Each year, choking claims the lives of more than 4,100 Americans who are 65 or older. It's the most vulnerable age group, accounting for about three-quarters of U.S. choking deaths. A number of companies are marketing antichoking devices to the elderly. They vary in design, but generally the devices look like a face mask attached to a tube or bellows, with a handle at the end. Medical professionals have been debating whether to endorse the products, saying more research is needed. Experts — and even antichoking device manufacturers — say that back blows and abdominal thrusts should always be tried first.