Filter unit for end-tidal carbon monoxide monitor
First Claim
1. A method of filtering a gas sample for use with a non-invasive end-tidal gas flow monitor containing a first sensor for detecting the amount of a first gas component in a gas sample, a second sensor for detecting the amount of a second gas component in the gas sample, a first connector in communication with the first sensor, a second connector in communication with the first sensor, a third connector in communication with the second sensor, comprising:
- providing a body having a first end and a second end and first, second, and third lumens extending through the body between the first and second ends;
providing a first consumable filtration medium for removing selected undesired components from the gas sample;
locating the first consumable filtration medium in one of the second and third lumens;
connecting the second and third lumens with a tube segment at one of the first and second ends, thereby providing the first lumen as a first gas flow path between the first and second ends of the body and providing the interconnected second lumen, tube segment, and third lumen as a second gas flow path through the body; and
passing said sample of gas through said first consumable filtration medium.
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Accused Products
Abstract
A noninvasive device and methods for measuring the end-tidal carbon monoxide concentration in a patient'"'"'s breath, particularly newborn and premature infants. The patient'"'"'s breath is monitored. An average carbon monoxide concentration is determined based on an average of discrete samples in a given time period. The ratio of the end-tidal portion of the breath flow sample is separately determined, preferably based on monitoring the level of carbon dioxide in the gas sample and identifying the carbon dioxide concentration levels corresponding to the end-tidal portion of the breath sample. The sensed carbon monoxide level is converted to the end-tidal carbon monoxide level by subtracting the ambient carbon monoxide level and dividing the remainder by the ratio of end-tidal breath to breath in the breath sample. An easy to use microcontroller-based device containing a carbon dioxide detector, a carbon monoxide detect and a pump for use in a hospital, home, physician'"'"'s office or clinic by persons not requiring high skill and training is described. A replaceable filter unit made of a single tri-lumen PVC extrusion and a tube segment inter-connecting two of the lumens used to provide the consumable filtration material. The filtration material is interposed between the carbon dioxide sensor and the carbon monoxide sensor which are mounted inside the monitor housing. The filter unit also interfaces the canula for receiving the patient'"'"'s breath sample and a hydrophobic filter between the patient and the carbon dioxide monitor.
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Citations
16 Claims
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1. A method of filtering a gas sample for use with a non-invasive end-tidal gas flow monitor containing a first sensor for detecting the amount of a first gas component in a gas sample, a second sensor for detecting the amount of a second gas component in the gas sample, a first connector in communication with the first sensor, a second connector in communication with the first sensor, a third connector in communication with the second sensor, comprising:
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providing a body having a first end and a second end and first, second, and third lumens extending through the body between the first and second ends; providing a first consumable filtration medium for removing selected undesired components from the gas sample; locating the first consumable filtration medium in one of the second and third lumens; connecting the second and third lumens with a tube segment at one of the first and second ends, thereby providing the first lumen as a first gas flow path between the first and second ends of the body and providing the interconnected second lumen, tube segment, and third lumen as a second gas flow path through the body; and passing said sample of gas through said first consumable filtration medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification