Knee prosthesis and tibial platform thereof

Abstract

The application provides a knee joint prosthesis and a tibial platform thereof, wherein the tibial platform comprises: a second support platform which is arranged at intervals with a first support platform and can be adjusted in position relative to the first support platform; a first end of a transmission member is movably arranged on the first support platform, and a second end of the transmission member is arranged on the second support platform; a driving structure comprises a mounting member and a driving member which is rotatably arranged on the mounting member, the rotation axis of the driving member is arranged perpendicularly to the axis of the mounting member, the mounting member is rotatably arranged on the first support platform around the axis thereof, so as to drive the transmission member to rotate around the axis of the mounting member through the driving member, and when the driving member rotates relative to the mounting member, the driving member and the transmission member are drivingly matched, so as to drive the transmission member to rotate in a direction parallel to the rotation axis of the driving member. The technical scheme of the application effectively solves the problem of inconvenient relative position adjustment of the first support platform and the second support platform of the tibial platform in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of knee joint prostheses, in particular to a knee joint prosthesis and a tibial platform thereof. BACKGROUND

[0002] In the field of knee arthroplasty, with the progress of surgical techniques and prosthesis design, more and more patients benefit from total knee arthroplasty (TKA) surgery, especially for the treatment of advanced knee joint diseases. However, with the increase in the number of surgeries, the management of postoperative complications of knee arthroplasty has become increasingly prominent, and the revision surgery required after tibial platform prosthesis failure has become a problem that cannot be ignored. The long-term stability and functional recovery of the tibial platform prosthesis are often affected by preoperative bone defects, especially bone defects such as wedge-shaped and non-stepped bone loss that occur after the initial surgery, which poses a great challenge to subsequent revision surgery.

[0003] At present, one of the main means for handling tibial platform bone defects in clinical practice is to use metal shims or metal reinforcing blocks to restore the normal anatomical structure and joint force line. Metal shims are usually of fixed thickness, with a variety of different thickness specifications to accommodate different degrees of bone defects. However, this fixed-thickness metal shim has significant limitations in handling non-standard bone defects, especially wedge-shaped defects. For patients whose bone defects present a gradual change rather than a stepwise change, traditional fixed-thickness metal shims often cannot accurately match the actual morphology of the bone defect, resulting in the need for additional bone resection in certain areas in order to place the shim, which increases the risk of tibial instability and even causes fractures.

[0004] In addition, the design of metal shims usually only allows adjustment based on their fixed thickness, lacking the function of adjusting the platform angle. In the case of tibial platform defect combined with diaphyseal deformity, the existing technology is difficult to meet the needs of correcting diaphyseal deformity and restoring joint surface angle at the same time. This means that in many cases, doctors must try to restore normal force line and joint surface angle by excessive osteotomy, which undoubtedly increases the difficulty and potential risk of surgery.

[0005] In the related art, the adjustable-angle tibial platform prosthesis includes a first support platform, a second support platform, and an angle adjustment mechanism arranged between the first support platform and the second support platform to adjust the angle between the first support platform and the second support platform. The angle adjustment mechanism includes a plurality of screws and a plurality of sliders corresponding to the plurality of screws, the sliders are moved by the screws, and the second support platform is moved by the sliders, thereby adjusting the angle between the second support platform and the first support platform. However, during adjustment, each screw needs to be turned separately, resulting in cumbersome adjustment. SUMMARY

[0006] The main objective of this invention is to provide a knee joint prosthesis and its tibial platform to solve the problem of inconvenient relative position adjustment of the first and second support platforms of the tibial platform in related technologies.

[0007] To achieve the above objectives, according to one aspect of the present invention, a tibial platform for a knee joint prosthesis is provided, comprising: a first support platform; a second support platform spaced apart from the first support platform and adjustable in position relative to the first support platform; a transmission member, a first end of which is movably disposed on the first support platform, and a second end of which is disposed on the second support platform; and a drive structure including a mounting member and a drive member rotatably disposed on the mounting member, the rotation axis of the drive member being perpendicular to the axis of the mounting member, the mounting member being rotatably disposed on the first support platform about its axis, so as to drive the transmission member to rotate about the axis of the mounting member through the drive member, wherein when the drive member rotates relative to the mounting member, the drive member and the transmission member drive each other to drive the transmission member to rotate about a direction parallel to the rotation axis of the drive member.

