US20190076056A1 - Breath end-tidal gas monitor - Google Patents
Breath end-tidal gas monitor Download PDFInfo
- Publication number
- US20190076056A1 US20190076056A1 US15/947,436 US201815947436A US2019076056A1 US 20190076056 A1 US20190076056 A1 US 20190076056A1 US 201815947436 A US201815947436 A US 201815947436A US 2019076056 A1 US2019076056 A1 US 2019076056A1
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- air
- flow
- sample volume
- selector valve
- exhalation
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- 238000005259 measurement Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 210000002345 respiratory system Anatomy 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 claims 2
- 230000003247 decreasing effect Effects 0.000 claims 2
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000004458 analytical method Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 90
- 239000003570 air Substances 0.000 description 64
- 230000000737 periodic effect Effects 0.000 description 20
- 238000004590 computer program Methods 0.000 description 5
- 239000012080 ambient air Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000008280 blood Substances 0.000 description 3
- 210000004369 blood Anatomy 0.000 description 3
- 238000004868 gas analysis Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/097—Devices for facilitating collection of breath or for directing breath into or through measuring devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/082—Evaluation by breath analysis, e.g. determination of the chemical composition of exhaled breath
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/083—Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/083—Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
- A61B5/0833—Measuring rate of oxygen consumption
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/083—Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
- A61B5/0836—Measuring rate of CO2 production
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/087—Measuring breath flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/497—Physical analysis of biological material of gaseous biological material, e.g. breath
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S436/00—Chemistry: analytical and immunological testing
- Y10S436/90—Breath testing
Definitions
- the present invention is related to gas analyzer systems, and in particular, to an improved gas analyzer system configured to obtain accurate gas analysis measurements of the a selected portion of a periodic gas pattern, such as the end-tidal portion of an exhalation from a test subject.
- Conventional breath analyzer devices obtain a number of measurements of gas concentrations in a patient's breath over a predetermined period of time. These measurements are utilized in a mathematical curve-fitting analysis which subsequently provides an approximate measurement of the gas concentrations for discrete portions of the patients breath, including the end-tidal portion.
- the present invention is configured to acquire a selected sample of a time-varying or periodic gas pattern.
- a gas intake is routed to a detector configured to continually monitor the time-varying or periodic element of the gas pattern.
- Output gas from the detector is directed to a branch.
- the branch configured to direct the flow of gas either into a sample volume contained between first and second flow selector valves, or to bypass the sample volume and directly enter a third flow selector valve.
- An air pump is operatively coupled to the third flow selector valve to draw gas through the system from the gas intake, and to force the gas through a fourth flow selector valve where it is either exhausted from the system or redirected back to the sample volume.
- a gas output from the first flow selector valve is configured to exhaust air from the sample volume through one or more gas analyzer.
- the present invention is configured to acquire a sample of exhaled air from an end-tidal portion of a patient's exhalation.
- a pair of air intakes are routed to a first flow selector valve.
- One of the pair of air intakes is configured to receive an exhalation from a patient or test subject, and preferably consists of a cannula adapted for tracheal or nasal insertion.
- the second air intake is configured to receive a supply of ambient air for diagnostic and calibration purposes.
- the second air intake preferably includes a CO 2 scrubber adapted to reduce the level of CO 2 present in the ambient air as it is drawn there through.
- Air output from the first flow selector valve is routed to a capnograph configured to continually monitor the level of CO 2 present.
- Output air from the capnograph is directed to the input of a second flow selector valve.
- the second flow selector valve is configured to direct the flow of air either into a sample volume contained between third and fourth flow selector valves, or to bypass the sealable sample volume and directly enter the fourth flow selector valve.
- An air pump is operatively coupled to the fourth flow selector valve to draw air through the system from either of the pair of air intakes, and to force the air through a fifth flow selector valve where it is either exhausted from the system or redirected back to the sealable sample volume.
- An air output from the third flow selector valve is configured to exhaust air from the sample volume through a gas analyzer.
