Dosing device for adding an additive fluid to breathing gas in a

Details Dosing device for adding an additive fluid to breathing gas in a Dosing device for adding an additive fluid to breathing gas in a

1997-04-24

2000-03-07

Lewis, Aaron J.

Surgery

Respiratory method or device

Means for mixing treating agent with respiratory gas

12820314, A61M 1500

Patent

active

060326654

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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