Unicondylar prosthesis

Abstract

The application provides a single condyle prosthesis, which comprises a platform part, a side wall of the platform part comprising a planar side wall and an arc-shaped side wall, a flexible piece arranged on the platform part, an upper surface of the flexible piece forming a supporting surface, a connecting plate arranged on the platform part and located at a side of the flexible piece, the connecting plate being arranged adjacent to the planar side wall and having a spacing between the connecting plate and the planar side wall, a convex edge being arranged on a side of the connecting plate away from the platform part, the convex edge protruding towards the planar side wall, and a containing groove being formed between the convex edge, the connecting plate and the platform part. The technical scheme of the application effectively solves the problem of poor fixing effect of the single condyle prosthesis in the related art.

Description

Technical Field

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

[0002] The knee joint is a vital weight-bearing joint in the lower limbs, and its structure and function are among the most complex of all joints in the human body. Osteoarthritis of the knee is a common disease among the elderly. An increasing number of patients with severe knee osteoarthritis require total knee replacement surgery. Knee replacement surgery can relieve knee pain, improve knee function, correct knee deformities, and achieve long-term stability.

[0003] People who engage in heavy physical labor or strenuous jumping exercises are prone to knee joint damage. The main symptoms include synovitis, cruciate ligament tears, meniscus injuries, and cartilage damage. People whose knees are frequently exposed to cold are prone to chronic knee diseases, such as pigmented villonodular synovitis and chronic synovitis. These conditions are clinically considered intractable, with no specific cures, and surgery is the only treatment option.

[0004] Unicompartmental knee replacement surgery utilizes minimally invasive surgery (MIS) techniques to reduce pain, enable early mobilization, shorten hospital stays, facilitate rapid rehabilitation, and allow for early functional recovery.

[0005] Unicompartmental knee arthroplasty is a novel minimally invasive surgical procedure in knee surgery. It involves replacing the diseased unicompartment of the knee joint with an artificial one, while preserving the normal ligaments and other tissues. In elderly patients with knee osteoarthritis, the medial compartment is most commonly affected in the early stages, while the lateral compartment and patellar joint have a better prognosis. In such cases, unicompartmental knee arthroplasty can replace the affected medial compartment, thus curing the disease while preserving the normal lateral and patellar joint.

[0006] The meniscus is an important structural component of the knee joint. Located on the articular surface of the tibia, there are medial and lateral crescent-shaped cartilages called the menisci. The periphery is thicker and tightly connected to the joint capsule, while the central portion is thinner and more free. Except for injuries to the periphery, which can repair themselves, meniscal tears cannot heal spontaneously. After meniscal removal, a thin, narrow, fibrocartilaginous meniscus can regenerate from the synovium. A normal meniscus increases the tibial condyle depression and cushions the medial and lateral femoral condyles, increasing joint stability and cushioning shocks. The meniscus plays a vital role in damping shocks, transmitting loads, and stabilizing the joint. Meniscal injuries have become one of the most common sports injuries worldwide, and because they cannot heal on their own, they severely impact the daily activities and quality of life of those who have undergone meniscus implantation.

[0007] The meniscus has a semi-circular structure, thicker at the outer periphery and thinner and sharper at the inner edge. Its upper surface is concave, conforming to the femoral condyle, while its lower surface is flat, conforming to the tibial plateau. Because of the meniscus, the knee joint is divided into two connections: the femoral-meniscus connection and the meniscus-tibialis connection. The meniscus primarily attaches to the tibia but can move within a certain range with the femur. Its morphological characteristics compensate for the mismatch between the tibial and femoral condyles, increasing joint stability and preventing surrounding soft tissues from being compressed into the joint. The meniscus is grayish-white, smooth and shiny, tough, and has a certain degree of elasticity. It cushions the impact between the two bone surfaces, absorbs shock, distributes synovial fluid, increases lubrication, reduces friction, and protects the joint.

[0008] When the knee is extended, the meniscus is pushed forward by the femoral condyles and moves backward when the knee is flexed. During knee rotation, one meniscus moves forward and the other backward. During knee flexion and extension, the medial and lateral femoral condyles move above the meniscus; during knee rotation, the meniscus is fixed below the medial and lateral malleoli, and its rotation occurs between the underside of the meniscus and the tibial plateau. Therefore, meniscal tears mostly occur on the underside of the plate, and rotational movement is the main cause of meniscal tears.

