Make it like a turtle shell, hooked up to something like this: https://en.wikipedia.org/wiki/Rotary_woofer https://en.wikipedia.org/wiki/Rotary_woofer That le

Make it like a turtle shell, hooked up to something like this: https://en.wikipedia.org/wiki/Rotary_woofer https://en.wikipedia.org/wiki/Rotary_woofer That lets you use both positive and negative pressure. You could even support fast pulses for clearing out gunk from the lungs.