I have seen surgical support devices based on the Microsoft Kinect game interface. Surgeons can control machines in an operating theatre without touching them by making defined gestures. The relatively cheap, but powerful, gaming interface replaces much more expensive but limited, purpose-built surgical interfaces.
Kinect uses video motion sensing to understand a user’s body position and gestures, with facial and voice recognition. Another approach was recently announced by Thalmic Labs: the MYO. An armband combines motion sensing with a measurement of the activity of individual muscles. Thalmic liken it to Jedi gestures. Here’s a video showing it in action: