Patent ID: 8162964

Claim:
A directional rotational atherectomy device for directional biasing ablation of occluding material in a blood vessel having a given diameter, comprising: a rotatable catheter tube having an outer diameter less than the diameter of the blood vessel and a lumen therethrough and further comprising a distal end, the distal end comprising a longitudinal split, and a longitudinal axis; an ablating element formed from the longitudinal split of the distal end of the catheter tube, comprising at least one biasing element, and at least one cutting element, the ablating element comprising an undeformed expanded position and a deformed retracted position, wherein the deformed retracted position comprises the at least one cutting element having a position that is substantially collinear with the catheter tube longitudinal axis and the at least one biasing element deformable to a position substantially collinear with the catheter tube longitudinal axis and adjacent with the at least one cutting element, and wherein the undeformed expanded position comprises the at least one cutting element having a position that is substantially collinear with the catheter tube longitudinal axis and the at least one biasing element undeformed and radially expanded away from the at least one cutting element.