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What's a nice idea like yours doing in a place like this?
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Throw up with less unpleasantness
This device is a hose designed to be inserted into one's
throat when one is vomiting or plans to do so. The outside is
coated with a powerful topical nontoxic analgesic. The end to
be inserted is soft and blunt. The tube would have
instructions for inserting into one's esophagus (as opposed to
windpipe) It would also be a shape that makes it difficult to
miss the esophagus.
After insertion the end inside the throat expands to block off
material from flowing around it. (just pull a string enclosed in
the tube, releasing a spring) After use pulling a differently
colored string shrinks the end back again.