Revision total ankle prosthesis system

Abstract

The application provides a revision total ankle prosthesis system, belonging to the field of biomedical engineering. The system comprises an ankle prosthesis body, which comprises a tibial component, a talus component, a connecting insert located between the tibial component and the talus component, and a bone fixation nail. The bone fixation nail is located on the outer wall of the tibial component and the talus component away from the insert. The bone fixation nail is internally provided with a anti-loosening dislocation limiting component. The tibial component comprises a tibial plate, and a mounting slot is vertically arranged on the side of the tibial plate close to the insert. An insert block matched with the mounting slot is arranged on the outer wall of the side of the insert close to the tibial plate. The ankle prosthesis can realize the separate installation and replacement of the tibial plate, the talus plate and the bone fixation nail. The bone fixation nail is connected through clamping, cooperates with the limiting component and the bevel gear to drive radial expansion, enhances the mechanical interlocking of the bone tissue, prevents loosening, and ensures the connection stability through the design of the anti-loosening ring and the threaded fastening.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of biomedical engineering, more particularly to a revision total ankle prosthesis system. BACKGROUND

[0002] The ankle joint is composed of the lower end of the tibia, the lower end of the fibula and the talus. The medial malleolus on the medial side of the lower end of the tibia, the lateral malleolus on the lateral side of the lower end of the fibula and the posterior malleolus on the posterior side of the lower end of the tibia together form a forked structure, tightly sandwiching the talus in the middle, forming the bony structure of the ankle joint and providing basic stability for the joint.

[0003] When the ankle joint of the human body has problems such as injury, disease, hyperplasia, ankle bone tumor and congenital deformity, it will cause long-term pain and life activity disorder, and it is necessary to improve the ankle joint by replacement, and to reconstruct the function by means of ankle joint prosthesis to improve the quality of life.

[0004] After the primary ankle joint replacement prosthesis is used for a certain period of time, some patients may have problems such as prosthesis loosening, prosthesis wear and bone resorption, so it is necessary to revise the ankle joint prosthesis according to the problems after the primary ankle joint replacement.

[0005] Based on the above technical problems, the prior art also gives some solutions, such as the integrated ankle joint prosthesis system disclosed in Chinese patent application No. 202310942730.2, which comprises a tibial component and a talus component; the tibial component is located above the talus component, and the tibial component is provided with an inwardly concave inner concave surface on the lower end surface facing the talus component; the talus component is provided with an outwardly convex outer convex surface on the upper end surface facing the tibial component; and the inner concave surface and the outer convex surface are matched; a friction contact surface is provided on the inner concave surface and the outer convex surface, which is a metal ceramic interface, three tibial trabeculae are provided on the tibial component, and two talus trabeculae are provided on the talus component.

[0006] The above-mentioned integrated prosthesis system has high integrity, but the integrated ankle joint prosthesis in the above-mentioned application is composed of a tibial component and a talus component, which is inconvenient to install, and after one component is installed, it is difficult to install the other component, increasing the complexity and time of the operation; when the ankle joint prosthesis is loose or worn locally, the whole tibial component or talus component needs to be taken out from the inside of the bone surface for revision and replacement, which is inconvenient to operate; and the friction contact surface is a metal ceramic interface, which is easy to break under the high impact load of the ankle joint due to the high impact load environment of the ankle joint, resulting in failure of the prosthesis. SUMMARY

[0007] In view of the problems of inconvenient installation of the ankle prosthesis system in the prior art, and the need to remove the whole prosthesis for revision and replacement when local loosening or wear occurs in the prosthesis, the purpose of the present application is to provide a revision type total ankle prosthesis system.

[0008] To solve the above problems, the present application adopts the following technical solution:

[0009] A revision type total ankle prosthesis system, comprising an ankle prosthesis body, the ankle prosthesis body comprising a tibial component, a talus component, a connecting insert located between the tibial component and the talus component, and a bone fixation nail, the bone fixation nail being located on the outer wall of the tibial component and the talus component away from the insert, and the bone fixation nail being internally provided with a limiting component for preventing loosening and dislocation.

[0010] The tibial component comprises a tibial plate, a mounting slot being vertically provided on the side of the tibial plate close to the insert, the mounting slot being provided in a T-shaped structure, and the insert being provided on the outer wall of the side close to the tibial plate with a plug-in block matched and connected with the mounting slot.

