Knee joint prosthesis

Abstract

The application provides a knee joint prosthesis, which comprises a tibial plateau part, an elongated handle and a filling assembly; the filling assembly is arranged between the tibial plateau part and the elongated handle to connect the tibial plateau part and the elongated handle; wherein the filling assembly comprises a first adjusting part and a filling piece, the first adjusting part and the filling piece are detachably connected, the first adjusting part is used for being connected with the elongated handle, and the filling piece is used for being connected with the tibial plateau part; the filling piece comprises a second adjusting part, the second adjusting part has an extension part, the extension part is movably arranged, the area of the outer circumferential surface of the second adjusting part is increased by pushing the extension part to move, the outer circumferential surface of the second adjusting part can be in contact with the bone defect of the corresponding knee joint, and the effect that the second adjusting part is well matched with the bone defect of the corresponding knee joint is achieved; it can be seen that the knee joint prosthesis can meet different knee joint bone defect situations and has good universality.

Description

TECHNICAL FIELD

[0001] The present application relates to the medical field, in particular to a knee joint prosthesis. BACKGROUND

[0002] Regarding total knee revision, the primary replacement prosthesis and the diseased bone are removed at the time of revision, which will cause a certain degree of bone defect, and the position and degree of bone defect are different for different people.

[0003] In dealing with the problem of bone defect of total knee, knee joint prosthesis is usually needed, and the filling part of the existing knee joint prosthesis has a fixed structure and poor flexibility, which cannot be properly adjusted according to different bone defect positions and degrees to make it better filling. Although the knee joint prosthesis can be customized for patients to make its filling part better match the bone defect of each patient to meet the needs of each patient, the customized knee joint prosthesis has a long customization period and is expensive, and the customized knee joint prosthesis also does not have universality. SUMMARY

[0004] The main purpose of the present application is to provide a knee joint prosthesis to solve the problem that the knee joint prosthesis in the prior art does not have universality.

[0005] In order to achieve the above purpose, the present application provides a knee joint prosthesis, which comprises a tibial platform part, an extension handle and a filling assembly; the filling assembly is arranged between the tibial platform part and the extension handle to connect the tibial platform part and the extension handle; wherein the filling assembly comprises a first adjusting part and a filling piece, the first adjusting part and the filling piece are detachably connected, the first adjusting part is used to connect with the extension handle, and the filling piece is used to connect with the tibial platform part; the filling piece comprises a second adjusting part, the second adjusting part has an extension part, and the extension part is movably arranged to increase the area of the outer circumferential surface of the second adjusting part by pushing the extension part to move.

[0006] Further, the second adjusting part has a positioning hole, the extension part is a plurality of, the plurality of extension parts are arranged around the positioning hole, the first adjusting part is inserted in the positioning hole, and the area of the outer circumferential surface of the second adjusting part is adjusted by the cooperation of the first adjusting part and the positioning hole to make the extension part maintain at the initial position or push the extension part to move outward.

[0007] Further, the first adjusting part has a plurality of specifications, the areas of the outer circumferential surfaces of the first adjusting parts of the plurality of specifications are different, and the extension part is selectively maintained at the initial position or moved outward by selecting the first adjusting part of the corresponding specification and inserting the first adjusting part into the positioning hole.

[0008] Further, the first adjusting part has a cross-sectional area gradually decreasing along the inserting direction of the first adjusting part, so as to adjust the area of the outer circumferential surface of the second adjusting part by controlling the inserting depth of the first adjusting part; wherein the cross-sectional area of the first adjusting part is the area of the section of the first adjusting part perpendicular to the extending direction of the first adjusting part.

[0009] Further, the outer circumferential wall of at least part of the first adjusting part is provided with external threads, the inner circumferential wall of the positioning hole is provided with internal threads matched with the external threads, and the first adjusting part and the second adjusting part are screwed by the cooperation of the external threads and the internal threads.

[0010] Further, the first adjusting part comprises an operating part provided with an assembling groove, and a connecting part, wherein the operating part is arranged on the connecting part, and the outer circumferential wall of at least part of the connecting part is provided with external threads.

[0011] Further, the second adjusting part comprises a plurality of adjusting gaps, wherein the plurality of adjusting gaps are arranged at intervals along the circumferential direction of the second adjusting part, each adjusting gap is communicated with the positioning hole, and the expansion part is formed between adjacent two adjusting gaps.

[0012] Further, the tibial platform part comprises a reinforcing wing group comprising a plurality of reinforcing wings, and the filler comprises a plurality of wing-shaped hole groups arranged at intervals along the circumferential direction of the filler, wherein each wing-shaped hole group comprises a plurality of wing-shaped holes, the plurality of wing-shaped holes of each wing-shaped hole group are arranged one-to-one with the plurality of reinforcing wings so that each reinforcing wing is inserted into the corresponding wing-shaped hole, and the reinforcing wing group is selectively matched with the corresponding wing-shaped hole group.

