Ceramtec Ag, Innovative Ceramic Engineering

Cerasiv Gmbh Innovatives Keramik-Engineering

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Cera Gmbh, Innovatives-Keramik-Engineering

Cerasiv, Gmbh Innovative Keramik Engineers

Hans-Georg Pfaff

Hartmut K&auml;lberer

Wilfried Von Chamier

Robert Rack

Gerd Willmann

Dirk Badorf

Hartmut Kalberer

Paul Silberer

Dirk Rogowski

Ernst Hoch

Ralph Autenrieth

Martin Wimmer

Herbert Richter

Dirk B&auml;dorf

Alwin Nagel

Werner Deppisch

Kartmut Kalberer

Christian Worne

Hartmut K Alberer

Harmut Kalberer

Porous coatings on high-performance ceramics attempt to combine the mechanical and thermal characteristics, which fulfil stringent demands, of the substrate material with the advantageous properties of coating materials. The subsequent application of layers of this type to the pre-sintered substrate produces unsatisfactory results in several areas of use with regard to possible layer thickness, porosity and adhesion. According to the invention, a shaped body consisting of a sintered, inorganic material, whose surface comprises a porous layer is produced in such a way that the base body is first formed as a green body. A layer in the form of a suspension, also containing an inorganic material, is then applied to the surface or to one section of the surface of the base body. A predetermined fraction of a pore-forming substance is mixed with at least the material of said layer and the green body with its applied layer is subjected to the thermal treatments required for producing a monolithic sintered body.

Sintered shaped body, whose surface comprises a porous layer and a method for the production thereof

Joint prostheses, in which one joint partner is formed as a socket and the other joint partner is formed as a spherical head which is rotatably mounted in the socket, are known in particular as shoulder-joint and hip-joint prostheses. The force-fit connection, in particular conical jamming, is also used here as the connecting technique between metallic or ceramic spherical heads and the cone. A coupling element ( ) is inserted between the cone ( ) and the spherical head ( ) of the force-fit connection ( ). The elasticity and damping properties of the coupling element ( ) can be predetermined by its porosity and the structure of its surface.

Press fit connection between prosthetic components of joint prostheses

An instrument for manipulating, detachably holding and placing an insert portion of a joint socket prosthesis into an outer shell of a said prosthesis. The instrument includes a handle and a holding tool. The holding tool includes two or more grasping claws which extend radially from the longitudinal axis of the handle over the insert, and serve to engage the insert to the holding tool. The handle is elongated and slideably positioned within a longitudinal bore or hole in the holding tool and typically includes a plunger. The insert is released when an operator causes the handle to slide within the holding tool towards the insert with sufficient force to disengage the insert from the grasping claws.

Instrument for manipulating components of joint prostheses

Prostheses with artificial joints have only a few metallic and ceramic materials whose compatibility with human or animal tissue has been established. These materials, however, cannot be combined with one another in any manner if a friction pairing occurs as a result, for example, in the case of artificial joints. With artificial joints, joint partners are required to have good mechanical properties as well as tribological properties. According to the invention, a sintered material is thus provided which is comprised of zircon oxide with an addition of 0.1 to 40 wt. % aluminum oxide. This sintered material enables an artificial joint of a prosthesis whose other ceramic materials are comprised of aluminum oxide or zircon oxide with the given proportions of aluminum oxide to be assembled with joint partners.

Artificial joint of a prosthesis

A hip-joint socket of a hip-joint endoprosthesis is provided, in which the bearing shell of the socket that mounts the ball head of the shaft is made of a ceramic material. The bearing shell (,) of the hip-joint socket (,), in the region of its surface (,) with which it is inserted into the hip bone, is covered with a coating (,) that is made of a biocompatible metal or a biocompatible metal alloy.

Ceramic acetabular cup with metal coating

Hip joint prosthesis

Fixation of a ceramic structural member by way of gliding in a femoral part

A ceramic socket or ceramic socket insert for a hip joint prosthesis is tested prior to implantation in a human body by subjecting the portions of the interior of the socket or socket insert to a load that generates stresses that are greater than the physiological load. This may be accomplished either by pressing a hemispherically-shaped deformable material such as polymer or plastic into the interior of the socket or socket insert or by exposing the interior of the socket or socket insert to a fluid under pressure. The interior of the socket or socket insert may be sealed off with a test punch that has a supply line for the fluid. To reduce the amount of fluid that is required, the test punch may have a bulge that projects into the interior of the socket or socket insert and leaves only a gap for the fluid. In the method of testing, the interior of the socket or socket insert is subjected to a load that generates stress such that a defective socket or socket insert is destroyed and a non-defective socket or socket insert survives unharmed.

Method of testing ceramic cotyloid cavities for hip joint endoprostheses

The invention relates to a knee-joint endoprosthesis with a femoral part anchored in the femur and a tibial plate connected to the tibia bone, on which tibial plate tibial parts are arranged by way of gliding surfaces, and preferably with meniscus elements disposed between the femoral part and the tibial parts. With a view to mechanically stable anchorage of the tibial part on the tibial plate that may optionally be subsequently released, even at the implanted joint, so that the tibial part can be exchanged, it is proposed that the tibial part or parts are detachably connected to the tibial plate by wedging, screwing and/or bracing.

Fixation of a tibial part on a tibial plate of a knee-joint

Joint prosthesis (1) with a cup-shaped supporting part (2) in whose interior a ceramic insert (3) is fastened by conical clamping. Clamping surface (6) of insert (3) runs at an angle (.alpha.) to clamping surface (7) of supporting part (2).

Joint prosthesis

Disclosed is a hip joint socket for insertion into bone tissue, having an outer metal shell and an inner antifriction liner. The antifriction liner is fixed in the metal shell by means of a taper lock. To safeguard the socket insert and antifriction liner against misalignment and separation, and enable a non-destructive removal of the liner and replacement thereof, the angle (.alpha.) of the taper lock of the liner in the shell is between 10.degree. and 25.degree..

Tapered hip joint socket

Disclosed is a hip-joint socket for insertion into bone tissue. The hip-joint socket has an outer metal shell and an inner antifriction shell, the contact surface of the antifriction shell in the metal shell being conical in shape. The antifriction liner lies upon the conical contact surface without self-locking and the antifriction liner is fixed in the metal shell by a retaining ring. The antifriction shell is thus protected against canting and drop-out but can be removed out of its seat nondestructively and replaced.

Tapered hip-joint socket without taper lock

The invention relates to a hip joint socket for insertion into bone tissue, with an outer metal shell and an inner ceramic shell, the ceramic shell being anchored in the metal shell. To reduce its size while simultaneously reducing the wall thickness of the ceramic shell the inside of the metal shell and the outside of the ceramic shell have a spherical shape accurately fitted to one another and means are disposed for equalizing the transmission of force between the ceramic shell and the metal shell.

Growing community of inventors

Ostfildern, Germany

Hans-Georg Pfaff