초록 ▼

In anesthesia apparatus for supplying oxygen and an anesthesia gas through respective flow control valves to a patient breathing circuit a low oxygen flow alarm system is provided. The alarm system includes a restrictor in the pipeline of the oxygen flow control valve and a restrictor in the pipelin

In anesthesia apparatus for supplying oxygen and an anesthesia gas through respective flow control valves to a patient breathing circuit a low oxygen flow alarm system is provided. The alarm system includes a restrictor in the pipeline of the oxygen flow control valve and a restrictor in the pipeline of the anesthesia gas flow control valve. A differential pressure sensing unit including a diaphragm assembly responsive to the pressure in the oxygen pipeline and another diaphragm assembly responsive to the pressure in the anesthesia gas pipeline is coupled to the restrictor pipelines. The diaphragm assemblies are opposed to each other and coupled together by a displaceable linkage. Electrical switch means are provided coupled to the linkage to provide an alarm signal when the linkage has been moved to a predetermined position indicating that the oxygen concentration has dropped below a predetermined value. The differential pressure sensing unit includes spring biasing means.

대표청구항 ▼

An alarm system for use with anesthesia apparatus supplying oxygen through one line into a manifold while supplying an anesthesia gas through a second line into the manifold, said alarm system comprising first pressure actuated means responsive to the oxygen pressure in said first line and having a

An alarm system for use with anesthesia apparatus supplying oxygen through one line into a manifold while supplying an anesthesia gas through a second line into the manifold, said alarm system comprising first pressure actuated means responsive to the oxygen pressure in said first line and having a first output member whose position is dependent upon said oxygen pressure, second pressure actuated means responsive to the anesthesia gas pressure in said second line and having a second output member whose position is dependent upon anesthesia gas pressure, and alarm means including displaceable means, said first and second output members being coupled to said displaceable means and acting in opposition therein, such that said first output means tends to move the displaceable means in a first direction while said second output means tends to move the displaceable means in a second direction, said alarm means producing an alarm signal wherever said displaceable means has been moved in said second direction to predetermined position.