[0013] Further, the wing-shaped hole group is two; and / or the reinforcing wing is two, and the wing-shaped hole of each wing-shaped hole group is two.

[0014] Further, the tibial platform part further comprises a tibial plate and a tibial column, the tibial plate is arranged on the tibial column, each reinforcing wing is arranged between the tibial plate and the tibial column, each reinforcing wing has a first side wall and a second side wall, the first side wall is in contact with the bottom wall of the tibial plate, and the second side wall is in contact with the outer circumferential wall of the tibial column; wherein the filler further has a filler channel, and at least part of the tibial column is inserted into the filler channel.

[0015] Further, the filler further comprises a filler block, the plurality of wing-shaped holes of each wing-shaped hole group and the filler channel are arranged on the filler block, and the second adjusting part is arranged on the filler block; the filler block comprises a filling part and a cutting part arranged oppositely; wherein the filling part is used to fill the bone defect of the knee joint of the patient.

[0016] Further, the extension stem comprises an extension stem body and a plug-in part, the plug-in part is arranged on the extension stem; the first adjusting part has a plug-in hole matched with the plug-in part, so that the extension stem is detachably connected with the first adjusting part by inserting at least part of the plug-in part into the plug-in hole.

[0017] Further, the plug-in part is in a columnar structure, and the cross-sectional area of the plug-in part gradually decreases from the insertion direction of the plug-in part.

[0018] Further, the extension stem body is provided with an anti-rotation ridge structure, the anti-rotation ridge structure comprises a plurality of ridge-shaped protrusions, the plurality of ridge-shaped protrusions are arranged at intervals around the circumference of the extension stem body; each ridge-shaped protrusion is arranged along the extension direction of the extension stem body.

[0019] Further, the extension stem body is provided with a tuning fork structure, the tuning fork structure comprises a plurality of elastic openings, the plurality of elastic openings are arranged at intervals around the circumference of the extension stem body, and each elastic opening is arranged along the extension direction of the extension stem body.

[0020] The knee joint prosthesis comprises a tibial platform part, an extension stem and a filling assembly; the filling assembly is arranged between the tibial platform part and the extension stem to connect the tibial platform part and the extension stem; wherein the filling assembly comprises a first adjusting part and a filling piece, the first adjusting part and the filling piece are detachably connected, the first adjusting part is used to connect with the extension stem, and the filling piece is used to connect with the tibial platform part; the filling piece comprises a second adjusting part, the second adjusting part has an extension part, the extension part is movably arranged, so that the area of the outer circumferential surface of the second adjusting part is increased by pushing the extension part to move, so that the outer circumferential surface of the second adjusting part can be in contact with the bone defect of the corresponding knee joint, thereby achieving the effect that the second adjusting part is well matched with the bone defect of the corresponding knee joint, that is, the filling assembly of the knee joint prosthesis can well adapt to the bone defect situation of the corresponding knee joint; it can be seen that the knee joint prosthesis can meet different knee joint bone defect situations by adjusting the area of the outer circumferential surface of the second adjusting part, which makes the knee joint prosthesis have good universality, thereby solving the problem that the knee joint prosthesis in the prior art does not have universality. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, make an explanation of the application, and do not constitute an improper limitation of the application. In the drawings:

[0022] Figure 1 An exploded structural view of a knee joint prosthesis according to an embodiment of the knee joint prosthesis of the application is shown;

[0023] Figure 2a first assembly structure diagram of a knee prosthesis in Figure 1

[0024] Figure 3 a second assembly structure diagram of a knee prosthesis in Figure 1

[0025] Figure 4 an external structure diagram of a first adjustment part of a knee prosthesis in Figure 1

[0026] Figure 5 an internal sectional structure diagram of a first adjustment part of a knee prosthesis in Figure 4

[0027] Figure 6 a structure diagram of a tibial plateau part of a knee prosthesis in Figure 1

[0028] Figure 7 an external structure diagram of a filler of a knee prosthesis in Figure 1

[0029] Figure 8 an internal sectional structure diagram of a filler of a knee prosthesis in Figure 7

[0030] Figure 9 a structure diagram of an extension handle of a knee prosthesis in Figure 1

[0031] Figure 10 a bottom view of an extension handle of a knee prosthesis in Figure 9

[0032] wherein the above-mentioned drawings include the following reference signs:

