Artificial intervertebral disc with springback function

Abstract

The invention relates to the technical field of artificial intervertebral discs, in particular to an artificial intervertebral disc with a springback function, which comprises an artificial intervertebral disc body, and the artificial intervertebral disc body is of an integrally formed structure or a split structure; the artificial intervertebral disc body comprises an upper fixing plate, a lower fixing plate and an elastic body arranged between the upper fixing plate and the lower fixing plate; the outer surfaces of the upper fixing plate and the lower fixing plate are respectively provided with micropores and biological coatings for bone ingrowth induced by hydroxyapatite, and the upper fixing plate and the lower fixing plate are respectively provided with a plurality of round holes and fixing teeth. The device is reasonable in structural design, can perform multiple fixation on the vertebral body, can perform good axial compression and rebound in the longitudinal axis direction of the human body spine, can perform flexion and extension, lateral bending, rotation and other motions, can reconstruct dynamic stability of an intervertebral long segment after intervertebral disc and vertebral body resection, is high in physiological activity matching degree with the normal human body spine, and has a good application prospect. Implantation is convenient, fixation is stable, rebound resilience is high, and elasticity is lasting.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an artificial intervertebral disc with a rebound function. Background Art

[0002] Degenerative diseases of the cervical and lumbar spine are common diseases in spinal surgery. Fusion, as the ultimate treatment, can fix the diseased segment, correct spinal deformity, and reconstruct the stability of the spine, and has achieved good clinical treatment results. However, with the passage of time, many clinical and basic studies have found that rigid internal fixation + bone graft fusion will accelerate the secondary degeneration of adjacent segments. In this context, the concept of "dynamic fixation" was proposed, that is, while reconstructing the stability of the spine, retaining the beneficial movement and load transfer between segments, without vertebral segment fusion. This dynamic stability mode can retain the mobility of the surgical segment spine to a certain extent and reduce the risk of accelerated degeneration of adjacent segments. Although there is no standard for quantitative evaluation of the range of motion of the unstable lumbar segment by dynamic fixation, the concept and method of dynamic fixation have been accepted by most spinal surgeons, and the corresponding products are increasingly used in clinical practice, such as artificial intervertebral disc, artificial nucleus pulposus, elastic pedicle system, facet joint replacement system and interspinous dynamic fixation system. Among them, artificial intervertebral disc replacement has the highest biomechanical adaptability to the human spine, so it has been studied relatively more.

[0003] The earliest recorded lumbar disc replacement surgery used a metal ball as a lumbar disc prosthesis to be placed between the diseased vertebrae, but ultimately failed due to the sinking and failure of the prosthesis. With the development of technology, the design of the prosthesis has evolved from the initial inelastic prosthesis and elastic prosthesis to the current articulated inelastic prosthesis. Most current artificial disc products can achieve horizontal movement and rotational movement, but it is difficult to provide good elastic cushioning along the longitudinal axis of the spine. At present, the inability to perform sufficient axial compression and good rebound along the longitudinal axis of the human spine is a bottleneck encountered in the existing artificial disc design. Other problems such as insufficient fixation and excessive wear can also lead to a series of complications. At present, at the technical level, an integrated elastic artificial intervertebral disc has been designed and a series of patents have been obtained. It can simulate the normal human intervertebral disc to a certain extent to adapt to the problems of axial compression and rebound along the longitudinal axis of the spine. However, due to structural limitations, the elastic structure of the existing artificial intervertebral disc with rebound function is difficult to perform sufficient axial elastic compression and rebound along the longitudinal axis of the spine, and the connection between it and the vertebral body is also not stable enough. After long-term use, it is easy to produce obvious elastic attenuation and / or prosthesis loosening, which will affect the long-term use effect of the prosthesis.

[0004] In recent years, some people have designed polyurethane artificial intervertebral discs, which have good elasticity. However, medical polyurethane, like other polyurethane materials, will age over time, under the influence of environmental factors and repeated mechanical stress. The aging process may lead to a decline in material performance, such as weakening of strength, reduction of elasticity, and cracking. In addition, when one or more vertebrae of the spine are removed, the adjacent upper and lower intervertebral discs will also be removed, thus causing segmental intervertebral defects. For such long segmental intervertebral defects, intervertebral fusion is often performed clinically. However, there is currently no corresponding artificial intervertebral disc product with good elasticity in the world to reconstruct the dynamic stability of long segment intervertebral defects of the spine.

