A hyperbolic dual-motion intervertebral fusion cage and a preparation method thereof

Abstract

The present invention relates to the technical field of lumbar fusion devices, and specifically to a hyperbolic double-action intervertebral fusion device and a preparation method thereof, comprising two spinal fusion mechanisms, a hyperbolic pad is arranged between the two spinal fusion mechanisms, guide grooves are provided in the upper and lower ends of the hyperbolic pads, one end of the spinal fusion mechanism close to the hyperbolic pad is movably connected to the guide groove, the upper and lower ends of the hyperbolic pad are arranged in an arc shape, and the end of the spinal fusion mechanism away from the hyperbolic pad is fused into the spine; the spinal fusion mechanism is clamped between two groups of transmission tooth plates, and the two spinal fusion mechanisms are brought into contact with each other by using an adjustment locking mechanism, the two spinal fusion mechanisms are arranged between vertebrae through an incision, the two spinal fusion mechanisms are propped up by using the adjustment locking mechanism, the hyperbolic pad is arranged between the two spinal fusion mechanisms, and the spinal fusion mechanism and the hyperbolic pad are connected in coordination by using the adjustment locking mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of lumbar fusion devices, in particular to a hyperbolic double-motion intervertebral fusion device and a preparation method thereof. Background Art

[0002] Cervical spondylosis and spinal degenerative lesions mainly cause neck and waist pain, and even neurological damage, which seriously affect patients' daily work and life. If the effect of regular conservative treatment is not obvious, or the symptoms are even further aggravated, surgery is usually required to relieve the symptoms and fundamentally treat them. Intervertebral fusion devices can be implanted by minimally invasive surgery, which has the advantages of small incision, less trauma, less postoperative pain, shorter hospitalization time, and faster recovery. They are increasingly widely used in clinical practice.

[0003] Although there is a huge demand for intervertebral fusion surgery, the existing intervertebral fusion prostheses have different shapes. Early intervertebral fusion devices were mainly made of machined titanium alloy or PEEK, but even if the surface of the machined intervertebral fusion device was made into a tooth-like structure, it was still difficult to achieve good fusion at the contact interface with the bone. With the maturity and popularization of 3D printing technology, intervertebral fusion devices mainly made of PEEK materials, titanium alloy materials, and pure tantalum materials using 3D printing technology have emerged. The advantage of 3D printing technology is that the prepared intervertebral fusion device has a porous structure, which can achieve rapid fusion with bone cells and reduce the occurrence of some loosening complications.

[0004] For example, the Chinese patent with announcement number CN113081406A discloses an intervertebral fusion device, including: a main frame structure, the main frame structure has a hollow inner cavity, the main frame structure includes a front support component, a rear support component, a left support component, a right support component, an upper support component and a lower support component; the upper support component is provided with an upper through hole, and the lower support component is provided with a lower through hole; the main frame structure is provided with a clamping groove; the interior of the main frame structure is filled with a porous structure, the porous structure includes a plurality of unit cell structures, and two adjacent unit cell structures are connected.

[0005] However, the above scheme has the following shortcomings: in the above patent, the interior of the main frame structure is filled with a porous structure, and the support beams of each unit cell structure form an internal hollow monomer frame structure, then each unit cell structure has pores for the growth of artificial bone or autologous bone, thereby realizing the growth process of artificial bone or autologous bone and accelerating the fusion speed. However, this type of fusion device is designed as an integrated molding, which means that when installing the fusion device, it is necessary to open a wound on the patient's body that is larger than the size of the fusion device before the fusion device can be installed. At the same time, during the installation process, the operator needs to support the upper and lower lumbar vertebrae before installing the fusion device, which is relatively cumbersome. For this reason, we have introduced a hyperbolic double-motion intervertebral fusion device and a preparation method thereof. Summary of the invention

[0006] The object of the present invention is to provide a hyperbolic dual-motion intervertebral fusion cage and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A hyperbolic double-action intervertebral fusion device, comprising two spinal fusion mechanisms, a hyperbolic pad is arranged between the two spinal fusion mechanisms, guide grooves are provided in the upper and lower ends of the hyperbolic pads, one end of the spinal fusion mechanism close to the hyperbolic pad is movably connected in the guide groove, the upper and lower ends of the hyperbolic pad are arranged in an arc shape, the end of the spinal fusion mechanism away from the hyperbolic pad is fused into the spine, and the two spinal fusion mechanisms slide along the hyperbolic pads to achieve the freedom of a normal flexible intervertebral disc;

[0009] Both ends of the two spinal fusion mechanisms are provided with transmission tooth plates, and the transmission tooth plates are fixedly connected with a clamping rod on one side close to the spinal fusion mechanism. The clamping rod is clamped in the spinal fusion mechanism, and is clamped in the spinal fusion mechanism through the clamping rod, so that when the transmission tooth plate moves, it can drive the spinal fusion mechanism to move. The transmission tooth plate is movably connected in the adjustment locking mechanism, and the adjustment locking mechanism is adjusted to make the transmission tooth plate move, thereby driving the spinal fusion mechanism to move. The two transmission tooth plates are connected to each other through a supporting mechanism, and the transmission tooth plates are supported and limited by the supporting mechanism, and the two transmission tooth plates are pulled inward at the same time.

