Madison-based Swallow Solutions has raised nearly $450,000 from nine investors, and the total could increase to $750,000, according to an SEC filing. Swallow, which raised $1.1 million in March, is developing a device designed to help patients strengthen the mouth and throat muscles used in swallowing. Company founder JoAnne Robbins referred a request for comment to CEO Eric Horler, who could not immediately be reached. To read the full Xconomy roundup, click here.