[0011] Optionally, the talus component comprises a talus plate, the talus plate being provided on the outer wall of the side close to the insert with a first arc-shaped structure surface, and the insert being provided on the outer wall of the side close to the talus plate with a second arc-shaped structure surface matched and slid with the first arc-shaped structure surface.

[0012] Optionally, the tibial plate and the talus plate are each provided on the outer wall of the side away from the insert with a plug-in connection slot, the inner wall of each plug-in connection slot being symmetrically provided with a limiting seat, the limiting seat being provided in an L-shaped structure, the top of the plug-in connection slot between the two limiting seats being provided with an anti-loosening ring and a fastener, each anti-loosening ring comprising a first ring body and a second ring body located on the top of the first ring body, the outer wall of one side of the first ring body and the second ring body being connected with the inner wall of the plug-in connection slot, a limiting clamping groove being formed between the top of the first ring body and the bottom of the second ring body, a limiting entry groove being formed on the top of the second ring body away from the talus plate, and an entry sliding structure being provided on the top of the second ring body on one side of the limiting entry groove.

[0013] Optionally, the fastener comprises a fixed threaded column, the top of one side of the fixed threaded column being connected with a limiting plate located in the inner part of the limiting clamping groove, the bottom of the fixed threaded column being provided with a hexagonal column, and an inner hexagonal groove being provided on the top of the fixed threaded column.

[0014] Optionally, the bone fixation nail is provided in an I-shaped structure with an open end and a hollow interior, limit fastening grooves are symmetrically and throughly formed on the outer walls of the bone fixation nail, a movable groove is formed on the inner walls of each limit fastening groove, a connecting column matched with the plug-in connecting groove is throughly connected to the bone fixation nail near the open end, limit grooves matched with the limit seats are symmetrically formed on the side of the connecting column away from the bone fixation nail, the limit grooves are provided in an L-shaped structure, a fastening threaded hole is arranged on the top of the connecting column between the two limit grooves, and the fastening threaded hole is threadedly connected with the fixed threaded column.

[0015] Optionally, the limit assembly comprises a driving bevel gear, a driven bevel gear, a limit abutting block, a return spring, a fixed column, a bearing seat, a driving shaft and a driving block, the driving bevel gear is sleeved on the outer circumferential wall of the fixed column, the fixed column is located inside the connecting column below the fastening threaded hole, the bottom of the fixed column is connected with the inside of the connecting column through a bearing, a hexagonal driving groove matched with the hexagonal column is formed on the top of the fixed column, the driving shaft is installed inside the bone fixation nail through the bearing seat, the driving blocks are symmetrically arranged on the outer walls of the driving shaft, one end of the driving shaft is connected with the driven bevel gear, and the driven bevel gear is meshingly connected with the driving bevel gear.

[0016] Optionally, the limit abutting block is located inside the limit fastening groove, limit movable plates are arranged on the two sides of the limit abutting block, the limit movable plates are located inside the movable grooves, each limit movable plate is connected with the inner wall of the limit fastening groove through the return spring, and the driving blocks are movably abutted with the limit abutting block.

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

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

[0019] Optionally, the bone contact surfaces of the tibial plate and the talus plate are provided with porous tantalum metal coatings.

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

[0021] In the above scheme, the revision type ankle joint prosthesis can separately install and adjust each component, solves the installation problem of the traditional integrated prosthesis, significantly reduces the operation difficulty, and shortens the operation time.

[0022] The T-shaped mounting slot of the tibial plate and the plug-in block of the insert are quickly positioned, ensuring accurate positioning of the prosthesis, avoiding repeated debugging during surgery, fast installation, and facilitating separate revision and replacement of the insert, tibial component, talus component, and bone fixation nail.

[0023] The bone fixation nails are connected to the tibial plate and the talus plate through a clamping method. When the tibial plate or the talus plate is worn or damaged, the damaged parts can be individually revised and replaced without disassembling the bone fixation nails, thereby reducing the pain of the patient.

[0024] By setting a limiting component inside the bone fixation nail, the dislocation problem 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 against the limiting abutment block, which is radially expanded, forming a mechanical interlocking limit with the surrounding bone tissue, preventing displacement of the prosthesis and enhancing the stability of the prosthesis.

[0025] The bone fixation nail is connected to the tibial plate and the talus plate through a connecting column, facilitating the revision and replacement of individual prosthesis components. The connecting column is connected to the tibial plate and the talus plate through an anti-loosening ring and a fastener, thereby ensuring the stability of the connection.

