Dec. 27, Health Tech Insider: Masters research students at Carnegie Mellon’s Institute for Software Research have developed a new prototype wristband wearable that detects opioid overdose in the wearer, sending alerts to emergency personnel in real-time. The students combined a pulse oximetry sensor, which measures blood oxygen levels, and Bluetooth wireless transceiver. If the user’s blood oxygen level drops for more than 30 seconds, an LED on the device turns red and an alert is sent.