Patent ID: 9681879
Date: 2017-06-20
CPC Classifications: A61B,Y10T

Claim:
1. A surgical drill, comprising: a cutting burr 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 cylindrical main body, the main body including a reduced diameter portion, opposing flattened portions defining bearing surfaces extending parallel to the central axis, and a conical shaped portion between the reduced diameter portion and the opposing flattened portions, the spindle further 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 a plurality of concentrically disposed sleeves; a detent pawl 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 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 spindle includes a first and second aperture extending through the spindle at a location adjacent the opposing flattened portions, the first and second apertures sized and b configured to allow the detent and locking pawls to extend into the spindle and engage the cutting burr.