[0010] Preferably, the spinal fusion mechanism includes a vertebral plate, wherein the end of the vertebral plate away from the hyperbolic pad is fixedly connected to a porous implant block, the end of the vertebral plate close to the hyperbolic pad is fixedly connected to an arc-shaped guide block, the end of the arc-shaped guide block away from the porous implant block is fixedly connected to a guide block, connecting holes are provided at both ends of the guide block, and clamping holes are provided at both ends of the vertebral plate, and the clamping rod is clamped in the clamping hole.

[0011] Preferably, the vertebral plate and the arc-shaped guide block are made of pure zirconium or zirconium alloy, the porous implant block is made of tantalum or titanium, the porous implant block is arranged in a cross shape, and a plurality of holes with a depth of 0.2-0.8 mm and a porosity of 40-80% are opened on the outside of the porous implant block, and the surface of the vertebral plate, the arc-shaped guide block and the porous implant block is provided with a high-hardness ceramic layer with a thickness of 5-30 μm.

[0012] Preferably, the material of the hyperbolic liner is polyethylene.

[0013] Preferably, the support mechanism includes two support connecting rods, and the opposite ends of the two support connecting rods are respectively movably connected in a sliding cavity, the sliding cavity is opened in the connecting block, and a first spring is sleeved on the outer side of the support connecting rod, one end of the first spring is fixedly connected to the sliding cavity, and the other end is fixedly connected to the support connecting rod.

[0014] Preferably, the adjustment locking mechanism includes a connecting plate, a gear tube is movably connected to the connecting plate, a square protrusion is fixedly connected to the inner side of the gear tube, the opposite ends of the two transmission tooth plates extend into the connecting plate and mesh with the gear tube, a connecting shaft is provided in the gear tube, one end of the connecting shaft extends into the cavity and is connected to the circular plate, and the other end extends into the guide cavity, the circular plate is slidably connected to the cavity, the guide cavity is opened in the connecting plate, the cavity is opened in one end of the connecting plate and is connected to the external environment, a square ring is fixedly sleeved on the outer side of the connecting shaft, the square ring is arranged in the gear tube, and a square block is fixedly connected to the end of the connecting shaft away from the circular plate, and the square block is arranged in the guide cavity.

[0015] Preferably, the circular plate is movably connected to one end of the connecting shaft with two limit rods, and the circular plate is fixedly connected to one end away from the connecting shaft with two limit blocks, the limit blocks are clamped in the limit holes, and a plurality of limit holes are provided in the cavity near one end of the limit blocks. A second spring is sleeved on the outside of the connecting shaft, one end of the second spring is in contact with the circular plate, and the other end is fixedly connected to the cavity, and a cross groove is provided in one end of the circular plate near the limit block.

[0016] Preferably, the guide cavity is in contact with the connecting gear away from one end of the gear tube, and the connecting gear is movably connected to the connecting plate. A guide tooth plate is meshed on the outer side of the connecting gear, and one end of the guide tooth plate is fixedly connected to the U-shaped clamping rod, and the U-shaped clamping rod is slidably connected to the guide cavity. The guide cavity is opened in the connecting plate, and both ends of the U-shaped clamping rod extend into the external environment. A support spring is fixedly connected in the guide cavity, and the other end of the support spring is fixedly connected to the U-shaped clamping rod. A plurality of sockets are opened in one end of the gear tube near the circular plate, a plurality of limiting through holes are opened in the cavity near one end of the gear tube, and a square socket is opened in one end of the connecting gear near the connecting shaft.

[0017] Preferably, the positioning mechanism includes a positioning rod, which is movably connected in the hyperbolic liner, and a square limit block is fixedly sleeved on the outer side of the positioning rod, and the square limit block is slidably connected in the connecting cavity, and the connecting cavity is opened in the hyperbolic liner. An internal threaded hole is opened in one side of the square limit block, and a plurality of through holes are opened in the outer side of the hyperbolic liner, and a plurality of the through holes are connected to the corresponding connecting cavities.

