Dosing device for adding an additive fluid to breathing gas in an anaesthesia machine or ventilator
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United States of America Patent
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-
Mar 7, 2000
Grant Date -
N/A
app pub date -
Apr 24, 1997
filing date -
May 6, 1996
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A dosing device for adding small amounts of an additive gas or liquid, such as NO or liquid anaesthetic, to a breathing gas in an inspiratory line in an anaesthetic machine or ventilator, has a constant-volume dosing chamber with an inlet, equipped with a first valve, for connection to a source of gas or liquid supplying the additive gas or liquid at a predetermined, constant, positive pressure, and an outlet, equipped with a second valve, for injecting gas or liquid from the dosing chamber into breathing gas. Control elements are arranged to open and close the valves in a controlled fashion. A control unit is also arranged to cause the operating elements to open the second valve for one or a number of predetermined intervals during the inspiratory phase.
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