Intervertebral fusion cage incorporating anchoring elements

Abstract

This invention relates to a prosthesis for implantation between vertebrae. Specifically, it discloses an intervertebral fusion device with built-in anchoring elements, comprising: a fusion device body having two end faces, an anterior wall and a posterior wall, two side walls, and a bone graft window; each side of the bone graft window of the fusion device body has two first linear channels extending from the anterior wall and penetrating to the posterior region of the end face, and two second linear channels extending from the posterior wall and penetrating to the anterior region of the end face; an anchor rod pre-positioned in the linear channels; and an actuation mechanism including an operating head exposed on the anterior wall of the fusion device body and an actuating body located in the fusion device body for driving the anchor rod. By turning the operating head, the actuating body drives the anchor rods in the first and second linear channels to extend obliquely forward from the posterior and anterior regions of the end faces, respectively, under the guidance of their respective linear channels, and insert them into the vertebrae through the endplate.

Description

Technical Field

[0001] This invention relates to a prosthesis for implantation in the intervertebral space of the human cervical spine, and more particularly to an intervertebral fusion device with built-in anchoring elements. Background Technology

[0002] As is well known, a fusion cage, implanted in the intervertebral space between two vertebrae (where the damaged intervertebral disc has been removed before implantation), serves two purposes: maintaining the normal physiological distance between the two vertebrae and promoting the growth of new bone in the vertebral endplates. Ultimately, the newly grown bone allows the two vertebrae to fuse in a normal physiological posture. A typical surgical procedure for implanting the fusion cage into the intervertebral space between two vertebrae is anterior cervical discectomy and fusion, in which the fusion cage is delivered to the intervertebral space between the two vertebrae via the anterior aspect of the cervical spine.

[0003] During fusion surgery, after the fusion cage is delivered to the intervertebral space, the two vertebrae corresponding to the fusion cage need to be fixed. This is because: firstly, a certain contact force needs to be formed between each end face of the fusion cage and the endplate of the corresponding vertebra to promote new bone growth in the endplate; secondly, it prevents postoperative displacement of the fusion cage and misalignment between the two vertebrae (postoperative displacement of the fusion cage may lead to dislodgement from the intervertebral space, poor vertebral fusion, etc., while vertebral misalignment will seriously affect the reconstruction or maintenance of the cervical spine's physiological curve). Currently, there are two typical methods of vertebral fixation: the first method uses bone plates attached to the anterior side of the two vertebrae to simultaneously fix them. The bone plates may or may not be connected to the fusion cage located in the intervertebral space. A typical drawback of this method is that the bone plates are exposed and protrude from the anterior side of the vertebrae, which may affect the function of the anterior cervical tissues and cause pain; for example... Figure 1 As shown, the second fixation method utilizes an inclined extension channel pre-drilled on the fusion device through the anterior wall of the fusion device 200 to allow an anchoring element (such as a bone screw or anchor rod 201) to be inserted into the vertebra 1000 through the end face of the fusion device 200 and the endplate 1001 of the vertebra 1000. This anchors the fusion device 200 to the two vertebrae 1000. Since the fusion device 200 and the anchoring element are surrounded by new bone after the two vertebrae 1000 are fused and are not exposed on the outside of the vertebra 1000, it is possible to avoid affecting the human tissues around the vertebra 1000.

[0004] However, the existing fixation method that uses anchoring elements to anchor the fusion device to the two vertebrae has the following drawbacks:

[0005] Regarding the stability of the anchorage after surgery, such as Figure 1As shown, taking anchor rod 201 for anchoring as an example, in the anterior and posterior directions, since there is only one anchor rod 201 inserted into the vertebra 1000 from the end face of the fusion device 200 at an angle to the rear, there is only one anchor point between each end face of the fusion device 200 and the endplate 1001 of the corresponding vertebra 1000 in the anterior and posterior directions. Therefore, in the early postoperative period when the vertebra 1000 is not fused, the end face of the fusion device 200 and the endplate 1001 of the vertebra 1000 may frequently separate with the patient's flexion and extension movements, thereby affecting the fusion of new bone. The reason why the anchor rod 201 can only be inserted into the vertebra 1000 from the end face of the fusion device 200 at an angle to the rear through the channel from the anterior wall of the fusion device 200 is that the operating instrument can only perform the pushing operation on the anchor rod 201 from the anterior side of the vertebra 1000 and cannot perform the pushing operation on the anchor rod 201 from the posterior side of the vertebra 1000.

[0006] Regarding the ease of operation and the balance of force during the operation, in the existing technology, an external manipulator is usually used to apply a linear thrust directly to the tail of the anchor rod so that the head of the anchor rod passes through the fusion device and is inserted into the vertebra. However, applying a linear thrust directly with an external manipulator is significantly more difficult than applying a torque directly. Furthermore, since there are only anchor rods that are tilted backward into the vertebra and not those that are tilted forward into the vertebra, the fusion device may shift backward with the anchor rod during the insertion process due to the imbalance of force, resulting in positional displacement.

[0007] like Figure 2 As shown, although the prior art has fusion devices 200 with built-in anchor rods 201, after the fusion device 200 is placed in the intervertebral space, the anchor rods 201 can extend from the end face of the fusion device 200 in a basically symmetrical manner in the anterior and posterior directions and be inserted into the vertebra 1000 so that the fusion device 200 and the vertebra 1000 form two anchor points in the anterior and posterior directions, the anchor rods 201 do not extend and insert into the vertebra 1000 in a manner along a constant axis, but rather extend and insert into the vertebra 1000 in a manner involving rotation or translation. As a result, the cross-section of the anchor hole 1002 into which the anchor rods 201 are inserted in the vertebra 1000 is much larger than the cross-section of the anchor rods 201. This not only greatly reduces the anchoring effect, but also significantly increases the area of ​​bone damage caused by the anchor rods 201 to the vertebra. Summary of the Invention

[0008] In view of the above-mentioned technical problems existing in the prior art, the present invention provides an interbody fusion device with built-in anchoring elements.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0010] An interbody fusion device with built-in anchoring elements includes:

[0011] The fusion device body has two end faces facing the endplates of the two vertebrae respectively, an anterior and posterior walls in the anterior-posterior direction between the two end faces, two lateral walls in the lateral direction, and a bone graft window penetrating the two end faces; each side of the fusion device body in the lateral direction of the bone graft window is provided with a linear channel, the linear channel including two first linear channels extending backward from the anterior wall and obliquely penetrating the posterior region of the two end faces respectively, and two second linear channels extending forward from the posterior wall and obliquely penetrating the anterior region of the two end faces respectively.

