Tibial prosthesis

Abstract

This invention provides a tibial prosthesis, comprising a tibial plateau with a receiving groove and a connecting groove. The receiving groove communicates with the upper surface of the tibial plateau, and the connecting groove connects the bottom wall of the receiving groove and the lower surface of the tibial plateau. A spacer structure is buoyantly disposed within the receiving groove in a vertical direction. A bone growth body is connected below the spacer structure and located within the connecting groove. When the spacer structure floats vertically, it can drive the bone growth body downward through the tibial plateau. The technical solution of this application can effectively solve the problem of the long time required for the patient's bone to integrate with the prosthesis in related technologies.

Description

Technical Field

[0001] This invention relates to the field of prosthesis technology, and more specifically, to a tibial prosthesis. Background Technology

[0002] When irreversible damage to the tibial plateau articular surface occurs due to osteoarthritis, rheumatoid arthritis, trauma, or other reasons, it often leads to knee joint dysfunction. In this case, implanting a tibial joint prosthesis to replace the damaged articular surface becomes the most effective treatment for restoring joint function, eliminating pain, and improving quality of life.

[0003] To ensure the stability of tibial prostheses after implantation, trabecular bone structures are typically incorporated into the prosthesis to guarantee the stability of the connection between the prosthesis and the patient's healthy bone. However, bone ingrowth takes time, and the stability of the prosthesis for a period of time after implantation is difficult to guarantee. Summary of the Invention

[0004] The main objective of this invention is to provide a tibial prosthesis to solve the problem of the long time required for the patient's bone to integrate with the prosthesis in related technologies.

[0005] To achieve the above objectives, the present invention provides a tibial prosthesis, comprising: a tibial plateau having a receiving groove and a connecting groove, the receiving groove being connected to the upper surface of the tibial plateau, and the connecting groove being connected to the bottom wall of the receiving groove and the lower surface of the tibial plateau; a pad structure being floatably disposed in the receiving groove in the vertical direction; and a bone growth body being connected below the pad structure and located in the connecting groove, wherein when the pad structure floats in the vertical direction, it can drive the bone growth body downward through the tibial plateau.

[0006] Furthermore, the pad structure includes a pad body and a wing plate disposed on the side of the pad body. The receiving groove includes a main groove and a limiting groove located on the side of the main groove. The pad body is located in the main groove and protrudes upward from the tibial plateau. The wing plate is located in the limiting groove and cooperates with the upper groove wall of the limiting groove.

[0007] Furthermore, the gasket structure also includes an elastic element, which is disposed between the gasket body and the bottom wall of the main groove and / or between the wing plate and the bottom wall of the limiting groove, and applies an upward force to the gasket body and / or the wing plate.

[0008] Furthermore, the tibial prosthesis also includes a connecting post and a micro-moving body. The connecting post is located below the tibial plateau, and a first guide groove is provided on the tibial plateau. A second guide groove is provided on the connecting post. The first guide groove is connected to both the receiving groove and the second guide groove. The micro-moving body is located in the first guide groove and the second guide groove and is connected to the pad structure. The micro-moving body extends downward from the tibial plateau and outward from the connecting post. When the pad structure floats in the vertical direction, it can drive the micro-moving body to float synchronously.

[0009] Furthermore, the tibial prosthesis also includes a connecting tube, in which a connecting post is inserted. The connecting tube has a contracted state and an expanded state. When the connecting post is inserted into the connecting tube, the connecting tube remains in the expanded state.

[0010] Furthermore, the connecting cylinder is provided with a clearance groove, through which the micro-moving body extends outward from the connecting cylinder.

[0011] Furthermore, the connecting cylinder includes an expanding outer cylinder, which includes a plurality of expanding plates arranged along the circumferential direction of the connecting cylinder. When the connecting cylinder is in a contracted state, adjacent expanding plates are in contact. During the process of inserting the connecting column into the connecting cylinder, the connecting column pushes the expanding plates outward, so that the connecting cylinder switches from a contracted state to an expanded state.

