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Coupled knee prosthesis with a rotational bearing

A technology of rotating support and knee prosthesis, which is applied in the field of knee prosthesis and can solve the problems of unfavorable force on the rotating support

Inactive Publication Date: 2007-11-21
WALDEMAR LINK GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is very unfavorable for the force of the rotating bearing

Method used

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  • Coupled knee prosthesis with a rotational bearing
  • Coupled knee prosthesis with a rotational bearing
  • Coupled knee prosthesis with a rotational bearing

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Embodiment Construction

[0013] The prosthesis comprises a femoral part 1 and a tibial part 2 which are fixed in the femur or tibia by means of pins 3 or 4 . The direction 5 of the pin 4 defines the tibial direction. The load is transmitted from the femoral part 1 to the tibial part 2 via the slider 6 of the femur and a tibial plateau 7 in each flexed leg position. For stabilization, the femoral part and the tibial part are connected to each other via an intermediate part 10, which forms a hinge as a connection with the femoral part 1, whose axis 11 coincides with the axis of flexion of the leg and with the tibial part 2. A swivel bearing with an axis of rotation 12 is formed. The swivel bearing comprises a pin 15 of the intermediate part 10 and a hole in the tibial part with a sliding sleeve 14, for example made of polyethylene, which accommodates the pin 15 with a sliding fit. The axis of rotation 12 encloses an angle α in the sagittal plane with the tibial direction 5 of the prosthesis, which in ...

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Abstract

The invention relates to a knee prosthesis comprising a femur component (1) with condylar sliding surfaces (20) which are rigidly interconnected, a tibial component (2) provided with a tibial platform (7) which is linked to the former in a non-rotatable manner and which exhibits tibial sliding surfaces (21) which cooperate with the condylar sliding surfaces (20). Said prosthesis also comprises a coupling device (10) which forms a flexing bearing (11) with the femur component (1) and a rotational bearing (12) with the tibial component (2), the axis (12) of said rotational bearing being inclined in the tibial direction (5). The invention aims to achieve a more advantageous distribution of power in the prosthesis and a restoring force when the prosthesis parts rotate. To do so, in the region (24) of the tibial sliding surfaces (21), which is responsible for carrying most of the load in the extended position and which cooperates with the condylar sliding surfaces (20), the normal (25) is less inclined relative to the tibial direction (5) than the axis (12) of the rotational bearing, in the lateral view or sagittal section.

Description

technical field [0001] The invention relates to a knee prosthesis which is equipped with a connecting mechanism which forms a flexion bearing with the femoral part and a rotational bearing with the tibial part. The flexion support limits the movement of these two parts about the transverse axis when the leg is flexed. A swivel bearing whose axis runs approximately parallel to the direction of the tibia allows a certain amount of rotation about a vertical axis. Background technique [0002] Knee prostheses are known whose femoral and tibial parts have different degrees of freedom of movement from each other. The lower the residual stability of the knee to be prosthesized, the more stable the prosthesis must be and the less freedom is given to relative movement between these two components, or vice versa. This limitation of the degrees of freedom is achieved by a connection mechanism acting between the femoral part and the tibial part. [0003] Axial forces are transmitted ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/38A61F2/64A61F2/00A61F2/30
CPCA61F2/384A61F2002/30574A61F2002/30878A61F2002/30354A61F2002/30372A61F2220/0033A61F2/385A61F2002/30474A61F2002/30364A61F2/389A61F2220/0025A61F2/3859A61F2/38
Inventor A·凯尔勒
Owner WALDEMAR LINK GMBH & CO
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