[0033] 70, knee prosthesis; 10, tibial plateau part; 11, tibial plate; 12, reinforcing wing; 13, tibial column; 40, filler; 41, first wing-shaped hole; 42, second wing-shaped hole; 43, filler channel; 45, filler block; 451, filler part; 452, cutting part; 47, second adjustment part; 472, positioning hole; 473, adjustment gap; 474, telescopic part; 50, extension handle; 51, extension handle body; 511, ridge-shaped protrusion; 512, tuning fork structure; 513, elastic opening; 52, plug-in part; 60, first adjustment part; 61, operation part; 62, connecting part; 63, assembly groove; 64, plug-in hole. DETAILED DESCRIPTION

[0034] ​​​​​​​​​It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] The present application provides a knee joint prosthesis 70, please refer to Figures 1 to 10 , the knee joint prosthesis 70 comprises a tibial platform 10, an extension handle 50 and a filling assembly; the filling assembly is arranged between the tibial platform 10 and the extension handle 50 to connect the tibial platform 10 and the extension handle 50; wherein the filling assembly comprises a first adjusting part 60 and a filling piece 40, the first adjusting part 60 and the filling piece 40 are detachably connected, the first adjusting part 60 is used for connecting with the extension handle 50, and the filling piece 40 is used for connecting with the tibial platform 10; the filling piece 40 comprises a second adjusting part 47, the second adjusting part 47 has a telescopic part 474, the telescopic part 474 is movably arranged to increase the area of the outer circumferential surface of the second adjusting part 47 by pushing the telescopic part 474 to move.

[0036] In the knee joint prosthesis 70 of the present application, the filling assembly of the knee joint prosthesis 70 comprises a first adjusting part 60 and a filling piece 40, the filling piece 40 comprises a second adjusting part 47, the second adjusting part 47 has a telescopic part 474, the telescopic part 474 is movably arranged to increase the area of the outer circumferential surface of the second adjusting part 47 by pushing the telescopic part 474 to move, so that the outer circumferential surface of the second adjusting part 47 can be in contact with the bone defect of the corresponding knee joint, thereby achieving the effect that the second adjusting part 47 is better matched with the bone defect of the corresponding knee joint, that is, the filling assembly of the knee joint prosthesis 70 can better adapt to the bone defect situation of the corresponding knee joint; it can be seen that the knee joint prosthesis 70 can meet different knee joint bone defect situations by adjusting the area of the outer circumferential surface of the second adjusting part 47, which makes the knee joint prosthesis 70 have good versatility, thereby solving the problem that the knee joint prosthesis in the prior art does not have versatility.

[0037] Specifically, the second adjusting part 47 has a positioning hole 472, the telescopic part 474 is a plurality of, the plurality of telescopic parts 474 are arranged around the positioning hole 472, the first adjusting part 60 is inserted in the positioning hole 472, and the telescopic part 474 is maintained at the initial position or pushed out to adjust the area of the outer circumferential surface of the second adjusting part 47 by the cooperation of the first adjusting part 60 and the positioning hole 472. When the telescopic part 474 is maintained at the initial position, the area of the outer circumferential surface of the second adjusting part 47 is the initial area, and when the telescopic part 474 is pushed out, the area of the outer circumferential surface of the second adjusting part 47 can be increased, thereby making the outer circumferential surface of the second adjusting part 47 more closely contact with the bone defect of the corresponding knee joint.

[0038] It should be noted that the above-mentioned "pushing the telescopic part 474 outward" is to push the telescopic part 474 to move the telescopic part 474 away from the positioning hole 472.

[0039] Specifically, the first adjusting part 60 has multiple specifications, and the areas of the outer circumferential surfaces of the first adjusting part 60 with multiple specifications are different. By selecting the first adjusting part 60 with a corresponding specification and inserting the first adjusting part 60 into the positioning hole 472, the telescopic part 474 can be selectively maintained at the initial position or pushed outward. Alternatively, the first adjusting part 60 has a standard specification and a larger size specification, where the larger size specification refers to a size larger than the standard specification. When the first adjusting part 60 with the standard specification is selected, the telescopic part 474 is maintained at the initial position, and the area of the outer circumferential surface of the second adjusting part 47 is the initial area. When the first adjusting part 60 with the larger size specification is selected, after the first adjusting part 60 is inserted into the positioning hole 472, the first adjusting part 60 generates a pushing force on the telescopic part 474 and pushes the telescopic part 474 outward. It can be seen that by selecting the first adjusting part 60 with different specifications to cooperate with the second adjusting part 47, the area of the outer circumferential surface of the second adjusting part 47 can be adjusted to adapt to different knee joint bone defect situations, and thus the knee joint prosthesis 70 has better versatility.