[0005] Therefore, it is necessary to design an artificial intervertebral disc with good rebound function in this application to solve the above technical problems. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an artificial intervertebral disc with a rebound function, which has a reasonable structural design, can perform multiple fixations on the vertebral body, can perform good axial compression and rebound along the longitudinal axis of the human spine, can perform flexion and extension, scoliosis and rotation and other movements, and can also reconstruct the dynamic stability of the long intervertebral segment after the intervertebral disc + vertebral body resection. It has a high degree of matching with the physiological activities of the normal human spine, is easy to implant, has stable fixation, strong rebound resilience and lasting elasticity.

[0007] To achieve the above-mentioned purpose, the present invention provides an artificial intervertebral disc with a rebound function, comprising an artificial intervertebral disc body, wherein the artificial intervertebral disc body is an integrally formed structure or a split structure; the artificial intervertebral disc body comprises an upper fixing plate, a lower fixing plate, and an elastic body arranged between the upper fixing plate and the lower fixing plate; the outer surfaces of the upper fixing plate and the lower fixing plate are respectively covered with micropores and a hydroxyapatite biological coating for inducing bone growth, and the upper fixing plate and the lower fixing plate are respectively provided with a plurality of circular holes and fixing teeth; the spacing between the ports at one end of the upper fixing plate and the lower fixing plate is greater than the spacing between the ports at the other end; the elastomer is composed of one group of elastic monomers or multiple groups of elastic monomers.

[0008] Preferably, the upper fixing plate or the lower fixing plate is of circular or non-circular structure, the upper fixing plate or the lower fixing plate is provided with or without an extension plate, and the angle surface connecting the upper fixing plate or the lower fixing plate with the vertebral body is flat or convex; one end of the upper fixing plate or the lower fixing plate located at the large-pitch port is provided with or without an extension plate, and a circular screw hole is provided on the extension plate, and a locking thread is provided in the circular screw hole for inserting a locking screw, and an anti-retraction screw is provided on one side of the circular screw hole to prevent the locking screw from retreating, or a pin hole is provided on the extension plate of the end of the upper fixing plate or the lower fixing plate for auxiliary fixation by a pin during surgery, the pin is provided with a base larger than the pin hole, and the pin hole is designed in a stepped shape to prevent the pin base from falling out toward the vertebral body, and the pin is provided with anti-retraction teeth to prevent the pin from retreating in the direction away from the vertebral body.

[0009] Preferably, the elastomer is composed of one or two groups of elastic monomers; the upper fixed plate and the lower fixed plate in the gap between the two groups of elastic monomers are fixedly connected with a pin or provided with a pin hole and equipped with a movable pin; when the elastomer is composed of a group of monomers, the upper fixed plate or the lower fixed plate in front of and / or on the side of the elastomer is fixedly connected with a pin or provided with a pin hole and equipped with a movable pin.

[0010] Preferably, the movable bolt is assembled in the bolt holes on the upper fixing plate and the lower fixing plate in the initial state, the tip of the bolt slightly protrudes from the surface of the upper fixing plate or the lower fixing plate, the middle of the bolt has an expansion joint, anti-retraction teeth are provided on both sides of the bolt, and the bottom of the bolt has a base to prevent the bolt from slipping out in the direction of the vertebral body. When the bolt moves from the bolt hole on the upper fixing plate or the lower fixing plate into the vertebral body, the anti-retraction teeth on both sides of the bolt can be stuck on the surface of the upper fixing plate or the lower fixing plate so that it cannot slip out in the direction away from the vertebral body. In addition, the base at the bottom of the bolt is larger than the insertion hole, so the bolt cannot slip out into the vertebral body through the fixing plate.

[0011] Preferably, the group of elastic monomers are connected to the connecting plate by a partially open circle and then connected to the upper fixed plate as a whole, and the lower connecting plate is connected to a circular chassis; the group of elastic monomers are connected to the connecting plate by a partially open circle, the upper connecting plate is connected to the upper fixed plate as a whole, the lower connecting plate is connected to the circular chassis and then in contact with the lower fixed plate through the circular chassis (split type), or the elastic monomers are connected to the upper fixed plate and the lower fixed plate as a whole through the connecting plate (integrated type).

