Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1996-10-11
1998-09-15
Lewis, Aaron J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820428, 12820312, 12820314, A61M 1601
Patent
active
058065130
ABSTRACT:
Efficient management of breathing gases and anesthesia is achieved in an anesthesia delivery system which incorporates a flow minimization routine. The breathing circuit is provided with a pop-off valve and a flow sensor for detecting the pop-off flow. The flow rate of fresh gas into the breathing circuit is controlled, preferably via a digital computer, to minimize the amount of gas exhausted from the circuit. A control routine determines the minimal fresh gas flow necessary to maintain appropriate oxygen concentration, anesthetic agent concentration pop-off flow. A minimum value for the fresh gas flow may also be input to the control system. A fresh gas flow boost routine provides quick responses to charges in the user-set oxygen and agent concentrations. A circuit fill routine provides fresh gas to fill the breathing circuit until pop-off flow is sensed.
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Bathe Duncan P. L.
Keitel Todd
Tham Robert Q.
Lewis Aaron J.
Ohmeda Inc.
Pace Salvatore P.
Rathbun Roger M.
Srivastava V.
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