Methods and systems for quantitative colorimetric capnometry
First Claim
1. A quantitative colorimetric carbon dioxide detection and measurement system comprising:
- a gas conduit;
a colorimetric indicator adapted to exhibit a color change in response to exposure to carbon dioxide gas;
a temperature sensor configured to measure a temperature of the colorimetric indicator;
an electro-optical sensor assembly comprising a light source or sources adapted to transmit light to the colorimetric indicator, and a light detection element configured to detect light reflected from the colorimetric indicator and to generate a measurement signal;
a processor in communication with the electro-optical sensor assembly, the processor configured to;
receive the measurement signal generated by the electro-optical sensor assembly and the temperature of the colorimetric indicator, andcompute a concentration of carbon dioxide based on the measurement signal and the temperature of the colorimetric indicator; and
a device configured to electronically receive the computed carbon dioxide concentration and execute a breathing therapy program comprising a set of tone patterns adapted for guiding a user'"'"'s breathing technique to modulate the carbon dioxide to a level between about 37 mmHg and 43 mmHg.
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Abstract
Quantitative colorimetric carbon dioxide detection and measurement systems are disclosed. The systems can include a gas conduit, a colorimetric indicator adapted to exhibit a color change in response to exposure to carbon dioxide gas, a temperature controller operatively coupled to the colorimetric indicator and configured to control the temperature of the colorimetric indicator, an electro-optical sensor assembly including a light source or sources adapted to transmit light to the colorimetric indicator, and a photodiode or photodiodes configured to detect light reflected from the colorimetric indicator and to generate a measurement signal, and a processor in communication with the electro-optical sensor assembly. The processor can be configured to receive the measurement signal generated by the electro-optical sensor assembly and to compute a concentration of carbon dioxide based on the measurement signal. Methods for using the systems are also disclosed including providing a breathing therapy to a patient or user.
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Citations
62 Claims
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1. A quantitative colorimetric carbon dioxide detection and measurement system comprising:
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a gas conduit; a colorimetric indicator adapted to exhibit a color change in response to exposure to carbon dioxide gas; a temperature sensor configured to measure a temperature of the colorimetric indicator; an electro-optical sensor assembly comprising a light source or sources adapted to transmit light to the colorimetric indicator, and a light detection element configured to detect light reflected from the colorimetric indicator and to generate a measurement signal; a processor in communication with the electro-optical sensor assembly, the processor configured to; receive the measurement signal generated by the electro-optical sensor assembly and the temperature of the colorimetric indicator, and compute a concentration of carbon dioxide based on the measurement signal and the temperature of the colorimetric indicator; and a device configured to electronically receive the computed carbon dioxide concentration and execute a breathing therapy program comprising a set of tone patterns adapted for guiding a user'"'"'s breathing technique to modulate the carbon dioxide to a level between about 37 mmHg and 43 mmHg. - 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, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A quantitative colorimetric carbon dioxide detection system comprising:
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a colorimetric indicator adapted to change color in response to exposure to a quantity of carbon dioxide gas; a temperature sensor configured to measure a temperature of the colorimetric indicator; an electro-optical sensor assembly coupled to the colorimetric indicator, the electro-optical sensor assembly comprising light sources adapted to transmit a first wavelength and a second wavelength to the colorimetric indicator, wherein the first wavelength is configured to be sensitive to an indicator color change and the second wavelength is configured to not be as sensitive to an indicator color change, and a light detection element configured to detect a first reflected light based on the first wavelength and a second reflected light based on the second wavelength, and to generate a first electrical signal based on the first reflected light and a second electrical signal based on the second reflected light; a processor in communication with the electro-optical sensor assembly and temperature sensor, the processor configured to receive the electrical signals generated by the electro-optical sensor assembly to compute the concentration of carbon dioxide exposed to the indicator; and a device configured to electronically receive the computed carbon dioxide concentration and execute a breathing therapy program comprising a set of tone patterns adapted for guiding a user'"'"'s breathing technique to modulate the carbon dioxide to a level between about 37 mmHg and 43 mmHg. - View Dependent Claims (41, 42)
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43. A method for quantitatively measuring carbon dioxide, the method comprising:
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passing a sample gas through a gas conduit; contacting a colorimetric indicator with the sample gas, the colorimetric indicator adapted to exhibit a color change in response to exposure to carbon dioxide gas; measuring a temperature of the colorimetric indicator with a temperature sensor while contacting the colorimetric indicator with the sample gas; transmitting light to the colorimetric indicator with an electro-optical sensor assembly comprising a light source or sources while contacting the colorimetric indicator with the sample gas; detecting light reflected from the colorimetric indicator with a light detection element; generating a measurement signal from the light detection element based on the reflected light; sending the measurement signal to a processor; computing the concentration of carbon dioxide in the sample gas with the processor based on the measurement signal and the temperature of the colorimetric indicator; and executing a breathing therapy program comprising a set of tone patterns adapted for guiding a user'"'"'s breathing technique to modulate the carbon dioxide to a level between about 37 mmHg and 43 mmHg. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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Specification