[0009] Meniscus injury is a common sports injury, and its treatment should emphasize individualized approaches. The appropriate treatment plan and timing should be selected based on the patient's injury location, severity, and occupational requirements. Current treatment principles aim to preserve meniscus tissue and function as much as possible, generally divided into non-surgical and surgical treatment. Non-surgical treatment is mainly suitable for stable longitudinal meniscus tears with small gaps and no obvious clinical symptoms; conservative treatment can be considered in these cases.

[0010] In related technologies, unicompartmental prostheses are fixed only by screws, which can easily lead to detachment after long-term use, meaning that the fixation effect of unicompartmental prostheses is poor. Summary of the Invention

[0011] The main objective of this invention is to provide a unicompartmental prosthesis to solve the problem of poor fixation effect of unicompartmental prostheses in related technologies.

[0012] To achieve the above objectives, the present invention provides a unicompartment prosthesis, comprising: a platform portion, the sidewalls of which include planar sidewalls and arcuate sidewalls; a flexible member disposed on the platform portion, the upper surface of which forms a support surface; a connecting plate disposed on the platform portion and located on the side of the flexible member, the connecting plate being adjacent to and spaced from the planar sidewalls, and a protruding edge being provided on the side of the connecting plate away from the platform portion, the protruding edge protruding toward the planar sidewalls; and a receiving groove formed between the protruding edge, the connecting plate, and the platform portion.

[0013] Furthermore, the connecting plate is inclined, with the connecting plate inclined toward the planar side wall.

[0014] Furthermore, the sidewall of the protruding edge away from the connecting plate is flush with the planar sidewall.

[0015] Furthermore, in the direction from the first end of the planar sidewall to the second end of the planar sidewall, the distance between the convex edge and the platform gradually increases.

[0016] Furthermore, the included angle between the connecting plate and the platform is between 5° and 30°.

[0017] Furthermore, the unicompartmental prosthesis also includes a first porous structure disposed within a receiving groove.

[0018] Furthermore, the unicompartmental prosthesis also includes a second porous structure, which includes a first layer structure and a second layer structure. The first layer structure is disposed on the first surface of the platform portion and located on the side of the connecting plate, and the second layer structure is disposed on the second surface of the platform portion opposite to the first surface.

[0019] Furthermore, the thickness of the first layer is less than the thickness of the second layer.

[0020] Furthermore, the flexible component includes a first flexible portion and a second flexible portion, the first flexible portion covering the outside of the second flexible portion, and the rigidity of the first flexible portion being less than the rigidity of the second flexible portion.

[0021] Furthermore, a portion of the structure of the second flexible part covers a portion of the protruding edge, while the first flexible part covers the entire protruding edge.

[0022] Furthermore, the unicompartmental prosthesis also includes a connecting post, which is disposed on the second surface of the platform portion and is inclined.

[0023] Furthermore, the receiving groove has a first opening at the first end of the planar sidewall, and a second opening at the second end of the receiving groove on the planar sidewall. The height of the first opening is less than the height of the second opening, and the connecting column extends toward the first end of the planar sidewall.

[0024] The technical solution of this invention includes an arc-shaped sidewall and a planar sidewall on the platform portion. A flexible member is disposed on the platform portion, and a connecting plate is disposed on the platform portion and located on the side of the flexible member. A raised edge is provided on the side of the connecting plate away from the platform portion, and a receiving groove is formed between the raised edge, the connecting plate, and the platform portion. The surface of the flexible member forms a support surface. Through the above arrangement, the receiving groove contacts the autologous bone structure, allowing the autologous bone structure to grow into the receiving groove, thus making the position of the unicompartmental prosthesis more stable. Therefore, the technical solution of this application effectively solves the problem of poor fixation effect of unicompartmental prostheses in related technologies. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the unicompartmental prosthesis according to the present invention is shown;

[0027] Figure 2 It shows Figure 1 A frontal view of a unicompartmental prosthesis;

[0028] Figure 3 It shows Figure 1 A side view of a unicompartmental prosthesis;

[0029] Figure 4 It shows Figure 1 A top view of a unicompartmental prosthesis;

[0030] Figure 5 It shows Figure 1 A three-dimensional structural diagram of a unicompartmental prosthesis with flexible components installed;

[0031] Figure 6 It shows Figure 5 A cross-sectional schematic diagram of a unicompartmental prosthesis.

