Tibia support prosthesis

Abstract

The invention discloses a tibia support prosthesis which comprises a support body and a connecting piece, the support body is provided with a near bone side facing the connected end face of a tibia and a far bone side deviating from the connected end face of the tibia, and the connecting piece is arranged on the support body in a penetrating mode in the direction from the far bone side to the near bone side; the connecting piece is provided with an arc-shaped part, and the center line of the longitudinal section of the arc-shaped part is arc-shaped; the arc-shaped part is used for moving from the far bone side to the near bone side of the support body, so that the arc-shaped part is inserted into the tibia. By the adoption of the scheme, tibia cortex damage caused by grooving in the front side of the tibia can be avoided, and operation is simplified. The arc-shaped part can move along the arc-shaped center line, and the insertion process of the arc-shaped part is facilitated. The arc-shaped part can improve the moving stability of the prosthesis in the vertical direction and the front-back direction.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a tibial support prosthesis. Background Art

[0002] With the popularization of robotics and 3D printing technologies, the use of biological knee prostheses is becoming more and more widespread. However, the existing mainstream biological knee prostheses still use the design concept of traditional bone cement knee prostheses. For traditional bone cement prostheses, stable initial fixation can be achieved through bone cement, but for biological prostheses, early loosening caused by insufficient initial fixation stability has become one of the main reasons for its early failure.

[0003] The existing knee implants need to be inserted after the groove is cut in the front of the tibia, which will cause damage to the tibial cortex and increase the risk of tibial plateau fracture. In addition, the horizontally inserted anchoring structure has poor stability in front-back movement. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tibial tray prosthesis in order to overcome the defects of the prior art that the initial fixation stability of the tibial tray prosthesis is insufficient and the tibial cortical damage is easily caused.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A tibial tray prosthesis, comprising a tray body and a connecting piece.

[0007] The support body has a proximal bone side facing the connected end surface of the tibia and a distal bone side away from the connected end surface of the tibia, and the connecting member is penetrated through the support body along the direction from the distal bone side to the proximal bone side;

[0008] The connecting member has an arc-shaped portion, the center line of which in its longitudinal section is arc-shaped; the arc-shaped portion is used to move from the distal bone side to the proximal bone side of the support body so that the arc-shaped portion is inserted into the tibia.

[0009] In this scheme, when installing the tibial support prosthesis, usually the end face of the tibia is first partially bone-resected, and the cancellous bone is exposed. The support body is used to connect with the connected end face, and the arc-shaped portion in this scheme can move from the far bone side of the support body to the near bone side, and then insert into the cancellous bone of the tibia, which can avoid the tibial cortical damage caused by the conventional surgery of slotting the front side of the tibia, and can also simplify the operation. In addition, the center line of the arc-shaped portion in its own longitudinal cross section is an arc, and when it is inserted into the process of the arc-shaped portion into the tibia, it can move along the arc-shaped center line, which is conducive to the insertion process of the arc-shaped portion. In addition, after the arc-shaped portion is inserted into the tibia, the arc-shaped portion itself can contact with the tibia in multiple directions, such as in the direction along the bone axis, and in multiple directions with an angle with the bone axis, so as to improve the stability of the prosthesis moving in the vertical direction and the front-back direction. And, the connector is provided with the support body, and when the arc-shaped portion is inserted into the tibia, the support body can be connected to the tibia.

[0010] Preferably, the connecting member is rotatably connected to the support body, and the arc-shaped portion rotates from the distal bone side to the proximal bone side of the support body around the rotational connection between the connecting member and the support body.

[0011] In this solution, the connector and the support body are connected by a rotational connection. During the tibial support prosthesis installation operation, the arcuate portion of the connector can rotate around the connection and be inserted into the cancellous bone at the connected end face of the tibia. This installation method is simple and easy to operate.

[0012] Preferably, the connecting member further comprises a rotating portion and a first connecting portion, the rotating portion is rotatably connected to the support body, the first connecting portion extends between the rotating portion and the arcuate portion, and two ends of the first connecting portion are respectively connected to the rotating portion and the arcuate portion.

[0013] In this solution, the connecting member is rotatably connected to the support body via the rotating portion, and the arcuate portion and the rotating portion are connected via the first connecting portion. The arcuate portion can rotate around the rotating portion relative to the support body.

[0014] Preferably, the first connecting portion is a fan-shaped rib, one end of the rib is connected to the rotating portion, and the other end is connected to the arc-shaped portion along the outer contour of the arc-shaped portion.

[0015] In this solution, by adopting the above structural form, the connection length between the first connecting part and the arc-shaped part is increased, the reliability of the overall structure of the connecting piece is improved, and when the arc-shaped part rotates around the rotating part, its rotation process is smoother. In addition, the rib plate structure can reduce the rotational displacement in all directions. In addition, the rib plate is also inserted and anchored in the cancellous bone of the tibia, which increases the contact area between the connecting piece and the tibia and further improves the stability of the connection.

[0016] Preferably, the first connecting portion is a connecting rod, and there are multiple connecting rods, one end of each of the multiple connecting rods is connected to the rotating portion, and the other end is connected to the arc-shaped portion at intervals along the outer contour of the arc-shaped portion.

[0017] In this solution, by adopting the above structural form, multiple connecting rods can be connected to multiple positions of the outer contour of the arc-shaped portion, thereby improving the stability of the connection and improving the smoothness of the rotation process of the arc-shaped portion.

[0018] Preferably, the first connecting portion is a rib plate, and when the arc-shaped portion moves to the proximal bone side of the support body, the edge of the rib plate facing the support body has a depression.

[0019] In this solution, by adopting the above structural form, the recess can form an avoidance space to avoid interference with the femoral condyle.

[0020] Preferably, the first connecting portion is a connecting rod, and when the arc-shaped portion moves to the proximal bone side of the support body, a connecting rod among the plurality of connecting rods close to the support body has a preset distance from the support body.

[0021] In this solution, by adopting the above structural form, an avoidance space can be formed to avoid interference with the femoral condyle.

[0022] Preferably, the rotating portion is cylindrical, and is arranged in the support body along a direction parallel to the plane where the support body is located, and the first connecting portion and the rotating portion are perpendicular to each other.

[0023] In this solution, the rotating part is arranged in the support body, which can not only improve the stability of the connection with the support body, but also avoid occupying the external space of the support body, resulting in an increase in the volume of the prosthesis, or interference with other structures. In addition, the arrangement direction of the rotating part is parallel to the plane where the support body is located, and the space of the support body itself can be used for arrangement, making the structure of the prosthesis compact. In addition, the first connecting part and the rotating part are perpendicular to each other, so that the connection between the first connecting part and the arc part and the rotating part is more stable, and it is convenient for the first connecting part to be inserted into the cancellous bone of the tibia.

[0024] Preferably, the support body has a mounting hole inside, and the rotating part is arranged in the mounting hole.

[0025] In this solution, the support body and the connecting piece can be integrated through 3D printing, and the rotating part is embedded and confined in the mounting hole of the support body. The rotating part will not fall out of the mounting hole, thereby preventing the rotating part from accidentally detaching from the support body, causing the connecting piece to separate from the support body.

