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Total knee prosthesis

A knee prosthesis and prosthesis technology, applied in the field of novel total knee prosthesis, can solve problems such as support asymmetry

Inactive Publication Date: 2011-06-29
米歇尔·贝尔科维 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in this knee prosthesis, the support of the medial and lateral condyles in the glenoid of the insert is asymmetrical, creating several sources of problems

Method used

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Embodiment Construction

[0049] As is obvious from the drawings, the object of the present invention relates to a total knee prosthesis 1. The total knee prosthesis 1 conventionally includes a femoral implant 2, a tibial implant 3 and a joint insert 4, and a femoral implant 2 Both the tibial implant 3 and the tibial implant 3 are preferably composed of a biocompatible stainless steel metal alloy, and the joint insert 4 is usually a plastic material such as polyethylene. However, one or more elements in this prosthesis may also be composed of, for example, alumina porcelain or aluminum and zirconia porcelain or biocompatible resins.

[0050] Both the femoral implant 2 and the tibial implant 3 are intended to be adjusted to the hypoepiphysis of the femur and the epiphysis of the tibia respectively after resection.

[0051] Such as figure 2 As shown in the middle part, the femoral implant 2 viewed from the side is in a substantially asymmetrical U shape, and the U-shaped branches define a shell 5 that is use...

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Abstract

The present invention relates to a total knee prosthesis. This prosthesis comprises a femoral implant (2) with two condyles (8, 9) delimiting between them an intercondylar notch (10), a tibial implant (3) designed to rest on the end of the tibia, and an articular insert (4) which is interposed between the tibial implant and the femoral implant and whose upper surface (41) comprises two glenoid cavities (18, 19) that have an outer profile (181, 191) matching the outer profile (81, 91) of the condyles (7, 8) of the femoral implant and that are connected to each other by an interglenoid connection surface (20). According to the invention, the intercondylar notch (10) and the interglenoid connection surface (20) have matching contact surfaces (101, 201) which are inscribed within two complementary hyperbolic paraboloids, and the contact surface (181, 191) of the glenoid cavities (18, 19) has an ovoid shape in horizontal section, and its declivity point (P) is situated posteriorly with respect to the line of greatest width (L) of the insert.

Description

Technical field [0001] The present invention relates to the field of joint prostheses, and more specifically to the specific field of novel total knee prostheses. Background technique [0002] The prosthesis of the knee joint must be designed according to two main rules: [0003] -Tribological rules: they must withstand minimal wear during use; [0004] -Kinematics rules: The operation of the prosthesis should make the patient as comfortable as possible in all daily activities. [0005] First, tribology should conform to kinematics, and conversely, kinematics should follow tribology. The present invention is positioned within the scope of this double reverse constraint. [0006] In the field of knee prostheses, many proposals for total knee prostheses have been proposed in the prior art. These total knee prostheses traditionally consist of three functional elements: a femoral element, which is intended to be implanted on the lower end of the femur; a tibial element, which is suitable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/38
CPCA61F2310/00203A61F2002/30952A61F2002/30934A61F2/3868A61F2310/00239A61F2310/00179
Inventor 米歇尔·贝尔科维戴维·布雷西吕克·凯布尔
Owner 米歇尔·贝尔科维
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