Insurance companies in Maryland only cover one prosthetic device, usually the most basic kind. That is - until two days ago. "It's opening up a whole world to them that they didn't actually know would exist," Sheryl Sachs, a clinician at Linthicum-based prosthetic company, Dankmeyer Inc., said of her patients. Last year, WMAR-2 News told you how Sheryl Sachs and John Edward Heath teamed up to fight for legislation that would expand insurance coverage for prostheses. The pair worked to convince lawmakers and lobbyists that each device would only cost insurance companies a few cents a month.