[0026] Preferably, the support body has a mounting groove, which extends from the surface of the support body on the distal bone side to the proximal bone side of the support body; and the mounting groove includes a guide section and a limiting section, the guide section is inclined from the distal bone side to the proximal bone side, the limiting section and the guide section are connected with a limiting protrusion, and the rotating part is arranged in the limiting section.

[0027] In this solution, the surface of the support body is provided with a mounting groove, and the rotating part and the support body can be separately provided and then assembled into one body, so that the connecting piece and the support body can be made separately and then assembled into one body. When the rotating part is installed in the support body, the rotating part can enter the mounting groove from the guide section and move to the limit section; when the rotating part is installed, the limit protrusion can limit the position of the connecting piece.

[0028] Preferably, the connecting member is slidably connected to the support body, and the arc-shaped portion slides along a sliding path of the connecting member and the support body from a distal bone side to a proximal bone side of the support body.

[0029] In this solution, the connector and the support body are connected by a sliding connection. During the tibial support prosthesis installation operation, the arcuate portion of the connector can be inserted into the cancellous bone at the connected end surface of the tibia along the sliding path of the connector on the support body. This installation method is simple and easy to operate.

[0030] Preferably, the tibial tray prosthesis further comprises a guide member and a guide groove, one of the arc-shaped portion and the tray body is connected with the guide member, and the other is provided with the guide groove, and the guide member and the guide groove are slidably matched.

[0031] In this solution, by adopting the above structural form, the cooperation between the guide groove and the guide member forms a sliding path for the connecting member to move relative to the support body. The structure is simple, and the connecting member can be connected to the cancellous bone along the sliding path, which is easy to operate.

[0032] Preferably, the guide member is connected to the arc-shaped portion, the guide groove is penetrated through the support body along the direction from the distal bone side to the proximal bone side, and the extension direction of the guide member and the guide trajectory of the guide groove are both adapted to the center line of the arc-shaped portion.

[0033] In this solution, the arc portion can move along the guide track of the guide groove through the guide member, thereby improving the stability and accuracy of the movement of the arc portion. In addition, the extension direction of the guide member and the guide track of the guide groove are adapted to the arc portion, so that the sliding path of the arc portion is consistent with its own structure, which is conducive to the smooth insertion of the arc portion.

[0034] Preferably, the guide member includes a first guide surface, a second guide surface and a third guide surface, the first guide surface is spaced apart from the arc-shaped portion, and the second guide surface and the third guide surface are respectively arranged on both sides of the first guide surface and connected to the arc-shaped portion.

[0035] In this solution, the guide member includes a plurality of guide surfaces, which can improve the guiding stability of the guide member.

[0036] Preferably, the first guide surface, the second guide surface and the third guide surface form a triangular structure in cross section.

[0037] In this solution, the cross-section of the guide member is a triangular structure, and one of the tips of the triangle faces the arc-shaped portion and is used to connect with the arc-shaped portion, thereby improving the stability of the guide member at various locations close to the arc-shaped portion and away from the arc-shaped portion.

[0038] Preferably, the support body is provided with an extension portion on the surface of the proximal bone side, and the guide groove passes through the support body and the extension portion.

[0039] In this solution, by providing an extension portion, the length of the guide groove can be extended, the guide area can be increased, and the guide performance can be improved.

[0040] Preferably, the tibial tray prosthesis further comprises a second connecting portion and a second limiting portion, wherein the second connecting portion is connected to the guide member and extends in a direction away from the arc-shaped portion; and the second limiting portion is arranged at an extending edge of the second connecting portion toward the tray body;

[0041] The support body is provided with a second limiting groove, the second limiting portion is clamped in the second limiting groove, and the trajectory of the second limiting groove is matched with the center line of the arc portion.

[0042] In this solution, the second limiting portion can limit the maximum distance that the arc portion slides relative to the support body, thereby preventing the arc portion from moving too far, and increasing the connection strength between the arc portion and the support body. The second connecting portion, as a connecting component between the second limiting portion and the arc portion, can also play a guiding role, increase the contact range between the arc portion and the support body, and increase the contact area between the arc portion and the cancellous bone, thereby improving the connection performance with the support body and the cancellous bone.

[0043] Preferably, the second connecting portion is a rib plate, the second limiting portion is cylindrical, and the plane where the second connecting portion is located is perpendicular to the axis of the second limiting portion.

[0044] In this solution, by adopting the above structural form, the structure is simple, and the ribs can further increase the strength of the overall structure. The cylinder and the ribs can form a snap-fit ​​structure that is snap-fitted into the second limiting groove of the support body.

[0045] Preferably, the number of the second limiting portion is at least one, and a plurality of the second limiting portions are arranged at intervals along the extending edge of the second connecting portion.

[0046] In this solution, a plurality of second limiting portions arranged at intervals can be connected to the support body at a plurality of positions of the connecting member, thereby improving the overall structural strength after the connecting member and the support body are connected, and making the overall structure more stable.

[0047] Preferably, when the arc-shaped portion moves to the bone-proximal side of the support body, the edge of the second connecting portion facing the support body has a recess, and the second limiting portion is arranged in the recess.

[0048] In this solution, by adopting the above structural form, an avoidance space can be formed to avoid interference with the femoral condyle.

[0049] Preferably, the arc-shaped portion has a center line of a longitudinal cross section that is in the shape of a circular arc;

[0050] Alternatively, the arc-shaped portion has a convex curve having a preset curvature at a center line of its longitudinal cross section.

[0051] In this solution, the center line of the arc portion can have a variety of linear forms, and the preset curvature is a curvature that enables the arc portion to be implanted in the tibia, and those skilled in the art can design it according to needs. When it is an arc, the arc portion can rotate around a center of a circle, and the trajectory is uniform, and the arc portion can be gradually inserted and anchored in the cancellous bone.

[0052] Preferably, along the direction from the distal bone side to the proximal bone side, the transverse dimension of the arc-shaped portion gradually decreases, and the thickness of the arc-shaped portion gradually decreases.

[0053] In this solution, the transverse direction and the longitudinal direction are two directions perpendicular to each other. The arc portion adopts the above structural form to form a double-taper design, so that the arc portion has a better and more stable press-fit effect when implanted. At the same time, it can provide a compacting compression force for the tibial tray.

[0054] Preferably, the surface and side edges of the arc-shaped portion are provided with saw teeth, and the tips of the saw teeth face the direction where the tibia is located.

[0055] In this solution, by adopting the above structural form, the arc-shaped portion can be easily implanted into the tibia and the anti-exit property of the arc-shaped portion can be improved.

[0056] Preferably, a limiting boss is provided on the side of the end of the arc-shaped portion away from the tibia, and a first limiting groove is provided on the surface of the support body on the distal bone side, wherein the first limiting groove is used to limit the movement of the limiting boss toward the direction where the tibia is located.

[0057] In this solution, the limiting boss can prevent the arc-shaped portion from excessively sinking when the connector is implanted.

[0058] Preferably, a clamping portion is provided at the end of the arc-shaped portion away from the tibia, and a clamping groove is provided on the surface of the support body located on the proximal bone side, and the clamping portion is clamped in the clamping groove.

[0059] In this solution, when the connector is implanted in the cancellous bone, the engaging portion is engaged in the engaging groove, which can prevent the arc-shaped portion from withdrawing from the tibia.

