Tibial prosthesis

Abstract

The invention provides a tibial prosthesis which comprises a tibial platform provided with a containing groove and a communicating groove, the containing groove is communicated with the upper surface of the tibial platform, and the communicating groove is communicated with the groove bottom wall of the containing groove and the lower surface of the tibial platform; the gasket structure is arranged in the containing groove in a floating mode in the vertical direction; the bone growth body is connected to the lower portion of the gasket structure and located in the communicating groove, and the gasket structure can drive the bone growth body to penetrate out of the tibial plateau downwards when floating in the vertical direction. According to the technical scheme, the problem that in the prior art, the time needed for combining the sclerotin and the prosthesis of a patient is long can be effectively solved.

Description

TECHNICAL FIELD

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

[0002] When the articular surface of the tibial plateau of a patient is irreversibly damaged due to osteoarthritis, rheumatoid arthritis, trauma, etc., it often leads to dysfunction of the knee joint. At this time, implanting a tibial joint prosthesis to replace the damaged articular surface is the most effective treatment to restore joint function, eliminate pain and improve quality of life.

[0003] In order to ensure the stability of the tibial prosthesis after implantation, a trabecular structure is generally provided on the tibial prosthesis to ensure the stability of the connection between the tibial prosthesis and the healthy bone of the patient. However, bone ingrowth requires a certain period of time, and the stability of the prosthesis in the period of time after implantation is difficult to guarantee. SUMMARY

[0004] The main purpose of the present application is to provide a tibial prosthesis to solve the problem of long time required for the combination of patient's bone and prosthesis in the related art.

[0005] In order to achieve the above-mentioned purpose, the present application provides a tibial prosthesis, comprising: a tibial plateau having a receiving groove and a communicating groove, the receiving groove being communicated with the upper surface of the tibial plateau, and the communicating groove being communicated with the groove bottom wall of the receiving groove and the lower surface of the tibial plateau; a gasket structure being floatably arranged in the receiving groove in the up-down direction; and a bone growth body being connected below the gasket structure and located in the communicating groove, the gasket structure being capable of driving the bone growth body to downwardly pass through the tibial plateau when the gasket structure floats in the up-down direction.

[0006] Further, the gasket structure comprises a gasket main body and a wing plate arranged at the side of the gasket main body, the receiving groove comprises a main groove and a limiting groove located at the side of the main groove, the gasket main body is located in the main groove and upwardly exposed to the tibial plateau, and the wing plate is located in the limiting groove and abutted with the upper groove wall of the limiting groove.

[0007] Further, the gasket structure further comprises an elastic member, the elastic member is arranged between the gasket main body and the groove bottom wall of the main groove and / or arranged between the wing plate and the groove bottom wall of the limiting groove, and applies an upward force to the gasket main body and / or the wing plate.

[0008] Further, the tibial prosthesis further comprises a connecting column and a micro-motion body, the connecting column is arranged below the tibial plateau, the tibial plateau is provided with a first guide groove, the connecting column is provided with a second guide groove, the first guide groove and the second guide groove are both communicated, the micro-motion body is arranged in the first guide groove and the second guide groove and connected with the gasket structure, the micro-motion body is downwardly exposed to the tibial plateau and outwardly exposed to the connecting column, and the gasket structure is capable of driving the micro-motion body to synchronously float when the gasket structure floats in the up-down direction.

[0009] Further, the tibial prosthesis further comprises a connecting cylinder, the connecting column is inserted into the connecting cylinder, the connecting cylinder has a contracted state and an expanded state, and the connecting cylinder remains in the expanded state when the connecting column is inserted into the connecting cylinder.

[0010] Further, the connecting cylinder is provided with a relief groove, and the micro-motion body extends outward from the connecting cylinder through the relief groove.

