An intervertebral fusion device

Abstract

This patent relates to an intervertebral fusion device, which includes a fusion device body. The fusion device body includes a bone graft body, an instrument body, and a connection component. The bone graft body is connected to the instrument body through the connection component, and the bone graft body and the instrument body are arranged along the length direction of the fusion device body; the length of the fusion device body is adjusted through the connection component. The present invention realizes the adjustable length of the fusion device, can avoid the replacement of the patient's surgical position during the operation and the removal of improperly selected implants during the operation, improves the fusion rate, and effectively reduces postoperative subsidence.

Description

Technical Field

[0001] This patent belongs to the technical field of medical devices, and relates to an intervertebral fusion device, specifically to an intervertebral fusion device with adjustable length. Background Art

[0002] Spinal interbody fusion is a common technique for treating spinal diseases, including lumbar disc herniation, degenerative lesions, etc., and is a classic surgical method for treating various spinal diseases. Clinically, an intervertebral fusion device is usually implanted as a bone graft fusion carrier to establish and maintain spinal stability, and restore the intervertebral height and spinal physiological curvature.

[0003] An ordinary intervertebral fusion device consists only of a body. After being implanted into the intervertebral space, internal fixation (screw-rod) needs to be applied to maintain its stability. In the series of cervical fusion devices, there already exist self-stabilizing cervical fusion devices or zero-profile cervical fusion devices, but their models are single. During the operation, due to the different sizes of patients' spinal columns, the single-type fusion device cannot match well with the patients' intervertebral discs, resulting in poor fusion between the upper and lower vertebral bodies, and thus causing slippage of the upper and lower vertebral bodies. In addition, there are few self-stabilizing or zero-profile fusion devices in lumbar fusion devices. For conventional lateral lumbar interbody fusion devices, after being implanted into the human body, usually screw-rod internal fixation or screw-plate internal fixation needs to be added on the side, or the patient's surgical position needs to be changed to add screw-rod internal fixation at the back. This not only increases the operation time and the incidence of complications, but also exacerbates the patient's pain and cost. In addition, the lateral lumbar interbody fusion device is generally implanted at the outer edge (epiphyseal ring) of the vertebra, and the design of its length dimension is particularly important. Currently, there is no intervertebral fusion device with adjustable length in the length direction. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide an intervertebral fusion device to solve one or more of the problems of the existing intervertebral fusion devices, such as single model, inability to adjust the length of the fusion device, and high risk of postoperative chip or screw prolapse.

[0005] The object of the present invention is achieved as follows:

[0006] An intervertebral fusion device includes a fusion device body, the fusion device body includes a bone graft body, an instrument body and a connecting component, the bone graft body is connected to the instrument body through the connecting component, and the bone graft body and the instrument body are arranged along the length direction of the fusion device body; the length of the fusion device body is adjusted through the connecting component.

[0007] In a preferred embodiment of the present invention, the intervertebral fusion device further includes a locking member; a locking member installation port is provided on the side wall end surface of the fusion device body, and locking member channels communicating with the locking member installation port are provided on both the upper surface and the lower surface of the fusion device body. The locking member is implanted into the vertebra at a reverse angle through the locking member installation port.

[0008] In a preferred embodiment of the present invention, a first connection hole is provided on the side wall end face of the bone graft body, a second connection hole is provided on the side wall end face of the instrument body, and the center lines of the first connection hole and the second connection hole coincide; the connection component is inserted into the first connection hole and the second connection hole to connect the bone graft body and the instrument body.

[0009] In a preferred embodiment of the present invention, the second connection hole is located on the side wall end face provided with the locking member mounting port.

[0010] In a preferred embodiment of the present invention, the number of both the first connection hole and the second connection hole is two, and the number of connection components is two.

[0011] In a preferred embodiment of the present invention, the connection component includes a driving rod, the driving rod includes a rod body and an operating part, and the rod body is a threaded rod; the first connection hole is a threaded hole, the second connection hole is a stepped hole, the stepped hole has a first hole diameter and a second hole diameter from the instrument body to the bone graft body direction, the diameter of the threaded rod is less than or equal to the second hole diameter, and the diameter of the operating part is greater than the second hole diameter and less than or equal to the first hole diameter.

[0012] In a preferred embodiment of the present invention, the connection component includes a track rod, the track rod has a first end and a second end, the first end is fixed in the first connection hole, the second end is fixed in the second connection hole, and can move along the length direction of the fusion device body in the second connection hole.

[0013] In a preferred embodiment of the present invention, a card slot is provided on the hole wall of the first connection hole, and a slideway is provided on the hole wall of the second connection hole; a first boss is provided at the first end, and the first boss is clamped in the card slot; a second boss is provided at the second end, and the second boss is slidably installed in the slideway.

[0014] In a preferred embodiment of the present invention, the track rod is of H-shaped structure and is made of titanium alloy metal material.

[0015] In a preferred embodiment of the present invention, blocking parts are provided at both ends of the slideway, and the blocking parts are used to limit the sliding range of the second boss.

[0016] In a preferred embodiment of the present invention, the locking member includes two universal self-locking screws.