[0012] Furthermore, the connecting cylinder also includes a fixed inner cylinder and multiple connecting rods. The fixed inner cylinder is set inside the expanding outer cylinder, and each expanding plate is connected to the fixed inner cylinder through a connecting rod. The two ends of the connecting rod are respectively hinged to the fixed inner cylinder and the expanding plate.

[0013] Furthermore, the connecting column includes a first column portion and a second column portion. The first column portion is located between the tibial plateau and the second column portion. When the connecting column is inserted into the connecting cylinder, the second column portion is fixedly inserted into the fixed inner cylinder, and the first column portion is supported on the inner side of the expansion plate so that the connecting cylinder remains in the expanded state.

[0014] Furthermore, the first column and / or the expansion plate are provided with an expansion ramp, which is inclined outward in the direction from bottom to top; and / or, the second column is provided with an anti-rotation wing, and the fixed inner cylinder is provided with an anti-rotation groove, so that when the connecting column is inserted into the connecting cylinder, the anti-rotation wing is inserted into the anti-rotation groove.

[0015] Furthermore, the expansion plate is provided with a first hinge groove, the outer end of the connecting rod is hinged to the first hinge groove, and a fixing protrusion is provided on the outer end face of the connecting rod. When the connecting cylinder is in a contracted state, the fixing protrusion is located in the first hinge groove, and when the connecting cylinder is in an expanded state, the fixing protrusion extends outward from the expansion plate; and / or, the fixed inner cylinder is provided with a second hinge groove, and the inner end of the connecting rod is hinged to the second hinge groove.

[0016] By applying the technical solution of this invention, the spacer structure is buoyantly disposed on the tibial plateau in the vertical direction. The bone growth body is connected below the spacer structure. When the spacer structure floats, it causes the bone growth body to float synchronously, allowing the bone growth body to penetrate downwards through the tibial plateau. As the bone growth body moves downwards, it applies mechanical stimulation to the patient's healthy bone, promoting bone growth. This allows the patient's bone to integrate with the bone growth body in a relatively short time, thus achieving a stable connection between the tibial prosthesis and the patient's healthy bone as quickly as possible. Therefore, the technical solution of this application can effectively solve the problem of the long integration time required between the patient's bone and the prosthesis in related technologies. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the tibial prosthesis according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 Enlarged view of point A on the tibial prosthesis;

[0020] Figure 3 It shows Figure 1 A three-dimensional structural diagram of the tibial plateau and connecting column of the tibial prosthesis;

[0021] Figure 4 It shows Figure 3 A three-dimensional structural diagram of the tibial plateau and connecting column from another angle;

[0022] Figure 5 It shows Figure 3 A cross-sectional schematic diagram of the tibial plateau and connecting column;

[0023] Figure 6 It shows Figure 3 A three-dimensional structural diagram of the tibial plateau;

[0024] Figure 7 It shows Figure 1 A schematic diagram of the pad structure and three-dimensional structure of the bone growth body of the tibial prosthesis;

[0025] Figure 8 It shows Figure 7 A three-dimensional structural diagram of the pad structure and the bone growth body from another angle;

[0026] Figure 9 It shows Figure 1 A three-dimensional structural diagram of the connecting tube of the tibial prosthesis;

[0027] Figure 10 It shows Figure 9 Enlarged view of point B on the connecting cylinder;

[0028] Figure 11 It shows Figure 9 A three-dimensional structural diagram of the fixed inner cylinder and connecting rod of the connecting cylinder;

[0029] Figure 12 It shows Figure 1 A three-dimensional structural diagram of the micro-motion body of the tibial prosthesis.

[0030] The above figures include the following reference numerals:

[0031] 10. Tibial plateau; 11. Receiving groove; 111. Main body groove; 112. Limiting groove; 1121. First limiting groove; 1122. Second limiting groove; 12. Connecting groove; 13. First guide groove;

[0032] 20. Gasket structure; 21. Gasket body; 22. Wing plate; 221. First wing plate; 222. Second wing plate; 23. Elastic element;

[0033] 30. Bone growth plates;

[0034] 40. Connecting post; 41. Second guide groove; 42. First column section; 421. Expanding ramp; 43. Second column section; 431. Anti-rotation side wing;

[0035] 50. Micro-movements;

[0036] 60. Connecting cylinder; 61. Clearance groove; 62. Expanding outer cylinder; 621. Expanding plate; 6211. First hinge groove; 63. Fixed inner cylinder; 631. Anti-rotation groove; 632. Second hinge groove; 64. Connecting rod; 641. Fixed protrusion;

[0037] a. Up and down direction. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0041] like Figures 1 to 8 As shown, this application provides a tibial prosthesis. An embodiment of the tibial prosthesis of this application includes a tibial plateau 10, a pad structure 20, and a bone growth body 30. The tibial plateau 10 has a receiving groove 11 and a connecting groove 12. The receiving groove 11 is connected to the upper surface of the tibial plateau 10, and the connecting groove 12 connects the bottom wall of the receiving groove 11 and the lower surface of the tibial plateau 10. The pad structure 20 is floatably disposed in the receiving groove 11 along the vertical direction a. The bone growth body 30 is connected below the pad structure 20 and located in the connecting groove 12. When the pad structure 20 floats along the vertical direction a, it can drive the bone growth body 30 downward through the tibial plateau 10.

[0042] Using the technical solution of this embodiment, the spacer structure 20 is buoyantly disposed on the tibial plateau 10 along the vertical direction a. The bone growth body 30 is connected below the spacer structure 20. When the spacer structure 20 floats, it causes the bone growth body 30 to float synchronously, allowing the bone growth body 30 to penetrate downwards through the tibial plateau 10. As the bone growth body 30 moves downwards, it applies mechanical stimulation to the patient's healthy bone, promoting bone growth. This allows the patient's bone to integrate with the bone growth body 30 in a relatively short time, thus achieving a stable connection between the tibial prosthesis and the patient's healthy bone as quickly as possible. Therefore, the technical solution of this embodiment can effectively solve the problem of the long integration time required between the patient's bone and the prosthesis in related technologies.

[0043] The tibial platform 10 can be a porous structure made of materials such as titanium alloy and tantalum metal through 3D printing, and the tibial platform 10 can be anodized.

[0044] The tibial prosthesis provided in this embodiment has a bone contact surface that is anatomically matched to the patient's knee joint, and its shape can be designed according to the human knee joint.

[0045] like Figures 3 to 8 As shown, the pad structure 20 includes a pad body 21 and a wing plate 22 disposed on the side of the pad body 21. The receiving groove 11 includes a main groove 111 and a limiting groove 112 located on the side of the main groove 111. The pad body 21 is located in the main groove 111 and protrudes upward from the tibial plateau 10. The wing plate 22 is located in the limiting groove 112 and engages with the upper groove wall of the limiting groove 112. The pad body 21 is located in the main groove 111 and protrudes upward from the tibial plateau 10. During daily activities such as walking and knee flexion, the femoral side can apply downward pressure to the pad body 21, thereby causing the pad structure 20 to drive the bone growth body 30 to move downward to apply mechanical stimulation to the patient's bone, thereby promoting bone growth. The wing plate 22 is located in the limiting groove 112 and engages with the upper groove wall of the limiting groove 112, which can limit the pad structure 20 from detaching upward from the tibial plateau 10, so as to ensure the overall structural stability of the tibial prosthesis.

[0046] Among them, the gasket body 21 and the wing plate 22 are formed by processing high molecular materials such as ultra-high molecular weight polyethylene; the bone growth body 30 is a porous structure formed by processing titanium alloy or magnesium alloy through 3D printing.

[0047] To avoid stress shielding and subsequent bone resorption due to stiffness differences between the prosthesis and the knee joint bone after implantation, the selection of bone growth factor 30 material requires confirmation of material stiffness based on the patient's knee CT values. When the patient's knee CT value is ≤110 HU, magnesium alloy is selected; when the patient's knee CT value is >110 HU, titanium alloy is selected. Therefore, different materials can be selected based on the patient's bone condition to achieve a mechanical match.

