What's wrong with my 'anti-choking device' experiment?
I bought 3 of these anti-choking devices. Naturally I tested it on my own face and was surprised to feel there was no suction (good fit, no air leaks/facial hair etc.). So I snuggly fitted this 3mm diameter hose into the lunchbox lid, with the hose tip submerged in water. Again, with a good seal of the mask to the lunchbox lid, and good connection of mask to device, when I attempt maximum suction, water barely rises up the tube about 2-4cm for about half of a second (on all 3 devices).
Is my experiment flawed or did I waste my money on these things? Should I be expecting more suction than that? I would have imagined you would need quite a powerful vacuum to shift a lodged grape from an airway. Thanks all!
Picture here https://imgur.com/a/EeMIBl0