| 摘要 |
A pulmonary exercise device includes a tubular body with an air inlet, an air outlet and a mouthpiece. The air inlet is closed by a one-way valve arrangement which is resiliently biased using a spring. The air outlet is closed by a one-way valve arrangement which is resiliently biased closed by using a spring. In another aspect, the inlet and outlet are closed off by respective one way valves which prevent airflow in one direction and allow only a restricted flow in the other. |
