An interlocking nail plate self-stabilizing intervertebral fusion device

Abstract

This patent relates to an interlocking nail plate self-stabilizing intervertebral fusion device, comprising: a fusion device body, a locking member mounting port is provided on the side wall end surface of the fusion device body, and locking member channels communicating with the locking member mounting port are provided on both the upper surface and the lower surface of the fusion device body; a locking member, installed in the locking member mounting port, the locking member includes a fixed insert and a universal self-locking screw, a screw hole is provided at the tail end of the fixed insert, the universal self-locking screw passes through the screw hole, and the fixed insert and the universal self-locking screw are inserted into the locking member mounting port and pass through the locking member channel and are implanted into the vertebra at a reverse angle. The present invention adopts a double locking mechanism of a fixed insert and a universal self-locking screw, the self-stabilizing performance of the fusion device is better, and the length of the fusion device can be adjusted, effectively avoiding the replacement of the patient's surgical position during the operation and the removal of the implant due to improper selection during the operation, improving the fusion rate, and effectively reducing postoperative subsidence.

Description

Technical Field

[0001] This patent belongs to the technical field of medical devices, and relates to an intervertebral fusion cage, specifically to an interlocking nail plate self-stabilizing intervertebral fusion cage. Background Art

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

[0003] Ordinary intervertebral fusion cages are only composed of a main body. After being implanted into the intervertebral space, internal fixation (nail rod) needs to be applied to maintain its stability. In the series of cervical fusion cages, there are already self-stabilizing cervical fusion cages or zero-profile cervical fusion cages, but their models are single. During the operation, due to the different sizes of patients' spines, the single-type fusion cage cannot match the patient's intervertebral disc well, resulting in poor fusion between the upper and lower vertebral bodies, and thus causing slippage of the upper and lower vertebral bodies. There are few self-stabilizing or zero-profile fusion cages in lumbar fusion cages. For conventional lateral lumbar interbody fusion cages, after being implanted into the human body, usually nail rod internal fixation or nail plate internal fixation needs to be added laterally, or the patient's surgical position needs to be changed to add nail rod internal fixation posteriorly. This not only increases the operation time and the incidence of complications, but also aggravates the patient's pain and cost.

[0004] The above-mentioned fusion cages do not need to use an anterior cervical plate for internal fixation, and adopt a self-locking nail or an insert-type integrated fixed fusion cage to achieve self-stability; while in lumbar interbody fusion cages, this design structure is less applied. Using two inserts or screws can provide immediate stability for the surgical segment and effectively avoid serious impacts of internal fixation on the spine and adjacent tissues. However, it is difficult to adjust the position of the insert or the main body of the fusion cage during the operation, and it is difficult to meet the complex situations during the operation. Moreover, since the inserts or screws used to fix the upper and lower vertebral bodies are independent of each other, the risk of insert prolapse and screw withdrawal after surgery is relatively high. In particular, the lateral lumbar interbody fusion cage is generally implanted at the outer edge (epiphyseal ring) of the vertebral body, and the design of its length dimension is particularly important, and there is currently no intervertebral fusion cage with adjustable length. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide an interlocking nail plate self-stabilizing intervertebral fusion cage to solve one or more of the problems that the existing intervertebral fusion cages use a single type of locking member such as an insert or a screw to fix the upper and lower vertebral bodies, and the locking members are independent of each other, resulting in a high risk of locking member prolapse after surgery and the length of the fusion cage cannot be adjusted.

[0006] The object of the present invention is achieved as follows:

[0007] An interlocking nail plate self-stabilizing intervertebral fusion device, comprising:

[0008] A fusion device body, a locking member mounting port is provided on the side wall end surface of the fusion device body, and locking member channels communicating with the locking member mounting port are provided on both the upper surface and the lower surface of the fusion device body;

[0009] A locking member, installed in the locking member mounting port, the locking member includes a fixed insert and a universal self-locking screw, a screw hole is provided at the tail end of the fixed insert, the universal self-locking screw passes through the screw hole, and the fixed insert and the universal self-locking screw are loaded into the locking member mounting port and pass through the locking member channel and are implanted into the vertebra at a reverse angle.

[0010] 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.

[0011] In a preferred embodiment of the present invention, an embedding groove is provided on the hole wall of the screw hole of the fixed insert, and an elastic structure is provided on the outer peripheral wall of the head of the universal self-locking screw, and the elastic structure can be stuck into the embedding groove.

[0012] 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.

[0013] In a preferred embodiment of the present invention, convex teeth are provided on the first surface.

[0014] In a preferred embodiment of the present invention, the convex teeth are inclined towards the tail end of the fixed insert.

[0015] In a preferred embodiment of the present invention, the outer surface of the convex teeth is a convex arc surface.

[0016] In a preferred embodiment of the present invention, the number of the convex teeth is multiple and arranged in multiple rows.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] In a preferred embodiment of the present invention, the fusion device body includes a bone graft body, an instrument body, and a connection assembly. The bone graft body is connected to the instrument body through the connection assembly, 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 assembly.

[0021] 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, and a second connection hole is provided on the side wall end face of the instrument body. The center lines of the first connection hole and the second connection hole coincide; the connection assembly is inserted into the first connection hole and the second connection hole to connect the bone graft body and the instrument body.

[0022] 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 opening.

[0023] 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 the connection assemblies is two.

[0024] In a preferred embodiment of the present invention, the connection assembly includes a driving rod. The driving rod includes a rod body and an operating portion. The rod body is a threaded rod; the first connection hole is a threaded hole, and the second connection hole is a stepped hole. The stepped hole has a first aperture and a second aperture from the instrument body to the bone graft body direction. The diameter of the threaded rod is less than or equal to the second aperture, and the diameter of the operating portion is greater than the second aperture and less than or equal to the first aperture.

[0025] In a preferred embodiment of the present invention, the connection assembly 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, and 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.

[0026] In a preferred embodiment of the present invention, a clamping groove is provided on the hole wall of the first connection hole, and a sliding groove 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 clamping groove; a second boss is provided at the second end, and the second boss is slidably installed in the sliding groove.

[0027] In a preferred embodiment of the present invention, the track rod is of H-shaped structure and is made of titanium alloy metal material.

[0028] In a preferred embodiment of the present invention, blocking portions are provided at both ends of the sliding groove, and the blocking portions are used to limit the sliding range of the second boss.

[0029] In a preferred embodiment of the present invention, the locking member includes two universal self-locking screws.

[0030] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0031] a) The interlocking nail-piece self-stabilizing intervertebral fusion device provided by the present invention adopts a combination of inserts and screws. The fixed inserts and the universal self-locking screws are mutually locked. The fixed inserts can be embedded in the end plate and locked with the universal self-locking screws to form an effective anti-retraction. It can not only effectively solve the risk of postoperative screw or insert dislocation or displacement, but also overcome the defects of the existing fusion devices designed with inserts, which are all two-wing anti-retraction, which are difficult to insert and the two wings are easy to break or bend. In addition, the doctor can not only adjust the screw angle according to the actual needs during the operation and select the appropriate screw insertion angle, but also effectively solve the problem of difficulty in adjusting the position of the insert or fusion device body during the operation to meet the complex situation during the operation.

[0032] b) The interlocking nail piece self-stabilizing intervertebral fusion device provided by the present invention has a convex tooth design on the upper surface of the fixing insert. 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, thereby playing a role in fixing and preventing retreat.

[0033] c) The interlocking nail piece self-stabilizing intervertebral fusion device provided by the present invention has an embedding groove arranged on the hole wall of the screw hole of the fixed insert, and an integrated elastic structure is arranged 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 in the embedding groove of the head of the fixed insert, completing the self-locking of the universal self-locking screw, and at the same time, the locking of the universal self-locking screw is also used to complete the secondary locking of the fixed insert. The self-stabilizing performance of the fusion device of this design is guaranteed by the dual locking mechanism of the fixed insert and the universal self-locking screw, and because the embedding groove is arranged on the hole wall of the screw hole, it cooperates with the elastic structure of the screw head, so that there is a micro-motion design in position between the universal self-locking screw and its embedding groove, which can achieve the effect of dynamic pressurization, so that the bone graft can obtain sufficient load stimulation, thereby improving the fusion rate.

[0034] d) The interlocking nail-piece self-stabilizing intervertebral fusion device provided by the present invention innovatively sets the fusion device body as a length-adjustable structure, and can be used not only in a specific segment such as the cervical spine or lumbar spine, but also can effectively solve the problem that the traditional fusion device has a single model and the appropriate length cannot be flexibly selected during surgery, thereby avoiding the need for the patient to change the surgical position during surgery and the removal of improper implants during surgery, thereby improving the fusion rate and effectively reducing postoperative subsidence. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the embodiments of this specification. For those of ordinary skill in the art, other accompanying drawings can also be obtained based on these drawings.

[0036] Figure 1 Structural schematic of the interlocking nail plate self-stabilizing intervertebral fusion device of the present invention Figure 1 ;

[0037] Figure 2 Structural schematic of the interlocking nail plate self-stabilizing intervertebral fusion device of the present invention Figure 2 ;

[0038] Figure 3 Structural schematic of the interlocking nail plate self-stabilizing intervertebral fusion device of the present invention Figure 3 ;

[0039] Figure 4 Structural schematic diagram of the disassembled interlocking nail plate self-stabilizing intervertebral fusion device of the present invention;

[0040] Figure 5 Structural schematic of the fusion device body of the present invention Figure 1 ;

[0041] Figure 6 Structural schematic diagram of the bone graft body of the fusion device body of the present invention;

[0042] Figure 7 End side view of the instrument body of the fusion device body of the present invention;

[0043] Figure 8 Cross-sectional structural schematic of the fusion device body of the present invention Figure 1 ;

[0044] Figure 9 Cross-sectional structural schematic of the fusion device body of the present invention Figure 2 ;

[0045] Figure 10 Structural schematic diagram of the track rod assembly of the present invention;

[0046] Figure 11 Structural schematic of the fixed insert of the present invention Figure 1 ;

[0047] Figure 12 Structural schematic of the fixed insert of the present invention Figure 2 ;

[0048] Figure 13 Structural schematic diagram of the universal self-locking screw of the present invention;

[0049] Figure 14 Structural schematic of the interlocking nail plate self-stabilizing intervertebral fusion device of the present invention Figure 4 ;

[0050] Figure 15 Internal structural schematic diagram of the interlocking nail plate self-stabilizing intervertebral fusion device of the present invention;

[0051] Figure 16 Interlocking schematic of the universal self-locking screw and the insert of the present invention;

[0052] Reference numerals:

[0053] 1 - Fusion device body; 11 - Bone grafting body; 12 - Driving 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

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0055] To facilitate the understanding of the embodiments of the present 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 the present application.

[0056] Embodiment 1

[0057] 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 grafting body 11, an instrument body 16 and a connection assembly. The bone grafting body 11 is connected to the instrument body 16 through the connection assembly, and the bone grafting body 11 and the instrument body 16 are arranged along the length direction of the fusion device body 1.

[0058] By adjusting the connection assembly to control the distance between the bone grafting body 11 and the instrument body 16, the length adjustment of the fusion device body 1 can be conveniently and quickly realized, 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.

[0059] In this embodiment, the intervertebral fusion device further includes a locking member. A locking member mounting opening is provided on the side wall end face of the fusion device body 1. The locking member mounting opening 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 mounting opening 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 mounting opening.

[0060] Specifically, the locking member is a universal self-locking screw 3. The number of the universal self-locking screws 3 is two. The two universal self-locking screws 3 are implanted into the vertebra at a reverse angle through the locking member mounting opening.

[0061] In a preferred embodiment of this embodiment, a first connection hole and a second connection hole are respectively provided on the side wall end face of the bone graft body 11 and the side wall end face of 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 mounting opening. Among them, the first connection hole is a blind hole, and the second connection hole is a through hole. The second connection hole runs through along the length direction of the instrument body 16.

[0062] Among them, the connection assembly is an overall rod-shaped structure. The connection assembly can be inserted into the first connection hole and the second connection hole. The connection assembly passes through the second connection hole and penetrates into the first connection hole to connect the bone graft body 11 and the instrument body 16. The distance between the bone graft body 11 and the instrument body 16 is controlled by adjusting the connection assembly, so as to realize the length adjustment of the fusion device body 1.

[0063] In a preferred embodiment of this embodiment, the number of both the first connection hole and the second connection hole is two. That is to say, the fusion device body 1 is provided with two groups of connection holes. Correspondingly, two connection assemblies are used to connect the bone graft body 11 and the instrument body 16. One connection assembly is installed in each group of connection holes. Each group of connection holes includes a first connection hole and a second connection hole with coincident center lines. And the two second connection holes are located on both sides of the locking member mounting 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 body 1.

[0064] Since the side wall of the conventional fusion device body 1 is provided with a gripper operation hole for gripping the fusion device, the gripper 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 mounting port. Therefore, in a preferred embodiment of the present embodiment, the first gripper operation hole and the second gripper operation hole on the fusion device body 1 correspond to two second connection holes provided on the side wall end surface of the instrument body 16. That is to say, the connection component of the present application makes full use of the gripper operation hole on the fusion device body 1, and the structure of the operation hole can be adaptively improved according to the structure of the connection component. The fusion device length adjustment hole position is set as the gripper operation hole. At the same time, the fusion device length adjustment hole position is also a structure that cooperates with the gripper. 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.

[0065] In this embodiment, the connection mode of the connection component with the first connection hole and the second connection hole can adopt a plug-in connection, a threaded connection, or a connection mode combining plug-in and threaded connections. The connection component includes a drive rod 12 and / or a track rod 13. The connection component is built into the fusion device body 1. The bone grafting body 11 and the instrument body 16 of the fusion device body 1 can be connected by two drive rods 12, or can be connected by two track rods 13, or can also adopt a connection mode combining one drive rod 12 and one track rod 13.

[0066] In the first connection mode, the bone grafting body 11 and the instrument body 16 of the fusion device body 1 are connected by a threaded 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. 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. The stepped hole has a first hole diameter and a second hole diameter from the instrument body 16 to the bone grafting body 11 direction. The diameter of the rod body of the drive rod 12 is less than or equal to the second hole diameter. 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-placed in the fusion device body 1 to connect the bone grafting body 11 and the instrument body 16. The front end of the drive rod 12 is located in the bone grafting 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.

[0067] When the length of the fusion device body 1 needs to be increased, the two driving rods 12 are screwed at the same time, and the driving rods 12 are screwed out within a certain thread length in the bone graft body 11. The two driving rods 12 are screwed out to the same length to adjust the distance required to increase the fusion device body 1. In this process, the distance between the bone graft body 11 and the instrument body 16 changes, and the length of the fusion device body 1 is adjusted. The length of the fusion device body is adjusted by simultaneously advancing and withdrawing the two driving rods 12. The length of the fusion device body 1 can be increased according to the actual needs of the fusion device body 1, and the driving rods 12 are screwed a corresponding number of times to achieve precise control and adjustment of the length of the fusion device body 1.

[0068] It should be noted that when the bone graft body 11 and the instrument body 16 are connected by two drive rods 12, the operating part 14 cooperates with the screwing tool to complete the rotation of the two drive rods 12. Note that the two drive rods 12 are screwed the same number of times to ensure that the two drive rods 12 have the same advance and retreat distance.

[0069] 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 drive rod 12 is connected through 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 drive rod 12 is pressurized by a surgical instrument and then rotated forward or backward, so that 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, both of which are 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 are driving rod mounting holes, and the second group of connecting holes are 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 by the threads 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 of a driving rod 12 to quickly and conveniently adjust the relative distance between the bone graft body 11 and the instrument body 16, thereby realizing the 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 the length can also be adjusted. This hole setting kills two birds with one stone.

[0070] When it is necessary to increase the length of the fusion device body 1, turn the driving rod 12. The position of the operating part 14 remains unchanged, and the bone grafting body 11 moves forward. The distance between the bone grafting body 11 and the instrument body 16 increases. When the bone grafting body 11 moves forward to the required position, the overall length of the fusion device body 1 is the required length. If it is found during the operation that the length adjustment of the fusion device body 1 is too long and needs to be adjusted shorter, use the reverse rotation of the instrument driving rod 12. The distance between the instrument body 16 and the bone grafting body 11 becomes smaller until the fusion device body 1 reaches the required length.

[0071] In the second connection method, the maximum adjustable range of the length of the fusion device body 1 is related to the structures of the driving rod 12 and the track rod 13. The design of the adjustable length of this fusion device is as Figures 4 - 9 shown.

[0072] There can be various structures of the track rod 13, as long as it can cooperate with the driving rod 12 to restrict the relative rotation of the bone grafting body 11 and the instrument body 16, and can guide the bone grafting body 11 and the instrument body 16 to move relatively freely along the length direction of the fusion device.

[0073] A preferred structure of the track rod 13 is as Figure 10 shown. The track rod 13 is of an H-shaped structure and is made of titanium alloy metal material. The two ends of the H-shaped track rod 13 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 grafting 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.

[0074] Furthermore, a clamping groove is provided on the hole wall of the first connection hole, and a sliding groove is provided on the hole 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 grafting body 11, and insert the second end of the track rod 13 into the second connection hole of the instrument body 16. After insertion, the two 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. And 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 disengaging from the second connection hole, ensuring that the bone grafting body 11 and the instrument body 16 always remain connected and avoiding disengagement during the operation, ensuring the working reliability of the fusion device. In addition, this structural setting can also limit the length adjustment range of the bone grafting body 11 and the instrument body 16.

[0075] Another preferred structure of the track rod 13. 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 placed inside the body 1. The track rod 13 and the bone graft body 11 are integrally processed. The first end of the track rod 13 has been fixed inside the bone graft body 11, and the second end is provided with an opening, being a semi-H-shaped structure. And a slide rail is provided inside 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, so as to complete the length adjustment of the fusion device body 1.

[0076] In a preferred embodiment of this example, both the fusion device body 1 and the track rod 13 are made of PEEK material.

[0077] Compared with the prior art, the intervertebral fusion device of this example has at least the following beneficial effects:

[0078] 1. When using the fusion device of this example, 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 model of the traditional fusion device, it is impossible to flexibly select an appropriate length during the operation.

[0079] 2. The length adjustment hole position of the fusion device is set as the holding and extracting device hole. This structure can not only adjust the length, but also be a structure for cooperating with the holding and extracting device, which can reduce the complexity of the operation.

[0080] Embodiment 2

[0081] Another specific embodiment of the present invention discloses an interlocking nail plate self-stabilizing intervertebral fusion device, which is different from the intervertebral fusion device in Embodiment 1 in that: the locking member includes a fixed insert plate 2 and a universal self-locking screw 3.

[0082] As Figures 1 - 4 、 Figures 14 - 16 shown, the interlocking nail plate self-stabilizing intervertebral fusion device includes a fusion device body 1 and a locking member; wherein, the locking member includes a fixed insert plate 2 and a universal self-locking screw 3. A screw hole is provided at the tail end of the fixed insert plate 2, and the universal self-locking screw 3 passes through the screw hole and is driven into the vertebra; a locking member installation port is provided on the side wall end face of the fusion device body 1, and a screw penetration channel and a fixed insert plate penetration channel 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 plate penetration channel are both communicated with the locking member installation port. The fixed insert plate 2 and two universal self-locking screws 3 are implanted into the vertebra at a reverse angle through the locking member installation port through the locking member channel.

[0083] The self-stable design of the fusion device is achieved by locking the fixed insert 2 and the universal self-locking screw 3 with each other. That is, while the universal self-locking screw 3 locks the fusion device, it can also re-lock the insert. The fixed insert 2 and the universal self-locking screw 3 form an interactive locking structure to achieve the self-stability 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.

[0084] In a preferred embodiment 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. 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.

[0085] In a preferred embodiment 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. The self-locking structure formed by the two universal self-locking screws and the fixed insert 2 has better stability.

[0086] 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 tail end is a bent structure. A screw hole is provided at the limiting end for the universal self-locking screw 3 to pass through and drive into the upper vertebral body. At the same time, a limiting rod is also provided on the side end surface of the limiting end. The size of the limiting rod is larger than the size of the installation opening on the outer end surface of the instrument body 16, so that the limiting end of the fixed insert 2 is stuck in the installation opening to play a limiting role.

[0087] In a preferred embodiment of this embodiment, the first surface of the fixed insert 2 is a convex surface, and convex teeth 21 are provided on the convex surface. The convex teeth 21 can be stuck into the vertebra to prevent the fixed insert 2 from falling off and play a role in fixing and preventing retraction; the second surface of the fixed insert 2 is a concave surface, and the concave surface is a smooth surface.

[0088] Furthermore, the convex teeth 21 are inclined towards the tail end of the fixed insert 2. The convex teeth 21 are triangular protrusions. The tooth tail of the convex teeth 21 is fixedly connected to the first surface of the fixed insert 2, and the tooth end of the convex teeth 21 is inclined towards the tail end of the fixed insert 2. Preferably, the outer surface of the convex teeth 21 is a convex surface. That is to say, when the fixed insert 2 is inserted into the vertebra, the contact surface between the convex teeth 21 and the vertebra is a convex surface. This structural setting can make the insert smoothly inserted into the vertebra in an arc shape and reduce the discomfort of the patient.

[0089] In a preferred embodiment of this example, multiple rows of convex teeth are provided on the first surface of the fixed insert 2, and a plurality of convex teeth 21 are evenly arranged in each row; from the insertion end to the tail end of the fixed insert 2, the row spacing of the multiple rows of convex teeth gradually decreases. By setting multiple rows of convex teeth with gradually decreasing row spacing, not only can the fixed insert 2 be smoothly inserted into the vertebra, but the area where the convex teeth are embedded in the vertebral body is relatively concentrated, making the stability better after the insert is driven into the lower vertebra, improving the anti-retreat effect of the fixed insert 2, and also minimizing the discomfort of the patient to the greatest extent.

[0090] In a preferred embodiment of this example, the insertion end of the fixed insert 2 is a wedge-shaped structure, with the front end of the wedge-shaped structure being narrow and the rear end being wide, and a V-shaped opening is provided at the central part of the wedge-shaped structure, that is, a V-shaped notch is provided at the first end of the fixed insert 2. When the fixed 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 in, and the anti-withdrawal performance is better after driving in.

[0091] In a preferred embodiment of this example, an embedding groove 22 is provided on the hole wall of the screw hole of the fixed insert 2, and an elastic structure 31 is provided on the outer peripheral wall of the head of the universal self-locking screw 3. 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 passes through the screw hole on the fixed insert 2 and is driven into the appropriate position in the vertebra, the elastic structure 31 at the head of the screw is embedded into the embedding groove 22 of the fixed insert 2 to complete the self-locking of the universal self-locking screw 3, and at the same time, the secondary locking of the fixed insert 2 is also completed by using the locking of the universal self-locking screw 3. Through the dual locking mechanism of the fixed insert 2 and the universal self-locking screw 3, the self-stable performance of this designed fusion device is ensured. Due to the embedding groove 22 provided on the hole wall of the screw hole and the cooperation with the elastic structure 31 at the head of the screw, there is a micro-motion design in the position between the universal self-locking screw 3 and its embedding groove 22, which can achieve the effect of dynamic compression, enabling the bone graft block to receive sufficient load stimulation, thereby improving the fusion rate.

[0092] The usage method is as follows: After the fusion device in the initial state is placed at the appropriate intervertebral position of the patient, the length of the fusion device is adjusted to the appropriate position. First, the fixed insert 2 is driven into the lower vertebra to preliminarily fix the fusion device, and then 2 universal self-locking screws 3 are sequentially driven into the upper vertebra through the upper screw holes of the fixed insert 2. There is no order for driving in the 2 universal self-locking screws 3, and the locking is completed. When the universal self-locking screw 3 reaches the appropriate position, the elastic structure 31 at the head of the universal self-locking screw 3 is embedded into the embedding groove 22 in the screw hole on the fixed insert 2, completing the locking of the fusion device and at the same time being able to achieve the secondary locking of the insert.

[0093] Compared with the existing fusion device using a single screw or a single insert, the interlocking nail-piece self-stabilizing intervertebral fusion device of this embodiment adopts a structural design of interlocking fixed inserts and universal self-locking screws, which has significant advantages, specifically embodied in:

[0094] 1. The combination of inserts and screws is adopted. The fixed inserts and the universal self-locking screws are locked with each other. The fixed inserts can be embedded in the end plate and locked with the universal self-locking screws to effectively prevent retreat. This can not only effectively solve the risk of postoperative screw or insert dislocation or displacement, but also overcome the defects of the existing fusion devices with insert designs, which are all anti-retreat on both wings, which are difficult to insert and the two wings are easy to break or bend.

[0095] 2. By using the interlocking nail-piece self-stabilizing intervertebral 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 situations.

[0096] 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, thus playing a role in fixing and preventing retreat.

[0097] 4. By setting an embedding groove on the wall of the screw hole of the fixed insert and setting an integrated 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 in the embedding groove of the head of the fixed insert to complete the self-locking of the universal self-locking screw, and at the same time, the locking of the universal self-locking screw is also used to complete the secondary locking of the fixed insert. The self-stabilizing performance of the fusion device of this design is guaranteed by the dual locking mechanism of the fixed insert and the universal self-locking screw, and because the embedding groove is set on the wall of the screw hole, it cooperates with the elastic structure of the screw head, so that the universal self-locking screw and its embedding groove have a positional micro-motion design, which can achieve the effect of dynamic pressure, so that the bone graft can be fully loaded and stimulated, thereby improving the fusion rate.

[0098] Example 3

[0099] Another specific embodiment of the present invention is as follows Figures 1 - 4 , Figures 14 - 15As shown, an intervertebral fusion device is disclosed, which includes the fusion device body 1 of Embodiment 1 and the locking member of Embodiment 2. Specifically, the locking member includes a fixed insert 2 and a universal self-locking screw 3. More specifically, the fusion device body 1 includes a bone grafting body 11, an instrument body 16, and a connecting component. The bone grafting body 11 is connected to the instrument body 16 through the connecting component, and the bone grafting 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. The tail end of the fixed insert 2 is provided with a screw hole, and the universal self-locking screw 3 passes through the screw hole and is driven into the vertebra.

[0100] In this embodiment, a locking member installation port is provided on the side wall end face of the fusion device body 1. 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. Both the screw penetration channel and the fixed insert penetration channel communicate with the locking member installation port. 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.

[0101] 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.

[0102] In a preferred embodiment of this embodiment, the bone grafting body 11 and the instrument body 16 of the fusion device body 1 are connected by a combination of plug connection and threaded connection. Specifically, the connecting 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 setting only needs to control the rotation and advancement of one driving rod 12 to conveniently and quickly adjust the relative distance between the bone grafting body 11 and the instrument body 16, and thus achieve rapid and precise adjustment of the length of the fusion device body 1.

[0103] The operation steps of using the intervertebral fusion device of this embodiment are as follows:

[0104] 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 the original shortest length.

[0105] Step 2: Judge 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.

[0106] 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 the corresponding surgical instrument to screw the built-in driving rod 12 so that the operating part 14 of the driving rod 12 fits and pressurizes the connecting end face 15 of the bone graft body 11, and controls the driving rod 12 to rotate forward and reverse within a certain thread length. The driving rod 12 changes the position of the adjustment rod 13 by changing the thread position, thereby realizing the increase and shortening of the length of the fusion device body 1 within a certain range until the length of the fusion device is adjusted to an appropriate position.

[0107] Step 3: After adjusting the fusion device body 1 to an appropriate length, use the fixing insert 2 to be driven through the locking piece installation opening of the fusion device body 1 to complete the initial stabilization of the fusion device.

[0108] Step 4: Drive two universal self-locking screws 3 through the screw holes at the tail of the fixed insert 2 in sequence. When the screw position is 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 fixed insert 2 to complete the self-locking of the universal self-locking screw 3. At the same time, the locking of the universal self-locking screw 3 is also used to complete the secondary locking of the fixed insert 2. The dual locking mechanism of the fixed insert 2 and the universal self-locking screw 3 ensures the self-stabilizing performance of the fusion device of this design.

[0109] Step 5: If no length adjustment is required, complete steps 3 and 4 in sequence.

[0110] Compared with the prior art, the intervertebral fusion device of this embodiment is innovatively designed to have an adjustable length structure from the perspective of actual clinical surgical needs and the realization of safe and convenient product implantation. It can be applied not only to a specific segment such as the cervical spine or lumbar spine, but also can effectively solve the problem that the appropriate length cannot be flexibly selected during surgery due to the single model of traditional fusion devices, avoids the patient's change of surgical position during surgery and the removal of improper implants during surgery, improves the fusion rate, and effectively reduces postoperative subsidence; and, by adopting a fixed insert and a screw interlocking locking method, and rationally utilizing the fusion device holding hole, the intervertebral fusion device is designed as an integrated self-stabilizing (zero notch) intervertebral fusion device, the fixed insert can be embedded in the end plate, and locked with the universal self-locking screw to form an effective anti-retraction, which can not only effectively solve the risk of postoperative screw or insert dislocation or displacement, but also overcome the defects of the existing fusion devices with insert design that all have two wings to prevent retreat, resulting in difficulty in insertion and easy breakage or bending of the two wings, and solves the problems of a single fusion device and a high risk of postoperative insert or screw dislocation in the intervertebral fusion device from multiple angles, and has better stability.

[0111] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present application. It should be understood that the above description is only the specific embodiments of the present application and is not used to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. An interlocking nail plate self-stabilizing intervertebral fusion device, characterized in that, Comprising: A fusion device body (1), a locking member mounting opening is provided on the side wall end surface of the fusion device body (1), and locking member channels communicating with the locking member mounting opening are provided on both the upper surface and the lower surface of the fusion device body (1); A locking member, installed in the locking member mounting opening, the locking member includes a fixed insert piece (2) and a universal self-locking screw (3), a screw hole is provided at the tail end of the fixed insert piece (2), the universal self-locking screw (3) passes through the screw hole, and the fixed insert piece (2) and the universal self-locking screw (3) are inserted into the locking member mounting opening and pass through the locking member channel and are implanted into the vertebra at a reverse angle; Wherein, the fusion device body (1) includes a bone grafting body (11), an instrument body (16) and a connecting component, the bone grafting body (11) is connected to the instrument body (16) through the connecting component, and the bone grafting 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 is adjusted through the connecting component; An embedding groove (22) is provided on the hole wall of the screw hole of the fixed insert piece (2), and an elastic structure (31) is provided on the outer peripheral wall of the head of the universal self-locking screw (3), and the elastic structure (31) can be clamped into the embedding groove (22).

2. The interlocking nail plate self-stabilizing intervertebral fusion device according to claim 1, wherein The number of the fixed insert pieces (2) is one, and the number of the universal self-locking screws (3) is two; Two screw holes are provided at the tail end of the fixed insert piece (2).

3. The interlocking nail plate self-stabilizing intervertebral fusion device according to claim 1, characterized in that, The fixed insert piece (2) has a first surface and a second surface, the first surface is a convex surface, and the second surface is a concave surface.

4. The interlocking nail plate self-stabilizing intervertebral fusion device according to claim 3, characterized in that, Convex teeth (21) are provided on the first surface.

5. The interlocking nail plate self-stabilizing intervertebral fusion device according to claim 4, characterized in that The convex teeth (21) are inclined towards the tail end of the fixed insert piece (2).

6. The interlocking nail plate self-stabilizing intervertebral fusion device according to claim 5, characterized in that The outer surface of the convex teeth (21) is a convex arc surface.

7. The interlocking nail plate self-stabilizing intervertebral fusion device according to any one of claims 4-6, characterized in that, The number of the convex teeth (21) is multiple and arranged in multiple rows.

8. The interlocking nail plate self-stabilizing intervertebral fusion device according to claim 7, characterized in that, From the insertion end to the tail end of the fixed insert piece (2), the row spacing of the multiple rows of convex teeth gradually becomes smaller.

9. The interlocking nail plate self-stabilizing intervertebral fusion device according to any one of claims 1-6 or 8, characterized in that, The insertion end of the fixed insert piece (2) is a wedge-shaped structure, and a V-shaped opening is provided at the central part of the wedge-shaped structure.

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