Tibial platform assembly and knee prosthesis having the same

Abstract

The application provides a tibial platform assembly and a knee joint prosthesis with the same, wherein the tibial platform assembly comprises: a first driving member arranged on a tibial platform and hingedly connected with a tibial pad, the first driving member having a first driving state and a first static state, when the first driving member is in the first driving state, the first driving member can be telescoped in the direction from the tibial platform to the tibial pad; a second driving member arranged on the tibial platform and hingedly connected with the tibial pad, the second driving member having a second driving state and a second static state, when the second driving member is in the second driving state, the second driving member can be telescoped in the direction from the tibial platform to the tibial pad; and the first driving member and the second driving member cooperate to adjust the distance and / or the inclination angle between the tibial pad and the tibial platform. The technical scheme of the application effectively solves the problem that the relative position between the tibial pad and the tibial platform cannot be adjusted in the related art.

Description

TECHNICAL FIELD

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

[0002] In the field of modern orthopedic surgery, especially for knee joint replacement surgery, the tibial platform prosthesis plays a crucial role. The traditional design of the tibial platform prosthesis is mainly fixed, that is, the angle and height of the platform are determined at the factory, and cannot be personalized according to the specific anatomical characteristics of the patient and the rehabilitation situation after surgery. This limitation becomes particularly evident in the face of significant individual differences between patients, including but not limited to the morphological changes of the distal femur, the deviation of the lower extremity biomechanical line, and the state of soft tissue balance disorder, which are directly related to the success of artificial knee joint replacement surgery.

[0003] Specifically, the shortcomings of the fixed tibial platform prosthesis are as follows:

[0004] 1. Low matching degree of platform and femoral prosthesis contact surface: Due to the lack of flexibility, the traditional fixed structure is difficult to ideally match the unique distal femoral morphology of each patient, especially in the case of large joint range of motion or asymmetric joint space, which can cause poor contact, stress concentration and other problems, thereby affecting the stability and comfort of the joint.

[0005] 2. High risk of postoperative complications: Inaccurate matching can lead to a series of postoperative complications, such as joint instability, uneven stress distribution, accelerated prosthesis wear, persistent pain, and even prosthesis loosening, which not only affects the quality of life of patients, but also shortens the service life of the prosthesis.

[0006] 3. Unable to adjust: The tibial platform and tibial spacer of the tibial platform prosthesis on the market are fixed structures, that is, the relative position between the tibial platform and the tibial spacer has been determined at the time of manufacture, and cannot be adjusted at the time of implantation, which makes it impossible to adjust the relative position between the tibial platform and the tibial spacer according to the actual situation of the patient.

[0007] 4. Risk of secondary surgery: In the face of postoperative joint dysfunction or changes in patient's anatomical characteristics, the traditional prosthesis often needs to be corrected through secondary surgery, which not only increases the physical burden of the patient, but also may bring additional risks such as infection and bleeding. SUMMARY

[0008] The main purpose of the present application is to provide a tibial platform assembly and a knee joint prosthesis with the same, to solve the problem of being unable to adjust the relative position between the tibial spacer and the tibial platform in the related art.

[0009] To achieve the above object, according to one aspect of the present application, a tibial platform assembly is provided, comprising: a tibial platform; a tibial spacer arranged on the tibial platform, the tibial spacer being movably connected with the tibial platform; a first driving member arranged on the tibial platform and hingedly connected with the tibial spacer, the first driving member having a first driving state and a first static state, when the first driving member is in the first driving state, the first driving member is able to stretch and contract in a direction from the tibial platform to the tibial spacer; a second driving member arranged on the tibial platform and hingedly connected with the tibial spacer, the second driving member having a second driving state and a second static state, when the second driving member is in the second driving state, the second driving member is able to stretch and contract in a direction from the tibial platform to the tibial spacer; wherein the first driving member and the second driving member cooperate to adjust a distance and / or an inclination angle between the tibial spacer and the tibial platform.