[0018] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a preparation method for the above-mentioned hyperbolic dual-motion intervertebral fusion cage, comprising:

[0019] S1. Use software to perform three-dimensional structural design and processing drawing design on the hyperbolic dual-motion intervertebral fusion device, use precision machining methods to select high-cross-linked polyethylene sheets to process hyperbolic liners for standby use, use precision machining methods and mechanical polishing methods to select zirconium alloy sheets for processing, and obtain vertebral plates, arc blocks and guide blocks connected together;

[0020] S2. Design a tooling that can fix the vertebral plate, arc block and guide block on a plane and prepare them by mechanical processing method. Fix the vertebral plate, arc block and guide block on the platform of the 3D printing machine after matching with the tooling fixture. Use the three-dimensional contour structure characteristics and infrared laser to identify and mark the specific position information of the vertebral plate, arc block and guide block that have been fixed on the 3D printing platform. Add pure tantalum powder to the 3D printer, use laser 3D printing technology to perform precision molding on the upper plane of the vertebral plate, and manufacture the structure of the porous implant block;

[0021] S3. After printing is completed, take it out, clean it, and reassemble it with the fixture. At this time, the tooling fixture will assemble and protect the porous implant block at the upper end of the vertebral plate, and seal the assembly gap, put it into a furnace with controllable pressure and temperature for high-temperature treatment, inject a certain amount of oxygen and protective gas into the furnace, and take it out after high-temperature treatment.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: by clamping the spinal fusion mechanism between two sets of transmission tooth plates, and by using an adjusting locking mechanism to make the two spinal fusion mechanisms contact each other, the two spinal fusion mechanisms are arranged between the vertebrae through an incision, and after the two spinal fusion mechanisms are propped up by using the adjusting locking mechanism, a hyperbolic pad is arranged between the two spinal fusion mechanisms, and the spinal fusion mechanism and the hyperbolic pad are connected together by using the adjusting locking mechanism, thereby solving the problem of needing to open an incision on the patient's body that is larger than the size of the fusion device in order to install the fusion device, and the installation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the side section structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the connecting plate of the present invention;

[0026] Figure 4 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0027] Figure 5 This is a schematic diagram of the cross-sectional structure of the connecting block of the present invention;

[0028] Figure 6 It is a cross-sectional structural schematic diagram of the connection relationship between the U-shaped clamping rod and the guide tooth plate of the present invention;

[0029] Figure 7 It is a schematic diagram of the cross-sectional structure of the hyperbolic liner of the present invention;

[0030] Figure 8 It is a three-dimensional structural schematic diagram of the connection relationship between the circular plate and the connecting shaft of the present invention;

[0031] Fig. 9 It is a three-dimensional structural schematic diagram of the connection relationship between the transmission gear plate and the connecting plate of the present invention;

[0032] Fig.10 This is a schematic diagram of the main structure of the connection relationship between the vertebral plate and the hyperbolic liner of the present invention;

[0033] Fig.11 It is a cross-sectional structural schematic diagram of the connection relationship between the vertebral plate and the hyperbolic liner of the present invention;

[0034] Fig.12 It is a side view structural schematic diagram of the connection relationship between the vertebral plate and the hyperbolic liner of the present invention;

[0035] Fig.13 It is a schematic diagram of the structure of the porous implant block of the present invention in the installed state.

[0036] In the figure: 1, vertebral plate; 2, porous implant block; 3, arc-shaped guide block; 4, guide block; 5, through hole; 6, hyperbolic liner; 7, guide groove; 8, connecting hole; 9, U-shaped clamping rod; 10, clamping hole; 11, connecting shaft; 12, supporting connecting rod; 13, transmission gear plate; 14, gear tube; 15, cavity; 16, sliding cavity; 17, connecting cavity; 18, connecting plate; 19, clamping rod; 20, connecting block; 21, square block; 22. Positioning rod; 23. Connecting gear; 24. Limiting through hole; 25. Limiting rod; 26. Round plate; 27. Limiting hole; 28. Limiting block; 29. ​​Second spring; 30. Socket; 31. Guide tooth plate; 32. Guide cavity; 33. Support spring; 34. Guide cavity; 35. Square protrusion; 36. Square ring; 37. Square limiting block; 38. Cross groove; 39. First spring; 40. Internal threaded hole; 41. Square socket. DETAILED DESCRIPTION

[0037] 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.

