Patent ID: 8192451

Claim:
An atherectomy device for grinding and/or cutting and coring occluding material within a lumen having at least one diameter, comprising: a flexible elongated, rotatable shaft having an outer diameter less than the lumen and advanceable therethrough, the flexible shaft comprising a proximal end and a distal end, a cutting element attached proximate the distal end and capable of a retracted position having an outer diameter and a plurality of radially outwardly biased cone-shaped expanded positions having a plurality of outer diameters, each outer diameter matching the lumen's at least one diameter, the cutting element comprising a longitudinal axis, more than one coil section in expandable and retractable operative attachment, a large proximal diameter portion having an outer edge and a small distal diameter portion, cutting blades on the large proximal diameter portion, wherein the cutting blades face proximally and wherein the small distal diameter portion is located distal to the large proximal diameter portion and the cutting blades, and at least one aperture through the more than one coil section, wherein the retracted cutting element comprises an outer diameter, and a sheath slidably and operatively connected with the flexible shaft, the shaft having a lumen therethough, the shaft lumen having an inner diameter that is larger than the outer diameter of the retracted cutting element, the retracted cutting element held within the shaft lumen.