Patent ID: 7771459

Claim:
A medical fastener comprising: a head portion comprising a recessed inner surface having a first cylindrical portion that includes a plurality of indentations and plurality of extensions, each of said plurality of indentations and extensions extending across the first cylindrical portion, a second tapered portion having a first angle tapering substantially inward and away from the first cylindrical portion and toward a third portion that extends from the second tapered portion, the second tapered portion including a plurality of indentations and plurality of extensions, each of said plurality of indentations and extensions extending across the second tapered portion, the third portion having a generally cylindrical, substantially uniform cross-sectional profile, and a generally rounded base; the plurality of indentations and extensions disposed on the recessed inner surface cooperatively forming a driver contact surface area, said driver contact surface area extending across the first cylindrical portion and the second tapered portion to the third portion; and a threaded body portion having threads formed on at least a portion thereof, the threaded body portion extending from the head portion, wherein the threaded body portion comprises a first end located adjacent to the head portion such that the third portion of the recessed inner surface extends into the first end of the threaded body portion so as to extend to an interior of the threaded body portion, a second end located distal to the first end, and a channel extending from the second end toward the first end, the channel having an open end at the second end, the channel being positioned to collect particles from a hole receiving the threaded body portion, the channel traversing a plurality of the threads in the threaded body portion.