Single-condylar knee joint tibial plateau prosthesis

Abstract

The tibial plateau prosthesis comprises a tibial plateau surface and reinforcing ribs connected to a non-articular surface of the tibial plateau, the reinforcing ribs comprise a first reinforcing rib and a second reinforcing rib, the first reinforcing rib is arranged in the length direction of the tibial plateau prosthesis, the second reinforcing rib is arranged in the length direction of the tibial plateau prosthesis, and the third reinforcing rib is arranged in the length direction of the tibial plateau prosthesis. The second reinforcing ribs are perpendicular to the first reinforcing ribs, and a plurality of second reinforcing ribs can be arranged according to needs. The reinforcing rib is provided with a wire groove or a through hole structure, and the non-articular surface of the tibial plateau is provided with a pit structure with an unlimited shape. The strength of the tibial plateau of the unicompartmental knee joint can be enhanced, the probability that the tibial plateau is subjected to fatigue fracture under the action of cyclic load of flexion and extension movement of a human body is reduced, and the service life of the product is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a unicompartmental knee tibial plateau prosthesis. Background Art

[0002] Unicompartmental knee arthroplasty is an effective method for treating unicompartmental arthritis, which can significantly relieve knee pain and improve function. In recent years, with the progress of prosthesis design, the improvement of surgical techniques and the expansion of indications, the proportion of unicompartmental knee arthroplasty has gradually increased globally. At present, the situation of tibial tray fracture in unicompartmental knee arthroplasty has been clinically observed. Its failure mode occurs when the front and rear edges of the implant are located on the cortical bone and the middle part has no support, and fracture occurs under the cyclic load of flexion and extension movement. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the above technical problems in the prior art to a certain extent.

[0004] To this end, an object of the utility model is to provide a unicompartmental knee tibial plateau prosthesis.

[0005] A unicompartmental knee tibial plateau prosthesis, the tibial plateau prosthesis includes a tibial plateau surface and a reinforcing rib connected to the non-articular surface of the tibial plateau.

[0006] Preferably, the reinforcing rib is of a T-shaped structure.

[0007] Preferably, the reinforcing rib includes: a first reinforcing rib and a second reinforcing rib;

[0008] The first reinforcing rib is arranged along the length direction of the tibial plateau prosthesis, and the second reinforcing rib is perpendicular to the first reinforcing rib to form a T-shaped structure.

[0009] Preferably, the reinforcing rib includes a plurality of first reinforcing ribs arranged in parallel; the first reinforcing ribs are arranged along the length direction of the tibial plateau prosthesis, and the length of the first reinforcing rib is shorter than the distance in the length direction of the tibial plateau.

[0010] Preferably, the reinforcing rib is of a π-shaped structure.

[0011] Preferably, the reinforcing rib includes: a first reinforcing rib, a second reinforcing rib;

[0012] There are two second reinforcing ribs;

[0013] The first reinforcing rib is parallel to the length direction of the tibial plateau, and both of the two second reinforcing ribs are perpendicular to the first reinforcing rib, and the two second reinforcing ribs are spaced apart by a certain distance.

[0014] Preferably, the reinforcing rib includes: a first reinforcing rib and a plurality of second reinforcing ribs;

[0015] The first reinforcing rib is parallel to the length direction of the tibial plateau, and the plurality of second reinforcing ribs are all perpendicular to the first reinforcing rib.

[0016] Preferably, the first reinforcing rib and the non-articular surface of the tibial plateau are integrally designed, and the plurality of second reinforcing ribs are slidably connected to the non-articular surface of the tibial plateau and the first reinforcing rib.

[0017] Preferably, a dovetail structure is provided on the non-articular surface of the tibial plateau, a dovetail groove structure is provided on the first reinforcing rib, and the plurality of second reinforcing ribs are provided with dovetail / dovetail groove structures matching the dovetail groove / dovetail structure.

[0018] Preferably, the reinforcing rib is provided with a wire groove or a through-hole structure, and the non-articular surface of the tibial plateau is provided with a pit structure with an unlimited shape.

[0019] It can be seen from the above technical solutions that, compared with the prior art, the present invention has the following effects:

[0020] When the tibial plateau bears the fatigue load from top to bottom, the specially designed reinforcing rib structure can reduce the stress concentration on the tibial plateau surface, reduce the risk of fatigue fracture of the tibial plateau, and increase the service life of the unicompartment tibial plateau prosthesis.

[0021] The present invention can strengthen the strength of the unicompartment knee joint tibial plateau, reduce the probability of fatigue fracture of the tibial plateau under the action of the cyclic load during the flexion and extension movement of the human body, and thus increase the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0023] Figure 1 It is a schematic structural diagram of a unicompartment knee joint tibial plateau;

[0024] Figure 2 It is a schematic structural diagram of the non-articular surface of the tibial plateau in an embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the non-articular surface of the tibial plateau in another embodiment of the present invention;

[0026] Figure 4This is a schematic structural diagram of the non-articular surface of the tibial plateau in another embodiment of the present invention;

[0027] Figure 5 It is a schematic structural diagram of the non-articular surface of the tibial plateau in another embodiment of the present invention.

[0028] Among them, in the figure:

[0029] 10-unicompartmental knee joint tibial plateau structure; 11-tibial plateau non-articular surface; 111-pit; 12-tibial plateau side; 20-reinforcement rib; 21-first reinforcement rib; 22-second reinforcement rib; 30-wire groove; through hole 40; 41-dovetail groove structure; 42-dovetail structure. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0035] In one embodiment of the unicondylar knee tibial plateau prosthesis of the present utility model, the tibial plateau prosthesis is a cemented type. The non-articular surface 11 of the tibial plateau prosthesis is compatible with the human body through bone cement to reduce the corresponding rejection reaction.

[0036] The unicondylar knee tibial plateau prosthesis of the present utility model can be a mobile platform or a fixed platform, as long as it can achieve the bearing of the unicondylar prosthesis.

[0037] Embodiment 1

[0038] This embodiment provides a unicondylar knee tibial plateau prosthesis, including a tibial plateau surface and a reinforcing rib 20 connected to the non-articular surface 11 of the tibial plateau.

[0039] As Figure 1 shown, the unicondylar knee tibial plateau prosthesis is generally designed in an "L" shape. The tibial plateau surface is the articular surface in contact with the tibial pad and has a highly polished surface feature.

[0040] As Figure 2 shown, the lower surface of the tibial plateau is the non-articular surface 11 of the tibial plateau. The surface is sandblasted and has a relatively high surface roughness to improve the bonding strength with the bone cement.

[0041] In this embodiment, a reinforcing rib 20 is provided on the non-articular surface 11 of the tibial plateau. The reinforcing rib 20 is composed of a first reinforcing rib 21 distributed along the length direction of the tibial plateau ( Figure 2 the direction indicated by the arrow X in

[0042] the figure) and a second reinforcing rib 22 perpendicular to the first reinforcing rib 21. The reinforcing rib 20 and the tibial plateau are integrally designed.

[0043] Embodiment 2

[0044] As Figure 3As shown in the figure, this embodiment is another implementation mode of the present utility model:

[0045] Reinforcing ribs 20 are provided on the non-articular surface 11 of the tibial plateau. The reinforcing ribs 20 are composed of a first reinforcing rib 21 distributed along the X direction and a second reinforcing rib 22 perpendicular to the first reinforcing rib 21. There are two second reinforcing ribs 22, and the reinforcing ribs 20 and the tibial plateau are integrally designed.

[0046] In this embodiment, the first reinforcing rib 21 can be set at a position flush with the side surface 12 of the tibial plateau or at a certain distance from the side surface 12 of the tibial plateau; the second reinforcing rib 22 is arranged at approximately the middle 1 / 3 part of the tibial plateau in the X direction. This part is the range of flexion and extension movement of the unicompartmental prosthesis physiologically. The second reinforcing rib 22 strengthens the main stress area and reduces the risk of tibial plateau fracture.

[0047] Embodiment 3

[0048] As Figure 4 shown in the figure, this embodiment is another implementation mode of the present utility model:

[0049] Reinforcing ribs 20 are provided on the non-articular surface 11 of the tibial plateau. The reinforcing ribs 20 are composed of a first reinforcing rib 21 distributed along the X direction and a second reinforcing rib 22 perpendicular to the first reinforcing rib 21. There are two second reinforcing ribs, and the reinforcing ribs 20 and the tibial plateau are of split design.

