Method of respiratory gas analysis using a metabolic calorimeter
First Claim
1. A method of determining a respiratory parameter for a subject using an indirect calorimeter, comprising:
- initializing the indirect calorimeter, wherein the indirect calorimeter includes a respiratory connector for passing inhaled and exhaled gases as the subject breathes, a flow pathway operable to receive and pass the inhaled and exhaled gases and having a flow tube within the flow pathway through which the inhaled and exhaled gases pass, a flow meter, a component gas concentration sensor, and a computation unit having a processor and a memory;
passing the inhaled and exhaled gases through the respiratory connector, if the indirect calorimeter is initialized;
sensing a flow volume of the inhaled and exhaled gases passing through the flow pathway, using the flow meter, and transmitting a signal representing the sensed flow volume to the computation unit;
sensing a concentration of a predetermined component gas in at least one of the inhaled and exhaled gases passing through the flow pathway, using the component gas concentration sensor, and transmitting a signal representing the sensed concentration to the computation unit;
determining if the subject'"'"'s breathing has reached steady state;
calculating at least one respiratory parameter for the subject at steady state using the sensed flow volume and the sensed concentration; and
providing the at least one respiratory parameter to the subject.
3 Assignments
0 Petitions
Accused Products
Abstract
A method of determining a respiratory parameter for a subject using an indirect calorimeter is provided. The indirect calorimeter includes a respiratory connector for passing inhaled and exhaled gases, a flow pathway operable to receive and pass inhaled and exhaled gases having a flow tube within the flow pathway through which the inhaled and exhaled gases pass, a flow meter for determining an instantaneous flow volume of the inhaled and exhaled gases, a component gas concentration sensor for determining an instantaneous fraction of a predetermined component gas and a computation unit having a processor and a memory. The method includes the steps of initializing the indirect calorimeter and the subject breathing into the respiratory connector if the indirect calorimeter is initialized, sensing the flow volume of the inhaled and exhaled gases passing through the flow pathway using the flow meter and transmitting a signal representing the sensed flow volume to the computation unit. The method also includes the steps of sensing a concentration of a predetermined component gas as the inhaled and exhaled gases pass through the flow pathway using the component gas sensor, and transmitting a signal representing the sensed concentration of the predetermined component gas to the computation unit. The method further includes the steps of calculating at least one respiratory parameter for the subject as the subject breathes through the calorimeter using the sensed flow volume and the sensed concentration of the predetermined component gas, and providing the subject with the at least one respiratory parameter.
251 Citations
63 Claims
-
1. A method of determining a respiratory parameter for a subject using an indirect calorimeter, comprising:
-
initializing the indirect calorimeter, wherein the indirect calorimeter includes a respiratory connector for passing inhaled and exhaled gases as the subject breathes, a flow pathway operable to receive and pass the inhaled and exhaled gases and having a flow tube within the flow pathway through which the inhaled and exhaled gases pass, a flow meter, a component gas concentration sensor, and a computation unit having a processor and a memory;
passing the inhaled and exhaled gases through the respiratory connector, if the indirect calorimeter is initialized;
sensing a flow volume of the inhaled and exhaled gases passing through the flow pathway, using the flow meter, and transmitting a signal representing the sensed flow volume to the computation unit;
sensing a concentration of a predetermined component gas in at least one of the inhaled and exhaled gases passing through the flow pathway, using the component gas concentration sensor, and transmitting a signal representing the sensed concentration to the computation unit;
determining if the subject'"'"'s breathing has reached steady state;
calculating at least one respiratory parameter for the subject at steady state using the sensed flow volume and the sensed concentration; and
providing the at least one respiratory parameter to the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. A method of determining a respiratory parameter for a subject using an indirect calorimeter, comprising:
-
initializing the indirect calorimeter, wherein the indirect calorimeter includes a respiratory connector for passing inhaled and exhaled gases as the subject breathes, a flow pathway operable to receive and pass the inhaled and exhaled gases and having a flow tube within the flow pathway through which the inhaled and exhaled gases pass, a flow meter, a component gas concentration sensor, and a computation unit having a processor and a memory;
passing the inhaled and exhaled gases through the respiratory connector after the indirect calorimeter is initialized;
sensing an instantaneous flow volume of the inhaled and exhaled gases passing through the flow pathway, using the flow meter, and transmitting a signal representing the sensed instantaneous flow volume to the computation unit;
sensing an instantaneous concentration of a predetermined component gas in at least one of the inhaled and exhaled gases passing through the flow pathway, using the component gas concentration sensor, and transmitting a signal representing the sensed instantaneous concentration to the computation unit;
calculating an instantaneous metabolic rate for the subject as the subject breathes through the indirect calorimeter using the sensed instantaneous flow volume and the sensed instantaneous concentration;
determining if the instantaneous metabolic rate has reached steady state;
determining a resting metabolic rate if the instantaneous metabolic rate has reached steady state; and
providing the resting metabolic rate to the subject. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
-
-
51. A method of determining a respiratory parameter for a subject using an indirect calorimeter, comprising:
-
initializing the indirect calorimeter, wherein the indirect calorimeter includes a respiratory connector for passing inhaled and exhaled gases as the subject breathes, a flow pathway operable to receive and pass the inhaled and exhaled gases and having a flow tube within the flow pathway through which the inhaled and exhaled gases pass, a flow meter, an oxygen sensor, a carbon dioxide sensor, and a computation unit having a processor and a memory;
passing the inhaled and exhaled gases through the respiratory connector, if the indirect calorimeter is initialized;
sensing a flow volume of the inhaled and exhaled gases passing through the flow pathway, using the flow meter, and transmitting a signal representing the sensed flow volume to the computation unit;
sensing a concentration of oxygen in at least one of the inhaled and exhaled gases passing through the flow pathway, using the oxygen sensor, and transmitting a signal representing the sensed concentration of oxygen to the computation unit;
sensing a concentration of carbon dioxide in at least one of the inhaled and exhaled gases passing through the flow pathway, using the carbon dioxide sensor, and transmitting a signal representing the sensed concentration of carbon dioxide to the computation unit;
calculating at least one respiratory parameter for the subject as the subject breathes through the indirect calorimeter using the sensed flow volume, the sensed concentration of oxygen, and the sensed concentration of carbon dioxide;
determining if the subject'"'"'s breathing has reached steady state; and
providing the at least one respiratory parameter to the subject after the subject'"'"'s breathing has reached steady state. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
-
Specification