Revision type total ankle joint prosthesis system

Abstract

The invention provides a revision type total ankle joint prosthesis system, and belongs to the field of biomedical engineering. Comprising an ankle joint prosthesis body, the ankle joint prosthesis body comprises a tibia assembly, a talus assembly, a connecting embedded part located between the tibia assembly and the talus assembly and a bone fixing nail, the bone fixing nail is located on the outer walls of the sides, away from the embedded part, of the tibia assembly and the talus assembly, and a limiting assembly for preventing looseness and dislocation is arranged in the bone fixing nail; the tibia assembly comprises a tibia plate, a mounting slot is vertically formed in the side, close to the embedded part, of the tibia plate, and an inserting block connected with the mounting slot in a matched mode is arranged on the outer wall of the side, close to the tibia plate, of the embedded part. According to the ankle joint prosthesis, the tibia plate, the talus plate and the bone fixing nails can be independently installed and replaced, the bone fixing nails are connected in a clamped mode and are matched with the limiting assembly and the bevel gear to drive radial expansion, mechanical interlocking of bone tissue is enhanced, loosening is prevented, and the connection stability is ensured through the fastening design of the anti-loosening annular piece and the threads.

Description

Technical Field

[0001] The present invention relates to the field of biomedical engineering, and more particularly to a revision total ankle joint prosthesis system. Background Art

[0002] The ankle joint is composed of the tibia, the lower end of the fibula, and the talus. The medial malleolus (inside the lower end of the tibia), the lateral malleolus (outside the lower end of the fibula), and the posterior malleolus (back of the lower end of the tibia) together form a fork-like structure that tightly holds the talus in the middle. This constitutes the bony structure of the ankle joint and provides basic stability for the joint.

[0003] When the human ankle joint is injured, diseased, hyperplastic, suffers from ankle bone tumors and congenital deformities, it will cause long-term pain and obstacles in daily life. It is necessary to improve the ankle joint by replacing it and using ankle prostheses to reconstruct its function and improve the quality of life.

[0004] After a certain period of use, some patients may experience problems with prosthesis loosening, prosthesis wear, and osteolysis in the initial ankle replacement prosthesis. Therefore, the ankle prosthesis needs to be revised to address the problems that arise after the initial ankle replacement.

[0005] Based on the above technical problems, the existing technology has also provided some solutions, such as the Chinese patent application No. 202310942730.2, which discloses an integrated ankle prosthesis system, including a tibial component and a talar component; the tibial component is located above the talar component, and an inner concave surface is provided on the lower end surface of the tibial component facing the talar component; an outer convex surface is provided on the upper end surface of the talar component facing the tibial component; and the inner concave surface matches the outer convex surface; friction contact surfaces are provided on both the inner concave surface and the outer convex surface, and the friction contact surface is a metal-ceramic interface, three tibial trabeculae are provided on the tibial component, and two talar trabeculae are provided on the talar component.

[0006] The above-mentioned integrated prosthesis system has a high degree of integrity, but the integrated ankle joint prosthesis is composed of a tibial component and a talar component, and the ankle joint is inconvenient to install. After one side component is installed, the installation of the other side component is more difficult, which increases the complexity and time of the operation. When the ankle joint prosthesis is partially loose or worn, the entire tibial component or talar component needs to be removed from the inside of the bone surface for renovation and replacement, which is inconvenient to operate; and the friction contact surface is a metal-ceramic interface. Due to the high impact load environment of the ankle joint, the ceramic is prone to cracking under the high impact load of the ankle joint, resulting in prosthesis failure. Summary of the Invention

[0007] In view of the problems in the prior art that ankle prosthesis systems are inconvenient to install and the entire prosthesis needs to be removed for renovation and replacement when the prosthesis becomes partially loose or worn, the purpose of the present invention is to provide a revision-type total ankle prosthesis system.

[0008] In order to solve the above problems, the present invention adopts the following technical solutions:

[0009] A revision total ankle prosthesis system includes an ankle prosthesis body, the ankle prosthesis body including a tibial component, a talar component, a connecting insert located between the tibial component and the talar component, and a bone fixation nail, the bone fixation nail being located on the outer wall of the tibial component and the talar component on a side away from the insert, and having a limit assembly disposed inside the bone fixation nail to prevent loosening and dislocation;

[0010] The tibial component includes a tibial plate, which has a mounting slot vertically opened on one side of the tibial plate close to the insert. The mounting slot is arranged in a T-shaped structure, and a plug-in block is provided on the outer wall of the insert close to the tibial plate and is matched with the mounting slot.

[0011] Optionally, the talar assembly includes a talar plate, a first arcuate structural surface is provided on the outer wall of the talar plate close to the insert, and a second arcuate structural surface is provided on the outer wall of the insert close to the talar plate that slides with the first arcuate structural surface.

[0012] Optionally, the tibial plate and the talar plate are provided with a plug-in connection groove on the outer wall on the side away from the embedment, and a limit seat is symmetrically provided on the inner wall of each plug-in connection groove, and the limit seat is arranged in an L-shaped structure. An anti-loosening ring and a fastener are provided at the top of the plug-in connection groove between the two limit seats, and each anti-loosening ring includes a first ring body and a second ring body located at the top of the first ring body, and the outer walls of one side of the first ring body and the second ring body are connected to the inner wall of the plug-in connection groove, and a limit slot is formed between the top of the first ring body and the bottom of the second ring body, and the top of the second ring body starts to have a limited entry slot away from the side of the talar plate, and the top of the second ring body located on the side of the limited entry slot is provided with an entry slope structure.

[0013] Optionally, the fastener includes a fixed threaded column, a limiting plate limitedly located inside the limiting slot is connected to the outer wall on one side of the top of the fixed threaded column, a hexagonal column is provided at the bottom of the fixed threaded column, and an inner hexagonal slot is provided at the top of the fixed threaded column.

[0014] Optionally, the bone fixing nail is arranged in an I-shaped structure with one end open and the interior hollow, and limited fastening grooves are symmetrically provided on the outer walls on both sides of the bone fixing nail, and a movable groove is provided on the inner walls on both sides of each limited fastening groove. The bone fixing nail is connected with a connecting column matching the plug-in connecting groove near the end of the opening, and the connecting column is symmetrically provided with a limiting groove matching the limiting seat on the side away from the bone fixing nail. The limiting groove is arranged in an L-shaped structure, and a fastening threaded hole is provided on the top of the connecting column located between the two limiting grooves, and the fastening threaded hole is threadedly connected to the fixing threaded column.

[0015] Optionally, the limiting assembly includes an active bevel gear, a driven bevel gear, a limiting abutment block, a return spring, a fixing column, a bearing seat, a driving shaft and a driving block, the active bevel gear sleeve is located on the outer circumferential wall of the fixing column, the fixing column is located inside the connecting column just below the fastening threaded hole, the bottom of the fixing column is connected to the inside of the connecting column through a bearing, the top of the fixing column is provided with a hexagonal driving groove matching the hexagonal column, the driving shaft is installed inside the bone fixing nail through the bearing seat, the driving blocks are symmetrically distributed on the outer walls on both sides of the driving shaft, one end of the driving shaft is connected to the driven bevel gear, and the driven bevel gear is meshed with the active bevel gear.

[0016] Optionally, the limit abutment block is located inside the limit fastening groove, and limit movable plates are provided on both sides of the limit abutment block. The limit movable plates are located inside the movable groove, and each of the limit movable plates is connected to the inner wall of the limit fastening groove through the return spring, and the driving block is movably abutted against the limit abutment block.

[0017] Optionally, when the fixing threaded column is rotated into the fastening threaded hole, the hexagonal column at the bottom thereof is connected to the hexagonal driving groove.

