The idea of implantable sensors that continuously transmit information on vital values and concentrations of substances or drugs in the body has fascinated physicians and scientists for a long time. Such sensors enable the constant monitoring of disease progression and therapeutic success. However, until now, implantable sensors have not been suitable to remain in the body permanently and require replacement after a few days or weeks.
source https://phys.org/news/2021-04-tattoo-gold-nanoparticles-revolutionizes-medical.html