[0050] A dovetail groove 41 is formed on the first reinforcing rib 21, a dovetail structure 42 is provided on the non-articular surface 11 of the tibial plateau, and the second reinforcing rib 22 is provided with a dovetail / dovetail groove structure matching 41 and 42 to support the second reinforcing rib 22 to slide along the X direction.

[0051] In the normal physiological flexion movement of the human knee joint, the movement ranges of the femoral condyles on the medial and lateral sides of the knee joint are different (that is, the travel distances of the medial unicompartmental and lateral unicompartmental along the X direction on the tibial plateau are inconsistent), and the movement ranges of different individuals on the tibial plateau also vary. It can be understood that the freely slidable second reinforcing rib 22 can determine the coordinate position in the X direction according to actual needs to strengthen the main stress area of the tibial plateau.

[0052] Furthermore, when there are dimensional errors in the groove for the second reinforcing rib 22 on the tibia during the operation, the error can be eliminated by adjusting the position of the second reinforcing rib 22.

[0053] Embodiment 4

[0054] As Figure 5 shown in the figure, this embodiment is another implementation mode of the present utility model:

[0055] The non-articular surface 11 of the tibial plateau is provided with two first reinforcing ribs 21 distributed along the X direction, and a certain distance is maintained between each pair of the first reinforcing ribs. The multiple reinforcing ribs 21 distributed in the X direction reduce the risk of fracture of the tibial plateau.

[0056] Further, in Figures 1 to 5 the illustrated embodiment, a wire groove 30 as shown in Figure 2 or a through hole 40 as shown in Figure 5 is formed on the first reinforcing rib 21, and a pit 111 with an unlimited shape is formed on the non-articular surface 11 of the tibial plateau to increase the contact area between the tibial plateau and the bone cement and enhance the fixing strength between the tibial plateau and the bone cement.

[0057] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0058] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A unicondylar knee tibial plateau prosthesis, characterized in that, The tibial plateau prosthesis includes a tibial plateau surface and reinforcing ribs connected to the non-articular surface of the tibial plateau; The reinforcing ribs are of a T-shaped structure or a π-shaped structure.

2. The unicondylar knee tibial plateau prosthesis according to claim 1, characterized in that, The reinforcing ribs include a first reinforcing rib and a second reinforcing rib; The first reinforcing rib is arranged along the length direction of the tibial plateau prosthesis, and the second reinforcing rib is perpendicular to the first reinforcing rib to form a T-shaped structure.

3. A unicondylar knee tibial plateau prosthesis according to claim 1, characterized in that, The reinforcing ribs include a plurality of first reinforcing ribs arranged in parallel; the first reinforcing ribs are arranged along the length direction of the tibial plateau prosthesis, and the length of the first reinforcing ribs is shorter than the distance in the length direction of the tibial plateau.

4. A unicondylar knee tibial plateau prosthesis according to claim 1, characterized in that, The reinforcing ribs include a first reinforcing rib and a second reinforcing rib; There are two second reinforcing ribs; The first reinforcing rib is parallel to the length direction of the tibial plateau, and both of the two second reinforcing ribs are perpendicular to the first reinforcing rib, and the two second reinforcing ribs are spaced apart by a certain distance.

5. A unicondylar knee tibial plateau prosthesis according to claim 1, wherein The reinforcing ribs include a first reinforcing rib and a plurality of second reinforcing ribs; The first reinforcing rib is parallel to the length direction of the tibial plateau, and the plurality of second reinforcing ribs are all perpendicular to the first reinforcing rib.

6. The unicondylar knee tibial plateau prosthesis according to claim 5, wherein The first reinforcing rib and the non-articular surface of the tibial plateau are integrally designed, and the plurality of second reinforcing ribs are slidably connected to the non-articular surface of the tibial plateau and the first reinforcing rib.

7. A unicondylar knee tibial plateau prosthesis according to claim 6, characterized in that, A dovetail structure is provided on the non-articular surface of the tibial plateau, a dovetail groove structure is provided on the first reinforcing rib, and the plurality of second reinforcing ribs are provided with dovetail / dovetail groove structures matching the dovetail groove / dovetail structure.

8. A unicondylar knee tibial plateau prosthesis according to any one of claims 1 - 7, characterized in that, The reinforcing ribs are provided with a wire groove or a through hole structure, and the non-articular surface of the tibial plateau is provided with a pit structure with an unlimited shape.

Images