Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1996-03-29
1997-09-02
Asher, Kimberly L.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820428, 12820222, 12820513, A62B 704, A61M 1600, F16K 3126, G08B 300
Patent
active
056620993
ABSTRACT:
An improved system for the determining the collapse of a bellows within a canister as part of a ventilator system for delivering breaths to a patient via a patient circuit. The system measures the pressure in the bellows canister external of the bellows and measures the pressure within the interior of the bellow. A processor compares the pressures and determines when the pressure within the canister exceeds a predetermined offset in excess of the pressure within the interior of the bellows to conclude that the bellows is in a collapsed condition. In the preferred embodiment, the processor also uses, as input data, the flow delivered by the ventilator to the bellows canister to determine that offset value. When a bellows empty condition is determined, various actions can be taken, among them to signal an alarm and also to change various functions of the ventilator to prevent further difficulties in the overall system. In addition, the recognition of a bellows collapsed condition and an alarm or remedial action provides a safety measure to the patient in the event the pressure sensor that measures the pressure in the patient breathing circuit is missing or fails to a zero level.
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Hendrickson Carl H.
Somerson Steven K.
Tissot Kevin G.
Tobia Ronald L.
Asher Kimberly L.
Ohmeda Inc.
Pace Salvatore P.
Rathbun Roger M.
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