Patent ID: 9610085
Date: 2017-04-04
CPC Classifications: A61B,B23B,H04R

Claim:
1. A drill bit for drilling into bone, comprising: first and second longitudinally extending substantially straight flute blades; third and fourth longitudinally extending substantially straight flute blades, wherein the first and second flute blades extend further in the distal direction of the drill bit than the third and fourth longitudinally extending flute blades, wherein each of the first, second third and fourth flute blades include a leading surface and at least one first trailing surface extending away from the leading surface at an angle of at least about 280 degrees, and the drill bit further includes a stop surface, and a relief between the flute blades and the stop surface immediately adjacent the stop surface, wherein a cutting edge of the first flute blade extends smoothly from a tip of the drill bit to the relief.