Spine intervertebral fusion implant positioning structure

Abstract

The invention discloses a spine intervertebral fusion implant positioning structure, which relates to the technical field of intervertebral fusion cage, and comprises a fusion cage upper moving part and a fusion cage lower moving part, which are mutually clamped, bone grafting holes for implanting bone blocks are formed in the fusion cage upper movable part and the fusion cage lower movable part in a penetrating manner; through the arrangement of the fusion cage upper moving part, the fusion cage lower moving part and the expandable connecting rods, stable support is formed between adjacent vertebral bodies, the correct height between the vertebral bodies is maintained, meanwhile, through the arrangement of the connecting rods, the connecting rods and the push rods, the situation that the interbody fusion cage is deformed in the process of bearing pressure between the adjacent vertebral bodies in the use process is avoided, and the use safety of the interbody fusion cage is improved. And through the arrangement of the helical tooth blocks and the clamping blocks, the fusion cage is prevented from being deformed due to the fact that the adjacent intervertebral pressure is too large in the using process.

Description

Technical Field

[0001] The present invention relates to the technical field of intervertebral fusion devices, and in particular to a spinal intervertebral fusion implant positioning structure. Background Art

[0002] Spinal intervertebral body fusion implants are specific products used in spinal fusion surgery to connect two or more bones in any part of the spine, preventing movement between the bones and fixing the bones together using metal plates, screws or rods, ultimately fusing the adjacent bones;

[0003] The existing patent number "CN116158892B" is an authorized patent for an adjustable lumbar intervertebral fusion device, comprising an upper portion and a lower portion of the device, wherein teeth are provided on the top surface of the upper portion and the bottom surface of the lower portion of the device, and a vertical through hole for accommodating a filling material is provided in the middle of the device, and the upper portion of the device is hingedly connected to the lower portion of the device, and the hinge portion is located behind the vertical through hole, so as to achieve adjustable opening angle between the upper portion and the lower portion of the device; a support adjustment mechanism is further provided in front of the vertical through hole, and the support adjustment mechanism is used to adjust and fix the opening angle, and the support adjustment mechanism adjusts the distance between the upper portion and the lower portion of the device by rotating the adjustment screw, and can accurately, flexibly and widely adjust the vertebral space height during installation, with an adjustment accuracy of up to 0.2° and an adjustable opening angle range of up to 0-44°, and it is easy not to be interfered with by the support frame during surgery during adjustment;

[0004] However, in actual use, the above-mentioned lumbar intervertebral fusion device realizes unilateral expansion between the upper top surface of the device and the lower bottom surface of the device by rotating the adjusting screw. Although the height of the intervertebral space can be adjusted, there is no positioning mechanism to ensure uniform contact between the upper and lower bottom surfaces of the intervertebral fusion device and the cross-section of the vertebral body. In actual use, after being placed in the patient's body, the intervertebral fusion device needs to maintain close contact with the vertebral body to maintain the height of the vertebral body. In the use of the above-mentioned invention patent and actual products, the intervertebral fusion device does not have a corresponding positioning mechanism to keep the position of the intervertebral fusion device constant. After the intervertebral fusion cage is placed in the patient's body, the patient's own movement causes the position of the intervertebral fusion cage to shift, so the intervertebral fusion cage and the vertebral surface cannot be fully contacted. The uneven contact area with the vertebral body can easily lead to stress concentration during the subsequent postoperative recovery process, causing the intervertebral fusion cage to sink. In addition, the intervertebral fusion cage cannot be in close contact with the cartilage endplates of the adjacent vertebrae, causing some areas to bear excessive pressure while other areas are insufficiently supported. This will cause intervertebral fusion failure, and then lead to a decrease in intervertebral height, vertebral displacement or adjacent segment lesions.

[0005] Therefore, we propose a spinal intervertebral fusion implant positioning structure to solve the above problems. Summary of the Invention

[0006] Technical problems solved

[0007] In view of this, and in view of the deficiencies of the prior art, the present invention provides a spinal intervertebral fusion implant positioning structure to solve the problems raised in the above background technology.

