Intermittent positive pressure breathing apparatus

Claim 1

INTERMITTENT POSITIVE PRESSURE BREATHING APPARATUS COMPRISING A CONDUIT HAVING AN OUTLET END, A NOZZLE CONNECTED TO SAID END OF THE CONDUIT AND PROVIDED WITH A RESTRICTED PASSAGE, MEANS FOR INTERMITTENTLY SUPPLYING COMPRESSED GAS THROUGH SAID CONDUIT TO THE NOZZLE, A TUBE FOR RECEIVING GAS FROM SAID NOZZLE AT A LOWER PRESSURE THAN IT ENTERS THE NOZZLE AND HAVING AN OUTLET ADAPTED TO DELIVER SAID GAS TO A PATIENT, A VALVE HOUSING HAVING AN INLET FOR CONNECTION TO A SUPPLEMENTAL GAS SOURCE AND HAVING AN OUTLET CONNECTED WITH SAID TUBE, SAID HOUSING CONTAINING A VALVE PORT, A CLOSURE MEMBER AT THE INLET SIDE OF SAID PORT NORMALLY CLOSING THE PORT, A STEM EXTENDING THROUGH THE PORT AND CONNECTED AT ONE END OF THE CLOSURE MEMBER, A FLEXIBLE DIAPHRAGM MOUNTED IN THE HOUSING AND ENGAGING THE OPPOSITE END OF SAID STEM, SAID VALVE OUTLET BEING LOCATED BETWEEN SAID PORT AND ONE SIDE OF THE DIAPHRAGM, AND MEANS CONNECTING SAID CONDUIT WITH THE INSIDE OF SAID HOUSING AT THE OPPOSITE SIDE OF THE DIAPHRAGM SO THAT GAS PRESSURE IN THE CONDUIT WILL FLEX THE DIAPHRAGM AND CAUSE IT TO PUSH SAID CLOSURE MEMBER AWAY FROM SAID PORT.