A Cleveland startup is developing a battery powered pen-like device that uses cold plasma technology to sterilize and heal wounds, including those infected with drug-resistant bacteria like MRSA. Sterionics, which licensed its technology from Russian scientists, is currently performing in vitro tests of its sterilization device. The company hopes to initially sell to the military for battlefield use, but eventually wants to expand into the chronic wound care, emergency medicine, home healthcare and veterinary markets, acting CEO Steve Weeks said. Weeks pegs the annual U.S. wound care market at $15 billion.