[0010] Further, the first driving member comprises a connecting column and a driving screw, a first end of the driving screw is rotatably arranged on the tibial platform, a first end of the connecting column is threadedly connected with a second end of the driving screw, a second end of the connecting column is hingedly connected with the tibial spacer, and a middle part of the connecting column is rotationally connected with the tibial platform, so that the connecting column is able to move in an axial direction thereof.

[0011] Further, the first driving member further comprises a first magnet arranged on the driving screw, and an external driving mechanism is able to drivingly cooperate with the first magnet to rotate the driving screw.

[0012] Further, the tibial platform assembly further comprises a rotation-stopping structure, the rotation-stopping structure comprises a guide block and a guide groove in guiding cooperation with the guide block, the tibial platform is provided with a first mounting hole, one of the guide block and the guide groove is arranged on an outer surface of the connecting column, and the other of the guide block and the guide groove is arranged on the tibial platform and located on an inner wall of the first mounting hole.

[0013] Further, the first end of the connecting column is provided with a threaded hole, an axis of the threaded hole is arranged in parallel with the direction from the tibial platform to the tibial spacer, and the driving screw is arranged in the threaded hole.

[0014] Further, the tibial platform assembly further comprises a locking member, the locking member is adjustably arranged on the tibial platform, the locking member has a rotation-stopping state and an avoiding state, an outer surface of the driving screw is provided with a recess, when the locking member is in the rotation-stopping state, the locking member is insertedly cooperated with the recess to limit rotation of the driving screw, and when the locking member is in the avoiding state, the locking member is separated from the recess.

[0015] Further, the recess is a plurality of recesses, the plurality of recesses are arranged on the outer surface of the driving screw in a circumferential direction of the driving screw, and when the locking member is in the rotation-stopping state, one end of the locking member is inserted into one of the plurality of recesses.

[0016] Further, the locking member comprises a rotation-stopping screw rod and a second magnet arranged on the rotation-stopping screw rod, and the tibial platform is provided with a second mounting hole in communication with the first mounting hole, and the rotation-stopping screw rod is arranged in the second mounting hole, and the external driving mechanism can cooperate with the second magnet to rotate the rotation-stopping screw rod.

[0017] Further, the tibial spacer comprises a first spacer and a second spacer, the first spacer is movably connected with the tibial platform, the first spacer comprises a spacer body and a stop plate, the spacer body is provided with a first mounting groove, and the stop plate is arranged on the spacer body and located at the first mounting groove, the connecting column comprises a column body and a hemisphere arranged on an end of the column body away from the driving screw rod, the column body is threadedly connected with the driving screw rod, the maximum outer dimension of the surface of the hemisphere connected with the column body is greater than the outer diameter of the column body, and the hemisphere is in stop cooperation with the stop plate.

[0018] Further, the stop plate comprises a first plate body and a second plate body, the spacer body is further provided with a second mounting groove, and the first plate body and the second plate body are movably arranged in the second mounting groove, the first plate body and the second plate body can be close to or away from each other, and the hemisphere is in stop cooperation with the first plate body and the second plate body.

[0019] According to another aspect of the present application, a knee joint prosthesis is provided, comprising a tibial platform assembly, which is the tibial platform assembly described above.

[0020] By the technical scheme of the present application, the tibial platform assembly comprises a tibial platform, a tibial spacer, a first driving member and a second driving member. The first driving member and the second driving member can be extended and retracted in the direction from the tibial platform to the tibial spacer, so that when one of the first driving member and the second driving member is extended and retracted, i.e. the first driving member is in the first driving state or the second driving member is in the second driving state, the tibial spacer can be moved relative to the tibial platform, so that the angle between the tibial spacer and the tibial platform can be adjusted. When the first driving member and the second driving member are both extended and retracted, the first driving member and the second driving member can simultaneously drive the tibial spacer to move relative to the tibial platform, so that the distance between the tibial spacer and the tibial platform can be adjusted. When the first driving member and the second driving member are not extended and retracted, the relative position between the tibial spacer and the tibial platform remains unchanged. Therefore, the technical scheme of the present application effectively solves the problem that the relative position between the tibial spacer and the tibial platform cannot be adjusted in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve the purpose of explaining the present application. The present application is not limited by the accompanying drawings.

