Breath gas analysis systems and methods
AssigneeVyaire Medical, Inc.
InventorJuergen Reinstaedtler
Life of this patent
Estimating the term…
Abstract
Devices and methods are provided for breath gas analysis when determining the difference in the concentrations of at least one gas in the exhaled breathing air on the one hand and in the ambient air on the other hand. The device may include at least one gas sensor, by means of which the concentration of a gas can be determined, and a line system, through whose lines the exhaled air to be examined, the ambient air and a calibrating gas can be selectively pumped to the gas sensor. The method may include feeding ambient air; feeding calibrating gas to the gas sensor; feeding exhaled air to the gas sensor; feeding calibrating gas to the gas sensor again; and feeding exhaled air to the gas sensor again.
Claims20
A method of breath gas analysis, comprising:
- determining, by at least one gas sensor of a device for breath gas analysis, a first gas concentration in ambient air received from a first intake of the device through a first line path between the first intake and the at least one gas sensor;
- determining an ambient air reference value based on the first gas concentration;
- determining, by the at least one gas sensor, a second gas concentration in a calibrating gas received from a second intake of the device through a second line path between the second intake and the first line path, the second line path comprising a valve configured to selectively provide the calibration gas to displace ambient air along the first line path;
- determining a calibrating gas reference value based on the second gas concentration;
- determining, by the at least one gas sensor, a third gas concentration in exhaled air received through the first line path from the first intake;
- determining a measured value based on the third gas concentration;
- determining, by the at least one gas sensor, a fourth gas concentration in additional calibrating gas received through the second line path from the second intake;
- determining a correction value based on a difference between the fourth gas concentration and the calibration gas reference value;
- determining a corrected ambient air reference value based on the correction value;
- determining, by the at least one gas sensor, a fifth gas concentration in additional exhaled air received through the first line path from the first intake;
- and
- performing a breath gas analysis of the fifth gas concentration using the corrected ambient air reference value.
Dependencies are inferred from the claim text.