaft;

[0057] 301. First limiting slide groove; 302. First body; 303. Second body;

[0058] 601. First rotating component; 602. Second rotating component; 603. First lug; 604. Second lug;

[0059] 801. Sliding component; 802. Anti-backward elastic protrusion;

[0060] 901. Housing; 902. Second drive rod; 903. First drive rod; 904. First driven member; 905. First drive wheel; 906. Second driven member; 907. Second drive wheel; 908. First locking member; 909. Second locking member; 910. Viewing window. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0062] In this document, suffixes such as "module," "part," or "unit" used to denote elements are used only for the purpose of illustrative purposes and have no specific meaning in themselves. Therefore, "module," "part," or "unit" may be used interchangeably.

[0063] In this document, the terms "upper," "lower," "inner," "outer," "front," "rear," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and 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. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0064] In this document, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0065] In this document, "and / or" includes any and all combinations of one or more of the listed related items.

[0066] In this article, "multiple" means two or more, that is, it includes two, three, four, five, etc.

[0067] Example 1: As Figure 1 As shown, this embodiment proposes a 3D-printed intervertebral fusion device, including: a hinged upper support body 100 and a lower support body 200, and a pushing mechanism disposed between the upper support body 100 and the lower support body 200, the pushing mechanism including:

[0068] A linkage 300, disposed between the upper support body 100 and the lower support body 200 and movable relative to the lower support body 200 along the height direction, and a first push rod 400 axially disposed along the intervertebral fusion device, the first push rod 400 being mounted on the linkage 300 in a manner movable relative to the linkage 300 along the linkage 300 axially. A rear-end support module is connected to a first end of the first push rod 400 near the rear end of the intervertebral fusion device, and a second push rod 500, movable along the first push rod 400 axially, is sleeved on a second end of the first push rod 400 near the front end of the intervertebral fusion device. A front-end support module is connected to one end of the second push rod 500 near the front end of the intervertebral fusion device. (See also...) Figure 1 and Figure 3 .

[0069] Specifically, the first end of the first push rod 400 (which is at the same position as the first end of the second push rod 500, i.e., in the same direction) and the second end of the first push rod 400 are assembly parts, respectively connected to the rear end opening module and the front end opening module, and the middle part of both ends is threaded. Preferably, the first push rod 400 is a lead screw.

[0070] In some embodiments, the rear-end expansion module includes: a first rotating shaft 600 connected to a first end of the first push rod 400, the axial direction of the first rotating shaft 600 being perpendicular to the axial direction of the first push rod 400, and both ends of the first rotating shaft 600 being located in first limiting grooves 301 symmetrically arranged on the two side walls of the linkage member 300, respectively; at least one first rotating member 601 and at least one second rotating member 602 being rotatably connected to the first rotating shaft 600 along its axial direction; the other end of the first rotating member 601 being rotatably connected to the upper expansion body 100 via a second rotating shaft 700; and the other end of the second rotating member 602 being rotatably connected to the lower expansion body 200 via a third rotating shaft 900, that is, the axial directions of the first rotating member 601 and the second rotating member 602 are intersecting, for example, the axial direction of the first rotating member 601 is inclined upwards, while the axial direction of the second rotating member 602 is inclined downwards, see [reference]. Figure 3 .

[0071] Specifically, the upper supporting body 100 is provided with a first lug 603, and one end of the first rotating member 601 is rotatably connected to the first lug 603. The lower supporting body 200 is provided with a second lug 604, and one end of the second rotating member 602 is rotatably connected to the second lug 604. See [reference needed] Figure 6 .

[0072] In some embodiments, the second rotating member 602 may be one at each end of the first rotating shaft 600, with one end of each second rotating member 602 rotatably connected to the two ends of the first rotating shaft 600, and the other end of each second rotating member 602 rotatably connected to two second lugs 604 on the lower support body 200.

