Patent ID: 8101933

Claim:
A medical device, comprising: a support frame installed such that a central axis thereof is positioned substantially horizontally; circular-tracks respectively disposed on both side faces of the support frame; a moving gantry configured to revolve concentrically with respect to the central axis of the support frame via sliding portions that are arranged at a predetermined interval along an entire circumference of each of the circular-tracks so that the sliding portions slide on the circular tracks; and revolving means for revolving the moving gantry, wherein the moving gantry is constructed of a rigid-framed structure formed of a first side portion and a second side portion disposed so as to flank the support frame from both side faces thereof, and coupling portions for coupling the first side portion and the second side portion, the rigid-frame structure includes a polygonal frame formed by joining a plurality of braces along a circumference of the support frame, the coupling portions are located on a radially inner side of the support frame, and the sliding portions are disposed at joints formed in an outer circumferential portion of the rigid-framed structure or in a neighborhood of the joints.