[0060] Preferably, at least one of the surface of the arc-shaped portion, the first connecting portion of the connecting member, the second connecting portion of the connecting member and the surface of the support body located on the proximal bone side is provided with a porous structure.

[0061] In this solution, by adopting the above structural form, the porous structure provides a rough surface, which improves the initial stability of the connector, the support body and the bone, while quickly achieving bone ingrowth and improving the mid- and long-term stability of the connector.

[0062] Preferably, there are a plurality of arc-shaped portions, and the plurality of arc-shaped portions are arranged in sequence and at intervals.

[0063] In this solution, multiple arc-shaped portions can further improve the fixation stability, and the multiple arc-shaped portions are arranged in sequence and at intervals. During surgical implantation, multiple arc-shaped portions can be connected to the cancellous bone through a single implantation.

[0064] Preferably, there are a plurality of the connecting members, and the plurality of the connecting members are arranged at intervals on the support body.

[0065] In this solution, for surgeries with a larger implant space, such as total knee tibial tray prosthesis implantation, the stability of the connection between the prosthesis and the bone can be further improved through multiple connectors.

[0066] Preferably, the tibial support prosthesis also includes a fixing nail, which is connected to the surface of the support body on the proximal bone side and is located on both sides of the arc-shaped portion; along the axial direction of the fixing nail, the outer surface of the fixing nail is provided with a plurality of longitudinal grooves; along the circumferential direction of the fixing nail, the outer surface of the fixing nail is provided with a plurality of serrations.

[0067] In this solution, the fixing nails can play an early fixing role, and the fixing effect of the fixing nails can be improved through the structural form above the fixing nails.

[0068] The positive and progressive effect of the present invention is that: in the installation of the tibial support prosthesis, the end face of the tibia is usually partially resected to expose the cancellous bone. The support body is used to connect with the connected end face. The arcuate portion in this scheme can move from the distal bone side of the support body to the proximal bone side, and then insert into the cancellous bone of the tibia, which can avoid the tibial cortical damage caused by grooving on the front side of the tibia, and can also simplify the operation. In addition, the center line of the arcuate portion in its own longitudinal cross section is an arc, and when it is inserted into the tibia during the arcuate portion, it can move along the arcuate center line, which is conducive to the insertion process of the arcuate portion. In addition, after the arcuate portion is inserted into the tibia, the arcuate portion itself can contact the tibia in multiple directions, such as in the direction along the bone axis, and in multiple directions with an angle with the bone axis, so as to improve the stability of the prosthesis moving in the vertical direction and the front-back direction. And, the connector is provided with the support body, and when the arcuate portion is inserted into the tibia, the support body can be connected to the tibia. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 A schematic structural diagram of a tibial tray prosthesis provided in Example 1 of the present invention, wherein the connecting member is in a state before being connected to the tibia;

[0070] Figure 2 A schematic structural diagram of a tibial tray prosthesis provided in Example 1 of the present invention, wherein the connecting member is in a state after being connected to the tibia;

[0071] Figure 3 A schematic diagram of the structure of a connecting piece provided in Example 1 of the present invention;

[0072] Figure 4 A schematic diagram of the structure of a connecting piece provided in Example 1 of the present invention;

[0073] Figure 5 A schematic diagram of the structure of a connecting piece provided in Example 1 of the present invention;

[0074] Figure 6 This is a schematic diagram of a connection structure between a connecting member and a supporting body in Embodiment 1 of the present invention;

[0075] Figure 7 for Figure 6 A schematic cross-sectional view of the center support body;

[0076] Figure 8 for Figure 6 Schematic diagram of the top view of the mid-tibial tray prosthesis;

[0077] Fig. 9 This is a schematic diagram of another connection structure between the connecting member and the supporting body in Embodiment 1 of the present invention;

[0078] Fig.10 for Fig. 9A schematic cross-sectional view of the center support body;

[0079] Fig.11 for Fig. 9 Schematic diagram of the top view of the mid-tibial tray prosthesis;

[0080] Fig.12 It is a partial enlarged view of the connecting member in Example 1 of the present invention;

[0081] Fig.13 It is a partial cross-sectional schematic diagram of the connecting member and the support body in Example 1 of the present invention;

[0082] Fig.14 It is a partially enlarged schematic cross-sectional view of the connecting member and the support body in Embodiment 1 of the present invention;

[0083] Fig.15 This is a schematic diagram of the structure of the support body in Example 1 of the present invention;

[0084] Fig.16 A schematic diagram of the structure of a connecting piece provided in Example 2 of the present invention;

[0085] Fig.17 A schematic diagram of the structure of a support body provided in Example 2 of the present invention;

[0086] Fig.18 A schematic top view of a tibial tray prosthesis provided in Example 2 of the present invention;

[0087] Fig.19 A schematic structural diagram of a tibial tray prosthesis provided in Example 2 of the present invention;

[0088] Fig. 20 A schematic cross-sectional view of a tibial tray prosthesis provided in Example 2 of the present invention;

[0089] Fig.21 A schematic cross-sectional view of a tibial tray prosthesis provided in Example 2 of the present invention;

[0090] Fig. 22 A schematic cross-sectional view of a support body provided in Example 2 of the present invention;

[0091] Fig.23 A schematic cross-sectional view of a support body provided in Example 2 of the present invention;

[0092] Fig.24 A schematic diagram of the structure of a connecting piece provided in Example 3 of the present invention;

[0093] Fig.25 A schematic top view of a tibial tray prosthesis provided in Example 3 of the present invention;

[0094] Fig.26 A schematic cross-sectional view of a tibial tray prosthesis provided in Example 3 of the present invention;

[0095] Fig. 27 A schematic cross-sectional view of a tibial tray prosthesis provided in Example 3 of the present invention;

[0096] Fig.28 A schematic structural diagram of a tibial tray prosthesis provided in Example 4 of the present invention;

[0097] Fig.29 This is a schematic top view of the tibial tray prosthesis provided in Example 4 of the present invention.

[0098] Description of Reference Numerals

[0099] Tibial support prosthesis 1, support body 10, proximal bone side 11, distal bone side 12, mounting portion 13, first through slot 131, second through slot 132, third through slot 133, second limiting slot 134, edge portion 14, mounting hole 15, mounting slot 16, guide section 161, limiting section 162, limiting protrusion 163, abutment portion 17, slot 18, extension portion 19, connector 20, longitudinal portion 21, transverse portion 22, arc portion 1 00, sawtooth 110, limiting boss 120, clamping portion 130, rotating portion 210, first connecting portion 220, rib 221, recess 222, guide member 310, first guide surface 311, second guide surface 312, third guide surface 313, transition member 314, guide groove 320, second connecting portion 410, second limiting portion 420, porous structure 30, fixing pin 40, longitudinal groove 41, sawtooth 42. DETAILED DESCRIPTION

[0100] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0101] The embodiment of the present invention provides a tibial tray prosthesis 1, such as Figure 1-Figure 29 As shown, the tibial tray prosthesis 1 includes a tray body 10 and a connecting member 20. The tray body 10 has a proximal bone side 11 facing the connected end surface of the tibia and a distal bone side 12 away from the connected end surface of the tibia. The connecting member 20 is penetrated in the tray body 10 along the direction from the distal bone side 12 to the proximal bone side 11.