[0026] Through linkage, the bone fixation nail is stably connected to the tibial plate and the talus plate. When the limiting seat on the inner wall of the plug-in connection slot slides into the limiting groove inside the connecting column, the anti-loosening ring is located in the fastening thread 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 into the fastening thread hole. During the tightening process, the hexagonal drive groove cooperates with the hexagonal column at the bottom of the fixed threaded column, and during the continuous downward rotation process, the limiting plate on the outer wall of the top of the fixed threaded column slides into the limiting card slot through the landslide structure on one side of the limiting slot, and at the same time, the hexagonal column drives the driving of the main bevel gear on the fixed column, the main bevel gear is connected with the driven bevel gear, and the driving shaft is rotated, the driving block pushes the limiting abutment block to radially expand, so that the bone fixation nail and the surrounding bone tissue form a more close mechanical interlocking limit, effectively preventing the displacement of the prosthesis, and the anti-loosening ring prevents the rotation of the driving shaft from causing the loosening of the bone fixation nail. This innovative design significantly improves the efficiency of the revision surgery, reduces the risk of complications, and brings higher postoperative comfort and prosthesis service life to the patient. BRIEF DESCRIPTION OF DRAWINGS

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

[0028] Figure 1 is a top view of the overall prosthesis of the present application;

[0029] Figure 2 Split structure schematic diagram in the application Figure 1

[0030] Figure 3 Bone assembly plug-in connection slot internal structure axonometric view in the application

[0031] Figure 4 Anti-loosening ring structure and fastener structure schematic diagram in the application

[0032] Figure 5 Bone fixation nail and connecting column axonometric view in the application

[0033] Figure 6 Anti-loosening ring structure on tibial plate schematic diagram in the application

[0034] Figure 7 Limiting assembly structure schematic diagram in the application

[0035] Figure 8 Bone fixation nail side structure schematic diagram in the application

[0036] [Reference signs]

[0037] 1, tibial assembly; 11, tibial plate; 111, mounting slot

[0038] 2, talus assembly; 21, talus plate; 211, first arc-shaped structure surface

[0039] 3, embedded part; 31, plug-in block; 32, second arc-shaped structure surface

[0040] 4, bone fixation nail; 40, limiting fastening slot; 401, movable slot; 41, connecting column; 42, limiting slot; 43, fastening threaded hole; 44, driving bevel gear; 45, driven bevel gear; 46, limiting abutting block; 461, limiting movable plate; 47, return spring; 48, fixed column; 481, hexagonal driving slot; 492, bearing seat; 491, driving block; 49, driving shaft

[0041] 5, plug-in connection slot; 51, limiting seat

[0042] 52, anti-loosening ring; 521, first ring body; 522, second ring body; 523, limiting entry slot; 524, landslide structure; 525, limiting clamping groove

[0043] 53, fastener; 531, fixed threaded column; 532, hexagonal column; 533, limiting plate; 534, internal hexagonal groove

[0044] ​As shown in the drawings, in order to clearly show the structure of the embodiments of the present application, specific structures and devices are marked in the drawings, but this is only for the need of illustration, and is not intended to limit the present application to the specific structures, devices and environments, and those skilled in the art can adjust or modify these devices and environments according to specific needs. DETAILED DESCRIPTION

[0045] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the following embodiments are the best, preferred embodiments, and other alternative embodiments can also be implemented by those skilled in the art for some known technologies; and the drawings are only used to more specifically describe the embodiments, and are not intended to specifically limit the present application.

[0046] It should be noted that in the specification, "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like indicate that the described embodiment can include a specific feature, structure or property, but not necessarily every embodiment includes the specific feature, structure or property. In addition, when a specific feature, structure or property is described in combination with an embodiment, it should be within the knowledge of those skilled in the art to implement such a feature, structure or property in combination with other embodiments (whether or not explicitly described).

[0047] Generally, the terms can be understood at least in part from the context in which they are used. For example, depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular or can be used to describe combinations of features, structures, or characteristics, in the plural, without necessarily dictating whether any such feature, structure, or characteristic is required, desired, or necessary only once, or some multiple thereof. Additionally, the term "based on" can be understood as not necessarily of exclusive alternatives, but rather as allowing for additional implicit factors known to those of ordinary skill in the art to exist in some capacity so as to at least partially underlie a decision, action, or statement.

