Abstract: The invention relates to a method and device for referencing between a data set, which describes geometrically the spatial model of a body, and the real physical environment in which the body is placed. A three-dimensional position reference body is used on the real body. The position reference body has one or more elementary bodies or markers whose 3-dimensional position can be detected with sensors and which define a fixed geometric reference with respect to the center of gravity of the body or to other body reference volumes. For registration, the position reference body and/or its elementary bodies are correlated in the data model and in the physical world.

Abstract: The invention relates to a method and a device for instrument, bone segment, tissue and organ navigation. The general problem covered by the invention relates to referencing between a data set (that geometrically describes the spatial model of a body) and the real physical environment in which said body is located. For referencing, a three-dimensional position reference body is used or placed in the real body, said position reference body consisting of one or more elementary bodies (markers) that can be spatially and sensorially detected and defining a fixed geometric reference with respect to the center of gravity of the body or the other reference volumes of the body. A correlation of the position reference body or its elementary body is performed in the data model and in the physical world for registration.

Abstract: A system for bone segment navigation with a planning unit for planning a bone segment displacement, a marker arrangement to be connected to a bone segment, a position sensing unit which senses the position of the marker arrangement, and an indication and processing unit, which is connected to the position sensing unit and to the planning unit, in order to indicate the deviation of the present position of the bone segment from a planned final bone segment position or from a planned bone segment displacement path. The marker arrangement is connected in an unambiguously reproducible manner to the bone segment by a template allocated to the bone segment. After the template has been placed and fastened on the bone segment, a correlation is possible between the patient and the image data set or the planning data set, without probing and sensing individual bone points according to position by means of a pointer.