| 主权项 |
1. An MRI compatible hand-held, manually operable surgical drill, comprising:
a housing; a ring gear held in the housing; a hand crank attached to the ring gear, wherein the hand crank has an elongate lever that merges into a base, wherein the base of the hand crank has an internal portion that is surrounded by the ring gear, and wherein the lever resides outside the housing while the internal portion of the base is held in the housing; a pinion gear held in the housing in cooperating alignment with the ring gear; a chuck extending from the housing; and jaws attached to a chuck support and residing in the chuck adapted to hold a drill bit so that the drill bit extends out from the chuck, wherein the drill is sterile for surgical use and light-weight, wherein the housing comprises first and second housing members that attach together to enclose the ring and pinion gear and the internal portion of the base of the hand crank, wherein each of the first and second housing members have an exterior wall with a circular portion having a circular outer perimeter extending about a centerline that is in line with an axis of rotation of the ring gear, wherein the axis of rotation is perpendicular to a longitudinally extending centerline of the chuck, wherein the circular portion of the first housing member holds the ring gear and the internal portion of the base of the hand crank, wherein the ring gear surrounds a cylindrical internal wall of the internal portion of the base of the hand crank that extends about an inwardly facing cylindrical cavity, wherein the circular portion of the second housing member comprises an internal, inwardly projecting member that extends a distance into the cylindrical cavity, and wherein the ring gear, the hand crank lever and the hand crank base are a unitary single polymeric molded member. |
