Device for treatment of pulmonary diseases

Claim 1

A PRESSURE CONTROL APPARATUS FOR REGULATING THE FLOW OF GAS FROM A SOURCE OF GAS UNDER PRESSURE INTO A CLOSED VOLUME, SAID APPARATUS INCLUDING A HOUSING DEFINING A GAS RECEIVING CHAMBER COMMUNICATING WITH AND FORMING A PART OF SAID CLOSED VOLUME, PRESSURE SENSITIVE MEANS COMMUNICATING WITH SAID CHAMBER, MEANS PROVIDING A GAS INLET TO SAID CHAMBER COMMUNICATING WITH THE SOURCE OF GAS UNDER PRESSURE, MEANS PROVIDING A GAS OUTLET FROM SAID CHAMBER COMMUNICATING WITH THE AMBIENT ATMOSPHERE, A VALVE MEMBER, DISPOSED IN SAID CHAMBER FOR ALTERNATELY COVERING THE GAS INLET AND THE GAS OUTLET, VALVE OPERATING MEANS RESPONSIVE TO SAID PRESSURE SENSITIVE MEANS FOR ACTUATING SAID VALVE MEMBER SO AS TO CLOSE THE GAS INLET WHEN THE GAS PRESSURE IN SAID CHAMBER OBTAINS A PREDETERMINED MAXIMUM VALUE AND TO CLOSE THE GAS OUTLET WHEN THE GAS PRESSURE IN SAID CHAMBER OBTAINS A PREDETERMINED MINIMUM VALUE, AND YIELDING MEANS FOR MANUALLY ACTUATING SAID VALVE OPERATING MEANS SO AS TO CLOSE THE GAS OUTLET WHEN THE GAS PRESSURE IN SAID CHAMBER IS GREATER THAN THE MINIMUM VALVE, SAID YIELDING MEANS YIELDING WHEN THE GAS PRESSURE IN SAID CHAMBER EXCEEDS A PREDETERMINED MAXIMUM VALUE.