| 摘要 |
<p>A three-dimensional rotation mechanism comprises three rotateable elements (50,56,60) fixed together in series, the first and second being fixed together with their rotational axes non-parallel, and the second and third being fixed together with their rotational axes non-parallel. Since the rotation axes of the rotateable elements are not parallel, as one or more elements are rotated, the wedge elements (54,58) that lie between them can be brought into and out of alignment. The rotateable elements are generally disc-shaped, such as in the form of torque motors. There is preferably a control apparatus for controlling the first, second and third rotateable elements to each rotate by a specific angle of rotation. A patient support is also described, comprising a table supported via a three-dimensional rotation mechanism as described above.</p> |