[0012] An anchor bolt is pre-installed in each of the linear channels;

[0013] The actuation mechanism includes an operating head exposed on the anterior wall of the fusion device body for screwing and an actuation body located in the fusion device body for driving the anchor rods. After the fusion device body is placed in the intervertebral space, the actuation body drives the anchor rods in the first linear channel and the second linear channel to extend obliquely backward from the posterior region of the end face and obliquely forward from the anterior region of the end face, respectively, under the guidance of the linear channel, and insert them into the vertebra through the endplate.

[0014] Preferably,

[0015] The fusion body has a mounting hole extending in the front-to-back direction; the first linear channel and the second linear channel each have an inlet straight segment that corresponds to the front wall and the rear wall respectively to form an entry port, an outlet straight segment that corresponds to the two end faces respectively to form an exit port and is inclined relative to the inlet straight segment, and a transition segment connecting the inlet straight segment and the outlet straight segment; the inlet straight segment is adjacent to the mounting hole and radially penetrates it.

[0016] The actuating body includes: a rotating rod that passes through a mounting hole and is driven to rotate by an operating head; two driving sleeves that are sleeved on the rotating rod and rotate with the rotating rod and are axially spaced apart, with helical tooth grooves on their outer peripheral surfaces; the two driving sleeves are respectively located at axial positions corresponding to the lead-in straight segments of the first linear channel and the second linear channel.

[0017] The anchor rod is a straight rod before being inserted into the linear channel; at least on the outer peripheral surface of the anchor rod adjacent to the mounting hole, a row of side teeth is arranged at intervals along the extension direction of the anchor rod. After the head of the anchor rod is inserted from the inlet port of the linear channel into the lead-in straight section of the linear channel, the side teeth of the anchor rod radially enter the mounting hole and engage with the helical groove of the drive sleeve. Thus, the anchor rod is driven by the drive sleeve by the engagement and moves along the linear channel and extends out from the outlet port after passing through the lead-in straight section, the transition section and the exit straight section in sequence.

[0018] Preferably, a first limiting step facing the head is machined on the anchor bolt, and a second limiting step facing the entry port is machined on the linear channel. The first limiting step abuts against the second limiting step to limit the extension of the anchor bolt and fix the anchor bolt in place; wherein:

[0019] Each drive sleeve is fitted onto the rotating rod in a manner that allows it to move axially relative to the rotating rod while restricting its rotation;

[0020] An elastic component is fitted on both sides of the rotating rod in the axial direction of each drive sleeve. The elastic component is used to apply elastic force to the drive sleeve and allow the drive sleeve to overcome the elastic force and move axially relative to the rotating rod.

[0021] Preferably, each side of the fusion unit body of the bone graft window has two mounting holes arranged vertically; each side of the fusion unit body of the bone graft window is correspondingly equipped with two actuation mechanisms, and the actuation bodies of the two actuation mechanisms are respectively installed in the two mounting holes; wherein:

[0022] Each mounting hole has a first linear channel and a second linear channel arranged on both sides in the left and right directions; the two drive sleeves on the rotating rod of the actuating body respectively engage with the side teeth of the anchor rod in the first linear channel and the second linear channel on the left and right sides of the mounting hole where the actuating body is located, so as to drive the two anchor rods to extend obliquely from the rear and front regions of the end face adjacent to the mounting hole in a synchronized manner. Thus, the four anchor rods are driven by two actuation mechanisms.

[0023] Preferably, a mounting hole is provided in the fusion body on each side of the bone graft window; an actuation mechanism is correspondingly configured on the fusion body on each side of the bone graft window, and the actuation body of the actuation mechanism is installed in the mounting hole.

[0024] Two first linear channels and two second linear channels are arranged on both sides of the mounting hole in the left-right direction, with the two first linear channels on the same side and the two second linear channels on the same side; the two drive sleeves on the rotating rod of the actuating body simultaneously mesh with the side teeth of the two anchor rods in the two first linear channels and the two anchor rods in the two second linear channels to drive the four anchor rods to extend from the rear and front regions of the two end faces respectively, thus the four anchor rods are driven by one actuating mechanism.

[0025] Preferably,

[0026] The inlet line segments of the two first linear channels are made to coincide, and the inlet line segments of the two second linear channels are made to coincide to form a common segment of the linear channels. Thus, the outlet line segments of the two first linear channels and the outlet line segments of the two second linear channels form two branch segments separated in the transition segment.

[0027] Two anchor bolts are stacked to form an anchor bolt pair, with the two anchor bolts in the pair joining together at the tail to form a joint section. The side teeth of the two anchor bolts are aligned, so that the anchor bolt pair can be inserted synchronously into the common section of the linear channel, and the aligned side teeth engage with the drive sleeve. Thus, the anchor bolt pair is driven by the drive sleeve, and the two anchor bolts extend from the two end faces through the branch section respectively.

[0028] Preferably, the anchor bolt has a rhomboid cross-section, and the linear channel has a rhomboid cross-section adapted to the anchor bolt; wherein:

[0029] The edge of the linear channel is radially connected to the mounting hole, and the side teeth are formed on the edge of the anchor rod.

[0030] Preferably, the two opposite edges of the anchor rod are provided with side teeth.

[0031] Preferably, the side teeth are right-angled trapezoidal teeth, with the straight tooth walls facing the tail of the anchor rod and the oblique tooth walls facing the head of the anchor rod.

[0032] Preferably, the anchor bolt has opposing acute-angled edges and obtuse-angled edges, and the side teeth are disposed on the acute-angled edges.

[0033] Compared with the prior art, the beneficial effects of the interbody fusion device with built-in anchoring elements disclosed in this invention are:

[0034] 1. Regarding the stability of postoperative anchoring: 1) Because each end face of the fusion cage has two anchor rods extending from its anterior and posterior regions for insertion into the vertebrae, each end face of the fusion cage has two anchor points in the anterior-posterior direction with respect to the endplate. These two anchor points effectively prevent the end face of the fusion cage from separating from the vertebral endplate during the patient's flexion and extension movements, thus improving the stability of the anchoring; 2) Because the anchor rods extend from the end face of the fusion cage under the guidance of the linear channel's lead-out straight segment, the anchor rods extend from the fusion cage body... During the process of inserting the anchor rod into the vertebra, the insertion direction remains unchanged. Therefore, the cross-section of the insertion hole will not be much larger than the cross-section of the anchor rod. This not only increases the reliability of the connection between the anchor rod and the vertebra, but also reduces the damage to the vertebral bone caused by the anchor rod. 3) The lateral teeth arranged on the anchor rod along the extension direction not only participate in driving the anchor rod, but also enter the vertebra after the anchor rod is inserted into the vertebra. After the operation, the new bone growing in the insertion hole enters the tooth groove between the lateral teeth, which will significantly increase the connection between the anchor rod and the vertebra, preventing the anchor rod from withdrawing from the vertebra.

