Try Olympus. Their UK website describes something that sounds like it's what you want:
http://www.keymed.co.uk/index.cfm/page/products.index.cfm/id/253/navid/253/parentid/206
Here is their US version, but it provides less detail:
http://www.olympussurgical.com/index.cfm/page/products.index.cfm/cid/107/navid/986/parentid/527
Happy intubating!