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Total-knee-joint replacement prosthesis

A technology of total knee replacement and prosthesis, applied in the direction of knee joints, elbow joints, joint implants, etc., can solve the problem of unstable combination of tibial tray and joint pad, short service life of knee joint replacement prosthesis, tibia Problems such as the sinking and rotation of the toy are easy to achieve the effects of facilitating metabolism, improving biocompatibility, and good long-term use stability

Active Publication Date: 2015-11-11
北京威高亚华人工关节开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing artificial knee prosthesis completely refers to the anatomical shape of the human knee joint, which mainly includes the femoral condyle prosthesis, the tibial tray prosthesis and the tibial pad. The following technical problems: 1. The initial stability of the femoral condyle, tibial tray, tibial pad, and patella is not good, and the force is unreasonable, resulting in a short service life of the knee replacement prosthesis; 2. The combination of the tibial tray and the joint pad is unstable, The tibial tray is easy to sink and rotate under the influence of human gravity; 3. The knee prosthesis lacks substances that induce bone cell growth, and it is simply fixed by the prosthesis itself, and the safety is not high

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] The present invention provides a total knee replacement prosthesis, such as Figure 1 to Figure 6 As shown, the total knee replacement prosthesis includes a femoral condyle 1, a tibial pad 2, a tibial tray 3, and a patella 4, and the tibial pad 2 is high cross-linked polyethylene, wherein,

[0038] The femoral condyle 1 includes the medial condyle 11, the lateral condyle 12, the articular surface 13 defined jointly by the distal ends of the medial condyle 11 and the lateral condyle 12, an intercondylar box 16 located between the medial condyle 11 and the lateral condyle 12, and an intercondylar box located between the medial condyle 11 and the lateral condyle 12. The condyles on both sides of 16 join the inner surface 17; the distal ends of the medial condyle 11 and the lateral condyle 12 are connected by a stopper 14, and after the proximal ends meet, they extend to form a femoral trochlea 15, and the lower end surface of the femoral trochlea 15 forms a patellar trochle...

Embodiment 2

[0047] The present invention provides a total knee replacement prosthesis, which is different from Example 1 in that, as Figure 7 As shown, the limiting column 21 and the fixing keel 32 are arranged on the same straight line perpendicular to the support plate 31 , and the straight line passes through the end point of the second column 35 closest to the first column 34 . In this way, the longitudinal force on the tibial pad is more reasonable, transmitted to the tibial tray and dispersed through the fixed keel at the lower part of the tibial tray, and at the same time minimizes the lateral force on the support plate caused by the uneven force exerted by the femoral condyle on the tibial pad Torsion effect, which increases the lifespan of total knee replacement prostheses.

Embodiment 3

[0049] The present invention provides a total knee replacement prosthesis, such as Figure 8 As shown, the difference between this total knee replacement prosthesis and embodiment 1 is that the structure of the tibial support 3 is as follows Figure 7 As shown, the tibial interface 36 includes a second cement pocket 362 defined by a protrusion 361 formed in a peripheral portion. Wherein, both the second bone cement tank 362 and the first bone cement tank 151 are filled with bone cement. The bone cement consists of the following raw materials in mass percentage: magnesium oxide 15%-30%, titanium chloride 15%-25%, hydroxyethyl methylcellulose 2%-4.5%, polyvinylpyrrolidone 10%-15% %, collagen 10%-15%, chitin 0.5%-1%, polyvinyl alcohol 1.1%-2%, and deionized water 20%-30%.

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Abstract

The invention discloses total-knee-joint replacement prosthesis which comprises a femoral condyle, a tibia support, a tibia pad and a patella. The femoral condyle comprises an internal condyle, an external condyle, a joint surface, an intercondylar box and a condyle inside joint internal surface. The tibia pad is provided with a limiting stand column and glenoid cavities. The glenoid cavities define the shape of a glenoid cavity face. The shape of the glenoid cavity face is matched with the articular surface of the femoral condyle. The lower end face of the tibia pad is provided with a first groove and a second groove. The tibia support comprises a supporting disk with a fixing component. The upper surface of the supporting disk is provided with a first supporting pillar and a second supporting pillar which are matched with the tibia pad in a locked mode. The patella comprises a patella articular surface and a patella fixing stand column. The total-knee-joint replacement prosthesis has very good initial stability and long-term use stability, biocompatibility is improved, metabolism of bones is facilitated, resistance to subsidence of the tibia support, resistance to revolving resistance and long-term use stability are improved, the binding force of the tibia support and the tibia pad is further improved, and the service life of the knee joint is further prolonged.

Description

technical field [0001] The invention relates to a joint prosthesis, in particular to a total knee joint replacement prosthesis. Background technique [0002] The knee joint is a joint with a large body, complex structure, and high requirements for motion function; artificial knee replacement is a surgical operation that removes the worn, diseased or damaged surface of the knee joint and replaces it with an artificial knee joint. In the case of surgery, the tibial tray is implanted in the patient's tibia, and then the tibial tray is fixed on the tibial tray, and the condylar surface of the patient's femoral condyle abuts on the tibial tray, which has become a commonly used operation in clinical practice, and in the treatment of Remarkable success has been achieved in knee joint disease. [0003] The existing artificial knee prosthesis completely refers to the anatomical shape of the human knee joint, which mainly includes the femoral condyle prosthesis, the tibial tray prost...

Claims

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Application Information

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IPC IPC(8): A61F2/38
Inventor 杨桂庆吕心建刘博史树奎
Owner 北京威高亚华人工关节开发有限公司
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