[0040] Alternatively, the first adjusting part 60 is a columnar structure, and the positioning hole 472 is a columnar hole. Preferably, the first adjusting part 60 is a substantially cylindrical structure, and the cylindrical structure has a standard diameter specification and a larger diameter specification, where the larger diameter specification refers to a diameter larger than the standard diameter.

[0041] Alternatively, the first adjusting part 60 can also be designed as a variable size structure, specifically, the cross-sectional area of the first adjusting part 60 gradually decreases along the insertion direction of the first adjusting part 60, so as to adjust the outer peripheral area of the second adjusting part 47 by controlling the insertion depth of the first adjusting part 60; wherein the cross-sectional area of the first adjusting part 60 is the area of the section of the first adjusting part 60 perpendicular to the extension direction of the first adjusting part 60. In the specific implementation process, by continuously inserting the first adjusting part 60 into the positioning hole 472, the first adjusting part 60 can continuously generate a pushing force on the telescopic part 474 and push the telescopic part 474 to continuously move outward as the first adjusting part 60 continuously inserts into the positioning hole 472, and as the telescopic part 474 continuously moves outward, the area of the outer peripheral surface of the second adjusting part 47 gradually increases until the area of the outer peripheral surface of the second adjusting part 47 fits the corresponding knee joint bone defect, at which time the second adjusting part 47 and the corresponding knee joint bone defect form a good matching effect, and then the operation of the first adjusting part 60 is stopped. It can be seen that the first adjusting part 60 with a variable size structure can adjust the area of the outer peripheral surface of the second adjusting part 47 by controlling the depth of the first adjusting part 60 inserted into the positioning hole 472, so as to adapt to different knee joint bone defect situations, and thus the knee joint prosthesis 70 has better versatility.

[0042] Specifically, as shown in Figure 4 The inner peripheral wall of the positioning hole 472 is provided with an inner thread matched with the outer thread, and the first adjusting part 60 and the second adjusting part 47 are screwed by the cooperation of the outer thread and the inner thread. In the specific implementation process, the first adjusting part 60 can be inserted into the positioning hole 472 by screwing the first adjusting part 60, or the depth of the first adjusting part 60 inserted into the positioning hole 472 can be controlled by screwing the first adjusting part 60.

[0043] In the specific implementation process, the first adjusting part 60 includes an operating part 61 and a connecting part 62; the operating part 61 is arranged on the connecting part 62, and the outer peripheral wall of at least part of the connecting part 62 is provided with an outer thread; the operating part 61 is provided with an assembly groove 63, and the assembly tool can be used to act on the assembly groove 63 to realize the operation of the first adjusting part 60, and then the first adjusting part 60 is inserted into the positioning hole 472. Alternatively, the assembly groove 63 is a cross-shaped groove; the assembly groove 63 is arranged on the top wall of the operating part 61, and the connecting part 62 is arranged at the bottom of the operating part 61.

[0044] Specifically, the second adjusting part 47 comprises a plurality of adjusting gaps 473, the plurality of adjusting gaps 473 are arranged at intervals around the circumference of the second adjusting part 47, each adjusting gap 473 is communicated with the positioning hole 472, and the adjacent two adjusting gaps 473 form an elastic part 474, so that each elastic part 474 can be deformed under the thrust of the first adjusting part 60, and then the part of the second adjusting part 47 surrounded by the plurality of elastic parts 474 has an elastic effect. Optionally, the adjusting gap 473 is a strip-shaped gap.

[0045] In order to realize the assembly between the tibial plateau part 10 and the filler 40, the tibial plateau part 10 comprises a reinforcing wing group, and the reinforcing wing group comprises a plurality of reinforcing wings 12. Figures 6 to 8 The filler 40 comprises a plurality of wing-shaped hole groups, and the plurality of wing-shaped hole groups are arranged at intervals along the circumference of the filler 40; each wing-shaped hole group comprises a plurality of wing-shaped holes, and the plurality of wing-shaped holes of each wing-shaped hole group are arranged in one-to-one correspondence with the plurality of reinforcing wings 12, so that each reinforcing wing 12 is inserted into the corresponding wing-shaped hole; and the reinforcing wing group is selectively matched with the corresponding wing-shaped hole group.

