Patent ID: 7229457
Filing Date: 2007-06-12
Classification: A61B,A61C

Abstract:
1. A surgical cutting tool comprising: a tubular housing having a bore and at least one slot formed through its wall; a cutting blade adapted to move relative to the slot and having an inner portion extending in each slot and an outer portion projecting from the slot; the outer portion of each blade having a continuous cutting edge; the inner edge of each blade having a plurality of spaced straight portions, a series of spaced stepped portions each extending between two straight portions, and a series of tapered surfaces respectively extending from the stepped portions; an actuator rod disposed in the bore and having a plurality of spaced straight portions and a plurality of spaced conical surfaces each extending between two straight portions; and the straight portions of the blade being aligned with the respective straight portions of the rod, and the tapered surfaces of the blade engaging the respective conical surfaces of the rod so that axial movement of the actuator rod in the bore causes radial movement of each blade relative to its respective slot to vary the size of the cut.