[0011] Further, the connecting cylinder comprises an expanded outer cylinder, the expanded outer cylinder comprises a plurality of expanded plate bodies arranged along the circumferential direction of the connecting cylinder, the adjacent expanded plate bodies are in contact when the connecting cylinder is in the contracted state, and the connecting column pushes the expanded plate bodies outward during the process of being inserted into the connecting cylinder, so that the connecting cylinder is switched from the contracted state to the expanded state.

[0012] Further, the connecting cylinder further comprises a fixed inner cylinder and a plurality of connecting rods, the fixed inner cylinder is arranged in the expanded outer cylinder, each expanded plate body is connected with the fixed inner cylinder through a connecting rod, and the two ends of the connecting rod are hingedly connected with the fixed inner cylinder and the expanded plate body, respectively.

[0013] Further, the connecting column comprises a first column body part and a second column body part, the first column body part is located between the tibial platform and the second column body part, the second column body part is fixedly inserted into the fixed inner cylinder when the connecting column is inserted into the connecting cylinder, and the first column body part is supported on the inner side of the expanded plate body so that the connecting cylinder remains in the expanded state.

[0014] Further, the first column body part and / or the expanded plate body is provided with an expansion inclined surface, which is inclined outward in the direction from bottom to top; and / or, the second column body part is provided with an anti-rotation side wing, and the fixed inner cylinder is provided with an anti-rotation groove, the anti-rotation side wing is inserted into the anti-rotation groove when the connecting column is inserted into the connecting cylinder.

[0015] Further, the expanded plate body is provided with a first hinged groove, the outer end of the connecting rod is hingedly connected in the first hinged groove, the outer end surface of the connecting rod is provided with a fixed protrusion, the fixed protrusion is located in the first hinged groove when the connecting cylinder is in the contracted state, and the fixed protrusion extends outward from the expanded plate body when the connecting cylinder is in the expanded state; and / or, the fixed inner cylinder is provided with a second hinged groove, and the inner end of the connecting rod is hingedly connected in the second hinged 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 An enlarged view of the connecting cylinder of the tibial prosthesis of Figure 9 ;

[0028] Figure 11 An enlarged view of the connecting cylinder of the tibial prosthesis of Figure 9 ;

[0029] Figure 12 An enlarged view of the connecting cylinder of the tibial prosthesis of Figure 1 .

[0030] Wherein, the above-mentioned drawings include the following reference signs:

[0031] 10, tibial plateau; 11, accommodating groove; 111, main body groove; 112, limiting groove; 1121, first limiting groove; 1122, second limiting groove; 12, communicating groove; 13, first guide groove;

[0032] 20, gasket structure; 21, gasket main body; 22, wing plate; 221, first wing plate; 222, second wing plate; 23, elastic member;

[0033] 30, bone growth body;

[0034] 40, connecting column; 41, second guide groove; 42, first columnar part; 421, expansion inclined surface; 43, second columnar part; 431, anti-rotation side wing;

[0035] 50, micro-motion body;

[0036] 60, connecting cylinder; 61, avoiding groove; 62, expansion outer cylinder; 621, expansion plate body; 6211, first hinged groove; 63, fixed inner cylinder; 631, anti-rotation groove; 632, second hinged groove; 64, connecting rod; 641, fixed protrusion;

[0037] a, up-down direction. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0039] It is to be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0040] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of illustration and description only. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description. In all examples shown and discussed herein, any specific value is to be interpreted as merely an example, and not as a limitation. Thus, other examples of example embodiments can have different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings, and thus, once an element is defined in one view, it should not require further discussion in subsequent views.

[0041] As shown in Figures 1 to 8 The present application provides a tibial prosthesis, embodiments of the tibial prosthesis of the present application include a tibial platform 10, a spacer structure 20 and a bone growth body 30, wherein the tibial platform 10 has a receiving groove 11 and a communication groove 12, the receiving groove 11 is communicated with the upper surface of the tibial platform 10, and the communication groove 12 is communicated with the groove bottom wall of the receiving groove 11 and the lower surface of the tibial platform 10; the spacer structure 20 is floatingly arranged in the receiving groove 11 along the up-down direction a; the bone growth body 30 is connected below the spacer structure 20 and located in the communication groove 12, and the spacer structure 20 can drive the bone growth body 30 to move downward out of the tibial platform 10 when the spacer structure 20 floats along the up-down direction a.

