Vertebral prosthesis

Abstract

The invention provides a centrum prosthesis which comprises a cylinder, a first screw and a second screw, and two ends of the cylinder are open; the first plate body is arranged at the first end of the cylinder body; the connecting block is fixedly arranged in the cylinder body, and an avoiding hole is formed in the side, away from the first plate body, of the connecting block; the second plate body is arranged at the second end of the cylinder body; the connecting rod is connected with the second plate body, and the connecting rod can penetrate into the avoiding hole; the limiting piece is adjustably arranged on the connecting rod, and the limiting piece can be matched with the connecting block in an abutting mode; and the first elastic piece is arranged on the connecting rod in a sleeving manner, and the first elastic piece is arranged between the second plate body and the limiting piece in a compressed manner. According to the technical scheme, the problem that stress shielding is likely to be generated due to the fact that a vertebral prosthesis makes rigid contact with the adjacent vertebral body in the related technology is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a vertebral prosthesis. Background Art

[0002] Vertebral prostheses are used to replace vertebrae that have lost function due to disease or injury. Traditional vertebral prosthesis designs often focus on structural stability and biocompatibility, but they have significant limitations in their ability to be highly adjustable and adapt to different patient anatomy.

[0003] In related technologies, vertebral prostheses mostly adopt an integrally formed structure, that is, the first plate and the second plate are directly connected, lacking an effective adjustment mechanism. Although this fixed-structure vertebral prosthesis can provide structural support to a certain extent, due to differences in the implanted individuals, the physiological characteristics of each person's vertebra will vary to a certain extent. Therefore, after implantation, due to the overall fixed structure of the vertebral prosthesis, the implanted vertebral prosthesis will be in rigid contact with the two adjacent vertebrae, which can easily cause stress shielding and affect the growth of bone tissue. Summary of the Invention

[0004] The main purpose of the present invention is to provide a vertebral prosthesis to solve the problem in the related art that the vertebral prosthesis is in rigid contact with the adjacent vertebrae, thereby easily generating stress shielding.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a vertebral prosthesis, comprising: a cylinder, with both ends of the cylinder open; a first plate, arranged at the first end of the cylinder; a connecting block, fixedly arranged inside the cylinder, and a side of the connecting block away from the first plate is provided with an avoidance hole; a second plate is arranged at the second end of the cylinder; a connecting rod, connected to the second plate, and the connecting rod can be passed through the avoidance hole; a limit member, adjustably arranged on the connecting rod, and the limit member can abut and cooperate with the connecting block; a first elastic member, sleeved on the connecting rod, and the first elastic member is compressively arranged between the second plate and the limit member.

[0006] Furthermore, a guide groove is provided on the second plate body, and the guide groove is provided along the length direction of the cylinder body. A guide piece is provided on the inner wall of the cylinder body, and the guide piece is inserted into the guide groove.

[0007] Furthermore, both ends of the guide groove are closed.

[0008] Furthermore, the connecting rod is a screw rod, the limiting member is a bolt, and / or, there are multiple connecting rods, there are multiple first elastic members and they are arranged one-to-one corresponding to the multiple connecting rods, and there are multiple limiting members and they are arranged one-to-one corresponding to the multiple connecting rods.

[0009] Furthermore, the vertebral prosthesis further includes an adjusting component, which is disposed between the first plate and the connecting block and is capable of adjusting the inclination angle of the first plate.

[0010] Furthermore, the adjustment assembly includes multiple lifting mechanisms, which are arranged in an array. Each lifting mechanism includes a lifting rod, the first end of the lifting rod is hingedly connected to the first plate body through a hinge shaft, the axes of the multiple hinge shafts are arranged in parallel, and the second end of each lifting mechanism rod is guided and matched with the connecting block.

[0011] Furthermore, the lifting rod is a gear condition, the lifting mechanism also includes a gear shaft and a locking piece, the adjusting assembly also includes a rod body arranged on the side of the connecting block facing the gear condition, the first end of the gear condition is hingedly connected to the first plate body, and the second end of the gear condition is provided with a connecting hole, which extends along the length direction of the gear condition, and the end of the rod body away from the connecting block is inserted into the connecting hole, the gear shaft is passed through the cylinder and meshed with the gear condition, and the locking piece is arranged between the gear shaft and the cylinder to limit the rotation of the gear shaft.

[0012] Furthermore, a first mounting hole is provided inside the gear shaft, a first limiting surface is provided on the hole wall of the first mounting hole, a second mounting hole is provided on the cylinder body, a second limiting surface is provided on the hole wall of the second mounting hole, the locking member includes a locking block and a second elastic member, the first end of the second elastic member is connected to the bottom wall of the second mounting hole, the second end of the second elastic member is connected to the locking block, the locking block has a locking position and an unlocking position, when the locking block is in the locking position, the locking block is limitedly matched with the first limiting surface and the second limiting surface to prevent the gear shaft from rotating, when the locking block is in the unlocking position, the locking hole is located in the second mounting hole and on the outside of the first limiting surface.

