Mastoid bone start drill bit
AssigneeCochlear Limited
InventorsGöran BJÖRN, Jerry FRIMANSON
Life of this patent
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Abstract
A drill bit for drilling into bone, including at least a first, second and third longitudinally extending substantially straight flute blades, wherein the drill bit has an extrapolated outer profile established by rotation of the first, second and third flute blades 360 degrees about a longitudinal axis thereof, the extrapolated outer profile includes a first surface having tangents more perpendicular than parallel to the longitudinal axis, and the extrapolated outer profile includes a second surface having tangents more parallel than perpendicular to the longitudinal axis.
Claims20
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.
A drill bit for drilling into bone, comprising:
- at least a first, second and third longitudinally extending substantially straight flute blades, wherein:
- the drill bit has an extrapolated outer profile established by rotation of the first, second and third flute blades 360 degrees about a longitudinal axis thereof,
- the extrapolated outer profile includes a first surface having tangents more perpendicular than parallel to the longitudinal axis, and
- the extrapolated outer profile includes a second surface having tangents more parallel than perpendicular to the longitudinal axis.
Dependencies are inferred from the claim text.