Patent ID: 7340291

Claim:
A medical apparatus comprising: a data processor in which an image dataset of a body region of a subject is stored, said subject containing a bone fragment and said bone fragment being represented in said image dataset; a display connected to said data processor that displays an image of the body region, obtained from said image dataset, said image containing a visualization of said bone fragment; an image computer connected to said data processor that executes a segmentation procedure to produce a segmented visualization of said bone fragment in said image allowing said segmented visualization of said bone fragment to be repositioned in said image of said body region on said display of the body region; a medical instrument configured for introduction into the body of the subject and configured to interact with said bone fragment in the body of the subject to move said bone fragment; a navigation system that determines a position of the medical instrument relative to the body of the subject while said bone fragment is being moved with said medical instrument, and that generates medical instrument position data representing said position; and said data processor being connected to said navigation system and being supplied with said medical instrument position data and determining, solely from said medical instrument position data, a modified position of the bone fragment relative to the body of the subject, and causing said segmented visualization of said bone fragment to be repositioned in said image of said body region on said display in conformity with said modified position as said bone fragment is moved by said medical instrument.