[0012] Preferably, the group of elastic monomers is connected to the connecting plate by two circular openings facing each other and then connected to the upper fixed plate as a whole and then in contact with the lower fixed plate (split type), or a group of elastic monomers is connected to the connecting plate by two circular openings facing each other and then connected to the upper fixed plate and the lower fixed plate as a whole (integrated type).

[0013] Preferably, the group of elastic monomers is composed of three groups of circular shapes opening toward each other, connected to the connecting plate and then respectively connected to the upper fixing plate and the lower fixing plate to form an integral whole.

[0014] Preferably, the group of elastic monomers is connected to the connecting plate by a group of circles opening towards each other and two circles partially opening in the same direction, and then connected to the upper fixed plate and the lower fixed plate respectively; the group of elastic monomers is connected to the connecting plate by a group of circles opening towards each other and two circles opening in different directions, and then connected to the upper fixed plate and the lower fixed plate respectively; the group of elastic monomers is connected by four circles partially opening, and then connected to the upper fixed plate and the lower fixed plate respectively; the group of elastic monomers is connected by three circles opening in the same direction, and then connected to the upper fixed plate and the lower fixed plate respectively through the connecting plate; the group of elastic monomers is connected by a group of partially open circles through the connecting plate, and then directly connected to the upper fixed plate and the lower fixed plate respectively.

[0015] Preferably, the outer surface of the upper fixing plate or the lower fixing plate is processed by porosity and sprayed with a biological coating such as hydroxyapatite; a plurality of the fixing teeth are evenly distributed on the upper fixing plate or the lower fixing plate, and the circular holes on the upper fixing plate or the lower fixing plate facilitate bone embedding or growth.

[0016] Preferably, the upper fixing plate and the lower fixing plate are connected to the elastomer through a connecting plate, or the upper fixing plate is connected to the elastomer through a connecting plate and the bottom of the connecting plate below the elastomer is connected to a circular chassis, which is called an upper structure, and the upper surface of the lower fixing plate is a groove structure with a concave middle and a convex edge to accommodate the chassis of the upper structure and allow the chassis to rotate in the concave shape of the lower fixing plate and translate 1 to 3 mm; or the lower fixing plate is fixed with a polyethylene liner through its concave part, and the upper surface of the polyethylene liner is concave to accommodate the chassis and allow the chassis to rotate in the polyethylene concave shape and translate 1 to 3 mm; the connecting plate is a solid plate structure or a hollow plate structure.

[0017] By adopting the above technical scheme: the artificial intervertebral disc with rebound function is an integrated or split structure; it is made of medical biomaterials such as titanium alloy, and when it is integrated, it can be used for patients with small activities, and no wear particles are generated when it works, which solves the problem that the loose and falling parts of the combined artificial intervertebral disc and the inflammatory reaction of particles generated by wear easily cause discomfort to patients; when the artificial intervertebral disc is integrated or split, it has good axial elastic compression and rebound function when it works, and can achieve good compression and rebound of the surgical segment spine in the direction of the longitudinal axis of the human body, and can also achieve flexion and extension in the sagittal position, lateral bending in the left and right directions, rotation in the coronal position, and elastic stability of the circumference formed by comprehensive movement in multiple directions; it has the advantages of simple structure, convenient implantation, stable fixation, strong axial elastic buffering force, good rebound resilience, and lasting elasticity, which meets the needs of long-term physiological activities of the human spine. In addition, when some cases need to perform vertebral resection during surgery, the present invention can also be used for cases of long segment intervertebral defects of the spine after vertebral resection + disc resection.

[0018] Compared with the prior art, the artificial intervertebral disc with rebound function of the present invention has the following beneficial effects and advantages:

[0019] 1. The present invention adopts a unique partially open circle as the main body of the elastic structure, and the circular opening is connected to the connecting plate. The longitudinal pressure from the spine makes the circular opening smaller through the connecting plate, thereby buffering the axial pressure of the spine. When the circular opening becomes smaller, the circular rebound force gradually increases as the opening spacing becomes smaller, thereby having a good rebound function.

[0020] 2. The middle of the upper fixing plate and the lower fixing plate in the present invention is fixedly connected with a pin or movably connected with a pin, and the pin can be inserted into the middle of the vertebral body for more stable fixation. The extension plate on the fixing plate is also provided with screw holes for auxiliary fixation by screws or pin holes for auxiliary fixation by pins to further enhance the fixing effect.