[0035] 2. In terms of ease of operation and balance of force during the operation: 1) Only the operating instrument needs to be used to rotate the operating head of the actuation mechanism on the anterior side of the vertebra through the anterior approach, so that the four anchor rods can be inserted into the vertebra by extending from the anterior and posterior regions of the two end faces of the fusion body; 2) By making the anchor rods extend backward at an angle from the posterior region and forward at an angle from the anterior region of each end face of the fusion body at an angle, the force on the fusion body in the anterior and posterior directions is relatively balanced, thereby inhibiting the displacement of the fusion body during the operation to a certain extent.

[0036] 3. Rationality of structural configuration: By configuring lateral teeth on the anchor rod, which serves as an anchoring element for insertion into the vertebra, the anchor rod can participate in the transmission using its own structure, thereby avoiding the need to add a separate transmission component to drive the anchor rod, thus simplifying the structure. Furthermore, the lateral teeth, as a structure participating in the transmission, are also used to enhance the bonding ability between the anchor rod and the vertebra after surgery.

[0037] 4. By allowing the drive sleeve to move axially under certain elastic damping, all anchor bolts and the fusion unit body are finally fixed through the combination of two stepped surfaces, avoiding the inability of some anchor bolts to be fixed to the fusion unit body due to processing errors or meshing errors.

[0038] 5. In some preferred structures of the fusion device, four anchor bolts can be driven by simply turning the operating head of one actuation mechanism, thus simplifying the operation.

[0039] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0040] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0041] Figure 1 This is a state view of a fusion device and vertebral anchorage of a structural type in the prior art.

[0042] Figure 2 A state view of a fusion device with vertebral anchorage, representing another structural type in the prior art.

[0043] Figure 3A three-dimensional structural diagram of the interbody fusion device with a first specific structure provided for an embodiment of the present invention, viewed from the front.

[0044] Figure 4 A three-dimensional structural diagram of the interbody fusion device with a first specific structure provided for an embodiment of the present invention, viewed from the posterior side.

[0045] Figure 5 A frontal view of an interbody fusion device with a first specific structure provided for an embodiment of the present invention.

[0046] Figure 6 for Figure 5 AA-direction section view.

[0047] Figure 7 for Figure 5 This is a cross-sectional view along the CC axis.

[0048] Figure 8 A perspective view of the fusion body of an interbody fusion device with a first specific structure provided for an embodiment of the present invention.

[0049] Figure 9 This is a three-dimensional structural diagram of the actuation mechanism in the intervertebral fusion device provided in an embodiment of the present invention.

[0050] Figure 10 A view of the interbody fusion device with a first specific structure provided for an embodiment of the present invention when the anchor rod is pre-installed.

[0051] Figure 11 This is a three-dimensional structural diagram of the actuation mechanism and anchor bolt in an intervertebral fusion device with a first specific structure provided for an embodiment of the present invention.

[0052] Figure 12 This is a three-dimensional structural diagram of the anchor rod extending from the end face in the intervertebral fusion device of the first specific structure provided in the embodiment of the present invention.

[0053] Figure 13 A view showing the state of the anchor rod inserted into the vertebra in an intervertebral fusion device with a first specific structure provided for an embodiment of the present invention.

[0054] Figure 14 A perspective view of the fusion body of an intervertebral fusion device with a second specific structure provided in an embodiment of the present invention.

[0055] Figure 15 This is a three-dimensional structural diagram of the actuation mechanism and anchor pair in the intervertebral fusion device of the second specific structure provided in the embodiment of the present invention.

[0056] Figure 16A three-dimensional structural view of the intervertebral fusion device with the anchor rod protruding from the end face in a second specific structure provided in an embodiment of the present invention.

[0057] Figure 17 A view showing the state of the anchor pair extending from the end face in an intervertebral fusion device with a second specific structure provided in an embodiment of the present invention.

[0058] Figure label:

[0059] 10-Fusion device body; 11-End face; 121-Anterior wall; 122-Rear wall; 13-Side wall; 14-Bone graft window; 15-Protruding tip; 16-Clasp; 17-Mounting hole; 21-First linear channel; 211-Inlet straight segment; 2111-Inlet port; 212-Outlet straight segment; 2121-Outlet port one; 213-Transition segment; 22-Second linear channel; 221-Inlet straight segment; 2211-Inlet port; 222 - Straight line segment; 2221 - Extrusion port two; 223 - Transition segment; 30 - Anchor bolt; 31 - Side tooth; 32 - First limiting step; 33 - Connecting segment; 34 - Wedge surface; 40 - Actuation mechanism; 41 - Operating head; 42 - Rotating rod; 421 - Intermediate limiting shaft; 422 - Front limiting shaft; 423 - Rear limiting shaft; 43 - Drive sleeve; 431 - Front drive sleeve; 432 - Rear drive sleeve; 433 - Helical tooth groove; 44 - Elastic component.

[0060] 1000 - Vertebra; 1001 - Endplate. Detailed Implementation

[0061] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0062] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0063] This invention discloses an intervertebral fusion device, which is anchored to two vertebrae 1000 by means of an anchor rod 30 passing through the endplates 1001 of the two vertebrae 1000. The intervertebral fusion device provided by this invention is suitable for implantation into the intervertebral space of two vertebrae 1000 in anterior cervical discectomy and fusion surgery (hereinafter referred to as anterior cervical surgery).

[0064] like Figures 3 to 17 As shown, the intervertebral fusion device includes: a fusion device body 10, an anchor 30, and an actuation mechanism 40; before the intervertebral fusion device is placed in the intervertebral space, as... Figure 3 and Figure 4 As shown, the anchor 30 is pre-installed in the fusion device body 10. After the intervertebral fusion device body 10 is placed in a suitable position in the intervertebral space, as... Figure 12 and Figure 13 As shown, the anchor rod 30 is driven by the actuation mechanism 40, so that the anchor rod 30 extends out of the fusion device body 10 and is inserted into the vertebra 1000 through the endplate 1001.

