CN213190331U - Single condyle knee joint prosthesis - Google Patents

Abstract

The utility model provides a single-condyle knee joint prosthesis, which comprises a femur condyle, a tibia pad and a tibia support, wherein the femur condyle is arranged on the tibia pad, and the femur condyle can rotate relative to the tibia pad; the tibia pad is connected with the tibia support through a sliding device, and the tibia pad can slide relative to the tibia support. The tibia support plays a role in supporting the tibia pad, and meanwhile, the problem that the tibia pad is easy to dislocate when sliding on the tibia support is solved. Through slider, the shin pad slides on the shin holds in the palm, and the shin pad can not break away from the shin and hold in the palm, can not appear dislocation phenomenon, and the stability of shin pad is good, and the wearing and tearing volume is little.

Description

Single condyle knee joint prosthesis

Technical Field

The utility model relates to the technical field of orthopedics medical science, in particular to a unicondylar knee joint prosthesis.

Background

The knee joint is the most complex joint of the human body, belongs to a pulley joint and is the most important load bearing joint of the lower limbs of the human body. In the face of severe knee joint disease, knee joint replacement surgery is a common disease treatment. The existing mobile platform unicondylar knee joint prosthesis comprises a femoral condyle, a tibial pad and a tibial tray, wherein the tibial pad has the risk of sliding out of the tibial tray, and the tibial pad has large abrasion loss, poor stability and easy dislocation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a unicondylar knee joint prosthesis. The existing knee joint prosthesis has the following problems,

the tibia support has the risk of slipping out of the tibia pad, and the tibia pad has large abrasion loss, poor stability and is easy to dislocate.

In order to solve the above technical problem, an embodiment of the present invention provides the following solutions:

a unicondylar knee prosthesis, comprising:

a femoral condyle;

the tibial pad is provided with a femoral condyle, and the femoral condyle can rotate relative to the tibial pad;

the tibia pad is connected with the tibia support through a sliding device and can slide relative to the tibia support.

The sliding device includes:

the dovetail groove is arranged on the bottom surface of the tibia pad;

the sliding groove is arranged on the top surface of the tibial tray, the bottom surface of the tibial pad is in contact with the top surface of the tibial tray, and the dovetail groove can slide in the sliding groove;

the tibial tray comprises tibial tray spherical particles, and the tibial tray spherical particles are arranged on the lower surface of the tibial tray;

wherein the femoral condyle comprises a femoral condyle spherical particle, the femoral condyle spherical particle being provided on an upper surface of the femoral condyle.

The lower surface of the femoral condyle is a femoral condyle curved surface, and the radius of the femoral condyle curved surface is a single curvature radius.

Wherein, the upper surface of the femoral condyle is provided with a femoral condyle upright post.

The upper surface of the tibial pad is a tibial pad concave curved surface, and the tibial pad concave curved surface is opposite to the femoral condyle curved surface.

Wherein, the lower surface of the tibia support is provided with a tibia support upright post.

Wherein, the femur condyle curved surface is a highly polished femur condyle curved surface.

Wherein, the tibia pad concave curved surface is a high-precision processing tibia pad concave curved surface.

The above technical scheme of the utility model at least include following beneficial effect:

the above technical scheme of the utility model, unicondylar knee joint prosthesis have good articular surface goodness of fit, and tibial pad sliding stability, wearing and tearing are little, do not dislocate.

Drawings

FIG. 1 is a schematic view of a unicondylar knee prosthesis of the present invention;

FIG. 2 is a schematic view of the femoral condyle of the unicondylar knee prosthesis of the present invention;

FIG. 3 is a schematic view of a tibial pad of the unicondylar knee prosthesis of the present invention;

fig. 4 is a first schematic structural view of a tibia tray of the unicondylar knee joint prosthesis of the present invention;

fig. 5 is a second schematic structural view of a tibial tray of the unicondylar knee prosthesis of the present invention.

