Tibia endoprosthesis

Abstract

The present invention provides a tibial prosthesis which comprises a tibial gasket which moves flat along the forward and the backward directions at a tibial support and the tibial support which is connected with a close end of the tibia. When a knee joint is at the complete knee extension position, the tibial gasket is under the free state along the forward and the backward directions at the tibial support. When the knee joint is over extended, the front positioning face of the tibial gasket is contacted with the inner surface of a front positioning block at the tibial support, so as to ensure that the tibial gasket forward movement distance is limited to avoid damaging the front soft tissue of the knee joint. When the knee joint is at the deep bending knee position, the back oblique positioning face of the tibial gasket is contacted with an incline at a back positioning block at the tibial support, so as to ensure that the tibial gasket backward movement distance is limited to avoid damaging the back tissue of the knee joint. At the same time, the back oblique positioning face of the tibial gasket is matched with the incline at the back positioning block at the tibial support, so as to prevent athe knee prosthesis dislocation caused by lifting the tibial gasket during the deep bending knee position of the knee joint.

Description

technical field [0001] The invention relates to a knee joint internal prosthesis, in particular to a tibial prosthesis applied to a human body. Background technique [0002] The so-called internal prosthesis of the knee joint includes two parts: the femoral prosthesis and the tibial prosthesis. Among them, the femoral prosthesis is connected to the distal end of the femur through a femoral mounting stem or screws, and has inner and outer condyles. The tibial prosthesis is divided into two parts, the tibial bearing and the tibial bearing. The tibial bearing is fixed at the proximal end of the tibia. The tibial lining is located between the femoral prosthesis and the tibial bearing. The articular surfaces of the condyles are matched with the articular surfaces of the inner and outer condyles of the femoral prosthesis to simulate the normal human natural knee joint movement process. [0003] For the human natural knee joint, due to the joint action of the surrounding soft tis...

AI Technical Summary

Problems solved by technology

In U.S. Patent No. 5,935,173, the posterior part of the tibial liner is lengthened, so that the front side of the tibial liner is not lifted when the knee joint is deeply flexed, effectively preventing dislocation of the knee prosthesis, but this patent does not limit the tibial liner to the tibial Front and rear translation distance on the support

In US Patent No. 6,797,005, the stop pin is designed to limit the anteroposterior translation distance of the tibial liner on the tibial bearing, which effectively prevents damage to the anterior and posterior soft tissues of the knee joint. side not lifted

In U.S. Patent No. 7,014,660, the stop block is only designed to limit the forward movement distance of the tibial pad on the tibial bearing, but it does not limit the posterior distance of the tibial pad on the tibial bearing, and it cannot guarantee the tibial pad The anterior side is not lifted during deep knee flexion

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