Manufacturer of medical surgical and therapeutic equipment. Products include XKnife(R) radiation therapy equipment, radiation surgery equipment, optical tracking equipment for image-guided surgery, microscope UIR equipment, OTS spine equipment and OTS software used in image-guided surgery. The software runs on a Windows platform. Also a manufacturer of stereotactic surgical equipment, including NeuroPlan(R), StereoCalc(R) and CRW(R), as well as RFG(R) and RFK(R) pain management equipment. Products are sold to the health care industry. The bulk of revenue is derived from activity in the medical industry. International sales but percent of sales unknown. Products include cardiac stimulators, radiation therapy instruments - XKnife(R), rF lesion generators - RFK(R), RF lesion generators - RFG(R), oTS spine equipment, Optical tracking equipment for image-guided surgery, Microscope UIR equipment, stereotactic surgical instruments - CRW(R), Radiation surgery equipment, collimators, stereotactic surgery software - StereoCalc(R), OTS software for image-guided surgery, Stereotactic surgery software - NeuroPlan(R).