[0022] Figure 1Fig. 1 shows a perspective structural schematic view of a tibial platform assembly according to the present application;

[0023] Figure 2 Fig. 2 shows a sectional schematic view of a first position of the tibial platform assembly of Fig. 1; Figure 1

[0024] Figure 3 Fig. 3 shows an enlarged schematic view of a portion A of the tibial platform assembly of Fig. 1; Figure 1

[0025] Figure 4 Fig. 4 shows a sectional schematic view of a second position of the tibial platform assembly of Fig. 1; Figure 1

[0026] Figure 5 Fig. 5 shows a sectional schematic view of a third position of the tibial platform assembly of Fig. 1; Figure 1

[0027] Figure 6 Fig. 6 shows a perspective structural schematic view of a first driving member, a second driving member and a first spacer of the tibial platform assembly of Fig. 1; Figure 1

[0028] Figure 7 Fig. 7 shows a perspective structural schematic view of a spacer body of the tibial platform assembly of Fig. 1. Figure 1

[0029] Wherein, the above figures include the following reference signs:

[0030] 10, tibial platform; 11, first mounting hole;

[0031] 20, tibial spacer; 21, first spacer; 211, spacer body; 2111, first mounting groove; 2112, second mounting groove; 212, stop plate; 2121, first plate body; 2122, second plate body; 22, second spacer;

[0032] 30, first driving member; 31, connecting column; 311, column body; 312, hemispherical body; 32, driving screw; 321, recess; 33, first magnet;

[0033] 40, second driving member;

[0034] 50, rotation-stopping structure; 51, guide block;

[0035] 60, locking member; 61, rotation-stopping screw; 62, second magnet;

[0036] 70, closing plate;

[0037] 80, first elastic member;

[0038] 90, second elastic member. ​​​​​​DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0040] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth herein are not limiting of the scope of the application. It should be understood that the various parts of the drawings are not necessarily drawn to scale, and that, for the purpose of convenience and clarity, not all components and steps can be shown in a given figure. Techniques, methods, and devices known to those of ordinary skill in the art can not be discussed in detail, but rather can be assumed to be known by those of ordinary skill in the art. In the examples shown and discussed herein, any specific values should be interpreted as merely illustrative, and not as a limitation on the scope of the exemplary embodiments. Thus, other examples of the exemplary embodiments can have different values. It is noted that like references and labels can be used to denote like items throughout the drawings, and thus, once an item is defined in one drawing, it is not necessary to further discuss it in subsequent drawings.

[0042] As Figure 1 and Figure 2As shown, the tibial platform assembly of the embodiment comprises a tibial platform 10, a tibial shim 20, a first driving member 30 and a second driving member 40. The tibial shim 20 is arranged on the tibial platform 10 and movably connected with the tibial platform 10. The first driving member 30 is arranged on the tibial platform 10 and hingedly connected with the tibial shim 20, and the first driving member 30 has a first driving state and a first static state. When the first driving member 30 is in the first driving state, the first driving member 30 can be extended or retracted in the direction from the tibial platform 10 to the tibial shim 20. The second driving member 40 is arranged on the tibial platform 10 and hingedly connected with the tibial shim 20, and the second driving member 40 has a second driving state and a second static state. When the second driving member 40 is in the second driving state, the second driving member 40 can be extended or retracted in the direction from the tibial platform 10 to the tibial shim 20. The first driving member 30 and the second driving member 40 cooperate to adjust the distance and / or the inclination angle between the tibial shim 20 and the tibial platform 10.