[0021] 3. The outer surface of the fixing plate of the present invention is porous and sprayed with biological coatings such as hydroxyapatite to facilitate bone ingrowth after implantation. The fixing plate is also provided with larger circular holes to facilitate bone embedding or ingrowth, thereby further enhancing the long-term stability of the prosthesis after implantation.

[0022] 4. When the present invention is in an integrated configuration, it can be used for patients with low activity levels. No wear particles are generated during operation, thus solving the problem of loosening and falling off of components of combined artificial intervertebral discs and inflammatory reactions of particles generated by wear that can easily cause discomfort to patients.

[0023] 5. When the present invention is in an integrated or split configuration, it has good axial elastic compression and rebound functions when working, and can achieve good compression and rebound of the surgical segment spine in the direction of the human body's longitudinal axis, and can also achieve elastic stability of flexion and extension in the sagittal plane, lateral bending in the left and right directions, rotation in the coronal plane, and circumferential rotation formed by comprehensive movements in multiple directions.

[0024] 6. The present invention has the advantages of simple structure, convenient implantation, stable fixation, strong axial elastic buffering force, good resilience, and lasting elasticity, etc., which meet the needs of long-term physiological activities of the human spine. When vertebral resection is required during surgery in certain cases, the present invention can also be used for cases of long-segment intervertebral defects in the spine after vertebral resection + discectomy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of the artificial intervertebral disc with rebound function of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure without a latch in the present invention;

[0028] Figure 3 It is a schematic diagram of the structure in which the elastic monomer in the present invention is two circular shapes with openings facing each other and connected to a connecting plate and then connected to an upper and a lower fixing plate;

[0029] Figure 4 It is a structural schematic diagram of the elastic monomer in the present invention, which is a partially open circle connected to the connecting plate and then connected to the upper fixing plate as a whole, and the lower connecting plate is connected to a circular bottom plate;

[0030] Figure 5 It is a schematic diagram of the structure in which a locking screw is installed on the extension plate of the present invention;

[0031] Figure 6 The schematic diagram of the elastic monomer in the present invention is that three groups of circular shapes with openings facing each other are connected to the connecting plate and then connected to the upper and lower fixing plates to form an integral body and are fixed by bolts and screws;

[0032] Figure 7 It is a schematic diagram of the elastic monomer in the present invention, which is a group of circles with openings facing each other and two circles with openings in different directions connected to a connecting plate and then connected to upper and lower fixing plates to form an integral whole;

[0033] Figure 8It is a schematic diagram of the structure of the latch in the present invention;

[0034] Fig. 9 It is a structural schematic diagram of the lower fixing plate in the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0036] See below Figures 1 to 9 The artificial intervertebral disc with rebound function of the present invention is described in detail.

[0037] The artificial intervertebral disc with rebound function of the present invention comprises an artificial intervertebral disc body, which is an integrally formed structure or a split structure; the artificial intervertebral disc body comprises an upper fixing plate 1, a lower fixing plate 2, and an elastic body 3 arranged between the upper fixing plate 1 and the lower fixing plate 2; the outer surfaces of the upper fixing plate 1 and the lower fixing plate 2 are respectively covered with micropores and hydroxyapatite biological coatings for inducing bone growth, and the upper fixing plate 1 and the lower fixing plate 2 are respectively provided with a plurality of circular holes 4 and fixing teeth 5; the spacing between the ports at one end of the upper fixing plate 1 and the lower fixing plate 2 is greater than the spacing between the ports at the other end; the elastic body 3 is composed of one group of elastic monomers or multiple groups of elastic monomers.

[0038] Among them, a plurality of fixing teeth 5 are evenly distributed on the upper fixing plate 1 or the lower fixing plate 2, and the tops of the fixing teeth 5 are sharp. The purpose of arranging the fixing teeth 5 in this way is to enable each fixing tooth to be inserted into the end surface of the vertebra at multiple points, so that the artificial intervertebral disc can be fixed between the vertebrae.

[0039] Specifically, the upper fixing plate 1 or the lower fixing plate 2 is in a circular or non-circular structure. In actual application, the outer surface of the upper fixing plate 1 or the lower fixing plate 2 is in an arc-shaped surface or a plane. When the surface of the upper fixing plate 1 or the lower fixing plate 2 is in an arc-shaped surface, the curvature of the arc corresponds to the curvature of the end face of the vertebra. When the surface of the upper fixing plate 1 or the lower fixing plate 2 is in a plane, the plane corresponds to the end face of the vertebra after grinding. The purpose of such a setting is to make the upper and lower surfaces of the upper fixing plate or the lower fixing plate fit closely with the upper and lower end faces of the vertebra, thereby increasing the force-bearing area.