[0102] The connecting member 20 has an arcuate portion 100 , the center line of which in its longitudinal section is arc-shaped; the arcuate portion 100 is used to move from the distal bone side 12 of the supporting body 10 to the proximal bone side 11 so that the arcuate portion 100 is inserted into the tibia.

[0103] When installing the tibial tray prosthesis 1, a portion of the bone of the end surface of the tibia is usually removed to expose the cancellous bone. The tray body 10 is used to connect with the connected end surface. Specifically, the end surface of the tibia is usually cut into a plane, and the plane serves as the connected end surface of the tibia. Figure 1 and Figure 2 As shown, the surface of the support body 10 located on the proximal bone side 11 is generally a planar structure, and the surface of the proximal bone side 11 can cover and connect to the connected end surface of the tibia. The connector 20 passes through the support body 10, and when the arc portion 100 is inserted and anchored in the tibia, the support body 10 can be connected to the tibia. The arc portion 100 can move from the distal bone side 12 of the support body 10 to the proximal bone side 11, and then inserted into the cancellous bone of the tibia, which can avoid the damage to the tibial cortex caused by the conventional surgery of grooving the front side of the tibia, and can also use the cancellous bone exposed on the end surface after bone resection to directly connect with it, avoiding additional surgical operations, thereby simplifying the operation.

[0104] Among them, Figure 1 and Figure 2 As shown, the arc portion 100 is a solid structure arranged in the direction from the distal bone side 12 to the proximal bone side 11, and the longitudinal direction 21 refers to the corresponding direction of the arc portion 100 itself, specifically, roughly along the direction from the distal bone side 12 to the proximal bone side 11, which is also the direction in which the arc portion 100 moves when inserted into the tibia. When the prosthesis is connected to the tibia, it is usually arranged horizontally on the connected end surface of the tibia, and the arc portion 100 is arranged along the vertical direction. The longitudinal direction 21 is also the vertical direction when the prosthesis is connected to the tibia. In specific implementation, as Figure 3 and Figure 4 As shown, the arc portion 100 is provided in a symmetrical structure, and the symmetrical structure can improve the balance of the connection forces at various locations when the arc portion 100 is connected to the tibia, thereby further improving the stability of the connection. Figure 4 The longitudinal line 21 of the arc-shaped portion 100 at its symmetry plane is shown in FIG. Figure 3 and Figure 5 As shown, the arc portion 100 is a structure with a certain thickness, and the center line is a line passing through the center of each thickness position of the arc portion 100. The center line of the arc portion 100 in its own longitudinal cross section is an arc, and when the arc portion 100 is inserted into the tibia, it can move along the arc center line, which is beneficial to the insertion process of the arc portion 100.

[0105] When the arc portion 100 is inserted into the tibia, the arc portion 100 itself can not only increase the contact area with the tibia, but also can contact the tibia in multiple directions, such as along the bone axis and in multiple directions with an angle with the bone axis, so as to improve the stability of the prosthesis in the vertical direction and the front-back direction. Figure 2 As shown, when the arc portion 100 is inserted into and anchored in the tibia, the arc portion 100 is connected to the tibia in the vertical direction, the anterior-posterior direction, and the transition direction between the vertical direction and the anterior-posterior direction, thereby improving the stability of the connection with the tibia in multiple directions.

[0106] Furthermore, the center line of the arc portion 100 in its longitudinal section is a convex curve with a preset curvature. The center line of the arc portion 100 can have a variety of linear forms, and the convex curve can be easily inserted into the tibia and compacted and closely fitted with the cancellous bone of the tibia. The preset curvature is a curvature corresponding to the ability of the arc portion 100 to be implanted in the tibia, and those skilled in the art can design it according to needs.

[0107] Preferably, the arc portion 100 has an arc shape in the center line of its longitudinal cross section. When it is an arc shape, the arc portion 100 can rotate around a center of a circle with a uniform trajectory, and the arc portion 100 can be gradually inserted and anchored in the cancellous bone. Figure 5 As shown, the arc-shaped portion 100 with an arc-shaped center line can rotate around its center, and the trajectory of each position of the arc-shaped portion 100 is consistent. When it is inserted into the tibia, it can evenly compact the cancellous bone to avoid gaps.

[0108] In the following embodiments, a specific implementation of the connector 20 and the support body 10 is provided by taking the case where the center line of the arc portion 100 is an arc shape. However, in the specific implementation, those skilled in the art can set the arc portion 100 to other line shapes as needed. Therefore, the scope of protection of the present invention should not be limited to the following implementations.

[0109] Example 1

[0110] like Figure 1 and Figure 2 As shown, the connecting member 20 is rotatably connected to the support body 10, and the arcuate portion 100 rotates from the distal bone side 12 of the support body 10 to the proximal bone side 11 around the rotational connection between the connecting member 20 and the support body 10. During the operation of installing the tibial support prosthesis 1, the arcuate portion 100 of the connecting member 20 can be inserted into the cancellous bone at the connected end surface of the tibia around the rotational connection. This installation method is simple and easy to operate.

[0111] like Figure 5 As shown, when the center line of the arc-shaped portion 100 is an arc, the rotational connection point between the connecting member 20 and the supporting body 10 is preferably the center of the arc.

[0112] like Figure 1 , Figure 3 and Figure 4 As shown, the connecting member 20 also includes a rotating portion 210 and a first connecting portion 220. The rotating portion 210 is rotatably connected to the supporting body 10. The first connecting portion 220 extends between the rotating portion 210 and the arc portion 100, and the two ends of the first connecting portion 220 are respectively connected to the rotating portion 210 and the arc portion 100.

[0113] like Figure 1As shown, the connecting member 20 spans and penetrates the support body 10, and the rotating portion 210 and the arc portion 100 are respectively located at opposite ends of the support body 10. When the tibial support prosthesis 1 is connected to the tibia, the rotating portion 210 and the arc portion 100 can be connected to the support body 10 at opposite ends, so that the connection between the support body 10 and the tibia is more stable. Among them, the rotating portion 210 is preferably located at the center of the arc portion 100. When the arc portion 100 is inserted into the cancellous bone, it rotates around the rotating portion 210, and the implantation process is smoother. The first connecting portion 220 connects the arc portion 100 and the rotating portion 210, and extends between the arc portion 100 and the rotating portion 210 and spans the support body 10. Compared with the lateral dimension 22 of the arc portion 100 , the thickness of the first connection portion 220 is smaller than the lateral dimension 22 of the arc portion 100 , so that the opening of the hole on the support body 10 for the first connection portion 220 to pass through is smaller, reducing the impact on the structural strength of the support body 10 .

[0114] In specific implementation, the first connecting portion 220 may adopt a variety of structural forms. Two specific implementations are provided below, but the protection scope of the present invention should not be limited to the following implementations.

[0115] As a preferred implementation method, Figure 2 and Figure 5 As shown, the first connection portion 220 is a fan-shaped rib 221 , one end of the rib 221 is connected to the rotating portion 210 , and the other end is connected to the arc-shaped portion 100 along the outer contour of the arc-shaped portion 100 .

