An interactive system for guiding the use of a surgical tool uses at least one imaging technique, such as CT scanning. A mechanical arm has a fixed base at a first end and a tool holder that holds the surgical tool at a second end. A display displays one or more images from the image space of a patient's...http://www.google.co.uk/patents/US5142930?utm_source=gb-gplus-sharePatent US5142930 - Interactive image-guided surgical system