[0008] Technical Solution

[0009] To achieve the above-mentioned object, the present invention provides the following technical solutions: a spinal intervertebral fusion implant positioning structure, comprising an upper movable member of a fusion device and a lower movable member of a fusion device, the upper movable member of the fusion device and the lower movable member of the fusion device being engaged with each other, bone grafting holes for implanting bone blocks being formed through the interiors of the upper movable member of the fusion device and the lower movable member of the fusion device, tooth blocks being provided on the upper top surface of the fusion device and the lower bottom surface of the fusion device, a fitting limit block being symmetrically fixedly connected to the outer surface of one side of the upper movable member of the fusion device, and a positioning support assembly being provided between the upper movable member of the fusion device and the lower movable member of the fusion device;

[0010] The positioning support assembly includes positioning grooves symmetrically opened on both sides of the opposite surfaces of the upper movable part and the lower movable part of the fusion device, an internal threaded sleeve is fitted between the two positioning grooves on the same side, one end of the internal threaded sleeve is connected to a threaded rod through the internal thread, one end of the threaded rod is arranged inside the internal threaded sleeve and is rotatably connected to a push rod, the push rod is slidably connected to a positioning block at one end away from the threaded rod, the upper and lower surfaces of the push rod are equidistantly fixedly connected to bevel gear blocks, the outer surface of the push rod is sleeved with a limiting ring, the inner surface of the limiting ring is fixedly connected to a clamping block, the outer surface of the limiting ring is symmetrically rotatably connected to a connecting rod, and the connecting rod is rotatably connected to the adjacent side.

[0011] Preferably, the interior of the internal threaded sleeve is hollow, and the push rod consists of two thick cylindrical rods and two thin cylindrical rods. The two thick cylindrical rods and two thin cylindrical rods in the push rod are horizontally arranged inside the internal threaded sleeve in the order of thick cylindrical rod, thin cylindrical rod, another thick cylindrical rod and another thin cylindrical rod. One of the thick cylindrical rods is rotatably connected to the threaded rod at one end arranged inside the internal threaded sleeve, and the outer surface of the positioning block is fixedly connected to the inner wall of the internal threaded sleeve.

[0012] Preferably, two groups of bevel gear blocks are provided, both groups of bevel gear blocks are provided on the thick columnar rod, and two groups of limit rings, clamping blocks, connecting rods and connecting rods are provided in the horizontal direction. The outer walls of the two groups of limit rings are fixedly connected to the inner wall of the internal threaded sleeve, and the two groups of clamping blocks are located on the movement trajectory of the limit rings. One side of the clamping block is set as an inclined plane, and the inclined plane is in contact with the bevel gear block.

[0013] Preferably, through grooves are provided on the upper and lower surfaces of the internal threaded sleeve, and spherical grooves are provided on the walls of the positioning grooves. The connecting rod consists of a straight rod and a sphere. The end of the connecting rod away from the limiting ring passes through the through groove and extends to the outside of the internal threaded sleeve. The sphere at the end of the connecting rod extending to the outside of the internal threaded sleeve is rotatably connected to the inside of the spherical groove, and the connecting rod away from the end of the connecting rod is rotatably connected to the outer wall of the push rod.

[0014] Preferably, it further includes a limiting component arranged inside the positioning groove;

[0015] The limiting assembly includes an upper positioning disc arranged inside the positioning groove, the bottom surface of the upper positioning disc is symmetrically fixedly connected with a round rod, the bottom of the upper positioning disc is fitted with a lower positioning disc, the outer surfaces of the upper positioning disc and the lower positioning disc are fixedly connected with a push rod, and the positioning groove wall is symmetrically provided with sliding grooves.

[0016] Preferably, cylindrical grooves are symmetrically provided inside the lower positioning disc, and the upper positioning disc is connected to the lower positioning disc by means of a round rod inserted into the cylindrical groove.

[0017] Preferably, the upper positioning disc and the lower positioning disc are connected to the inside of the slide groove through a damping slider for damped sliding. The upper positioning disc and the lower positioning disc are provided with arc grooves on the surface of the side close to the threaded rod. The arc grooves on the outer surfaces of the upper positioning disc and the lower positioning disc are jointly fitted to the outer wall of the internal threaded sleeve.

[0018] Preferably, it further comprises an auxiliary connection assembly provided between the upper movable part and the lower movable part of the fusion device;

[0019] The auxiliary connection assembly comprises mounting grooves symmetrically arranged at both ends of a side close to the upper movable part and the lower movable part of the fusion device, and an elastic support member is fixedly installed between the mounting grooves at the same ends.

[0020] Preferably, multiple groups of elastic support members are provided along the horizontal tangent direction of the upper movable member and the lower movable member of the fusion device, and each group of elastic support members is composed of multiple thin rods connected to each other in rotation, and the multiple interconnected thin rods together form a network structure.

