It's an interesting sensor, but the article didn't explain any technical details on how the thing is produced. Here's another article: http://www.doctorslounge.com/index.php/news/pb/22316

Technical Excerpt (for anyone interested): "The EES incorporates electrophysiological, temperature, and strain sensors, transistors, light-emitting diodes, photodetectors, radio frequency inductors, capacitors, oscillators, and rectifying diodes. Solar cells and wireless coils provided power supply."

Seems to be made on a silicon substrate (excerpt): "The investigators note that mechanical properties of the EES depend on the effective modulus and thickness of circuits, sensors, and the silicon-on-wafer substrate."