Method and apparatus for finding the position of a mechanical axis of a limb
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United States of America Patent
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Nov 3, 2009
Grant Date -
Apr 27, 2006
app pub date -
Aug 16, 2005
filing date -
Aug 31, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of finding the position of a mechanical axis running in the longitudinal direction through a limb that is rotatably supported by its first end in a center of rotation that is not fixed and is not accessible for the mechanical determination of coordinates, by means of an optical coordinate-measurement device with an indicator to detect measurement-point coordinates in one rotational position of the limb such that, for each rotational position, a multi-point indicator rigidly attached near the second end of the limb signals several measurement-point coordinates, and, from the sets of measurement-point coordinates detected in a plurality of rotational positions, at least one group is selected that can be assigned to the same site of the center of rotation, and the measurement-point-coordinate sets assigned to this site of the center of rotation are used to calculate the mechanical axis.
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