[0013] Furthermore, an operating hole is provided on the cylinder body, and the operating hole is provided corresponding to the first mounting hole.

[0014] Furthermore, the vertebral prosthesis further includes a first drug-carrying structure and a second drug-carrying structure. The first drug-carrying structure is arranged on a side of the first plate away from the second plate, and the second drug-carrying structure is arranged on a side of the second plate away from the first plate.

[0015] Furthermore, the first drug carrying structure includes a first drug carrying body and a first spike portion, the first spike portion is arranged on a side of the first drug carrying body facing away from the first plate body, and a plurality of first release holes are arranged on a surface of the first drug carrying body away from the first plate body, and the areas of the plurality of first release holes gradually increase from the center to the periphery of the first drug carrying body; and / or, the second drug carrying structure includes a second drug carrying body and a second spike portion, the second spike portion is arranged on a side of the second drug carrying body facing away from the second plate body, and a plurality of second release holes are arranged on a surface of the second drug carrying body away from the second plate body, and the areas of the plurality of second release holes gradually increase from the center to the periphery of the second drug carrying body.

[0016] According to the technical solution of the present invention, the first plate and the second plate are respectively arranged at the first end and the second end of the cylinder, the connecting block is arranged inside the cylinder, and the connecting rod is connected to the second plate and can be passed through the avoidance hole on the connecting block. The limiter and the first elastic member are both arranged on the connecting rod, the limiter can compress the first elastic member and the limiter can abut against the connecting block. Through the above-mentioned arrangement, by adjusting the compression amount of the first elastic member, the size between the first plate and the second plate can be adjusted, that is, by adjusting the preload force of the first elastic member, the elastic modulus of the vertebral prosthesis can be flexibly set, so that the vertebral prosthesis can be closer to the physiological characteristics of the human vertebra, thereby avoiding the stress shielding effect and promoting the growth and recovery of bone tissue. Therefore, the technical solution of the present application effectively solves the problem in the related art that the vertebral prosthesis is in hard contact with the adjacent vertebra and thus easily produces stress shielding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a vertebral prosthesis according to the present invention is shown;

[0019] Figure 2 Shown Figure 1 Schematic cross-sectional view of a vertebral prosthesis;

[0020] Figure 3 Shown Figure 1 Schematic diagram of the exploded structure of the vertebral prosthesis;

[0021] Figure 4 Shown Figure 1 Schematic diagram of the exploded structure of part of the vertebral prosthesis;

[0022] Figure 5 Shown Figure 4 A schematic diagram of the three-dimensional structure of the first plate body, the second plate body, the connecting block and the adjustment assembly;

[0023] Figure 6 Shown Figure 5 A schematic front view of the first plate body, the second plate body, the connecting block and the adjustment assembly;

[0024] Figure 7 Shown Figure 5 A cross-sectional schematic diagram of the first plate body, the second plate body, the connecting block and the adjusting assembly;

[0025] Figure 8 Shown Figure 1 Schematic diagram of the three-dimensional structure of the first drug-carrying structure.

[0026] The above drawings include the following reference numerals:

[0027] 10. Cylinder; 11. Guide member; 12. Second mounting hole; 13. Operating hole; 20. First plate; 30. Connecting block; 31. Avoidance hole; 40. Second plate; 41. Guide groove; 50. Connecting rod; 60. Limiting member; 70. First elastic member; 80. Adjusting assembly; 81. Lifting mechanism; 811. Lifting rod; 8111. Connecting hole; 812. Gear shaft; 8121. First mounting hole; 813. Locking member; 8131. Locking block; 8132. Second elastic member; 82. Rod; 91. First drug loading structure; 911. First drug loading body; 912. First spike portion; 92. Second drug loading structure; 921. Second drug loading body; 922. Second spike portion. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying 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 embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. 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.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0031] like Figures 1 to 7 As shown, in this embodiment, the vertebral prosthesis includes: a cylinder 10, a first plate 20, a connecting block 30, a second plate 40, a connecting rod 50, a limiter 60 and a first elastic member 70. Both ends of the cylinder 10 are open. The first plate 20 is arranged at the first end of the cylinder 10. The connecting block 30 is fixedly arranged inside the cylinder 10, and a side of the connecting block 30 away from the first plate 20 is provided with an avoidance hole 31. The second plate 40 is arranged at the second end of the cylinder 10. The connecting rod 50 is connected to the second plate 40, and the connecting rod 50 can be inserted into the avoidance hole 31. The limiter 60 is adjustably arranged on the connecting rod 50, and the limiter 60 can abut and cooperate with the connecting block 30. The first elastic member 70 is sleeved on the connecting rod 50, and the first elastic member 70 is compressively arranged between the second plate 40 and the limiter 60.

