A hand-held, line-powered device (which may in addition include a rechargeable battery) that consists of a motorized saw handpiece intended to provide sagittal, oscillating, or reciprocating movement for attachable serrated blades designed to cut through hard/tough tissue during surgery. The device may be of the micro or macro design. It is powered from a control unit that supplies mains, stepped-down, low-voltage electricity (e.g., 24 volt) directly via an electrical connecting cable. It is typically operated with a hand- or foot-switch. This is a reusable device.