Patent ID: 8562547

Claim:
An apparatus comprising: a. a shaft comprising: i. a proximal end opposite a distal end, ii. at least one radial surface extending between the proximal end and the distal end, and iii. a longitudinal axis extending through the shaft from the proximal end to the distal end; b. a tip arranged at the distal end of the shaft and comprising: i. at least one radial surface; ii. a paraboloid cavity containing at least one wall and an opening within at least one of the radial surfaces of the tip, the opening having a peripheral edge lying in a plane, the plane of the opening being oriented generally parallel to the longitudinal axis of the shaft; and iii. a sharpened cutting member or plurality of sharpened cutting members at the opening of the cavity; and c. a channel or plurality of channels running through at least a portion of the shaft and comprising an opening within a wall of the cavity, wherein: the channel or plurality channels is adapted to receive a coupling medium for delivery to the cavity via the opening within the wall of the cavity; and the shaft and the tip are a single piece.