[0018] Optionally, the friction contact surface of the insert adopts a metal-highly cross-linked polyethylene composite interface.

[0019] Optionally, the bone contact surfaces of the tibial plate and the talar plate are both provided with a porous tantalum metal coating.

[0020] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0021] In the above solution, the revision ankle prosthesis can install and adjust each component separately, solving the installation difficulties of traditional integrated prostheses, significantly reducing the difficulty of surgical operation and shortening the operation time.

[0022] The T-shaped mounting slot of the tibial plate and the insert's plug-in block allow for quick positioning, ensuring precise prosthesis alignment and avoiding repeated adjustments during surgery. The installation is quick and easy, allowing for individual revision and replacement of the insert, tibial component, talar component, and bone fixation pins.

[0023] The bone fixation nails are connected to the tibial plate and talar plate by snap-fitting. When the tibial plate or talar plate is worn or damaged, the damaged parts can be repaired and replaced separately without removing the bone fixation nails, thereby reducing the patient's pain.

[0024] By setting a limit assembly inside the bone fixation nail, the problem of dislocation caused by loosening of the bone fixation nail is prevented. The driving block on the driving shaft is driven by the driven bevel gear to abut the limit block to expand radially, forming a mechanical interlocking limit with the surrounding bone tissue, preventing the displacement of the prosthesis and enhancing the stability of the prosthesis.

[0025] The bone fixation nail is connected to the tibial plate and the talar plate through a connecting column, which facilitates the revision and replacement of individual prosthetic components. The connecting column is connected to the tibial plate and the talar plate through an anti-loosening ring and a fastener to ensure the stability of the connection.

[0026] The bone fixation nail is ensured to be firmly connected to the tibial plate and the talar plate through a linkage method. When the limit seat on the inner wall of the plug-in connection groove is slidably plugged into the limit groove of the connecting column, the anti-loosening ring is located on the fastening threaded hole at the top of the connecting column. By rotating the fixed threaded column, the bottom of the fixed threaded column passes through the anti-loosening ring and enters the fastening threaded hole. During the tightening process, the hexagonal drive groove cooperates with the hexagonal column at the bottom of the fixed threaded column. During the continuous downward rotation, the limit plate on the outer wall of the top of the fixed threaded column is limited to sliding in the landslide structure on one side of the limit slot. Inside the limiting slot, at the same time, the hexagonal column drives the active bevel gear on the fixing column to rotate, and the active bevel gear is meshed and connected with the driven bevel gear, driving the drive shaft to rotate. The driving block pushes the limiting abutment block to expand radially, so that the bone fixation nail and the surrounding bone tissue form a tighter mechanical interlocking limit, effectively preventing the displacement of the prosthesis. The limit of the anti-loosening ring prevents the drive shaft from rotating and causing the bone fixation nail to loosen. This innovative design significantly improves the efficiency of revision surgery, reduces the risk of complications, and brings higher postoperative comfort and prosthesis service life to patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the invention.

[0028] Figure 1 A top view of the overall prosthesis of the present invention;

[0029] Figure 2 For the present invention Figure 1 Schematic diagram of the split structure in;

[0030] Figure 3 This is an axonometric diagram of the internal structure of the bone component plug-in connection groove of the present invention;

[0031] Figure 4 This is a schematic diagram of the anti-loosening ring and fastener structure of the present invention;

[0032] Figure 5 This is an axonometric view of the bone fixation nail and the connecting column of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the anti-loosening annular member on the tibial plate of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the limit assembly of the present invention;

[0035] Figure 8 This is a schematic diagram of the side structure of the bone fixation nail of the present invention.

