Two different ways of expressing breathing, one as if using a ventilator at the mouth and the other one as human pleural muscle generating pressure gradient against external pressure. Three models used to compare differences.
Model number: 0180
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These models compare three situations, each with two compartments having resistances, compliances, switches and initial masses of specie in the two tanks. The first model has a pressure source in external air as in the case of breathing support of patient with a ventilator. The second model has a pressure source attached to the most inner tank as in the case of regular human breathing, when the tension of pleural muscle controls the generated pressure difference. Depending on the compliances and volumes of the tanks, time elapsed to reach the stationary conditions may vary slightly. However, the two cases show the same long time flow and concentration characteristics. The last model shows the case when internal and external pressure sources are applied simultaneously. It simulates the situation when a patient initially on a breathing support starts to breath on his own, but the ventilator is still active.
External Pressure Source at the mouth
**Pleural Muscle as a Pressure Source**
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Posted by: BEJ
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[This page was last modified 02Nov16, 2:41 pm.]
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