[0116] like Figure 5 , Figure 6 and Fig. 9 As shown, the rib 221 is connected from one end of the arc portion 100 to the other end of the arc portion 100 along the longitudinal direction 21 of the arc portion 100, which increases the connection length between the first connection portion 220 and the arc portion 100, improves the reliability of the overall structure of the connector 20, and when the arc portion 100 rotates around the rotating portion 210, the rotation process is smoother. In addition, the rib 221 structure can reduce the rotational displacement in all directions. In addition, when the arc portion 100 is connected to the inside of the tibia, the rib 221 is also inserted and anchored in the cancellous bone of the tibia, which increases the contact area between the connector 20 and the tibia, and further improves the stability of the connection. Furthermore, as Figure 4 As shown, the rib 221 is connected to the middle position of the arc portion 100, preferably connected to the position where the symmetry plane of the rib 221 is located.

[0117] like Figure 6 and Fig. 9 As shown, when the arc portion 100 moves to the proximal bone side 11 of the support body 10, the edge of the rib plate 221 facing the support body 10 has a recess 222. The recess 222 can form an escape space to avoid interference with the femoral condyle.

[0118] As another preferred embodiment, the first connecting portion 220 is a connecting rod (not shown in the figure), and there are multiple connecting rods, one end of each of the multiple connecting rods is connected to the rotating portion 210, and the other end is connected to the arc portion 100 at intervals along the outer contour of the arc portion 100. The multiple connecting rods can be connected to multiple positions of the outer contour of the arc portion 100, thereby improving the stability of the connection and improving the smoothness of the rotation process of the arc portion 100.

[0119] When the arc portion 100 moves to the proximal bone side 11 of the support body 10, a preset distance is provided between the connection rods close to the support body 10 among the plurality of connection rods and the support body 10, so as to form an avoidance space and avoid interference with the femoral condyle.

[0120] like Figure 3 and Figure 4 As shown, the rotating part 210 is cylindrical, and the rotating part 210 is arranged in the support body 10 along a direction parallel to the plane where the support body 10 is located, and the first connecting part 220 is perpendicular to the rotating part 210. The rotating part 210 is arranged in the support body 10, which can not only improve the stability of the connection with the support body 10, but also avoid occupying the external space of the support body 10, resulting in an increase in the volume of the prosthesis, or interference with other structures. In addition, the arrangement direction of the rotating part 210 is parallel to the plane where the support body 10 is located, and the space of the support body 10 itself can be used for setting, so that the structure of the prosthesis is compact. In addition, the first connecting part 220 is perpendicular to the rotating part 210, so that the connection between the arc part 100 and the rotating part 210 by the first connecting part 220 is more stable, and it is convenient for the first connecting part 220 to be inserted into the cancellous bone of the tibia.

[0121] like Figure 4 As shown, the first connecting portion 220 is connected to the outer wall of the cylindrical rotating portion 210, specifically connected to the middle position of the cylindrical rotating portion 210. Figure 3 and Figure 4 As shown, the connecting member 20 forms a symmetrical structure as a whole, the first connecting portion 220 is arranged at the symmetry plane of the connecting member 20, and the arc portion 100 and the rotating portion 210 both extend to both sides of the symmetry plane, thereby improving the balance and stability of the connection between the connecting member 20 and the tibia. Figure 5 As shown, the axis of the cylindrical rotating portion 210 coincides with the center of the arc-shaped arc portion 100 .

[0122] like Figure 6 and Fig. 9 As shown, the support body 10 is a plate-like structure with a certain thickness, including a mounting portion 13 and an edge portion 14. The connecting member 20 is connected to and penetrates the mounting portion 13. The edge portion 14 is located at the distal bone side 12 of the connecting member 20 and is connected to the mounting portion 13. Figure 1 As shown, the edge portion 14 is arranged around the edge of the mounting portion 13. In specific implementation, the connector 20 and the support body 10 can be integrated in a variety of ways. Two specific implementations will be provided below, but the protection scope of the present invention should not be limited to the following implementations.

[0123] As a preferred implementation method, Figure 6 , Figure 7 and Figure 8 As shown, the interior of the support body 10 has a mounting hole 15, and the rotating part 210 is arranged in the mounting hole 15. The support body 10 and the connecting member 20 can be integrated by 3D printing, and the rotating part 210 is embedded and limited in the mounting hole 15 of the support body 10, and the rotating part will not fall out of the mounting hole, thereby preventing the rotating part 210 from accidentally detaching from the support body 10, causing the connecting member 20 to separate from the support body 10.

[0124] like Figure 7 As shown, the mounting hole 15 is provided in the mounting portion 13. Figure 8 As shown, the mounting portion 13 is provided with a first through slot 131 for the arc portion 100 and the first connecting portion 220 to pass through, and the first through slot 131 is T-shaped.

[0125] As another preferred implementation, Fig. 9 , Fig.10 and Fig.11 As shown, the support body 10 has a mounting groove 16, and the mounting groove 16 extends from the surface of the support body 10 on the distal bone side 12 to the proximal bone side 11 of the support body 10; and the mounting groove 16 includes a guide section 161 and a limit section 162, the guide section 161 is inclined from the distal bone side 12 to the proximal bone side 11, and the limit section 162 has a limit protrusion 163 at the junction of the guide section 161, and the rotating part 210 is arranged in the limit section 162. The surface of the support body 10 is provided with a mounting groove 16, and the rotating part 210 and the support body 10 can be separately provided and then installed as a whole, so that the connecting member 20 and the support body 10 can be made separately and then installed as a whole. Among them, when the rotating part 210 is installed in the support body 10, the rotating part 210 can enter the mounting groove 16 from the guide section 161 and move to the limit section 162; when the rotating part 210 is installed, the limit protrusion 163 can limit the position of the connecting member 20.

[0126] like Fig.10As shown, the limiting section 162 is arranged near the edge of the mounting portion 13, the guiding section 161 is inclined toward the edge of the mounting portion 13, and the limiting protrusion 163 is arranged on the distal bone side 12 of the mounting portion 13. This structural arrangement can limit the rotating portion 210 in the mounting groove 16 without using additional components. In other embodiments, the mounting groove 16 can also be installed in other structural forms, or the mounting groove 16 can be installed in a manner that cooperates with other components to achieve the installation of the rotating portion 210. Fig.11 As shown, the mounting groove 16 is opened on the surface of the distal bone side 12 of the mounting portion 13 .

[0127] When the rotating portion 210 is installed in the support body 10 , the connecting member 20 can be rotatably connected to the support body 10 through the rotating portion 210 , so that the arc portion 100 can rotate around the rotating portion 210 to be inserted into the tibia.

[0128] like Figure 3 and Figure 4 As shown, along the direction from the distal bone side 12 to the proximal bone side 11, the lateral dimension 22 of the arc-shaped portion 100 gradually decreases, as shown in FIG. Figure 5 As shown, the thickness of the arc portion 100 gradually decreases. The transverse direction 22 and the longitudinal direction 21 are two mutually perpendicular directions. The arc portion 100 adopts the above structural form, which forms a double-taper design, so that the arc portion 100 has a better and more stable press-fit effect when implanted. At the same time, it can provide a tight compression force for the tibial tray.

[0129] like Figure 3 and Figure 4 As shown, the lateral dimension 22 of one end of the arc-shaped portion 100 is the largest, and the lateral dimension 22 gradually decreases from this end until the other end thereof is a pointed tip, which facilitates the arc-shaped portion 100 to be inserted into the tibia. Figure 5 As shown, the arc portion 100 has the largest thickness at the position where the lateral dimension 22 thereof is the largest, and the thickness gradually decreases from this end until it becomes the smallest tip at the other end. The overall structure of the arc portion 100 forms a double-tapered structure in which the dimension and thickness of one end are the largest and gradually decrease to the smallest dimension and thickness of the other end.