[0036] [Reference Signs]

[0037] 1. tibial component; 11. tibial plate; 111. mounting slot;

[0038] 2. talar component; 21. talar plate; 211. first curved structural surface;

[0039] 3. Embedded part; 31. Connecting block; 32. Second curved structural surface;

[0040] 4. Bone fixation screw; 40. Position-limiting fastening groove; 401. Movable groove; 41. Connecting column; 42. Position-limiting groove; 43. Fastening threaded hole; 44. Driving bevel gear; 45. Driven bevel gear; 46. Position-limiting abutment block; 461. Position-limiting movable plate; 47. Return spring; 48. Fixing column; 481. Hexagonal drive groove; 492. Bearing seat; 491. Drive block; 49. Drive shaft;

[0041] 5. Plug-in connection slot; 51. Limit seat;

[0042] 52. Anti-loosening ring; 521. First ring body; 522. Second ring body; 523. Position-limiting slot; 524. Landslide structure; 525. Position-limiting slot;

[0043] 53. Fastener; 531. Fixed threaded column; 532. Hexagonal column; 533. Limit plate; 534. Hexagonal socket.

[0044] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0045] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative methods for implementing certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0046] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0047] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0048] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0049] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0050] like Figures 1 to 8 As shown, an embodiment of the present invention provides a revision total ankle prosthesis system, including an ankle prosthesis body, the ankle prosthesis body including a tibial component 1, a talar component 2, a connecting insert 3 located between the tibial component 1 and the talar component 2, and a bone fixation nail 4, the bone fixation nail 4 being located on the outer wall of the tibial component 1 and the talar component 2 away from the insert 3, the ankle prosthesis is designed to be independently detachable and installable, when maintenance is required due to wear or failure, each component can be replaced separately without affecting other parts, when the bone fixation nail 4 is not damaged, the bone fixation nail 4 located inside the bone surface does not need to be replaced together with the tibial component 1 or the talar component 2 that needs to be replaced, this design greatly reduces the risk of injury. The tibial component 1 includes a tibial plate 11, which is provided with a mounting slot 111 vertically on one side of the tibial plate 11 close to the insert 3, and the mounting slot 111 is arranged in a T-shaped structure. A plug-in block 31 is provided on the outer wall of the insert 3 close to the tibial plate 11, and the insert 3 is connected to the tibial plate 11 through the plug-in block 31. The plug-in method is convenient for replacing the insert 3. When maintenance is needed, only the plug-in block 31 needs to be removed to remove the insert 3 from the mounting slot 111, and then replaced with a new insert 3, which greatly improves the flexibility and simplicity of maintenance.

[0051] The talar component 2 includes a talar plate 21, and a first arcuate structural surface 211 is provided on the outer wall of the talar plate 21 near the insert 3. The first arcuate structural surface 211 is an M-shaped structural surface with a concave middle portion and protruding on both sides. A second arcuate structural surface 32 is provided on the outer wall of the insert 3 near the talar plate 21, which is slidingly matched with the first arcuate structural surface 211. The second arcuate structural surface 32 is an arcuate structural surface with a protruding bottom middle portion and concave on both sides. The first arcuate structural surface 211 and the second arcuate structural surface 32 are tightly slidably matched with each other, ensuring a stable connection between the insert 3 and the talar plate 21 to achieve higher joint mobility and stability. The insert 3 is close to the talar plate 21. The friction contact surface adopts a metal-high cross-linked polyethylene composite interface, and the outer convex surface of the outer circumferential wall of the insert 3 is made of high cross-linked polyethylene doped with vitamin E to reduce the wear rate and the risk of bone dissolution. The high cross-linked polyethylene has higher wear resistance than traditional polyethylene through radiation cross-linking and heat treatment, which significantly reduces the generation of wear debris. Compared with traditional polyethylene, the wear debris particles of high cross-linked polyethylene are larger and more inert, and are not easy to cause macrophage activation and inflammatory response. It does not have the brittleness problem of ceramics and is suitable for the high impact load environment of the ankle joint. The bone contact surfaces of the tibial plate 11 and the talar plate 21 that contact the human bone tissue are both provided with a porous tantalum metal coating. The porous tantalum metal coating has the advantages of promoting bone ingrowth and enhancing the stability of prosthesis fixation.