[0048] like Figures 3 to 8As shown, the pad structure 20 also includes an elastic element 23, which is disposed between the pad body 21 and the bottom wall of the main groove 111 and / or between the wing plate 22 and the bottom wall of the limiting groove 112, and applies an upward force to the pad body 21 and / or the wing plate 22. Under the combined action of the force on the patient's femoral side and the force of the elastic element 23, the pad structure 20 can float in the vertical direction a, thereby causing the bone growth body 30 to float in the vertical direction a, applying appropriate mechanical stimulation to the patient's bone. In addition, the elastic element 23 can also simulate a cushioning and shock absorption function to reduce the peak stress transmitted to the connection surface between the tibial prosthesis and the bone.

[0049] like Figure 7 and Figure 8 As shown, in this embodiment, elastic elements 23 are provided below both the pad body 21 and the wing plate 22, and multiple elastic elements 23 are arranged around the bone growth body 30; in an embodiment not shown in the figure, the elastic elements may be provided only below the pad body or only below the wing plate.

[0050] Specifically, in this embodiment, the elastic element 23 is a compression spring.

[0051] Specifically, such as Figure 5 and Figure 6 As shown, the limiting groove 112 is only connected to the main body groove 111 on its side. The limiting groove 112 has an upper groove wall and a lower groove wall. The upper groove wall of the limiting groove 112 is engaged with the upper surface of the wing plate 22 to prevent the pad body 21 from detaching upward from the tibial plateau 10 under the action of the elastic member 23. The tibial plateau 10 can be configured as a split structure so that the pad structure 20 can be installed inside the tibial plateau 10.

[0052] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 12As shown, the tibial prosthesis also includes a connecting post 40 and a micro-movement body 50. The connecting post 40 is located below the tibial plateau 10. The tibial plateau 10 has a first guide groove 13, and the connecting post 40 has a second guide groove 41. The first guide groove 13 is connected to the receiving groove 11 and the second guide groove 41. The micro-movement body 50 is located within the first guide groove 13 and the second guide groove 41 and is connected to the pad structure 20. The micro-movement body 50 extends downward from the tibial plateau 10 and outward from the connecting post 40. When the pad structure 20 floats in the vertical direction a, it can drive the micro-movement body 50 to float synchronously. The micro-movement body 50 is located within the first guide groove 13 and the second guide groove 41 and is connected to the pad structure 20, so that the pad structure 20 can drive the micro-movement body 50 to float synchronously. This allows the micro-movement body 50 to also apply a certain mechanical stimulation to the patient's bone, causing bone tissue differentiation within the medullary cavity and promoting the integration of the patient's bone with the bone growth plates 30, so as to achieve a stable connection between the tibial prosthesis and the patient's healthy bone as soon as possible.

[0053] Specifically, such as Figures 1 to 8 as well as Figure 12 As shown, the tibial platform 10 is provided with two pad structures 20. The wing plate 22 includes a first wing plate 221 and a second wing plate 222. The first wing plate 221 extends towards the side of the two pad structures 20 that are far apart from each other, and the second wing plate 222 extends towards the side of the two pad structures 20 that are close to each other. The lateral dimension of the second wing plate 222 is larger than the lateral dimension of the first wing plate 221. The micro-moving body 50 is connected to the second wing plate 222 to achieve synchronous floating with the pad structures 20. Correspondingly, the limiting groove 112 includes a first limiting groove 1121 and a second limiting groove 1122. The first wing plate 221 is disposed in the first limiting groove 1121, and the second wing plate 222 is disposed in the second limiting groove 1122. The two second limiting grooves 1122 on the tibial platform 10 are connected. The first guide groove 13 is connected to the second limiting groove 1122 to realize the connection between the micro-moving body 50 and the second wing plate 222.