[0038] See also Figure 1-13 , the present invention provides a technical solution:

[0039] Embodiment 1: A hyperbolic double-action intervertebral fusion device, comprising two spinal fusion mechanisms, a hyperbolic pad 6 is arranged between the two spinal fusion mechanisms, guide grooves 7 are provided in the upper and lower ends of the hyperbolic pad 6, one end of the spinal fusion mechanism close to the hyperbolic pad 6 is movably connected to the guide groove 7, the upper and lower ends of the hyperbolic pad 6 are arranged in an arc shape, the end of the spinal fusion mechanism away from the hyperbolic pad 6 is fused into the spine, and the two spinal fusion mechanisms slide along the hyperbolic pad 6 to achieve the freedom of a normal flexible intervertebral disc. The structure is a movable structure, which can obtain the freedom of a normal flexible intervertebral disc, which has great benefits for the posture and movement recovery of the patient after implantation, and the free hyperbolic pad can be easily replaced in case of sudden accidents or after wear over time, reducing the difficulty of surgical repair;

[0040] Both ends of the two spinal fusion mechanisms are provided with a transmission tooth plate 13, and the transmission tooth plate 13 is fixedly connected with a clamping rod 19 on one side close to the vertebral plate 1. The clamping rod 19 is clamped in the spinal fusion mechanism. The clamping rod 19 is clamped in the spinal fusion mechanism, so that the transmission tooth plate 13 can drive the spinal fusion mechanism to move when it moves. The transmission tooth plate 13 is movably connected in the adjustment locking mechanism. By adjusting the adjustment locking mechanism, the transmission tooth plate 13 is moved, and then the vertebral plate 1 is driven to move. The two transmission tooth plates 13 are connected to each other through a supporting mechanism, and the transmission tooth plates 13 are supported and limited by the supporting mechanism. At the same time, the two transmission tooth plates 13 are pulled inward. A plurality of positioning mechanisms are provided in the hyperbolic liner 6. After the lower end of the spinal fusion mechanism is driven to enter the guide groove 7 by the adjustment locking mechanism, the adjustment locking mechanism is continued to be adjusted so that the positioning mechanism enters the guide groove 7 and is clamped in the spinal fusion mechanism, so that the lower end of the spinal fusion mechanism is limited in the guide groove 7.

[0041] Embodiment 2: Based on Embodiment 1, in order to prevent the two groups of vertebral plates 1 from moving downward under the pressure of the vertebrae after being supported, Fig.11As shown, the spinal fusion mechanism includes a vertebral plate 1, wherein the end of the vertebral plate 1 away from the hyperbolic pad 6 is fixedly connected to a porous implant block 2, the end of the vertebral plate 1 close to the hyperbolic pad 6 is fixedly connected to an arc-shaped guide block 3, the end of the arc-shaped guide block 3 away from the porous implant block 2 is fixedly connected to a guide block 4, both ends of the guide block 4 are provided with connecting holes 8, both ends of the vertebral plate 1 are provided with clamping holes 10, and the clamping rod 19 is clamped in the clamping holes 10. By clamping the porous implant block 2 into the vertebra, when the vertebra moves, since the upper and lower ends of the hyperbolic pad 6 are arranged in an arc shape, the arc-shaped guide block 3 will move along the surface of the hyperbolic pad 6, and the guide block 4 will start to rotate along the guide groove 7, and the vertebral plate 1 and the arc-shaped guide block 3 will move along the surface of the hyperbolic pad 6. The material of the porous implant block 2 is pure zirconium or zirconium alloy, preferably zirconium-niobium, zirconium-tantalum, zirconium-cobalt alloy, the material of the porous implant block 2 is tantalum or titanium, preferably pure tantalum, TC4 titanium alloy, the pure titanium porous implant block 2 is cross-shaped, and a plurality of holes with a depth of 0.2-0.8mm and a porosity of 40-80% are opened on the outer side of the porous implant block 2. The contact surface between the porous implant block 2 and the bone is pure tantalum, which has a good bone induction effect. At the same time, the holes set in the porous implant block 2 can achieve bone growth better and faster, reducing the occurrence of complications. The surface of the vertebral plate 1, the arc-shaped guide block 3 and the porous implant block 2 is provided with a high-hardness ceramic layer with a thickness of 5-30μm, and the material of the hyperbolic liner 6 is polyethylene;

[0042] like Figure 1 , Figure 5 As shown, the support mechanism includes two support connecting rods 12, and the opposite ends of the two support connecting rods 12 are movably connected to the sliding cavity 16 respectively. The sliding cavity 16 is opened in the connecting block 20. A first spring 39 is sleeved on the outer side of the support connecting rod 12, and one end of the first spring 39 is fixedly connected to the sliding cavity 16, and the other end is fixedly connected to the support connecting rod 12, so that the two vertebral plates 1 are clamped between the corresponding two transmission tooth plates 13. Specifically, the two connecting plates 18 are pushed outward to drive the four transmission tooth plates 13 to move outward, and the movement of the transmission tooth plates 13 drives the support connecting rods 12 connected thereto to move. At this time, the first spring 39 is compressed, and the two groups of vertebral plates 1 are placed between the two groups of transmission tooth plates 13. The pushing of the connecting plates 18 is released. At this time, under the elastic force of the first spring 39, the two groups of transmission tooth plates 13 will move inward and drive the clamping rod 19 to be clamped into the corresponding clamping hole 10. At this time, the connection between the vertebral plate 1 and the transmission tooth plate 13 is completed;