[0032] The above figures include the following reference numerals:

[0033] 10. Platform section; 11. Planar sidewall; 12. Arc-shaped sidewall; 20. Flexible component; 21. First flexible section; 22. Second flexible section; 30. Connecting plate; 31. Protruding edge; 40. Receiving groove; 41. First opening; 42. Second opening; 50. First porous structure; 60. Second porous structure; 61. First layer structure; 62. Second layer structure; 70. Connecting column. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] like Figures 1 to 5 As shown, in this embodiment, the unicompartmental prosthesis includes: a platform portion 10, a flexible member 20, a connecting plate 30, and a receiving groove 40. The sidewalls of the platform portion 10 include a planar sidewall 11 and an arcuate sidewall 12. The flexible member 20 is disposed on the platform portion 10, and its upper surface forms a support surface. The connecting plate 30 is disposed on the platform portion 10 and located on the side of the flexible member 20. The connecting plate 30 is disposed adjacent to the planar sidewall 11 and has a gap between it and the planar sidewall 11. A protruding edge 31 is provided on the side of the connecting plate 30 away from the platform portion 10, and the protruding edge 31 protrudes toward the planar sidewall 11. The receiving groove 40 is formed between the protruding edge 31, the connecting plate 30, and the platform portion 10.

[0038] Applying the technical solution of this embodiment, the sidewalls of the platform portion 10 include an arc-shaped sidewall 12 and a planar sidewall 11. A flexible member 20 is disposed on the platform portion 10, and a connecting plate 30 is disposed on the platform portion 10 and located on the side of the flexible member 20. A protruding edge 31 is provided on the side of the connecting plate 30 away from the platform portion 10, and a receiving groove 40 is formed between the protruding edge 31, the connecting plate 30, and the platform portion 10. The surface of the flexible member 20 forms a support surface. Through the above arrangement, the receiving groove 40 contacts the bone structure itself, allowing the bone structure to grow into the receiving groove 40, thus making the position of the unicompartmental prosthesis more stable. Therefore, the technical solution of this embodiment effectively solves the problem of poor fixation effect of unicompartmental prostheses in related technologies.

[0039] It should be noted that, as Figure 4 As shown, the above-mentioned "connecting plate 30 is arranged adjacent to the planar side wall 11 and has a gap between it and the planar side wall 11" means drawing the vertical bisector a of the planar side wall 11. The intersection points of the vertical bisector a with the arc-shaped side wall 12 and the planar side wall 11 are points A and B, respectively. The intersection point of the vertical bisector a with the connecting plate is point C. AC≥4BC.

[0040] like Figures 1 to 5 As shown, in this embodiment, the connecting plate 30 is inclined, and the connecting plate 30 is inclined toward the planar sidewall 11. The distance between the connecting plate 30 and the platform portion 10 gradually increases in the direction from the arc-shaped sidewall 12 to the planar sidewall 11. This arrangement balances connection stability and structural strength, and the larger space of the receiving groove 40 further enhances the fixing effect.

[0041] like Figures 1 to 5 As shown, in this embodiment, the sidewall of the protruding edge 31 away from the connecting plate 30 is flush with the planar sidewall 11. This arrangement enables a more stable connection between the unicompartmental prosthesis and the body's own bone structure.

[0042] like Figures 1 to 5 As shown, in this embodiment, the distance between the convex edge 31 and the platform portion 10 gradually increases in the direction from the first end of the planar sidewall 11 to the second end of the planar sidewall 11. This arrangement allows for better matching with the bone structure, thus ensuring a smooth connection.

