Autografting osteotome

摘要

A fluted osteotome is rotated in one direction to enlarge an osteotomy by burnishing, and by cutting/drilling when turned in an opposite direction. A conically tapered body has an apical end with lips. The lips are set to grind bone when rotated in the burnishing direction and cut bone when turned in the cutting/drilling direction. Helical flutes and interposed lands are disposed about the body. The flutes each have a working edge that burnishes bone when rotated in the burnishing direction and cuts bone when turned in the cutting/drilling direction. The lips and lands generate an opposing axial reaction force that improves surgical control. The osteotome auto-grafts bone by reapplying ground particles in a compacted manner along the entire depth of the osteotomy, particularly at the bottom.

主权项

1. A rotary osteotome (36) configured to be turned continuously at high speed in a non-cutting direction to enlarge an osteotomy (32), comprising:
a shank (40) establishing a longitudinal axis (A) of rotation for said rotary osteotome (36), a body (42) extending from said shank (40), said body (42) having an apical end (48) remote from said shank (40) and a conically tapered profile decreasing from a maximum diameter adjacent said shank (40) to a minimum diameter adjacent said apical end (48), a plurality of helically spiraling flutes (62) disposed about said body (42), a plurality of lands, each said land formed between adjacent flutes (62), each said land having a working edge (72) helically twisting about said body (42) in a direction that turns away from the non-cutting direction as said conically tapered profile decreases in diameter, said working edges (72) configured to radially displace surrounding bone material through compaction when said osteotome (36) is pushed into an osteotomy (32) while being rotated in the high-speed non-cutting direction, said apical end (48) of said body (42) including at least one grinding lip (50) extending radially from adjacent said longitudinal axis (A) to one of said working edges (72), a radially outer portion of said grinding lip (50) configured to grind bone material as said body (42) advances into the osteotomy (32) in the high-speed non-cutting direction, said grinding lip (50) having a generally planar first trailing flank (54), said first trailing flank (54) being canted from said grinding lip (50) at a first angle, a generally planar second trailing flank (56) falling away from said first trailing flank (54) at a second angle smaller than said first angle, a generally planar relief pocket (58) falling away from said second trailing flank (56) at a third angle smaller than said second angle, a plurality of said flutes (62) opening directly into said second trailing flank (56) to receive and then upwardly channel bone debris produced by said grinding lip (50) as said apical end (48) is pushed into the osteotomy (32) accompanied with high-speed rotation in the non-cutting direction, said working edges (72) further configured to auto-graft the bone debris particles channeled upwardly through said flutes (62) for repatriation into the surrounding bone material.