Patent ID: 8821493

Claim:
A medical drilling device comprising: a housing having a longitudinal axis, the housing comprising: a hand-held portion near a proximal end of the housing; a distal end of the housing; and an actuator; an axial drive shaft extending through a region of the housing between the proximal and distal ends and coaxial with the longitudinal axis of the housing; a first drive element coupled to a region of the axial drive shaft; a rotational drive shaft extending through a region of the housing between the proximal and distal ends and coaxial with the longitudinal axis of the housing; a second drive element coupled to a region of the rotational drive shaft; a coupler interchangeably connected to a working tool and the rotational drive shaft, wherein the coupler extends beyond the distal end of the housing and the working tool is coaxial with the longitudinal axis of the housing; and a drill guide assembly coupled to the housing and coaxial with the longitudinal axis of the housing, the drill guide assembly comprising a drill guide; a forward surface guide and a rear surface guide, wherein the drill guide surrounds the working tool and a distal region of the forward surface guide couples to the drill guide and a proximal region of the forward surface guide couples to the rear surface guide, and wherein the rear surface guide couples to the axial drive shaft, wherein the first drive element causes axial motion of the drill guide assembly towards the proximal end of the housing to a retracted state upon actuation of the axial drive shaft and drives a length of the working tool extending beyond the drill guide into a target region of a bone.