[0048] It can be understood that the meaning of "on", "above" and "over" in the present application should be interpreted in the broadest way, so that "on" not only means "directly on" something, but also includes the meaning of "on" something with intervening characteristics or layers therebetween, and "above" or "over" not only means the meaning of "above" or "over" something, but also can include the meaning of "above" or "over" something without intervening characteristics or layers therebetween.

[0049] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0050] like Figures 1 to 8 As shown, this embodiment of the invention provides a revision-type total ankle joint prosthesis system, including an ankle joint prosthesis body. The ankle joint prosthesis body includes a tibial component 1, a talus component 2, a connecting insert 3 located between the tibial component 1 and the talus component 2, and a bone fixation screw 4. The bone fixation screw 4 is located on the outer wall of the tibial component 1 and the talus component 2 on the side away from the insert 3. The ankle joint prosthesis is designed to be independently detachable and installable. When maintenance is required due to wear or failure, each component can be replaced individually without affecting other parts. When the bone fixation screw 4 is not damaged, the bone fixation screw 4 located inside the bone surface does not need to be replaced along with the tibial component 1 or the talus component 2 that needs to be replaced. This design greatly reduces the risk of injury. This reduces the patient's recovery time and medical expenses, while also improving the efficiency and success rate of revision surgery. The tibial component 1 includes a tibial plate 11. The tibial plate 11 has a vertically formed mounting slot 111 on the side near the insert 3. The mounting slot 111 is T-shaped. The insert 3 has a plug block 31 on the outer wall of the side near the tibial plate 11 that matches and connects to the mounting slot 111. The insert 3 is connected to the tibial plate 11 through the plug block 31. The plug-in method facilitates the replacement of the insert 3. When maintenance is required, the insert block 31 can be removed from the mounting slot 111 to remove the insert 3 and then replace it with a new insert 3, which greatly improves the flexibility and ease of maintenance.

[0051] The talus assembly 2 comprises a talus plate 21, and the talus plate 21 is provided with a first arc-shaped structure surface 211 on the outer wall of the side close to the embedded part 3, the first arc-shaped structure surface 211 is an m-shaped structure surface with the middle part being recessed and the two sides being protruded, the embedded part 3 is provided with a second arc-shaped structure surface 32 on the outer wall of the side close to the talus plate 21, the second arc-shaped structure surface 32 is an arc-shaped structure surface with the bottom middle part being protruded and the two sides being recessed, the first arc-shaped structure surface 211 and the second arc-shaped structure surface 32 are in close sliding matching, the stable connection between the embedded part 3 and the talus plate 21 is ensured, higher joint mobility and stability are realized, the friction contact surface of the side close to the talus plate 21 of the embedded part 3 is a metal-high cross-linked polyethylene composite interface, the outer convex surface at the outer circumferential wall of the embedded part 3 is a high cross-linked polyethylene material doped with vitamin E, so as to reduce the wear rate and the risk of osteolysis, the high cross-linked polyethylene is cross-linked through radiation and heat treatment, the wear resistance is higher than that of traditional polyethylene, the wear debris is significantly reduced, compared with traditional polyethylene, the high cross-linked polyethylene wear debris is larger and more inert, and is not easy to cause macrophage activation and inflammatory reaction, there is no problem of brittleness of ceramics, and the high cross-linked polyethylene is suitable for the high impact load environment of the ankle joint, the bone contact surfaces of the tibial plate 11 and the talus plate 21 in contact with the human bone tissue are provided with porous tantalum metal coating, and the porous tantalum metal coating has the advantages of promoting bone ingrowth and enhancing the stability of the prosthesis fixation.

[0052] The tibial assembly 1, the talus assembly 2, the connecting embedded part 3 and the bone fixation nail 4 can be disassembled and replaced, when some components such as the embedded part 3, the tibial plate 11, the talus plate 21 or the bone fixation nail 4 are worn out, the components can be individually repaired and replaced, when the embedded part 3 is damaged, only the plug-in block 31 on the embedded part 3 needs to be pulled out of the mounting slot 111 of the tibial plate 11 and dismounted, and a new embedded part 3 can be replaced.

[0053] When the tibial plate 11 or the talus plate 21 needs to be replaced due to damage, the bone fixation nail 4 does not need to be taken out from the inside of the bone surface, only the tibial plate 11 or the talus plate 21 needs to be replaced, the surgical operation process is greatly simplified, the surgical risk is reduced, the bone loss in the revision surgery is reduced, the operation time is shortened, and the secondary damage to healthy bone tissue is avoided.

