CN211131553U

CN211131553U - Knee joint prosthesis

Info

Publication number: CN211131553U
Application number: CN201921549731.6U
Authority: CN
Inventors: 王安虎
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-07-31
Anticipated expiration: 2029-09-17

Abstract

The utility model provides a knee joint prosthesis, wherein a femur component, a tibia gasket, a tibia platform and a fixed column are arranged in the knee joint prosthesis, and the femur component is provided with a plurality of mounting positions; the upper surface of the tibial gasket is matched with the first matching surface of the femoral component, and the femoral component is movably arranged relative to the tibial gasket; the tibia platform is used for being connected with a tibia, the tibia gasket is movably arranged on the tibia platform, the upper portion of the tibia platform is provided with a second matching surface, and the lower surface of the tibia gasket is matched with the second matching surface; the fixing post is used for being connected with the femur, the fixing post can be selectively connected with any one of a plurality of mounting positions, and the fixing post is positioned on the side, facing away from the tibial gasket, of the femur component. Through the technical scheme, the position of the fixing column on the femoral component can be adjusted according to the specific condition of the femoral condyle of a patient, so that the fixing column is effectively fixed at a good place of the femoral condyle bone, the prosthesis is ensured to be implanted reliably for a long time, and loosening and overhauling are avoided.

Description

Knee joint prosthesis

Technical Field

The utility model relates to the technical field of medical equipment, particularly, relate to a knee joint prosthesis.

Background

The existing bicompartmental knee joint prosthesis mainly has two types: movable type and fixed type. The femoral component of both knee joint prostheses is fixed by a fixing column (or an anti-rotation rib). The position of the fixing column is fixed at the beginning of manufacturing and can not be adjusted, and when the femoral condyle is defective, the existing fixing column can not be effectively fixed at a good position of the femoral condyle bone, so that postoperative loosening and prosthesis revision can be caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a knee joint prosthesis to solve the nonadjustable problem in the fixed column position among the knee joint prosthesis among the prior art.

In order to solve the above problem, the present invention provides a knee joint prosthesis, comprising: a femoral component having a first mating surface, the femoral component having a plurality of mounting locations thereon; a tibial insert having an upper surface and a lower surface, wherein the upper surface mates with the first mating surface and the femoral component is movably disposed relative to the tibial insert; the tibia platform is used for being connected with a tibia, the tibia gasket is movably arranged on the tibia platform, the upper part of the tibia platform is provided with a second matching surface, and the lower surface of the tibia gasket is matched with the second matching surface; a fixation post for coupling with the femur, the fixation post being selectively coupleable with any one of a plurality of mounting locations, and the fixation post being located on a side of the femoral component facing away from the tibial insert.

Further, the mounting position has a mounting hole, and one end of the fixing column is detachably arranged in the mounting hole.

Furthermore, the mounting hole is provided with an internal thread, one end of the fixing column is provided with an external thread, and the fixing column is in threaded connection with the mounting hole; or the mounting hole is a conical hole, one end of the fixing column is of a conical structure, and the fixing column is inserted into the mounting hole.

Further, the femoral component comprises a first main body and a plurality of bosses, the first main body is provided with a first matching surface, the bosses are arranged on one side of the first main body, which is far away from the tibial gasket, at intervals, and the mounting positions are correspondingly arranged on the bosses.

Further, the fixed column includes first cylinder, second cylinder and porous structure layer, and first cylinder setting is connected with the mounted position in the one end of second cylinder, and porous structure layer sets up the surface at the second cylinder, and porous structure layer is used for being connected with the thighbone.

Further, the lower surface is an arc-shaped surface protruding towards the outside of the tibial gasket, and the second matching surface is an arc-shaped surface recessed towards the inside of the tibial platform.

Further, the tibial plateau includes: the surface of the upper side of the second main body is a second matching surface; the anti-rotation rib is arranged at the lower part of the second main body and is used for penetrating into the tibia; the blocking ring is arranged on the periphery of the second main body in a surrounding mode, at least one part of the blocking ring protrudes out of the second matching surface, and the blocking ring is used for limiting the tibial gasket.

Further, the shin bone gasket includes the third main part and encircles the spacing ring that the third main part set up, and the surface of third main part upside forms the upper surface, and the surface of third main part downside and the surface constitution lower surface of the downside of spacing ring, spacing ring be used for with keep off the spacing cooperation of ring.

Furthermore, the inner side of the baffle ring is provided with an annular groove, and the limiting ring can be clamped into the annular groove to limit the tibial gasket.

