Manual respirator apparatus for use with automatic respirators

Claim 1

A manual respirator apparatus for connection to an inhalation line which is connectable between an automatic respirator and a patient and is also connected to means for supplying a breathing gas under pressure, comprising, a blocked housing having a breathing gas supply inlet connectable to the means for supplying a breathing gas under pressure, an inhalation line inlet in said housing connectable to the inhalation line, an inhalation line outlet in the housing connected to said inhalation line inlet and connectable to the patient, an exhalation line inlet connectable from the patient and connected to the housing for receiving the exhalation gas from the patient, said housing having a pressure chamber therein, an elastic breathing gas bag connected to said pressure chamber and being expandible and compressible during exhalation and inhalation to vary the pressure in said pressure chamber, a connection passage in said housing between said gas supply inlet and said pressure chamber, adjustable valve means in said pressure chamber and in said connection passage responsive to pressure in said pressure chamber and said breathing gas bag to permit flow of breathing gas through said connection passage to said breathing gas bag, a delivery passage between said pressure chamber and said inhalation line inlet, outlet valve means in said delivery passage openable at a predetermined pressure to pass breathing gas from said pressure chamber to said inhalation line inlet when said breathing gas bag is compressed, an exhalation line output in the housing connected to said exhalation line inlet for the venting of exhalation gas from the housing, a control chamber in said housing adjacent and connected to said exhalation line inlet, a diaphragm in said control chamber positioned to close said exhalation line inlet during inhalation and to open said exhalation line inlet during exhalation, and a pressure line connection between said control chamber with said diaphragm and said delivery passage for regulating the movement of said diaphragm in accordance with the pressure in said pressure chamber so that said exhalation line inlet is closed when said breathing gas bag is compressed, said outlet valve means comprising first and second outlet valve members arranged in series in said delivery passage and biasing means connected to said first and second valve outlet members for biasing said respective first and second outlet valve members toward closed positions thereof when said gas bag is not compressed to maintain the pressure in said pressure chambers and to close said inhalation line inlet with respect to said pressure line, said pressure line connection connected to said delivery passage between said first and second outlet valve members.