[0008] Furthermore, the driving component includes a gear, and the transmission component includes a transmission ball movably disposed on the first support platform and a plurality of first protrusions disposed on the outer surface of the transmission ball. The plurality of first protrusions are spaced apart along a preset direction, which is perpendicular to the axis of the mounting component and perpendicular to the rotation axis of the driving component. The gear meshes with at least one of the plurality of first protrusions.

[0009] Furthermore, the first support platform is provided with a receiving recess for accommodating the transmission ball. Among the multiple first protrusions, the first protrusion farthest from the second support platform is the end protrusion. The distance D between the center of the end protrusion and the receiving recess is greater than or equal to one-fifth and less than or equal to one-third of the diameter of the transmission ball. A convex ball is formed between the end of the transmission ball away from the second support platform and the end protrusion. The outer surface of the convex ball contacts and fits with the receiving recess, and the outer surface of the convex ball protrudes out of or is flush with the outer contour surface of the multiple first protrusions.

[0010] Furthermore, the transmission component also includes a connecting screw, which is mounted on the transmission ball. A threaded hole is provided on the second support platform, and the connecting screw passes through the threaded hole.

[0011] Furthermore, the drive structure also includes an operating member movably disposed on the second support platform. The operating member has drive teeth that mesh with the gear. The operating member has a drive state and a locked state. When the operating member is in the drive state, the operating member drives the gear to rotate around the gear axis. When the operating member is in the locked state, the operating member, the second support platform, and the gear remain relatively stationary.

[0012] Furthermore, the operating component includes an operating lever and a stop plate disposed at the end of the operating lever away from the first support platform. The drive gear is disposed on the side of the end of the operating lever away from the second support platform. The second support platform is provided with a strip-shaped clearance through hole and a limiting groove. The limiting groove is connected to the strip-shaped clearance through hole. The operating lever passes through the strip-shaped clearance through hole. When the stop plate is located in the limiting groove, the operating component is in a locked state.

[0013] Furthermore, a second convex plate is also provided on the second support platform. The second convex plate is disposed in the strip-shaped clearance through hole. The tibial platform of the knee joint prosthesis also includes an elastic element, which is disposed between the stop plate and the second convex plate.

[0014] Furthermore, the first support platform is provided with a mounting hole and a receiving space communicating with the mounting hole. The mounting component includes a mounting shaft and a mounting plate disposed on the mounting shaft. The mounting shaft is rotatably inserted into the mounting hole. The driving component is rotatably disposed on the mounting plate and located in the receiving space. An operating part is provided at the end of the mounting shaft away from the mounting plate.

[0015] Furthermore, the drive structure also includes an operating member movably disposed on the second support platform, the operating member having a drive tooth portion that meshes with a gear, the drive tooth portion being located between the end of the gear and the mounting shaft.

[0016] According to another aspect of the present invention, a knee joint prosthesis is provided, including a tibial platform of the knee joint prosthesis, wherein the tibial platform of the knee joint prosthesis is the tibial platform of the knee joint prosthesis described above.

[0017] According to the technical solution of this invention, the tibial platform of the knee joint prosthesis includes a first support platform, a second support platform, a transmission component, and a drive structure. The second support platform is spaced apart from the first support platform, facilitating adjustment of their relative positions via the drive structure and transmission component. A first end of the transmission component is movably disposed on the first support platform, allowing the drive component to move the transmission component relative to the first support platform. A second end of the transmission component is disposed on the second support platform, enabling the drive component to move the transmission component, which in turn moves the second support platform, thereby changing the relative positions between the second and first support platforms. The rotation axis of the driving component is perpendicular to the axis of the mounting component. This allows the mounting component to rotate while the driving component remains stationary relative to it, enabling the mounting component to drive the transmission component to rotate around its axis. This, in turn, drives the second support platform to rotate around the mounting component's axis. When the mounting component is stationary relative to the first support platform while the driving component rotates, the driving component drives the transmission component to rotate in a direction parallel to its rotation axis. In other words, through the driving structure and transmission component, the second support platform can rotate both around the mounting component's axis and in a direction parallel to the driving component's axis. This allows for adjustment of the position of the second support platform relative to the first support platform, avoiding the need for multiple screws and sliders in existing technologies to adjust the relative position between the first and second support platforms. This makes adjusting the relative position of the second and first support platforms much more convenient. Therefore, the technical solution of this application effectively solves the problem of inconvenient adjustment of the relative position of the first and second support platforms of the tibial platform in related technologies. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the tibial platform of the knee joint prosthesis according to the present invention is shown;