[0065] The fusion device body 10 has two opposing end faces 11 (i.e., an upper end face and a lower end face). After the intervertebral fusion device is placed in the intervertebral space, the two end faces 11 of the fusion device body 10 face towards the endplates 1001 of the two vertebrae 1000 and are used to contact the two endplates 1001. A bone graft window 14 is disposed on the fusion device body 10, penetrating the two end faces 11. The bone graft window 14 is pre-filled with bone tissue and / or bone growth promoting material (not shown) to promote the growth of new bone in the endplates 1001 to promote the fusion of the vertebrae 1000 and improve the fusion effect. With the anterior, posterior, left, and right sides of the cervical vertebrae as references, the intervertebral fusion device body 10 is positioned as follows: The walls of the fusion device body 10 at the two end faces 11 include a front wall 121, a rear wall 122, and two side walls 13 (i.e., the left side wall and the right side wall) that are opposite each other. After the intervertebral fusion device is placed in the intervertebral space through the anterior cervical approach, the front wall 121 of the fusion device body 10 faces forward. The front wall 121 is the wall to which the delivery device is attached when delivering the fusion device. The side where the front wall 121 is located is also the side that is convenient for operation by operating devices such as the anchor 30. However, it is difficult for the operating device to operate on the side where the side wall 13 is located. It is easy to understand that the operating device cannot operate on the side where the rear wall 122 is located. In some preferred configurations, a matrix of protrusions 15 are machined on the two end faces 11 of the fusion device body 10. After the fusion device body 10 is anchored to the vertebra 1000 via anchor rods 30, the protrusions 15 on the end faces 11 penetrate the endplates 1001 of the vertebra 1000 to inhibit displacement of the fusion device body 10 and stimulate the growth of new bone in the endplates 1001. In some preferred configurations, a latch 16 is provided in the middle of the anterior wall 121 of the fusion device body 10. During anterior cervical surgery, the fusion device body 10 is attached to the head of the delivery instrument via the latch 16 of the anterior wall 121, thereby allowing the delivery instrument to be placed in the intervertebral space.

[0066] like Figure 8 As shown, a set of linear channels is configured in the solid region of the fusion body 10 on each side of the bone graft window 14 (the so-called solid region is relative to the bone graft window 14, which is the hollowed-out region of the fusion body 10). That is, a set of linear channels is configured in the solid region between each side wall of the bone graft window 14 and each side wall 13 (left side wall and right side wall) of the fusion body 10. Thus, the fusion body 10 has two sets of linear channels located on the left and right sides of the bone graft window 14. Each set of linear channels includes four linear channels: two first linear channels 21 and two second linear channels 22. The two first linear channels 21 extend backward from the front wall 121 of the fusion body 10 and finally obliquely extend backward to the rear side region of the two end faces 11 of the fusion body 10, respectively. The two second linear channels 22 extend forward from the rear wall 122 of the fusion body 10 and finally obliquely extend backward to the front side region of the two end faces 11, respectively. Each first linear channel 21 includes an inlet straight segment 211 that penetrates the front wall 121 to form an inlet port 2111, an outlet straight segment 212 that penetrates the end face 11 to form an outlet port 2121, and an arc-shaped transition segment 213 that connects the inlet straight segment 211 and the outlet straight segment 212. The structure is the same as that of the first linear channel 21. Each second linear channel 22 includes an inlet straight segment 221 that penetrates the rear wall 122 to form an inlet port 2211, an outlet straight segment 222 that penetrates the end face 11 to form an outlet port 2221, and an arc-shaped transition segment 223 that connects the inlet straight segment 221 and the outlet straight segment 222. Therefore, each configured linear channel has an inlet straight segment, a transition segment, and an outlet straight segment.

[0067] The fusion device body 10 can be made of PEEK (polyetheretherketone) or titanium alloy (e.g., Ti-6Al-4V). Preferably, PEEK is used to make the fusion device body 10, so that the intervertebral space achieves mechanical properties similar to the vertebra 1000 after fusion, and because it can be penetrated by X-rays, it does not affect the postoperative imaging examination of bone fusion. If PEEK is used to make the fusion device body 10, the shape, linear channel, and related structures such as the mounting hole 17, which will be described below, can be obtained by injection molding, machining, or a combination of injection molding and machining. For example, when using injection molding, the linear channel is obtained after injection molding by pre-embedding a pre-embedded part that is structurally compatible with the linear channel. When using machining, the mounting hole 17, which will be described below, is obtained by drilling.

[0068] Mounting holes 17 are machined in the solid area where each group of linear channels is located. The mounting holes 17 extend in the front-back direction and at least penetrate the front wall 121 of the fusion body 10. Each linear channel in each group of linear channels corresponds to a mounting hole 17 and is located on both sides of the mounting hole 17 in the left-right direction. Furthermore, the lead-in straight segment of the linear channel is radially connected to the mounting hole 17. That is, the lead-in straight segment 211 of each first linear channel 21 located on the front side is radially connected to the front hole segment of the mounting hole 17, and the lead-in straight segment of each second linear channel 22 located on the rear side is radially connected to the rear hole segment of the mounting hole 17.

[0069] like Figure 7 and Figure 13 As shown, the linear channel is used for pre-insertion of the anchor bolt 30 and for guiding the anchor bolt 30 so that it extends from the end face 11. For example... Figure 10 As shown, the anchor bolt 30 is a straight rod before being inserted into the linear channel, such as... Figures 3 to 5 and combined Figure 6 As shown, the cross-section of the anchor rod 30 matches the cross-section of the linear channel. A row of side teeth 31 is formed on the surface of the anchor rod 30 adjacent to the mounting hole 17 (i.e., the surface of the anchor rod 30 on one side of the mounting hole 17 after it is inserted into the linear channel). After the anchor rod 30 enters the linear channel from its inlet port, the side teeth 31 of the anchor rod 30 radially enter the mounting hole 17 due to the connection between the straight section of the linear channel and the mounting hole 17. Specifically, as shown... Figure 10 As shown, after the anchor rod 30 enters the first linear channel 21 from its entry port 2111 located on the front wall 121 of the fusion body 10, and then enters the guide straight section 211 of the first linear channel 21 located on the front side of the fusion body 10, the side teeth 31 of the anchor rod 30 extend radially into the front section of the mounting hole 17 corresponding to the first linear channel 21. Similarly, after the anchor rod 30 enters the second linear channel 22 from its entry port 2211 located on the rear wall 122 of the fusion body, and then enters the second linear channel 22 from its entry port 2211 located on the rear side of the fusion body 10, the side teeth 31 of the anchor rod 30 extend radially into the rear section of the mounting hole 17 corresponding to the second linear channel 22. Figure 6 As shown, each mounting hole 17 corresponds to at least one first linear channel 21 and one second linear channel 22, so that the front and rear hole segments of each mounting hole 17 are respectively connected to the guide straight segment 211 of the first linear channel 21 and the guide straight segment 221 of the second linear channel 22.