[0017] In a preferred embodiment of the present invention, the locking member includes a fixed insert piece and a universal self-locking screw; a screw hole is provided at the tail end of the fixed insert piece, and the universal self-locking screw passes through the screw hole and is driven into the vertebra.

[0018] In a preferred embodiment of the present invention, the number of the fixed inserts is one, and the number of the universal self-locking screws is two; two screw holes are provided at the tail end of the fixed insert.

[0019] In a preferred embodiment of the present invention, an embedding groove is provided on the pore wall of the screw hole of the fixed insert, an elastic structure is arranged on the outer peripheral wall of the head of the universal self-locking screw, and the elastic structure can be clamped into the embedding groove.

[0020] In a preferred embodiment of the present invention, the fixed insert has a first surface and a second surface, the first surface is a convex surface, and the second surface is a concave surface.

[0021] In a preferred embodiment of the present invention, convex teeth are provided on the first surface.

[0022] In a preferred embodiment of the present invention, the convex teeth are inclined towards the tail end of the fixed insert.

[0023] In a preferred embodiment of the present invention, the outer surface of the convex teeth is a convex arc surface.

[0024] In a preferred embodiment of the present invention, the number of the convex teeth is multiple and arranged in multiple rows.

[0025] In a preferred embodiment of the present invention, from the insertion end to the tail end of the fixed insert, the row spacing of the multiple rows of convex teeth gradually becomes smaller.

[0026] In a preferred embodiment of the present invention, the insertion end of the fixed insert is a wedge-shaped structure, and a V-shaped opening is provided at the central part of the wedge-shaped structure.

[0027] In a preferred embodiment of the present invention, a limiting rod is provided at the tail end of the fixed insert, and the limiting rod is used to clamp the tail end of the fixed insert in the locking member mounting port.

[0028] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0029] a) For the intervertebral fusion device provided by the present invention, the fusion device body is innovatively set as a length-adjustable structure, which can be applied not only to a specific segment such as the cervical vertebra or lumbar vertebra, and can effectively solve the problem that due to the single type of traditional fusion device, it is impossible to flexibly select an appropriate length during the operation, avoiding the replacement of the surgical position of the patient during the operation and the removal of the implant selected inappropriately during the operation, improving the fusion rate, and effectively reducing postoperative subsidence.

[0030] b) The intervertebral fusion device provided by the present invention connects the bone graft body and the instrument body by using a driving rod and a track rod. Specifically, the driving rod is connected to the built-in threaded hole of the instrument body through the bone graft body. The track rod is used to restrict the relative rotation of the bone graft body and the instrument body and guide the relative free movement of the bone graft body and the instrument body along the length direction of the fusion device. This structural setting only needs to control the rotation and advancement of one driving rod to conveniently and quickly adjust the relative distance between the bone graft body and the instrument body, thereby realizing the rapid and precise adjustment of the length of the fusion device body 1.

[0031] c) For the intervertebral fusion device provided by the present invention, the hole position used by the driving rod is exactly the operation hole of the holder. On the basis of ensuring the normal use of the fusion device, it is strengthened so that it can also be used for length adjustment. This hole position setting has two advantages and can reduce the complexity of the operation.

[0032] d) The intervertebral fusion device provided by the present invention adopts the combination of inserts and screws. By locking each other between the fixed insert and the universal self-locking screw, the fixed insert can be embedded into the end plate and locked with the universal self-locking screw to form an effective anti-withdrawal. It can not only effectively solve the risk of the screw or insert slipping out or shifting after surgery, but also overcome the defects that the existing fusion devices using insert design are all anti-withdrawal at both wings, which are difficult to insert, and the two wings are easy to break or bend. Moreover, the doctor can not only adjust the screw angle according to the actual needs during the operation and select a suitable screw-in angle, but also effectively solve the problem that it is difficult to adjust the position of the insert or the fusion device body during the operation to meet the complex situations during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present specification. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0034] Figure 1 Structural schematic of the intervertebral fusion device of the present invention Figure 1 ;

[0035] Figure 2 Structural schematic of the intervertebral fusion device of the present invention Figure 2 ;

[0036] Figure 3 Structural schematic of the intervertebral fusion device of the present invention Figure 3 ;

[0037] Figure 4 Structural schematic diagram of the disassembled intervertebral fusion device of the present invention;

[0038] Figure 5Schematic structure of the fusion device body of the present invention Figure 1 ;

[0039] Figure 6 Schematic structural diagram of the bone graft body of the fusion device body of the present invention;

[0040] Figure 7 End side view of the instrument body of the fusion device body of the present invention;

[0041] Figure 8 Schematic cross-sectional structure of the fusion device body of the present invention Figure 1 ;

[0042] Figure 9 Schematic cross-sectional structure of the fusion device body of the present invention Figure 2 ;

[0043] Figure 10 Schematic structural diagram of the track rod assembly of the present invention;

[0044] Figure 11 Schematic structure of the fixed insert of the present invention Figure 1 ;

[0045] Figure 12 Schematic structure of the fixed insert of the present invention Figure 2 ;

[0046] Figure 13 Schematic structural diagram of the universal self-locking screw of the present invention;

[0047] Figure 14 Schematic structure of the intervertebral fusion device of the present invention Figure 4 ;

[0048] Figure 15 Schematic internal structure diagram of the intervertebral fusion device of the present invention;

[0049] Figure 16 Schematic diagram of the cooperation and interlocking of the universal self-locking screw and the insert of the present invention;

[0050] Reference numerals:

[0051] 1 - Fusion device body; 11 - Bone graft body; 12 - Drive rod; 13 - Track rod; 14 - Operating part; 15 - Connection end face; 16 - Instrument body; 2 - Fixed insert; 21 - Convex teeth; 22 - Embedded groove; 3 - Universal self-locking screw; 31 - Elastic structure. Detailed implementation manners

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0053] For ease of understanding the embodiments of this application, the following will further explain and illustrate with specific embodiments in conjunction with the accompanying drawings. The embodiments do not constitute a limitation to the embodiments of this application.

[0054] Embodiment 1

[0055] A specific embodiment of the present invention, as Figures 1-3 shown, discloses an intervertebral fusion device, including a fusion device body 1, the length of the fusion device body 1 is adjustable, as Figures 4-10 shown, the fusion device body 1 includes a bone graft body 11, an instrument body 16, and a connection component. The bone graft body 11 is connected to the instrument body 16 through the connection component, and the bone graft body 11 and the instrument body 16 are arranged along the length direction of the fusion device body 1.

[0056] By adjusting the connection component to control the distance between the bone graft body 11 and the instrument body 16, the length adjustment of the fusion device body 1 can be conveniently and quickly achieved, overcoming the defect that the traditional fusion device with two parts arranged up and down can only adjust the height of the fusion device and cannot adjust the length of the fusion device, resulting in the inability to meet the need for precise adjustment of the length of the fusion device during lateral lumbar spine treatment.

[0057] In this embodiment, the intervertebral fusion device further includes a locking member. A locking member installation port is provided on the side wall end face of the fusion device body 1. The locking member installation port is provided on the side wall end face of the instrument body 16 of the fusion device body 1. Locking member channels communicating with the locking member installation port are provided on both the upper surface and the lower surface of the fusion device body 1. The locking member is implanted into the vertebra at a reverse angle through the locking member installation port.

[0058] Specifically, the locking member adopts a universal self-locking screw 3. The number of the universal self-locking screws 3 is 2. The two universal self-locking screws 3 are implanted into the vertebra at a reverse angle through the locking member installation port.

[0059] In a preferred embodiment of this embodiment, a first connection hole and a second connection hole are respectively provided on the side wall end faces of the bone graft body 11 and the instrument body 16. The center lines of the first connection hole and the second connection hole coincide. The second connection hole is located on the side wall end face provided with the locking member installation port. Among them, the first connection hole is a blind hole, the second connection hole is a through hole, and the second connection hole penetrates along the length direction of the instrument body 16.

[0060] Among them, the connecting component as a whole is a rod-shaped structure. The connecting component can be inserted into the first connecting hole and the second connecting hole. The connecting component passes through the second connecting hole and penetrates into the first connecting hole to connect the bone graft body 11 and the instrument body 16. By adjusting the connecting component, the distance between the bone graft body 11 and the instrument body 16 is controlled, so as to realize the length adjustment of the fusion device body 1.

[0061] In a preferred embodiment of this embodiment, the number of the first connecting hole and the second connecting hole is two. That is to say, the fusion device main body 1 is provided with two groups of connecting holes. Correspondingly, two connecting components are used to connect the bone graft body 11 and the instrument body 16. One connecting component is installed in each group of connecting holes. Each group of connecting holes includes a first connecting hole and a second connecting hole with coincident center lines. And the two second connecting holes are located on both sides of the locking member installation opening. This structural setting can prevent the bone graft body 11 and the instrument body 16 of the fusion device body 1 from rotating relative to each other, and ensure the structural stability of the fusion device main body 1.

[0062] Since the side wall of the conventional fusion device body 1 is provided with a holding device operation hole for holding the fusion device, the holding device operation hole includes a first operation hole and a second operation hole, and the first operation hole and the second operation hole are located on both sides of the locking member installation opening. Therefore, in a preferred embodiment of this embodiment, the first holding device operation hole and the second holding device operation hole on the fusion device body 1 correspond to the two second connecting holes provided on the side wall end surface of the instrument body 16. That is to say, the connecting component of the present application makes full use of the holding device operation hole on the fusion device body 1, and the structure of the operation hole can be improved adaptively according to the structure of the connecting component. The fusion device length adjustment hole position is set as the holding device operation hole. At the same time, the fusion device length adjustment hole position is also a structure that cooperates with the holding device. This structure can not only adjust the length of the fusion device body 1, simplify the structure of the fusion device, is convenient to operate, but also reduces the complexity of the operation.

[0063] In this embodiment, the connection mode of the connecting component with the first connecting hole and the second connecting hole can adopt plug-in connection, threaded connection, or a connection mode combining plug-in and threaded connection. The connecting component includes a driving rod 12 and / or a track rod 13. The connecting component is built into the fusion device body 1. The bone graft body 11 and the instrument body 16 of the fusion device body 1 can be connected by two driving rods 12, or can be connected by two track rods 13, or can also adopt a connection mode combining one driving rod 12 and one track rod 13.

[0064] For the first connection method, the bone graft body 11 and the instrument body 16 of the fusion device body 1 are connected by means of screw connection. Specifically, the connection component includes two drive rods 12. The drive rod 12 includes a rod body and an operation part 14. The rod body is a threaded rod, the first connection hole is a threaded hole, and the external thread of the drive rod 12 is adapted to the internal thread of the first connection hole. The second connection hole is a stepped hole, which has a first hole diameter and a second hole diameter from the instrument body 16 towards the bone graft body 11. The diameter of the rod body of the drive rod 12 is less than or equal to the second hole diameter, and the diameter of the operation part 14 of the drive rod 12 is greater than the second hole diameter and less than or equal to the first hole diameter. The drive rod 12 is pre-installed in the fusion device body 1 to connect the bone graft body 11 and the instrument body 16. The front end of the drive rod 12 is located in the bone graft body 11 of the fusion device body 1, and the operation part 14 is located in the instrument body 16 of the fusion device body 1.

[0065] When it is necessary to increase the length of the fusion device body 1, simultaneously screw two drive rods 12. The drive rods 12 are screwed out within a certain thread length in the bone graft body 11, and the lengths of the two drive rods 12 screwed out are the same to adjust the distance that the fusion device body 1 needs to increase. During this process, the distance between the bone graft body 11 and the instrument body 16 changes, realizing the length adjustment of the fusion device body 1. By using the method of simultaneously screwing in and out of the two drive rods 12 in a spiral manner to adjust the length of the fusion device body, the length can be increased according to the actual needs of the fusion device body 1. By screwing the drive rod 12 for the corresponding number of turns, the precise control and adjustment of the length of the fusion device body 1 can be achieved.

[0066] It should be noted that when the bone graft body 11 and the instrument body 16 are connected by two drive rods 12, the operation part 14 cooperates with the screwing tool to complete the rotation and advancement and retreat of the two drive rods 12. Note that the two drive rods 12 are screwed for the same number of turns to ensure that the advancement and retreat distances of the two drive rods 12 are the same.

[0067] The second connection method is to connect the bone graft body 11 of the fusion device body 1 and the instrument body 16 by combining plug-in connection and threaded connection. The driving rod 12 is connected to the built-in threaded hole of the bone graft body 11 and the instrument body 16. In the initial state of the fusion device, the operating part 14 has been embedded in the instrument body 16. The driving rod 12 is pressurized by the surgical instrument and rotated forward and backward. It can move forward or backward in the built-in thread of the bone graft body 11 to complete the adjustment of the length of the fusion device body 1. Specifically, the connecting assembly includes a driving rod 12 and a track rod 13. The driving rod 12 and the track rod 13 are both built into the fusion device body 1. The fusion device body 1 is provided with two groups of connecting holes. The first group of connecting holes is the driving rod mounting holes, and the second group of connecting holes is the track rod mounting holes. The driving rod 12 is installed in the first group of connecting holes, and the track rod 13 is installed in the second group of connecting holes. The bone graft body 11 and the instrument body 16 of the fusion device body 1 are fastened together by the thread of the driving rod 12, wherein the structure and connection method of the driving rod 12 refer to the first connection method mentioned above; the track rod 13 is used to limit the relative rotation of the bone graft body 11 and the instrument body 16 of the fusion device body 1 and guide the bone graft body 11 and the instrument body 16 to move relatively freely along the length direction of the fusion device. This structural setting only needs to control the rotation and advance and retreat of a driving rod 12 to conveniently and quickly adjust the relative distance between the bone graft body 11 and the instrument body 16, thereby realizing rapid and precise adjustment of the length of the fusion device body 1. In addition, the hole used by the driving rod 12 is the operating hole of the holder. On the basis of ensuring the normal use of the fusion device, it is strengthened so that it can also be adjusted in length. This hole setting kills two birds with one stone.

[0068] To increase the length of the fusion device body 1, the drive rod 12 is rotated without changing the position of the operating portion 14. The bone graft body 11 moves forward, increasing the distance between the bone graft body 11 and the instrument body 16. When the bone graft body 11 moves forward to the desired position, the overall length of the fusion device body 1 is the desired length. If, during surgery, it is found that the length of the fusion device body 1 is adjusted too long and needs to be shortened, the instrument drive rod 12 is rotated in the opposite direction to reduce the distance between the instrument body 16 and the bone graft body 11 until the fusion device body 1 reaches the desired length.

[0069] In the second connection mode, the maximum adjustable range of the length of the fusion device body 1 is related to the structure of the driving rod 12 and the track rod 13. The adjustable fusion device length is designed as follows: Figures 4-9 shown.

[0070] The track rod 13 can have various structures, as long as it can cooperate with the drive rod 12 to limit the relative rotation of the bone graft body 11 and the instrument body 16, and can guide the bone graft body 11 and the instrument body 16 to move freely relative to each other along the length direction of the fusion device.

[0071] A preferred structure of the track rod 13 is as follows Figure 10 As shown, the track rod 13 is of H-shaped structure and made of titanium alloy metal material. For the track rod 13 of H-shaped structure, both ends thereof can undergo elastic deformation. The track rod 13 has a first end and a second end. The first end of the track rod 13 is fixed in the first connection hole on the bone graft body 11, and the second end of the track rod 13 is located in the second connection hole on the instrument body 16 and can move along the length direction of the fusion device body 1 in the second connection hole.

[0072] Furthermore, a clamping groove is provided on the pore wall of the first connection hole, and a sliding groove is provided on the pore wall of the second connection hole. A first boss is provided on the outer peripheral wall of the first end of the track rod 13, and a second boss is provided on the outer peripheral wall of the second end. During installation, squeeze the openings at both ends of the track rod 13, insert the first end of the track rod 13 into the first connection hole of the bone graft body 11, and insert the second end of the track rod 13 into the second connection hole of the instrument body 16. After insertion, both ends of the track rod 13 reset. The first boss is fixedly clamped in the clamping groove of the first connection hole, and the second boss is slidably installed in the sliding groove of the second connection hole. Moreover, blocking parts are provided at both ends of the sliding groove to limit the sliding distance of the second boss in the sliding groove of the second connection hole and can also prevent the second end of the track rod 13 from being disengaged from the second connection hole, ensuring that the bone graft body 11 and the instrument body 16 always maintain a connected state, avoiding disengagement during the operation, and ensuring the working reliability of the fusion device. In addition, this structural arrangement can also limit the length adjustment range of the bone graft body 11 and the instrument body 16.

[0073] Another preferred structure of the track rod 13 is that the first end of the track rod 13 is integrally formed with the fusion device body, and the second end is provided with an opening, being a semi-H-shaped elastic structure. The length adjustment mechanism of the semi-H-shaped track rod 13 is the same as that of the H-shaped track rod 13. That is to say, the track rod 13 does not need to be separately processed and then built into the body 1. The track rod 13 is integrally processed with the bone graft body 11. The first end of the track rod 13 is already fixed inside the bone graft body 11, and the second end is provided with an opening, being a semi-H-shaped structure. Moreover, a slide rail is provided in the instrument body 16, and the relative distance between the bone graft body 11 and the instrument body 16 can be adjusted by adjusting the semi-H-shaped structure at the second end, thereby completing the length adjustment of the fusion device body 1.

[0074] In a preferred implementation manner of this embodiment, both the fusion device body 1 and the track rod 13 are made of PEEK material.

[0075] Compared with the prior art, the intervertebral fusion device of this embodiment has at least the following beneficial effects:

[0076] 1. When using the fusion device of this embodiment, the length of the fusion device body 1 is adjustable, and it can be applied not only to a specific segment such as the cervical vertebra or lumbar vertebra, and can effectively solve the problem that due to the single type of traditional fusion devices, it is impossible to flexibly select an appropriate length during the operation.

[0077] 2. The fusion device length adjustment hole positions are set for its holding tool holes. This structure can not only adjust the length but also be a structure for cooperating with the holding tool, which can reduce the complexity of the operation.

[0078] Embodiment 2

[0079] Another specific embodiment of the present invention is as Figures 1-4 、 Figures 14-16 shown, and discloses an intervertebral fusion device, including a fusion device body 1 and a locking member; wherein, the locking member includes a fixed insert 2 and a universal self-locking screw 3, the tail end of the fixed insert 2 is provided with a screw hole, and the screw hole is for the universal self-locking screw 3 to pass through and drive into the vertebra; the side wall end surface of the fusion device body 1 is provided with a locking member installation port, the upper surface and the lower surface of the fusion device body 1 are respectively provided with a screw penetration channel and a fixed insert penetration channel, the screw penetration channel and the fixed insert penetration channel are both communicated with the locking member installation port, and the fixed insert 2 and two universal self-locking screws 3 are implanted into the vertebra through the locking member installation port and passing through the locking member channel at a reverse angle.

[0080] Utilize the mutual locking of the fixed insert 2 and the universal self-locking screw 3 to achieve the self-stabilizing design of the fusion device, that is, while locking the fusion device through the universal self-locking screw 3, it can also achieve the re-locking of the insert. The fixed insert 2 and the universal self-locking screw 3 form an interactive locking structure to achieve the self-stabilization of the fusion device, avoiding the detachment of the universal self-locking screw 3 or the fixed insert 2 during the use of the fusion device, and greatly improving the stability of the fusion device.

[0081] In a preferred implementation manner of this embodiment, the locking member includes a fixed insert 2 and a universal self-locking screw 3, a screw hole is provided on the fixed insert 2, and one fixed insert 2 and one universal self-locking screw 3 can achieve the fixation and locking of the fusion device, reducing the number of screws and making the operation more convenient.

[0082] In a preferred implementation manner of this embodiment, the locking member includes a fixed insert 2 and two universal self-locking screws 3, two screw holes are arranged in parallel on the fixed insert 2, and the self-locking structure formed by the two universal self-locking screws and the fixed insert 2 has better stability.

[0083] In this embodiment, the fixed insert 2 has a first surface and a second surface; the first end of the fixed insert 2 is the head end, that is, the insertion end, and the second end of the fixed insert 2 is the tail end, that is, the limiting end. The limiting end is provided with a screw hole for the universal self-locking screw 3 to pass through and be driven into the upper vertebral body. At the same time, the side end face of the limiting end is also provided with a limiting rod. The size of the limiting rod is larger than the size of the mounting opening of the outer end face of the instrument body 16, so that the limiting end of the fixed insert 2 is stuck in the mounting opening, which plays a limiting role.

[0084] In a preferred implementation of this embodiment, the first surface of the fixing insert 2 is a convex surface, and a convex tooth 21 is provided on the convex surface. The convex tooth 21 can be stuck in the vertebra to prevent the fixing insert 2 from falling off, thereby playing a fixing and anti-retreat role; the second surface of the fixing insert 2 is a concave surface, and the concave surface is a smooth surface.

[0085] Furthermore, the protruding teeth 21 are tilted toward the rear end of the fixing insert 2. The protruding teeth 21 are triangular protrusions, with the rear end of the protruding teeth 21 fixedly connected to the first surface of the fixing insert 2, and the end of the protruding teeth 21 tilted toward the rear end of the fixing insert 2. Preferably, the outer surface of the protruding teeth 21 is convex. That is, when the fixing insert 2 is inserted into the vertebra, the contact surface between the protruding teeth 21 and the vertebra is convex. This structural arrangement allows the insert to be smoothly inserted into the vertebra in an arc, reducing patient discomfort.

[0086] In a preferred implementation of this embodiment, the first surface of the fixing insert 2 is provided with multiple rows of convex teeth, and each row of convex teeth is evenly provided with multiple convex teeth 21; from the insertion end to the tail end of the fixing insert 2, the row spacing of the multiple rows of convex teeth gradually decreases. By providing multiple rows of convex teeth with gradually decreasing row spacing, not only can the fixing insert 2 be smoothly inserted into the vertebra, but the area of the convex teeth embedded in the vertebral body is more concentrated, so that the stability of the insert after being driven into the lower vertebral body is better, the anti-retreat effect of the fixing insert 2 is improved, and the patient's discomfort can be minimized to the greatest extent.

[0087] In a preferred implementation manner of this embodiment, the insertion end of the fixing insert 2 is a wedge-shaped structure, the front end of the wedge-shaped structure is narrow and the rear end is wide, and a V-shaped opening is provided at the center of the wedge-shaped structure, that is, the first end of the fixing insert 2 is provided with a V-shaped notch. When the fixing insert 2 is driven into the vertebral body, the V-shaped notch at the front end first contacts the vertebral body, and the contact area between the two ends of the V-shape and the vertebral body becomes smaller, making it easier to drive the insert and having better anti-slip performance after driving.

[0088] In a preferred embodiment of this embodiment, the screw hole of the fixing insert 2 is provided with an embedding groove 22, and the outer peripheral wall of the head of the universal self-locking screw 3 is provided with an elastic structure 31. The embedding groove 22 is adapted to the elastic structure 31 of the head of the universal self-locking screw 3, and the elastic structure 31 can be snapped into the embedding groove 22. When the universal self-locking screw 3 is driven through the screw hole of the fixing insert 2 and into the appropriate position in the vertebra, the elastic structure 31 of the screw head embeds into the embedding groove 22 of the fixing insert 2, completing the self-locking of the universal self-locking screw 3. The locking of the universal self-locking screw 3 also provides a secondary locking of the fixing insert 2. This dual locking mechanism of the fixing insert 2 and the universal self-locking screw 3 ensures the self-stabilization performance of the fusion device designed. The embedding groove 22 in the screw hole wall cooperates with the elastic structure 31 of the screw head to create a micro-motion design between the universal self-locking screw 3 and its embedding groove 22, achieving a dynamic compression effect, ensuring sufficient load stimulation of the bone graft, thereby improving the fusion rate.

[0089] The method of use is as follows: After the initial fusion device is placed in the patient's appropriate intervertebral position, the device length is adjusted to the appropriate position. The fixation insert 2 is first driven into the lower vertebral body to initially secure the device. Two universal self-locking screws 3 are then sequentially driven through the upper screw holes of the fixation insert 2 into the upper vertebral body, with the two universal self-locking screws 3 being driven in any order. Once the universal self-locking screws 3 reach the appropriate position, the elastic structure 31 of the head of the universal self-locking screw 3 engages with the insertion groove 22 in the screw hole of the fixation insert 2, completing the locking of the device while also achieving a secondary locking of the insert.

[0090] Compared with existing fusion devices that use a single screw or a single insert, the fusion device of this embodiment uses a structural design that interlocks a fixed insert with a universal self-locking screw, which has significant advantages, specifically:

[0091] 1. The combination of inserts and screws is adopted. By locking the fixed inserts with the universal self-locking screws, the fixed inserts can be embedded in the end plates and locked with the universal self-locking screws to effectively prevent retreat. This not only effectively solves the risk of postoperative screw or insert dislocation or displacement, but also overcomes the defects of existing fusion devices designed with inserts, which all have two wings for retreat prevention, which are difficult to insert and the two wings are easy to break or bend.

