Positive airway pressure device with indirect calorimetry system
First Claim
1. A device for applying positive airway pressure to a patient and measuring the patient'"'"'s resting energy expenditure, the device comprising:
- a breathing circuit having a first end and a second end;
a patient interface device coupled to one of the first and second ends;
a bi-directional pump positioned within the breathing circuit between the first end and the second end; and
an indirect calorimetry module positioned within the breathing circuit, the indirect calorimetry module measuring the patient'"'"'s resting energy expenditure.
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Accused Products
Abstract
A device and method for applying positive airway pressure to a patient includes an indirect calorimetry system for measuring a patient'"'"'s resting energy expenditure (REE). The device includes a breathing circuit, one end of which includes a patient interface device such as a nasal face mask. A bi-directional pump is positioned within the breathing circuit. The bi-directional pump pumps gas in a first direction during the application of positive airway pressure. The bi-directional pump reverses direction when the device is in the indirect calorimetry mode. In this IC mode, patient'"'"'s expired gases are diluted and passed through an IC module containing an oxygen sensor, a carbon dioxide sensor, and a flow rate sensor. The device includes a microprocessor for calculating the patient'"'"'s REE based on the measured oxygen concentration, carbon dioxide concentration, and flow rate.
160 Citations
20 Claims
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1. A device for applying positive airway pressure to a patient and measuring the patient'"'"'s resting energy expenditure, the device comprising:
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a breathing circuit having a first end and a second end;
a patient interface device coupled to one of the first and second ends;
a bi-directional pump positioned within the breathing circuit between the first end and the second end; and
an indirect calorimetry module positioned within the breathing circuit, the indirect calorimetry module measuring the patient'"'"'s resting energy expenditure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of supplying positive airway pressure to a patient comprising the steps of:
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supplying a patient with positive airway pressure via a breathing circuit, the positive airway pressure providing for a flow of gas traveling through the breathing circuit in a first direction;
reversing in-line the flow of gas in the breathing circuit during one or more expiration breaths of a patient in a second direction;
monitoring a concentration of oxygen and a concentration of carbon dioxide in the breathing circuit during the one or more expiration breaths;
monitoring a flow rate of gas in the breathing circuit during the one or more expiration breaths; and
calculating a resting energy expenditure of the patient based on the concentration of oxygen, the concentration of carbon dioxide, and the flow rate within the breathing circuit. - View Dependent Claims (14, 15, 16)
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17. A method of supplying positive airway pressure to a patient comprising the steps of:
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supplying a patient with positive airway pressure via a breathing circuit, the positive airway pressure providing for a flow of gas traveling through the breathing circuit in a first direction;
reversing the flow of gas in the breathing circuit during one or more expiration breaths of a patient in a second direction;
wherein the flow of gas is reversed automatically by a device;
monitoring a concentration of oxygen and a concentration of carbon dioxide in the breathing circuit during the one or more expiration breaths;
monitoring a flow rate of gas in the breathing circuit during the one or more expiration breaths; and
calculating a resting energy expenditure of the patient based on the concentration of oxygen, the concentration of carbon dioxide, and the flow rate within the breathing circuit.
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18. A method of supplying positive airway pressure to a patient comprising the steps of:
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supplying a patient with positive airway pressure via a breathing circuit, the positive airway pressure providing for a flow of gas traveling through the breathing circuit in a first direction;
reversing the flow of gas in the breathing circuit during one or more expiration breaths of a patient in a second direction;
wherein the flow of gas is reversed manually;
monitoring a concentration of oxygen and a concentration of carbon dioxide in the breathing circuit during the one or more expiration breaths;
monitoring a flow rate of gas in the breathing circuit during the one or more expiration breaths; and
calculating a resting energy expenditure of the patient based on the concentration of oxygen, the concentration of carbon dioxide, and the flow rate within the breathing circuit.
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19. A method of supplying positive airway pressure to a patient comprising the steps of:
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supplying a patient with positive airway pressure via a breathing circuit, the positive airway pressure providing for a flow of gas traveling through the breathing circuit in a first direction;
reversing the flow of gas in the breathing circuit during one or more expiration breaths of a patient in a second direction;
wherein the flow of gas is reversed randomly;
monitoring a concentration of oxygen and a concentration of carbon dioxide in the breathing circuit during the one or more expiration breaths;
monitoring a flow rate of gas in the breathing circuit during the one or more expiration breaths; and
calculating a resting energy expenditure of the patient based on the concentration of oxygen, the concentration of carbon dioxide, and the flow rate within the breathing circuit.
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20. A device for applying positive airway pressure to a patient and measuring the patient'"'"'s resting energy expenditure, the device comprising:
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a breathing circuit, the breathing circuit having a patient interface device connected at one end and an inlet/exhaust port at the other end of the breathing circuit;
bi-directional pump positioned within the breathing circuit between the patient interface device and the inlet/exhaust port;
an indirect calorimetry module positioned within the breathing circuit and adjacent to the bi-directional pump, the indirect calorimetry module comprising an oxygen sensor, a carbon dioxide sensor, and a flow rate sensor; and
a microprocessor for calculating the patient'"'"'s resting energy expenditure based on a concentration of oxygen, a concentration or carbon dioxide, and a flow rate within breathing circuit.
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Specification