NanoVibronix's PainShield MD reminds us (a little bit) of DARPA's wound-healing ultrasound wrap, but its purpose is to stop pain, not bleeding. The pocket-sized device emits ultrasonic waves through a disposable patch that can easily be slapped onto the patient's skin. The fundamental tech isn't new, but NanoVibronix is hoping doctors and patients will pick PainShield up because it's portable and convenient; the patch means medical personnel don't have to hold or operate anything during treatment. It's just been cleared by the FDA, so it should reach the market soon-ish.