[0046] Optionally, the wing-shaped hole group is two; and / or the reinforcing wing 12 is two, and the wing-shaped hole of each wing-shaped hole group is two. In the embodiment, the wing-shaped hole group is two, and the two wing-shaped hole groups are respectively a first wing-shaped hole group and a second wing-shaped hole group; the reinforcing wing 12 is two, the first wing-shaped hole group comprises two first wing-shaped holes 41, and the two first wing-shaped holes 41 are arranged in one-to-one correspondence with the two reinforcing wings 12 respectively, the second wing-shaped hole group comprises two second wing-shaped holes 42, and the two second wing-shaped holes 42 are arranged in one-to-one correspondence with the two reinforcing wings 12 respectively, so that each reinforcing wing 12 can be inserted into the corresponding first wing-shaped hole 41 or the corresponding second wing-shaped hole 42, that is, the two reinforcing wings 12 of the reinforcing wing group are selectively matched with the two first wing-shaped holes 41 of the first wing-shaped hole group or the two second wing-shaped holes 42 of the second wing-shaped hole group.

[0047] In the implementation process, the tibial plateau part 10 further comprises a tibial plate 11 and a tibial column 13, the tibial plate 11 is arranged on the tibial column 13, each reinforcing wing 12 is arranged between the tibial plate 11 and the tibial column 13, each reinforcing wing 12 has a first side wall and a second side wall, the first side wall is in contact with the bottom wall of the tibial plate 11, and the second side wall is in contact with the outer peripheral wall of the tibial column 13. Wherein, the filler 40 further has a filling channel 43, at least part of the tibial column 13 is inserted into the filling channel 43. By arranging the reinforcing wing 12, the support effect on the tibial plate 11 can be more stable, so that the overall structure of the tibial plateau part 10 is more stable. The cooperation between the tibial column 13 and the filler 40 helps to further strengthen the stability of the structure after the tibial plateau part 10 and the filler 40 are assembled. Optionally, the tibial column 13 is fixed to the bottom of the tibial plate 11, and the tibial column 13 is a cylindrical structure; each reinforcing wing 12 is a substantially triangular structure, and the adjacent two side walls of the triangular structure are the first side wall and the second side wall.

[0048] In the implementation process, the filler 40 further comprises a filling block 45, the plurality of airfoil holes of each airfoil hole group and the filling channel 43 are arranged on the filling block 45, and the filling block 45 is arranged on the second adjusting part 47; optionally, the plurality of airfoil holes of each airfoil hole group and the filling channel 43 all penetrate through the top wall of the filling block 45; the second adjusting part 47 is arranged at the bottom of the filling block 45, the second adjusting part 47 is a columnar structure, and the telescopic part 474 is arranged at the bottom end of the second adjusting part 47; the filling channel 43 is in communication with the positioning hole 472.

[0049] As shown in Figure 2 , Figure 3 and Figure 7 , the filling block 45 comprises a filling part 451 and a cutting part 452 arranged oppositely; wherein, the filling part 451 is used for filling the bone defect of the knee joint of the patient; when each reinforcing wing 12 of the reinforcing wing group is correspondingly arranged in each first airfoil hole 41 of the first airfoil hole group, the filling part 451 is used for filling the medial bone defect of the left knee joint or the lateral bone defect of the right knee joint of the patient; when each reinforcing wing 12 of the reinforcing wing group is correspondingly arranged in each second airfoil hole 42 of the second airfoil hole group, the filling part 451 is used for filling the lateral bone defect of the left knee joint or the medial bone defect of the right knee joint of the patient.

[0050] In order to ensure the overall structural strength of the filler 40, the filling block 45 and the second adjusting part 47 are integrally formed.

[0051] In order to realize the assembly between the extension handle 50 and the first adjusting part 60, so that the extension handle 50 is connected with the filler 40 through the first adjusting part 60, as shown in Figure 5 and Figure 9As shown, the extension stem 50 comprises an extension stem body 51 and a plug-in part 52 which is arranged on the extension stem 50; the first adjusting part 60 has a plug-in hole 64 which is adapted to the plug-in part 52, so that the extension stem 50 is detachably connected with the first adjusting part 60 by inserting at least part of the plug-in part 52 into the plug-in hole 64. Optionally, the plug-in part 52 is arranged on the top of the extension stem body 51.

[0052] Specifically, the plug-in part 52 is a columnar structure, and the plug-in hole 64 is a columnar hole; the cross-sectional area of the plug-in part 52 gradually decreases from the insertion direction of the plug-in part 52; wherein the cross-sectional area of the plug-in part 52 is the area of the section of the plug-in part 52 which is perpendicular to the extension direction of the plug-in part 52. This not only enables the plug-in part 52 to be more stably inserted into the plug-in hole 64, thereby making the structure of the assembly of the extension stem 50 and the first adjusting part 60 more stable, but also makes the operation of inserting the plug-in part 52 into the plug-in hole 64 more convenient. In this embodiment, the "insertion direction of the plug-in part 52" is the direction in which the plug-in part 52 faces the first adjusting part 60.

