A new program to help medical device manufacturers in the Buffalo Niagara region sell their products in China got a boost Thursday from nearly $700,000 in federal and local funding aimed at helping those companies clear export-related hurdles. The three-year program, which will be administered by the World Trade Center of Buffalo Niagara, is designed to help local medical device manufacturers learn the ins and outs of exporting to China, a fast-growing market with a vast population that is expected to become one of the world’s largest markets for medical devices.