I heard that there is a kind of air mattress bed, can prevent bedsores, quite good, where to sell ah?

Hello, my friend is using this kind of air mattress bed it, is the brand of Shanghai Erma, double movement mute electric pump medical jet air mattress. He said, with the okay, is in Beijing Tongzhou District Luhe Hospital south of the medical equipment store to buy, they are national chain stores. Good service, and good after-sales service, bought two years, there has not been any problem it, with the okay.