[0073] In some embodiments, the front-end expansion module includes: a front-end moving member 800 connected to the second push rod 500, wherein a sliding member 801 is provided on the side wall of the front-end moving member 800 near the rear end of the intervertebral fusion device; correspondingly, the lower expansion body 200 is provided with a second limiting groove 201 providing a movement path for the sliding member 801, and a third limiting groove 202 providing a movement path for the linkage member 300 (rotatably connected fourth rotating shaft 203); the extending direction of the second limiting groove 201 forms an acute angle with the axial direction of the lower expansion body 200 (e.g., ...). Figure 18 The angle shown is 30°-45°, preferably 35°); the extension direction of the third limiting groove 202 is parallel to the height direction of the intervertebral fusion device, that is, when the front end and the rear end of the intervertebral fusion device are in an unopened state, the extension direction of the third limiting groove 202 is perpendicular to the axis of the intervertebral fusion device.

[0074] When an external force drives the first push rod 400 to move axially toward the rear end of the intervertebral fusion device, and simultaneously drives the second push rod 500 to move axially toward the rear end of the intervertebral fusion device, the first push rod 400 pushes the first rotating shaft 600 to move axially along the intervertebral fusion device from the first extreme position A of the first limiting groove 301 toward the second extreme position B. Simultaneously, the second push rod 500 drives the sliding member 801 on the front moving member 800 to move along the second limiting groove 20. The axis of the first rotating shaft 600 moves from the third extreme position C to the fourth extreme position D. Simultaneously, the front moving part 800 drives the fourth rotating shaft 203 on the linkage 300 to move along the height direction from the fifth extreme position E to the seventh extreme position G of the third limiting groove 202. When the first rotating shaft 600 moves to the second extreme position B, the sliding part 801 moves to the fourth extreme position D, and the fourth rotating shaft 203 moves to the seventh extreme position G, the rear and front ends of the intervertebral fusion device simultaneously open to a third angle α' (the third angle is 8°-12°, preferably 10°). Figure 9eThe state V shown is shown in the figure.

[0075] Alternatively, when an external force drives the first push rod 400 to move axially toward the rear end of the intervertebral fusion device, and simultaneously drives the second push rod 500 to move axially toward the rear end of the intervertebral fusion device, the first push rod 400 pushes the first rotating shaft 600 to move axially along the intervertebral fusion device from the first extreme position A of the first limiting groove 301 toward the second extreme position B. Simultaneously, the second push rod 500 drives the sliding member 801 on the front moving member 800 to move along the second limiting groove 20. The axis of 1 moves from the third extreme position C to the fourth extreme position D. Simultaneously, the front moving part 800 drives the fourth rotating shaft 203 on the linkage 300 to move along the height direction from the fifth extreme position E to the seventh extreme position G of the third limiting slide groove 202. When the first rotating shaft 600 moves to the eighth extreme position P, the sliding part 801 moves to the fourth extreme position D, and the fourth rotating shaft 203 moves to the seventh extreme position G, the rear and front ends of the intervertebral fusion device are simultaneously and parallelly opened. At this time, the maximum height H+h is reached between the upper opening body 100 and the lower opening body 200. Figure 9d State IV is shown;

[0076] Alternatively, when an external force drives the first push rod 400 to move axially toward the rear end of the intervertebral fusion device, the first push rod 400 pushes the first rotating shaft 600 to move axially along the intervertebral fusion device from the first extreme position A of the first limiting groove 301 toward the second extreme position B. This causes the first rotating member 601 to rotate toward the upper supporting body 100, while the second rotating member 602 rotates toward the lower supporting body 200. When the first rotating shaft 600 moves to the second extreme position B, the rear end of the intervertebral fusion device expands by a first angle α. Figure 9b Medium state II;

[0077] Alternatively, when an external force drives the second push rod 500 to move axially toward the rear end of the intervertebral fusion device along the first push rod 400, the second push rod 500 drives the sliding member 801 on the front moving member 800 to move axially from the third extreme position C to the fourth extreme position D along the second limiting groove 201. Simultaneously, the front moving member 800 drives the fourth rotating shaft 203 on the linkage member 300 to move axially from the fifth extreme position E of the third limiting groove 202 toward the sixth extreme position F. When the sliding member 801 moves to the fourth extreme position D and the fourth rotating shaft 203 moves to the fifth extreme position E, the front moving member 800 opens the front end of the intervertebral fusion device by a second angle β. Figure 9cState III is shown in the diagram.