[0020] Figure 2 It shows Figure 1 A cross-sectional view of the second support platform of the tibial platform of the knee prosthesis after its position relative to the first support platform has been adjusted.

[0021] Figure 3 It shows Figure 1 A cross-sectional schematic diagram of the first support platform of the tibial platform of a knee joint prosthesis;

[0022] Figure 4 It shows Figure 1A three-dimensional structural diagram of the second support platform of the tibial platform of the knee joint prosthesis;

[0023] Figure 5 It shows Figure 2 A cross-sectional schematic diagram of the tibial plateau of a knee joint prosthesis;

[0024] Figure 6 It shows Figure 5 A magnified view of point A on the tibial plateau of the knee joint prosthesis;

[0025] Figure 7 It shows Figure 1 A three-dimensional structural diagram of the transmission component of the tibial platform of a knee joint prosthesis;

[0026] Figure 8 It shows Figure 1 A cross-sectional schematic diagram of the first connecting screw on the tibial plateau of the knee joint prosthesis;

[0027] Figure 9 It shows Figure 1 A cross-sectional schematic diagram of the second connecting screw on the tibial platform of the knee joint prosthesis.

[0028] The above figures include the following reference numerals:

[0029] 10. First support platform; 11. Receiving recess; 12. Mounting hole; 13. Receiving space; 20. Second support platform; 21. Threaded hole; 22. Strip-shaped clearance through hole; 23. Limiting groove; 24. Second convex plate; 25. First connecting hole; 26. Second connecting hole; 30. Transmission component; 31. Transmission ball; 311. Convex ball; 32. First convex plate; 321. End convex plate; 33. Connecting screw; 40. Drive structure; 41. Mounting component; 411. Mounting shaft; 4111. Operating part; 412. Mounting plate; 42. Drive component; 421. Gear; 43. Operating component; 431. Drive gear; 432. Operating lever; 433. Stop plate; 50. Elastic component; 60. First connecting screw; 70. Second connecting screw; 71. Connecting rod; 72. Connecting plate; 80. Telescopic sleeve. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0033] like Figure 1 , Figure 2 as well as Figure 4 As shown, the tibial platform of the knee joint prosthesis in this embodiment includes: a first support platform 10, a second support platform 20, a transmission member 30, and a drive structure 40. The second support platform 20 is spaced apart from the first support platform 10 and its position relative to the first support platform 10 is adjustable. The first end of the transmission member 30 is movably disposed on the first support platform 10, and the second end of the transmission member 30 is disposed on the second support platform 20. The drive structure 40 includes a mounting member 41 and a drive member 42 rotatably disposed on the mounting member 41. The rotation axis of the drive member 42 is perpendicular to the axis of the mounting member 41. The mounting member 41 is rotatably disposed on the first support platform 10 about its axis, so that the drive member 30 is driven to rotate about the axis of the mounting member 41 by the drive member 42. When the drive member 42 rotates relative to the mounting member 41, the drive member 42 and the transmission member 30 drive each other to rotate about a direction parallel to the rotation axis of the drive member 42.