[0043] like Figure 2 , Figure 3 , Figure 4As shown, the adjustment locking mechanism includes a connecting plate 18, in which a gear tube 14 is movably connected, and a square protrusion 35 is fixedly connected to the inner side of the gear tube 14. The opposite ends of the two transmission tooth plates 13 are extended into the connecting plate 18 and meshed with the gear tube 14. The connecting shaft 11 can be driven to start rotating by rotating the circular plate 26 by a tool, and the rotation of the connecting shaft 11 causes the gear tube 14 to rotate. Since the two sets of transmission tooth plates 13 are meshed with the gear tube 14, during the rotation of the gear tube 14, the two sets of transmission tooth plates 13 will also move inward or outward accordingly. The connecting shaft 11 is provided in the gear tube 14. , one end of the connecting shaft 11 extends into the cavity 15 and is connected to the circular plate 26, and the other end extends into the guide cavity 32, the circular plate 26 is slidably connected to the cavity 15, the guide cavity 32 is opened in the connecting plate 18, the cavity 15 is opened in one end of the connecting plate 18 and is connected to the external environment, the tool can be inserted into the cross groove 38 through the cavity 15, and the circular plate 26 is driven to start rotating, the outer side of the connecting shaft 11 is fixedly sleeved with a square ring 36, the square ring 36 is arranged in the gear tube 14, and the end of the connecting shaft 11 away from the circular plate 26 is fixedly connected with a square block 21, and the square block 21 is arranged in the guide cavity 32;

[0044] The circular plate 26 is movably connected to one end of the connecting shaft 11 with two limit rods 25, and the circular plate 26 is fixedly connected to one end of the connecting shaft 11 with two limit blocks 28. The limit blocks 28 are clamped in the limit holes 27. The cavity 15 is provided with a plurality of limit holes 27 in one end of the connecting shaft 11. A second spring 29 is sleeved on the outer side of the connecting shaft 11. One end of the second spring 29 contacts the circular plate 26, and the other end is fixedly connected to the cavity 15. A cross groove 3 is provided in one end of the circular plate 26 close to the limit block 28. 8. Insert the tool into the cross groove 38 and press the circular plate 26 downward, so that the limit block 28 is disengaged from the limit hole 27. Since the square ring 36 is slidably connected to the square protrusion 35, the circular plate 26 can be rotated by the tool to drive the connecting shaft 11 to start rotating. The rotation of the connecting shaft 11 causes the gear tube 14 to rotate. Since the two sets of transmission tooth plates 13 are meshed with the gear tube 14, during the rotation of the gear tube 14, the two sets of transmission tooth plates 13 will also move inward or outward accordingly;

[0045] like Figure 2 , Figure 5As shown, the guide cavity 32 is away from the end of the gear tube 14 and contacts with the connecting gear 23. The connecting gear 23 is movably connected to the connecting plate 18. A guide tooth plate 31 is meshed on the outer side of the connecting gear 23. One end of the guide tooth plate 31 is fixedly connected to the U-shaped clamping rod 9. The U-shaped clamping rod 9 is slidably connected to the guide cavity 34. The guide cavity 34 is opened in the connecting plate 18. Both ends of the U-shaped clamping rod 9 extend into the external environment. Since the square block 21 is inserted into the square plug hole 41, when the connecting shaft 11 rotates, the connecting gear 23 will also rotate accordingly. The rotation of the connecting gear 23 drives the guide tooth plate 31 to start moving. The movement of the guide tooth plate 31 drives the U-shaped clamping rod 9 to move. A support spring 33 is fixedly connected in the guide cavity 34. The other end of the support spring 33 is fixedly connected to the U-shaped clamping rod 9. Under the elastic force of the support spring 33, the U-shaped clamping rod 9 will not move outward when the connecting shaft 11 does not rotate.

