Ceramtec Gmbh

Spontech Spine Intelligence Ag

Thomas Pandorf

Roman Preuss

Patricie Merkert

Martin Pabst

Martin Dietrich

Heike Idink

Lino Taddia

Marcus Spitsenberg

Christoph Kohlbrenner

Yvonne Bläske

Marcus Spitzenberg

Thomas BÖGEL

The invention relates to an acetabular cup () and a cup insert () for a hip joint prosthesis (), wherein the cup insert () is coupled to the acetabular cup by means of a clamping cone () of a conical clamping device in the equatorial region () of the two components () and, in the unloaded state of the cup insert (), a gap () is provided between the two components () below the clamping cone () to the pole (), said gap being delimited by the radial contours of the two components (). In order to reduce the tensile stresses in the cup insert, the radial contours of the two components () have identical geometric elements in the same order, starling front the lower cone end () to the pole (), and tangential or substantially tangential transitions exist between the geometric elements.

Increasing the breaking load of ceramic cup inserts for hip joint prostheses by a defined back side collision of the cup insert and acetabular cup

An expandable cage for intercorporal fusion of lumbar vertebrae comprises a main body with two expandable parallel arms. Each arm has a supporting surface pointing outside and configured to contact an adjacent vertebral body, a groove pointing inside and extending along a transverse direction, and a channel pointing inside and extending along a longitudinal direction. An expansion element is instrument actuated and presses the arms apart expanding the cage. The expansion element is between the arms and comprises a cylindrical base body, two opposing radially aligned ribs on the base body, and a rectangular plate. Both the base body and ribs have curved, pair-wise opposed bearing surfaces. Depending on the cage's expansion state, either the base body bearing surfaces or the rib bearing surfaces contact channels provided in the arms, while the plate engages in the grooves of the arms.

Expandable cage for the interbody fusion of lumbar vertebrae

A socket or socket insert for a hip joint prosthesis, the shaft of which can be coupled with a ball head which in turn can be inserted in a rotatable manner in the hemispherical recess of the socket insert wherein the shaft can be implanted in the femur and the socket insert can be implanted directly or via a hip socket in the pelvic bone. To avoid squeaking, the socket and/or the socket insert are asymmetrically in their inner or outer geometries.

Asymmetric formation of sockets and/or socket inserts for the manipulation and supression of natural frequencies

A hip socket for use in a hip joint prosthesis comprising a shaft on which a ball head may be fixed, the ball head may be rotatably inserted in a socket insert and the socket insert may be inserted and fixed in the hip socket the shaft and the hip socket being implantable in the thigh bone and the pelvic bone respectively. Damages to the socket insert and/or limitation of the function of the sliding pair of ball head/socket insert may be avoided by local reduction of the calotte diameter of the socket insert, such that the hip socket has an asymmetrical design with regard to the stiffness and/or geometry thereof in two different directions (x, y) orthogonal to each other and to the symmetry axis (z) of the hip socket.

Asymmetric design of hip socket for reducing socket deformations

A socket insert of a hip joint prosthesis having a spherical-indentation-shaped recess in which a spherical head of a femur is mounted. The spherical indentation has a run-in zone which ends on one side with a circular arc tangentially in an end face of the socket insert and extends on another side as far as the run-in edge. Between a start of the circular arc with a radius of the length (R) and the run-in edge of the spherical indentation with the radius of the length (R) the run-in zone forms a curve, the function of which is continuously differentiated twice at every point.

Reduction of the development of stripe wear on inserts for hip joint prostheses by modifying the geometry of the transition between the face and spherical recess

A hip joint prosthesis with a shaft fastened on the shaft head of which there is a ball head which in turn is inserted in a rotatable manner in the spherical recess of a socket insert and the socket insert is coupled with a hip socket wherein the shaft can be implanted in the femur and the hip socket can be implanted in the pelvic bone. To avoid transmission of vibrations, damping elements of a vibration-damping material are arranged at the coupling points of the shaft head with the ball head and/or of the socket insert with the hip socket.

Growing community of inventors

Esslingen-Zell, Germany

Thomas Pandorf