[0052] The tibial component 1, talar component 2, connecting insert 3 and bone fixation nail 4 of the present invention can all be disassembled and replaced. When a component is worn, such as the insert 3, tibial plate 11, talar plate 21 or bone fixation nail 4, each component can be individually repaired and replaced. When the insert 3 is damaged, it is only necessary to pull out the plug block 31 on the insert 3 from the mounting slot 111 of the tibial plate 11 and replace it with a new insert 3.

[0053] When the tibial plate 11 or the talar plate 21 is damaged and needs to be replaced, the bone fixation nail 4 does not need to be removed from the inside of the bone surface. Only the separate tibial plate 11 or the talar plate 21 needs to be replaced, which greatly simplifies the surgical operation process, reduces the surgical risk, reduces the bone loss in the revision surgery, shortens the operation time, and avoids secondary damage to healthy bone tissue.

[0054] like Figure 3 、 Figure 5 and Figure 6As shown, the tibial plate 11 and the talar plate 21 are provided with a plug-in connection groove 5 on the outer wall of the side away from the insert 3, which is convenient for reliable connection with the connecting column 41 at the end of the bone fixation nail 4 through the plug-in connection groove 5. The matching design of the plug-in connection groove 5 and the connecting column 41 ensures a firm combination between the bone fixation nail 4 and the tibial plate 11 or the talar plate 21, which is convenient for separate replacement after the prosthetic component is damaged. The inner wall of each plug-in connection groove 5 is symmetrically provided with a limit seat 51, and the limit seat 51 is arranged in an L-shaped structure. The bone fixation nail 4 is an I-shaped structure with an opening at one end and a hollow interior. The bone fixation nail 4 is connected to the plug-in connection near the end of the opening. The connecting column 41 matches the groove 5, and the connecting column 41 is symmetrically provided with a limiting groove 42 that matches the limiting seat 51 on the side away from the bone fixing nail 4. A fastening threaded hole 43 is provided on the top of the connecting column 41 between the two limiting grooves 42. The structure of the connecting column 41 matches the structure of the plug-in connecting groove 5 to ensure that the connecting column 41 is matched with the plug-in connecting groove 5 and connected. The limiting groove 42 is arranged in an L-shaped structure. The L-shaped limiting groove 42 on the connecting column 41 is tightly matched with the L-shaped limiting seat 51 inside the plug-in connecting groove 5 to ensure that the bone fixing nail 4 will not shift during use, thereby improving the stability and service life of the prosthesis.

[0055] The height of the connecting column 41 is less than the height of the plug-in connecting groove 5. When the tibial plate 11 or the talar plate 21 is combined with the connecting column 41 of the bone fixation nail 4 through the plug-in connecting groove 5 on its outer wall, the anti-loosening ring 52 on the top inner wall of the plug-in connecting groove 5 is located on the fastening threaded hole 43 at the top of the connecting column 41, which facilitates the connection of the tibial plate 11 and the talar plate 21 with the connecting column 41 through the fastener 53 to prevent dislocation of the bone fixation nail 4.

[0056] The matching design of the L-shaped limiting seat 51 and the limiting groove 42 of the present invention allows the bone fixation nail 4 to be quickly plugged and locked with the tibial plate 11 / talar plate 21, which facilitates the replacement of individual components when the prosthesis is partially damaged and avoids overall replacement.

[0057] The dual fixation (mechanical interlocking + screw fastening) of the L-shaped limiting structure and the fastening threaded hole 43 effectively prevents the bone fixation nail 4 from rotating or axially loosening during use, thereby improving the long-term stability of the prosthesis.

[0058] The height of the connecting column 41 is smaller than that of the plug-in connecting groove 5 , and a space is reserved to accommodate the anti-loosening ring 52 and to be compressed by the fastener 53 to further prevent dislocation.

