Patent ID: 9381023
Filing Date: 2016-07-05
CPC Classification: A61B,Y10T

Claim Text:
1. A surgical drill, comprising: a cutting burr; a spindle rotatable about a central axis, the spindle defining a keyed slot adapted to receive a first six-sided portion of the cutting burr; a locking mechanism releasably mounted to the spindle and comprising a plurality of concentrically disposed sleeves concentric to the spindle, the plurality of sleeves including an outer sleeve, an inner sleeve, and an intermediate sleeve extending between the outer and inner sleeves; a detent pawl that contacts a second six-sided portion of the cutting burr such that the cutting burr is movable in an axial direction along the second six-sided portion while retaining the cutting burr within the surgical drill when the locking mechanism is in a loading position; a locking pawl pivotally attached to the spindle and having 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, wherein the inner sleeve includes a tapered end and the spindle includes a complimentary beveled outer portion that engages the tapered end to brake the spindle when the locking mechanism is in the loading position, the tapered end also engaging the locking pawl to prevent the locking pawl from engaging the cutting burr when the locking mechanism is in the loading position.