[0054] like Figure 12 As shown, in this embodiment, the micro-movement body 50 has a plate-like structure, and the tibial prosthesis includes four micro-movement bodies 50. The sum of the dimensions of the first guide groove 13 and the second guide groove 41 in the vertical direction a is greater than the dimension of the micro-movement body 50 in the vertical direction a, thereby enabling the micro-movement body 50 to float within the first guide groove 13 and the second guide groove 41.

[0055] like Figure 1 and Figure 9As shown, the tibial prosthesis also includes a connecting sleeve 60, with a connecting post 40 inserted inside. The connecting sleeve 60 has a contracted state and an expanded state. When the connecting post 40 is inserted into the connecting sleeve 60, the connecting sleeve 60 remains in the expanded state. During the implantation of the tibial prosthesis, the connecting sleeve 60 can be initially controlled to be in the contracted state, making the radial dimension of the connecting sleeve 60 slightly smaller than the radial dimension of the medullary cavity, thereby reducing the difficulty of implanting the connecting sleeve 60. After the connecting sleeve 60 is implanted, the assembled prosthesis structure (specifically including the tibial plateau 10, the pad structure 20, the bone growth body 30, the connecting post 40, and the micro-movement body 50) is connected to the connecting sleeve 60. Specifically, the connecting post 40 is inserted into the connecting sleeve 60, and the connecting sleeve 60 remains in the expanded state under the action of the connecting post 40, allowing the connecting sleeve 60 to make close contact with the wall of the medullary cavity, thereby increasing the stability of the tibial prosthesis after implantation.

[0056] like Figure 1 , Figure 2 and Figure 9 As shown, the connecting cylinder 60 is provided with a relief groove 61, and the micro-moving body 50 extends outward from the connecting cylinder 60 through the relief groove 61. The micro-moving body 50 extends outward from the connecting cylinder 60 through the relief groove 61, so that the micro-moving body 50 can penetrate into the patient's bone. In this way, as the micro-moving body 50 floats up and down with the pad structure 20, it can apply mechanical stimulation to the patient's healthy bone to promote bone ingrowth.

[0057] like Figure 1 , Figure 2 and Figure 9 As shown, the connecting cylinder 60 includes an expanding outer cylinder 62, which includes multiple expanding plates 621 arranged along the circumferential direction of the connecting cylinder 60. When the connecting cylinder 60 is in a contracted state, adjacent expanding plates 621 are in contact. During the insertion of the connecting post 40 into the connecting cylinder 60, the connecting post 40 pushes the expanding plates 621 outward, thereby switching the connecting cylinder 60 from a contracted state to an expanded state. The expanding outer cylinder 62 is formed by the combination of multiple expanding plates 621, allowing the connecting cylinder 60 to switch between a contracted state and an expanded state, thus balancing convenience during tibial prosthesis implantation and stability after tibial prosthesis implantation.

[0058] like Figures 9 to 11 As shown, the connecting cylinder 60 also includes a fixed inner cylinder 63 and multiple connecting rods 64. The fixed inner cylinder 63 is disposed inside the expansion outer cylinder 62. Each expansion plate 621 is connected to the fixed inner cylinder 63 via a connecting rod 64. The two ends of the connecting rod 64 are hinged to the fixed inner cylinder 63 and the expansion plate 621, respectively. By connecting multiple expansion plates 621 to the fixed inner cylinder 63 via multiple connecting rods 64, the connecting cylinder 60 forms an integral structure, preventing the multiple expansion plates 621 from scattering and affecting the implantation efficiency.

[0059] like Figure 4 , Figure 5 , Figure 9 and Figure 11 As shown, the connecting post 40 includes a first column portion 42 and a second column portion 43. The first column portion 42 is located between the tibial plateau 10 and the second column portion 43. When the connecting post 40 is inserted into the connecting tube 60, the second column portion 43 is fixedly inserted into the fixed inner tube 63. The first column portion 42 is supported on the inner side of the expansion plate 621 so that the connecting tube 60 remains in an expanded state. The second column portion 43 is used to fix the connecting post 40 and the fixed inner tube 63 in place after the prosthesis is implanted, ensuring relative fixation. The first column portion 42 is supported on the inner side of the expansion plate 621, keeping the connecting tube 60 in an expanded state, allowing the expansion plate 621 to make close contact with the wall of the medullary cavity, thereby increasing the stability of the tibial prosthesis after implantation.

