The device, which sits on the stomach, injects naloxone into the circulatory system when it senses the users stops moving and breathing - and did so in 15 seconds during tests.
Although the drug naloxone can be a lifesaver in cases of opioid overdose, it has to be administered quickly. That's where a new wearable device comes in, as it's designed to first detect the effects of an overdose, and then deliver an injection of naloxone.