Furthermore, the anti-rotation rib is of a plate-shaped structure and is provided with a groove or a limiting hole.

The technical scheme of the utility model is applied to provide a knee joint prosthesis, wherein a femur component, a tibia gasket, a tibia platform and a fixing column are arranged in the knee joint prosthesis, the femur component is provided with a first matching surface, and a plurality of mounting positions are arranged on the femur component; the tibia gasket is provided with an upper surface and a lower surface, the upper surface is matched with the first matching surface, and the femur component is movably arranged relative to the tibia gasket; the tibia platform is used for being connected with a tibia, the tibia gasket is movably arranged on the tibia platform, the upper portion of the tibia platform is provided with a second matching surface, and the lower surface of the tibia gasket is matched with the second matching surface; the fixing post is used for being connected with the femur, the fixing post can be selectively connected with any one of a plurality of mounting positions, and the fixing post is positioned on the side, facing away from the tibial gasket, of the femur component. Through the technical scheme, the position of the fixing column on the femoral component can be adjusted according to the specific condition of the femoral condyle of a patient, so that the fixing column is effectively fixed at a good place of the femoral condyle bone, the prosthesis is ensured to be implanted reliably for a long time, and loosening and overhauling are avoided.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of a knee joint prosthesis provided by an embodiment of the present invention;

FIG. 2 shows a schematic structural view of the femoral component of FIG. 1;

FIG. 3 is a schematic diagram of the fixing column of FIG. 1;

FIG. 4 illustrates an assembly view of the tibial insert and tibial plateau of FIG. 1;

FIG. 5 shows a cross-sectional view of FIG. 4;

fig. 6 shows a cross-sectional view of fig. 4 in another direction.

Wherein the figures include the following reference numerals:

10. a femoral component; 11. a first mating surface; 12. mounting holes; 13. a first body; 14. a boss; 20. a tibial insert; 21. an upper surface; 22. a lower surface; 23. a third body; 24. a limiting ring; 30. a tibial plateau; 31. a second mating surface; 32. a second body; 33. anti-rotation ribs; 34. a baffle ring; 35. an annular groove; 40. fixing a column; 41. a first column; 42. a second cylinder; 43. a porous structure layer.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in the drawings, embodiments of the present invention provide a knee joint prosthesis, including: a femoral component 10, the femoral component 10 having a first mating surface 11, the femoral component 10 having a plurality of mounting locations thereon; a tibial insert 20, the tibial insert 20 having an upper surface 21 and a lower surface 22, wherein the upper surface 21 cooperates with the first mating surface 11, the femoral component 10 being movably disposed relative to the tibial insert 20; the tibial platform 30 is used for being connected with a tibia, the tibial insert 20 is movably arranged on the tibial platform 30, the upper part of the tibial platform 30 is provided with a second matching surface 31, and the lower surface 22 of the tibial insert 20 is matched with the second matching surface 31; an attachment post 40 for attachment to the femur, the attachment post 40 being selectively attachable to any one of a plurality of mounting locations, and the attachment post 40 being located on a side of the femoral component 10 facing away from the tibial insert 20.

By applying the technical scheme of the embodiment, the knee joint prosthesis is provided, and the knee joint prosthesis is provided with a femoral component 10, a tibial gasket 20, a tibial platform 30 and a fixing column 40, wherein the femoral component 10 is provided with a first matching surface 11, and the femoral component 10 is provided with a plurality of mounting positions; the tibial insert 20 has an upper surface 21 and a lower surface 22, the upper surface 21 cooperating with the first mating surface 11, the femoral component 10 being movably disposed relative to the tibial insert 20; the tibial platform 30 is used for connecting with the tibia, the tibial insert 20 is movably arranged on the tibial platform 30, the upper part of the tibial platform 30 is provided with a second matching surface 31, and the lower surface 22 of the tibial insert 20 is matched with the second matching surface 31; the fixation post 40 is configured to couple to the femur, the fixation post 40 selectively coupled to any one of a plurality of mounting locations, and the fixation post 40 positioned on a side of the femoral component 10 facing away from the tibial insert 20. Through the technical scheme, the position of the fixing column 40 on the femoral component 10 can be adjusted according to the specific condition of the femoral condyle of a patient, so that the fixing column 40 is effectively fixed at a good position of the femoral condyle bone, the prosthesis is ensured to be implanted reliably for a long time, and loosening and revision are avoided.

Optionally, in the present embodiment, there are a plurality of fixing posts 40 to improve the fixing effect. The number of the fixing posts 40 is less than the number of the mounting positions, which facilitates the adjustment of the positions of the fixing posts 40.

