I purchased one of these devices several months ago.

I have a very damaged throat with one paralyzed vocal cord which has an implant to push it to the center so the remaining vocal cord can close off the trachea when needed. So far my wife has had to literally jump on my back to dislodge an obstruction as I was passed out on the floor.

I tried all the usual tricks like falling on a table edge and falling face forward onto the floor. Nothing worked and my vision became black and white, with tunnel vision fading to black. I revived spontaneously when the obstruction was expelled. An unpleasant experience.

I was messing around with it and found the amount of suction to be quit strong. Hope I never have to depend on it.

I believe it has a 3(?) year expiration date.

The alternative is a self tracheotomy which according to the literature has been successful....once.