Lung ventilating equipment

Claim 1

LUNG VENTILATING EQUIPMENT COMPRISING A PATIENT''S CIRCUIT INCLUDING MEANS ADAPTED TO BE ASSOCIATED WITH A PATIENT FOR SUPPLY OF BREATHING GAS AND FURTHER INCLUDING A BELLOWS COLLAPSIBLE TO DEVELOP PRESSURE IN THE PATIENT''S CIRCUIT TO EFFECT INSPIRATION BY THE PATIENT, A CHAMBER SURROUNDING THE BELLOWS, POWER MEANS FOR INTRODUCING PRESSURE INTO SAID CHAMBER TO EFFECT COLLAPSE OF THE BELLOWS AND INSPIRATION BY THE PATIENT, AN EXPIRATION VALVE ASSOCIATED WITH THE PATIENT''S CIRCUIT FOR DISCHARGE OF EXPIRATORY GAS, VALVE MEANS FOR BLOCKING OR PASSING THE PRESSURE SUPPLIED BY THE POWER MEANS INTO SAID CHAMBER, AN EXHAUST VALVE FOR RELIEVING PRESSURE IN SAID CHAMBER WHEN THE BELLOWS EXPANDS, SAID EXPIRATION VALVE AND SAID EXHAUST VALVE HAVING PRESSURE RESPONSIVE DEVICES ASSOCIATED THEREWITH FOR HOLDING THOSE VALVES CLOSED DURING THE INTRODUCTION OF PRESSURE THERETO, PRESSURE SUPPLY PASSAGES CONTROLLED BY SAID VALVE MEANS FOR THE INTRODUCTION OF PRESSURE TO SAID PRESSURE RESPONSIVE DEVICES WHEN SAID VALVE MEANS PASSES PRESSURE INTO SAID CHAMBER; PORTAGE FOR VENTING SAID PRESSURE SUPPLY PASSAGES AND MEANS CONTROLLED BY SAID VALVE MEANS TO OPEN SAID PORTAGE WHEN THE VALVE MEANS IS OPERATED TO BLOCK DELIVERY OF PRESSURE INTO SAID CHAMBER AND THEREBY PROVIDE FOR OPENING OF BOTH THE EXPIRATION VALVE AND THE EXHAUST VALVE DURING EXPANSION OF THE BELLOWS AND TO CLOSE SAID PORTAGE WHEN THE VALVE MEANS PASSES PASSAGE INTO THE CHAMBER.