DEVICE,GAS MIXTURE AND METHOD FOR LUNG DIAGNOSIS
First Claim
Patent Images
1. A device (10) for determining the ventilation homogeneity (VH) of a spontaneously breathing or artificially respirated patient (P), characterized in that it comprises:
- at least one source (11) for a breathable test gas mix having essentially the same molecular mass sum (MMS) as ambient air (AA) or as a reference gas mix from a second source (112), but which differs from the ambient air (AA) or the reference gas mix from the second source (112) by addition of at least one specifically lighter inert gas (I1) and at least one specifically heavier inert gas (I2), andat least one unit (12) for determining the molecular mass sums (MMS) of the gas mixtures exhaled by the patient.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a lung diagnostic device, namely one for determining the ventilation homogeneity (VH) of a spontaneously breathing or artificially respirated patient as well as a gas mix for use in such a device. In this respect the difference in the composition of the exhaled test gas from the composition of the inhaled test gas serves for the evaluation of the ventilation homogeneity.
33 Citations
24 Claims
-
1. A device (10) for determining the ventilation homogeneity (VH) of a spontaneously breathing or artificially respirated patient (P), characterized in that it comprises:
-
at least one source (11) for a breathable test gas mix having essentially the same molecular mass sum (MMS) as ambient air (AA) or as a reference gas mix from a second source (112), but which differs from the ambient air (AA) or the reference gas mix from the second source (112) by addition of at least one specifically lighter inert gas (I1) and at least one specifically heavier inert gas (I2), and at least one unit (12) for determining the molecular mass sums (MMS) of the gas mixtures exhaled by the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16)
-
- 11. A test gas mix for determining the ventilation homogeneity (VH) of a spontaneously breathing or artificially respirated patient, characterized in that the test gas mix is a breathable gas mix, which has essentially the same molecular mass sum (MMS) as ambient air (AA) or a reference gas mix, but differs from these by at least one added specifically heavier gas (I2).
-
17. A method for determining the ventilation homogeneity (VH) of a spontaneously breathing or artificially respirated patient (P), characterized in that the patient:
inhales actively or passively and in a controlled manner a breathable test gas mix, which essentially has the same molecular weight sum (MMS) as ambient air or a reference gas mix, but differs from both by addition of at least one specifically heavier inert gas (I2) and a sufficient proportion of a specifically lighter gas (I1), in order to adjust the molecular mass sum of the test gas to the about same value of the molecular mass sum of ambient air or the reference gas, and that the molecular mass sum (MMS) of the test gas exhaled by the patient is determined in order to evaluate the ventilation homogeneity of the patient from the differences in the test gas mix inhaled and exhaled by the patient. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
Specification