HADRON THERAPY INSTALLATION WITH MOVING FLOOR

摘要

The invention relates to a hadron therapy installation (1) that comprises a moving floor (8′, 8″) in the form of a deformable band guided in a guide structure (10). A lower segment (8′) can be pulled by the irradiation unit (5) from a lower docked position to a position in which it forms a substantially horizontal floor surface, when the irradiation unit (5) is in a first angular position (a). An upper segment (8″) can be pulled by the irradiation unit (5) from an upper docked position to a position in which it at least partially forms said substantially horizontal floor surface, when the irradiation unit (5) is in a second angular position (β). The lower segment (8′) and the upper segment (8″) are segments with a finite length. A counterweight (19) is connected to the free end of the upper segment (8″), so as to exert a traction force on the latter toward the upper docked position.

主权项

1. A hadron therapy installation (1) comprising:
an irradiation unit (5) with a horizontal axis of rotation capable of rotating around a treatment area between a first angular position (α), situated above said treatment area, and a second angular position (β), situated below said treatment area; a moving floor (8′, 8″) in the form of a band deformable in the longitudinal direction, comprising a lower segment (8′) and an upper segment (8″) situated on either side of said irradiation unit (5); a guide structure guiding said moving floor (8′, 8″) along a path around said treatment area such that it forms a substantially horizontal floor surface below said treatment area and a wall surrounding said treatment area as far as said first angular position (α) above said floor surface; said lower segment (8′) being able to be pulled by said irradiation unit (5) from a lower docked position, in which it is found when said irradiation unit (5) is in said second angular position (β), to a final operational position, in which it is found when said irradiation unit (5) is in said first angular position (α), and in which it forms said substantially horizontal floor surface; and said upper segment (8″) being able to be pulled by said irradiation unit (5) from an upper docked position, in which it is found when said irradiation unit (5) is in said first angular position (α), to a final operational position, in which it is found when said irradiation unit (5) is in its second angular position (β), and in which it at least partially forms said substantially horizontal floor surface; characterized in that said lower segment (8′) and said upper segment (8″) are segments with a finite length, each comprising a free end; and in that a traction device (17, 19) is connected to said free end of said upper segment (8″), so as to exert a traction force on said upper segment toward said upper docked position sufficient to keep said upper segment under axial tension independent from the angular position and direction of movement of said irradiation unit.