[0070] like Figure 9 and Figure 11 and combined Figure 3 , Figure 6 and Figure 7As shown, the actuation mechanism 40 is disposed in the mounting hole 17. Each mounting hole 17 is provided with an actuation mechanism 40. Specifically, the actuation mechanism 40 includes an operating head 41 and an actuation body. The actuation body includes a rotating rod 42 and two drive sleeves 43. The rotating rod 42 passes through the mounting hole 17. The operating head 41 is fixed to the front end of the rotating rod 42 and exposed on the front side of the fusion device body 10 without protruding from the front wall 121 of the fusion device body 10. The operating head 41 is provided with a screwing operation part such as an internal hexagon countersunk groove so that a screwing tool can apply screwing to the operating head 41 from the front side of the vertebra 1000 to drive the rotating rod 42 to rotate. Two drive sleeves 43 are coaxially sleeved on the rotating rod 42 and are keyed together to restrict their rotation relative to the rotating rod 42, thus allowing them to rotate synchronously with the rotating rod 42. The two drive sleeves 43 are axially spaced apart, and are respectively located at axial positions corresponding to the inlet straight section 211 of the first linear channel 21 and the inlet straight section 221 of the second linear channel 22. Since the drive sleeve 43 corresponding to the inlet straight section 211 of the first linear channel 21 is closer to the front wall 121 of the fusion body 10, it can be called the front drive sleeve 431. Since the drive sleeve 43 corresponding to the inlet straight section 221 of the second linear channel 22 is closer to the rear wall 122 of the fusion body 10, it can be called the rear drive sleeve 432. Helical grooves 433 are formed on the outer circumferential surface of both drive sleeves 43, and the helical directions of the helical grooves 433 on the two drive sleeves 43 are opposite. Figure 6 As shown, after the two anchor rods 30 in a straight state extend from the front wall 121 and rear wall 122 of the fusion body 10 through the inlet port into the guide straight section 211 of the first linear channel 21 and the guide straight section 221 of the second linear channel 22, respectively, the side teeth 31 on the two anchor rods 30 that extend radially into the mounting holes 17 engage with the helical tooth grooves 433 on the front drive sleeve 431 and the rear drive sleeve 432 of the rotating rod 42, respectively. Thus, as... Figure 7 As shown, before the fusion device body 10 is placed in the intervertebral space, the front drive sleeve 431 and the rear drive sleeve 432 are rotated synchronously by turning the operating head 41. The spiral groove 433 on the drive sleeve 43 meshes with the side teeth 31 of the anchor rod 30, driving the corresponding anchor rod 30 to advance along the linear channel. When the head section of the anchor rod 30 is driven and passes through the transition section of the linear channel, the transition section forces the anchor rod 30 to elastically deform and turn into the straight section leading out of the linear channel, thereby achieving the pre-positioning of the anchor rod 30 in the fusion device body 10; as Figures 11 to 13As shown, after the fusion device body 10 is placed at a predetermined position in the intervertebral space, the drive sleeve 43 continues to drive the anchor rod 30 by continuing to rotate the operating head 41, thereby causing the head section of the anchor rod 30 to extend from the ejection port 2121 of the end face 11 of the fusion device body 10 and be inserted into the vertebra 1000 through the endplate 1001. That is, the anchor rod 30 located in the first linear channel 21 is driven by the front drive sleeve 431 and extends obliquely backward from the rear side region of the end face 11 of the fusion device body 10, and the anchor rod 30 located in the second linear channel 22 is driven by the rear drive sleeve 432 and extends obliquely forward from the front side region of the end face 11 of the fusion device body 10. Thus, the actuation mechanism 40 drives the four anchor rods 30 so that the four anchor rods 30 enter the two first linear channels 21 and the two second linear channels 22 before the fusion device is placed in the intervertebral space, and after the fusion device is placed in the intervertebral space, the four anchor rods 30 extend from the front and rear regions of the two end faces 11 respectively and insert into the two vertebrae 1000, thereby realizing the anchoring of the fusion device body 10 to the two vertebrae 1000.

[0071] It should be noted that each linear channel, including the transition section and the leading straight section, extends towards the end face 11 of the fusion body 10 while also extending radially away from the mounting hole 17 to avoid interference between the anchor rod 30 and the symmetrical drive sleeve 43. For example, to avoid interference between the anchor rod 30 located in the first linear channel 21 and the drive sleeve 43 used to drive the anchor rod 30 in the second linear channel 22, and to avoid interference between the anchor rod 30 located in the second linear channel 22 and the drive sleeve 43 used to drive the anchor rod 30 in the first linear channel 21.

[0072] The interbody fusion device provided by this invention has at least the following advantages:

[0073] 1. Regarding the stability of postoperative anchoring: 1) Because each end face 11 of the fusion device body 10 has two anchor rods 30 extending from its anterior and posterior regions for insertion into the vertebral 1000, each end face 11 of the fusion device body 10 has two anchor points in the anterior-posterior direction with respect to the endplate 1001. These two anchor points effectively prevent the end face 11 of the fusion device body 10 from separating from the endplate 1001 of the vertebral 1000 during the patient's flexion and extension movements, thereby improving the stability of anchoring; 2) Because the anchor rods 30 extend from the end face 11 of the fusion device body 10 under the guidance of the linear channel's lead-out straight segment, the anchor rods 30 extend from the end face 11 of the fusion device body 10 and... During the insertion into vertebra 1000, the insertion direction of anchor rod 30 remains unchanged. Therefore, the cross-section of the insertion hole will not be much larger than the cross-section of anchor rod 30. This not only increases the reliability of the connection between anchor rod 30 and vertebra 1000 but also reduces the damage to the bone of vertebra 1000 caused by anchor rod. 3) The lateral teeth 31 arranged on anchor rod 30 along the extension direction not only participate in driving anchor rod 30, but also enter vertebra 1000 after anchor rod 30 is inserted into vertebra 1000. After surgery, the new bone growing in the insertion hole will significantly increase the connection between anchor rod 30 and vertebra 1000 after entering the tooth groove between lateral teeth 31, preventing anchor rod 30 from withdrawing from vertebra 1000.

