Question: i think that this is all very interesting but, Tatiana. how will you make the device so small that you can still get a signal to transport it through the blood stream?

Tatiana Trantidou answered on 19 Jun 2015:

Thanks for finding my work interesting 🙂
The devices are indeed very small, but they are not inserted in the body themselves. I use them outside the body to make tiny droplets that contain drugs inside. These droplets are then inserted in the body (not the devices).
A very good way to detect the signal once the droplets are inside the body is to use a drug that is able to glow when it reacts with a specific substance. Imagine that the drug inside the droplet is initially dark (switched off). The droplet travels through the body and still remains inactive, as long as it does not find itself close to the specific substance (let’s say a specific protein that is produced by a cancer cell). When the droplet finds a cancer cell, the protein reacts with the drug and activates it (the droplet glows). We can detect this glow (called fluorescence) using powerful machines. So, if we see a glow we know that the drug found a cancer cell and reacted with it, if we don’t see any, we know that it didn’t.