[0021] Beneficial effects

[0022] Compared with the prior art, the present invention provides a spinal intervertebral fusion implant positioning structure, which has the following beneficial effects:

[0023] The upper and lower movable parts of the fusion cage and the deployable connecting rods enable the upper and lower surfaces of the fusion cage to be in close contact with the adjacent vertebrae. Compared with the uniaxial deployable arrangement of existing intervertebral fusion cages, this intervertebral fusion cage can be deployed on both sides, thereby making the contact surfaces between the intervertebral fusion cage and the adjacent vertebrae fit closely, forming a stable support between the adjacent vertebrae and facilitating the fixation of the position of the intervertebral fusion cage between the adjacent vertebrae, thereby helping to maintain the correct height between the vertebrae and preventing a decrease in vertebral height due to intervertebral disc degeneration or other factors.

[0024] The triangular structure formed by the connecting rods, connecting rods and push rods provides a stable support between the upper and lower movable parts of the fusion cage, thus preventing the intervertebral fusion cage from being deformed by the pressure between adjacent vertebrae during use, and from settling in the intervertebral disc, which could shorten the distance between adjacent vertebrae and cause spinal fusion failure.

[0025] By setting the bevel gear block and the clamping block, when the push rod drives the bevel gear block to move, the multiple bevel gear blocks are convenient for medical staff to accurately adjust the moving distance of the push rod, and then adjust the distance between the upper movable part of the fusion device and the lower movable part of the fusion device through the connecting rod, so as to accurately adjust the support height of the fusion device between adjacent vertebrae. In addition, the clamping block can prevent the reverse movement of the bevel gear block, and thus prevent the reverse movement of the push rod and the threaded rod inside the threaded sleeve. The unchanged position of the push rod ensures that the positions of the connecting rod and the connecting rod will not change, and thus the distance between the upper movable part of the fusion device and the lower movable part of the fusion device supported by the connecting rod is constant, further avoiding deformation of the fusion device due to excessive pressure between adjacent vertebrae during use;

[0026] The upper and lower positioning discs are provided to define the position of the internally threaded sleeve, thereby preventing the internally threaded sleeve from moving during use, which would cause the threaded rod to fail to rotate, thereby ensuring the stable use of the intervertebral fusion cage between adjacent vertebrae.

[0027] Through the stable connection between the elastic support and the upper movable part and the lower movable part of the fusion device, the mesh structure of the elastic support can adapt to the change of the distance between the upper movable part and the lower movable part of the fusion device, and the elastic support can assist in supporting the position where the connecting rod is not set between the upper movable part and the lower movable part of the fusion device, thereby avoiding deformation of the intervertebral fusion device caused by pressure imbalance during use, and further avoiding failure of the fusion device and settlement between adjacent vertebrae. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall appearance of the present invention;

[0029] Figure 2 For the present invention Figure 1 Another perspective structural diagram;

[0030] Figure 3 This is a schematic diagram of the internal structure of the lower movable part of the fusion device of the present invention;

[0031] Figure 4 This is a schematic diagram of the connection relationship of the internal threaded sleeve of the present invention;

[0032] Figure 5 This is a schematic diagram of the internal structure of the upper movable part of the fusion device of the present invention;

[0033] Figure 6 This is a schematic diagram of the connection relationship at the positioning groove of the present invention;

[0034] Figure 7 For the present invention Figure 6 A schematic diagram of the structure at center A;

[0035] Figure 8 This is a schematic diagram of the connection relationship of the threaded rod of the present invention;

[0036] Figure 9 Schematic diagram of the cross-sectional structure of the internal threaded sleeve of the present invention;

[0037] Figure 10 For the present invention Figure 9 Another perspective structural diagram;

[0038] Figure 11 For the present invention Figure 10 A magnified schematic diagram of the structure at point B in the middle.