[0060] like Figure 4 , Figure 5 , Figure 9 and Figure 11 As shown, the first column portion 42 and / or the expansion plate 621 are provided with an expansion ramp 421, which is inclined outward in the direction from bottom to top. After the connecting tube 60 is inserted into the bone marrow cavity in a contracted state, the radial dimension of the inner hole of the expansion outer tube 62 is relatively small. The provision of the expansion ramp 421 facilitates the alignment of the inner holes of the first column portion 42 and the expansion outer tube 62. As the first column portion 42 is gradually inserted, the expansion outer tube 62 is pushed outward under the action of the expansion ramp 421, causing the connecting tube 60 to switch to the expansion state, thereby fixing the connecting tube 60 relative to the bone marrow cavity.

[0061] Specifically, in this embodiment, the expansion ramp 421 is disposed at the lower end of the first column portion 42; in an embodiment not shown in the figure, the expansion ramp can also be disposed on the expansion plate, or expansion ramps can be disposed on both the first column portion and the expansion plate.

[0062] like Figure 4 , Figure 5 and Figure 11 As shown, the second column portion 43 is provided with an anti-rotation wing 431, and the fixed inner cylinder 63 is provided with an anti-rotation groove 631. When the connecting column 40 is inserted into the connecting cylinder 60, the anti-rotation wing 431 is inserted into the anti-rotation groove 631. After the connecting column 40 is inserted into the connecting cylinder 60, the connecting cylinder 60 remains in an expanded state, so that the connecting cylinder 60 is fixed relative to the medullary cavity. The anti-rotation wing 431 is inserted into the anti-rotation groove 631, so that the connecting column 40 is fixed relative to the connecting cylinder 60 in the circumferential direction, thereby realizing the anti-rotation setting of the tibial plateau 10, the pad structure 20, the bone growth body 30, the connecting column 40, and the micro-movement body 50 relative to the medullary cavity.

[0063] like Figures 9 to 11 As shown, the expansion plate 621 is provided with a first hinge groove 6211. The outer end of the connecting rod 64 is hinged to the first hinge groove 6211. A fixing protrusion 641 is provided on the outer end face of the connecting rod 64. When the connecting tube 60 is in the contracted state, the fixing protrusion 641 is located in the first hinge groove 6211. When the connecting tube 60 is in the expanded state, the fixing protrusion 641 extends outward from the expansion plate 621. When the connecting tube 60 is placed into the medullary cavity, the connecting tube 60 is first controlled to be in the contracted state. At this time, the fixing protrusion 641 is located in the first hinge groove 6211, that is, the fixing protrusion 641 does not protrude outward from the expansion plate 621, so that the connecting tube 60 can be smoothly placed into the medullary cavity, allowing the doctor to easily implant the connecting tube 60 into the medullary cavity and avoid damage to the patient's bone during implantation of the prosthesis. After the implantation of the connecting tube 60 is completed, the assembled prosthesis structure (specifically including the tibial plateau 10 and the spacer) is then installed. Structure 20, bone growth body 30, connecting column 40 and micro-moving body 50) are connected to connecting tube 60. Specifically, the connecting column 40 is inserted into the connecting tube 60, and the first column part 42 of the connecting column 40 pushes the expansion plate 621 outward, so that the expansion plate 621 moves outward and the fixing protrusion 641 on the connecting rod 64 extends outward from the expansion plate 621. The fixing protrusion 641 abuts against the cavity wall of the medullary cavity, realizing the anti-rotation of the connecting tube 60 and the medullary cavity, and further increasing the connection stability of the connecting tube 60 and the medullary cavity.

[0064] Specifically, such as Figure 9 and Figure 10 As shown, the first hinge groove 6211 is provided through the expansion plate 621 along the radial direction of the connecting cylinder 60. The size of the first hinge groove 6211 in the vertical direction a is larger than the size of the connecting rod 64 in the vertical direction a, so as to avoid the upper and lower groove walls of the first hinge groove 6211 interfering with the swing of the connecting rod 64.

[0065] like Figures 9 to 11 As shown, a second hinge groove 632 is provided on the fixed inner cylinder 63, and the inner end of the connecting rod 64 is hinged to the second hinge groove 632. The second hinge groove 632 extends through the fixed inner cylinder 63 along the radial direction of the connecting cylinder 60. The dimension of the second hinge groove 632 in the vertical direction a is larger than the dimension of the connecting rod 64 in the vertical direction a, to avoid interference between the upper and lower groove walls of the second hinge groove 632 and the swing of the connecting rod 64.

[0066] like Figure 9 and Figure 10As shown, in this embodiment, the fixing protrusion 641 is provided on the lower side of the outer end face of the connecting rod 64, and a transition arc surface is provided on the upper side of the outer end face of the connecting rod 64. When the connecting tube 60 is in the retracted state, the outer end of the connecting rod 64 is lower than the inner end of the connecting rod 64, causing the multiple expansion plates 621 to approach each other and retract. At this time, the fixing protrusion 641 rotates to the inside of the first hinge groove 6211, and the transition arc surface on the connecting rod 64 rotates to the outside of the expansion plate 621 to avoid obstructing the operation of inserting the connecting tube 60 into the bone marrow cavity. When the connecting tube 60 is in the expanded state, the first column part 42 pushes the expansion plate 621 outward, causing the expansion plate 621 to move outward. At the same time, the second column part 43 pushes the fixing inner tube 63 downward, causing the fixing inner tube 63 to move downward. During the downward movement of the fixing inner tube 63, the inner end of the connecting rod 64 moves downward. At this time, after the connecting rod 64 rotates, it causes the fixing protrusion 641 to extend outward from the expansion plate 621. The fixing protrusion 641 contacts the bone marrow cavity to form a holding force, so as to achieve a stable connection between the connecting tube 60 and the patient's bone marrow cavity.

[0067] Specifically, in this embodiment, both ends of the connecting rod 64 are provided with pin holes. A first pin is provided in the first hinge groove 6211, and a second pin is provided in the second hinge groove 632. Both the first and second pins extend in the lateral direction and pass through the two pin holes of the connecting rod 64 respectively. The connecting cylinder 60 can be manufactured by 3D printing; alternatively, it can be formed by machining various components and assembling them together. In this case, some components need to be configured as a split structure to facilitate the assembly and connection of the various components.

[0068] Specifically, the connecting cylinder 60 can be formed from materials such as titanium alloy and tantalum metal and undergo anodizing treatment; the expansion outer cylinder 62 is a trabecular structure formed by 3D printing.

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

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

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

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

Claims

1. A tibial prosthesis, characterized in that, include: The tibial plateau (10) has a receiving groove (11) and a connecting groove (12), the receiving groove (11) is connected to the upper surface of the tibial plateau (10), and the connecting groove (12) connects the bottom wall of the receiving groove (11) and the lower surface of the tibial plateau (10); The gasket structure (20) is floatably disposed within the receiving groove (11) along the vertical direction (a); Bone growth body (30) is connected below the pad structure (20) and located in the connecting groove (12). When the pad structure (20) floats along the vertical direction (a), it can drive the bone growth body (30) downward through the tibial plateau (10). The tibial prosthesis also includes a connecting post (40) and a micro-movement body (50). The connecting post (40) is located below the tibial platform (10). The tibial platform (10) is provided with a first guide groove (13). The connecting post (40) is provided with a second guide groove (41). The first guide groove (13) is connected to the receiving groove (11) and the second guide groove (41). The micro-movement body (50) is located in the first guide groove (13) and the second guide groove (41) and is connected to the pad structure (20). The micro-movement body (50) extends downward from the tibial platform (10) and outward from the connecting post (40). When the pad structure (20) floats along the up-down direction (a), it can drive the micro-movement body (50) to float synchronously.