[0074] 2. In terms of ease of operation and balance of force during the operation: 1) Only by using the operating instrument to rotate the operating head 41 of the actuation mechanism 40 on the anterior side of the vertebra 1000 through the anterior approach, the four anchor rods 30 can be inserted into the vertebra 1000 by extending from the anterior and posterior regions of the two end faces 11 of the fusion body 10; 2) By making the anchor rods 30 extend backward at an angle from the posterior region and forward at an angle from the anterior region of each end face 11 of the fusion body 10 at an angle, the force on the fusion body 10 in the anterior and posterior directions is relatively balanced, thereby inhibiting the displacement of the fusion body 10 during the operation to a certain extent.

[0075] 3. Rationality of structural configuration: By configuring side teeth 31 on the anchor rod 30, which is used as an anchoring element for insertion into the vertebra 1000, the anchor rod 30 can participate in the transmission by utilizing its own structure, thereby avoiding the need to add a separate transmission component to drive the anchor rod 30, thus simplifying the structure. Furthermore, the side teeth 31, as a structure participating in the transmission, are also used to enhance the bonding ability between the anchor rod 30 and the vertebra 1000 after surgery.

[0076] The anchor rod 30 is made of titanium alloy, for example, Ti-6Al-4V titanium alloy. The side teeth 31 on the anchor rod 30 are obtained by cutting. Preferably, side teeth 31 (not shown in the figure) are machined on both opposite sides of the anchor rod 30 to further enhance the bonding ability between the anchor rod 30 and the vertebra 1000 after insertion.

[0077] In some preferred structures, such as Figures 3 to 5 As shown, the cross section of the anchor rod 30 is configured as a rhombus. Preferably, the edges of the anchor rod 30 are blunted by machining chamfers. The cross section of the linear channel is also configured as a rhombus to match the anchor rod 30. Furthermore, one edge of the linear channel is radially connected to the corresponding mounting hole 17. The side teeth 31 on the anchor rod 30 are formed on its edge. Thus, the edge of the anchor rod 30 with the side teeth 31 radially enters the mounting hole 17 and engages with the drive sleeve 43. By configuring the cross-section of the anchor rod 30 and the linear channel into a matching rhomboid shape, the anchor rod 30 can be prevented from twisting during its advancement, and the meshing failure of the side teeth 31 with the helical grooves 433 on the drive sleeve 43 can be avoided due to its own twisting. Side teeth 31 are formed on the edge of the anchor rod 30, extending radially into the mounting hole 17, thereby increasing the radial extension of the anchor rod 30 into the mounting hole 17. This allows for a deeper configuration of the side teeth 31, which improves the meshing effect with the drive sleeve 43. Furthermore, the rhomboid cross-section of the anchor rod 30 allows for smoother insertion into the vertebral column 1000.

[0078] In some preferred structures, such as Figure 7 and Figure 11 As shown, a first limiting step 32 facing its head is machined on the anchor rod 30, and a second limiting step facing the opposite direction to the first limiting step 32 is machined on the linear channel corresponding to the anchor rod 30. When the anchor rod 30 is pushed forward by the engagement of the side teeth 31 with the helical groove 433 of the drive sleeve 43 until it is stopped on the second limiting step, the anchor rod 30 is restricted from further pushing. Therefore, the extension amount of the anchor rod 30 protruding from the end face 11 is limited by the two limiting steps, and the cooperation of the two limiting steps fixes the anchor rod 30 to the fusion body 10, thereby avoiding the limitation of the extension amount of the anchor rod 30 by the engagement between the side teeth 31 and the helical groove and the implementation of fixing the anchor rod 30. Preferably, the first limiting step 32 is formed on the edge of the anchor rod 30. For example, a chamfer is machined on the rear section of the edge of the anchor rod 30, and the starting position of the chamfer forms the first limiting step 32. A chamfer is driven to be machined on the rear side of the edge of the linear channel, and the starting position of the chamfer forms the second limiting step.

[0079] In some preferred structures, such as Figure 9As shown, each drive sleeve 43 is allowed to move axially relative to the rotating rod 42, that is, both the front drive sleeve 431 and the rear drive sleeve 432 are allowed to move axially relative to the rotating rod 42. For example, the drive sleeve 43 can be allowed to move axially by machining a spline groove extending axially on the rotating rod 42 and machining a spline on the inner wall of the drive sleeve 43, such that the spline and the spline groove mate, thereby allowing the drive sleeve 43 to move axially. Elastic members 44 are fitted on both sides of the rotating rod 42 in the axial direction of each drive sleeve 43. These elastic members 44 are used to apply a spring force to the drive sleeve 43, thereby allowing the drive sleeve 43 to move axially under a certain elastic damping. That is, two elastic members 44 are installed on both sides of the front drive sleeve 431, thereby allowing the front drive sleeve 431 to move axially after overcoming the spring force of the elastic members 44. Two elastic members 44 are installed on both sides of the rear drive sleeve 432, thereby allowing the rear drive sleeve 432 to move axially after overcoming the spring force of the elastic members 44. Preferably, the middle section of the rotating rod 42 is provided with a middle limiting shaft 421, and the two ends of the rotating rod 42 are respectively provided with a front limiting shaft 422 and a rear limiting shaft 423. The elastic members 44 on both sides of the front drive sleeve 431 stop between the front drive sleeve 431 and the middle limiting shaft 421 and the front limiting shaft 422, respectively. The two elastic members 44 of the rear drive sleeve 432 stop between the rear drive sleeve 432 and the middle limiting shaft 421 and the rear limiting shaft 423, respectively. Preferably, a disc spring is selected as the elastic member 44.

