Abstract: The invention relates to a powered medical instrument having an adaptable deburring bit and independent nerve sensors that facilitate positioning of the instrument to a proximate surgery site. The medical instrument having a hand piece on a proximal end of a shaft and a hollow tip portion on a distal end of the shaft. The hand piece includes a handgrip and a squeezable trigger portion, whereby the trigger portion is independently compressible of the handgrip. The trigger portion controlling a rotatable surgical tool bit, which is housed in the tip portion and powered by a connecting drive system. The medical instrument further includes a safety apparatus provided on the grip portion, capable of locking the instrument and a monitoring system disposed on the tip portion, in order to identify proximity of nerve endings.