Patent ID: 8801713

Claim:
A surgical drill, comprising: a cutting bur including a shank defining a first six-sided portion and a second six-sided portion; a spindle rotatable about a central axis, the spindle defining a keyed slot adapted to receive the first six-sided portion of the cutting burr; a locking mechanism releasably mounted to the spindle and comprising plural concentrically disposed sleeves; a detent pawl pivotally attached to the spindle that contacts the second six-sided portion of the cutting burr at a predetermined force such that the cutting burr is movable in an axial direction along the second six-sided portion when the locking mechanism is in a loading position; a locking pawl pivotally attached to the spindle and having a distal end received on a portion of the surface at a distal end of the spindle when the locking mechanism is in the loading position and an engagement end adapted to engage adjacent surfaces of the second six-sided portion of the cutting burr received within the locking mechanism when the locking mechanism is in a running position; and a motor for driving the spindle and the locking mechanism.