DRILL BIT AND DRILL KIT FOR DRILLING A CAVITY OR A RECESS INTO A SKULL
A drill bit (2) for drilling a cavity (36) or a recess into a skull, wherein the cavity (36) or the recess is configured to receive an implantable fixture screw unit of a hearing aid system, is disclosed. The drill bit (2) includes a first part (4) including a drill tip (14) with a first drill diame...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A drill bit (2) for drilling a cavity (36) or a recess into a skull, wherein the cavity (36) or the recess is configured to receive an implantable fixture screw unit of a hearing aid system, is disclosed. The drill bit (2) includes a first part (4) including a drill tip (14) with a first drill diameter (di), wherein the drill tip (14) comprises a tip angle (α) of between 137 degrees to 143 degrees along a longitudinal axis (X) of the drill bit (2) and wherein the drill tip (14) comprises a back rake angle of between -1 degree and +1 degree, in particular a back rake angle of substantially 0 degrees, a second part (8) including a plurality of flute blades (22) with a second drill diameter (d2), wherein the second drill diameter (d2) is greater that the first drill diameter (di), and a transition part (6) which is arranged between the first part (4) and the second part (8) and along the longitudinal axis (X), wherein the transition part (6) includes a body clearance (20). |
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