BioMedical Nanorobots are Biomedical electronics systems implanted in human body, examples are heart pacemakers, kidney supporting systems, Brain implants, wireless health monitoring systems, etc. Taiwan scientists developed a latest nanodevice that sits underneath the skin and converts near-infrared (NIR) light energy into electrical power. This is a promising wireless electrical power source for biomedical nanorobots for use within the human body.

Biomedical Nanorobots Powered by Near-Infrared Light Energy Harvesting

Biomedical Nanorobots Powered by Near-Infrared Light. Image Credits: RSC

The nanodevice is an organic photovoltaic device (OPV) designed by Fang-Chung Chen and his team from National Chiao Tung University. OPVs are more commonly known for their applications in solar cell technology converting sunlight into electricity. Chen has developed an OPV device that uses near-infrared light, enabling the energy conversion to occur underneath the skins surface as biological tissues are highly transparent to near-infrared light. It is made up of several layers including indium tin oxide (ITO)-coated glass, anodic buffer, polymer/fullerene-mixed layer and calcium/aluminium cathode. The device is small, the shape of a fibre, and is ideal for a biological environment.

To test their theory, Chen’s team covered the OPV device with a 3mm layer of porcine skin and fired a NIR laser on it at the maximum threshold tolerated by human skin. The team measured the OPV electrical output as 0.32µW, which is more than enough to drive many biomedical nanodevices at the same time – the typical power needed for one nanodevice is approximately 10nW.

In addition to tissue repair or medical target identification, this organic photovoltaic device could act as an energy source to trigger biomedical functions of the nanorobots, or more straightforward applications in neurostimulation, says Chen.