An atherectomy catheter including an expandable cutter head having spaced apart blades radially extending from a cutter sleeve at a leading end of the cutter head. A torque tube is attached to and surrounds the blades at an expanding end of the cutter head opposite the leading end. An expander cable...http://www.google.co.uk/patents/US5154724?utm_source=gb-gplus-sharePatent US5154724 - Atherectomy catheter