[0042] The technical scheme of the present application is applied, the spacer structure 20 is floatingly arranged on the tibial platform 10 along the up-down direction a, the bone growth body 30 is connected below the spacer structure 20, and the spacer structure 20 drives the bone growth body 30 to float synchronously when the spacer structure 20 floats, so that the bone growth body 30 can move downward out of the tibial platform 10, the bone growth body 30 applies mechanical stimulation to the healthy bone of the patient when moving downward, promotes bone growth, and enables the bone of the patient to be combined with the bone growth body 30 in a relatively short time, so as to realize stable connection of the tibial prosthesis and the healthy bone of the patient as soon as possible. Therefore, the technical scheme of the present application can effectively solve the problem of long time required for combination of the bone of the patient and the prosthesis in the related art.

[0043] The tibial platform 10 can be a porous structure made of titanium alloy, tantalum metal or the like material by 3D printing, and the tibial platform 10 can be subjected to an anodic oxidation treatment.

[0044] The bone contact surface of the tibial prosthesis provided by the embodiment forms an anatomical match with the knee joint of the patient, and can be designed according to the morphology of the knee joint of the human body.

[0045] As shown in Figures 3 to 8 The spacer structure 20 includes a spacer main body 21 and a wing plate 22 arranged at the side of the spacer main body 21, the receiving groove 11 includes a main body groove 111 and a limiting groove 112 located at the side of the main body groove 111, the spacer main body 21 is located in the main body groove 111 and exposed upward from the tibial platform 10, and the wing plate 22 is located in the limiting groove 112 and abuts against the upper groove wall of the limiting groove 112. The spacer main body 21 is located in the main body groove 111 and exposed upward from the tibial platform 10, and the patient can apply downward pressure to the spacer main body 21 during daily activities such as walking and knee bending, so that the spacer structure 20 drives the bone growth body 30 to move downward to apply mechanical stimulation to the patient's bone, thereby promoting the occurrence of bone growth; the wing plate 22 is located in the limiting groove 112 and abuts against the upper groove wall of the limiting groove 112, which can limit the spacer structure 20 from separating upward from the tibial platform 10, so as to ensure the structural stability of the tibial prosthesis as a whole.

[0046] The spacer main body 21 and the wing plate 22 are made of high molecular material such as ultra-high molecular weight polyethylene, and the bone growth body 30 is a porous structure made of titanium alloy or magnesium alloy by 3D printing.

[0047] In order to avoid stress shielding caused by the difference in stiffness between the prosthesis and the bone of the knee joint after the prosthesis is implanted, which leads to the occurrence of bone resorption, the selection of the material of the bone growth body 30 needs to confirm the material stiffness according to the CT value of the knee joint of the patient. When the CT value of the knee joint of the patient is ≤110HU, magnesium alloy material is selected; when the CT value of the knee joint of the patient is >110HU, titanium alloy material is selected. Therefore, different materials can be selected according to the bone condition of the patient, so as to realize mechanical matching.

[0048] As shown in Figures 3 to 8As shown, the spacer structure 20 further comprises elastic members 23, which are arranged between the spacer main body 21 and the bottom wall of the main body groove 111 and / or between the wing plate 22 and the bottom wall of the limiting groove 112, and apply an upward force to the spacer main body 21 and / or the wing plate 22. Under the combined action of the force on the patient's femur side and the force of the elastic members 23, the spacer structure 20 can float in the up-down direction a, thereby driving the bone growth body 30 to float in the up-down direction a, and applying appropriate mechanical stimulation to the patient's bone. In addition, the elastic members 23 can also simulate the buffering and shock absorption functions to reduce the peak stress transmitted to the tibial prosthesis and the connecting surface of the bone.

