Google has filed a US patent for a new smart product that could change the face of blood tests forever.

The technology giant has submitted a design for a new watch that would have the ability to check an individual's blood glucose levels without using a needle, but instead by sending a surge of gas into a small tube containing a microparticle. This microparticle would then puncture the skin to draw a tiny drop of blood, providing medical professionals with enough of a sample to test.

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