[0092] 2. By using the fusion device of this embodiment, the doctor can not only adjust the screw angle and select the appropriate screw insertion angle according to the actual needs during the operation, but also effectively solve the problem of difficulty in adjusting the position of the insert or the fusion device body during the operation to meet complex intraoperative conditions.

[0093] 3. The upper surface of the fixing insert adopts a convex tooth design. The fixing insert is first driven into the lower vertebral body for fixation. The convex teeth can be stuck in the vertebra to prevent the fixing insert from falling off, playing a role in fixing and preventing retreat.

[0094] 4. By providing an embedding groove on the hole wall of the screw hole of the fixed insert and an integral elastic structure on the outer peripheral wall of the head of the universal self-locking screw, when the universal self-locking screw passes through the screw hole on the fixed insert and is driven into the appropriate position in the vertebra, the elastic structure of the screw head is embedded into the embedding groove of the head of the fixed insert, completing the self-locking of the universal self-locking screw. At the same time, the locking of the universal self-locking screw is also used to complete the secondary locking of the fixed insert. Through the double locking mechanism of the fixed insert and the universal self-locking screw, the self-stability performance of the fusion device of this design is ensured. And because the embedding groove is provided on the hole wall of the screw hole and cooperates with the elastic structure of the screw head, there is a micro-movement design in position between the universal self-locking screw and its embedding groove, which can achieve the effect of dynamic compression, enabling the bone graft to receive sufficient load stimulation, thereby improving the fusion rate.

[0095] Embodiment 3

[0096] Another specific embodiment of the present invention is as Figures 1-4 、 Figures 14-15 shown, and discloses an intervertebral fusion device, including the fusion device body 1 of Embodiment 1 and the locking member of Embodiment 2, that is, the locking member includes a fixed insert 2 and a universal self-locking screw 3. Specifically, the fusion device body 1 includes a bone graft body 11, an instrument body 16 and a connecting component. The bone graft body 11 is connected to the instrument body 16 through the connecting component, and the bone graft body 11 and the instrument body 16 are arranged along the length direction of the fusion device body 1; the locking member includes a fixed insert 2 and a universal self-locking screw 3, and the tail end of the fixed insert 2 is provided with a screw hole for the universal self-locking screw 3 to pass through and be driven into the vertebra.

[0097] In this embodiment, a locking member installation port is provided on the side wall end surface of the fusion device body 1, and screw penetration channels and fixed insert penetration channels are respectively provided on the upper surface and the lower surface of the fusion device body 1. The screw penetration channel and the fixed insert penetration channel are both communicated with the locking member installation port, and the fixed insert 2 and the universal self-locking screw 3 are implanted into the vertebra at a reverse angle through the locking member installation port.

[0098] In a preferred embodiment of this embodiment, the locking member includes one fixed insert 2 and two universal self-locking screws 3. Two screw holes are arranged in parallel on the fixed insert 2. The self-locking structure formed by the two universal self-locking screws 3 and one fixed insert 2 has better stability.

[0099] In a preferred embodiment of the present embodiment, the bone graft body 11 and the instrument body 16 of the fusion device body 1 are connected by a combination of plug-in connection and threaded connection. Specifically, the connection component includes a driving rod 12 and a track rod 13. For the structures, connection relationships, and operation processes of the driving rod 12 and the track rod 13, refer to the relevant descriptions in Embodiment 1. This structural arrangement only requires controlling the rotation and advancement of one driving rod 12 to conveniently and quickly adjust the relative distance between the bone graft body 11 and the instrument body 16, thereby achieving rapid and precise adjustment of the length of the fusion device body 1.

[0100] The operation steps of using the intervertebral fusion device of this embodiment are as follows:

[0101] Step 1: During the operation, the doctor selects a suitable approach according to the patient and implants the fusion device in the initial state into the appropriate intervertebral space position. The fusion device is initially in an unadjusted state, and the track rod 13 is in a locked state. At this time, the fusion device body 1 is at its original shortest length.

[0102] Step 2: Determine whether the implanted length position of the fusion device is appropriate through X-ray imaging. If it is appropriate, there is no need to adjust the length; if the length position is inappropriate, the length needs to be adjusted.

[0103] When the original shortest length of the fusion device body 1 does not meet the patient's needs, the length of the fusion device body 1 needs to be adjusted. The doctor uses a corresponding surgical instrument to screw the built-in driving rod 12 so that the operating part 14 of the driving rod 12 abuts and presses against the connection end face 15 of the bone graft body 11, and controls the driving rod 12 to rotate forward and backward within a certain thread length. The driving rod 12 changes the position of the adjusting rod 13 by changing the thread position, thereby achieving the adjustment of the length increase and shortening of the fusion device body 1 within a certain range until the length of the fusion device is adjusted to the appropriate position.

[0104] Step 3: After adjusting the fusion device body 1 to the appropriate length, use the fixing insert 2 to drive it into the locking part installation port of the fusion device body 1 to complete the preliminary stabilization of the fusion device.