[0039] In the figure: 11, upper movable part of fusion device; 12, lower movable part of fusion device; 13, fitting limit block; 21, positioning groove; 22, internal thread sleeve; 23, threaded rod; 24, push rod; 2401, positioning block; 25, bevel gear block; 26, limit ring; 27, clamping block; 28, connecting rod; 29, connecting rod;

[0040] 31. Upper positioning disc; 32. Round rod; 33. Lower positioning disc; 34. Damping slider; 35. Slide groove;

[0041] 41. Mounting slot; 42. Elastic support member. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Embodiments of the present invention

[0044] See also Figures 1 to 11 A spinal intervertebral fusion implant positioning structure includes an upper movable member 11 of the fusion device and a lower movable member 12 of the fusion device. The upper movable member 11 of the fusion device and the lower movable member 12 of the fusion device are engaged with each other. Bone grafting holes for implanting bone blocks are opened inside the upper movable member 11 of the fusion device and the lower movable member 12 of the fusion device. Tooth blocks are provided on the upper top surface of the fusion device upper movable member 11 and the lower bottom surface of the fusion device lower movable member 12. A fitting limit block 13 is symmetrically fixedly connected to the outer surface of one side of the upper movable member 11 of the fusion device. The structure also includes a positioning support component arranged between the upper movable member 11 of the fusion device and the lower movable member 12 of the fusion device.

[0045] The positioning support assembly includes positioning grooves 21 symmetrically opened on both sides of the opposite surfaces of the upper movable part 11 and the lower movable part 12 of the fusion device. An internal threaded sleeve 22 is fitted between the two positioning grooves 21 on the same side. One end of the internal threaded sleeve 22 is connected to a threaded rod 23 through an internal thread. One end of the threaded rod 23 is arranged inside the internal threaded sleeve 22 and is rotatably connected to a push rod 24. The push rod 24 is slidably connected to a positioning block 2401 at one end away from the threaded rod 23. The upper and lower surfaces of the push rod 24 are fixedly connected to bevel gear blocks 25 at equal distances. A limiting ring 26 is sleeved on the outer surface of the push rod 24. A clamping block 27 is fixedly connected to the inner surface of the limiting ring 26. The outer surface of the limiting ring 26 is symmetrically rotatably connected to a connecting rod 28. The connecting rod 28 is rotatably connected to a connecting rod 29 on the side close to it.

[0046] Among them, the interior of the internal threaded sleeve 22 is hollow, and the push rod 24 consists of two thick cylindrical rods and two thin cylindrical rods. The two thick cylindrical rods and two thin cylindrical rods in the push rod 24 are horizontally arranged in the order of thick cylindrical rod, thin cylindrical rod, another thick cylindrical rod and another thin cylindrical rod inside the internal threaded sleeve 22. One of the thick cylindrical rods is rotatably connected to the threaded rod 23 at one end arranged inside the internal threaded sleeve 22, and the outer surface of the positioning block 2401 is fixedly connected to the inner wall of the internal threaded sleeve 22.

[0047] Among them, there are two groups of bevel gear blocks 25, both of which are set on the thick columnar rod, and two groups of limit rings 26, clamping blocks 27, connecting rods 28 and connecting rods 29 are set in the horizontal direction. The outer walls of the two groups of limit rings 26 are fixedly connected to the inner wall of the internal threaded sleeve 22, and the two groups of clamping blocks 27 are located on the movement trajectory of the limit rings 26. One side of the clamping block 27 is set as an inclined plane, which fits with the bevel gear block 25.

[0048] Among them, through grooves are opened through the upper and lower surfaces of the internal threaded sleeve 22, and spherical grooves are opened on the walls of the positioning groove 21. The connecting rod 28 consists of a straight rod and a sphere. The end of the connecting rod 28 away from the limiting ring 26 passes through the through groove and extends to the outside of the internal threaded sleeve 22. The sphere at the end of the connecting rod 28 extending to the outside of the internal threaded sleeve 22 is rotatably connected to the inside of the spherical groove, and the connecting rod 29 is rotatably connected to the outer wall of the push rod 24 at one end away from the connecting rod 28.

[0049] Among them, the limit ring 26 and the block 27 are connected by a cross bar. When the inclined plane of the block 27 is squeezed, the cross bar will bend and deform toward the inner wall of the limit ring 26, thereby causing the position of the block 27 to change, so that the block 27 and the bevel gear block 25 are out of conflict, and when the bevel gear block 25 no longer moves, the block 27 is located between adjacent bevel gear blocks 25.

[0050] Further embodiments

[0051] See also Figure 6 and Figure 7 , the spinal intervertebral fusion implant positioning structure further includes a limiting component disposed inside the positioning groove 21;

[0052] The limiting assembly includes an upper positioning disc 31 arranged inside the positioning groove 21, and the bottom surface of the upper positioning disc 31 is symmetrically fixedly connected to a round rod 32, and a lower positioning disc 33 is fitted on the bottom of the upper positioning disc 31. The outer surfaces of the upper positioning disc 31 and the lower positioning disc 33 are fixedly connected to the push rod 24, and the groove wall of the positioning groove 21 is symmetrically provided with a sliding groove 35.

