An improved expandable removal element for an atherectomy device wherein the expandable removal element is movable between an expanded position and a contracted position. In one embodiment of the present invention, a drive shaft is operatively connected to the distal end of the expandable removal element...http://www.google.co.uk/patents/US5501694?utm_source=gb-gplus-sharePatent US5501694 - Expandable intravascular occlusion material removal devices and methods of use