[0105] Step 4: Drive 2 universal self-locking screws 3 through the screw holes at the tail of the fixing insert 2 in sequence. When the screw positions are appropriate, the elastic structure of the head of the universal self-locking screw is embedded in the embedding groove in the screw hole of the fixing insert 2 to complete the self-locking of the universal self-locking screw 3, and at the same time, the locking of the universal self-locking screw 3 is also used to complete the secondary locking of the fixing insert 2. Through the dual locking mechanism of the fixing insert 2 and the universal self-locking screw 3, the self-stabilizing performance of the designed fusion device is ensured.

[0106] Step 5: If there is no need to adjust the length, then complete Steps 3 - Step 4 in sequence.

[0107] Compared with the prior art, the intervertebral fusion device of this embodiment is innovatively designed with an adjustable length structure based on the actual clinical surgical needs and the goal of achieving safe and convenient product implantation. It can be applied not only to a specific segment such as the cervical or lumbar spine, but also effectively solves the problem of the inability to flexibly select the appropriate length during surgery due to the single model of traditional fusion devices. It avoids the need for the patient to change the surgical position during surgery and the removal of improper implants during surgery, improves the fusion rate, and effectively reduces postoperative subsidence. In addition, it adopts an interlocking locking method of fixed inserts and screws, and rationally utilizes the fusion device holding hole to be designed as an integrated self-stabilizing (zero-notch) intervertebral fusion device. The fixed insert can be embedded in the endplate and locked with the universal self-locking screw to effectively prevent retreat. This not only effectively solves the risk of postoperative screw or insert dislocation or displacement, but also overcomes the defects of existing fusion devices with insert designs that all have two wings for anti-retrieval, which makes them difficult to insert and easy to break or bend. From multiple angles, it solves the problems of single fusion devices and high risk of postoperative insert or screw dislocation in intervertebral fusion devices, and has better stability.

[0108] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of this application. It should be understood that the above description is only the specific implementation methods of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. An intervertebral fusion cage, characterized in that: The fusion device comprises a fusion device body (1), wherein the fusion device body (1) comprises a bone graft body (11), an instrument body (16) and a connection assembly, wherein the bone graft body (11) is connected to the instrument body (16) via the connection assembly, and the bone graft body (11) and the instrument body (16) are arranged along the length direction of the fusion device body (1); The length of the fusion device body (1) is adjusted by the connecting assembly; The side wall end surface of the bone graft body (11) is provided with a first connecting hole, and the side wall end surface of the instrument body (16) is provided with a second connecting hole, the center lines of the first connecting hole and the second connecting hole coincide with each other, and the second connecting hole passes through along the length direction of the instrument body (16), the number of the first connecting hole and the second connecting hole are both two, and the number of the connecting components is two; The connecting assembly is inserted into the first connecting hole and the second connecting hole to connect the bone graft body (11) and the instrument body (16); The connecting assembly comprises a driving rod (12), the driving rod (12) comprises a rod body and an operating portion (14), and the rod body is a threaded rod; The first connecting hole is a threaded hole, and the second connecting hole is a stepped hole. The stepped hole has a first aperture and a second aperture in a direction from the instrument body (16) to the bone graft body (11). The diameter of the threaded rod is less than or equal to the second aperture. The diameter of the operating portion (14) is greater than the second aperture and less than or equal to the first aperture. The intervertebral fusion device also includes a locking piece, which includes a fixing insert (2) and a universal self-locking screw (3). The tail end of the fixing insert (2) is provided with a screw hole, and the screw hole is for the universal self-locking screw (3) to pass through and be driven into the vertebra. The side wall end face of the fusion device body (1) is provided with a locking piece installation opening. The second connecting hole is located on the side wall end face provided with the locking piece installation opening. The upper surface and the lower surface of the fusion device body (1) are respectively provided with a screw insertion channel and a fixing insert (2) insertion channel. The screw insertion channel and the fixing insert (2) insertion channel are both connected to the locking piece installation opening. The fixing insert (2) and the universal self-locking screw (3) pass through the locking piece installation opening and through the locking piece channel and are implanted into the vertebra at a reverse angle. A holder operating hole for clamping the fusion device is provided on the side wall of the fusion device body (1), and the holder operating hole includes a first operating hole and a second operating hole, and the first operating hole and the second operating hole are located on both sides of the locking member installation opening; the first holder operating hole and the second holder operating hole on the fusion device body (1) correspond to the two second connection holes provided on the side wall end face of the instrument body (16).

2. The intervertebral fusion cage according to claim 1, characterized in that: The connection assembly includes a track rod (13), the track rod (13) having a first end and a second end, the first end being fixed in the first connection hole, the second end being fixed in the second connection hole, and being able to move in the second connection hole along the length direction of the fusion device body (1).

3. The intervertebral fusion cage according to claim 2, characterized in that: A clamping groove is provided on the hole wall of the first connecting hole, and a slideway is provided on the hole wall of the second connecting hole; The first end is provided with a first boss, and the first boss is clamped in the clamping slot; The second end is provided with a second boss, and the second boss is slidably installed in the slideway.

4. The intervertebral fusion cage according to claim 3, characterized in that: The track rod (13) is an H-shaped structure and is made of titanium alloy metal material.

5. The intervertebral fusion cage according to claim 3, characterized in that: Blocking parts are provided at both ends of the slideway, and the blocking parts are used to limit the sliding range of the second boss.

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