Moisture resistant airway adapter for monitoring constituent gases
First Claim
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1. An airway adapter for use with a respiratory gas analyzer comprising:
- a tubular portion having a window positioned whereby respiratory gases passing through the adapter flow past said window and being adapted to receive an emitter and a receiver for measuring through the window energy absorbance of a constituent gas in the respiratory gases;
wherein said window comprises at least one surface producing a sessile drop contact angle of 50E or less which interacts with moisture condensed thereon from the respiratory gases so as to reduce the interference of such condensation with the measurement of the constituent gas by the gas analyzer.
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Abstract
An airway adapter comprising a tubular portion having opposing windows in a predetermined spaced configuration. The windows have at least one surface which interacts with moisture condensed thereon from respiratory gases so as to reduce the interference of such condensation with the measurement of constituent gases by a gas analyzer. The surface of the windows can be hydrophobic, hydrophilic, or a combination thereof.
91 Citations
24 Claims
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1. An airway adapter for use with a respiratory gas analyzer comprising:
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a tubular portion having a window positioned whereby respiratory gases passing through the adapter flow past said window and being adapted to receive an emitter and a receiver for measuring through the window energy absorbance of a constituent gas in the respiratory gases; wherein said window comprises at least one surface producing a sessile drop contact angle of 50E or less which interacts with moisture condensed thereon from the respiratory gases so as to reduce the interference of such condensation with the measurement of the constituent gas by the gas analyzer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An airway adapter for use with a respiratory gas analyzer comprising:
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a tubular portion having a window positioned whereby respiratory gases passing through the adapter flow past said window and being adapted to receive an emitter and a receiver for measuring through the window energy absorbance of a constituent gas in the respiratory gases; wherein said window comprises at least one surface producing a sessile drop contact angle of 94E or greater which interacts with moisture condensed thereon from the respiratory gases so as to reduce the interference of such condensation with the measurement of a constituent gas by the gas analyzer. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for measuring the energy absorbance of a constituent gas in respiratory gases comprising:
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providing a respiratory gas analyzer having an emitter and a receiver; providing an airway adapter having a tubular portion having opposing windows positioned whereby the respiratory gases pass through the adapter and flow between said opposing windows, said airway adapter being adapted to receive the emitter and receiver for measuring through the windows the energy absorbance of the constituent gas; wherein said windows comprise at least one surface producing a sessile drop contact angle of 50E or less which interacts with moisture condensed thereon from the respiratory gases so as to reduce the interference of such condensation with the measurement of the constituent gas by the gas analyzer; and measuring the energy absorbance of the constituent gas in the respiratory gases with the respiratory gas analyzer.
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24. A method for measuring the energy absorbance of a constituent gas in respiratory gases comprising:
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providing a respiratory gas analyzer having an emitter and a receiver; providing an airway adapter having a tubular portion having opposing windows positioned whereby the respiratory gases pass through the adapter and flow between said opposing windows, said airway adapter being adapted to receive the emitter and receiver for measuring through the windows the energy absorbance of the constituent gas; wherein said windows comprise at least one surface producing a sessile drop contact angle of 94E or greater which interacts with moisture condensed thereon from the respiratory gases so as to reduce the interference of such condensation with the measurement of the constituent gas by the gas analyzer; and measuring the energy absorbance of the constituent gas in the respiratory gases with the respiratory gas analyzer.
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Specification