[0043] like Figures 1 to 5 As shown, in this embodiment, the included angle between the connecting plate 30 and the platform portion 10 is between 5° and 30°. This arrangement enables better fixation. Specifically, in this embodiment, the included angle between the connecting plate 30 and the platform portion 10 is 15°, but it can also be 10°, 20°, or 25°, etc.

[0044] like Figures 1 to 6As shown, in this embodiment, the unicompartmental prosthesis also includes a first porous structure 50, which is disposed within the receiving groove 40. The first porous structure 50 allows for better ingrowth into the bone structure, resulting in a more stable connection. Specifically, the porosity of the first porous structure 50 is 50-80%, the diameter of the beams forming the mesh is 0.3-0.6 mm, and the pore size is 0.4-1 mm.

[0045] like Figures 1 to 6 As shown, in this embodiment, the unicompartmental prosthesis further includes a second porous structure 60, which comprises a first layer structure 61 and a second layer structure 62. The first layer structure 61 is disposed on the first surface of the platform portion 10 and located on the side of the connecting plate 30, and the second layer structure 62 is disposed on the second surface of the platform portion 10 opposite to the first surface. This arrangement further ensures the connection between the platform portion 10 and its own bone structure. The porosity of the second porous structure 60 is 50-80%, the beam diameter is 1-1.5 mm, and the pore diameter is 1.5-3 mm.

[0046] like Figure 6 As shown, in this embodiment, the thickness of the first layer 61 is less than the thickness of the second layer 62. This arrangement provides both a connecting effect and a supporting effect.

[0047] like Figure 6 As shown, in this embodiment, the flexible member 20 includes a first flexible portion 21 and a second flexible portion 22. The first flexible portion 21 covers the outside of the second flexible portion 22, and the rigidity of the first flexible portion 21 is less than that of the second flexible portion 22. The arrangement of the first flexible portion 21 and the second flexible portion 22 can provide better support, thus ensuring the support effect.

[0048] Specifically, in this embodiment, the second flexible portion 22 overlaps the connecting plate 30 and the flange 31, and a portion of the sidewall of the second flexible portion 22 is flush with the sidewall of the flange 31. The first flexible portion 21 overlaps the second flexible portion 22 located on the flange 31 and the flange 31 to which the second flexible portion 22 is not overlapped. A portion of the sidewall of the first flexible portion 21 is flush with the sidewall of the flange 31.

[0049] The aforementioned coverage includes partial coverage and full coverage. Partial coverage means that part of the sidewalls of the first flexible part 21 and the second flexible part 22 are flush with the protrusion. Full coverage means that the second flexible part 22 is completely located inside the first flexible part 21.

[0050] like Figure 6As shown, in this embodiment, the flexible component 20 is made of polyurethane. Polyurethane material has good stability, and its deformation capacity and strength meet the requirements for long-term use. Furthermore, the flexible component 20 can be made of polyurethane TPU material. These materials have good ductility, tensile strength, wear resistance, and biocompatibility, thus achieving good bonding with the trabecular bone layer and ensuring the overall performance of the prosthesis during long-term implantation.

[0051] like Figure 6 As shown, in this embodiment, a portion of the structure of the second flexible part 22 covers a portion of the protruding edge 31, and the first flexible part 21 covers the entire protruding edge 31. This arrangement prevents the protruding edge 31 from directly contacting its own bone structure, thus avoiding damage to the bone structure.

[0052] like Figures 1 to 6 As shown, in this embodiment, the unicompartmental prosthesis also includes a connecting post 70, which is disposed on the second surface of the platform portion 10 and is inclined. The connecting post 70 further ensures the stability of the connection.

[0053] like Figures 1 to 6 As shown, in this embodiment, the receiving groove 40 has a first opening 41 at the first end of the planar sidewall 11, and a second opening 42 at the second end of the receiving groove 40 located on the planar sidewall 11. The height of the first opening 41 is less than the height of the second opening 42, and the connecting post 70 extends toward the first end of the planar sidewall 11. This configuration allows for greater stability of the unicompartment prosthesis. After implantation, the autologous bone structure can grow into the receiving groove 40. During the growth of the autologous bone structure, it will be compressed towards the first opening 41. This causes the platform portion 10 to tend to move toward the first end of the planar sidewall 11 under stress. Furthermore, since the connecting post 70 extends toward the first end of the planar sidewall 11, its position is more stable, thus ensuring the stability of the unicompartment prosthesis.

