A portable microprobe uses 10 gigahertz CW microwave radiation at a power level of less than 10 milliwatts for recording of a number of biophysical phenomena associated with the cardiac and neural activity of the life system. The microprobe consists of a Gunn diode feeding power into a short, insulated...http://www.google.com.au/patents/US4344440?utm_source=gb-gplus-sharePatent US4344440 - Microprobe for monitoring biophysical phenomena associated with cardiac and neural activity
