Patent ID: 11937832
Assignee: OTICON MEDICAL A/S
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A drill bit for drilling a cavity or a recess into a skull, wherein the cavity or the recess is configured to receive an implantable fixture screw unit of a hearing aid system, the drill bit comprising:
a first part including a drill tip with a first drill diameter, wherein the drill tip comprises a tip angle of between 137 degrees to 143 degrees along a longitudinal axis of the drill bit and wherein the drill tip comprises a back rake angle of between −1 degree and +1 degree,
a second part including a plurality of flute blades with a second drill diameter, wherein the second drill diameter is greater that the first drill diameter, and
a transition part which is arranged between the first part and the second part and along the longitudinal axis, wherein the transition part includes a body clearance.