Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1989-11-13
1992-03-24
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820523, 12820222, 12820426, A61M 1600
Patent
active
050978268
ABSTRACT:
There is disclosed a pressure monitoring device for self-containing breathing apparatus including visual indicators disposed in the field of view from the headpiece to monitor when predetermine pressure levels are reached in the tank which supplies gas to that headpiece. The predetermined pressure levels are referenced to the residual tank pressure at which the required breathing gas flow is not sustained and visual alarm provisions anticipate those predetermined pressure levels which are critical, in some embodiments of the invention. A cost effective transducer of reduced pressure range senses the tank pressure and noise is eliminated from the transducer signal by common mode rejection in still other embodiments.
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Armstrong Robert M.
Coombs Christopher E.
Gray Robert E.
Keohane Gene
Burr Edgar S.
Cairns & Brother Inc.
Lewis Aaron J.
Marn Louis E.
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