[0130] like Figure 3 , Figure 4 and Figure 5 As shown, the surface and side of the arc portion 100 are provided with saw teeth 110, and the tooth tips of the saw teeth 110 face the direction where the tibia is located. This can facilitate the implantation of the arc portion 100 into the tibia and improve the anti-exit performance of the arc portion 100.

[0131] like Figure 2 and Figure 3As shown, the surface of the arc portion 100 away from the rotating portion 210 and the surface close to the rotating portion 210 are provided with saw teeth 110, and the tooth pitch is arranged along the lateral direction 22 of the arc portion 100. Figure 3 and Figure 4 As shown, saw teeth 110 are provided on both sides of the arc portion 100 .

[0132] like Fig.12 and Fig.13 As shown, the side of the end of the arc portion 100 away from the tibia is provided with a limiting boss 120, and the surface of the support body 10 located on the distal bone side 12 is provided with a first limiting groove, which is used to limit the limiting boss 120 from moving in the direction where the tibia is located. The limiting boss 120 can prevent the arc portion 100 from excessively sinking when the connector 20 is implanted.

[0133] like Fig.12 As shown, both sides of the arc-shaped portion 100 are provided with limiting protrusions 163, and the limiting protrusions 163 extend laterally 22 from the side surface of the arc-shaped portion 100. Fig.13 As shown, the through slot on the mounting portion 13 through which the arc portion 100 passes is provided with an abutment portion 17 abutting against the limiting protrusion 163 . When the connecting member 20 is connected to the inside of the tibia, the limiting protrusion 163 abuts against the abutment portion 17 .

[0134] like Fig.12 and Fig.14 As shown, the end of the arc portion 100 away from the tibia is provided with a clamping portion 130, and the surface of the support body 10 located on the proximal bone side 11 is provided with a clamping groove 18, and the clamping portion 130 is clamped in the clamping groove 18. When the connecting member 20 is implanted in the cancellous bone, the clamping portion 130 is clamped in the clamping groove 18, which can prevent the arc portion 100 from withdrawing from the tibia.

[0135] like Fig.12 As shown, a plurality of clamping portions 130 are provided at the end of the arc-shaped portion 100, and the plurality of clamping portions 130 are arranged at intervals along the lateral direction 22 of the arc-shaped portion 100. Fig.14 As shown, the engaging portion 130 is a hook, and there is a gap between the engaging portion 130 and the arc-shaped portion 100. When the arc-shaped portion 100 moves toward the tibia, the engaging portion 130 can be compressed to enter the slot 18. After the engaging portion 130 enters the slot 18, the engaging portion 130 can return to its original state and engage with the slot 18.

[0136] In a specific implementation, at least one of the surface of the arc portion 100, the first connection portion 220 of the connector 20, and the surface of the support body 10 located on the proximal bone side 11 is provided with a porous structure 30. The porous structure 30 provides a rough surface, improves the initial stability of the connector 20 and the support body 10 with the bone, and quickly achieves bone ingrowth, thereby improving the mid- and long-term stability of the connector 20. The porosity of the trabecular porous structure 30 is 50% to 95%, and the pore size is 100 to 1000 um.

[0137] like Figure 3 and Figure 4 As shown, both the surface of the arc portion 100 away from the rotating portion 210 and the surface facing the rotating portion 210 may be provided with a porous structure 30. Figure 2 As shown, both sides of the first connecting portion 220 may be provided with a porous structure 30. Figure 2 As shown, the surface of the bone-proximal side 11 of the support body 10 is provided with the porous structure 30 .

[0138] In a specific implementation, the connector 20 may have one or more arc-shaped portions 100. When there are multiple arc-shaped portions 100, the multiple arc-shaped portions 100 are arranged in sequence. Multiple arc-shaped portions 100 can further improve the fixation stability, and multiple arc-shaped portions 100 are arranged in sequence in sequence. During surgical implantation, multiple arc-shaped portions 100 can be connected to cancellous bone through a single implantation.

[0139] The curvatures of the multiple arc-shaped portions 100 at corresponding positions are the same, so that the trajectories of the multiple arc-shaped portions 100 are consistent, which is convenient for implantation. Figure 5 As shown, the two arc-shaped portions 100 are both arc-shaped, and the rotation centers of the two arc-shaped portions 100 coincide with each other, and both coincide with the axis of the rotating portion 210. In addition, the longitudinal dimension 21 of the arc-shaped portion 100 close to the rotating portion 210 may be smaller than the longitudinal dimension 21 of the arc-shaped portion 100 away from the rotating portion 210. The arc-shaped portion 100 away from the rotating portion 210 is disposed at the end of the first connecting portion 220, and the arc-shaped portion 100 close to the rotating portion 210 is disposed on the first connecting portion 220.

[0140] like Fig.13 and Fig.15 As shown, the tibial tray prosthesis 1 further includes a fixing nail 40, which is connected to the surface of the tray body 10 on the proximal bone side 11 and is located on both sides of the arc portion 100; along the axial direction of the fixing nail 40, the outer surface of the fixing nail 40 is provided with a plurality of longitudinal grooves 41; along the circumferential direction of the fixing nail 40, the outer surface of the fixing nail 40 is provided with a plurality of saw teeth 42. The fixing nail 40 can play an early fixing role, and the fixing effect of the fixing nail 40 can be improved through the above structural forms of the fixing nail 40.

[0141] like Fig.15As shown, the fixing nail 40 is a columnar structure as a whole, and the fixing nail 40 and the support body 10 are arranged obliquely, thereby further improving the connection performance between the support body 10 and the tibia. Fig.15 The tooth tips of the saw teeth 42 face toward the tibia, thereby further improving the anti-depression performance of the fixing nail 40. Fig.13 As shown, both sides of the arc portion 100 are provided with fixing pins 40, and Fig.15 As shown, two fixing nails 40 can be arranged front and back. In addition, the fixing nail 40 can be a full solid structure, or a porous and solid combined structure.

[0142] Example 2

[0143] like Figure 16-Figure 23 As shown, this embodiment provides another connection method between the connector 20 and the support body 10. The difference between this embodiment and embodiment 1 is that the connector 20 in this embodiment is slidably connected to the support body 10, and the arcuate portion 100 slides from the distal bone side 12 to the proximal bone side 11 of the support body 10 along the sliding path of the connector 20 and the support body 10. During the operation of installing the tibial support prosthesis 1, the arcuate portion 100 of the connector 20 can be inserted into the cancellous bone at the connected end surface of the tibia along the sliding path of the connector 20 on the support body 10. This installation method is simple and easy to operate.

[0144] In a specific implementation, the tibial tray prosthesis 1 further includes a guide member 310 and a guide groove 320. One of the arc-shaped portion 100 and the tray body 10 is connected with the guide member 310, and the other is provided with the guide groove 320. The guide member 310 and the guide groove 320 are slidably matched. The cooperation between the guide groove 320 and the guide member 310 forms a sliding path for the connector 20 to move relative to the tray body 10. The structure is simple, and the connector 20 can be connected to the cancellous bone along the sliding path, which is easy to operate.