Reference numerals:

10. a femoral condyle; 15. a tibial pad; 20. a tibial tray; 25. condylar-spherical particles of the femur; 30. a femoral condyle upright post; 35. femoral condyle surfaces; 40. a tibial pad concave curve; 45. a dovetail groove; 50. a chute; 55. a tibia support upright post; 60. tibial tray spherical particles.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1-5, the present embodiment provides a unicondylar knee prosthesis comprising a femoral condyle 10, a tibial pad 15, and a tibial tray 20, the femoral condyle 10 being disposed on the tibial pad 15, and the femoral condyle 10 being rotatable relative to the tibial pad 15; the tibial pad 15 is connected to the tibial tray 20 by a sliding mechanism, whereby sliding of the tibial pad 15 relative to the tibial tray 20 is achieved. The tibial pad 15 of the present embodiment is disposed on the tibial tray 20, and the tibial pad 15 is slid on the tibial tray 20 by a sliding device. The tibial tray 20 functions to support the tibial pad 15 and also solves the problem that the tibial pad 15 is easily dislocated when sliding on the tibial tray 20. There is no sliding device between the tibial tray 20 and the tibial pad 15, and when the tibial pad 15 slides on the tibial tray 20, the tibial pad 15 is forced by other factors, so that there is a risk that the tibial pad 15 slides off the upper surface of the tibial tray 20. Through the slider, the shin pad 15 slides on the shin plate 20, and the shin pad 15 can not break away from the shin plate 20, can not appear the dislocation phenomenon, and the stability of shin pad 15 is good, and the wearing and tearing volume is little.

As shown in fig. 3-4, the sliding device of the present embodiment includes a dovetail groove 45 and a sliding groove 50, the dovetail groove 45 being provided on the bottom surface of the tibial pad 15; the sliding slot 50 is disposed on the top surface of the tibial tray 20, the bottom surface of the tibial pad 15 is in contact with the top surface of the tibial tray 20, and the dovetail slot 45 is capable of sliding within the sliding slot 50. The bottom surface of the tibial pad 15 is provided with a dovetail groove 45, the upper surface of the tibial tray 20 is provided with a sliding groove 50, the dovetail groove 45 can be inserted into the sliding groove 50 and can move in the sliding groove 50, so that when the tibial pad 15 slides on the tibial tray 20, the dovetail groove 45 can not be separated from the groove of the tibial tray 20 all the time, and the problem of dislocation of the tibial pad 15 when sliding on the tibial tray 20 is solved.

As further shown in fig. 5, the tibial tray 20 of the present embodiment includes the femoral condylar spherical particles 25, and the tibial tray spherical particles 60 are disposed on the lower surface of the tibial tray 20. The sliding groove 50 is formed in the upper surface of the tibial tray 20 in this embodiment, so that the thickness of the sliding groove 50 of the tibial tray 20 is reduced, and the structure is weakened, and at this time, the femoral condyle spherical particles 25 are added to the lower surface of the tibial tray 20, so as to make up for the missing structure and the reinforcing performance of the groove on the tibial tray 20. Meanwhile, when the tibia support 20 is fixed by bone cement, the tibia support spherical particles 60 can increase the bonding strength of the fixation of the tibia support 20 and ensure that the tibia support 20 is not loosened after long-term use. In order to improve the initial stability of the tibial tray 20, the tibial tray columns 55 are arranged on the lower surface of the tibial tray 20 of the embodiment, preferably 3 tibial tray columns 55 are arranged, and the tibial tray columns 55 are optimally designed to enhance the structural performance of the tibial tray 20, reduce the fatigue failure risk and increase the initial stability of the prosthesis. Also, the tibial tray 20 is anatomically designed to provide better prosthetic fit for the anatomy.

As shown in FIG. 2, the femoral condyle 10 of the present embodiment is anatomical and provides better prosthetic fit. The femoral condyle 10 includes a femoral condyle spherical particle 25, the femoral condyle spherical particle 25 is disposed on the upper surface of the femoral condyle 10, and a femoral condyle upright 30 is further disposed on the upper surface of the femoral condyle 10. The femoral condyle spherical particle 25 and the femoral condyle post 30 of the femoral condyle 10 of the present embodiment increase the initial stability of the prosthesis and reduce the risk of loosening. The femoral condyle spherical particles 25 strengthen the femoral condyle 10, so that the femoral condyle has better mechanical properties, and the fatigue failure after long-term use is greatly reduced. The lower surface of the femoral condyle 10 is a femoral condyle curved surface 35, and the radius of the femoral condyle curved surface 35 is a single curvature radius. The femoral condyle curved surface 35 is highly polished, and is the highly polished femoral condyle curved surface 35. The single radius of curvature of the femoral condyle curved surface 35 may increase the contact area and reduce the contact stress; meanwhile, high polishing treatment is adopted, so that the abrasion coefficient is reduced.

As shown in fig. 1 and 3, the upper surface of the tibial pad 15 of the present embodiment is a tibial pad concave curved surface 40, the tibial pad concave curved surface 40 is disposed opposite to the femoral condyle curved surface 35, and the tibial pad concave curved surface 40 is a high-precision machined posterior tibial pad concave curved surface 40. The concave tibial pad surface 40 cooperates with the femoral condyle surface 35, and the concave tibial pad surface 40 provides a support surface for the rotation of the femoral condyle 10. The consistency of the tibial pad concave curved surface 40 and the femoral condyle curved surface 35 enables the femoral condyle 10 to have a large contact area all the time when rotating, and effectively reduces the contact stress. The highly polished femoral condyle curved surface 35 and the tibial pad concave curved surface 40 processed at high precision are matched for use, so that the abrasion of the tibial pad concave curved surface 40 is greatly reduced, the generation of abrasion particles is reduced, and the risks of infection and looseness after knee joint replacement are reduced.

The femoral condyle 10 of the present embodiment is made of cast cobalt-chromium-molybdenum alloy, the tibial pad 15 is made of ultra-high molecular weight polyethylene or VE high cross-linked ultra-high molecular weight polyethylene, and the tibial tray 20 is made of medical titanium alloy or cobalt-chromium-molybdenum alloy.

The unicondylar knee prosthesis has good articular surface goodness of fit, and the tibial pad 15 has the advantages of stable sliding, small abrasion and no dislocation.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A unicondylar knee prosthesis, comprising:

a femoral condyle;

the tibial pad is provided with a femoral condyle, and the femoral condyle can rotate relative to the tibial pad;

the tibia pad is connected with the tibia support through a sliding device and can slide relative to the tibia support;

the sliding device includes:

the dovetail groove is arranged on the bottom surface of the tibia pad;

the sliding groove is arranged on the top surface of the tibial tray, the bottom surface of the tibial pad is in contact with the top surface of the tibial tray, and the dovetail groove can slide in the sliding groove; the tibial tray comprises tibial tray spherical particles, and the tibial tray spherical particles are arranged on the lower surface of the tibial tray.

2. The unicondylar knee prosthesis of claim 1, wherein the femoral condyle comprises a femoral condylar spherical particle disposed on an upper surface of the femoral condyle.

3. The unicondylar knee prosthesis of claim 1, wherein the inferior surface of the femoral condyle is a femoral condyle curve having a radius of single radius of curvature.

4. The unicondylar knee prosthesis of claim 3, wherein the upper surface of the tibial pad is a tibial pad concave curve disposed opposite the femoral condylar curve.

5. The unicondylar knee prosthesis of claim 1, wherein a tibial tray post is provided on a lower surface of the tibial tray.

6. The unicondylar knee prosthesis of claim 4, wherein the femoral condylar curve is a highly polished posterior femoral condylar curve.

7. The unicondylar knee prosthesis of claim 4, wherein the tibial pad concave curve is a high-precision machined tibial pad concave curve.

8. The unicondylar knee prosthesis of claim 1, wherein the upper surface of the femoral condyle is provided with a femoral condyle post.

Images