2. The tibial prosthesis according to claim 1, characterized in that, The pad structure (20) includes a pad body (21) and a wing plate (22) disposed on the side of the pad body (21). The receiving groove (11) includes a main groove (111) and a limiting groove (112) located on the side of the main groove (111). The pad body (21) is located in the main groove (111) and protrudes upward from the tibial plateau (10). The wing plate (22) is located in the limiting groove (112) and cooperates with the upper groove wall of the limiting groove (112).

3. The tibial prosthesis according to claim 2, characterized in that, The gasket structure (20) further includes an elastic element (23), which is disposed between the bottom wall of the gasket body (21) and the main body groove (111) and / or between the bottom wall of the wing plate (22) and the limiting groove (112), and applies an upward force to the gasket body (21) and / or the wing plate (22).

4. The tibial prosthesis according to claim 1, characterized in that, The tibial prosthesis also includes a connecting tube (60), and the connecting post (40) is inserted into the connecting tube (60). The connecting tube (60) has a contracted state and an expanded state. When the connecting post (40) is inserted into the connecting tube (60), the connecting tube (60) remains in the expanded state.

5. The tibial prosthesis according to claim 4, characterized in that, The connecting cylinder (60) is provided with a relief groove (61), and the micro-moving body (50) extends outward from the connecting cylinder (60) through the relief groove (61).

6. The tibial prosthesis according to claim 4, characterized in that, The connecting cylinder (60) includes an expanding outer cylinder (62), which includes a plurality of expanding plates (621) arranged along the circumferential direction of the connecting cylinder (60). When the connecting cylinder (60) is in the contracted state, the adjacent expanding plates (621) are in contact. During the process of inserting the connecting post (40) into the connecting cylinder (60), the connecting post (40) pushes the expanding plates (621) outward so that the connecting cylinder (60) switches from the contracted state to the expanded state.

7. The tibial prosthesis according to claim 6, characterized in that, The connecting cylinder (60) also includes a fixed inner cylinder (63) and a plurality of connecting rods (64). The fixed inner cylinder (63) is disposed inside the expanding outer cylinder (62). Each expanding plate (621) is connected to the fixed inner cylinder (63) through a connecting rod (64). The two ends of the connecting rod (64) are respectively hinged to the fixed inner cylinder (63) and the expanding plate (621).

8. The tibial prosthesis according to claim 7, characterized in that, The connecting column (40) includes a first column portion (42) and a second column portion (43). The first column portion (42) is located between the tibial plateau (10) and the second column portion (43). When the connecting column (40) is inserted into the connecting cylinder (60), the second column portion (43) is fixedly inserted into the fixed inner cylinder (63). The first column portion (42) is supported on the inner side of the expansion plate (621) so that the connecting cylinder (60) is kept in the expanded state.

9. The tibial prosthesis according to claim 8, characterized in that, An expansion ramp (421) is provided on the first columnar portion (42) and / or the expansion plate (621), and the expansion ramp (421) is inclined outward in the direction from bottom to top; and / or, The second column (43) is provided with an anti-spin side wing (431), and the fixed inner cylinder (63) is provided with an anti-spin groove (631). When the connecting column (40) is inserted into the connecting cylinder (60), the anti-spin side wing (431) is inserted into the anti-spin groove (631).

10. The tibial prosthesis according to claim 7, characterized in that, The expansion plate (621) is provided with a first hinge groove (6211), and the outer end of the connecting rod (64) is hinged to the first hinge groove (6211). A fixing protrusion (641) is provided on the outer end face of the connecting rod (64). When the connecting cylinder (60) is in the contracted state, the fixing protrusion (641) is located in the first hinge groove (6211). When the connecting cylinder (60) is in the expanded state, the fixing protrusion (641) extends outward from the expansion plate (621); and / or, The fixed inner cylinder (63) is provided with a second hinge groove (632), and the inner end of the connecting rod (64) is hinged to the second hinge groove (632).

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