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Although the Flutter valve is a durable and easy-to-use device, National Jewish has drifted away from it because patients with poor lung function cannot lift the ball bearing on it and it can be used only in the upright position, whereas the Acapella valve can be used in multiple positions.
A physiological comparison of flutter valve drainage bags and underwater seal systems for post operative air leaks.
The egress track works like a flutter valve out of the joint so the fluid cannot re-enter it.