In the present embodiment, each mounting position has a mounting hole 12, and one end of the fixing post 40 is detachably disposed in the mounting hole 12. This facilitates the installation of the fixing post 40. Optionally, the extending directions of any two adjacent mounting holes 12 are different, so that the extending directions of any two adjacent fixing columns 40 are different after mounting, thereby facilitating connection with different positions of the femur and realizing reliable fixing.

In the embodiment, the mounting hole 12 is provided with an internal thread, one end of the fixing column 40 is provided with an external thread, and the fixing column 40 is in threaded connection with the mounting hole 12; or, the mounting hole 12 is a tapered hole, one end of the fixing column 40 is a tapered structure, and the fixing column 40 is inserted into the mounting hole 12. The above arrangement facilitates reliable connection of the fixing post 40 to the mounting hole 12.

In this embodiment, the femoral component 10 includes a first body 13 and a plurality of bosses 14, the first body 13 has a first mating surface 11, the plurality of bosses 14 are spaced apart on a side of the first body 13 facing away from the tibial insert 20, and the plurality of mounting locations are located on the plurality of bosses 14 in a one-to-one correspondence. By providing a plurality of bosses 14, the strength of the femoral component 10 can be increased at the bosses 14, thereby increasing the reliability of the connection of the femoral component 10 to the fixation posts 40.

Alternatively, as shown in FIG. 2, the first body 13 of the femoral component 10 includes first and second interconnected portions having an included angle therebetween, and the first mating surface 11 is disposed on the first portion. Bosses 14 are provided on both the first and second portions to facilitate adjustment of the position of the fixing post 40 as required. In this embodiment, the knee prosthesis may be used as a bicompartmental knee prosthesis.

Specifically, the fixing column 40 includes a first cylinder 41, a second cylinder 42, and a porous structure layer 43, the first cylinder 41 is disposed at one end of the second cylinder 42, the first cylinder 41 is connected with the installation site, the porous structure layer 43 is disposed on the outer surface of the second cylinder 42, and the porous structure layer 43 is used for connecting with the femur. The second post 42 is used for penetrating into the femur, and since the porous structure layer 43 is arranged on the outer surface of the second post 42, bone tissues can grow into the porous structure layer 43, and reliable connection and biological fusion are realized.

In this embodiment, the lower surface 22 is an arcuate surface that is convex toward the exterior of the tibial insert 20 and the second mating surface 31 is an arcuate surface that is concave toward the interior of the tibial plateau 30. Through the arrangement, the tibial insert 20 is not easy to be separated from the tibial platform 30, and the reliability is improved.

Optionally, the first mating surface 11 is an arcuate surface that is convex toward the exterior of the femoral component 10 and the upper surface 21 is an arcuate surface that is concave toward the interior of the tibial insert 20. With the above arrangement, movement of the femoral component 10 relative to the tibial insert 20 is facilitated to achieve the function of the human knee joint.

As shown in fig. 4 to 6, the tibial platform 30 includes: a second main body 32, wherein the surface of the upper side of the second main body 32 is a second matching surface 31; the anti-rotation rib 33 is arranged at the lower part of the second main body 32, and the anti-rotation rib 33 is used for penetrating into the tibia; the stop ring 34 is circumferentially arranged on the periphery of the second body 32, at least a part of the stop ring 34 protrudes above the second mating surface 31, and the stop ring 34 is used for limiting the tibial insert 20. Threading the anti-rotation ribs 33 into the tibia may provide a secure connection of the tibial plateau 30 to the tibia and may prevent rotation of the tibial plateau 30 relative to the tibia. Moreover, by arranging the retaining ring 34, when the tibial insert 20 moves to the position contacting with the retaining ring 34, the tibial insert 20 can be limited, so that the tibial insert 20 is prevented from being separated from the tibial platform 30, and the reliability is improved.

Further, the tibial insert 20 includes a third body 23 and a stop collar 24 disposed around the third body 23, wherein a surface of an upper side of the third body 23 forms the upper surface 21, a surface of a lower side of the third body 23 and a surface of a lower side of the stop collar 24 form the lower surface 22, and the stop collar 24 is configured to be in stop fit with the stop collar 34. This allows the tibial insert 20 to be retained by the stop collar 24 engaging the stop collar 34.

In this embodiment, the stop ring 34 has an annular groove 35 on the inner side, and the stop ring 24 can be snapped into the annular groove 35 to stop the tibial insert 20. Like this when tibial insert 20 moves to the border of tibial plateau 30, spacing ring 24 card is gone into in the ring channel 35, and the roof of ring channel 35 can avoid spacing ring 24 perk like this, avoids tibial insert 20 and tibial plateau 30 to break away from, further improves the reliability.