[0053] Specifically, the extension stem body 51 is provided with an anti-rotation ridge structure, which comprises a plurality of ridge-shaped protrusions 511 arranged at intervals around the circumference of the extension stem body 51; each ridge-shaped protrusion 511 is arranged along the extension direction of the extension stem body 51. By arranging the anti-rotation ridge structure on the extension stem body 51, the rotation of the extension stem 50 in the bone marrow cavity can be prevented, thereby ensuring the stability of the knee joint prosthesis 70 after being implanted into the human body.

[0054] Specifically, as shown in Figs. 1 and 2, the extension stem body 51 is provided with a tuning fork structure 512, which comprises a plurality of elastic openings 513 arranged at intervals around the circumference of the extension stem body 51, each of which is arranged along the extension direction of the extension stem body 51; optionally, the tuning fork structure 512 is arranged on the extension stem body 51 near the lower end thereof, which enables the lower end of the extension stem body 51 to slightly deform under external force, i.e., the lower end of the extension stem body 51 has a certain degree of elastic effect, which enables the extension stem body 51 to slightly deform according to the actual shape of the bone marrow cavity, so that the outer peripheral wall of the extension stem body 51 closely fits the cavity wall of the bone marrow cavity, and the extension stem body 51 is more stably accommodated in the bone marrow cavity; it can be seen that the arrangement of the tuning fork structure 512 on the extension stem body 51 enables the extension stem body 51 to better adapt to different bone marrow cavities, which helps to improve the versatility of the extension stem 50. In addition, the better adaptive fit between the extension stem body 51 and the bone marrow cavity can also reduce the pain of the patient's leg, thereby improving the comfort of the patient's leg after the knee joint prosthesis 70 is implanted into the human body. Optionally, the elastic openings 513 are four, so that the tuning fork structure 512 forms a cross-shaped tuning fork. Figure 9 and Figure 10 Specifically, the extension stem body 51 is provided with a tuning fork structure 512, which comprises a plurality of elastic openings 513 arranged at intervals around the circumference of the extension stem body 51, each of which is arranged along the extension direction of the extension stem body 51; optionally, the tuning fork structure 512 is arranged on the extension stem body 51 near the lower end thereof, which enables the lower end of the extension stem body 51 to slightly deform under external force, i.e., the lower end of the extension stem body 51 has a certain degree of elastic effect, which enables the extension stem body 51 to slightly deform according to the actual shape of the bone marrow cavity, so that the outer peripheral wall of the extension stem body 51 closely fits the cavity wall of the bone marrow cavity, and the extension stem body 51 is more stably accommodated in the bone marrow cavity; it can be seen that the arrangement of the tuning fork structure 512 on the extension stem body 51 enables the extension stem body 51 to better adapt to different bone marrow cavities, which helps to improve the versatility of the extension stem 50. In addition, the better adaptive fit between the extension stem body 51 and the bone marrow cavity can also reduce the pain of the patient's leg, thereby improving the comfort of the patient's leg after the knee joint prosthesis 70 is implanted into the human body. Optionally, the elastic openings 513 are four, so that the tuning fork structure 512 forms a cross-shaped tuning fork.

[0055] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0056] In the knee joint prosthesis 70 of the present application, the knee joint prosthesis 70 comprises a tibial plateau part 10, an extension stem 50, and a filling assembly; the filling assembly is arranged between the tibial plateau part 10 and the extension stem 50 to connect the tibial plateau part 10 and the extension stem 50; wherein the filling assembly comprises a first adjusting part 60 and a filling piece 40, the first adjusting part 60 and the filling piece 40 are detachably connected, the first adjusting part 60 is used to be connected with the extension stem 50, and the filling piece 40 is used to be connected with the tibial plateau part 10; the filling piece 40 comprises a second adjusting part 47, the second adjusting part 47 has an extension part 474, the extension part 474 is movably arranged, so as to increase the area of the outer circumferential surface of the second adjusting part 47 by pushing the extension part 474 to move, so that the outer circumferential surface of the second adjusting part 47 can be in contact with the bone defect of the corresponding knee joint, thereby achieving the effect that the second adjusting part 47 is well matched with the bone defect of the corresponding knee joint, that is, the filling assembly of the knee joint prosthesis 70 can well adapt to the bone defect situation of the corresponding knee joint; it can be seen that the knee joint prosthesis 70 can meet different knee joint bone defect situations by adjusting the size of the area of the outer circumferential surface of the second adjusting part 47, which makes the knee joint prosthesis 70 have good universality, thereby solving the problem that the knee joint prosthesis in the prior art does not have universality.

