Speculation that Google’s next piece of wearable technology will be a blood-sucking smartwatch that helps diabetics monitor blood-sugar levels is growing after the tech giant filed a patent application for the device.

The gadget described in the patent works by pricking the finger and drawing blood without using a needle.

A detachable chamber is placed on top of a fingertip and a gas-powered microparticle blasted through it towards the skin, according to Google’s application filed with the U.S. Patent and Trademark Office.

The microparticle — which could be as small as 10 microns, or 10 millionths of a meter — pierces the skin and the device draws a small vial of blood into a pressurized chamber.

Now containing a blood sample, the device is reattached to the watch, which could be used to measure glucose levels.

Google declined to confirm if the invention would be used to create a new product.

“We hold patents on a variety of ideas — some of those ideas later mature into real products or services, some don’t,” a Google spokesperson told the Verge.

“Prospective product announcements should not necessarily be inferred from our patents.”