Alternatively, the top wall of the annular groove 35 is inclined from top to bottom in a direction from the groove bottom of the annular groove 35 to the opening of the annular groove 35, so that a better limiting effect on the limiting ring 24 can be achieved.

In the embodiment, the anti-rotation rib 33 is a plate-shaped structure, and the anti-rotation rib 33 has a groove or a limiting hole. Will prevent rotating muscle 33 and set up to platelike structure, will prevent rotating muscle 33 and insert the back in the shin bone, can avoid preventing rotating muscle 33 relative shin bone rotation to avoid tibial plateau 30 relative shin bone rotation, improve the reliability.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A knee joint prosthesis, comprising:

a femoral component (10), said femoral component (10) having a first mating surface (11), said femoral component (10) having a plurality of mounting locations thereon;

a tibial insert (20), said tibial insert (20) having an upper surface (21) and a lower surface (22), wherein said upper surface (21) cooperates with said first mating surface (11), said femoral component (10) being movably disposed relative to said tibial insert (20);

the tibial platform (30) is used for being connected with a tibia, the tibial insert (20) is movably arranged on the tibial platform (30), the upper part of the tibial platform (30) is provided with a second matching surface (31), and the lower surface (22) of the tibial insert (20) is matched with the second matching surface (31);

a fixation post (40) for attachment to the femur, the fixation post (40) being selectively attachable to any one of a plurality of said mounting locations, and the fixation post (40) being located on a side of the femoral component (10) facing away from the tibial insert (20).

2. The knee joint prosthesis according to claim 1, wherein the mounting position has a mounting hole (12), and one end of the fixing post (40) is detachably disposed in the mounting hole (12).

3. The knee joint prosthesis of claim 2,

the mounting hole (12) is provided with internal threads, one end of the fixing column (40) is provided with external threads, and the fixing column (40) is in threaded connection with the mounting hole (12); or the like, or, alternatively,

the mounting hole (12) is a tapered hole, one end of the fixing column (40) is of a tapered structure, and the fixing column (40) is inserted into the mounting hole (12).

4. The knee joint prosthesis according to claim 1, wherein the femoral component (10) comprises a first body (13) and a plurality of bosses (14), the first body (13) having the first mating surface (11), the plurality of bosses (14) being spaced apart on a side of the first body (13) facing away from the tibial insert (20), the plurality of mounting locations being located on the plurality of bosses (14) in a one-to-one correspondence.

5. Knee joint prosthesis according to claim 1, characterized in that the fixation column (40) comprises a first cylinder (41), a second cylinder (42) and a porous structural layer (43), the first cylinder (41) being arranged at one end of the second cylinder (42), the first cylinder (41) being connected to the mounting location, the porous structural layer (43) being arranged on the outer surface of the second cylinder (42), the porous structural layer (43) being intended to be connected to the femur.

6. The knee joint prosthesis according to claim 1, characterized in that said lower surface (22) is an arc-shaped surface convex towards the outside of the tibial insert (20) and said second mating surface (31) is an arc-shaped surface concave towards the inside of the tibial plateau (30).

7. The knee joint prosthesis according to any one of claims 1 to 6, wherein the tibial plateau (30) comprises:

a second body (32), a surface of an upper side of the second body (32) being the second mating face (31);

a rotation prevention rib (33) provided at a lower portion of the second body (32), the rotation prevention rib (33) being for penetrating into the tibia;

the retaining ring (34) is arranged around the periphery of the second main body (32), at least one part of the retaining ring (34) protrudes above the second matching surface (31), and the retaining ring (34) is used for limiting the tibial gasket (20).

8. The knee joint prosthesis according to claim 7, characterized in that the tibial insert (20) comprises a third body (23) and a stop ring (24) arranged around the third body (23), the surface of the upper side of the third body (23) forming the upper surface (21), the surface of the lower side of the third body (23) and the surface of the lower side of the stop ring (24) constituting the lower surface (22), the stop ring (24) being intended for stop engagement with the stop ring (34).

9. The knee joint prosthesis according to claim 8, characterized in that the inner side of the retaining ring (34) has an annular groove (35), the stop ring (24) being snappable into the annular groove (35) for stopping the tibial insert (20).

10. Knee joint prosthesis according to claim 7, characterized in that the anti-rotation rib (33) is a plate-like structure, the anti-rotation rib (33) having a groove or a limiting hole.