There are various brands It is marketed as something that might work when you are alone and self Heimlich manueveres fail
Basically instead of creating force from the inside with abdominal pressure it pulls from the outside. I have one and tested it once (I was not choking). As I said above I think it might move a very solid chunk but I do not think it would work to replace suction for secretion management. I also found it very unpleasant
One brand is lifevac but there are others