[0080] The advantage of allowing the drive sleeve 43 to move axially under certain elastic damping is that, due to machining errors and / or meshing errors, the following problems may occur when driving each anchor rod 30 to extend from the end face 11: When an anchor rod 30 cannot be further advanced because the first limiting step 32 has reached the corresponding second limiting step, while the first limiting step 32 of the remaining anchor rods 30 has not yet reached the corresponding second limiting step, if the drive sleeve 43 is not allowed to move axially relative to the rotating rod 42, the rotating rod 42 will be restricted from rotating, which will cause the first limiting step 32 of the remaining anchor rod 30 to ultimately fail to reach the corresponding second limiting step. The remaining anchor rods 30 can only be engaged with the fusion body 10 through meshing, and the anchor rods 30 will be affected by the meshing gap relative to the fusion body. The body 10 generates micro-movements, resulting in micro-movements between the fusion device body 10 and the vertebra 1000 after surgery. By allowing the drive sleeve 43 to move axially under certain elastic damping, even if a certain anchor rod 30 cannot be further advanced because the first limiting step 32 has reached the corresponding second limiting step, the rotating rod 42 can still rotate axially because the drive sleeve 43 used to drive the anchor rod 30 overcomes the elastic force of the corresponding elastic component 44, thereby driving the remaining anchor rods 30 to continue to advance so that the first step surface finally reaches the corresponding second limiting step. Thus, all the anchor rods 30 and the fusion device body 10 are finally fixed through the combination of the two step surfaces, avoiding the inability of some anchor rods 30 to be fixed to the fusion device body 10 due to processing errors or meshing errors.

[0081] The present invention provides two driving methods that enable four anchor rods 30 to extend from the end face 11 of the fusion body 10.

[0082] The first driving method.

[0083] like Figures 3 to 13As shown, the four anchors 30 in the four linear channels on each side of the bone graft window 14 are driven by two actuating mechanisms 40. Specifically, two mounting holes 17 are opened in the solid area on each side of the bone graft window 14, arranged vertically, and the two actuating mechanisms 40 are respectively installed in the two mounting holes 17. One of the four linear channels, the first linear channel 21 and one of the second linear channels 22, are located on both sides of the upper mounting hole 17, while the other first linear channel 21 and the other second linear channel 22 are located in the lower mounting hole 17. The actuating mechanisms installed in the upper mounting hole 17 are driven by the actuating mechanisms. The operating head 41 of the actuator 40 causes the corresponding front drive sleeve 431 and rear drive sleeve 432 to synchronously drive the two anchor rods 30 into the first linear channel 21 and the second linear channel 22 located above, and finally extend from the rear and front regions of the upper end face of the fusion body 10. The operating head 41 of the actuator 40 installed in the mounting hole 17 below rotates, causing the corresponding front drive sleeve 431 and rear drive sleeve 432 to synchronously drive the two anchor rods 30 into the first linear channel 21 and the second linear channel 22 located below, and finally extend from the rear and front regions of the lower end face of the fusion body 10. Thus, by sequentially turning the operating heads 41 of the two actuators 40, the four anchor rods 30 extend out from the upper and lower end faces of the fusion body 10 in pairs and are inserted into the vertebral 1000. In this method, two actuators 40 are required on each of the left and right sides of the bone graft window 14.

[0084] The second driving method.

[0085] like Figures 14 to 17As shown, the four anchors 30 in the four linear channels on each side of the bone graft window 14 are driven by only one actuation mechanism 40. Specifically, only one mounting hole 17 is opened in the solid area on each side of the bone graft window 14. The mounting hole 17 is approximately equidistant from the upper and lower end faces of the fusion body 10. Two of the four linear channels, the first linear channels 21, are located on the same side and on one side of the mounting hole 17 (e.g., the side closer to the bone graft window 14), and the two second linear channels 22 are located on the same side and on the side of the mounting hole 17. On the other side of 17 (e.g., the side near the sidewall 13 of the fusion body 10), the inlet straight segments 211 of the two first linear channels 21 overlap to form a common segment, while their outlet straight segments 212 are symmetrically arranged and pass through the upper and lower end faces of the fusion body 10 to form two branch segments. The inlet straight segments 221 of the two second linear channels 22 overlap to form a common segment, while their outlet straight segments 222 are symmetrically arranged and pass through the upper and lower end faces of the fusion body 10 to form two branch segments. Two anchor rods 30 are stacked to form an anchor rod pair, such that the two anchor rods 30 in the anchor rod pair are integrally joined at the tail to form a joint section 33, and the side teeth 31 of the two anchor rods 30 are aligned, so that the two anchor rod pairs can be synchronously inserted into the common section of the first linear channel 21 and the second linear channel 22 respectively, and the aligned side teeth 31 engage with the front drive sleeve 431 and the drive sleeve 43 respectively. Thus, by turning the operating head 41 of an actuation mechanism 40, the four anchor rods 30 of the two anchor rod pairs can be driven to extend from the two end faces 11 of the fusion body 10 respectively. Preferably, the two anchor rods 30 in the anchor rod pair can be obtained by cutting slits in the rod-shaped blank. Preferably, wedge-shaped surfaces 34 are cut on the adjacent sides of the heads of the two anchor rods 30 of the anchor rod pair so that they separate from each other when passing through the bifurcation of the two branch sections and enter the two branch sections respectively.

[0086] The significant advantage of the second driving method is that:

[0087] 1. The operation of four anchor bolts 30 can be simplified by simply turning the operating head 41 of one actuation mechanism 40.

[0088] 2. By having the two linear channels share a single inlet straight segment, the amount of material removed from the fusion body 10 is reduced, thereby reducing the impact of the mounting hole 17 and the linear channels on the support stiffness and strength of the fusion body 10.

[0089] 3. The two anchor bolts 30 of the anchor bolt pair are joined together at the tail, so that the two anchor bolts 30 restrain each other at the tail, thereby improving the firmness of the connection between the anchor bolt 30 and the fusion device body 10 after the anchor bolt 30 is inserted into the vertebra 1000.

[0090] In some preferred configurations, the mounting hole 17 extends not only to the front wall 121 of the fusion body 10 but also to the rear wall 122 of the fusion body 10. The rear end port of the mounting hole 17 is larger than the front end port of the mounting hole 17. The rotating rod 42, which is equipped with two drive sleeves 43, is inserted into the mounting hole 17 from the rear end port. A ball head is provided at the rear end of the rotating rod 42. After the rotating rod 42 is inserted into the mounting hole 17, an end cap is installed at the rear end of the mounting hole 17. The front end face 11 of the end cap is machined into a spherical surface to cooperate with the ball head, thereby allowing the rotating rod 42 to be driven by the operating head 41 at its front end to rotate.