[0054] As Figure 3 , Figure 5 and Figure 6As shown, the tibial plate 11 and the talus plate 21 are provided with a plug-in connection groove 5 on the outer wall away from the side of the embedding piece 3, which facilitates reliable connection with the connecting column 41 at the end of the bone fixation nail 4, and the matching design of the plug-in connection groove 5 and the connecting column 41 ensures the stable combination between the bone fixation nail 4 and the tibial plate 11 or the talus plate 21, facilitating individual replacement after the damage of the prosthesis component, and the limit seat 51 is symmetrically arranged on the inner wall of each plug-in connection groove 5, and the limit seat 51 is arranged in an L-shaped structure, and the bone fixation nail 4 is arranged in an I-shaped structure with an open end and a hollow inside, and the bone fixation nail 4 is connected with the connecting column 41 matched with the plug-in connection groove 5 through the connecting column 41 close to the open end, and the connecting column 41 is symmetrically provided with a limit groove 42 matched with the limit seat 51 on the side away from the bone fixation nail 4, and the top of the connecting column 41 between the two limit grooves 42 is provided with a fastening screw hole 43, and the connecting column 41 is matched with the plug-in connection groove 5, which ensures the matching and connection of the connecting column 41 and the plug-in connection groove 5, and the limit groove 42 is arranged in an L-shaped structure, and the L-shaped limit groove 42 on the connecting column 41 is matched with the L-shaped limit seat 51 inside the plug-in connection groove 5, which ensures that the bone fixation nail 4 will not be displaced 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 connection groove 5, and when the tibial plate 11 or the talus plate 21 is combined with the connecting column 41 of the bone fixation nail 4 through the plug-in connection groove 5 on the outer wall thereof, the anti-loosening ring 52 on the top inner wall of the plug-in connection groove 5 is located on the top fastening screw hole 43 of the connecting column 41, which facilitates the connection of the tibial plate 11 and the talus plate 21 with the connecting column 41 through the fastener 53, and prevents the dislocation and displacement of the bone fixation nail 4.

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

[0057] The double fixation (mechanical interlocking + screw fastening) of the L-shaped limit structure and the fastening screw hole 43 effectively prevents the rotation or axial loosening of the bone fixation nail 4 during use, thereby improving the long-term stability of the prosthesis.

[0058] The height of the connecting column 41 is less than the height of the plug-in connection groove 5, and the space is reserved to accommodate the anti-loosening ring 52 and is compressed by the fastener 53, which further prevents dislocation.

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

[0060] As Figures 4 to 6As shown, the top of the plug-in connection slot 5 between the two limiting seats 51 is provided with an anti-loosening ring 52 and a fastener 53. Each anti-loosening ring 52 comprises a first ring body 521 and a second ring body 522 located on the top of the first ring body 521. The outer wall of one side of the first ring body 521 and the second ring body 522 is connected with the inner wall of the plug-in connection slot 5. The top of the second ring body 522 is below the top horizontal plane of the plug-in connection slot 5, so as to ensure that the fastener 53 is not higher than the tibial plate 11 or the talus plate 21 during the tightening operation, and does not cause wear to the surrounding bone surface of the patient after implantation. The first ring body 521 and the second ring body 522 form a limiting card slot 525 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 away from the side of the talus plate 21 starts to limit the slot 523. The top of the second ring body 522 located on one side of the limiting slot 523 is provided with an entering landslide structure 524, which smoothly guides the fastener 53 during the tightening process. The fastener 53 is designed to tightly fit with the limiting card slot 525 to prevent loosening and dislocation of the prosthesis during use. The fastener 53 comprises a fixed threaded column 531, a fastening threaded hole 43 and a fixed threaded column 531. The outer wall on one side of the top of the fixed threaded column 531 is connected with a limiting plate 533 located inside the limiting card slot 525. The bottom of the fixed threaded column 531 is provided with a hexagonal column 532. The top of the fixed threaded column 531 is provided with an internal hexagonal groove 534 for receiving an internal hexagonal wrench to accurately tighten the fixed threaded column 531, so as to ensure the stability of the prosthesis.