[0046] The gear tube 14 is provided with a plurality of jacks 30 in one end near the circular plate 26, the cavity 15 is provided with a plurality of limit holes 24 in one end near the gear tube 14, and the connecting gear 23 is provided with a square jack 41 in one end near the connecting shaft 11. When the limit rod 25 passes through the limit hole 24 and is plugged into the jack 30, the limit rod 25 will limit the gear tube 14. At the same time, when the circular plate 26 rotates, the limit rod 25 will also start to move along the circular plate 26. The positioning mechanism includes a positioning rod 22, which is movably connected to the hyperbolic liner 6. The positioning rod 22 is externally connected to the hyperbolic liner 6. A square limit block 37 is fixedly sleeved on the side, and the square limit block 37 is slidably connected to the connecting cavity 17. The connecting cavity 17 is opened in the hyperbolic liner 6. An internal threaded hole 40 is opened on one side of the square limit block 37, and a plurality of through holes 5 are opened on the outer side of the hyperbolic liner 6. The plurality of through holes 5 are connected to the corresponding connecting cavity 17. Through the movement of the U-shaped clamping rod 9, one end of the positioning rod 22 is pushed into the connecting hole 8 opened in the guide block 4. After the positioning is completed, the screw is passed through the through hole 5 and screwed into the internal threaded hole 40 to limit the positioning rod 22.

[0047] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a preparation method for the above-mentioned hyperbolic dual-motion intervertebral fusion cage, comprising:

[0048] S1. Use software to design three-dimensional structure and processing drawings, use precision machining method to select high cross-linked polyethylene sheet to process hyperbolic liner 6 for standby, use precision machining method and mechanical polishing method to select zirconium alloy sheet for processing, and obtain vertebral plate 1, arc guide block 3 and guide block 4 connected together;

[0049] S2. Design a tooling that can fix the vertebral plate 1, the arc-shaped guide block 3 and the guide block 4 on a plane and prepare them by mechanical processing method. Fix the vertebral plate 1, the arc-shaped guide block 3 and the guide block 4 on the platform of the 3D printing machine after matching with the tooling fixture. Use the three-dimensional contour structure characteristics and infrared laser to identify and mark the specific position information of the vertebral plate 1, the arc-shaped guide block 3 and the guide block 4 fixed on the 3D printing platform. Add pure tantalum powder to the 3D printer, use laser 3D printing technology to perform precision molding on the upper plane of the vertebral plate, and manufacture the structure of the porous implant block 2;

[0050] S3. After printing is completed, take it out, clean it, and reassemble it with the fixture. At this time, the tooling fixture assembles and protects the porous implant block 2 at the upper end of the vertebral plate 1, and seals the assembly gap. Put it into a furnace with controllable pressure and temperature for high-temperature treatment, inject a certain amount of oxygen and protective gas into the furnace, and take it out after high-temperature treatment.

[0051] Working principle: when in use, the two vertebral plates 1 are clamped between the two corresponding transmission tooth plates 13. Specifically, the two connecting plates 18 are pushed outward to drive the four transmission tooth plates 13 to move outward, and the movement of the transmission tooth plates 13 drives the supporting connecting rods 12 connected thereto to move. At this time, the first spring 39 is compressed, and the two groups of vertebral plates 1 are placed between the two groups of transmission tooth plates 13. The pushing of the connecting plates 18 is released. At this time, under the elastic force of the first spring 39, the two groups of transmission tooth plates 13 will move inward and drive the clamping rods 19 to clamp into the corresponding clamping holes 10. At this time, the connection between the vertebral plates 1 and the transmission tooth plates 13 is completed;

[0052] Insert the tool into the cross groove 38 and press the circular plate 26 downward, so that the limit block 28 is disengaged from the limit hole 27. Since the square ring 36 is slidably connected to the square protrusion 35, the circular plate 26 can be rotated by the tool to drive the connecting shaft 11 to start rotating. The rotation of the connecting shaft 11 causes the gear tube 14 to rotate. Since the two sets of transmission tooth plates 13 are meshed with the gear tube 14, during the rotation of the gear tube 14, the two sets of transmission tooth plates 13 will also move inward or outward accordingly;

[0053] By rotating the two sets of circular plates 26, the two sets of gear tubes 14 are driven to rotate, so that the transmission tooth plate 13 moves inward. Since the clamping rod 19 is clamped in the clamping hole 10, the vertebral plate 1 will move accordingly. When the two sets of guide blocks 4 are in contact with each other, the pressing and rotating of the circular plate 26 is released. Under the elastic force of the second spring 29, the limit block 28 is clamped in the corresponding limit hole 27, so that the circular plate 26 cannot continue to rotate.