[0091] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0092] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments may be used by those skilled in the art upon reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiment. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being possible in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0093] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. An interbody fusion device with built-in anchoring elements, characterized in that, include: The fusion device body has two end faces facing the endplates of the two vertebrae respectively, an anterior and posterior walls in the anterior-posterior direction between the two end faces, two lateral walls in the lateral direction, and a bone graft window penetrating the two end faces; each side of the fusion device body in the lateral direction of the bone graft window is provided with a linear channel, the linear channel including two first linear channels extending backward from the anterior wall and obliquely penetrating the posterior region of the two end faces respectively, and two second linear channels extending forward from the posterior wall and obliquely penetrating the anterior region of the two end faces respectively. An anchor bolt is pre-installed in each of the linear channels; The actuation mechanism includes an operating head exposed on the anterior wall of the fusion body for screwing and an actuation body located in the fusion body for driving the anchor rods. After the fusion body is placed in the intervertebral space, the actuation body drives the anchor rods in the first linear channel and the second linear channel to extend obliquely backward from the posterior region of the end face and obliquely forward from the anterior region of the end face, respectively, under the guidance of the linear channel, and inserts them into the vertebra through the endplate. The fusion body has a mounting hole extending in the front-to-back direction; the first linear channel and the second linear channel each have an inlet straight segment that corresponds to the front wall and the rear wall respectively to form an entry port, an outlet straight segment that corresponds to the two end faces respectively to form an exit port and is inclined relative to the inlet straight segment, and a transition segment connecting the inlet straight segment and the outlet straight segment; the inlet straight segment is adjacent to the mounting hole and radially penetrates it. The actuating body includes: a rotating rod that passes through a mounting hole and is driven to rotate by an operating head; two driving sleeves that are sleeved on the rotating rod and rotate with the rotating rod and are axially spaced apart, with helical tooth grooves on their outer peripheral surfaces; the two driving sleeves are respectively located at axial positions corresponding to the lead-in straight segments of the first linear channel and the second linear channel. The anchor rod is a straight rod before being inserted into the linear channel; at least on the outer peripheral surface of the anchor rod adjacent to the mounting hole, a row of side teeth is arranged at intervals along the extension direction of the anchor rod. After the head of the anchor rod is inserted from the inlet port of the linear channel into the lead-in straight section of the linear channel, the side teeth of the anchor rod radially enter the mounting hole and engage with the helical groove of the drive sleeve. Thus, the anchor rod is driven by the drive sleeve by the engagement and moves along the linear channel and extends out from the outlet port after passing through the lead-in straight section, the transition section and the exit straight section in sequence.

2. The interbody fusion device with built-in anchoring elements according to claim 1, characterized in that, A first limiting step is machined on the anchor bolt towards the head, and a second limiting step is machined on the linear channel towards the entry port. The first limiting step abuts against the second limiting step to limit the extension of the anchor bolt and to fix the anchor bolt in place; wherein: Each drive sleeve is fitted onto the rotating rod in a manner that allows it to move axially relative to the rotating rod while restricting its rotation; An elastic component is fitted on both sides of the rotating rod in the axial direction of each drive sleeve. The elastic component is used to apply elastic force to the drive sleeve and allow the drive sleeve to overcome the elastic force and move axially relative to the rotating rod.

3. The interbody fusion device with built-in anchoring elements according to claim 1, characterized in that, Each side of the fusion unit body of the bone graft window has two mounting holes arranged vertically; each side of the fusion unit body of the bone graft window is equipped with two actuation mechanisms, and the actuation bodies of the two actuation mechanisms are respectively installed in the two mounting holes; wherein: Each mounting hole has a first linear channel and a second linear channel arranged on both sides in the left and right directions; the two drive sleeves on the rotating rod of the actuating body respectively engage with the side teeth of the anchor rod in the first linear channel and the second linear channel on the left and right sides of the mounting hole where the actuating body is located, so as to drive the two anchor rods to extend obliquely from the rear and front regions of the end face adjacent to the mounting hole in a synchronized manner. Thus, the four anchor rods are driven by two actuation mechanisms.

4. The interbody fusion device with built-in anchoring elements according to claim 1, characterized in that, Each side of the fusion body of the bone graft window has an installation hole; each side of the fusion body of the bone graft window is equipped with an actuation mechanism, and the actuation body of the actuation mechanism is installed in the installation hole. Two first linear channels and two second linear channels are arranged on both sides of the mounting hole in the left-right direction, with the two first linear channels on the same side and the two second linear channels on the same side; the two drive sleeves on the rotating rod of the actuating body simultaneously mesh with the side teeth of the two anchor rods in the two first linear channels and the two anchor rods in the two second linear channels to drive the four anchor rods to extend from the rear and front regions of the two end faces respectively, thus the four anchor rods are driven by one actuating mechanism.

5. The interbody fusion device with built-in anchoring elements according to claim 4, characterized in that, The inlet line segments of the two first linear channels are made to coincide, and the inlet line segments of the two second linear channels are made to coincide to form a common segment of the linear channels. Thus, the outlet line segments of the two first linear channels and the outlet line segments of the two second linear channels form two branch segments separated in the transition segment. Two anchor bolts are stacked to form an anchor bolt pair, with the two anchor bolts in the pair joining together at the tail to form a joint section. The side teeth of the two anchor bolts are aligned, so that the anchor bolt pair can be inserted synchronously into the common section of the linear channel, and the aligned side teeth engage with the drive sleeve. Thus, the anchor bolt pair is driven by the drive sleeve, and the two anchor bolts extend from the two end faces through the branch sections respectively.

6. The interbody fusion device with built-in anchoring elements according to claim 1, characterized in that, The anchor bolt has a rhombus-shaped cross-section, and the linear channel has a rhombus-shaped cross-section adapted to the anchor bolt; wherein: The edge of the linear channel is radially connected to the mounting hole, and the side teeth are formed on the edge of the anchor rod.

7. The interbody fusion device with built-in anchoring elements according to claim 6, characterized in that, The anchor rod has side teeth on both opposite edges.

8. The interbody fusion device with built-in anchoring elements according to claim 1, characterized in that, The side teeth are right-angled trapezoidal teeth, with the straight tooth walls facing the tail of the anchor rod and the oblique tooth walls facing the head of the anchor rod.

9. The interbody fusion device with built-in anchoring elements according to claim 6, characterized in that, The anchor has opposing acute-angled edges and obtuse-angled edges, and the side teeth are disposed on the acute-angled edges.

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