Importance

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Abstract

A system for sequentially providing a volume of gas containing a high frequency oscillation to a proximal airway. In a preferred embodiment a control means periodically drives in synchronism both inhalation and exhalation means into an inspiratory phase of an oscillatory cycle and then into an expiratory phase of the oscillatory cycle. The inhalation means during the inspiratory phase delivers a volume of fresh gas to the proximal airway of a patient, and during the expiratory phase refills itself from a source of low pressure gas while simultaneously blocking therefrom expired gas from the proximal airway. The exhalation means during the inspiratory phase vents to atmosphere expired gas withdrawn from the proximal airway during the previous expiratory phase and simultaneously blocks therefrom fresh gas from said inhalation means and during the expiratory phase extracts the expired volume of gas from the proximal airway.

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First Claim