[0057] In addition, in the knee joint prosthesis 70, the tibial plateau part 10 and the filling piece 40, the first adjusting part 60 and the filling piece 40, and the extension stem 50 and the first adjusting part 60 are detachably connected, that is, the knee joint prosthesis 70 is assembled by the tibial plateau part 10, the filling piece 40, the first adjusting part 60 and the extension stem 50, and in the actual application process, the most suitable specifications of the above-mentioned components can be selected according to the actual situation of the bone defect to assemble the most adaptive knee joint prosthesis 70; and the detachable connection between the components also makes the assembly and disassembly of the knee joint prosthesis 70 more convenient, which is conducive to increasing the convenience of implanting the knee joint prosthesis 70.

[0058] In addition, the knee joint prosthesis 70 provided by the present application avoids opening a connecting hole on the tibial plateau part 10 to connect the tibial plateau part 10 and the extension stem 50 through the connecting hole, which helps to strengthen the overall structural strength of the tibial plateau part 10, and further ensures the overall structural strength of the knee joint prosthesis 70.

[0059] For purposes of the description hereinafter, the orientations in the figures will be described as shown. It is to be understood that the orientations depicted in the figures are exemplary and that the exemplary embodiments described herein can assume various alternative orientations, except where otherwise indicated. The spatially relative terms "front," "rear," "under," "below," "lower," "upper," "over," "top," "side" and derivative thereof (e.g., "vertical," "horizontal" and "transverse") can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0060] It is to be understood that the terms so used are merely for describing certain example embodiments and do not intend to limit the scope of the example embodiments according to 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, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0061] It is to be understood that the terms so used are merely for describing certain example embodiments and do not intend to limit the scope of the example embodiments according to 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, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0062] The specific embodiments described herein have many advantages resulting from the particular combination of structures and methods used in the implementations. Of course, various modifications and changes can be made to the implementations described and the elements thereof without departing from the true spirit and scope of the application. It should be apparent, however, to those skilled in the art that many more modifications can be made to the application described above and that many useful results can be attained by applying the novel teachings set forth herein, within the scope of the present application inventive concepts. For example, one skilled in the art will appreciate that the various example embodiments described herein can be implemented in combination with other examples described herein or with other products or methods not mentioned. Moreover, different product configurations can be implemented using the same or similar techniques as those described herein. Such modifications to the implementations herein described can be made only by those skilled in the art, with the benefit of the teachings presented herein. Accordingly, the particular embodiments disclosed using the product and method configurations described herein are illustrative only and should not be considered limiting in any regard.

Claims

1. A knee joint prosthesis, characterized in that: include: tibial plateau (10); Extension handle (50); A filling component, the filling component is arranged between the tibial plateau portion (10) and the extension handle (50) to connect the tibial plateau portion (10) and the extension handle (50); The filling assembly comprises a first adjusting portion (60) and a filling piece (40), wherein the first adjusting portion (60) and the filling piece (40) are detachably connected, the first adjusting portion (60) is used to be connected to the extension handle (50), and the filling piece (40) is used to be connected to the tibial plateau portion (10); The filling member (40) includes a second adjusting portion (47), wherein the second adjusting portion (47) has a telescopic portion (474), and the telescopic portion (474) is movably arranged to increase the area of ​​the outer peripheral surface of the second adjusting portion (47) by pushing the telescopic portion (474) to move; The second adjusting portion (47) has a positioning hole (472), and there are multiple telescopic portions (474). The multiple telescopic portions (474) are arranged around the positioning hole (472). The first adjusting portion (60) is inserted into the positioning hole (472). The first adjusting portion (60) cooperates with the positioning hole (472) to maintain the telescopic portion (474) in an initial position or push the telescopic portion (474) outward to adjust the area of ​​the outer peripheral surface of the second adjusting portion (47).

2. The knee joint prosthesis according to claim 1, characterized in that The first adjusting portion (60) has various specifications, and the areas of the outer peripheral surfaces of the first adjusting portions (60) of various specifications are different. By selecting the first adjusting portion (60) of the corresponding specifications and inserting the first adjusting portion (60) into the positioning hole (472), the telescopic portion (474) can be selectively maintained at the initial position or moved outward.

3. The knee joint prosthesis according to claim 1, characterized in that Along the insertion direction of the first adjusting portion (60), the cross-sectional area of ​​the first adjusting portion (60) gradually decreases, so as to adjust the area of ​​the outer peripheral surface of the second adjusting portion (47) by controlling the insertion depth of the first adjusting portion (60); wherein the cross-sectional area of ​​the first adjusting portion (60) is the area of ​​the cross section of the first adjusting portion (60) perpendicular to the extension direction of the first adjusting portion (60).