[0054] The two groups of vertebral plates 1 are placed between the two groups of vertebrae through the incisions, and the porous implant block 2 is clamped into the groove opened in the vertebrae. After the clamping is completed, the circular plate 26 is pressed and rotated again to move the transmission gear plate 13 outward. At this time, the two vertebral plates 1 move outward and support the vertebrae. After the support is completed, the pressing and rotating of the circular plate 26 is released, and the hyperbolic liner 6 is placed between the two guide blocks 4. After the placement is completed, the circular plate 26 is pressed and rotated again to move the vertebral plates 1 inward, and the two guide blocks 4 enter. After the circular plate 26 is in the corresponding guide groove 7, the rotation of the circular plate 26 is released and the circular plate 26 is continuously pressed downward. At this time, the circular plate 26 moves downward, so that the connecting shaft 11 drives the square ring 36 and the square block 21 to move. When the square block 21 enters the square plug hole 41, the square ring 36 is separated from the square protrusion 35, so that the connecting shaft 11 does not drive the gear tube 14 to rotate when rotating. At the same time, the limiting rod 25 passes through the limiting through hole 24 and is inserted into the plug hole 30 to limit the gear tube 14.

[0055] Rotate the circular plate 26 again to drive the connecting shaft 11 to start rotating. Since the square block 21 is inserted into the square socket 41, the connecting gear 23 will also rotate when the connecting shaft 11 rotates. The rotation of the connecting gear 23 drives the guide tooth plate 31 to start moving. The movement of the guide tooth plate 31 drives the U-shaped clamping rod 9 to move. Through the movement of the U-shaped clamping rod 9, one end of the positioning rod 22 is pushed into the connecting hole 8 opened in the guide block 4. After the positioning is completed, the screw is passed through the through hole 5 and screwed into the internal threaded hole 40 to limit the positioning rod 22. Rotate the circular plate 26 in the opposite direction to make the U-shaped clamping rod 9 return to the initial position. After the transmission tooth plate 13 is pushed outward to make the clamping rod 19 disengage from the clamping hole 10, the transmission tooth plate 13 can be taken out. When the hyperbolic liner 6 needs to be replaced, the vertebral plate 1 is re-supported according to the above method and the new hyperbolic liner 6 is installed.

[0056] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hyperbolic dual-motion intervertebral fusion cage, characterized in that: It comprises two spinal fusion mechanisms, a hyperbolic pad is arranged between the two spinal fusion mechanisms, guide grooves are provided in the upper and lower ends of the hyperbolic pads, one end of the spinal fusion mechanism close to the hyperbolic pad is movably connected in the guide groove, the upper and lower ends of the hyperbolic pad are arranged in an arc shape, the end of the spinal fusion mechanism away from the hyperbolic pad is fused into the spine, and the two spinal fusion mechanisms slide along the hyperbolic pads to achieve the freedom of a normal flexible intervertebral disc; Both ends of the two spinal fusion mechanisms are provided with transmission tooth plates, and a clamping rod is fixedly connected to the transmission tooth plate near the spinal fusion mechanism. The clamping rod is clamped in the spinal fusion mechanism, and the spinal fusion mechanism can be driven to move when the transmission tooth plate moves. The transmission tooth plate is movably connected in the adjustment locking mechanism, and the adjustment locking mechanism is adjusted to make the transmission tooth plate move, thereby driving the spinal fusion mechanism to move. The two transmission tooth plates are connected to each other through a supporting mechanism, and the transmission tooth plates are supported and limited by the supporting mechanism, and the two transmission tooth plates are pulled inward at the same time; The hyperbolic liner is provided with a plurality of positioning mechanisms. After the lower end of the spinal fusion mechanism is driven into the guide groove by adjusting the locking mechanism, the adjusting locking mechanism is continuously adjusted so that the positioning mechanism enters the guide groove and is clamped into the spinal fusion mechanism, so that the lower end of the spinal fusion mechanism is limited in the guide groove. The spinal fusion mechanism comprises a vertebral plate, one end of the vertebral plate away from the hyperbolic pad is fixedly connected to a porous implant block, one end of the vertebral plate close to the hyperbolic pad is fixedly connected to an arc-shaped guide block, and one end of the arc-shaped guide block away from the porous implant block is fixedly connected to a guide block, both ends of the guide block are provided with connection holes, both ends of the vertebral plate are provided with clamping holes, and the clamping rod is clamped in the clamping holes; The adjustment locking mechanism includes a connecting plate, a gear tube is movably connected to the connecting plate, a square protrusion is fixedly connected to the inner side of the gear tube, the opposite ends of the two transmission tooth plates extend into the connecting plate and mesh with the gear tube, a connecting shaft is provided in the gear tube, one end of the connecting shaft extends into the cavity and is connected to the circular plate, and the other end extends into the guide cavity, the circular plate is slidably connected to the cavity, the guide cavity is opened in the connecting plate, the cavity is opened in one end of the connecting plate and is connected to the external environment, a square ring is fixedly sleeved on the outer side of the connecting shaft, the square ring is arranged in the gear tube, and a square block is fixedly connected to the end of the connecting shaft away from the circular plate, and the square block is arranged in the guide cavity.

