Patent ID: 7785278

Claim:
An apparatus comprising a: a. a shaft containing: i. a proximal surface opposite a distal surface, ii. at least one radial surface extending between the proximal surface and the distal surface, and iii. a longitudinal axis extending through the shaft from the proximal surface to the distal surface; b. a tip attached to the distal surface of the shaft containing: 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 wherein the plane of the opening is not orientated orthogonal 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; c. a channel or plurality of channels running through at least a portion of the shaft containing an opening within a surface of the shaft and opening within a wall of the cavity; and d. a coupling medium delivered to the cavity through at least one of the channels opening within a wall of the cavity.