Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1990-01-05
1992-06-09
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820422, 12820312, 12820523, A61M 1600, A62B 704, F16K 3126
Patent
active
051198100
ABSTRACT:
The invention is directed to a ventilating apparatus including a ventilating device and a closed breathing circuit wherein fresh gas is metered by means of a controller via a fresh gas line. A reservoir having a changeable volume is connected to the fresh gas line. In this way, at least the quantity of respirating gas which is consumed is again replenished. This arrangement is improved such that a very small quantity of respirating gas can be metered with the compliance of the entire system being low and remaining necessarily constant. With the invention, a system is obtained which is easy to control with the smallest possible configuration and least complex measuring sensors. For this purpose, a reservoir connected downstream of the metering unit is branched off of the fresh gas line and is provided with a level indicator. The signal of the level indicator indicates the level and is supplied as an actual value to the controller and compared to a pregiven desired value. A cutoff device is interposed ahead of the location at which the fresh gas line communicates with the breathing circuit.
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The United States Patent Quarterly, 42US PQ, p. 526-528, The Bureau of National Affairs, Inc., Wash., D.C., Sep. 9, 1955.
Kiske Siegfried
Sauer Wolfgang
Wallroth Carl F.
Asher Kimberly L.
Burr Edgar S.
Dragerwerk Aktiengesellschaft
Ottesen Walter
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