2. The hyperbolic dual-motion intervertebral fusion cage according to claim 1, characterized in that: The material of the vertebral plate and the arc-shaped guide block is pure zirconium or zirconium alloy, the material of the porous implant block is tantalum or titanium, the porous implant block is arranged in a cross shape, and a plurality of holes with a depth of 0.2-0.8mm and a porosity of 40-80% are opened on the outside of the porous implant block. The surface of the vertebral plate, the arc-shaped guide block and the porous implant block is provided with a high-hardness ceramic layer with a thickness of 5-30μm.

3. The hyperbolic dual-motion intervertebral fusion cage according to claim 1, characterized in that: The material of the hyperbolic liner is polyethylene.

4. The hyperbolic dual-motion intervertebral fusion cage according to claim 1, characterized in that: The support mechanism includes two support connecting rods, and the opposite ends of the two support connecting rods are movably connected in a sliding cavity respectively. The sliding cavity is opened in the connecting block, and a first spring is sleeved on the outer side of the support connecting rod. One end of the first spring is fixedly connected to the sliding cavity, and the other end is fixedly connected to the support connecting rod.

5. The hyperbolic dual-motion intervertebral fusion cage according to claim 1, characterized in that: The circular plate is movably connected to one end of the connecting shaft with two limit rods, and the circular plate is fixedly connected to one end away from the connecting shaft with two limit blocks, the limit blocks are clamped in the limit holes, and a plurality of limit holes are provided in the cavity near one end of the limit blocks. A second spring is sleeved on the outside of the connecting shaft, one end of the second spring is in contact with the circular plate, and the other end is fixedly connected to the cavity, and a cross groove is provided in one end of the circular plate near the limit blocks.

6. The hyperbolic dual-motion intervertebral fusion cage according to claim 5, characterized in that: The guide cavity is in contact with the connecting gear at one end away from the gear tube, and the connecting gear is movably connected to the connecting plate. A guide tooth plate is meshed on the outer side of the connecting gear, and one end of the guide tooth plate is fixedly connected to the U-shaped clamping rod, and the U-shaped clamping rod is slidably connected to the guide cavity. The guide cavity is opened in the connecting plate, and both ends of the U-shaped clamping rod extend into the external environment. A support spring is fixedly connected in the guide cavity, and the other end of the support spring is fixedly connected to the U-shaped clamping rod. A plurality of jacks are opened in one end of the gear tube close to the circular plate, a plurality of limiting through holes are opened in the cavity close to one end of the gear tube, and a square jack is opened in one end of the connecting gear close to the connecting shaft.

7. The hyperbolic dual-motion intervertebral fusion cage according to claim 1, characterized in that: The positioning mechanism includes a positioning rod, which is movably connected to the hyperbolic liner. A square limit block is fixedly sleeved on the outer side of the positioning rod. The square limit block is slidably connected to the connecting cavity. The connecting cavity is opened in the hyperbolic liner. An internal threaded hole is opened on one side of the square limit block. A plurality of through holes are opened on the outer side of the hyperbolic liner. Several of the through holes are connected to the corresponding connecting cavities.

8. A preparation method for the hyperbolic dual-motion intervertebral fusion cage according to any one of claims 1 to 7, characterized in that: include: S1. Use software to perform three-dimensional structural design and processing drawing design on the hyperbolic dual-motion intervertebral fusion device, use precision machining methods to select high-cross-linked polyethylene sheets to process hyperbolic liners for standby use, use precision machining methods and mechanical polishing methods to select zirconium alloy sheets for processing, and obtain vertebral plates, arc blocks and guide blocks connected together; S2. Design a tooling that can fix the vertebral plate, arc block and guide block on a plane and prepare them by mechanical processing method. Fix the vertebral plate, arc block and guide block on the platform of the 3D printing machine after matching with the tooling fixture. Use the three-dimensional contour structure characteristics and infrared laser to identify and mark the specific position information of the vertebral plate, arc block and guide block that have been fixed on the 3D printing platform. Add pure tantalum powder to the 3D printer, use laser 3D printing technology to perform precision molding on the upper plane of the vertebral plate, and manufacture the structure of the porous implant block; S3. After printing is completed, take it out, clean it, and reassemble it with the fixture. At this time, the tooling fixture will assemble and protect the porous implant block at the upper end of the vertebral plate, and seal the assembly gap. Put it into a furnace with controlled pressure and temperature for high-temperature treatment, inject a certain amount of oxygen and protective gas into the furnace, and take it out after high-temperature treatment.

Images