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

[0062] As Figure 4 , Figure 7 and Figure 8As shown, the bone fixation nail 4 is internally provided with an anti-loosening and dislocation limiting assembly, a limiting fastening groove 40 is symmetrically and throughly formed on the outer wall of the bone fixation nail 4 on both sides, the limiting fastening groove 40 is used for sliding of the limiting abutting block 46 inside, and the stable connection of the bone fixation nail 4 and the inside of the bone surface is ensured, and the movable groove 401 is formed on the inner wall of each limiting fastening groove 40 on both sides, the limiting assembly comprises a driving bevel gear 44, a driven bevel gear 45, a limiting abutting block 46, a return spring 47, a fixed column 48, a bearing seat 492, a driving shaft 49 and a driving block 491, the driving bevel gear 44 is sleeved on the outer circumferential wall of the fixed column 48, the fixed column 48 is located inside the connecting column 41 below the fastening threaded hole 43, the bottom of the fixed column 48 is connected with the inside of the connecting column 41 through a bearing, a hexagonal driving groove 481 matched with the hexagonal column 532 is formed on the top of the fixed column 48, when the fixed threaded column 531 is rotated into the inside of the fastening threaded hole 43, the hexagonal column 532 at the bottom thereof is connected with the hexagonal driving groove 481, and the hexagonal column 532 is used for driving the fixed column 48 to rotate, further driving the limiting fastening of the subsequent components.

[0063] The driving shaft 49 is installed in the inside of the bone fixation nail 4 through the bearing seat 492, the driving block 491 is symmetrically and throughly formed on the outer wall of the driving shaft 49 on both sides, one end of the driving shaft 49 is connected with the driven bevel gear 45, the driven bevel gear 45 is connected with the driving bevel gear 44 in meshing, when the driving bevel gear 44 rotates, the driven bevel gear 45 meshed with the driving bevel gear 44 also rotates, the limiting control of the driving shaft 49 is realized, the limiting abutting block 46 is located in the limiting fastening groove 40, the limiting abutting block 46 is provided with a limiting movable plate 461 on both sides, the limiting movable plate 461 is located in the movable groove 401, each limiting movable plate 461 is connected with the inner wall of the limiting fastening groove 40 through the return spring 47, one end of the return spring 47 is connected with the limiting movable plate 461, and the other end is connected with the inner wall of the movable groove 401, when the driving block 491 is not in abutment with the limiting abutting block 46, at this time, the limiting abutting block 46 is located in the limiting fastening groove 40, the driving block 491 is in abutment with the limiting abutting block 46, and the inner wall of the limiting movable plate 461 and the outer wall of the driving block 491 on both sides are provided with abutment sliding structures, which are helpful to reduce friction and ensure smooth sliding.

[0064] When the limiting seat 51 on the inner wall of the plug-in connecting groove 5 slides and plugs into the limiting groove 42 of the connecting column 41, the anti-loosening ring-shaped part 52 is located on the fastening screw hole 43 at the top of the connecting column 41, the fixed screw column 531 is rotated, the bottom of the fixed screw column 531 passes through the anti-loosening ring-shaped part 52 and enters the inside of the fastening screw hole 43, in the process of screwing, the hexagonal driving groove 481 cooperates with the hexagonal column 532 at the bottom of the fixed screw column 531, in the process of continuously rotating downward, the limiting plate 533 on the outer wall at the top of the fixed screw column 531 slides and limits into the limiting clamping groove 525 through the landslide structure 524 on one side of the limiting slot 523, at the same time, the hexagonal column 532 drives the driving bevel gear 44 on the fixed column 48 to rotate, the driving bevel gear 44 is connected with the driven bevel gear 45 in meshing, drives the driving shaft 49 to rotate, the driving block 491 pushes the limiting abutting block 46 to expand radially, so that the bone fixation nail 4 and the surrounding bone tissue form more closely mechanical interlocking limiting, effectively prevent the displacement of the prosthesis, the anti-loosening ring-shaped part 52 limits the rotation of the driving shaft 49 to prevent the loosening of the bone fixation nail 4.

[0065] Through linkage, the bone fixation nail 4 is connected stably with the tibial plate 11 and the talus plate 21, the innovative design significantly improves the efficiency of the revision surgery, reduces the risk of complications, and brings higher postoperative comfort and prosthesis service life to the patient.

[0066] The present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application. In order to make the public have a thorough understanding of the present application, specific details are described in the following preferred embodiments of the present application, and the present application can also be fully understood without the description of these details to those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0067] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can also be made, which should be regarded as the protection scope of the present application.

