System takes form of a handheld device or wearable in patent designs 

It would send air down a barrel to make 'micro-particle' pierce skin 

The blood droplet would then be sucked in to the device to be analysed 

Smartwatches already collect data about your heart rate, how much exercise you do and your stress levels, but in the future they could take this a considerable step further.

Google has filed a patent for a 'needle-free blood draw' system that could be built into a wearable attached to someone's wrist, or a hand-held device.

The filing describes a machine that sends a pulse of gas into a barrel containing a 'micro-particle' capable of puncturing the skin and drawing a small drop of blood.