Patent ID: 8029509

Claim:
A drill and a screw system for use in orthopedic surgery wherein the screw is cannulated and has a proximal torque driving head and a distal threaded portion, the screw head having an area defining a maximum screw diameter and having a convexly rounded distal area adjacent the area defining the maximum screw diameter, and the drill comprises a shaft, a handle and a drill head, where the drill head has a modified bulb shape extending along a longitudinal axis from the distal tip to a proximal portion and the drill head is narrowest at the distal most end and has a first area of a first diameter, wherein the drill head includes from 2 to 6 cutting flutes that each define a cutting edge about the longitudinal axis and the cutting flutes flaring from about the first diameter area to at least a second area having a second diameter, and the second diameter is greater than the first diameter, and wherein a third diameter of the drill head is the maximum diameter of the drill head and the cutting edges of the cutting flutes end at the third diameter of the drill head whereby the third diameter is slightly larger than or corresponds to the maximum screw diameter which is implanted using the drill of the system.