Patent ID: 8900260

Claim:
A surgical milling cutter, comprising a milling cutter bracket, a locking device and a bottom electric motor connected successively, the milling cutter bracket comprising a fixing seat ( 1 ) with a through hole, a finger guide apparatus ( 4 ) with an L-type first bracket at the top end thereof being provided on an upper part of the fixing seat ( 1 ), a distal end of a short side ( 8 ) of the L-type first bracket being provided with a downward projection ( 9 ), a lowest point of the projection ( 9 ) being lower than that of a cylindrical head ( 10 ) of the milling cutter when the milling cutter is working; a T-shaped bolt ( 3 ) having a through hole being fixed within a cavity of the finger guide apparatus ( 4 ), a first depressor ( 7 ) being provided on the upper part of the fixing seat ( 1 ), a nut ( 6 ) passing through a hole of the first depressor ( 7 ) and being connected to the bolt ( 3 ); the locking device comprising a protruding platform ( 2 - 1 ) with a through hole and a bearing ( 2 - 8 ) arranged on an inner wall of a small cylinder on the protruding platform ( 2 - 1 ), a locking sleeve ( 2 - 2 ) being fitted on the protruding platform ( 2 - 1 ), the locking sleeve ( 2 - 2 ) having a protrusion ( 2 - 5 ) arranged on an upper part of an inner wall of the locking sleeve ( 2 - 2 ) and a conical face ( 2 - 3 ) arranged on a lower part of the inner wall of the locking sleeve ( 2 - 2 ), a spring ( 2 - 9 ) being provided between a bottom of the conical face ( 2 - 3 ) and an upper bottom face ( 2 - 10 ) of the protruding platform ( 2 - 1 ), a second depressor ( 2 - 6 ) being threadedly connected to an outer wall ( 2 - 7 ) of a top part of the small cylinder on the protruding platform ( 2 - 1 ) and pressing the protrusion ( 2 - 5 ), a conical hole ( 2 - 11 ) being arranged on a wall of the small cylinder on the protruding platform ( 2 - 1 ) and communicating with the through hole of the protruding platform ( 2 - 1 ), a steel ball ( 2 - 4 ) being arranged in the conical hole ( 2 - 11 ).