[0040] Specifically, the upper fixing plate 1 or the lower fixing plate 2 is provided with or without an extension plate 6, and the angle surface of the upper fixing plate 1 or the lower fixing plate 2 connected to the vertebral body is flat or convex; one end of the upper fixing plate 1 or the lower fixing plate 2 located at the large-pitch port is provided with or without an extension plate 6, and the extension plate 6 is provided with a circular screw hole 7, and a locking thread is provided in the circular screw hole 7 for inserting a locking screw 8, and an anti-retraction screw 9 is provided on one side of the circular screw hole 7 to prevent the locking screw 8 from retreating, or the extension plate 6 at the end of the upper fixing plate 1 or the lower fixing plate 2 is provided with a pin hole 10 for auxiliary fixation with a pin 11 during surgery, and the pin 11 is provided with a pin base 11-1 larger than the pin hole 10, and the pin hole 10 is designed in a stepped shape to prevent the pin base 11-1 from falling out toward the vertebral body, and the pin 11 is provided with an anti-retraction tooth 11-2 to prevent the pin from retreating in the direction away from the vertebral body.

[0041] Among them, the pin can be inserted into the vertebral bone through the upper fixation plate or the lower fixation plate, so as to further obtain a more stable fixation. A screw hole or a pin hole is provided on the extension plate of the upper fixation plate or the lower fixation plate, and a locking thread is provided in the screw hole. The locking screw can be fixed to the vertebral body through the screw hole, or the pin can be used to fix it to the vertebral body through the pin hole, so as to further strengthen the fixation effect of the fixation plate on the vertebral body.

[0042] Among them, the spacing between the ports at one end of the upper fixing plate 1 and the lower fixing plate 2 is larger than the spacing between the ports at the other end to adapt to the physiological lordosis of the normal human spine; and because the amplitude and frequency of the human body's bowing and bending movements are much larger than the amplitude and frequency of the human body's backward leaning, rotation and lateral bending movements; therefore, when assembling the artificial intervertebral disc, the large-spacing ports of the fixing plate are located in the front part of the intervertebral space.

[0043] Among them, an extension plate 6 is provided at one end of the upper fixing plate 1 or the lower fixing plate 2 located at the large-pitch port. The purpose of arranging the extension plate 6 at one end of the upper fixing plate 1 or the lower fixing plate 2 located at the large-pitch port is to facilitate the artificial intervertebral disc to be embedded between the vertebrae from the front during surgery, so that the connecting plate can correspond to the front surface of the vertebrae, that is, the problem of the extension plate hindering the embedding of the artificial intervertebral disc is avoided, and the artificial intervertebral disc can be fixedly connected to the vertebrae from front to back through the extension plate and screws or pins to enhance the fixation effect and maintain the physiological lordosis of the surgical segment spine after the prosthesis is implanted. When used in the human lumbar spine, another design is that the extension plate on the upper fixing plate or the lower fixing plate is arranged on the side, so that some doctors are accustomed to implanting artificial intervertebral discs from the side approach.

[0044] Specifically, the elastic body 3 is composed of one or two groups of elastic monomers; the upper fixed plate 1 and the lower fixed plate 2 in the gap between the two groups of elastic monomers are fixedly connected with a pin or provided with a pin hole and equipped with a movable pin 11; when the elastic body 3 is composed of a group of monomers, the upper fixed plate 1 or the lower fixed plate 2 in front of and / or on the side of the elastic body is fixedly connected with a pin or provided with a pin hole and equipped with a movable pin 11.

[0045] Specifically, the movable bolt 11 is assembled in the bolt hole on the upper fixing plate 1 or the lower fixing plate 2 in the initial state, and the tip of the bolt slightly protrudes from the surface of the upper fixing plate 1 or the lower fixing plate 2. The middle of the bolt 11 has an expansion joint 11-3, and anti-retraction teeth 11-2 are provided on both sides of the bolt 11. The bottom of the bolt 11 is provided with a bolt base 11-1 to prevent the bolt from slipping out in the direction of the vertebral body. When the bolt 11 moves from the bolt hole on the upper fixing plate 1 or the lower fixing plate 2 into the vertebral body, the anti-retraction teeth 11-2 on both sides of the bolt 11 can be stuck on the surface of the upper fixing plate 1 or the lower fixing plate 2 so that it cannot slip out in the direction away from the vertebral body. In addition, the bolt base at the bottom of the bolt 11 is larger than the insertion hole, so the bolt cannot slip out into the vertebral body through the fixing plate.

