MIT Technology Review reports on new advances in implantable device technology -- thin, flexible silicon electronics built on silk substrates, resulting in electronics that almost completely dissolve inside the body. Says the report, "These electronics don't need protection [from the body], and the silk means the electronics conform to biological tissue. The silk melts away over time and the thin silicon circuits left behind don't cause irritation because they are just nanometers thick." The research that has made this possible took place on several fronts, including the development of flexible, stretchable silicon circuits that perform as well as more traditional rigid circuits, and making such circuits bio-compatible.
Applications could include "silk-silicon LEDs that might act as photonic tattoos that can show blood-sugar readings, as well as arrays of conformable electrodes that might interface with the nervous system," according to the article. The same research group is currently designing electrodes built on silk as interfaces for the nervous system. Such electrodes could integrate much better with biological tissues than existing electrodes, which either pierce the tissue or sit on top of it. Electrodes built on silk could be wrapped around individual peripheral nerves to help control prostheses.