[0032] Applying the technical solution of this embodiment, the first plate 20 and the second plate 40 are respectively arranged at the first end and the second end of the cylinder 10, the connecting block 30 is arranged inside the cylinder 10, and the connecting rod 50 is connected to the second plate 40 and can be inserted into the avoidance hole 31 on the connecting block 30. The limiter 60 and the first elastic member 70 are both arranged on the connecting rod 50. The limiter 60 can compress the first elastic member 70 and the limiter 60 can abut against the connecting block 30. Through the above-mentioned arrangement, by adjusting the compression amount of the first elastic member 70, the size between the first plate 20 and the second plate 40 can be adjusted. That is, by adjusting the preload force of the first elastic member 70, the elastic modulus of the vertebral prosthesis can be flexibly set, thereby making the vertebral prosthesis closer to the physiological characteristics of the human vertebra, thereby avoiding the stress shielding effect and promoting the growth and recovery of bone tissue. Therefore, the technical solution of this embodiment effectively solves the problem of rigid contact between the vertebral prosthesis and the adjacent vertebrae in the related art, which is prone to stress shielding.

[0033] Specifically, the technical solution of this embodiment utilizes the interaction between the connecting rod 50, the stopper 60, and the first elastic member 70 to precisely adjust the height of the vertebral prosthesis and improve its stability. After the connecting rod 50 passes through the avoidance hole 31 provided on the side of the connecting block 30 away from the first plate 20 and is connected to the second plate 40, the stopper 60 is adjustably provided on the connecting rod 50 and can abut against the connecting block 30, while the first elastic member 70 is sleeved on the connecting rod 50 and is in a compressed state between the second plate 40 and the stopper 60. This design allows the connecting rod 50 to extend and retract between the first plate 20 and the second plate 40, while the first elastic member 70 generates a restoring force to ensure a close fit between the two. The stopper 60 prevents the second plate 40 from excessive movement, thereby maintaining the height stability of the vertebral prosthesis. Therefore, by adjusting the position of the stopper 60, the distance between the first plate 20 and the second plate 40 can be varied, achieving precise control of the vertebral prosthesis height. Furthermore, the presence of the first elastic member 70 ensures that the vertebral prosthesis maintains its set height even under external forces, thereby improving the stability and adaptability of the entire system. This approach addresses the difficulty in precisely adjusting the height and stability of vertebral prostheses in existing technologies, thereby enhancing the functionality of the vertebral prosthesis and the comfort of the patient after surgery.

[0034] The connecting block 30 is fixedly disposed inside the cylinder 10. After the vertebral prosthesis is implanted, the two vertebrae on the upper and lower sides of the vertebral prosthesis squeeze the vertebral prosthesis, thereby preventing the first plate 20 and the second plate 40 from separating from the cylinder 10. When the first plate 20 or the second plate 40 is subjected to force, the limiting member 60 abuts against the connecting block 30, thereby causing the first elastic member 70 to deform to a certain extent, thereby changing the distance between the first plate 20 and the second plate 40. This prevents the vertebral prosthesis from making hard contact with the two adjacent vertebrae, thereby preventing damage to the two adjacent vertebrae.

[0035] The first elastic member 70 is a spring, and the compression range of the spring is between 0 and 2 mm. The spring is made of medical-grade nickel-titanium alloy, and the elastic modulus is between 3 GPa and 10 GPa, which is close to the elastic modulus range of cancellous bone.

[0036] The number of the first elastic members 70 can be arranged between 6 and 12. By adjusting the compression amount of the spring, the overall elastic modulus of the implant can be changed.

[0037] like Figures 1 to 6As shown, in this embodiment, a guide groove 41 is provided on the second plate 40, and the guide groove 41 is arranged along the length direction of the cylinder 10. A guide member 11 is provided on the inner wall of the cylinder 10, and the guide member 11 is inserted into the guide groove 41. The guide groove 41 is designed on the second plate 40, and is arranged along the length direction of the cylinder 10. The guide member 11 is configured on the inner wall of the cylinder 10, and the guide member 11 is precisely inserted into the guide groove 41. The introduction of this structure makes the movement of the second plate 40 along the length direction of the cylinder 10 smoother and more accurate. The cooperation between the guide groove 41 and the guide member 11 ensures the stability and reliability of the connecting rod 50 and the first elastic member 70 during the adjustment process, avoids deflection and jamming during movement, and thus effectively guarantees the overall assembly accuracy and functional realization of the vertebral prosthesis.

[0038] During the implantation or adjustment of the vertebral prosthesis, the synergistic effect of the guide groove 41 and the guide member 11 ensures precise alignment of the second plate 40, thereby further enhancing the contact between the stopper 60 and the connecting block 30 and improving the stability and safety of the entire prosthesis. Furthermore, this design helps reduce uncertainties during surgical operations, improving surgical efficiency and success rates.

[0039] In other embodiments not shown in the figures, the shape and matching mode of the guide member 11 and the guide groove 41 can be adjusted according to specific needs to adapt to different intervertebral heights and anatomical structure characteristics to ensure personalized customization and precise implantation of the vertebral prosthesis.

[0040] The cylinder 10 is a rectangular cage-shaped structure made of medical-grade titanium alloy. Its shape matches the anatomical structure of the lumbar intervertebral space. It is between 35mm and 60mm long, between 15mm and 30mm wide, and between 10mm and 20mm high.

[0041] like Figures 1 to 6 As shown, in this embodiment, the guide groove 41 is closed at both ends. This design allows the guide groove 41 to form a complete guide path, effectively guiding the relative movement of the guide member 11 between the inner wall of the cylinder 10 and the second plate 40, ensuring a smooth and accurate connection process. The closed guide groove 41 also prevents external impurities from entering the cylinder 10, protecting the internal structure from contamination, thereby ensuring the overall performance and service life of the vertebral prosthesis.

[0042] Furthermore, the design of this enclosed guide groove 41 eliminates the risk of the guide member 11 falling off during assembly, improving production efficiency and product quality. Of course, the enclosed design does not limit the specific shape of the guide groove 41. As long as it can meet the guiding and protective functions, the guide groove 41 can adopt a variety of enclosed structures, such as annular or U-shaped, depending on actual needs and design requirements. The enclosed design of the guide groove 41 further enhances the stability and safety of the vertebral prosthesis during use.

[0043] like Figures 1 to 6 As shown, in this embodiment, the connecting rod 50 is a screw and the stopper 60 is a bolt, and / or there are multiple connecting rods 50, multiple first elastic members 70 are provided in a one-to-one correspondence with the multiple connecting rods 50, and multiple stoppers 60 are provided in a one-to-one correspondence with the multiple connecting rods 50. The connecting rod 50 is designed as a screw and the stopper 60 is correspondingly a bolt. This configuration allows the second plate 40 to be adjusted relative to the cylinder 10. Through the cooperation of the stopper 60 and the connecting block 30, the position of the second plate 40 can be precisely controlled, ensuring that the vertebral prosthesis can adapt to the specific needs of different patients.

[0044] Furthermore, by providing multiple connecting rods 50, the corresponding multiple first elastic members 70 and limit members 60 can provide a more stable and balanced supporting force, making the vertebral prosthesis more reliable when bearing body weight. At the same time, the use of multiple connecting rods 50 can achieve more precise adjustment.

[0045] Specifically, by utilizing a combination of screws and bolts, along with a multi-point adjustment design, this embodiment allows for fine-tuning of the vertebral prosthesis' position after installation, ensuring optimal alignment between the prosthesis and the patient's vertebral body. This reduces postoperative complications, improves surgical success rates, and enhances patient comfort. The provision of the first elastic member 70 partially absorbs load, mitigating impact during movement, extending the prosthesis's service life, and providing a more natural spinal motion experience for the patient. Through these optimized design details, the vertebral prosthesis of this embodiment demonstrates enhanced adaptability and durability in surgical applications.

[0046] like Figures 2 to 7 As shown, in this embodiment, the vertebral prosthesis also includes an adjustment assembly 80, disposed between the first plate 20 and the connecting block 30. The adjustment assembly 80 is capable of adjusting the inclination angle of the first plate 20. By configuring the adjustment assembly 80, the vertebral prosthesis can adapt to the physiological curvature and injury conditions of different patients' vertebrae, providing personalized support and correction. This adjustable feature allows the first plate 20 to adjust its angle with the connecting block 30 as needed, thereby better matching the intervertebral disc space and ensuring stability and comfort after implantation.

[0047] The adjustment component 80 not only enhances the scope of application of the vertebral prosthesis, but also improves the accuracy and success rate of the surgery, providing patients with a safer and more effective treatment plan.

[0048] In other embodiments, the adjustment assembly 80 can also employ different structures and operating methods to achieve more precise and convenient angle adjustment, meeting more complex and personalized needs. The design of the adjustment assembly 80 allows the vertebral prosthesis to better adapt to the anatomy of the intervertebral disc during implantation, ensuring optimal postoperative recovery and functional restoration. Through this adjustable mechanism, the vertebral prosthesis not only provides stable support but also promotes natural vertebral healing to a certain extent, reducing complications and improving the patient's quality of life.

[0049] Specifically, the above adjustment range is between 0 and 3 mm, that is, the maximum distance between the first plate body 20 and the cylinder body 10 is 3 mm.