[0059] The plug-in connection simplifies the assembly steps during surgery, and the directional matching design of the limiting groove 42 and the limiting seat 51 can reduce operational errors and improve implantation efficiency.

[0060] like Figures 4 to 6As shown, an anti-loosening ring member 52 and a fastener 53 are provided at the top of the plug-in connection groove 5 between the two limiting seats 51. Each anti-loosening ring member 52 includes a first ring body 521 and a second ring body 522 located at the top of the first ring body 521. The outer walls of one side of the first ring body 521 and the second ring body 522 are connected to the inner wall of the plug-in connection groove 5. The top of the second ring body 522 is located below the horizontal plane of the top of the plug-in connection groove 5 to ensure that the fastener 53 is not higher than the tibial plate 11 or the talar plate 21 during the tightening operation, and will not cause wear to the surrounding bone surface of the patient after implantation. A limiting groove 525 is formed between the top of the first ring body 521 and the bottom of the second ring body 522. The top of the second ring body 522 starts to have a limited entry groove 523 away from the side of the talar plate 21, located The top of the second ring body 522 on one side of the limited entry slot 523 is provided with an entry slide structure 524, and the slide structure 524 allows the fastener 53 to be smoothly introduced during the tightening process. The fastener 53 is designed to fit tightly with the limiting slot 525 to prevent the prosthesis from loosening and dislocating during use. The fastener 53 includes a fixed threaded column 531, and the fastening threaded hole 43 is threadedly connected to the fixed threaded column 531. The outer wall on one side of the top of the fixed threaded column 531 is connected to a limiting plate 533 limited to the inside of the limiting slot 525. A hexagonal column 532 is provided at the bottom of the fixed threaded column 531, and an inner hexagonal groove 534 is opened at the top of the fixed threaded column 531. The inner hexagonal groove 534 is used to receive an inner hexagonal wrench to achieve precise tightening of the fixed threaded column 531 to ensure the stability of the prosthesis.

[0061] When the limit seat 51 on the inner wall of the plug-in connecting groove 5 is slidably inserted into the limit groove 42 of the connecting column 41, at this time, the anti-loosening ring 52 is located on the fastening threaded hole 43 at the top of the connecting column 41. By rotating the fixed threaded column 531, the bottom of the fixed threaded column 531 passes through the anti-loosening ring 52 and enters the fastening threaded hole 43. During the tightening process, the limit plate 533 on the outer wall of the top of the fixed threaded column 531 is slid and limited in the limit slot 525 through the landslide structure 524 on one side of the slot 523. The limitation of the anti-loosening ring 52 prevents the rotation of the drive shaft 49 and causes the bone fixation nail 4 to loosen. This innovative design significantly improves the efficiency of revision surgery, reduces the risk of complications, and brings higher postoperative comfort and prosthesis service life to patients.

[0062] like Figure 4 、 Figure 7 and Figure 8As shown, the bone fixation nail 4 is provided with a limit assembly to prevent loosening and dislocation. The outer walls on both sides of the bone fixation nail 4 are symmetrically provided with limit fastening grooves 40. The limit fastening grooves 40 are used for the limit abutment blocks 46 to slide inside them to ensure that the bone fixation nail 4 is firmly connected to the bone surface. A movable groove 401 is provided on the inner walls on both sides of each limit fastening groove 40. The limit assembly includes an active bevel gear 44, a driven bevel gear 45, a limit abutment block 46, a reset spring 47, a fixed column 48, a bearing seat 492, a drive shaft 49 and a drive block 491. The active bevel gear 44 is sleeved on the outer circumferential wall of the fixing column 48, and the fixing column 48 is located inside the connecting column 41 directly below the fastening threaded hole 43. The bottom of the fixing column 48 is connected to the inside of the connecting column 41 through a bearing, and the top of the fixing column 48 is provided with a hexagonal drive groove 481 matching the hexagonal column 532. When the fixing threaded column 531 rotates into the fastening threaded hole 43, the hexagonal column 532 at its bottom is connected to the hexagonal drive groove 481. The hexagonal column 532 is used to drive the fixing column 48 to rotate, further driving the limiting fastening of subsequent components.