[0043] By applying the technical solution of the embodiment, the tibial platform assembly comprises the tibial platform 10, the tibial shim 20, the first driving member 30 and the second driving member 40. The first driving member 30 and the second driving member 40 can be extended or retracted in the direction from the tibial platform 10 to the tibial shim 20. When one of the first driving member 30 and the second driving member 40 is extended or retracted, i.e., the first driving member 30 is in the first driving state or the second driving member is in the second driving state, the tibial shim 20 can be moved relative to the tibial platform 10, thereby adjusting the angle between the tibial shim 20 and the tibial platform 10. When the first driving member 30 and the second driving member 40 are both extended or retracted, the first driving member 30 and the second driving member 40 can simultaneously drive the tibial shim 20 to move relative to the tibial platform 10, thereby adjusting the distance between the tibial shim 20 and the tibial platform 10. When the first driving member 30 and the second driving member 40 are both not extended or retracted, the relative position between the tibial shim 20 and the tibial platform 10 remains unchanged. Therefore, the technical solution of the embodiment effectively solves the problem in the related art that the relative position between the tibial shim and the tibial platform cannot be adjusted.

[0044] It should be noted that the first driving member 30 and the second driving member 40 cooperate, which means that the first driving member 30 and / or the second driving member 40 is extended, or the first driving member 30 and / or the second driving member 40 is retracted, or the first driving member 30 and the second driving member 40 are both static, i.e., by the extension or retraction of the first driving member 30 and / or the second driving member 40, the distance and / or the inclination angle between the tibial shim 20 and the tibial platform 10 can be adjusted.

[0045] Specifically, when the first driving member 30 is in the first driving state and the second driving member 40 is in the second driving state, the distance between the tibial pad 20 and the tibial platform 10 can be adjusted, i.e., the distance between the tibial pad 20 and the tibial platform 10 is increased or decreased.

[0046] When the first driving member 30 is in the first driving state and the second driving member 40 is in the second static state, or the first driving member 30 is in the first static state and the second driving member 40 is in the second driving state, the angle of inclination between the tibial pad 20 and the tibial platform 10 can be adjusted.

[0047] When the first driving member 30 is in the first static state and the second driving member 40 is in the second static state, the tibial pad 20 and the tibial platform 10 remain relatively static.

[0048] The shortest line between the axis of the first driving member 30 and the axis of the second driving member 40 is perpendicular to the direction from the tibial platform 10 to the tibial pad 20.

[0049] In the present embodiment, the direction from the tibial platform 10 to the tibial pad 20 refers to the direction from the tibial platform 10 to the side of the tibial pad 20 that is parallel to the tibial platform 10.

[0050] As shown in Figure 2 and Figure 6 In the present embodiment, the first driving member 30 includes a connecting column 31 and a driving screw 32, the first end of the driving screw 32 is rotatably arranged on the tibial platform 10, the first end of the connecting column 31 is threadedly connected with the second end of the driving screw 32, the second end of the connecting column 31 is hingedly connected with the tibial pad 20, and the middle part of the connecting column 31 is rotationally connected with the tibial platform 10, so that the connecting column 31 can move along the axial direction thereof. The driving screw 32 can rotate relative to the tibial platform 10, and in turn, the driving screw 32 can drive the connecting column 31 to move relative to the tibial platform 10, i.e., the connecting column 31 can move relative to the tibial platform 10 along the direction from the tibial platform 10 to the tibial pad 20, and in turn, the first driving member 30 can be extended or retracted along the direction from the tibial platform 10 to the tibial pad 20. The middle part of the connecting column 31 is rotationally connected with the tibial platform 10, so that the connecting column 31 cannot rotate relative to the tibial platform 10, to ensure that the connecting column 31 can move along the direction from the tibial platform 10 to the tibial pad 20.

[0051] It should be noted that the second driving member 40 has the same structure as the first driving member 30.

[0052] As shown in Figure 2 and Figure 6As shown, in this embodiment, the first driving component 30 further includes a first magnet 33, which is disposed on the driving screw 32. The external driving mechanism can cooperate with the first magnet 33 to drive the driving screw 32 to rotate. The external driving mechanism can generate a magnetic field, and under the action of the magnetic field, the first magnet 33 can drive the driving screw 32 to rotate. Furthermore, driven by the external driving mechanism, the distance and tilt angle between the tibial pad 20 and the tibial plateau 10 can be adjusted even after the tibial plateau component is implanted.

[0053] It should be noted that the first magnet 33 is a radially magnetized magnet.

[0054] The external drive mechanism enables non-invasive adjustment of the angle and distance between the tibial pad and the tibial plateau without the need for a second surgery, avoiding the intervention of internal instruments and reducing the risk of infection and the complexity of the surgery.

