| 摘要 |
A breathing exercise device is formed of a tubular body with a mouthpiece at its proximal end, a resistor sleeve coaxial with the body tube and having a number of resistance openings which align with a body tube opening, and a selective one way flap valve assembly disposed at the distal end of the body tube. The flap valve assembly can be rotated 180 degrees to change the mode of the breathing exercise device from inhalation to exhalation thereapy, or vice versa.
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