[0053] The lower positioning disc 33 has cylindrical grooves symmetrically formed therein, and the upper positioning disc 31 is connected to the lower positioning disc 33 via a round rod 32 inserted into the cylindrical groove.

[0054] Among them, the upper positioning disc 31 and the lower positioning disc 33 are connected to the inside of the slide groove 35 through the damping sliding of the damping slider 34. The upper positioning disc 31 and the lower positioning disc 33 are both provided with arc grooves on the surface of the side close to the threaded rod 23. The arc grooves on the outer surfaces of the upper positioning disc 31 and the lower positioning disc 33 are jointly fitted to the outer wall of the internal threaded sleeve 22.

[0055] The cross section of the damping slider 34 is set to be T-shaped, and the cross section of the sliding groove 35 is also set to be T-shaped.

[0056] Further embodiments

[0057] See also Figures 1 to 3 The spinal interbody fusion implant positioning structure further includes an auxiliary connection component provided between the upper movable member 11 and the lower movable member 12 of the fusion device;

[0058] The auxiliary connection assembly includes mounting grooves 41 symmetrically provided at both ends of a side close to the upper movable part 11 and the lower movable part 12 of the fusion device, and an elastic support member 42 is fixedly installed between the mounting grooves 41 at the same end.

[0059] Among them, multiple groups of elastic support members 42 are arranged along the horizontal tangent direction of the upper movable member 11 and the lower movable member 12 of the fusion device. Each group of elastic support members 42 is composed of multiple thin rods that are rotatably connected to each other, and multiple interconnected thin rods together form a network structure.

[0060] The working process and principle of the above embodiment are as follows:

[0061] The general process of intervertebral body fusion surgery:

[0062] When performing spinal intervertebral body fusion surgery, medical staff need to cut a gap in the intervertebral disc of the patient's spinal intervertebral body at the site that needs to be treated, then place the intervertebral fusion device into the cut gap, and then fix the adjacent vertebrae together with internal fixation materials such as screws and steel plates. Finally, the surgical incision is cleaned with saline and the wound is sutured layer by layer.

[0063] It should be noted that during the above treatment process, medical staff need to avoid the spinal nerves during the surgical incision. At the same time, before the intervertebral fusion cage is implanted, bone material needs to be placed in the bone graft hole inside the intervertebral fusion cage to assist in the fusion and fixation between adjacent vertebrae.

[0064] Intervertebral fusion cage implantation:

[0065] After the medical staff cuts a gap in the intervertebral disc, they place the intervertebral fusion cage into the gap. To ensure stable fusion between adjacent vertebrae, it is necessary to ensure that the upper and lower surfaces of the intervertebral fusion cage are in stable contact with the adjacent vertebrae.

[0066] After installation, the medical staff inserts a screwdriver into the mounting hole on the threaded rod 23 and then rotates the screwdriver to drive the threaded rod 23 to rotate. Due to the threaded connection between the threaded rod 23 and the internally threaded sleeve 22, and the push rod 24 is rotatably connected to one end of the threaded rod 23 disposed in the internally threaded sleeve 22, as the threaded rod 23 rotates, the threaded rod 23 drives the push rod 24 to generate horizontal displacement in the internally threaded sleeve 22.

[0067] As the push rod 24 moves, the bevel gear block 25 fixedly connected to the upper and lower surfaces of the push rod 24 will move accordingly. Since the limit ring 26 is sleeved on the outer surface of the push rod 24, and the inner surface of the limit ring 26 is fixedly connected to the clamping block 27, one side of the clamping block 27 is set as an inclined plane, and the clamping block 27 is located on the movement trajectory of the bevel gear block 25. Therefore, as the bevel gear block 25 moves, the inclined surface of the bevel gear block 25 will contact the inclined plane of the clamping block 27, and as the bevel gear block 25 continues to move, the connection between the clamping block 27 and the limit ring 26 will be deformed, and then the clamping block 27 will not block the movement of the bevel gear block 25. As the above-mentioned bevel gear block 25 and the clamping block 27 are separated, the clamping block 27 is located between the adjacent bevel gear blocks 25, and as the push rod 24 continues to move, the bevel gear block 25 will continue to move according to the above process under the action of the push rod 24;

[0068] It should be noted that the limiting ring 26 and the clamping block 27 are connected by a crossbar. When the inclined plane of the clamping block 27 is squeezed, the crossbar will bend and deform toward the inner wall of the limiting ring 26, thereby causing the position of the clamping block 27 to change, so that the clamping block 27 and the bevel gear block 25 are no longer in conflict. When the bevel gear block 25 stops moving, the clamping block 27 is located between adjacent bevel gear blocks 25.

