10 Electro-medical apparatuses, namely, computers and display devices, calibration devices and replacement parts therefor, for medical purposes, namely, for neurosurgical, cranial, orthopedic, spinal, soft tissue, ear, nose and throat (ENT), plastic surgery, radiosurgical and robot-assisted applications; surgical and medical navigation systems for use in locating and tracking the position of a patient and of instruments during image guided surgery, namely, high resolution computers, cameras, monitors, docking stations, headsets, probes, sensors, instrument adaptors, markers, target positioners and cables; Image guided surgery systems for image registration between pre-operatively acquired computer tomography (CT) data, MRI data, ultrasound data, positron emission tomography (PET) data, backscattered radiation data, and data captured intra-operatively from a light scanner, comprising surgical instruments, surgical robots, control boxes, instrument adapters, tool holders, endoscope adapters, microscope adapters, connection cables, and parts therefor; Image guidance systems for medical purposes, namely, for neurosurgical, cranial, orthopedic, spinal, soft tissue, ear, nose and throat (ENT), plastic surgery, radiosurgical and robot-assisted applications, namely, system carts, each comprising a computer, mouse, keyboard, foot pedal, monitors and universal power supplies, and system heads, each comprising light handles, light scanners, optical tracking systems and surgical luminaires; Image guided spinal, neurosurgical, cranial, orthopedic, spinal, soft tissue, ear, nose and throat (ENT), plastic surgery, and radiosurgical surgery systems comprising navigation tools, monitors, drills, saws, rasps, guide blocks, laparoscopes, trocars, reference clamps, reference frame, biopsy needles, pedicle finders, taps, screwdrivers, awls, universal handles, pedicle probes, sterilization trays, computers, computer mouses, keyboards, foot pedals, universal power supplies, light handles, light scanners, optical tracking systems and surgical luminaires pointers