Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1981-03-30
1982-12-21
Recla, Henry J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820512, 12820516, A62B 704
Patent
active
043643841
ABSTRACT:
An excess pressure respirator with automatic or manual shutoff valve is disclosed. A breathing bag having at least one movable plate member is utilized to receive and supply breathing air from a user. The plate member is biased to reduce the volume of the bag and apply pressure to the contents of the bag. A pressurized gas source is connected through a connecting line to the bag. A dosing valve is positioned in the connecting line to be opened when the volume of the bag is reduced during an inhalation cycle and then closed so that a dosed quantity of oxygen is supplied to the bag. A shutoff valve is also provided in the connection for shutting flow of breathing gas from the source entirely when the bag falls below a minimum volume which is indicative of a large leak or the removal of a gas mask from the user's face. A manual shutoff may also be provided in the form of a movable block which stops the movement of the biased plate member before it engages the dosing valve to open it.
REFERENCES:
patent: 2853268 (1958-09-01), Hughes
patent: 2900977 (1959-08-01), Marsh
patent: 3180356 (1965-04-01), Galley
patent: 3692047 (1972-09-01), Camp
patent: 3794021 (1974-02-01), Lambertsen
patent: 4252114 (1981-02-01), Seres et al.
Pasternack Adalbert
Warncke Ernst
Dragerwerk Aktiengesellschaft
Recla Henry J.
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