[0078] The maximum opening angle α of the separately opened rear end in this application is 15°-25°, see [link / reference]. Figure 9b Preferably 18°; the maximum opening angle β of the front end alone is 5°-15°, see [reference]. Figure 9c The preferred angle is 11°; the angle α' when the front and rear ends are simultaneously opened is 8°-12°, see [reference]. Figure 9e Preferably, it is 10°.

[0079] In this embodiment, the interbody fusion cage is in the unopened state (see...). Figure 9a In state I), the initial height between the upper expansion body 100 and the lower expansion body 200 is H (the initial height is determined by the structure itself). Simultaneously, the first and second push rods 400 and 500 of the interbody fusion device are driven, causing the front and rear ends of the interbody fusion device to open parallel to each other. When the maximum height between the upper expansion body 100 and the lower expansion body 200 is reached (i.e., when the fourth rotating shaft 203 moves to the seventh extreme position G), which is H+h, the interbody fusion device changes to state IV. Here, h is 2-5 mm, preferably 3 mm. This height is the maximum height of this interbody fusion device, and this height is the same as the height of the upper expansion body 100 and the lower expansion body 200 at the front end when the maximum angle β of the front end is opened alone. Figure 9c The height shown is H+h.

[0080] The interbody fusion device in this embodiment can be adjusted from any of the three states: separately opening the front end (state III), separately opening the rear end (state II), or parallel opening of the upper and lower supports (state IV) to state V, or from state V to any other state. The interbody fusion device of this invention not only meets the opening height requirement but also allows for simultaneous adjustment of the angles of the front and rear ends. Furthermore, this design ensures that adjusting the height and the angles at both ends does not cause interference and allows for free adjustment.

[0081] In some embodiments, the linkage 300 of the intervertebral fusion device includes: a first body 302 and a second body 303 connected to the first body 302. The first body 302 is connected to the front moving member 800. The side of the first body 302 is rotatably connected to the third limiting slide groove 202 through the fourth rotating shaft 203. The second body 303 forms a space to accommodate the rear supporting module. The side of the second body 303 is provided with the first limiting slide groove 301.

[0082] Preferably, see Figure 6The first body 302 is a rectangular frame. The second body 303 includes a second frame providing a sliding track for the first push rod 400, and a third frame connected to the second frame. The second frame has a through hole along the axial direction of the intervertebral fusion device, and the top and bottom plates of the first frame are fixedly connected to the second frame. The third frame has symmetrically arranged first limiting grooves 301 (as described above) on its two side walls. Figure 5 (As shown).

[0083] See Figure 7 and Figure 8 Preferably, a pin is fastened to the second end of the first push rod 400 near the rear end of the intervertebral fusion device, and the end of the pin near the rear end of the intervertebral fusion device is rotatably connected to the mounting base of the first rotating shaft 600. Specifically, the mounting base has a groove for mounting the pin, so that when the first push rod 400 is driven to rotate relative to the second push rod 500 using a tool, the first push rod 400 drives the pin to rotate in the groove, and the pin pushes the mounting base and the first rotating shaft 600 to move.

[0084] In this application, the opening angle and height of the intervertebral fusion device can be clearly quantified by adjusting the length of the first rotating member 601 and the second rotating member 602, as well as the grooves that work together with them (such as the first limiting groove 301, the second limiting groove 201 and the third limiting groove 202), and prevent damage to other components during the opening process. The length of the groove can be slightly adjusted to avoid the opening height and angle being too large.

[0085] In some embodiments, the bone contact surfaces of the upper support body 100 and the lower support body 200 are both provided with a porous structure in the form of diamond. (See also...) Figure 2 .

[0086] In some embodiments, the second end of the first push rod 400 near the front end of the interbody fusion device is provided with an internal hexagonal tool that cooperates with surgical instruments.

[0087] In some embodiments, the first limiting groove 301 extends along the axial direction of the intervertebral fusion device; the third limiting groove 202 extends along the height direction of the intervertebral fusion device, and the third limiting groove 202 is located between the first limiting groove 301 and the second limiting groove 201.

[0088] In some embodiments, the third extreme position C and the fifth extreme position E are located on the same horizontal line; and the fourth extreme position D and the seventh extreme position G are located on the same horizontal line.

[0089] In this application, the upper and lower support bodies adopt a porous structure of 3D-printed diamond, which can better promote bone ingrowth and improve the long-term stability of the fusion device.

