Hollow-point condensing-compaction tool

A rotary tool configured to be turned at high speed in both condensing and cutting rotary directions to accomplish different effects while forming a hole in bone, said rotary tool comprising:

• a shank establishing a longitudinal axis of rotation, said shank being an elongated cylindrical shaft having an upper end and a lower end, said shank configured to establish a longitudinal axis of rotation, a drill motor engaging interface formed at said upper end of said shank adapted for connection to a drill motor, an annular locking notch disposed in said shank between said upper and lower ends thereof,
• a body extending axially from said lower end of said shank, said body having an apical end remote from said shank, said body having a conically tapered exterior profile decreasing from a maximum diameter adjacent said shank to a minimum diameter adjacent said apical end, a plurality of flutes disposed about said body, each said flute having a cutting face on one side thereof defining a cutting rake angle and a densifying face on the other side thereof defining a densifying rake angle, said flutes each having an axial length and a radial depth, each said flute spiraling helically about said body, a stopper section of said body disposed between said flutes and said shank, a land formed between each adjacent pair of said flutes, each said land having a working edge along said cutting face of the one adjacent said flute, each said working edge being substantially margin-less, said working edge helically twisting about said body, said working edges each winding about said body in a direction that turns away from a non-cutting direction as said conically tapered profile decreases in diameter,
• a cavity disposed in said body, said cavity extending axially within said body and opening through said apical end, said cavity has a frusto-conical negative profile that is widest adjacent said apical end and narrowest adjacent said shank,
• a plurality of spurs disposed on said apical end of said body, said spurs disposed around said opening of said cavity, each said spur having a grinding edge forming a ridgeline between leading and trailing flanks thereof, the included angle between said leading and trailing flanks being between about 45-135 degrees, each said trailing flank being truncated by a steep face, a gullet formed between each said steep face and said leading flank of the next adjacent said spur, at least one of said spurs being a close-offset spur and at least one of said spurs being a far-offset spur, said grinding edge of said close-offset spur being a short offset from said longitudinal axis and said grinding edge of said far-offset spur being a large offset from said longitudinal axis, each of said short and long offsets being in the cutting direction of rotation, and
• at least one said flute opening directly into one said gullet, at least one said flute opening directly onto one leading flank adjacent an associated said grinding edge.