[0054] Specifically, in this embodiment, such as Figure 3 As shown, the angle α between the convex edge and the platform portion and the angle β between the connecting post and the platform portion have the following relationship:

[0055] The ratio of 1:7 ≤ angle α: angle β ≤ 1:3 can achieve a locking effect, that is, the autologous bone structure can grow into the receiving groove 40. During the growth of the autologous bone structure, it will be squeezed towards the first opening 41. This will cause the platform part 10 to be stressed and tend to move towards the first end of the planar sidewall 11. Since the connecting post 70 extends towards the first end of the planar sidewall 11, the position of the connecting post 70 can be made more stable, thereby ensuring the stability of the position of the unicompartmental prosthesis.

[0056] Preferably, the ratio of included angle α to included angle β is 1:5, but it can also be 1:4, 1:6, or other ratios.

[0057] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A unicompartmental prosthesis, characterized in that, include: Platform section (10), the sidewalls of which include planar sidewalls (11) and arcuate sidewalls (12). A flexible component (20) is disposed on the platform portion (10), and the upper surface of the flexible component (20) forms a support surface; A connecting plate (30) is disposed on the platform part (10) and located on the side of the flexible member (20). The connecting plate (30) is disposed adjacent to the planar sidewall (11) and has a gap between it and the planar sidewall (11). A protruding edge (31) is provided on the side of the connecting plate (30) away from the platform part (10), and the protruding edge (31) protrudes toward the planar sidewall (11). A receiving groove (40) is formed between the protruding edge (31), the connecting plate (30), and the platform portion (10); The unicompartmental prosthesis also includes a first porous structure (50), which is disposed within the receiving groove (40).

2. The unicompartmental prosthesis according to claim 1, characterized in that, The connecting plate (30) is inclined and is inclined toward the planar sidewall (11).

3. The unicompartmental prosthesis according to claim 1, characterized in that, The protruding edge (31) is flush with the side wall away from the connecting plate (30) and the planar side wall (11).

4. The unicompartmental prosthesis according to claim 1, characterized in that, In the direction from the first end of the planar sidewall (11) to the second end of the planar sidewall (11), the distance between the convex edge (31) and the platform portion (10) gradually increases.

5. The unicompartmental prosthesis according to claim 1, characterized in that, The included angle between the connecting plate (30) and the platform part (10) is between 5° and 30°.

6. The unicompartmental prosthesis according to any one of claims 1 to 5, characterized in that, The unicompartmental prosthesis also includes a second porous structure (60), which includes a first layer structure (61) and a second layer structure (62). The first layer structure (61) is disposed on the first surface of the platform portion (10) and located on the side of the connecting plate (30). The second layer structure (62) is disposed on the second surface of the platform portion (10) opposite to the first surface.

7. The unicompartmental prosthesis according to claim 6, characterized in that, The thickness of the first layer structure (61) is less than the thickness of the second layer structure (62).

8. The unicompartmental prosthesis according to claim 1, characterized in that, The flexible component (20) includes a first flexible part (21) and a second flexible part (22), wherein the first flexible part (21) covers the outside of the second flexible part (22), and the rigidity of the first flexible part (21) is less than that of the second flexible part (22).

9. The unicompartmental prosthesis according to claim 8, characterized in that, A portion of the structure of the second flexible portion (22) covers a portion of the protruding edge (31), and the first flexible portion (21) covers all of the protruding edge (31).

10. The unicompartmental prosthesis according to claim 1, characterized in that, The unicompartmental prosthesis also includes a connecting post (70), which is disposed on the second surface of the platform portion (10) and is inclined.

11. The unicompartmental prosthesis according to claim 10, characterized in that, The receiving groove (40) has a first opening (41) at the first end of the planar sidewall (11), and the receiving groove (40) has a second opening (42) at the second end of the planar sidewall (11). The height of the first opening (41) is less than the height of the second opening (42), and the connecting column (70) extends toward the first end of the planar sidewall (11).

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