[0046] As a variation of the present invention, the group of elastic monomers is connected to the connecting plate 3-2 by a partially open circle 3-1 and then connected to the upper fixed plate 1 as a whole, and the connecting plate 3-2 below is connected to a circular bottom plate 3-3.

[0047] As another variation of the present invention, the group of elastic monomers is connected to the connecting plate 3-2 by a partially open circle 3-1, the upper connecting plate 3-2 is connected to the upper fixing plate 1 as a whole, the lower connecting plate 3-2 is connected to the circular bottom plate 3-3 and then contacts the lower fixing plate 2 through the circular bottom plate 3-3 (split type), or the elastic monomer is connected to the upper fixing plate 1 and the lower fixing plate 2 as a whole through the connecting plate 3-2 (integrated type). Such a setting can better increase the range of motion after the implantation of the prosthesis, especially the flexion and extension range of motion of the spine in the front-back direction of the human body, because the flexion range of motion of the spine is significantly greater than the extension range of motion, and is much greater than the scoliosis and rotation range of motion, so it is used for cases with large flexion and extension range of motion of the spine.

[0048] As another variation of the present invention, the set of elastic monomers is connected to the connecting plate 3-2 by two circular openings 3-1 facing each other, and then connected to the upper fixing plate 1 as a whole, and then in contact with the lower fixing plate 2 (split type), or the set of elastic monomers is connected to the connecting plate 3-2 by two circular openings 3-1 facing each other, and then connected to the upper fixing plate 1 and the lower fixing plate 2 as a whole (integral type). Such a setting can better increase the mobility and stability of the prosthesis after implantation, and is used for cases with normal mobility.

[0049] As another variation of the present invention, the elastic monomer is composed of three groups of circular openings 3-1 connected to the connecting plate 3-2 and then connected to the upper fixing plate 1 and the lower fixing plate 2. This can be used for cases with normal range of motion and vertebral body + disc removal.

[0050] As another variation of the present invention, the group of elastic monomers is composed of a group of circular shapes 3-1 with openings facing each other and two circular shapes 3-1 with openings in the same direction connected to the connecting plate 3-2 and then connected to the upper fixing plate 1 and the lower fixing plate 2 respectively;

[0051] As another variation of the present invention, the group of elastic monomers is composed of a group of circles 3-1 with openings facing each other and two circles 3-1 with openings in different directions connected to a connecting plate 3-2 and then respectively connected to an upper fixing plate and a lower fixing plate; this can be used for cases with a large range of extension and flexion activities.

[0052] As another variation of the present invention, the group of elastic monomers is connected by four partially open circles 3-1 and then connected to the upper fixing plate 1 and the lower fixing plate 2 respectively; it has good elastic buffering and rebound functions in the direction along the longitudinal axis of the spine.

[0053] As another variation of the present invention, the group of elastic monomers is composed of three circular shapes 3-1 with openings in the same direction, connected to the upper fixing plate 1 and the lower fixing plate 2 through the connecting plate 3-2;

[0054] As another variation of the present invention, the elastic monomers are composed of a group of partially open circles 3-1 connected by a connecting plate 3-2, and another group of partially open circles 3-1 are directly connected and then connected to the upper fixing plate 1 and the lower fixing plate 2. It is used for cases with relatively large range of motion and vertebral body + disc removal.

[0055] The upper fixed plate 1 and the lower fixed plate 2 are connected to the elastomer 3 through the connecting plate 3-2, or the upper fixed plate 1 is connected to the elastomer 3 through the connecting plate 3-2 and the bottom of the connecting plate 3-2 below the elastomer 3 is connected with a circular chassis 3-3, which is called an upper structure, and the upper surface of the lower fixed plate 2 is a groove structure 2-1 with a concave middle and a convex edge to accommodate the circular chassis 3-3 of the upper structure and allow the circular chassis 3-3 to rotate in the concave shape on the lower fixed plate 2 and translate 1 to 3 mm; or the lower fixed plate 2 is fixed with a polyethylene liner through its concave part, and the upper surface of the polyethylene liner is concave to accommodate the chassis and allow the chassis to rotate in the polyethylene concave shape and translate 1 to 3 mm; the connecting plate 3-2 is a solid plate structure or a hollow plate structure.

