US 11,937,832 B2
Drill bit, drill kit and method for drilling a cavity or a recess into a skull
Hanna Peters, Askim (SE); Emelie Lager, Askim (SE); Anton Hedström, Askim (SE); Martin Johansson, Askim (SE); and Thomas Eriksson, Askim (SE)
Assigned to Oticon Medical A/S, Smørum (DK)
Filed by Oticon Medical A/S, Smørum (DK)
Filed on Jul. 7, 2021, as Appl. No. 17/369,312.
Claims priority of application No. 20184691 (EP), filed on Jul. 8, 2020.
Prior Publication US 2022/0008088 A1, Jan. 13, 2022
Int. Cl. A61B 17/16 (2006.01); A61B 17/17 (2006.01); A61B 17/56 (2006.01)
CPC A61B 17/1695 (2013.01) [A61B 17/1615 (2013.01); A61B 17/1739 (2013.01); A61B 2017/564 (2013.01)] 20 Claims
OG exemplary drawing
 
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.