Sonavex, Inc., a privately held medical device company focused on empowered patient care, announced that it received a $3 million Phase IIB Small Business Innovation Research (SBIR) grant from the National Institutes of Health to use its EchoMark & EchoSure devices to support arteriovenous (AV) fistula maturation and long-term viability. The award provides capital for prospective clinical studies and continued research and development efforts.