[0049] As shown in Figure 7 and Figure 8 In the present embodiment, the spacer main body 21 and the wing plate 22 are both provided with elastic members 23 below, and a plurality of elastic members 23 are arranged around the bone growth body 30; in the embodiments not shown in the figure, the elastic members can be arranged only below the spacer main body or only below the wing plate.

[0050] Specifically, in the present embodiment, the elastic members 23 are compression springs.

[0051] Specifically, as shown in Figure 5 and Figure 6 The limiting groove 112 is only communicated with the main body groove 111 on the side, and has an upper groove wall and a lower groove wall, and the upper groove wall of the limiting groove 112 is in abutting cooperation with the upper surface of the wing plate 22, so as to avoid the spacer main body 21 from being separated upward from the tibial platform 10 under the action of the elastic members 23. The tibial platform 10 can be arranged in a split structure from top to bottom, so that the spacer structure 20 can be installed inside the tibial platform 10.

[0052] As shown in Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 12As shown, the tibial prosthesis further comprises a connecting column 40 and a micro-motion body 50, the connecting column 40 is arranged below the tibial platform 10, the tibial platform 10 is provided with a first guide groove 13, the connecting column 40 is provided with a second guide groove 41, the first guide groove 13 and the second guide groove 41 are both arranged in communication, and the micro-motion body 50 is arranged in the first guide groove 13 and the second guide groove 41 and connected with the gasket structure 20, the micro-motion body 50 extends downwardly from the tibial platform 10 and outwardly from the connecting column 40, and the gasket structure 20 can drive the micro-motion body 50 to float synchronously when floating in the up-down direction a. The micro-motion body 50 is arranged in the first guide groove 13 and the second guide groove 41 and connected with the gasket structure 20, so that the gasket structure 20 can drive the micro-motion body 50 to float synchronously, so that the micro-motion body 50 can also apply a certain mechanical stimulation to the patient's bone, so that the bone tissue differentiation occurs inside the bone marrow cavity, and the combination of the patient's bone and the bone growth body 30 is promoted to realize the stable connection of the tibial prosthesis and the patient's healthy bone as soon as possible.

[0053] Specifically, as shown in Figures 1 to 8 and Figure 12 , the tibial platform 10 is provided with two gasket structures 20, the wing plate 22 comprises a first wing plate 221 and a second wing plate 222, the first wing plate 221 extends to the side where the two gasket structures 20 are away from each other, the second wing plate 222 extends to the side where the two gasket structures 20 are close to each other, the transverse dimension of the second wing plate 222 is greater than that of the first wing plate 221, and the micro-motion body 50 is connected with the second wing plate 222 to realize the synchronous floating with the gasket structure 20. Correspondingly, the limiting groove 112 comprises a first limiting groove 1121 and a second limiting groove 1122, the first wing plate 221 is arranged in the first limiting groove 1121, the second wing plate 222 is arranged in the second limiting groove 1122, and the two second limiting grooves 1122 on the tibial platform 10 are arranged in communication. The first guide groove 13 and the second limiting groove 1122 are arranged in communication to realize the connection of the micro-motion body 50 and the second wing plate 222.

[0054] As shown in Figure 12 , in this embodiment, the micro-motion body 50 is a plate structure, and the tibial prosthesis comprises four micro-motion bodies 50. The size of the first guide groove 13 and the second guide groove 41 in the up-down direction a is greater than the size of the micro-motion body 50 in the up-down direction a, so that the micro-motion body 50 can float in the first guide groove 13 and the second guide groove 41.

