Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1994-08-10
1996-01-23
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820426, 12820427, A62B 900
Patent
active
054858348
ABSTRACT:
This invention is a manually tunable underwater breathing apparatus (UBA) which the resonant frequency of the UBA may be adjusted to meet the diver's breathing frequency by controlling the inertance component of the UBA impedance. The principles of the present invention may be adapted to existing UBA by adding a tuning apparatus comprising a valve, a tee and a tuned length of hose. Water displaced by volume change in the breathing bag due to exhalation/inhalation is partly diverted through the valve. Depending on the valve opening set by the diver the inertance and resonant frequency of the UBA can be altered to reduce breathing load.
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Clarke John R.
Joye Donald D.
Mints William H.
Wechgelaer Peter
Burr Edgar S.
Garvert William C.
Spevack A. David
Srivastava V.
The United States of America as represented by the Secretary of
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