[0034] Using the technical solution of this embodiment, the tibial platform of the knee joint prosthesis includes a first support platform 10, a second support platform 20, a transmission member 30, and a drive structure 40. The second support platform 20 is spaced apart from the first support platform 10, facilitating adjustment of the relative position between the second support platform 20 and the first support platform 10 via the drive structure 40 and the transmission member 30. The first end of the transmission member 30 is movably disposed on the first support platform 10, allowing the drive member 42 to move the transmission member 30 relative to the first support platform 10. The second end of the transmission member 30 is disposed on the second support platform 20, enabling the drive member 42 to move the transmission member 30, which in turn moves the second support platform 20, thereby changing the relative position between the second support platform 20 and the first support platform 10. The rotation axis of the driving component 42 is perpendicular to the axis of the mounting component 41. This allows the mounting component 41 to rotate while the driving component 42 remains stationary relative to it. In this case, the mounting component 41 can drive the transmission component 30 to rotate around its axis, which in turn drives the second support platform 20 to rotate around the axis of the mounting component 41. When the mounting component 41 is stationary relative to the first support platform 10 while the driving component 42 rotates, the driving component 42 can drive the transmission component 30 to rotate in a direction parallel to its rotation axis. In other words, through the driving structure 40 and the transmission component 30, the second support platform 20 can rotate around the axis of the mounting component 41 and in a direction parallel to the rotation axis of the driving component 42. This allows for the adjustment of the position of the second support platform 20 relative to the first support platform 10, avoiding the need for multiple screws and sliders in the prior art to adjust the relative position between the first and second support platforms. This makes the adjustment of the relative position between the second support platform 20 and the first support platform 10 more convenient. Therefore, the technical solution of this embodiment effectively solves the problem of inconvenient adjustment of the relative position of the first support platform and the second support platform of the tibial platform in related technologies.

[0035] When the first support platform 10 and the second support platform 20 are parallel, the axis of the mounting component 41 is perpendicular to the direction from the first support platform 10 to the second support platform 20.

[0036] In this embodiment, the first support platform 10 is located below the second support platform 20. In other embodiments, the first support platform 10 is located above the second support platform 20.

[0037] like Figure 2 and Figure 5As shown, in this embodiment, the driving member 42 includes a gear 421, and the transmission member 30 includes a transmission ball 31 movably disposed on the first support platform 10 and a plurality of first protrusions 32 disposed on the outer surface of the transmission ball 31. The plurality of first protrusions 32 are spaced apart along a preset direction, which is perpendicular to the axis of the mounting member 41 and perpendicular to the rotation axis of the driving member 42. The gear 421 meshes with at least one of the plurality of first protrusions 32. Through the meshing of the gear 421 with the first protrusions 32, the gear 421 can drive the transmission ball 31 to move on the first support platform 10. The plurality of first protrusions 32 are spaced apart along the preset direction, which ensures that when the gear 421 drives the transmission ball 31 to rotate in a direction parallel to the rotation axis of the driving member 42, there is always a first protrusion 32 meshing with the gear 421, thus ensuring that the gear 421 drives the transmission ball 31 to rotate in a direction parallel to the rotation axis of the driving member 42.

[0038] The preset direction is perpendicular to the axis of the mounting component 41 and perpendicular to the rotation axis of the driving component 42. This means that when the first support platform 10 and the second support platform 20 are parallel, the preset direction is perpendicular to the axis of the mounting component 41 and perpendicular to the rotation axis of the driving component 42.

[0039] When the driving component 42 and the transmission component 30 drive each other, the transmission component 30 rotates around the rotation axis parallel to the driving component 42, and the rotation axis of the transmission component 30 passes through the center of the transmission ball 31.