[0090] In some embodiments, the second push rod 500 is provided with anti-backward elastic protrusions 802 at circumferential intervals, which cooperate with the grooves on the front end moving member 800.

[0091] See Figure 3 , Figure 4 and Figure 6 When the second push rod 500 moves on the first push rod 400, guided by the inclined surface of the anti-backward elastic protrusion 802, the anti-backward elastic protrusion 802 gradually disengages from the groove, causing the second push rod 500 to gradually approach the linkage 300. Preferably, when the second push rod 500 abuts against the linkage 300, the sliding member 801 moves to the fourth limit position D.

[0092] Example 2: This example provides a surgical tool for opening the interbody fusion cage. The surgical tool is used to open the interbody fusion cage, and the two are used together in clinical practice.

[0093] The second end of the first push rod 400 in the interbody fusion device is provided with a mating groove (e.g., a recessed groove of an internal hexagon); the first end of the second push rod 500 in the interbody fusion device is provided with a mating part (e.g., an external hexagonal nut); the surgical tool includes:

[0094] The system comprises a housing 901, a second drive rod 902 sleeved within the housing 901 for driving the second push rod 500 to rotate, and a first drive rod 903 coaxially sleeved within the second drive rod 902 for driving the first push rod 400 to rotate; the first drive rod 903 is axially slidable relative to the second drive rod 902, and the second drive rod 902 is axially slidable relative to the housing 901. (See also...) Figure 13a and Figure 17 .

[0095] The first drive rod 903 has a fastening component at its mating end that engages with the first push rod 400, and a first driven member 904 is provided at the other end of the first drive rod 903 away from the mating end. The housing 901 has a first drive wheel 905 that engages with the first driven member 904. (See also...) Figure 13c , Figure 16 and Figure 17 .

[0096] The operating end of the second drive rod 902 is provided with a second driven member 906, and the housing 901 is provided with a second drive wheel 907 that cooperates with the second driven member 906. (See also...) Figure 13a and Figure 13b .

[0097] The housing 901 is also provided with a first locking member 908 for locking the first drive rod 903, and a second locking member 909 for locking the second drive rod 902. See [link / reference] Figure 12 and Figure 16 .

[0098] When the first locking member 908 is in the unlocked state and the second locking member 909 is in the locked state, driving the first drive wheel 905 to rotate causes the first driven member 904 to rotate, the first driven member 904 causes the first drive rod 903 to rotate, and the first drive rod 903 causes the first push rod 400 to rotate. (See below) Figure 11 , Figure 13a and Figure 17 .

[0099] Alternatively, when the first locking member 908 is in the locked state and the second locking member 909 is in the unlocked state, when the second drive wheel 907 is driven to rotate, the second drive wheel 907 drives the second driven member 906 to rotate, the second driven member 906 drives the second drive rod 902 to rotate, and the second drive rod 902 drives the second push rod 500 to rotate.

[0100] Alternatively, when both the first locking member 908 and the second locking member 909 are in the locked state, when the housing 901 is rotated, the housing 901 synchronously drives the first driving rod 903 and the second driving rod 902 to rotate, so that while the first driving rod 903 drives the first push rod 400 to rotate, the second driving rod 902 drives the second push rod 500 to rotate.

[0101] In some embodiments, the first drive wheel 905 is threadedly engaged with the first driven member 904; the second drive wheel 907 is threadedly engaged with the second driven member 906.

[0102] Specifically, the outer casing 901 is cylindrical.

[0103] In some embodiments, a rotating handle is provided at the end of the housing 901 away from the intervertebral fusion device. When the first drive rod 903 and the second drive rod 902 are locked, rotation is achieved by rotating the rotating handle on the housing 901. (See also...) Figure 15 and Figure 16 .

[0104] In some embodiments, the fastening component that engages with the mating groove at one end of the first drive rod 903 is a hexagonal prism. In particular, the fastening component can be of other shapes. This structure can engage with the mating groove to cause the first drive rod 903 to drive the first push rod 400 to rotate. Similarly, the structural principle of the mating part of the second drive rod 902 engaging with the second push rod 500 is the same.

[0105] In some embodiments, the first drive rod 903 and the first follower 904, as well as the second drive rod 902 and the second follower 906, may be an integrated structure.