[0056] In this embodiment, when the present invention is an integrated structure, it can be used for patients with little activity. No wear particles are generated when it works, which solves the problem that the loosening and falling off of the components of the combined artificial intervertebral disc and the inflammatory reaction of the particles generated by wear can easily cause discomfort to the patient; when it is set in a split type, it not only has good axial elastic compression and rebound functions when working, but also can fully realize flexion and extension in the sagittal plane, lateral bending in the left and right directions, front and back left and right translation, coronal rotation and comprehensive movement in multiple directions. The contact area between the chassis and the lower fixing plate is large, and the stress distribution is wide during activity, so the wear resistance is strong; further, when used for patients with large activity, a high-cross-linked polyethylene lining can be fixed on the lower fixing plate to further increase the wear resistance.

[0057] When the artificial intervertebral disc with a rebound function is an integrated structure, during its implantation into a human body with a spinal disease, the upper and lower vertebral end plates are first processed, and then the artificial intervertebral disc is gently hammered into the intervertebral space from the front or side, and then the lateral pin is driven into the vertebral body with a matching cone inserter. Finally, as needed, the pin can be driven into the vertebral body through the socket on the extension plate to strengthen fixation, or it can be fixed to the vertebral body with a locking screw through the screw hole on the extension plate, and the anti-retraction pin next to the screw hole is turned so that the tail cap of the anti-retraction pin presses the tail cap of the locking pin to prevent the locking screw from loosening and falling out later.

[0058] In summary, the present invention realizes the axial compression and rebound of the spinal surgical segment along the longitudinal axis of the spine, the flexion and extension in the sagittal plane, the lateral bending in the left and right directions, the rotation in the coronal plane, and the elastic activity of the circumferential rotation formed by the comprehensive movement in multiple directions through the elastic body. The operation time is short, the implantation is convenient, the fixation is stable, and it has good axial buffering force and rebound performance along the longitudinal axis of the human spine, and has strong anti-elastic attenuation ability, which is adapted to the physiological activity pattern of the human spine. When a vertebral resection is performed during the operation to cause an intervertebral defect of a longer segment, the present invention is also used for cases of long segment intervertebral defects of the spine after vertebral resection + discectomy to reconstruct the dynamic stability of the long distance between the vertebrae of the spine.

[0059] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be understood by anyone familiar with the technology within the technical scope disclosed by the present invention should be included in the scope of the present invention.

Claims

1. An artificial intervertebral disc with a rebound function, comprising an artificial intervertebral disc body, characterized in that: The artificial intervertebral disc body is an integrally formed structure or a split structure; the artificial intervertebral disc body includes an upper fixing plate, a lower fixing plate, and an elastic body arranged between the upper fixing plate and the lower fixing plate; the outer surfaces of the upper fixing plate and the lower fixing plate are respectively covered with micropores and hydroxyapatite biological coatings for inducing bone growth, and the upper fixing plate and the lower fixing plate are respectively provided with a plurality of circular holes and fixing teeth; the spacing between the ports at one end of the upper fixing plate and the lower fixing plate is greater than the spacing between the ports at the other end; the elastomer is composed of a group of elastic monomers or a plurality of groups of elastic monomers.

2. The artificial intervertebral disc with rebound function according to claim 1, characterized in that: The upper fixing plate or the lower fixing plate is of circular or non-circular structure, and the upper fixing plate or the lower fixing plate is provided with or without an extension plate, and the angle surface connecting the upper fixing plate or the lower fixing plate with the vertebral body is flat or convex; one end of the upper fixing plate or the lower fixing plate located at the large-pitch port is provided with or without an extension plate, and a circular screw hole is provided on the extension plate, and a locking thread is provided in the circular screw hole for inserting a locking screw, and an anti-retraction screw is provided on one side of the circular screw hole to prevent the locking screw from retreating, or a pin hole is provided on the extension plate of the end of the upper fixing plate or the lower fixing plate for auxiliary fixation with a pin during surgery, and a pin base larger than the pin hole is provided on the pin, and the pin hole is designed in a stepped shape to prevent the pin base from falling out toward the vertebral body, and an anti-retraction tooth is provided on the pin to prevent the pin from retreating in the direction away from the vertebral body.