[0069] As the push rod 24 moves, the connecting rod 29 connected to the surface of the push rod 24 will produce a horizontal displacement. Since the length of the connecting rod 29 is constant, the connecting rod 28 connected to the other end of the connecting rod 29 will move accordingly. Under the action of the connecting rod 29, the connecting rod 28 will rotate with its connection point with the limit ring 26 as a fulcrum (the rotation direction is away from the push rod 24, see the specific reference). Figure 10 and Figure 11 );

[0070] It should be noted that, since the connecting rod 28 is composed of a straight rod and a sphere, the end of the connecting rod 28 away from the limiting ring 26 passes through the through groove and extends to the outside of the internally threaded sleeve 22, and the sphere at the end of the connecting rod 28 extending to the outside of the internally threaded sleeve 22 is rotatably connected to the inside of the spherical groove. Therefore, the rotation of the connecting rod 28 will increase the vertical distance between the connecting rod 28 and the push rod 24. At this time, the connecting rod 28 rotatably connected to the spherical groove provided on the sphere and the upper movable part 11 of the fusion device and the lower movable part 12 of the fusion device will increase the distance between the upper movable part 11 of the fusion device and the lower movable part 12 of the fusion device, thereby causing the tooth blocks provided on the upper movable part 11 of the fusion device and the lower movable part 12 of the fusion device to contact the surface of the adjacent vertebral body, so that the tooth blocks are in close contact with one end of the vertebral body surface.

[0071] After the surfaces of one side of the upper movable part 11 and the lower movable part 12 of the fusion device are in close contact with the vertebral body, the medical staff again uses a screwdriver to contact the threaded rod 23 provided at the other end, so that the threaded rod 23 rotates, and the upper movable part of the fusion area and the other side of the lower connecting part of the fusion device are in close contact with the adjacent vertebral body, thereby making the entire surface of the intervertebral fusion device in close contact with the adjacent vertebral body, thereby fixing the position of the intervertebral fusion device and forming a stable support between the adjacent vertebral bodies.

[0072] The upper movable member 11, the lower movable member 12, and the expandable connecting rod 28 of the fusion device enable both the upper and lower surfaces of the fusion device to be in close contact with the adjacent vertebrae. Compared with the uniaxial expandable arrangement of existing intervertebral fusion devices, this intervertebral fusion device can be expanded on both sides, thereby ensuring that the contact surfaces between the intervertebral fusion device and the adjacent vertebrae fit closely, forming a stable support between the adjacent vertebrae and facilitating the fixation of the position of the intervertebral fusion device between the adjacent vertebrae, thereby helping to maintain the correct height between the vertebrae and preventing a decrease in vertebral height due to intervertebral disc degeneration or other factors.

[0073] The triangular structure formed by the connecting rod 28, the connecting rod 29 and the push rod 24 provides a stable support between the upper movable part 11 and the lower movable part 12 of the fusion device, thereby preventing the intervertebral fusion device from being deformed by the pressure between adjacent vertebrae during use, and from settling in the intervertebral disc, which would shorten the distance between adjacent vertebrae and cause spinal fusion failure.

[0074] By setting the bevel gear block 25 and the clamping block 27, when the push rod 24 drives the bevel gear block 25 to move, the multiple bevel gear blocks 25 are convenient for medical staff to accurately adjust the moving distance of the push rod 24, and then adjust the distance between the upper movable part 11 of the fusion device and the lower movable part 12 of the fusion device through the connecting rod 28, so as to facilitate accurate adjustment of the support height of the fusion device between adjacent vertebrae. In addition, the clamping block 27 can prevent the reverse movement of the bevel gear block 25, and thus prevent the reverse movement of the push rod 24 and the threaded rod 23 inside the threaded sleeve. The unchanged position of the push rod 24 ensures that the positions of the connecting rod 29 and the connecting rod 28 will not change, thereby ensuring that the distance between the upper movable part 11 of the fusion device and the lower movable part 12 of the fusion device supported by the connecting rod 28 is constant, further preventing the fusion device from being deformed due to excessive pressure between adjacent vertebrae during use;

