Sidestream gas sampling system with detachable sample cell
First Claim
1. A sidestream carbon dioxide gas sampling system, comprising:
- (1) a sampling tube having a first end and a second end and adapted to carry a sidestream flow of gas from a sampling site, wherein the sidestream flow of gas is a fraction of a total flow of gas exhaled from a user or inhaled by such a user;
(2) a sidestream carbon dioxide gas measurement assembly, including,(a) a housing,(b) a receptacle associated with the housing,(c) a radiation source disposed in the housing on a first side of the receptacle,(d) a radiation detector disposed in the housing on a second side of the receptacle, and(e) a pump disposed in the housing and adapted to draw the sidestream flow of gas into the sampling tube from the sampling site; and
(3) a sample cell coupled to the first end of the sampling tube, the sample cell including;
(a) a sample cell body,(b) a sample chamber defined in the sample cell body for receiving the sidestream flow of gas from such a user,(c) a first window defined in a first wall of the body and forming at least a portion of a boundary of the sample chamber, wherein the first window is disposed at a location on the sample cell body such that the first window is proximate to the radiation source responsive to the sample cell being disposed in the receptacle, and wherein the first window is substantially transparent to at least one wavelength of radiation to be used in determining a concentration of carbon dioxide disposed in the sample chamber, and(d) second window disposed in a second wall of the sample cell body at opposite sides of the sample chamber, wherein the second window is disposed at a location on the sample cell body such that the second window proximate to the radiation detector responsive to the sample cell being disposed in the receptacle, and wherein the second window is substantially transparent to at least one wavelength of radiation to be used in determining a concentration of carbon dioxide disposed in the sample chamber.
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0 Petitions
Accused Products
Abstract
A sidestream sampling system includes a sidestream gas measurement assembly and a sample cell configured to be assembled therewith. The sidestream gas measurement assembly includes a receptacle for removably receiving at least a portion of the sample cell. The sample cell is coupled to a sampling tube that is configured to communicate with an airway of an individual. When the sample cell is assembled with the sidestream gas measurement assembly, a window of the sample cell is oriented toward a corresponding source and/or detector of the sidestream gas measurement assembly to facilitate monitoring of an amount of at least one gas or vaporized material in an individual'"'"'s respiration.
47 Citations
12 Claims
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1. A sidestream carbon dioxide gas sampling system, comprising:
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(1) a sampling tube having a first end and a second end and adapted to carry a sidestream flow of gas from a sampling site, wherein the sidestream flow of gas is a fraction of a total flow of gas exhaled from a user or inhaled by such a user; (2) a sidestream carbon dioxide gas measurement assembly, including, (a) a housing, (b) a receptacle associated with the housing, (c) a radiation source disposed in the housing on a first side of the receptacle, (d) a radiation detector disposed in the housing on a second side of the receptacle, and (e) a pump disposed in the housing and adapted to draw the sidestream flow of gas into the sampling tube from the sampling site; and (3) a sample cell coupled to the first end of the sampling tube, the sample cell including; (a) a sample cell body, (b) a sample chamber defined in the sample cell body for receiving the sidestream flow of gas from such a user, (c) a first window defined in a first wall of the body and forming at least a portion of a boundary of the sample chamber, wherein the first window is disposed at a location on the sample cell body such that the first window is proximate to the radiation source responsive to the sample cell being disposed in the receptacle, and wherein the first window is substantially transparent to at least one wavelength of radiation to be used in determining a concentration of carbon dioxide disposed in the sample chamber, and (d) second window disposed in a second wall of the sample cell body at opposite sides of the sample chamber, wherein the second window is disposed at a location on the sample cell body such that the second window proximate to the radiation detector responsive to the sample cell being disposed in the receptacle, and wherein the second window is substantially transparent to at least one wavelength of radiation to be used in determining a concentration of carbon dioxide disposed in the sample chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of sidestream carbon dioxide analysis, comprising:
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(a) placing a sampling tube in fluid communication with an airway of a patient, wherein the sampling tube is in fluid communication with a sample cell, wherein the sample cell comprises; (1) a sample cell body, (2) a sample chamber defined in the sample cell body, (3) a first window defined in a first wall of the body and forming at least a portion of a boundary of the sample chamber, wherein the first window is substantially transparent to at least one wavelength of radiation to be used in determining a concentration of carbon dioxide disposed in the sample chamber, and (4) second window disposed in a second wall of the sample cell body at opposite sides of the sample chamber, wherein the second window is substantially transparent to at least one wavelength of radiation to be used in determining a concentration carbon dioxide disposed in the sample chamber; (b) carrying a sidestream flow of gas via the sampling tube from a sampling site, wherein the sidestream flow of gas is a fraction of a total flow of gas exhaled from a user or inhaled by such a user; (c) providing a sidestream carbon dioxide measurement assembly comprising; (1) a housing, (2) a receptacle associated with the housing, (3) a radiation source disposed in the housing on a first side of the receptacle, (4) a radiation detector disposed in the housing on a second side of the receptacle, and (5) a pump disposed in the housing and adapted to draw the sidestream flow of gas into the sampling tube from the sampling site; (d) attaching the sample cell to the sidestream carbon dioxide measurement assembly by inserting at least a portion of the sample cell body into the receptacle such that the first window is proximate to the radiation source and the second window is proximate to the radiation detector; (e) drawing the sidestream flow of gas into the sampling tube via the pump; and (f) analyzing the sidestream flow of gas using the sidestream carbon dioxide measurement assembly. - View Dependent Claims (10, 11, 12)
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Specification