4. The knee joint prosthesis according to claim 2 or 3, characterized in that: At least part of the outer peripheral wall of the first adjusting portion (60) is provided with an external thread, and the inner peripheral wall of the positioning hole (472) is provided with an internal thread adapted to the external thread, and the first adjusting portion (60) and the second adjusting portion (47) are screwed together by the mutual cooperation of the external thread and the internal thread.

5. The knee joint prosthesis according to claim 4, characterized in that The first adjusting portion (60) includes: An operating portion (61), wherein the operating portion (61) is provided with a mounting groove (63); A connecting portion (62), the operating portion (61) is arranged on the connecting portion (62), and at least a portion of the outer peripheral wall of the connecting portion (62) is provided with the external thread.

6. The knee joint prosthesis according to claim 1, characterized in that The second adjustment portion (47) includes a plurality of adjustment notches (473), which are arranged at intervals around the circumference of the second adjustment portion (47), each of the adjustment notches (473) is connected to the positioning hole (472), and the telescopic portion (474) is formed between two adjacent adjustment notches (473).

7. The knee joint prosthesis according to claim 1, characterized in that The tibial plateau portion (10) includes a reinforcement wing group, and the reinforcement wing group includes a plurality of reinforcement wings (12); the filling piece (40) includes a plurality of wing-shaped hole groups, and the plurality of wing-shaped hole groups are arranged at intervals along the circumference of the filling piece (40); each of the wing-shaped hole groups includes a plurality of wing-shaped holes, and the plurality of wing-shaped holes of each wing-shaped hole group are arranged in a one-to-one correspondence with the plurality of reinforcement wings (12), so that each reinforcement wing (12) is inserted into the corresponding wing-shaped hole; the reinforcement wing group can selectively cooperate with a corresponding one of the wing-shaped hole groups.

8. The knee joint prosthesis according to claim 7, characterized in that There are two wing-shaped hole groups; and / or there are two reinforcing wings (12), and each of the wing-shaped hole groups has two wing-shaped holes.

9. The knee joint prosthesis according to claim 7, characterized in that The tibial plateau portion (10) further comprises: Tibial plate (11); A tibial column (13), wherein the tibial plate (11) is arranged on the tibial column (13), and each of the reinforcing wings (12) is arranged between the tibial plate (11) and the tibial column (13), and each of the reinforcing wings (12) has a first side wall and a second side wall, wherein the first side wall is in contact with the bottom wall of the tibial plate (11), and the second side wall is in contact with the outer peripheral wall of the tibial column (13); The filling piece (40) further comprises a filling channel (43), and at least a portion of the tibial column (13) is inserted into the filling channel (43).

10. The knee joint prosthesis according to claim 9, characterized in that The filler (40) further comprises: A filling block (45), the plurality of wing-shaped holes of each wing-shaped hole group and the filling channel (43) are all arranged on the filling block (45), and the second adjusting portion (47) is arranged on the filling block (45); the filling block (45) includes a filling portion (451) and a cutting portion (452) arranged opposite to each other; wherein the filling portion (451) is used to fill a patient's knee joint bone defect.

11. The knee joint prosthesis according to claim 1, characterized in that The extension handle (50) comprises an extension handle body (51) and an inserting portion (52), wherein the inserting portion (52) is arranged on the extension handle (50); the first adjusting portion (60) has an inserting hole (64) adapted to the inserting portion (52), so that the extension handle (50) and the first adjusting portion (60) are detachably connected by inserting at least a portion of the inserting portion (52) into the inserting hole (64).

12. The knee joint prosthesis according to claim 11, characterized in that The plug-in portion (52) is a columnar structure, and the cross-sectional area of ​​the plug-in portion (52) gradually decreases from the insertion direction of the plug-in portion (52); wherein the cross-sectional area of ​​the plug-in portion (52) is the area of ​​the cross section of the plug-in portion (52) perpendicular to the extension direction of the plug-in portion (52).

13. The knee joint prosthesis according to claim 11, characterized in that The extension handle body (51) is provided with an anti-rotation ridge structure, and the anti-rotation ridge structure includes a plurality of ridge-like protrusions (511), and the plurality of ridge-like protrusions (511) are arranged at intervals around the circumference of the extension handle body (51); each of the ridge-like protrusions (511) is arranged along the extension direction of the extension handle body (51).

14. The knee joint prosthesis according to claim 11, characterized in that The extension handle body (51) is provided with a tuning fork structure (512), and the tuning fork structure (512) includes a plurality of elastic openings (513). The plurality of elastic openings (513) are arranged at intervals around the circumference of the extension handle body (51), and each of the elastic openings (513) is arranged along the extension direction of the extension handle body (51).

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