[0040] like Figure 2 , Figure 3 as well as Figure 7As shown, in this embodiment, the first support platform 10 is provided with a receiving recess 11 to accommodate the transmission ball 31. Among the plurality of first protrusions 32, the one furthest from the second support platform 20 is the end protrusion 321. The distance D between the center of the end protrusion 321 and the receiving recess 11 is greater than or equal to one-fifth and less than or equal to one-third of the diameter of the transmission ball 31. A convex ball 311 is formed between the end of the transmission ball 31 furthest from the second support platform 20 and the end protrusion 321. The outer surface of the convex ball 311 contacts and engages with the receiving recess 11, and the outer surface of the convex ball 311 protrudes beyond or is flush with the outer contour surface of the plurality of first protrusions 32. By limiting the distance D, it can be ensured that when the gear 421 drives the transmission ball 31 to move on the first support platform 10, there is always a first protrusion 32 meshing with the gear 421. The outer surface of the convex sphere 311 contacts and engages with the receiving recess 11. Compared to providing only the first convex plate 32 on the outer surface of the transmission sphere 31, this increases the contact area between the transmission component 30 and the receiving recess 11, making the interaction force between the transmission component 30 and the first support platform 10 more uniform. This avoids the problem that when the entire outer surface of the transmission sphere 31 is provided with the first convex plate 32, the pressure at the junction of the first convex plate 32 and the first support platform 10 is too high, which could easily lead to damage at the junction of the first convex plate 32 and the first support platform 10.

[0041] It should be noted that the end protrusion 321 is annular, and the distance D between the center of the end protrusion 321 and the receiving recess 11 refers to the distance between the center of the circle of the largest cross-section among the multiple cross-sections of the end protrusion 321 and the inner surface of the receiving recess.

[0042] like Figure 2 and Figure 7 As shown, in this embodiment, the transmission component 30 further includes a connecting screw 33, which is disposed on the transmission ball 31. A threaded hole 21 is provided on the second support platform 20, and the connecting screw 33 passes through the threaded hole 21. The connecting screw 33 not only connects the transmission ball 31 and the second support platform 20, but also, by rotating the transmission ball 31 relative to the second support platform 20, adjusts the distance between the end of the transmission ball 31 furthest from the second support platform 20 and the second support platform 20. This allows for adjustment of the distance between the first support platform 10 and the second support platform 20, i.e., adjusting the height of the tibial platform of the knee joint prosthesis.

[0043] It should be noted that the first protrusion 32 is annular and is arranged around the outer periphery of the transmission ball 31. This ensures that after the transmission ball 31 rotates relative to the second support platform 20, the first protrusion 32 can still maintain meshing with the gear 421.

[0044] like Figure 2, Figure 5 , Figure 7 as well as Figure 8 As shown, in this embodiment, the drive structure 40 further includes an operating member 43 movably disposed on the second support platform 20. The operating member 43 has a drive tooth 431 that meshes with the gear 421. The operating member 43 has a driving state and a locked state. When the operating member 43 is in the driving state, the operating member 43 drives the gear 421 to rotate around the axis of the gear 421. When the operating member 43 is in the locked state, the operating member 43 remains relatively stationary with respect to the second support platform 20 and the gear 421. The operating member 43 can drive the gear 421 to rotate through the drive tooth 431, thereby enabling the gear 421 to drive the transmission ball 31 to move. When the operating member 43 is in the locked state, the operating member 43 remains relatively stationary with respect to both the second support platform 20 and the gear 421, thus preventing the operating member 43 from moving relative to the second support platform 20 and relative to the gear 421.

[0045] like Figure 6 , Figure 8 as well as Figure 9 As shown, in this embodiment, the operating member 43 includes an operating lever 432 and a stop plate 433 disposed at the end of the operating lever 432 away from the first support platform 10. A drive gear 431 is disposed on the side of the operating lever 432 away from the second support platform 20. The second support platform 20 is provided with a strip-shaped clearance through hole 22 and a limiting groove 23. The limiting groove 23 communicates with the strip-shaped clearance through hole 22. The operating lever 432 passes through the strip-shaped clearance through hole 22. When the stop plate 433 is located within the limiting groove 23, the operating member 43 is in a locked state. Pressing the stop plate 433 and the operating lever 432 can drive the drive gear 431 to move, thereby driving the gear 421 to rotate. After the relative positions of the first support platform 10 and the second support platform 20 are adjusted to the correct positions, moving the stop plate 433 into the limiting groove 23 ensures that the relative position between the operating member 43 and the second support platform 20 remains unchanged.

[0046] When the stop plate 433 moves into the limiting groove 23, the stop plate 433 can drive the operating rod 432 to slide in the strip-shaped clearance through hole 22.