[0050] like Figures 2 to 7 As shown, in this embodiment, the adjustment assembly 80 includes multiple lifting mechanisms 81 arranged in an array. Each lifting mechanism 81 includes a lifting rod 811. The first end of the lifting rod 811 is hingedly connected to the first plate 20 via a hinge axis. The axes of the multiple hinge axes are arranged in parallel. The second end of the rod of each lifting mechanism 81 is guided and engaged with the connecting block 30. This design enables the adjustment assembly 80 to precisely control the tilt angle of the first plate 20. By adjusting the telescopic length of the lifting rod 811 of each lifting mechanism 81, the height of the first plate 20 can be independently adjusted at different positions, thereby achieving fine-tuning of the overall shape of the vertebral prosthesis.

[0051] This multi-point support and adjustment approach can more effectively adapt to the spinal anatomy of different patients, improving comfort and biocompatibility after surgical implantation. Furthermore, the coordinated mechanism between the articulated shaft and the lifting rod 811 ensures the stability of the first plate 20 during adjustment, preventing implant position shifting due to excessive movement or instability, thereby increasing the safety and success rate of the procedure.

[0052] like Figures 2 to 7As shown, in this embodiment, the lifting rod 811 is a gear, the lifting mechanism 81 also includes a gear shaft 812 and a locking member 813, and the adjustment assembly 80 also includes a rod body 82 arranged on the side of the connecting block 30 facing the gear. The first end of the gear is hingedly connected to the first plate 20, and the second end of the gear is provided with a connecting hole 8111, which extends along the length of the gear. The end of the rod 82 away from the connecting block 30 is inserted into the connecting hole 8111. The gear shaft 812 is provided on the cylinder 10 and meshes with the gear. The locking member 813 is provided between the gear shaft 812 and the cylinder 10 to limit the rotation of the gear shaft 812. The lifting rod 811 is designed as a gear, and the lifting mechanism 81 also includes a gear shaft 812 and a locking member 813. At the same time, the adjustment assembly 80 integrates the rod body 82, which is provided on the side of the connecting block 30 facing the gear. The gear member is hingedly connected to the first plate 20 via a hinge axis. The other end of the gear member is provided with a connecting hole 8111 extending along its length. The end of the rod 82 precisely inserts into this connecting hole 8111, forming a stable guide fit. The gear shaft 812 not only penetrates the barrel 10 but also meshes with the gear member. Adjusting the position of the gear shaft 812 effectively changes the gear member's state, thereby affecting the tilt angle of the first plate 20.

[0053] To prevent the gear shaft 812 from rotating freely, a locking member 813 is positioned between the gear shaft 812 and the barrel 10. This design ensures that once the tilt angle of the first plate 20 is set, that setting is reliably maintained, preventing unexpected changes due to external forces during surgery or after implantation, thereby ensuring surgical safety and the functional stability of the vertebral prosthesis. The precise positioning and locking function of the locking member 813 allow the entire vertebral prosthesis to be fine-tuned according to the patient's specific needs and surgical environment, enhancing its adaptability and the potential for personalized treatment. When the locking member 813 is in the locked position, it forms an effective retaining engagement with the first retaining surface of the gear shaft 812 and the second retaining surface of the barrel 10, preventing the gear shaft 812 from rotating and thus fixing the tilt angle of the first plate 20. In the unlocked position, the locking member 813 does not interfere with the first retaining surface of the gear shaft 812, allowing the gear shaft 812 to rotate freely, thereby adjusting the angle of the first plate 20. This design ensures flexibility when adjustments are needed and stability after adjustment.

[0054] Specifically, in this embodiment, there are four racks: a first rack, a second rack, a third rack, and a fourth rack. The second and third racks are located between the first and second racks, and a plane passing through the axes of the first and fourth racks is perpendicular to a plane passing through the axes of the second and third racks. In other words, the first, second, third, and fourth racks are arranged in a diamond pattern. There are four gear shafts 812, and these four gear shafts correspond to the four racks.

[0055] like Figures 2 to 7 As shown, in this embodiment, a first mounting hole 8121 is provided inside the gear shaft 812, and a first limiting surface is provided on the hole wall of the first mounting hole 8121. A second mounting hole 12 is provided on the cylinder 10, and a second limiting surface is provided on the hole wall of the second mounting hole 12. The locking member 813 includes a locking block 8131 and a second elastic member 8132. The first end of the second elastic member 8132 is connected to the bottom wall of the second mounting hole 12, and the second end of the second elastic member 8132 is connected to the locking block 8131. The locking block 8131 has a locked position and an unlocked position. When the locking block 8131 is in the locked position, the locking block 8131 is limitedly engaged with both the first limiting surface and the second limiting surface to prevent the gear shaft 812 from rotating. When the locking block 8131 is in the unlocked position, the locking block 8131 is located in the second mounting hole 12 and outside the first limiting surface. The design of the locking block 8131 cooperating with the first limiting surface and the second limiting surface realizes the locking and unlocking functions of the gear shaft 812.