[0055] As shown in Figure 1 and Figure 9As shown, the tibial prosthesis further comprises a connecting cylinder 60, the connecting column 40 is inserted into the connecting cylinder 60, and the connecting cylinder 60 has a contracted state and an expanded state, and the connecting cylinder 60 remains in the expanded state when the connecting column 40 is inserted into the connecting cylinder 60. When implanting the tibial prosthesis, the connecting cylinder 60 can be controlled to be in the contracted state, so that the radial dimension of the connecting cylinder 60 is slightly smaller than the radial dimension of the medullary cavity, so as to reduce the difficulty of implanting the connecting cylinder 60; after the implantation of the connecting cylinder 60 is completed, the assembled prosthesis structure (specifically including the tibial platform 10, the gasket structure 20, the bone growth body 30, the connecting column 40 and the micro-motion body 50) is connected with the connecting cylinder 60. The specific operation is to insert the connecting column 40 into the connecting cylinder 60, and the connecting cylinder 60 remains in the expanded state under the action of the connecting column 40, so that the connecting cylinder 60 can be in close contact with the cavity wall of the medullary cavity, so as to increase the stability of the tibial prosthesis after implantation.

[0056] As shown in Figure 1 , Figure 2 and Figure 9 , the connecting cylinder 60 is provided with a avoiding slot 61, and the micro-motion body 50 extends outward from the connecting cylinder 60 through the avoiding slot 61. The micro-motion body 50 extends outward from the connecting cylinder 60 through the avoiding slot 61, so that the micro-motion body 50 can extend into the bone of the patient, and then the micro-motion body 50 can apply mechanical stimulation to the healthy bone of the patient during the process of floating up and down on the gasket structure 20, so as to promote bone in-growth.

[0057] As shown in Figure 1 , Figure 2 and Figure 9 , the connecting cylinder 60 comprises an expanded outer cylinder 62, and the expanded outer cylinder 62 comprises a plurality of expanded plate bodies 621 arranged along the circumferential direction of the connecting cylinder 60. When the connecting cylinder 60 is in the contracted state, the adjacent expanded plate bodies 621 are in contact, and during the process that the connecting column 40 is inserted into the connecting cylinder 60, the connecting column 40 pushes the expanded plate bodies 621 outward to switch the connecting cylinder 60 from the contracted state to the expanded state. The expanded outer cylinder 62 is formed by combining a plurality of expanded plate bodies 621, so that the connecting cylinder 60 can be switched between the contracted state and the expanded state, so as to balance the convenience during the implantation of the tibial prosthesis and the stability after the implantation of the tibial prosthesis.

[0058] As shown in Figures 9 to 11 , the connecting cylinder 60 further comprises a fixed inner cylinder 63 and a plurality of connecting rods 64, the fixed inner cylinder 63 is arranged in the expanded outer cylinder 62, each expanded plate body 621 is connected with the fixed inner cylinder 63 through a connecting rod 64, and the two ends of the connecting rod 64 are hingedly connected with the fixed inner cylinder 63 and the expanded plate body 621 respectively. The plurality of expanded plate bodies 621 are connected on the fixed inner cylinder 63 through the plurality of connecting rods 64, so that the connecting cylinder 60 forms a whole structure, and the plurality of expanded plate bodies 621 are prevented from being scattered to affect the implantation efficiency.

[0059] As shown in Figure 4 , Figure 5 , Figure 9 and Figure 11 , the connecting column 40 comprises a first column body 42 and a second column body 43, the first column body 42 is located between the tibial plateau 10 and the second column body 43, when the connecting column 40 is inserted into the connecting cylinder 60, the second column body 43 is fixedly inserted into the fixed inner cylinder 63, and the first column body 42 is supported on the inner side of the expansion plate body 621 to make the connecting cylinder 60 maintain in the expanded state. Among them, the second column body 43 is used to be fixedly inserted into the fixed inner cylinder 63, so that the connecting column 40 and the fixed inner cylinder 63 are relatively fixed after the prosthesis is implanted; the first column body 42 is supported on the inner side of the expansion plate body 621 and makes the connecting cylinder 60 maintain in the expanded state, so that the expansion plate body 621 can be in close contact with the cavity wall of the bone marrow cavity, thereby increasing the stability of the tibial prosthesis after implantation.

