Nanotech tattoo as health monitoring device

Context:

Researchers in South Korea have developed an electronic tattoo ink made of liquid metal and carbon nanotubes that functions as a bio-electrode.

About:

The device could be used to send readout of the wearer's vital signs if connected to biosensors, including for instance an electrocardiogram.
Alongside heart rates it could be used to read glucose or lactate levels for people with diabetes or sepsis.
The monitors could in theory be located anywhere, including in patients' homes.

About Bioelectrodes and Biosensors

Bioelectrodes are sensors used to transmit information into or out of the body and are mainly applied in cardiology and neurology applications.
Surface or transcutaneous electrodes used to monitor or measure electrical events in the body.
A biosensor uses biological molecules, tissues, organisms to measure chemical or biochemical concentrations. Biosensors can be used in many medical and non-medical applications.
Biomedical sensors detect simple physical parameters like blood pressure or temperature to blood glucose.
Biosensors works by changing the pH, ions, blood gases (O2, CO2 and etc.), drugs, hormones, proteins, viruses, bacteria, tumors and etc.

The Electronic Tattoo:

The electronic tattoo ink is made of liquid metal and carbon nanotubes that can deliver vital body information.
The ink is non-invasive and made from particles based on gallium, a soft, silvery metal also used in semiconductors or in thermometers.
Platinum-decorated carbon nanotubes help conduct electricity while providing durability.
When it is applied to the skin, even with rubbing the tattoo doesn’t come off, this is not possible with just liquid metal.