Sulzer Orthopedics Inc.

Bernhard Gyssler

Vincent Leclercq

Tom Overes

Martin Aicher

Spreader apparatuses for knee joints are shown which have two parallel support plates ( ) which can be inserted between the femur condyles ( ) and the tibia ( ) and which can be moved apart in connected form by an adjustment mechanism ( ). The adjustment mechanism ( ) has a housing ( ) at which a stroke-extending tappet ( ) is supported via an elastically resilient transmission member ( ) in order to simultaneously make the effective spreading travel readable on a scale ( ) at the housing ( ) and the amount of the spreading force readable on a scale ( ) at the housing ( ).

Spreader apparatus for knee joints

A knee prosthesis has a medial condyle ( ) and a lateral condyle ( ), the running surfaces ( ) of which and the counter-surfaces A, B of which that lie on a tibia platform ( ) are sections of spherical surfaces with radii R , R , with their center M &prime; and M &prime; forming in their vertical projection onto the counter-surfaces A, B the points M , M . The lateral counter-surface B belongs to a lateral meniscus part ( ) which, guided on a plane ( ) of the tibia platform, is pivotal with the point M on a circular arc with radius R about the point M , with the radius R corresponding to the distance a of the centers M &prime;, M &prime;.

Knee implant

A mono-condylar knee joint prosthesis that includes a femur part having a convex running surface. The knee joint prosthesis further includes a tibia part having a sliding surface which faces the femur part and an intermediate part which is introduced between the femur part and the tibia part during implantation. The intermediate part has two bearing surfaces, namely a first, concave bearing surface for cooperating with the convex running surface of the femur part as well as a second bearing surface for cooperating with the sliding surface of the tibia part. A boundary surface is provided at the tibia part which bounds the sliding surface of the tibia part and projects pointing in the direction towards the femur part in order to be able to cooperate with a side surface of the intermediate part. The boundary surface which is provided at the tibia part is formed to be curved in the shape of an arch, and the intermediate part has a side surface which is curved corresponding to the boundary surface which is provided at the tibia part and which is curved in the shape of an arch.

Growing community of inventors

Horgen, Switzerland

Bernhard Gyssler