[0145] The following takes the example that the guide member 310 is disposed on the arc portion 100 and the guide groove 320 is disposed on the support body 10 to further illustrate the embodiment of the present invention. In other embodiments, the guide member 310 may also be disposed on the support body 10 and the guide groove 320 may be disposed on the arc portion 100, and those skilled in the art may configure them according to requirements.

[0146] like Fig.16 and Fig.17As shown, the guide member 310 is connected to the arc portion 100, and the guide groove 320 is penetrated through the support body 10 along the direction from the distal bone side 12 to the proximal bone side 11, and the extension direction of the guide member 310 and the guide track of the guide groove 320 are both adapted to the center line of the arc portion 100. The arc portion 100 can move along the guide track of the guide groove 320 through the guide member 310, thereby improving the stability and accuracy of the movement of the arc portion 100. In addition, the extension direction of the guide member 310 and the guide track of the guide groove 320 are adapted to the arc portion 100, so that the sliding path of the arc portion 100 is consistent with its own structure, which is conducive to the smooth insertion of the arc portion 100. Among them, the extension direction of the guide member 310 and the guide track of the guide groove 320 are both adapted to the center line of the arc portion 100, so that the curvature of the corresponding positions of the guide member 310 and the guide groove 320 are the same as the curvature of the corresponding positions on the center portion of the arc portion 100. As shown Fig.21 As shown, when the arc-shaped portion 100 is in an arc shape, the extension direction of the guide member 310 and the guide track of the guide groove 320 are also in an arc shape.

[0147] like Fig.16 As shown, the guide member 310 includes a first guide surface 311, a second guide surface 312 and a third guide surface 313. The first guide surface 311 is arranged at a distance from the arc portion 100, and the second guide surface 312 and the third guide surface 313 are arranged on both sides of the first guide surface 311 and connected to the arc portion 100. The guiding stability of the guide member 310 can be improved. Fig.18 As shown, the connection position between the guide member 310 and the arc portion 100 is located in the middle of the arc portion 100. The second guide surface 312 and the third guide surface 313 are connected to the inner side surface of the arc portion 100. The first guide surface 311, the second guide surface 312 and the third guide surface 313 can form a variety of cross-sectional forms, such as a rectangle, a triangle, etc. In other embodiments, the guide member 310 can also have more guide surfaces, thereby further increasing the guide area and improving the stability of the guide.

[0148] like Fig.16 and Fig.18 As shown, the first guide surface 311, the second guide surface 312 and the third guide surface 313 form a triangular structure in cross section. The cross section of the guide member 310 is a triangular structure, and one of the tips of the triangle faces the arc portion 100 and is used to connect with the arc portion 100, so as to improve the stability of the guide member 310 at various locations close to the arc portion 100 and away from the arc portion 100.

[0149] like Fig.16 and Fig.18As shown, the tip between the second guide surface 312 and the third guide surface 313 faces the arc-shaped portion 100, and the second guide surface 312 and the third guide surface 313 are connected to the arc-shaped portion 100 through a strip-shaped transition piece 314. The cross-section of the transition piece 314 is rectangular, and its size is smaller than the structure formed by the first guide surface 311, the second guide surface 312 and the third guide surface 313. The transition piece 314 can improve the connection strength between the guide piece 310 and the arc-shaped portion 100. And the transition piece 314 can also play a guiding role to improve the guiding performance. Fig.16 As shown, each edge of the guide member 310 is provided with a chamfer.

[0150] like Fig.17 As shown, the mounting portion 13 of the support body 10 has a second through slot 132 , which is compatible with the structure of the connecting member 20 , wherein the second through slot 132 is provided with a guide slot 320 , and the inner side wall of the guide slot 320 is in contact with each guide surface of the guide member 310 .

[0151] like Fig. 22 and Fig.23 As shown, the support body 10 is provided with an extension portion 19 on the surface of the proximal bone side 11, and the guide groove 320 runs through the support body 10 and the extension portion 19. The length of the guide groove 320 can be extended, the guide area is increased, and the guide performance is improved.

[0152] like Fig. 20 As shown, when the arc portion 100 is connected to the tibia, the extension portion 19 also fits with the guide member 310, which can improve the connection performance between the arc portion 100 and the support body 10. In addition, after the arc portion 100 is connected to the tibia, the arc portion 100 can be located below the surface of the distal bone side 12 of the support body 10.

[0153] The structure of the arc portion 100 in this embodiment is basically the same as that in the embodiment 1, and it also has the limiting boss 120, the clamping portion 130, the sawtooth 110 and the porous structure 30, and can also be formed into a double-tapered design. In addition, the structure of the support body 10 is basically the same as that in the embodiment 1, and can also be equipped with a fixing nail 40.

[0154] Example 3

[0155] like Figure 24-Figure 27As shown, the connecting member 20 in this embodiment is slidably connected to the support body 10. Based on the embodiment 2, the tibial support prosthesis 1 in this embodiment further includes a second connecting portion 410 and a second limiting portion 420. The second connecting portion 410 is connected to the guide member 310 and extends in a direction away from the arc-shaped portion 100. The second limiting portion 420 is arranged at the extending edge of the second connecting portion 410 toward the support body 10. The support body 10 is provided with a second limiting groove 134. The second limiting portion 420 is engaged in the second limiting groove 134. The trajectory of the second limiting groove 134 is adapted to the center line of the arc-shaped portion 100. The second limiting portion 420 can limit the maximum sliding distance of the arc-shaped portion 100 relative to the support body 10, so as to avoid the arc-shaped portion 100 from moving too far, and can increase the connection strength between the arc-shaped portion 100 and the support body 10. The second connecting portion 410 serves as a connecting component between the second limiting portion 420 and the arc portion 100, and can also play a guiding role, thereby increasing the contact range between the arc portion 100 and the support body 10, as well as increasing the contact area between the arc portion 100 and the cancellous bone, thereby improving the connection performance with the support body 10 and the cancellous bone.

[0156] like Fig.24 As shown, the second connecting portion 410 is connected to the first guide surface 311 of the guide member 310, as shown in FIG. Fig.25 As shown, the connecting member 20 spans and penetrates the support body 10, the arc portion 100 can be connected to the support body 10 through the limiting boss 120 and the clamping portion 130, and the second limiting portion 420 can increase the connection points with the support body 10 at multiple positions of the second connecting portion 410, and the second connecting portion 410 is connected to the arc portion 100 and the guide member 310, so as to improve the connection performance of the connecting member 20 as a whole with the support body 10, and improve the stability of the connection between the prosthesis and the tibia. Fig.25 As shown, the support body 10 is provided with a third through slot 133, which has a structure similar to the second through slot 132, and further has a second limiting slot 134. Fig. 27 As shown, the moving trajectory of the second limiting portion 420 and the trajectory of the second limiting groove 134 are all arc-shaped as well as the center line of the arc portion 100, and the centers of the three coincide. When the arc portion 100 moves and is inserted into the tibia, the second limiting portion 420 can also be smoothly engaged in the second limiting groove 134.

