Surgery – Respiratory method or device – Including body or head supported means covering user's scalp
Patent
1985-12-23
1987-06-30
Recla, Henry J.
Surgery
Respiratory method or device
Including body or head supported means covering user's scalp
12820125, 12820028, A62B 700
Patent
active
046762361
ABSTRACT:
An airflow system for use with a helmet includes a face piece adapted to enclose the eyes of the wearer to form a first cavity and to enclose the nose and mouth of the wearer to form a second cavity isolated from the first cavity. Filtered air normally flows through an inlet to the first cavity, from which it flows to the second cavity through a conduit and eventually to the ambient region through an exhalation duct leading from the second cavity. The air is supplied under pressure to the first cavity and the exhalation duct provided with check valves at its inlet and outlet to maintain a positive pressure in the first cavity, thereby to prevent the infiltration of noxious gases, over most of the breathing range. A spring-loaded check valve normally admits additional air directly to the second cavity through a second inlet to prevent excessive airflow through the first cavity across the eyes of the wearer. A check valve in the conduit connecting the first and second cavities prevents fogging of the visor due to backflow of exhaled air. Air is also directed from the mask through a check valve to the over-the-head region enclosed by the helmet to cool the wearer's head and to create a positive pressure to prevent the seepage of unfiltered gases into that region.
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Giacomini William P.
Piorkowski Gary J.
Gentex Corporation
Recla Henry J.
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