[0063] The driving shaft 49 is installed inside the bone fixation nail 4 through the bearing seat 492, and the driving blocks 491 are symmetrically distributed on the outer walls of both sides of the driving shaft 49. One end of the driving shaft 49 is connected to the driven bevel gear 45, and the driven bevel gear 45 is meshed with the active bevel gear 44. When the active bevel gear 44 rotates, it drives the driven bevel gear 45 meshed with it to rotate, thereby realizing the limit control of the driving shaft 49. The limit abutment block 46 is located inside the limit fastening groove 40, and a limit movable plate 461 is provided on both sides of the limit abutment block 46. The limit movable plate 461 is provided on both sides of the limit movable plate 46. 61 is located inside the movable groove 401, and each of the limiting movable plates 461 is connected to the inner wall of the limiting fastening groove 40 through the reset spring 47. One end of the reset spring 47 is connected to the limiting movable plate 461, and the other end is connected to the inner wall of the movable groove 401. When the driving block 491 is not in contact with the limiting abutment block 46, the limiting abutment block 46 is located in the limiting fastening groove 40, and the driving block 491 is in contact with the limiting abutment block 46. Abutment sliding structures are provided on both sides of the inner wall of the limiting movable plate 461 and both sides of the outer wall of the driving block 491. These structures help to reduce friction and ensure smooth sliding.

[0064] When the limiting seat 51 on the inner wall of the plug-in connecting groove 5 is slidably inserted into the limiting groove 42 of the connecting column 41, the anti-loosening ring 52 is located on the fastening threaded hole 43 at the top of the connecting column 41, and the bottom of the fixed threaded column 531 passes through the anti-loosening ring 52 and enters the fastening threaded hole 43 by rotating the fixed threaded column 531. During the tightening process, the hexagonal driving groove 481 cooperates with the hexagonal column 532 at the bottom of the fixed threaded column 531. During the continuous downward rotation, the limiting plate 533 on the outer wall of the top of the fixed threaded column 531 is limited. The landslide structure 524 on one side of the notch 523 is slidably limited inside the limiting slot 525. At the same time, the hexagonal column 532 drives the active bevel gear 44 on the fixing column 48 to rotate. The active bevel gear 44 is meshed and connected with the driven bevel gear 45, driving the driving shaft 49 to rotate. The driving block 491 pushes the limiting abutment block 46 to expand radially, so that the bone fixing nail 4 and the surrounding bone tissue form a tighter mechanical interlocking limit, effectively preventing the displacement of the prosthesis. The limit of the anti-loosening ring 52 prevents the rotation of the driving shaft 49 from causing the bone fixing nail 4 to loosen.

[0065] The innovative design ensures that the bone fixation nail 4 is firmly connected to the tibial plate 11 and the talar plate 21 through linkage, which significantly improves the efficiency of revision surgery, reduces the risk of complications, and brings higher postoperative comfort and prosthesis service life to patients.

[0066] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A revision total ankle prosthesis system, comprising an ankle prosthesis body, characterized in that: The ankle prosthesis body includes a tibial component, a talar component, a connecting insert located between the tibial component and the talar component, and a bone fixation nail. The bone fixation nail is located on the outer wall of the tibial component and the talar component on a side away from the insert. A limit assembly is provided inside the bone fixation nail to prevent loosening and dislocation. The tibial component includes a tibial plate, which has a mounting slot vertically opened on one side of the tibial plate close to the insert. The mounting slot is arranged in a T-shaped structure, and a plug-in block is provided on the outer wall of the insert close to the tibial plate and is matched with the mounting slot.