[0157] like Fig.24 As shown, the second connection portion 410 is a rib plate 221, the second limiting portion 420 is cylindrical, and the plane where the second connection portion 410 is located is perpendicular to the axis of the second limiting portion 420. The structure is simple, and the rib plate 221 can further increase the strength of the overall structure, and the cylindrical shape and the rib plate 221 can form a clamping structure, which is clamped in the second limiting groove 134 of the support body 10.

[0158] like Fig.24 and Fig.25 As shown, the connecting member 20 is a roughly symmetrical structure, the second connecting portion 410 is located at the position of the symmetry plane, and the cylindrical second limiting portion 420 extends to both sides along the symmetry plane, so as to balance the connection force between the connecting member 20 and the supporting body 10.

[0159] In a specific implementation, the number of the second limiting portion 420 is at least one. Fig.24 and Fig. 27 As shown, when there are multiple second limiting portions 420, the multiple second limiting portions 420 are arranged at intervals along the extended edge of the second connecting portion 410. The multiple second limiting portions 420 arranged at intervals can be connected to the support body 10 at multiple positions of the connecting member 20, thereby improving the overall structural strength after the connecting member 20 is connected to the support body 10, making the overall structure more stable.

[0160] When there is one second limiting portion 420, the second limiting portion 420 is preferably located at two ends of the connecting member 20 and the arc portion 100, respectively, so that the two ends of the connecting member 20 can be connected to the supporting body 10. Fig. 27 As shown, when there are multiple second limiting portions 420, one of them and the arc portion 100 are respectively arranged at the two ends of the connecting member 20, and the second limiting portion 420 is arranged between the arc portion 100 and the opposite end. Further, the second limiting portion 420 located at the end may also coincide with the center of the arc portion 100.

[0161] like Fig.26 As shown, when the arc portion 100 moves to the proximal bone side 11 of the support body 10, the edge of the second connection portion 410 facing the support body 10 has a recess 222, and the second limiting portion 420 is disposed in the recess 222. An avoidance space can be formed to avoid interference with the femoral condyle.

[0162] In specific implementation, the surface of the arc portion 100 away from the rotating portion 210 and the surface facing the rotating portion 210 can be provided with a porous structure 30. The porous structure 30 can be provided on both sides of the second connecting portion 410. The surface of the proximal side 11 of the support body 10 is provided with the porous structure 30.

[0163] Example 4

[0164] The present embodiment provides another tibial tray prosthesis 1, in which there are multiple connectors 20, and the multiple connectors 20 are arranged at intervals on the tray body 10. For surgeries with a larger implantation space, such as implantation of a tibial tray prosthesis 1 for a total knee joint, the stability of the connection between the prosthesis and the bone can be further improved by using multiple connectors 20. The connector 20 and the tray body 10 in the present embodiment can adopt any one of the structural forms in the above embodiments 1, 2 and 3, or some of the connectors 20 can adopt one of the structural forms in the above embodiments 1, 2 and 3, and the other part of the connectors 20 can adopt other structural forms in the above embodiments 1, 2 and 3.

[0165] like Fig.28 and Fig.29 As shown, the connecting member 20 and the support body 10 in the tibial tray prosthesis 1 adopt the structural form of the above embodiment 1, and the tibial tray prosthesis 1 has two connecting members 20, the two connecting members 20 are arranged side by side, and the arc-shaped portions 100 of the two connecting members 20 are both located at the same end of the support body 10. In other embodiments, the arc-shaped portions 100 of the two connecting members 20 can also be located at both ends of the support body 10, respectively, so that the structure of the prosthesis can be more compact.

[0166] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A tibial tray prosthesis, characterized in that: The tibial tray prosthesis comprises a tray body and a connecting piece. The support body has a proximal bone side facing the connected end surface of the tibia and a distal bone side away from the connected end surface of the tibia, and the connecting member is penetrated through the support body along the direction from the distal bone side to the proximal bone side; The connecting member has an arc-shaped portion, the center line of which in its longitudinal section is arc-shaped; the arc-shaped portion is used to move from the distal bone side to the proximal bone side of the support body so that the arc-shaped portion is inserted into the tibia.

2. The tibial tray prosthesis according to claim 1, characterized in that: The connecting member is rotatably connected to the support body, and the arc-shaped portion rotates from the distal bone side to the proximal bone side of the support body around the rotational connection between the connecting member and the support body.

3. The tibial tray prosthesis according to claim 2, characterized in that: The connecting member further comprises a rotating part and a first connecting part. The rotating part is rotatably connected in the supporting body. The first connecting part extends between the rotating part and the arc-shaped part. Two ends of the first connecting part are respectively connected to the rotating part and the arc-shaped part.

4. The tibial tray prosthesis according to claim 3, characterized in that: The first connecting portion is a fan-shaped rib plate, one end of the rib plate is connected to the rotating portion, and the other end is connected to the arc portion along the outer contour of the arc portion; Alternatively, the first connecting portion is a connecting rod, and there are multiple connecting rods, one end of each of the multiple connecting rods is connected to the rotating portion, and the other end is connected to the arc-shaped portion at intervals along the outer contour of the arc-shaped portion.

5. The tibial tray prosthesis according to claim 4, characterized in that: The first connecting portion is a rib plate, and when the arc-shaped portion moves to the proximal bone side of the support body, the edge of the rib plate facing the support body has a depression; Alternatively, the first connecting portion is a connecting rod, and when the arc-shaped portion moves to the proximal bone side of the support body, a connecting rod among the plurality of connecting rods close to the support body has a preset distance from the support body.

6. The tibial tray prosthesis according to claim 1, characterized in that: The connecting piece is slidably connected to the support body, and the arc portion slides along a sliding path of the connecting piece and the support body from the distal bone side to the proximal bone side of the support body.

7. The tibial tray prosthesis according to claim 6, characterized in that: The tibial tray prosthesis further comprises a guide member and a guide groove. One of the arc-shaped portion and the tray body is connected with the guide member, and the other is provided with the guide groove. The guide member and the guide groove are slidably matched.

8. The tibial tray prosthesis according to claim 7, characterized in that: The guide member is connected to the arc-shaped portion, and the guide groove is provided through the support body along the direction from the distal bone side to the proximal bone side. The extension direction of the guide member and the guide track of the guide groove are both adapted to the center line of the arc-shaped portion.

9. The tibial tray prosthesis according to any one of claims 1 to 8, characterized in that: The arc-shaped portion has a circular arc shape at the center line of its longitudinal cross section; Alternatively, the arc-shaped portion has a convex curve having a preset curvature at a center line of its longitudinal cross section.

10. The tibial tray prosthesis according to any one of claims 1 to 8, characterized in that: Along the direction from the distal bone side to the proximal bone side, the transverse dimension of the arc-shaped portion gradually decreases, and the thickness of the arc-shaped portion gradually decreases; And / or, the surface and side edges of the arc-shaped portion are provided with saw teeth, and the tips of the saw teeth face the direction of the tibia.

11. The tibial tray prosthesis according to any one of claims 1 to 8, characterized in that: A limiting boss is provided on the side of the end of the arc-shaped portion away from the tibia, and a first limiting groove is provided on the surface of the support body located on the distal bone side, and the first limiting groove is used to limit the movement of the limiting boss toward the direction where the tibia is located; And / or, a clamping portion is provided at the end of the arc-shaped portion away from the tibia, and a clamping groove is provided on the surface of the support body located on the proximal bone side, and the clamping portion is clamped in the clamping groove.

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