[0055] like Figure 6 As shown, in this embodiment, the tibial plateau assembly further includes an anti-rotation structure 50. The anti-rotation structure 50 includes a guide block 51 and a guide groove that guides and cooperates with the guide block 51. A first mounting hole 11 is provided on the tibial plateau 10. The guide block 51 is disposed on the outer surface of the connecting post 31, and the guide groove is disposed on the tibial plateau 10 and located on the inner wall of the first mounting hole 11. The guide block 51 can slide within the guide groove, which allows the connecting post 31 to not only slide smoothly relative to the tibial plateau 10, but also prevents the connecting post 31 from rotating relative to the tibial plateau 10.

[0056] In other embodiments, a guide groove is disposed on the outer surface of the connecting post 31, and a guide block 51 is disposed on the tibial platform 10 and located on the inner wall of the first mounting hole 11.

[0057] The anti-rotation structure 50 includes multiple anti-rotation structures 50, which are spaced apart in the circumferential direction of the connecting column 31.

[0058] It should be noted that the tibial plateau assembly also includes a bearing structure, which comprises a needle roller bearing and a thrust bearing. The needle roller bearing is disposed between the outer periphery of the connecting column 31 and the tibial plateau 10, and is located within the first mounting hole 11. The thrust bearing is disposed at the end of the connecting column 31. By incorporating the needle roller bearing and the thrust bearing, the rotation of the connecting column becomes more stable.

[0059] like Figure 2 As shown, in this embodiment, the first end of the connecting post 31 is provided with a threaded hole. The axis of the threaded hole is parallel to the direction from the tibial plateau 10 to the tibial pad 20, and the driving screw 32 passes through the threaded hole. The driving screw 32 can rotate within the threaded hole, thereby driving the connecting post 31 to move relative to the tibial plateau 10.

[0060] As shown in Figure 5 and Figure 6 In the embodiment, the tibial platform assembly further comprises a locking member 60, which is adjustably arranged on the tibial platform 10. The locking member 60 has a rotation-stopping state and an avoiding state. A recess 321 is arranged on the outer surface of the drive screw 32. When the locking member 60 is in the rotation-stopping state, the locking member 60 is inserted into the recess 321 to limit the rotation of the drive screw 32. When the locking member 60 is in the avoiding state, the locking member 60 is separated from the recess 321. When the locking member 60 moves on the tibial platform, the locking member 60 can be inserted into or separated from the recess 321, i.e., the locking member 60 can be switched between the rotation-stopping state and the avoiding state. When the locking member 60 is inserted into the recess 321, the locking member 60 can limit the rotation of the drive screw 32, i.e., the first driving member 30 is in the first stationary state. At this time, the second driving member 40 can be in the second driving state, and the second driving member 40 can drive the tibial pad 20 to move relative to the tibial platform 10 to adjust the inclination angle between the tibial pad 20 and the tibial platform 10.

[0061] As shown in Figure 5 and Figure 6 In the embodiment, the recess 321 is a plurality of recesses 321, which are arranged on the outer surface of the drive screw 32 in the circumferential direction of the drive screw 32. When the locking member 60 is in the rotation-stopping state, one end of the locking member 60 is inserted into one of the plurality of recesses 321. By arranging a plurality of recesses 321, the locking member 60 has more choices compared with arranging one recess 321. If the first driving member 30 needs to be switched to the first stationary state, the drive screw 32 needs to be rotated to align the recess 321 with the locking member 60, which causes the relative angle between the tibial pad 20 and the tibial platform 10 to change during the rotation of the drive screw 32 when only one recess 321 is arranged. Therefore, arranging a plurality of recesses 321 can more accurately control the adjustment of the inclination angle between the tibial pad 20 and the tibial platform 10.

[0062] It should be noted that the length direction of the recess 321 is parallel to the direction from the tibial platform 10 to the tibial pad 20.

[0063] As shown in Figure 5 and Figure 6As shown, in the embodiment, the locking member 60 comprises a rotation-stopping screw 61 and a second magnet 62 arranged on the rotation-stopping screw 61, and the tibial platform 10 is provided with a second mounting hole which is arranged in communication with the first mounting hole 11, the rotation-stopping screw 61 is arranged in the second mounting hole, and the external driving mechanism can cooperate with the second magnet 62 to rotate the rotation-stopping screw 61. The external driving mechanism can generate a magnetic field, and further control the rotation of the second magnet 62, so that the second magnet 62 drives the rotation-stopping screw 61 to rotate, and thus one end of the rotation-stopping screw 61 can extend into the recess 321, or one end of the rotation-stopping screw 61 is away from the recess 321.

[0064] It should be noted that the second magnet 62 is an axial magnetization magnet.

[0065] As shown in Figure 1 , Figure 6 and Figure 7 , in the embodiment, the tibial pad 20 comprises a first pad 21 and a second pad 22, the first pad 21 is movably connected with the tibial platform 10, the first pad 21 comprises a pad body 211 and a stop plate 212, the pad body 211 is provided with a first mounting groove 2111, and the stop plate 212 is arranged on the pad body 211 and located at the first mounting groove 2111, the connecting column 31 comprises a column body 311 and a hemisphere 312 arranged on an end of the column body 311 away from the driving screw 32, the column body 311 is threadedly connected with the driving screw 32, the maximum outer dimension of the surface where the hemisphere 312 meets the column body 311 is greater than the outer diameter of the column body 311, and the hemisphere 312 is stopperingly connected with the stop plate 212. The hemisphere 312 can be arranged in the first mounting groove 2111, so that the connecting column 31 can be connected with the pad body 211. The maximum outer dimension of the surface where the hemisphere 312 meets the column body 311 is greater than the outer diameter of the column body 311, so that the part of the hemisphere 312 protruding from the column body 311 in the radial direction of the column body 311 can be stopperingly connected with the stop plate 212, so that the hemisphere 312 can be prevented from falling off from the first mounting groove 2111.

[0066] It should be noted that the inner surface of the first mounting groove 2111 is spherical, and the shape thereof is matched with the shape of the outer surface of the hemisphere 312.

[0067] The second pad 22 is fixedly arranged on the tibial platform 10. In other embodiments, the second pad 22 can also be arranged to be movable relative to the tibial platform 10.

[0068] The first driving member 30 and the second driving member 40 are both arranged between the tibial platform 10 and the first pad 21.

[0069] The hemisphere 312 is located at the end of the column. The maximum external dimension of the surface where the hemisphere 312 and the column 311 meet refers to the diameter of the surface where the hemisphere 312 and the column 311 meet being greater than the diameter of the column 311.

[0070] Hemisphere 312 is not necessarily a standard hemisphere; it can also be a part of a hemisphere.

[0071] like Figures 3 to 7 As shown, in this embodiment, the stop plate 212 includes a first plate 2121 and a second plate 2122. The gasket body 211 also has a second mounting groove 2112. The first plate 2121 and the second plate 2122 are movably disposed within the second mounting groove 2112. The first plate 2121 and the second plate 2122 can move closer to each other or further away from each other. The hemisphere 312 is in stop-fitting cooperation with both the first plate 2121 and the second plate 2122. When the first plate 2121 and the second plate 2122 move further away from each other, the hemisphere 312 can pass through the gap between the first plate 2121 and the second plate 2122 and be installed in the first mounting groove 2111. When the first plate 2121 and the second plate 2122 move closer to each other, the first plate 2121 and the second plate 2122 can stop the hemisphere 312.

[0072] It should be noted that the tibial plateau assembly also includes a sealing plate 70, which is disposed within the second mounting groove 2112, with the first plate 2121 located between the second plate 2122 and the sealing plate 70. By providing the sealing plate 70, the first plate 2121 and the second plate 2122 can be confined within the second mounting groove 2112, preventing the first plate 2121 and the second plate 2122 from detaching from the second mounting groove 2112.

[0073] The tibial plateau assembly also includes a first elastic element 80 and a second elastic element 90. The first elastic element 80 is disposed between the closing plate 70 and the first plate 2121, and the second elastic element 90 is disposed between the second plate 2122 and the inner wall of the second mounting groove 2112. The first elastic element 80 and the second elastic element 90 are configured such that when the hemisphere 312 is inserted into the first mounting groove 2111, the edges of the hemisphere 312 can press against the first plate 2121 and the second plate 2122, causing the first plate 2121 to move away from each other. After the hemisphere 312 enters the first mounting groove 2111, under the action of the first elastic element 80 and the second elastic element 90, the first plate 2121 and the second plate 2122 can move closer together to limit the movement of the hemisphere 312.

[0074] Both the first elastic element 80 and the second elastic element 90 are springs.

[0075] The closed plates 70, the first elastic members 80 and the second elastic members 90 each include two, one closed plate 70, one first elastic member 80 and one second elastic member 90 are arranged corresponding to the first driving member 30, and the other closed plate 70, the other first elastic member 80, the other second elastic member 90 are arranged corresponding to the second driving member 40.

[0076] The first plate bodies 2121, the second plate bodies 2122, the second mounting grooves 2112 and the first mounting grooves 2111 each include two, one first plate body 2121, one second plate body 2122, one second mounting groove 2112 and one first mounting groove 2111 are arranged corresponding to the first driving member, and the other first plate body 2121, the other second plate body 2122, the other second mounting groove 2112 and the other first mounting groove 2111 are arranged corresponding to the second driving member 40.

[0077] The knee joint prosthesis of the embodiment includes the tibial platform assembly, and the tibial platform assembly is the tibial platform assembly described above. The tibial platform assembly described above can realize the adjustment of the distance and / or the inclination angle between the tibial pad 20 and the tibial platform 10 through the extension and retraction of the first driving member and the extension and retraction of the second driving member, thereby solving the problem that the distance and the inclination angle between the tibial pad 20 and the tibial platform 10 cannot be adjusted in the prior art. The knee joint prosthesis with the tibial platform assembly described above also has the advantages described above.

[0078] In the description of the present application, it should be understood that "a plurality of" means two or more. The orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0079] For purposes of the description hereinafter, spatial or directional terms, for example, "above", "below", "upper", "lower", and the like, can be used, and relate to the device as illustrated in the figures. However, it is to be understood that no absolute or relative orientation of the device is intended or implied, unless specifically described as such. Terms concerning attachments, coupling and the like, such as "connected" and "coupled" and the like, are to be construed in accordance with their normal meanings, that is, as referring to an indirect or direct connection or coupling. Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to". Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to".

[0080] In addition, it should be pointed out that the use of the terms "first", "second" and the like, to describe various elements, is merely intended to differentiate the elements from one another, and does not connote any special order or order of precedence, unless otherwise specifically indicated. Thus, the use of the terms "first", "second" and the like, is not intended to limit the scope of the present application, and is not intended to connote any special order or order of precedence.

[0081] The preferred embodiments herein disclosed are not intended to limit or restrict the scope of the application, but merely convey the best mode contemplated by the inventors of carrying out the claimed application. Modifications can be made by those skilled in the art, which yet fall within the scope of the present application. Therefore, it is, therefore, to be understood that any variations made to the application are to be considered as being within the scope of the present application as defined by the appended claims, if any, and their equivalents.

Claims

1. A tibial plateau assembly, characterized in that, include: Tibial plateau (10); A tibial pad (20) is disposed on the tibial plateau (10), and the tibial pad (20) is movably connected to the tibial plateau (10); A first driving member (30) is disposed on the tibial platform (10) and hinged to the tibial pad (20). The first driving member (30) has a first driving state and a first stationary state. When the first driving member (30) is in the first driving state, the first driving member (30) can extend and retract along the direction from the tibial platform (10) to the tibial pad (20). The second drive member (40) is disposed on the tibial platform (10) at a distance from the first drive member (30) and is hinged to the tibial pad (20). The second drive member (40) has a second driving state and a second stationary state. When the second drive member (40) is in the second driving state, the second drive member (40) can extend and retract along the direction from the tibial platform (10) to the tibial pad (20). The first drive member (30) and the second drive member (40) cooperate to adjust the distance and / or tilt angle between the tibial pad (20) and the tibial plateau (10); The first driving member (30) includes a connecting post (31) and a driving screw (32). The first end of the driving screw (32) is rotatably disposed on the tibial plateau (10). The first end of the connecting post (31) is threadedly engaged with the second end of the driving screw (32). The second end of the connecting post (31) is hingedly connected to the tibial pad (20). The middle part of the connecting post (31) is anti-rotationally engaged with the tibial plateau (10) so that the connecting post (31) can move along its axial direction. The first driving member (30) further includes a first magnet (33), which is disposed on the driving screw (32). The external driving mechanism can drive and cooperate with the first magnet (33) to make the driving screw (32) rotate.

2. The tibial plateau assembly according to claim 1, characterized in that, The tibial platform assembly also includes an anti-rotation structure (50), which includes a guide block (51) and a guide groove that guides and cooperates with the guide block (51). The tibial platform (10) is provided with a first mounting hole (11). One of the guide block (51) and the guide groove is disposed on the outer surface of the connecting column (31), and the other of the guide block (51) and the guide groove is disposed on the tibial platform (10) and located on the inner wall of the first mounting hole (11).

3. The tibial plateau assembly according to claim 1, characterized in that, The first end of the connecting column (31) is provided with a threaded hole, the axis of which is parallel to the direction from the tibial plateau (10) to the tibial pad (20), and the driving screw (32) passes through the threaded hole.

4. The tibial plateau assembly according to claim 2, characterized in that, The tibial platform assembly also includes a locking member (60), which is positionably disposed on the tibial platform (10). The locking member (60) has a non-rotation state and a clearance state. A recess (321) is provided on the outer surface of the drive screw (32). When the locking member (60) is in the non-rotation state, the locking member (60) and the recess (321) are engaged to restrict the rotation of the drive screw (32). When the locking member (60) is in the clearance state, the locking member (60) is separated from the recess (321).

5. The tibial plateau assembly according to claim 4, characterized in that, There are multiple recesses (321), and the multiple recesses (321) are spaced apart on the outer surface of the drive screw (32) along the circumferential direction. When the locking member (60) is in the anti-rotation state, one end of the locking member (60) extends into one of the multiple recesses (321).

6. The tibial plateau assembly according to claim 4, characterized in that, The locking member (60) includes an anti-rotation screw (61) and a second magnet (62) disposed on the anti-rotation screw (61). A second mounting hole is provided on the tibial platform (10), which is connected to the first mounting hole (11). The anti-rotation screw (61) passes through the second mounting hole. The external drive mechanism can cooperate with the second magnet (62) to make the anti-rotation screw (61) rotate.

7. The tibial plateau assembly according to claim 1, characterized in that, The tibial pad (20) includes a first pad (21) and a second pad (22). The first pad (21) is movably connected to the tibial plateau (10). The first pad (21) includes a pad body (211) and a stop plate (212). The pad body (211) is provided with a first mounting groove (2111). The stop plate (212) is provided on the pad body (211) and located at the first mounting groove (2111). The connecting post (31) includes a post (311) and a hemisphere (312) provided at one end of the post (311) away from the driving screw (32). The post (311) is threadedly engaged with the driving screw (32). The maximum external dimension of the surface of the hemisphere (312) that contacts the post (311) is greater than the outer diameter of the post (311). The hemisphere (312) is engaged with the stop plate (212).

8. The tibial plateau assembly according to claim 7, characterized in that, The stop plate (212) includes a first plate (2121) and a second plate (2122). The gasket body (211) is also provided with a second mounting groove (2112). The first plate (2121) and the second plate (2122) are movably disposed in the second mounting groove (2112). The first plate (2121) and the second plate (2122) can move closer to each other or further away from each other. The hemisphere (312) is in stop-fitting cooperation with both the first plate (2121) and the second plate (2122).

9. A knee joint prosthesis, comprising a tibial plateau assembly, characterized in that, The tibial plateau assembly is the tibial plateau assembly according to any one of claims 1 to 8.

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