[0056] Specifically, the locking block 8131 is movable between a locked position and an unlocked position. When in the locked position, the locking block 8131 simultaneously contacts a first limiting surface on the wall of the first mounting hole 8121 and a second limiting surface on the wall of the second mounting hole 12, forming a stable limiting structure that effectively prevents the rotation of the gear shaft 812, thereby fixing the position of the gear condition and ensuring that the adjustment assembly 80 locks the tilt angle of the first plate 20. When the locking block 8131 is in the unlocked position, it is located within the second mounting hole 12 and outside the first limiting surface. At this time, the gear shaft 812 can rotate freely, allowing the gear condition to be adjusted, and thus the tilt angle of the first plate 20. The provision of the second elastic member 8132 can automatically cause the locking block 8131 to return to the locked position, ensuring that the gear shaft 812 is self-locking in the absence of external forces, thereby improving the stability and ease of operation of the adjustment assembly 80. This locking and unlocking mechanism not only ensures the accuracy of the adjustment process, but also provides the function of automatic locking after the adjustment is completed, greatly simplifying the operation process and improving the safety and reliability of vertebral prosthesis in actual application.

[0057] Specifically, in this embodiment, the first mounting hole 8121 is a hexagonal hole, the second mounting hole 12 is a hexagonal hole, and the locking block 8131 is a hexagonal column. In other embodiments, the first mounting hole 8121 can also be a triangular hole, a rectangular block, or other irregularly shaped holes.

[0058] like Figures 2 to 7 As shown, in this embodiment, the barrel 10 is provided with an operating hole 13, which is arranged corresponding to the first mounting hole 8121. This design allows an external tool to be inserted through the operating hole 13 and interact with the gear shaft 812 within the first mounting hole 8121. This configuration not only facilitates adjustment of the position of the gear shaft 812, but also, with the assistance of the locking member 813, allows precise control of the degree of engagement between the gear shaft 812 and the gear member, thereby achieving fine-tuning of the tilt angle of the first plate 20.

[0059] The introduction of the operating hole 13 significantly enhances the operability and flexibility of the vertebral prosthesis adjustment process, ensuring that the surgeon can more conveniently adjust the structural parameters of the vertebral prosthesis during surgery to suit different patient needs and surgical conditions. Furthermore, the adjustment operation performed through the operating hole 13 can also reduce the number of instruments used during surgery, improving surgical efficiency.

[0060] like Figures 1 to 3 as well as Figure 8 As shown, in this embodiment, the vertebral prosthesis further includes a first drug-carrying structure 91 and a second drug-carrying structure 92. The first drug-carrying structure 91 is arranged on the side of the first plate 20 away from the second plate 40, and the second drug-carrying structure 92 is arranged on the side of the second plate 40 away from the first plate 20. The above-mentioned design allows the vertebral prosthesis to release drugs through the first drug-carrying structure 91 and the second drug-carrying structure 92 after implantation to promote the healing of surrounding tissues and reduce the risk of infection. The first drug-carrying structure 91 and the second drug-carrying structure 92 can accommodate different drugs, such as bone growth factors or antibiotics, thereby promoting bone integration and preventing infection at two different interfaces of the vertebral prosthesis. This structure not only improves the biocompatibility and functionality of the vertebral prosthesis, but also can flexibly adjust the drug type and release rate according to specific surgical requirements.

[0061] like Figures 1 to 3 as well as Figure 8As shown, in this embodiment, the first drug carrying structure 91 includes a first drug carrying body 911 and a first spike portion 912, the first spike portion 912 is arranged on the side of the first drug carrying body 911 facing away from the first plate body 20, and a plurality of first release holes are arranged on the surface of the first drug carrying body 911 away from the first plate body 20, and the area of ​​the plurality of first release holes gradually increases from the center to the periphery of the first drug carrying body 911; the second drug carrying structure 92 includes a second drug carrying body 921 and a second spike portion 922, the second spike portion 922 is arranged on the side of the second drug carrying body 921 facing away from the second plate body 40, and a plurality of second release holes are arranged on the surface of the second drug carrying body 921 away from the second plate body 40, and the area of ​​the plurality of second release holes gradually increases from the center to the periphery of the second drug carrying body 921. The first drug-carrying structure 91 comprises a first drug-carrying body 911 and a first spike 912. The first spike 912 is disposed on the side of the first drug-carrying body 911 facing away from the first plate 20. This design allows the first drug-carrying structure 91 to better anchor to the vertebral bone, enhancing biocompatibility and stability. A plurality of first release holes are disposed on the surface of the first drug-carrying body 911 facing away from the first plate 20. The area of ​​these release holes gradually increases from the center to the periphery of the first drug-carrying body 911. This pore size distribution ensures more uniform drug release within the vertebral body, avoiding localized excess or excess drug concentration, and promoting vertebral healing and biointegration. Similarly, the second drug-carrying structure 92 comprises a second drug-carrying body 921 and a second spike 922. The second spike 922 is disposed on the side of the second drug-carrying body 921 facing away from the second plate 40. Similarly, the second drug-carrying body is distributed with second release holes of increasing area, further enhancing drug delivery to both sides of the vertebral prosthesis and ensuring drug utilization efficiency and safety during treatment. Through the above design, the vertebral prosthesis can not only provide mechanical support, but also continuously and evenly release drugs after implantation, promote the growth and repair of bone tissue, and reduce the risk of postoperative infection and complications.

