Carbon dioxide-sensing airway products and technique for using the same
First Claim
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1. A non-transitory computer readable medium with instructions embodied thereon for determining a change in a non-gas-exchanging physiologic volume in a ventilated patient comprising:
- code for receiving signals from a first carbon dioxide sensor disposed at a first location on a patient breathing circuit and a second carbon dioxide sensor disposed at a second location on the patient breathing circuit;
code for determining a concentration of carbon dioxide gas over time at the first location;
code for determining a concentration of carbon dioxide gas over time at the second location;
code for determining a velocity of the carbon dioxide gas between the first location and the second location; and
code for determining a change in physiological dead space, wherein the change in physiological dead space is determined based on a volume of the breathing circuit between the first location and the second location, the concentration of carbon dioxide gas at the first location and the second location, and the velocity of the carbon dioxide gas between the first location and the second location.
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Abstract
An airway device is provided that may track the flow of respiratory gases through the device with sensing elements at a plurality of locations along the gas flow path of the device. Such a device may be useful for assessing a variety of clinical states, for adjusting patient ventilator settings, or for determining whether or not an airway device has been properly inserted into a patient airway.
133 Citations
20 Claims
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1. A non-transitory computer readable medium with instructions embodied thereon for determining a change in a non-gas-exchanging physiologic volume in a ventilated patient comprising:
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code for receiving signals from a first carbon dioxide sensor disposed at a first location on a patient breathing circuit and a second carbon dioxide sensor disposed at a second location on the patient breathing circuit; code for determining a concentration of carbon dioxide gas over time at the first location; code for determining a concentration of carbon dioxide gas over time at the second location; code for determining a velocity of the carbon dioxide gas between the first location and the second location; and code for determining a change in physiological dead space, wherein the change in physiological dead space is determined based on a volume of the breathing circuit between the first location and the second location, the concentration of carbon dioxide gas at the first location and the second location, and the velocity of the carbon dioxide gas between the first location and the second location. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical system adapted to determine a change in a non-gas-exchanging physiologic volume in a ventilated patient comprising:
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a tracheal tube comprising a first carbon dioxide sensor disposed at a first location on the tracheal tube and a second carbon dioxide sensor disposed at a second location on the tracheal tube; and a processor adapted to; receive signals from the first carbon dioxide sensor and the second carbon dioxide sensor; determine a concentration of carbon dioxide gas over time at the first location; determine a concentration of carbon dioxide gas over time at the second location; determine a velocity of the carbon dioxide gas between the first location and the second location; and determine a change in physiological dead space, wherein the change in physiological dead space is determined based on a volume of the breathing circuit between the first location and the second location, the concentration of carbon dioxide gas at the first location and the second location, and the velocity of the carbon dioxide gas between the first location and the second location. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification