Patent ID: 7627090
Filing Date: 2009-12-01
Classification: A61N,G21K

Abstract:
1. A medical radiotherapeutic instrument comprising a ray source body, a switch and an end collimation body, wherein: a pre-collimation hole and a ray source cavity for placing a ray source are defined on the ray source body; the switch being at least two pillars, each pillar of said at least two pillars being coupled with a drive unit, the pillars being disposed inside the ray source body, a middle collimation hole being defined on each pillar of said at least two pillars, thereby the drive unit drives the pillars to move the middle collimation hole into or out of alignment with the pre-collimation hole; the end collimation body being disposed inside the ray source body, and an end collimation hole being defined on the end collimation body, the end collimation hole being connected with the pre-collimation hole through the middle collimation hole to form a therapy path.