[0062] The first and second drug-carrying structures 91 and 92 utilize minimally shaped surfaces, with curved or gradient pores to increase drug loading and promote slow drug release. This design utilizes the elbow effect to enhance drug retention and release. The pore diameter ranges from 0.5 mm to 1.5 mm, with a depth of 2 mm to 5 mm. The overall layout is densely packed in the center and sparsely packed in the periphery, enabling a gradient release of the drug.

[0063] Specifically, the first medicine carrier body 911 is a first pipe arranged in a curved and coiled manner, and the second medicine carrier body 921 is a second pipe arranged in a curved and coiled manner.

[0064] In this embodiment, the vertebral prosthesis further includes a first porous structure and a second porous structure, wherein the first porous structure is disposed on the first drug-carrying structure 91, and the second porous structure is disposed on the second drug-carrying structure 92. The first spike portion 912 passes through the first porous structure, and the second spike portion 922 passes through the second porous structure.

[0065] The thickness of the first porous structure and the second porous structure is between 3 mm and 5 mm, the pore size is between 0.3 mm and 2 mm, and the porosity is 50% to 90%, which can promote bone tissue growth and vascularization.

[0066] The working process of the vertebral prosthesis in this embodiment is as follows: First, the vertebral prosthesis is in close contact with the upper and lower vertebral surfaces adjacent to the patient's damaged vertebra through the first plate 20 and the second plate 40 to replace the damaged intervertebral disc. Next, the connecting rod 50 is inserted into the avoidance hole 31 and establishes a connection with the second plate 40. At the same time, the first elastic member 70 is compressed and arranged between the second plate 40 and the limit member 60. By adjusting the position of the limit member 60 on the connecting rod 50, the degree of compression of the first elastic member 70 can be changed, and then the relative position of the second plate 40 with respect to the cylinder 10 can be adjusted to achieve fine-tuning of the height of the vertebral prosthesis. During this process, the guide groove 41 on the second plate 40 cooperates with the guide member 11 on the inner wall of the cylinder 10 to ensure that the second plate 40 moves smoothly along the length direction of the cylinder 10, avoiding deviation or jamming during movement.

[0067] In addition, the adjustment assembly 80 is disposed between the first plate 20 and the connecting block 30. By operating the rod 82 and the gear shaft 812, the telescopic length of the lifting rod 811 of the lifting mechanism 81 can be adjusted, thereby changing the tilt angle of the first plate 20 to accommodate individual patient differences and surgical needs. After the operation is completed, the locking block 8131 of the locking member 813 cooperates with the first limiting surface of the first mounting hole 8121 and the second limiting surface of the second mounting hole 12, limiting the rotation of the gear shaft 812 and fixing the tilt angle of the first plate 20. Finally, the first drug-carrying structure 91 and the second drug-carrying structure 92 contact the vertebral tissue on their respective sides facing away from each other, gradually releasing the drug through the multiple release holes provided on their surfaces, promoting healing and reducing the risk of infection.

[0068] In the description of the present invention, it should be understood that "plurality" refers to a quantity of two or more than two. The directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the devices or components referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0069] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0070] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0071] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A vertebral prosthesis, characterized in that: include: A cylinder (10), wherein both ends of the cylinder (10) are open; A first plate (20) is arranged at a first end of the cylinder (10); A connecting block (30) is fixedly arranged inside the cylinder (10), and a side of the connecting block (30) away from the first plate (20) is provided with an avoidance hole (31); A second plate (40) is provided at the second end of the cylinder (10); A connecting rod (50) connected to the second plate (40), wherein the connecting rod (50) can be inserted into the avoidance hole (31); a limiting member (60) adjustably disposed on the connecting rod (50), the limiting member (60) being capable of abutting and cooperating with the connecting block (30); A first elastic member (70) is sleeved on the connecting rod (50), and the first elastic member (70) is compressively arranged between the second plate body (40) and the limiting member (60).