[0060] As shown in Figure 4 , Figure 5 , Figure 9 and Figure 11 , the first column body 42 and / or the expansion plate body 621 is provided with an expansion inclined surface 421, which is inclined outward in the direction from bottom to top. After the connecting cylinder 60 is placed into the bone marrow cavity in the contracted state, the radial dimension of the inner hole of the expansion outer cylinder 62 is relatively small, and the arrangement of the expansion inclined surface 421 facilitates the alignment of the first column body 42 and the inner hole of the expansion outer cylinder 62. With the gradual insertion of the first column body 42, the expansion outer cylinder 62 is pushed outward under the action of the expansion inclined surface 421, so that the connecting cylinder 60 switches to the expanded state, and the connecting cylinder 60 is fixedly arranged relative to the bone marrow cavity.

[0061] Specifically, in the present embodiment, the expansion inclined surface 421 is arranged at the lower end of the first column body 42; in the embodiment not shown in the figure, the expansion inclined surface can also be arranged on the expansion plate body, or the expansion inclined surface can be arranged on both the first column body and the expansion plate body.

[0062] As shown in Figure 4 , Figure 5 and Figure 11 , the second column body 43 is provided with an anti-rotation side 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 side 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 maintains in the expanded state so that the connecting cylinder 60 is fixedly arranged relative to the bone marrow cavity, and the anti-rotation side wing 431 is inserted into the anti-rotation groove 631, so that the connecting column 40 is fixedly arranged in the circumferential direction relative to the connecting cylinder 60, thereby realizing the anti-rotation arrangement of the tibial plateau 10, the gasket structure 20, the bone growth body 30, the connecting column 40 and the micro-motion body 50 relative to the bone marrow cavity.

[0063] As shown in Figures 9 to 11 , the expansion plate body 621 is provided with a first hinged groove 6211, and the outer end of the connecting rod 64 is hingedly connected in the first hinged groove 6211. The outer end surface of the connecting rod 64 is provided with a fixing protrusion 641. When the connecting cylinder 60 is in the contracted state, the fixing protrusion 641 is located in the first hinged groove 6211. When the connecting cylinder 60 is in the expanded state, the fixing protrusion 641 protrudes outward from the expansion plate body 621. When placing the connecting cylinder 60 into the bone marrow cavity, the connecting cylinder 60 is first controlled to be in the contracted state. At this time, the fixing protrusion 641 is located in the first hinged groove 6211, that is, the fixing protrusion 641 does not protrude outward from the expansion plate body 621, so that the connecting cylinder 60 can be smoothly placed into the bone marrow cavity, and the doctor can easily implant the connecting cylinder 60 into the bone marrow cavity, avoiding damage to the patient's bone quality when the prosthesis is implanted. After the implantation of the connecting cylinder 60 is completed, the assembled prosthesis structure (specifically including the tibial platform 10, the gasket structure 20, the bone growth body 30, the connecting column 40 and the micro-motion body 50) is connected with the connecting cylinder 60. The specific operation is to insert the connecting column 40 into the connecting cylinder 60. The first column body 42 of the connecting column 40 pushes the expansion plate body 621 outward, so that the expansion plate body 621 moves outward and the fixing protrusion 641 on the connecting rod 64 protrudes outward from the expansion plate body 621. The fixing protrusion 641 abuts against the cavity wall of the bone marrow cavity, realizing the anti-rotation of the connecting cylinder 60 and the bone marrow cavity, and further increasing the connection stability of the connecting cylinder 60 and the bone marrow cavity.

[0064] Specifically, as shown in Figure 9 and Figure 10 , the first hinged groove 6211 is provided through the expansion plate body 621 along the radial direction of the connecting cylinder 60. The size of the first hinged groove 6211 in the upward and downward direction a is greater than the size of the connecting rod 64 in the upward and downward direction a, so as to avoid the interference of the upper and lower groove walls of the first hinged groove 6211 to the swing of the connecting rod 64.

