The Dutch Institute for Applied Science has developed a system for measuring body motion, heart rate and respiration using RADAR technology (watch the video posted at Quantified Self). This means that vital signs can be measured automatically via completely non-invasive means. The development team believes they can bring the system to market within a year.
The implication for medical device design is that the time is almost here when we will be able to capture all kinds of physiological data automatically. Being able to to this in what amounts to a background activity will be a huge boost to the advancement of personal health monitoring. Look for devices to incorporate this type of technology to integrate sensing and analysis in a seamless manner.