[0047] It should be noted that the second support platform 20 is also provided with a first connecting hole 25 that communicates with the limiting groove 23. The tibial platform of the knee joint prosthesis also includes a first connecting screw 60. The first connecting screw 60 passes through the first connecting hole 25. One end of the first connecting screw 60 is located in the limiting groove 23 and abuts against the stop plate 433, thereby enabling the stop plate 433 to be stably located in the limiting groove 23.

[0048] In other embodiments, the second support platform 20 is also provided with a second connecting hole 26. The second connecting hole 26 is located at the end of the strip-shaped clearance through hole 22 away from the first support platform 10. The second connecting hole 26 is provided with threads. The tibial platform of the knee joint prosthesis also includes a second connecting screw 70. The two ends of the second connecting screw 70 are respectively connected to the operating member 43 and the second connecting hole 26.

[0049] The second connecting screw 70 includes a connecting rod 71 and a connecting plate 72 disposed at the first end of the connecting rod 71. The second end of the connecting rod 71 passes through the stop plate 433 and / or the operating rod 432 and is threadedly connected to the stop plate 433 and / or the operating rod 432. The outer peripheral surface of the connecting plate 72 is threadedly connected to the second connecting hole 26. This enables the fixing of the position of the operating element 43.

[0050] The second support platform 20 is also provided with a second protruding plate 24, which is disposed within the strip-shaped clearance through hole 22. The tibial platform of the knee joint prosthesis also includes an elastic element 50, which is disposed between the stop plate 433 and the second protruding plate 24. The second protruding plate 24 and the stop plate 433 together limit the elastic element 50. The elastic element 50 can apply an elastic force to the stop plate 433, so that the stop plate 433 can abut against the groove wall of the limiting groove 23, allowing the stop plate 433 to be stably located within the limiting groove 23. Furthermore, the elastic element 50 provides damping resistance to the operator's hand when the operating member 43 moves relative to the second support platform 20, facilitating the operator to precisely drive the gear 421 to rotate.

[0051] It should be noted that the elastic element 50 is a spring.

[0052] like Figure 2 and Figure 3 As shown, in this embodiment, the first support platform 10 is provided with a mounting hole 12 and a receiving space 13 communicating with the mounting hole 12. The mounting member 41 includes a mounting shaft 411 and a mounting plate 412 disposed on the mounting shaft 411. The mounting shaft 411 is rotatably inserted into the mounting hole 12. The driving member 42 is rotatably disposed on the mounting plate 412 and located within the receiving space 13. An operating part 4111 is provided at the end of the mounting shaft 411 away from the mounting plate 412. The mounting shaft 411 can rotate within the mounting hole 12, thereby allowing the mounting shaft 411 to rotate relative to the first support platform 10. The receiving space 13 can accommodate a gear 421, allowing the gear 421 to move within the first support platform 10. The operating part 4111 can drive the mounting shaft 411 to rotate relative to the first support platform 10.

[0053] The tibial platform also includes a bracket disposed on the first support platform 10, and the mounting shaft 411 is rotatably disposed on the bracket, so that the mounting shaft 411 can be more stably disposed on the first support platform 10.

[0054] It should be noted that the mounting plate 412 includes two spaced apart plates, which allows the gear 421 to rotate more smoothly and makes the position of the gear 421 relative to the mounting shaft 411 more stable. The gear 421 is connected to the mounting plate 412 via a connecting shaft.

[0055] The two opposing sides of the drive gear 431 are fitted with two mounting plates 412, which can guide the movement of the drive gear 431.

[0056] The operating part 4111 has an internal hexagonal hole.

[0057] like Figure 1 , Figure 2 as well as Figure 5 As shown, in this embodiment, the drive structure 40 further includes an operating member 43 movably disposed on the second support platform 20. The operating member 43 has a drive tooth 431 that meshes with the gear 421, and the drive tooth 431 is located between the ends of the gear 421 and the mounting shaft 411. The location of the drive tooth 431 between the gear 421 and the mounting shaft 411 allows the drive tooth 431, the gear 421, and the mounting shaft 411 to occupy less space.

[0058] The drive gear 431 includes a plurality of protruding teeth disposed on the outer surface of the operating lever 432, and the plurality of protruding teeth are arranged sequentially along the axial direction of the operating lever 432.

[0059] It should be noted that the tibial platform of the knee joint prosthesis also includes a telescopic sleeve 80. One end of the telescopic sleeve 80 is connected to the first support platform 10, and the other end of the telescopic sleeve 80 is connected to the second support platform 20. This can prevent bone structures from growing into the space between the first support platform 10 and the second support platform 20.

[0060] It should be noted that the telescopic sleeve 80 is a flexible structure.

[0061] It should be noted that the mounting component 41 also includes a prism disposed on the outer peripheral surface of the mounting shaft 411, and the tibial platform of the knee joint prosthesis also includes a limiting component, which includes a limiting plate disposed on the first support platform 10. The limiting plate contacts and engages with one of the multiple sides of the prism to limit the rotation of the mounting shaft 411.

[0062] The tibial platform of this embodiment can solve the problem that existing tibial platforms cannot accurately fit the tibia when the patient has a wedge-shaped defect and the defect shape is not step-shaped. It can avoid the need for angle-adaptive osteotomy of the proximal tibia and preserve bone volume to the maximum extent.

[0063] The thickness of the tibial platform in this embodiment can be infinitely adjusted within a certain range, which can solve the limitation problem caused by tibial pads with fixed thickness.

[0064] The tibial platform of this embodiment can solve the problems of tibial defects and / or diaphysis deformities. It can correct the perpendicularity of the articular surface to the lower limb force line without excessive osteotomy, and the upper surface of the tibial platform is installed at a certain angle to the extension rod below the tibial platform.

[0065] The tibial platform in this embodiment is an adjustable tibial platform in terms of thickness and tilt angle. The thickness can be adjusted, and the tilt angle of the second support platform relative to the first support platform can vary within a certain range.

[0066] The tibial platform in this embodiment is mainly for cases of tibial platform revision, therefore the tibial platform in this embodiment is a restricted tibial platform.

[0067] In this embodiment, the tibial platform is used such that the distance between the first support platform 10 and the second support platform 20 is adjusted via the connecting screw 33 and the threaded hole 21. When the mounting member 41 is stationary, rotating the driving member 42 causes the transmission member 30 to rotate about a direction parallel to the rotation axis of the driving member 42. When the driving member 42 is stationary relative to the mounting member 41, rotating the mounting member 41 causes the driving member 42 to rotate about the axis of the mounting member 41.

[0068] The knee prosthesis of this embodiment includes a tibial platform, which is the aforementioned tibial platform of the knee prosthesis. Through the cooperation of the transmission member 30 and the drive structure 40, the aforementioned tibial platform of the knee prosthesis can drive the second support platform 20 to rotate about a rotation axis parallel to the drive member 42, and also achieve rotation of the second support platform 20 about the axis of the mounting member 41. This avoids the need for multiple screws and multiple sliders in the prior art to adjust the relative position between the first and second support platforms, making the adjustment of the relative position between the second support platform 20 and the first support platform 10 more convenient. The knee prosthesis with the aforementioned tibial platform also has the above-mentioned advantages.

[0069] In the description of this invention, it should be understood that "a plurality of" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tibial platform for a knee joint prosthesis, characterized in that, include: First support platform (10); The second support platform (20) is spaced apart from the first support platform (10) and its position relative to the first support platform (10) is adjustable; A transmission component (30) has its first end movably disposed on the first support platform (10) and its second end disposed on the second support platform (20). The drive structure (40) includes a mounting member (41) and a drive member (42) rotatably mounted on the mounting member (41). The rotation axis of the drive member (42) is perpendicular to the axis of the mounting member (41). The mounting member (41) is rotatably mounted on the first support platform (10) around its axis, so that the drive member (42) drives the transmission member (30) to rotate around the axis of the mounting member (41). When the drive member (42) rotates relative to the mounting member (41), the drive member (42) and the transmission member (30) drive each other to rotate around the axis of the mounting member (42).

