Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1985-11-15
1987-03-24
Recla, Henry J.
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
12820422, 12820328, A61M 1600
Patent
active
046517294
ABSTRACT:
An anaesthetic gas flow regulator includes an oxygen gas flow line connected to a supply of oxygen, an anaesthesia gas flow line connected to a supply of anaesthesia gas, controllable valves connected to the oxygen and anaesthesia gas flow lines, a patient rebreathing circle for delivering and exhausting a mixture of oxygen and anaesthesia gas to and from the patient to a common outlet means, an oxygen analyzer and a gas volume analyzer. The oxygen analyzer senses the oxygen concentration of the mixture of oxygen and anaesthesia gas in the rebreathing circle, and provides an oxygen signal when a minimum predetermined oxygen concentration is sensed by the oxygen analyzer. The volume sensor generates a volume signal indicative of a minimum volume threshold value in the rebreathing circle. Control circuitry is provided responsive to the oxygen and volume signals developed by the oxygen analyzer and the volume sensor to supply a controlled amount of either oxygen or anesthesia gas to the rebreathing circle through the common outlet. The control circuit assures that the volume in the patient rebreathing circle is kept constant, and oxygen is delivered to the patient rebreathing circle only when a minimum predetermined signal is sensed by the oxygen analyzer, otherwise anaesthesia gas is delivered to the patient rebreathing circle to maintain the volume of gas flow therein substantially constant.
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