[0106] In some embodiments, the first locking member 908 and the second locking member 909 are screws. The housing 901 has openings corresponding to the positions of the first drive rod 903 and the second drive rod 902. The first locking member 908 and the second locking member 909 can lock the first drive rod 903 and the second drive rod 902. Specifically, grooves can be formed on the first drive rod 903 or the second drive rod 902, allowing the first locking member 908 and the second locking member 909 to abut into the grooves, thereby preventing slight rotation of the two drive rods and improving the locking effect. The screws also prevent the two drive rods from retracting after the opening is complete, increasing stability.

[0107] In some embodiments, a viewing window 910 is further provided on the housing 901, and scales are provided on the first drive rod 903 and the second drive rod 902. The scales on the drive rods can be visualized through the viewing window 910, thereby allowing the calculation of the opening angle of the interbody fusion device. (See [reference needed]) Figure 10 , Figure 13a and Figure 14 .

[0108] Example 3: This example provides a surgical tool assembly, including the interbody fusion device as described in Example 1 and the surgical tool for opening the interbody fusion device as described in Example 2. The surgical tool cooperates with the interbody fusion device to open both ends of the device. The specific working principle can be found in Example 2 above, and will not be repeated here.

[0109] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0110] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A 3D printed intervertebral fusion cage, characterized in that, The utility model relates to an intervertebral fusion cage, comprising: a hinged upper distraction body (100) and a lower distraction body (200), a pushing mechanism arranged between the upper distraction body (100) and the lower distraction body (200), the pushing mechanism comprising: a linkage (300) arranged between the upper distraction body (100) and the lower distraction body (200) and movable relative to the lower distraction body (200) in the height direction of the intervertebral fusion cage, a first advancing rod (400) arranged in the axial direction of the intervertebral fusion cage, wherein the linkage (300) is symmetrically provided with first limiting sliding grooves (301) on the two side walls near the rear end of the intervertebral fusion cage, and symmetrically provided with fourth rotating shafts (203) on the side walls near the front end of the intervertebral fusion cage; the first advancing rod (400) is installed on the linkage (300) in a manner that it is movable relative to the linkage (300) in the axial direction of the linkage (300); and the first advancing rod (400) is connected at a first end near the rear end of the intervertebral fusion cage with a rear end distraction module, and the second end of the first advancing rod (400) near the front end of the intervertebral fusion cage is sleeved with a second advancing rod (500) movable in the axial direction of the first advancing rod (400); the second advancing rod (500) is connected at an end near the front end of the intervertebral fusion cage with a front end distraction module; the rear end distraction module comprises: a first rotating shaft (600) connected with the first end of the first advancing rod (400), the axial direction of the first rotating shaft (600) being perpendicular to the axial direction of the first advancing rod (400), and the two ends of the first rotating shaft (600) being located in the first limiting sliding grooves (301) respectively, at least one first rotating member (601) and at least one second rotating member (602) being rotationally connected on the first rotating shaft (600) in the axial direction, one end of the first rotating member (601) being rotationally connected with the upper distraction body (100) through a second rotating shaft (700), and one end of the second rotating member (602) being rotationally connected with the lower distraction body (200) through a third rotating shaft (900); the front end distraction module comprises: a front end moving member (800) connected with the second advancing rod (500) and sleeved at one end on the linkage (300), the front end moving member (800) being provided on one side near the rear end of the intervertebral fusion cage with a sliding member (801); correspondingly, the lower distraction body (200) is provided with a second limiting sliding groove (201) providing a movement path for the sliding member (801), and a third limiting sliding groove (202) providing a movement path for the fourth rotating shaft (203); the extension direction of the second limiting sliding groove (201) forms an acute angle with the axial direction of the lower distraction body (200); and the extension direction of the second limiting sliding groove (201) is perpendicular to the axial direction of the lower distraction body (200). When the first pushing rod (400) is driven to move along its axial direction towards the direction of the posterior end of the intervertebral cage by an external force, and the second pushing rod (500) is driven to move along the axial direction of the first pushing rod (400) towards the direction of the posterior end of the intervertebral cage, the first pushing rod (400) drives the first rotating shaft (600) to move along the axial direction of the intervertebral cage from the first limit position (A) of the first limit sliding groove (301) towards the direction of the second limit position (B), and simultaneously, the second pushing rod (500) drives the sliding member (801) on the front end moving member (800) to move along the axial direction of the second limit sliding groove (201) from the third limit position (C) towards the fourth limit position (D), and the front end moving member (800) drives the linkage member (300) to move along the height direction from the fifth limit position (E) of the third limit sliding groove (202) to the seventh limit position (G), and when the intervertebral cage front end and the posterior end jointly distract the third angle α'.