2. The vertebral prosthesis according to claim 1, characterized in that A guide groove (41) is provided on the second plate (40), and the guide groove (41) is provided along the length direction of the cylinder (10). A guide member (11) is provided on the inner wall of the cylinder (10), and the guide member (11) is inserted into the guide groove (41).

3. The vertebral prosthesis according to claim 2, characterized in that Both ends of the guide groove (41) are closed.

4. The vertebral prosthesis according to claim 1, characterized in that The connecting rod (50) is a screw rod, the limiting member (60) is a bolt, and / or the connecting rod (50) is multiple, the first elastic member (70) is multiple and is arranged in a one-to-one correspondence with the multiple connecting rods (50), and the limiting member (60) is multiple and is arranged in a one-to-one correspondence with the multiple connecting rods (50).

5. The vertebral prosthesis according to claim 1, characterized in that The vertebral prosthesis further comprises an adjustment component (80), wherein the adjustment component (80) is arranged between the first plate body (20) and the connecting block (30), and the adjustment component (80) is capable of adjusting the inclination angle of the first plate body (20).

6. The vertebral prosthesis according to claim 5, characterized in that The adjustment assembly (80) includes a plurality of lifting mechanisms (81), and the plurality of lifting mechanisms (81) are arranged in an array. Each of the lifting mechanisms (81) includes a lifting rod (811), and the first end of the lifting rod (811) is hingedly connected to the first plate body (20) through a hinge shaft. The axes of the plurality of hinge shafts are arranged in parallel, and the second end of each lifting mechanism (81) rod is guided and matched with the connecting block (30).

7. The vertebral prosthesis according to claim 6, characterized in that The lifting rod (811) is a gear condition, and the lifting mechanism (81) further includes a gear shaft (812) and a locking member (813). The adjusting assembly (80) further includes a rod body (82) arranged on a side of the connecting block (30) facing the gear condition. The first end of the gear condition is hingedly connected to the first plate body (20), and the second end of the gear condition is provided with a connecting hole (8111). The connecting hole (8111) extends along the length direction of the gear condition. The end of the rod body (82) away from the connecting block (30) is inserted into the connecting hole (8111). The gear shaft (812) is passed through the cylinder (10) and meshed with the gear condition. The locking member (813) is provided between the gear shaft (812) and the cylinder (10) to limit the rotation of the gear shaft (812).

8. The vertebral prosthesis according to claim 7, characterized in that A first mounting hole (8121) is provided inside the gear shaft (812), and a first limiting surface is provided on the hole wall of the first mounting hole (8121). A second mounting hole (12) is provided on the cylinder (10), and a second limiting surface is provided on the hole wall of the second mounting hole (12). The locking member (813) includes a locking block (8131) and a second elastic member (8132). The first end of the second elastic member (8132) is connected to the bottom wall of the second mounting hole (12). The second elastic member (8132) is connected to the bottom wall of the second mounting hole (12). The second end of the locking block (8131) is connected to the locking block (8131), and the locking block (8131) has a locking position and an unlocking position. When the locking block (8131) is in the locking position, the locking block (8131) is limitedly matched with the first limiting surface and the second limiting surface to prevent the gear shaft (812) from rotating. When the locking block (8131) is in the unlocking position, the locking block (8131) is located in the second mounting hole (12) and outside the first limiting surface.

9. The vertebral prosthesis according to claim 8, characterized in that An operating hole (13) is provided on the cylinder (10), and the operating hole (13) is arranged corresponding to the first mounting hole (8121).

10. The vertebral prosthesis according to claim 1, characterized in that The vertebral prosthesis further comprises a first drug-carrying structure (91) and a second drug-carrying structure (92), wherein the first drug-carrying structure (91) is arranged on a side of the first plate body (20) away from the second plate body (40), and the second drug-carrying structure (92) is arranged on a side of the second plate body (40) away from the first plate body (20).

11. The vertebral prosthesis according to claim 10, characterized in that The first drug carrying structure (91) includes a first drug carrying body (911) and a first spike portion (912), the first spike portion (912) is arranged on the side of the first drug carrying body (911) facing away from the first plate body (20), and a plurality of first release holes are arranged on the surface of the first drug carrying body (911) away from the first plate body (20), and the areas of the plurality of first release holes gradually increase from the center to the periphery of the first drug carrying body (911); and / or, the second drug carrying structure (92) includes a second drug carrying body (921) and a second spike portion (922), the second spike portion (922) is arranged on the side of the second drug carrying body (921) facing away from the second plate body (40), and a plurality of second release holes are arranged on the surface of the second drug carrying body (921) away from the second plate body (40), and the areas of the plurality of second release holes gradually increase from the center to the periphery of the second drug carrying body (921).

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