Claims

1. A revision total ankle prosthesis system comprising an ankle prosthesis body, characterized in that, The ankle prosthesis body comprises a tibia component, a talus component, a connecting insert between the tibia component and the talus component, and a bone fixation nail on the outer wall of the tibia component and the talus component away from the insert, and a limiting component is arranged inside the bone fixation nail to prevent loosening and dislocation; The tibia component comprises a tibia plate, and a mounting slot is vertically arranged on the side of the tibia plate close to the insert, the mounting slot is arranged in a T-shaped structure, and the insert is provided with a plug-in block matched and connected with the mounting slot on the outer wall of the side of the insert close to the tibia plate; The talus component comprises a talus plate, and an insertion connection groove is arranged on the outer wall of the side of the tibia plate and the talus plate away from the insert, the inner wall of each insertion connection groove is symmetrically provided with a limiting seat, the limiting seat is arranged in an L-shaped structure, a loosening ring and a fastener are arranged on the top of the insertion connection groove between the two limiting seats, each loosening ring comprises a first ring body and a second ring body arranged on the top of the first ring body, the outer wall of one side of the first ring body and the second ring body is connected with the inner wall of the insertion connection groove, a limiting clamping groove is formed between the top of the first ring body and the bottom of the second ring body, a limiting inlet slot is arranged on the top of the second ring body away from the talus plate, and an entering landslide structure is arranged on the top of the second ring body on one side of the limiting inlet slot; The fastener comprises a fixed threaded column, a limiting plate is connected to the inside of the limiting clamping groove on the outer wall of one side of the top of the fixed threaded column, a hexagonal column is arranged on the bottom of the fixed threaded column, and an internal hexagonal groove is arranged on the top of the fixed threaded column; The limiting component comprises a driving bevel gear, a driven bevel gear, a limiting abutting block, a return spring, a fixed column, a bearing seat, a driving shaft and a driving block, the driving bevel gear is sleeved on the outer circumferential wall of the fixed column, a hexagonal driving groove matched with the hexagonal column is arranged on the top of the fixed column, the driving shaft is arranged in the bone fixation nail through the bearing seat, the driving blocks are arranged in a symmetrical structure on the outer walls of the two sides of the driving shaft, one end of the driving shaft is connected with the driven bevel gear, and the driven bevel gear is engaged and connected with the driving bevel gear.

2. The revision total ankle prosthesis system of claim 1, wherein, The outer wall of the side of the talus plate close to the insert is provided with a first arc-shaped structure surface, and the outer wall of the side of the insert close to the talus plate is provided with a second arc-shaped structure surface matched with the first arc-shaped structure surface in sliding.

3. The revision total ankle prosthesis system of claim 1, wherein, The bone fixation nail is arranged in an I-shaped structure with an open end and a hollow inside, limiting fastening grooves are symmetrically and through-arranged on the outer walls of the two sides of the bone fixation nail, a movable groove is arranged on the inner walls of the two sides of each limiting fastening groove, a connecting column matched with the insertion connection groove is through-arranged on the side of the bone fixation nail close to the open end, limiting grooves matched with the limiting seats in limiting are symmetrically arranged on the side of the connecting column away from the bone fixation nail, the limiting grooves are arranged in an L-shaped structure, a fastening threaded hole is arranged on the top of the connecting column between the two limiting grooves, and the fastening threaded hole is threadedly connected with the fixed threaded column; The fixed column is located inside the connecting column directly below the fastening threaded hole, and the bottom of the fixed column is connected with the inside of the connecting column through a bearing.

4. The revision total ankle prosthesis system of claim 3, wherein, The limiting abutting block is located inside the limiting fastening groove, and limiting movable plates are arranged on the two sides of the limiting abutting block, the limiting movable plates are located inside the movable groove, each limiting movable plate is connected with the inner wall of the limiting fastening groove through the reset spring, and the driving block is movably abutted with the limiting abutting block.

5. The revision total ankle prosthesis system of claim 3, wherein, When the fixed threaded column rotates into the inside of the fastening threaded hole, the hexagonal column at the bottom of the fixed threaded column is connected with the hexagonal driving groove.

6. The revision total ankle prosthesis system of claim 1, wherein, The friction contact surface of the embedded part adopts a metal-high cross-linking polyethylene composite interface.

7. The revision total ankle prosthesis system of claim 1, wherein, The bone contact surfaces of the tibial plate and the talus plate are provided with porous tantalum metal coating.

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