[0075] During the rotation of the threaded rod 23, due to the threaded connection between the threaded rod 23 and the internally threaded sleeve 22, the rotation of the threaded rod 23 will drive the internally threaded sleeve 22 to have a certain movement tendency. Since the upper positioning disc 31 and the lower positioning disc 33 are both provided with arc grooves on the surface of the side close to the threaded rod 23, the arc grooves on the outer surfaces of the upper positioning disc 31 and the lower positioning disc 33 are jointly fitted with the outer wall of the internally threaded sleeve 22. Therefore, the upper positioning disc 31 and the lower positioning disc 33 can prevent the internally threaded sleeve 22 from moving in the early stage of the movement of the threaded rod 23.

[0076] It should be noted that the damping slider 34 and the wall of the chute 35 are both set to rough surfaces, and the friction between the two is relatively large, making it difficult for the damping slider 34 to move in the wall of the chute 35;

[0077] As the distance between the upper movable part 11 and the lower movable part 12 of the fusion device increases, the upper positioning disc 31 and the lower positioning disc 33 are slidably connected to each other inside the lower positioning disc 33 via the round rod 32 fixedly connected to the upper positioning disc 31. Although the distance between the upper positioning disc 31 and the lower positioning disc 33 increases, the plane formed between the two still prevents the internal threaded sleeve 22 from being fixedly moved laterally.

[0078] As the distance between the upper movable part 11 and the lower movable part 12 of the fusion device increases, since multiple groups of elastic support members 42 are provided along the horizontal tangential direction of the upper movable part 11 and the lower movable part 12 of the fusion device, each group of elastic support members 42 is composed of multiple thin rods that are rotatably connected to each other, and the multiple thin rods connected to each other together form a network structure, and the elastic support members 42 are fixedly connected to the mounting grooves 41, the elastic support members 42 will deform with the movement between the upper movable part 11 and the lower movable part 12 of the fusion device to adapt to the change in the distance between the upper movable part 11 and the lower movable part 12 of the fusion device;

[0079] The upper positioning disc 31 and the lower positioning disc 33 are provided to define the position of the internally threaded sleeve 22, thereby preventing the internally threaded sleeve 22 from moving during use, which would cause the threaded rod 23 to fail to rotate, thereby ensuring the stable use of the intervertebral fusion cage between adjacent vertebral bodies.

[0080] Through the stable connection between the elastic support member 42 and the upper movable member 11 and the lower movable member 12 of the fusion device, the mesh structure of the elastic support member 42 can adapt to the change in the distance between the upper movable member 11 and the lower movable member 12 of the fusion device, and the elastic support member 42 can assist in supporting the position where the connecting rod 28 is not set between the upper movable member 11 and the lower movable member 12 of the fusion device, thereby avoiding deformation of the intervertebral fusion device caused by pressure imbalance during use, and further avoiding failure of the fusion device and settlement between adjacent vertebrae.

[0081] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0082] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A spinal intervertebral fusion implant positioning structure, comprising an upper movable member (11) of the fusion device and a lower movable member (12) of the fusion device, wherein the upper movable member (11) and the lower movable member (12) of the fusion device are mutually engaged, and bone implant holes for implanting bone blocks are provided through the interior of the upper movable member (11) and the lower movable member (12) of the fusion device, and tooth blocks are provided on the upper top surface of the fusion device and the lower bottom surface of the fusion device. A fitting limit block (13) is symmetrically fixedly connected to the outer surface of one side of the upper movable member (11) of the fusion device, and is characterized in that: It also includes a positioning support assembly disposed between an upper movable member (11) and a lower movable member (12) of the fusion device; The positioning support assembly includes positioning grooves (21) symmetrically arranged on both sides of the opposite surfaces of the upper movable part (11) and the lower movable part (12) of the fusion device, an internal threaded sleeve (22) is fitted between the two positioning grooves (21) on the same side, one end of the internal threaded sleeve (22) is connected to a threaded rod (23) through an internal thread, one end of the threaded rod (23) arranged inside the internal threaded sleeve (22) is rotatably connected to a push rod (24), the push rod (24) is slidably connected to a positioning block (2401) at one end away from the threaded rod (23), the upper and lower surfaces of the push rod (24) are fixedly connected to an oblique tooth block (25) at equal distances, the outer surface of the push rod (24) is sleeved with a limiting ring (26), the inner surface of the limiting ring (26) is fixedly connected to a clamping block (27), the outer surface of the limiting ring (26) is symmetrically rotatably connected to a connecting rod (28), and the connecting rod (28) is rotatably connected to a connecting rod (29) on the side close to the connecting rod.

