Method and arrangement for determining sample flow volume
First Claim
1. A method for determining a sample flow volume comprising:
- withdrawing a sample flow at a first and second flow rate from a gas flow;
measuring a concentration of at least one gas component of the sample flow;
measuring at least one of an airway pressure and flow of said gas flow when withdrawing at said first and second flow rate;
generating first measurement results based on said measuring the concentration;
generating second measurement results based on said measuring at least one of said airway pressure and flow;
setting a suitable point of comparison both among said first and second measurement results;
determining a first time delay between said point of comparison of said first and second measurement results of said first flow rate;
determining a second time delay between said point of comparison of said first and second measurement results of said second flow rate;
providing information about said first and second flow rate; and
determining the sample volume based on differences between the first and second time delay.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for determining a sample flow volume is disclosed herein. The method includes withdrawing the sample flow at a first and second flow rate from a gas flow, measuring a concentration of at least one gas component and measuring at least one of an airway pressure and flow. The method also includes generating first measurement results based on the concentration, generating second measurement results based on the at least one of the airway pressure and flow and setting a suitable point of comparison. The method further includes determining a first and second time delay between the point of comparison of the first and second measurement results of the first and second flow rate, providing information about the first and second sample flow rate and determining the sample volume based on differences between the first and second time delay. A corresponding arrangement is also provided.
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Citations
20 Claims
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1. A method for determining a sample flow volume comprising:
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withdrawing a sample flow at a first and second flow rate from a gas flow; measuring a concentration of at least one gas component of the sample flow; measuring at least one of an airway pressure and flow of said gas flow when withdrawing at said first and second flow rate; generating first measurement results based on said measuring the concentration; generating second measurement results based on said measuring at least one of said airway pressure and flow; setting a suitable point of comparison both among said first and second measurement results; determining a first time delay between said point of comparison of said first and second measurement results of said first flow rate; determining a second time delay between said point of comparison of said first and second measurement results of said second flow rate; providing information about said first and second flow rate; and determining the sample volume based on differences between the first and second time delay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An arrangement for determining a sample flow volume comprising:
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a pump for withdrawing a sample flow from a channel for a gas flow along a sampling tube at a first and second flow rate; an analyzer for measuring a concentration of at least one gas component withdrawn at said first and second flow rates; a measuring apparatus for measuring at least one of an airway pressure and flow of said gas flow when withdrawing at said first and second flow rate; and an electronics for generating first measurement results based on the measured concentration of at least one gas component withdrawn at a first and second flow rate and for generating second measurement results based on said at least one of said airway pressure and flow of said gas flow measured while withdrawing at said first and second flow rate and for setting a suitable point of comparison both among said first measurement results and among said second measurement results and for determining a first time delay between said point of comparison of said first measurement results and said point of comparison of said second measurement results of said first flow rate and for determining a second time delay between said point of comparison among said first measurement results and said point of comparison among said second measurement results of said second flow rate and for receiving an information about said first and second flow rate and for determining the sample volume based on differences between the first time delay at said first flow rate and the second time delay at said second flow rate. - View Dependent Claims (19)
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20. A method for determining a sample flow volume comprising:
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withdrawing a sample flow at a first and second flow rate from a gas flow; measuring a concentration of at least one gas component of the sample flow when withdrawing at said first and second flow rate; measuring at least one of an airway pressure and flow of said gas flow when withdrawing at said first and second flow rate; generating first measurement results as a function of time based on said measuring the concentration of said first and second flow rate; generating second measurement results as a function of time based on said measuring at least one of said airway pressure and when withdrawing at the first and second flow rates; setting a suitable point of comparison both among said first measurement results and said second measurement results of the first and second flow rate; determining a first time delay between said point of comparison of said first measurement results and said point of comparison of said second measurement results of said first flow rate; determining a second time delay between said point of comparison of said first measurement results and said point of comparison of said second measurement results of said second flow rate; providing information about said first flow rate and said second flow rate; and determining the sample volume based on differences between the first time delay at said first flow rate and the second time delay at said second flow rate.
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Specification