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https://biomedical-engineering-online.biomedcentral.com/articles/10.1186/s12938-018-0540-2
Not until you'd linked it, but as with many of the steth's produced- the focus is heavy on cardiology exam- which though I love to do- only represents 1/3 ish of what I use mine for.
The OG paper by Littman suggests I should be looking at 60-1k Hz, and I guess the optimal outcome would be to produce a filter that isolated sounds either side of that frequency range.
Then it would go Bell/Diaprhagm-tubing-mic-filter-output.
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Would it not be easier to fit some kind of pad on the right ear tube which stops it from going in your ear. Some kind of silicon a bit like the suction cups that hold hooks to tiles or glass with the hook removed, the earcup might fit in the tube bit on the back. A piece of lint and surgical gauze could wrap it daily/hourly depending on how sterile you need it to be.
Maybe doesn't work to help them hang from the head though.
Airhead
Have you seen this paper?
https://biomedical-engineering-online.biomedcentral.com/articles/10.1186/s12938-018-0540-2