I've watched the show a few times... Unless you can get a patent on the design or something else that keeps people from directly ripping you off... It doesn't seem they'll buy in, but they'll just rip you apart.
Personally, I love your creation.
Yep you'd better have a patent(s), AND make sure you aren't inadvertently using existing patents. Most patents aren't in use, and if you go on tv without knowing first, you may cause yourself some grief.