[0065] As shown in Figures 9 to 11 , the fixed inner cylinder 63 is provided with a second hinged groove 632, and the inner end of the connecting rod 64 is hingedly connected in the second hinged groove 632. The second hinged groove 632 is provided through the fixed inner cylinder 63 along the radial direction of the connecting cylinder 60. The size of the second hinged groove 632 in the upward and downward direction a is greater than the size of the connecting rod 64 in the upward and downward direction a, so as to avoid the interference of the upper and lower groove walls of the second hinged groove 632 to the swing of the connecting rod 64.

[0066] As shown in Figure 9 and Figure 10As shown, in the embodiment, the fixing protrusion 641 is arranged at the lower side of the outer end surface of the connecting rod 64, and the upper side of the outer end surface of the connecting rod 64 is provided with a transition arc surface. When the connecting barrel 60 is in the contracted state, the outer end of the connecting rod 64 is lower than the inner end of the connecting rod 64, so that the plurality of expansion plate bodies 621 are arranged close to each other and are contracted, at this time, the fixing protrusion 641 rotates to the inside of the first hinged groove 6211, and the transition arc surface on the connecting rod 64 rotates to the outside of the expansion plate body 621, so as to avoid hindering the operation of placing the connecting barrel 60 into the bone marrow cavity; when the connecting barrel 60 is in the expanded state, the first columnar portion 42 outwardly abuts against the expansion plate body 621 to make the expansion plate body 621 move outward, and the second columnar portion 43 downwardly pushes against the fixed inner barrel 63 to make the fixed inner barrel 63 move downward, in the process of moving downward of the fixed inner barrel 63, the inner end of the connecting rod 64 moves downward, at this time, the connecting rod 64 rotates to make the fixing protrusion 641 outwardly extend from the expansion plate body 621, and the fixing protrusion 641 contacts the bone marrow cavity to form a holding force, so as to realize the stable connection of the connecting barrel 60 and the bone marrow cavity of the patient.

[0067] Specifically, in the embodiment, both ends of the connecting rod 64 are provided with pin shaft holes, the first hinged groove 6211 is provided with a first pin shaft, the second hinged groove 632 is provided with a second pin shaft, and the first pin shaft and the second pin shaft both extend in the transverse direction and are respectively arranged in the two pin shaft holes of the connecting rod 64. Wherein, the connecting barrel 60 can be processed by 3D printing; or can be formed by machining each component and assembling them together, at this time, part of the components need to be arranged in a split structure, so as to realize the assembly and connection of each component.

[0068] Specifically, the connecting barrel 60 can be processed and formed by titanium alloy, tantalum metal and the like, and is subjected to anodic oxidation treatment; the expansion outer barrel 62 is a 3D printed trabecular structure.

[0069] In the description of the present application, it should be understood that "a plurality of" means two or more than two. The orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0070] For purposes of the description hereinafter, spatial or directional terms, for example, "above", "below", "upper", "lower", and the like, can be used, and relate to the device as illustrated in the figures. However, it is to be understood that no absolute or relative orientation of the device is intended or implied, unless specifically described as such. Terms concerning attachments, coupling and the like, such as "connected" and "coupled" and the like, are to be construed in accordance with their normal meanings, that is, as referring to an indirect or direct connection or coupling. Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to". Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to".

[0071] In addition, it should be pointed out that the use of the terms "first", "second" and the like, to describe various elements, is merely intended to differentiate the elements from one another, and does not connote any special order or order of precedence, unless otherwise specifically indicated. Thus, the use of the terms "first", "second" and the like, is not intended to limit the scope of the present application, and is not intended to connote any special order or order of precedence.

[0072] The preferred embodiments herein disclosed are not to be construed as limiting, and the scope of the protection is defined by the appended claims.

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).

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 any one of claims 1 to 3, characterized in that, 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.

5. The tibial prosthesis according to claim 4, 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.

6. The tibial prosthesis according to claim 5, 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).

7. The tibial prosthesis according to claim 5, 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.

8. The tibial prosthesis according to claim 7, 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).

9. The tibial prosthesis according to claim 8, 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.

10. The tibial prosthesis according to claim 9, 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).

11. The tibial prosthesis according to claim 8, 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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