3. The artificial intervertebral disc with rebound function according to claim 2, characterized in that: The elastic body is composed of one or two groups of elastic monomers; the upper fixed plate and the lower fixed plate in the gap between the two groups of elastic monomers are fixedly connected with a latch or provided with a latch hole and equipped with a movable latch; when the elastic body is composed of a group of monomers, the upper fixed plate or the lower fixed plate in front of and / or on the side of the elastic body is fixedly connected with a latch or provided with a latch hole and equipped with a movable latch.

4. The artificial intervertebral disc with rebound function according to claim 3, characterized in that: The movable latch is assembled in the latch holes on the upper fixing plate and the lower fixing plate in the initial state, and the tip of the latch slightly protrudes from the surface of the upper fixing plate or the lower fixing plate. An expansion joint is provided in the middle of the latch, and anti-retraction teeth are provided on both sides of the latch. The bottom of the latch is provided with a latch base to prevent the latch from falling out in the direction of the vertebral body. When the latch moves from the latch hole on the upper fixing plate or the lower fixing plate into the vertebral body, the anti-retraction teeth on both sides of the latch can be stuck on the surface of the upper fixing plate or the lower fixing plate so that it cannot fall out in the direction away from the vertebral body.

5. The artificial intervertebral disc with rebound function according to claim 3, characterized in that: The group of elastic monomers is connected to the connecting plate through a partially open circle and then connected to the upper fixing plate as a whole, and the connecting plate below is connected to a circular bottom plate; The group of elastic monomers are connected to the connecting plate by a partially open circle, the upper connecting plate is connected to the upper fixed plate as a whole, the lower connecting plate is connected to the circular chassis and then contacts the lower fixed plate through the circular chassis, or the elastic monomer is connected to the upper fixed plate and the lower fixed plate as a whole through the connecting plate.

6. The artificial intervertebral disc with rebound function according to claim 3, characterized in that: The elastic monomers are connected to the connecting plate by two circular openings facing each other, and then connected to the upper fixing plate as a whole, and then contact the lower fixing plate; or the elastic monomers are connected to the connecting plate by two circular openings facing each other, and then connected to the upper fixing plate and the lower fixing plate as a whole.

7. The artificial intervertebral disc with rebound function according to claim 3, characterized in that: The elastic monomer is composed of three groups of circular shapes with openings facing each other, which are connected with the connecting plate and then connected with the upper fixing plate and the lower fixing plate respectively to form a whole.

8. The artificial intervertebral disc with rebound function according to claim 3, characterized in that: The elastic monomers are connected to the connecting plate and are respectively connected to the upper fixing plate and the lower fixing plate to form a whole. The group of elastic monomers is connected to the connecting plate and respectively connected to the upper fixing plate and the lower fixing plate to form a whole. The group of elastic monomers is connected by four partially open circles and then connected to the upper fixing plate and the lower fixing plate respectively to form a whole; The group of elastic monomers is composed of three circular shapes with openings in the same direction, which are connected to the upper fixing plate and the lower fixing plate through connecting plates. The group of elastic monomers is composed of a group of partially open circles connected by a connecting plate, another group of partially open circles directly connected, and then respectively connected to the upper fixing plate and the lower fixing plate to form a whole.

9. The artificial intervertebral disc with rebound function according to claim 1, characterized in that: The plurality of fixing teeth are evenly distributed on the upper fixing plate and the lower fixing plate.

10. The artificial intervertebral disc with rebound function according to claim 1, characterized in that: The upper fixing plate and the lower fixing plate are connected to the elastic body through the connecting plate, or the upper fixing plate is connected to the elastic body through the connecting plate and the bottom of the connecting plate below the elastic body is connected to a circular chassis, which is called the upper structure, and the upper surface of the lower fixing plate is a groove structure with a concave middle and a convex edge to accommodate the chassis of the upper structure and allow the chassis to rotate in the concave shape of the lower fixing plate and perform a translation of 1 to 3 mm; or the lower fixing plate is fixed with a polyethylene liner through its concave part, and the upper surface of the polyethylene liner is concave to accommodate the chassis and allow the chassis to rotate in the polyethylene concave shape and perform a translation of 1 to 3 mm; The connecting plate is a solid plate structure or a hollow plate structure.

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