2. The 3D-printed intervertebral fusion cage of claim 1, wherein, The bone contact surface of the upper distraction body (100) and the bone contact surface of the lower distraction body (200) are provided with a diamond structure porous structure.

3. The 3D printed intervertebral fusion cage of claim 1, wherein, When the first pushing rod (400) is driven to move along its axial direction towards the direction of the posterior end of the intervertebral cage by an external force, the first pushing rod (400) drives the first rotating shaft (600) to move along the axial direction of the intervertebral cage from the first limit position (A) of the first limit sliding groove (301) towards the direction of the second limit position (B), so that the first rotating member (601) and the second rotating member (602) respectively drive the posterior end of the upper distraction body (100) and the posterior end of the lower distraction body (200) to move away from each other, and when the first rotating shaft (600) moves to the second limit position (B), the posterior end of the intervertebral cage is distracted by the first angle α. Alternatively, when the second pushing rod (500) is driven to move along the axial direction of the first pushing rod (400) towards the direction of the linkage member (300) by an external force, the second pushing rod (500) drives the front end moving member (800) to move, so that the sliding member (801) moves along the axial direction of the second limit sliding groove (201) from the third limit position (C) to the fourth limit position (D), and the front end moving member (800) drives the linkage member (300) to move, so that the fourth rotating shaft (203) moves along the height direction from the fifth limit position (E) of the third limit sliding groove (202) to the sixth limit position (F), and when the sliding member (801) moves to the fourth limit position (D) and the fourth rotating shaft (203) moves to the sixth limit position (F), the front end moving member (800) distracts the front end of the intervertebral cage by the second angle β.

4. The 3D-printed intervertebral fusion cage of claim 1, wherein, The second end of the first pushing rod (400) close to the front end of the intervertebral cage is provided with an internal hexagon matched with a surgical tool.

5. The 3D printed intervertebral fusion cage of claim 1, wherein, The first limiting sliding groove (301) extends along the axial direction of the intervertebral fusion cage; the third limiting sliding groove (202) is located between the first limiting sliding groove (301) and the second limiting sliding groove (201).

6. The 3D-printed intervertebral fusion cage of claim 1, wherein, The third limit position (C) is located on the same horizontal line as the fifth limit position (E); and the fourth limit position (D) is located on the same horizontal line as the seventh limit position (G).

7. The 3D-printed intervertebral fusion cage of claim 1, wherein, The lower distraction body (200) is provided with a second supporting lug (604), and the second rotating member (602) is rotationally connected with the second supporting lug (604) through the third rotating shaft (900); the upper distraction body (100) is provided with a first supporting lug (603), and the first rotating member (601) is rotationally connected with the first supporting lug (603) through the second rotating shaft (700).

8. The 3D-printed intervertebral fusion cage of claim 1, wherein, The linkage member (300) comprises a first body (302) and a second body (303) connected with the first body (302), and the first body (302) is rotationally connected with the lower distraction body (200) through the fourth rotating shaft (203).

9. The 3D-printed intervertebral fusion cage of claim 1, wherein, At least one anti-reverse elastic protrusion (802) is arranged on one end of the second advancing rod (500) close to the linkage member (300); a clamping groove that can cooperate with the anti-reverse elastic protrusion (802) is arranged in the front end moving member (800).

10. The 3D-printed intervertebral fusion cage of claim 1, wherein, The first advancing rod (400) comprises a screw rod extending along the axial direction of the intervertebral fusion cage, a first end of the screw rod close to the front end of the intervertebral fusion cage is provided with a cooperating groove, an internal hexagon is arranged in the cooperating groove, and a connecting member is rotationally connected with the mounting seat of the first rotating shaft (600) at a second end of the screw rod close to the rear end of the intervertebral fusion cage.

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