Rotary oscillating bone, cartilage, and disk removal tool assembly

A bone, cartilage, and disk removal tool assembly comprising:

• a housing;
• a power driven motor mounted in the housing, said motor including an output shaft having a fixed axis of rotation with respect to said housing, said motor output shaft directly connected to an offset member to rotate therewith, said offset member rotating around an axis of rotation of said output shaft, a counter balance directly connected to said offset member and offset from said axis of rotation in an opposite direction with respect to said offset member, said offset member mechanically engaging a rack portion of a rack and pinion mechanism, said rack portion including a channel having opposing sidewalls spaced apart to receive said offset member therebetween so that said offset member engages said opposing sidewalls during rotation thereof to cause said rack portion to be moved back and forth across said axis of rotation of said motor output shaft during rotation thereof;
• a spindle mounted for rotation to the housing, a pinion of said rack-and-pinion mechanism secured to a first end of said spindle for rotation therewith and in direct engagement with said rack portion of said rack-and-pinion, a cutting tool secured to a second end of said spindle;
• whereby said rack-and-pinion mechanism is operably driven by the motor to oscillate the spindle in response to traversal of said rack for providing a rotary oscillating cutting motion to said cutting tool for removing bone, cartilage and disc material while said output shaft of said motor provides selectable continuous rotary motion in a single direction to said rack-and-pinion mechanism.