2. The tibial platform of the knee joint prosthesis according to claim 1, characterized in that, The driving component (42) includes a gear (421), and the transmission component (30) includes a transmission ball (31) movably disposed on the first support platform (10) and a plurality of first protrusions (32) disposed on the outer surface of the transmission ball (31). The plurality of first protrusions (32) are spaced apart along a preset direction, which is perpendicular to the axis of the mounting component (41) and perpendicular to the rotation axis of the driving component (42). The gear (421) meshes with at least one of the plurality of first protrusions (32).

3. The tibial platform of the knee joint prosthesis according to claim 2, characterized in that, The first support platform (10) is provided with a receiving recess (11) for accommodating the transmission ball (31). Among the plurality of first protrusions (32), the first protrusion (32) farthest from the second support platform (20) is an end protrusion (321). The distance D between the center of the end protrusion (321) and the receiving recess (11) is greater than or equal to one-fifth of the diameter of the transmission ball (31) and less than or equal to one-third of the diameter of the transmission ball (31). A convex ball (311) is formed between the end of the transmission ball (31) away from the second support platform (20) and the end protrusion (321). The outer surface of the convex ball (311) contacts and fits the receiving recess (11), and the outer surface of the convex ball (311) protrudes out of or is flush with the outer contour surface of the plurality of first protrusions (32).

4. The tibial platform of the knee joint prosthesis according to claim 2 or 3, characterized in that, The transmission component (30) also includes a connecting screw (33), which is disposed on the transmission ball (31). The second support platform (20) is provided with a threaded hole (21), and the connecting screw (33) passes through the threaded hole (21).

5. The tibial plateau of the knee joint prosthesis according to claim 2 or 3, characterized in that, The drive structure (40) further includes an operating member (43) movably disposed on the second support platform (20). The operating member (43) has a drive tooth (431) that meshes with the gear (421). The operating member (43) has a drive state and a locked state. When the operating member (43) is in the drive state, the operating member (43) drives the gear (421) to rotate around the axis of the gear (421). When the operating member (43) is in the locked state, the operating member (43), the second support platform (20), and the gear (421) remain relatively stationary.

6. The tibial plateau of the knee joint prosthesis according to claim 5, characterized in that, The operating component (43) includes an operating lever (432) and a stop plate (433) disposed at one end of the operating lever (432) away from the first support platform (10). The driving tooth (431) is disposed on the side of the operating lever (432) away from the second support platform (20). The second support platform (20) is provided with a strip-shaped clearance through hole (22) and a limiting groove (23). The limiting groove (23) is connected to the strip-shaped clearance through hole (22). The operating lever (432) passes through the strip-shaped clearance through hole (22). When the stop plate (433) is located in the limiting groove (23), the operating component (43) is in the locked state.

7. The tibial plateau of the knee joint prosthesis according to claim 6, characterized in that, The second support platform (20) is also provided with a second convex plate (24), which is disposed in the strip-shaped clearance through hole (22). The tibial platform of the knee joint prosthesis also includes an elastic element (50), which is disposed between the stop plate (433) and the second convex plate (24).

8. The tibial plateau of the knee joint prosthesis according to claim 2 or 3, characterized in that, The first support platform (10) is provided with a mounting hole (12) and a receiving space (13) communicating with the mounting hole (12). The mounting component (41) includes a mounting shaft (411) and a mounting plate (412) disposed on the mounting shaft (411). The mounting shaft (411) is rotatably inserted into the mounting hole (12). The driving component (42) is rotatably disposed on the mounting plate (412) and located in the receiving space (13). An operating part (4111) is provided at one end of the mounting shaft (411) away from the mounting plate (412).

9. The tibial plateau of the knee joint prosthesis according to claim 8, characterized in that, The drive structure (40) further includes an operating member (43) movably disposed on the second support platform (20), the operating member (43) having a drive tooth (431) meshing with the gear (421), the drive tooth (431) being located between the end of the gear (421) and the mounting shaft (411).

10. A knee joint prosthesis, comprising a tibial plateau of the knee joint prosthesis, characterized in that, The tibial platform of the knee joint prosthesis is the tibial platform of the knee joint prosthesis according to any one of claims 1 to 9.

Images