2. The spinal interbody fusion implant positioning structure according to claim 1, characterized in that: The interior of the internal threaded sleeve (22) is hollow, and the push rod (24) consists of two thick columnar rods and two thin columnar rods. The two thick columnar rods and the two thin columnar rods in the push rod (24) are horizontally arranged inside the internal threaded sleeve (22) in the order of thick columnar rod, thin columnar rod, another thick columnar rod and another thin columnar rod. One of the thick columnar rods is rotatably connected to one end of the threaded rod (23) arranged inside the internal threaded sleeve (22), and the outer surface of the positioning block (2401) is fixedly connected to the inner wall of the internal threaded sleeve (22).

3. The spinal interbody fusion implant positioning structure according to claim 2, characterized in that: Two groups of bevel gear blocks (25) are provided. Both groups of bevel gear blocks (25) are provided on the thick columnar rod. Two groups of limit rings (26), clamping blocks (27), connecting rods (28) and connecting rods (29) are provided in the horizontal direction. The outer walls of the two groups of limit rings (26) are fixedly connected to the inner wall of the internal thread sleeve (22). Both groups of clamping blocks (27) are located on the movement trajectory of the limit rings (26). One side of the clamping blocks (27) is provided as an inclined plane, and the inclined plane is in contact with the bevel gear block (25).

4. The spinal interbody fusion implant positioning structure according to claim 2, characterized in that: Through grooves are formed on the upper and lower surfaces of the internal threaded sleeve (22), and spherical grooves are formed on the groove walls of the positioning groove (21). The connecting rod (28) consists of a straight rod and a sphere. The end of the connecting rod (28) away from the limiting ring (26) passes through the through groove and extends to the outside of the internal threaded sleeve (22). The sphere at one end of the connecting rod (28) extending to the outside of the internal threaded sleeve (22) is rotatably connected to the inside of the spherical groove. The end of the connecting rod (29) away from the connecting rod (28) is rotatably connected to the outer wall of the push rod (24).

5. The spinal interbody fusion implant positioning structure according to claim 1, characterized in that: It also includes a limiting component arranged inside the positioning groove (21); The limiting assembly comprises an upper positioning disc (31) arranged inside the positioning groove (21); a round rod (32) is symmetrically fixedly connected to the bottom surface of the upper positioning disc (31); a lower positioning disc (33) is fitted on the bottom of the upper positioning disc (31); a push rod (24) is fixedly connected to the outer surfaces of the upper positioning disc (31) and the lower positioning disc (33); and a sliding groove (35) is symmetrically opened on the groove wall of the positioning groove (21).

6. The spinal interbody fusion implant positioning structure according to claim 5, characterized in that: The lower positioning disc (33) is symmetrically provided with cylindrical grooves, and the upper positioning disc (31) is plugged into the lower positioning disc (33) via a round rod (32) inserted into the cylindrical grooves.

7. The spinal interbody fusion implant positioning structure according to claim 5, characterized in that: The upper positioning disc (31) and the lower positioning disc (33) are connected to the inside of the slide groove (35) by damping sliding through a damping slider (34); the upper positioning disc (31) and the lower positioning disc (33) are both provided with arc grooves on the surfaces of one side close to the threaded rod (23); the arc grooves provided on the outer surfaces of the upper positioning disc (31) and the lower positioning disc (33) are jointly fitted with the outer wall of the internal threaded sleeve (22).

8. The spinal interbody fusion implant positioning structure according to claim 1, characterized in that: It also includes an auxiliary connection assembly disposed between the upper movable part (11) and the lower movable part (12) of the fusion device; The auxiliary connection assembly includes mounting grooves (41) symmetrically arranged at both ends of a side close to the upper movable part (11) and the lower movable part (12) of the fusion device, and an elastic support member (42) is fixedly installed between the mounting grooves (41) at the same end.

9. The spinal interbody fusion implant positioning structure according to claim 8, characterized in that: Multiple groups of elastic support members (42) are arranged along the horizontal tangent direction of the upper movable member (11) and the lower movable member (12) of the fusion device. Each group of elastic support members (42) is composed of multiple thin rods that are rotatably connected to each other, and the multiple thin rods connected to each other together form a network structure.

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