Abstract: The invention relates to an implant for partially replacing surfaces that are subject to stresses, especially the surfaces of a joint. Said implant comprises a spherical or axial, preferably cylindrical base to be inserted in an area removed from the bone, e.g. a punched or drilled area. The base comprises at least one surface for replacing the section to be replaced and/or an adapter for receiving an element carrying the section, e.g. a joint surface element, tooth or pivot tooth.

Abstract: An implant for partially replacing surfaces that are subject to stresses includes a base that is inserted into an area removed from a bone. The base includes at least one surface for replacing the removed area of the bone and an adapter for receiving the base. The system for inserting the implant includes an angle determining system that includes a set of elliptical plates having different diameters to determine the cutting angle of the implant to be utilized to replace the surface of the bone. The system also includes an oscillating drill with hollow drills that have beveled tips.

Abstract: Implants and methods for producing same are described, the implants featuring an adjustable porous shell, the inside being continuously interconnectingly adjustably porous and which can be sintered net shaped; these implants exhibit a high compression stability and show, when being combined with filler materials with or without active agents, different chemical, physical-mechanical, biomechanical or also pharmacological properties. The essential features of the manufacturing process are described in FIG. (1) and comprise expandable shaping elements, deformable elastic tools, the application of defined negative pressures, temperatures during defined application periods in combination with combined materials, which can be separated from each other physically, chemically or mechanically and removed.

Abstract: Implants and methods for producing same are described, the implants featuring an adjustable porous shell, the inside being continuously interconnectingly adjustably porous and which can be sintered net shaped; these implants exhibit a high compression stability and show, when being combined with filler materials with or without active agents, different chemical, physical-mechanical, biomechanical or also pharmacological properties. The essential features of the manufacturing process are described in FIG. (1) and comprise expandable shaping elements, deformable elastic tools, the application of defined negative pressures, temperatures during defined application periods in combination with combined materials, which can be separated from each other physically, chemically or mechanically and removed.

Abstract: The invention relates to an implant (100) for partially replacing surfaces that are subject to stresses, especially the surfaces of a joint. Said implant comprises a spherical or axial, preferably cylindrical base (116) to be inserted in an area removed from the bone, e.g. a punched or drilled area. The base comprises at least one surface (104) for replacing the section (112) to be replaced and/or an adapter for receiving an element carrying the section, e.g. a joint surface element, tooth or pivot tooth.

Abstract: A modular prosthesis for replacement of hip joints has a shaft that fits into the femur canal to replace a previous prosthesis, which is made up of sections aligned and held on a cylinder that extends through the sections. In this matter, the length of the shaft can be changed to insure that the shaft will be aligned with bone sections that have not been damaged from the previous prosthesis. The shaft includes a shoulder segment adjacent the proximal end of the femur to attach to ball or head prosthesis using tension carrying screws or elements.

Abstract: The present invention essentially relates to a hip joint endoprosthesis stem for cement-free or cemented anchoring in bones that is anchored in the femural neck and in the proximal metaphysis and preserves the internal spongiosa and compact structures that reinforce the femur, that gives the design element axial access to the medullary canal, and possesses parabolically curved outer surfaces to optimize the transfer of force to the bone.

Abstract: A hip prosthesis constructed to transfer forces to the femur without relative movements that cause failures. The prosthesis stem has an open sided central bore. The proximal end of the prosthesis is configured to seat against interior surfaces of the femoral canal and support a femur head on a prosthesis shoulder that seats on the stem proximal end while maintaining the neck of the femur intact.

Abstract: The present invention essentially relates to a hip joint socket system for a “press-fit” anchorage in the bony acetabulum that allows the inserts that articulate with the artificial head to be connected securely, and, using said inserts, also allows the center of the rotation of the socket to be reconstructed, the risk of luxation to be eliminated, and the plane of load application to be varied across an infinite range of positions within a defined angular range.

Abstract: The present invention essentially relates to a hip joint endoprosthesis stem for cement-free or cemented anchoring in bones that is anchored in the femural neck and in the proximal metaphysis and preserves the internal spongiosa and compact structures that reinforce the femur, that gives the design element axial access to the medullary canal, and possesses parabolically curved outer surfaces to optimize the transfer of force to the bone.

Abstract: The invention relates to a uncemented prosthesis having a tension anchor embodied as a thrust rod that is solely anchored internally in the femural neck by means of a conically axial tension anchor in the dorsolateral corticalis. The femural neck is completely preserved in this prosthesis.

Abstract: The present invention essentially relates to a hip joint socket system for a “press-fit” anchorage in the bony acetabulum that allows the inserts that articulate with the artificial head to be connected securely, and, using said inserts, also allows the center of the rotation of the socket to be reconstructed, the risk of luxation to be eliminated, and the plane of load application to be varied across an infinite range of positions within a defined angular range.

Abstract: The invention relates to a shaft prosthesis having a modular system that is anchored in the proximal cement cavity by means of a conically axial tension anchor. The stem segments and base segments may be of various lengths.

Abstract: A material is disclosed which produced by a process in which a mold is filled of deformable shaped bodies, after which the mold is filled with a base material. The bodies are removed and the solidified base material forms a material of shell-like structures and an interconnecting pore system between the skeleton structures. The material produced by the process can be used as bone replacement materials, implants, filters and drug delivery systems.

Abstract: A hip-joint endoprosthesis is provided which has a prosthesis head (5) that can be medio-laterally displaced parallel to a tangent that rests on the lateral edge of the proximal femoral infundibulum of the hip-joint (b) and contacts the inner contour of the curved neck of the femur (b'). This hip-joint endoprosthesis allows the centre of rotation of the hip-joint to be reproducibly adjusted by means of an adjustable head (5). Toothings (12, 13, 15, 16) ensure a (fine) stepped adjustability of the displacement in the medio-lateral direction (B--B') and of the rotation around an axis (A--A) that is perpendicular to the plane of displacement (B--B'). Securing is allowed by a single screw (10) that braces the engaged toothings (12, 13, 15, 16) against each other. The height of the joint ball (6) mounted on the prosthesis head (5) via a cone (17) can be adjusted by joint balls (6) having pressed-in cones of varying depths.

Abstract: A multiple component material, in particular a filler particle containing implantation material is produced and used to anchor prothesis components in bones, to strengthen bones, as dowel for bone screws and as implants for anchoring screws. The polymer component of the disclosed implantation material is preferably based on an acrylate or polymethacrylate basis, or on an acrylate and methacrylate copolymer or a mixture thereof. The polymer component encloses the filler particles at least in part. Preferably, the filler particles are 5 to 15 .mu.m in size and have at least 50% void volume. The multiple component material is stored in a dry, stable particulate form ready for use by mixing with monomer liquid.

Abstract: The invention relates to a material of a three-dimensional framework of supporting, trabecular structures encompassing cavities which are connected with one another and which can be predeterminedly adjusted. The material is obtainable by forming the framework around the shaped bodies serving as space retainers for the cavities and subsequently removing the shaped bodies. The material according to the invention can be used for example as a implant or as a filter.

Abstract: A process is disclosed for producing a positive-material with a skeleton made of shell-like structures and an interconnecting pore system designed between the skeleton structures. Also disclosed is a process for producing a negative-material made of shaped bodies interconnected by bridges a process for producing a positive/negative-material, materials produced by this process and their use as bone replacement materials, implants, filters and drug delivery systems. According to this process deformable shaped bodies in bulk are poured into a mold that forms a negative model of the material.

Abstract: The invention relates to a femur stem (10) of a hip joint endoprosthesis. The cross-section of the femur stem twists from its proximal to its distal region in such a way that the transverse-oval cross-section in the proximal region turns towards the distal direction such that the cross-section is sagittal-oval in the distal region. The femur stem according to the invention can easily be introduced into the medullary canal and is optimally adapted to the shape of the medullary canal.

Abstract: An apparatus and a method of vacuum mixing mixes substances consisting of at least one powder component and at least one liquid component, in particular of bone cement. An evacuatable mixing vessel (1) has a body (4), which is movable within the mixing vessel. The outer circumference of the body (4) and the inner wall of the mixing vessel (1) form an air-tight seal. The inside of the body (4) is provided with an opening which is covered with a filter (9). The filter (9) is designed such that it can be penetrated by air but not by the powder component of the mixture of substances. With the apparatus according to the invention it is possible to produce a mixture of substances which is free of bubbles.