2. The revision total ankle prosthesis system according to claim 1, characterized in that: The talar assembly includes a talar plate, a first arcuate structural surface is provided on the outer wall of the talar plate close to the insert, and a second arcuate structural surface is provided on the outer wall of the insert close to the talar plate, which slides and matches with the first arcuate structural surface.

3. The revision total ankle prosthesis system according to claim 1, characterized in that: The tibial plate and the talar plate are both provided with a plug-in connection groove on the outer wall on the side away from the embedment, and each of the plug-in connection grooves is symmetrically provided with a limit seat, and the limit seat is arranged in an L-shaped structure, and an anti-loosening ring and a fastener are provided at the top of the plug-in connection groove between the two limit seats. Each anti-loosening ring includes a first ring body and a second ring body located at the top of the first ring body, and the outer walls of one side of the first ring body and the second ring body are connected to the inner wall of the plug-in connection groove, and a limit slot is formed between the top of the first ring body and the bottom of the second ring body, and the top of the second ring body starts to have a limited entry notch away from the side of the talar plate, and the top of the second ring body located on the side of the limited entry notch is provided with an entry slope structure.

4. The revision total ankle prosthesis system according to claim 3, characterized in that: The fastener includes a fixed threaded column, a limiting plate limitedly located inside the limiting slot is connected to the outer wall of one side of the top of the fixed threaded column, a hexagonal column is provided at the bottom of the fixed threaded column, and an inner hexagonal slot is provided at the top of the fixed threaded column.

5. The revision total ankle prosthesis system according to claim 4, characterized in that: The bone fixing nail is set in an I-shaped structure with one end open and the interior hollow. Limited fastening grooves are symmetrically provided on the outer walls on both sides of the bone fixing nail. A movable groove is provided on the inner walls on both sides of each limited fastening groove. A connecting column matching the plug-in connecting groove is connected to the end of the bone fixing nail close to the opening. The connecting column is symmetrically provided with limited grooves matching the limited seat on the side away from the bone fixing nail. The limited groove is set in an L-shaped structure. A fastening threaded hole is provided on the top of the connecting column located between the two limited grooves, and the fastening threaded hole is threadedly connected to the fixing threaded column.

6. The revision total ankle prosthesis system according to claim 5, characterized in that: The limiting assembly includes an active bevel gear, a driven bevel gear, a limiting abutment block, a return spring, a fixing column, a bearing seat, a driving shaft and a driving block. The active bevel gear is sleeved on the outer circumferential wall of the fixing column, the fixing column is located inside the connecting column just below the fastening threaded hole, the bottom of the fixing column is connected to the inside of the connecting column through a bearing, the top of the fixing column is provided with a hexagonal driving groove matching the hexagonal column, the driving shaft is installed inside the bone fixing nail through the bearing seat, the driving blocks are symmetrically distributed on the outer walls on both sides of the driving shaft, one end of the driving shaft is connected to the driven bevel gear, and the driven bevel gear is meshed with the active bevel gear.

7. The revision total ankle prosthesis system according to claim 6, characterized in that: The limit abutment block is located inside the limit fastening groove, and limit movable plates are provided on both sides of the limit abutment block. The limit movable plates are located inside the movable groove, and each of the limit movable plates is connected to the inner wall of the limit fastening groove through the return spring, and the driving block is movably abutted against the limit abutment block.

8. The revision total ankle prosthesis system according to claim 6, characterized in that: When the fixing threaded column rotates into the fastening threaded hole, the hexagonal column at the bottom is connected with the hexagonal driving groove.

9. The revision total ankle prosthesis system according to claim 6, characterized in that: The friction contact surface of the insert adopts a metal-highly cross-linked polyethylene composite interface.

10. The revision total ankle prosthesis system according to claim 6, characterized in that: The bone contact surfaces of the tibial plate and the talar plate are both provided with a porous tantalum metal coating.

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