Method and apparatus for mixing a gas containing nitric oxide with a gas containing oxygen
First Claim
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1. A method for mixing flowing gases comprises the steps of:
- providing a first gas containing nitric oxide;
providing a second gas containing oxygen flowing along a flow path; and
mixing said first gas at a predetermined concentration into said flow path of said second gas with minimized formation of nitrogen dioxide in said flow path, by adding said first gas to said second gas at at least two mixing points disposed at predetermined distances from each other along said flow path.
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Abstract
During the administration of NO to a patient, NO reacts with oxygen in the respiratory gas to form NO2. Since NO2 is a toxic gas, minimizing the formation of this gas is important. A previously unknown property of NO is that an initial amount of NO2 is formed when NO and O2 mix. By adding NO to respiratory gas at a number of spaced-apart mixing points, the total initial amount of NO2 formed can be reduced. In a method and a device for mixing and administering NO, the gas containing NO is supplied to a flow divider for distributing the flow and sending sub-flows to a number of various mixing points.
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Citations
8 Claims
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1. A method for mixing flowing gases comprises the steps of:
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providing a first gas containing nitric oxide; providing a second gas containing oxygen flowing along a flow path; and mixing said first gas at a predetermined concentration into said flow path of said second gas with minimized formation of nitrogen dioxide in said flow path, by adding said first gas to said second gas at at least two mixing points disposed at predetermined distances from each other along said flow path. - View Dependent Claims (2, 3)
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4. A device for mixing flowing gases comprising:
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a gas source containing a first gas containing nitric oxide; a flow channel in which a second gas containing oxygen flows; at least two mixing points disposed at a predetermined distance from each other along said flow channel; and means for supplying said first gas to each of said mixing points for mixing said first and second gases for forming a gas mixture having a predetermined concentration of nitric oxide therein, with minimized formation of nitrogen dioxide in said mixture. - View Dependent Claims (5, 6, 7, 8)
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Specification