- a method of the present invention for capturing and analyzing a select portion of an periodic or time-varying gas patterns involves monitoring the periodic element of gas drawn into the system. Upon detection of a level of the periodic element in the gas drawn into the system reaching a predetermined threshold, a flow selector valve is operated to isolate a volume of air drawn into the system immediately prior to the detection of the threshold level. Incoming gas is diverted around the captured volume of gas, and the periodic element threshold levels are continually monitored to ensure that the captured volume of gas corresponds to the desired portion of the periodic or time-varying gas pattern. Once the captured volume of gas is positively identified as the desired portion, the captured volume is routed through one or more gas analyzers for analysis of one or more predetermined gas levels.
- An alternate method of the present invention for capturing and analyzing the end-tidal portion of an exhalation involves monitoring the CO 2 level of air drawn into the system As the monitored CO 2 level increases, it is known that the patient is exhaling. Upon detection of a decrease in the CO 2 level in the air drawn into the system, a pair of flow selector valves are operated to capture the volume of air drawn into the system immediately prior to the detection of the decrease in the CO 2 level. Incoming air is diverted around the captured volume of air, and the CO 2 levels are continually monitored to ensure that the captured volume of air corresponds to the end-tidal portion of an exhalation. Once the captured volume of air is positively identified as the end-tidal portion of an exhalation, the captured volume is routed through one or more gas analyzers for analysis of one or more predetermined gas levels.
- FIG. 1 is a simplified component diagram of the periodic gas analyzer of the present invention
- FIG. 2 is a simplified component diagram of a breath analyzer of the present invention, with flow selector valves configured for breath pass-through;
- FIG. 3 is the breath analyzer of FIG. 2 , with the flow selector valves configured for breath sample isolation;
- FIG. 4 is the breath analyzer of FIG. 2 , with the flow selector valves configured for breath sample analysis.
- a time-varying or periodic gas analyzer of the present invention is shown generally at 10 .
- a pump 12 is operated to draw air into the apparatus 10 through a gas intake 14 operatively placed to receive gas from a time-varying or periodic gas pattern.
- Interconnecting tubing 16 routes the received gas to a detector 22 .
- the detector 22 is further configured to continually monitor the level of a periodic gas element or component present in the input airflow, and to provide one or more associated output signals representative of the level reaching a predetermined threshold.
- These associated output signals may include, but are not limited to, a measure of the periodic gas element or component present in the input airflow, an indication of an increase in the measure of the periodic gas element or component present in the input airflow, or an indication of a decrease in the measure of the periodic gas element or component present in the input airflow.
- a “T” branch 24 and a series of flow selector valves 26 and 28 and associated interconnecting tubing define a sample volume 30 disposed between flow selector valves 26 and 28 , and a bypass pathway 32 disposed between the “T” branch 24 and the flow selector valve 28 .
- the “T” branch 24 is configured to receive an output airflow from the detector 22 and to direct the output airflow through flow selector valve 26 into the sample volume 30 , or into the bypass pathway 32 to flow selector valve 28 .
- Airflow exiting flow selector valve 28 is drawn through the pump 12 and routed to a flow selector valve 34 .
- a pressure sensor 36 is operatively coupled to the air pathway between the pump 12 and the flow selector valve 34 .
- Pressure sensor 36 is configured to monitor the air flow pressure level between the pump 12 and the flow selector valve 34 , and to provide a warning in the event the monitored pressure level falls outside a predetermined range.
- Flow selector valve 34 is configured to selectively direct an output airflow to either an exhaust port 38 , or to the sample volume 30 .
- Flow selector valve 26 is configured to selectively isolate the sample volume 30 from the input airflow received from the “T” branch 24 , and to selectively couple the sample volume 30 to an exhaust port 42 through at least one gas analyzer 44 .
- a suitably configured control circuit such as a logic circuit, a microprocessor, or a general purpose computer (not shown) may be used to control the individual flow selector valves 26 , 28 , and 34 , responsive to the output of the detector 22 .
- the control circuit may be operatively coupled to the at least one gas analyzer 44 to provide an operator with one or more output representation of the gas analysis results and operation of the apparatus 10 .
- Programming of a suitable control circuit to operate the above described components and to carry out the method of the present invention is considered to be routine to those of ordinary skill in the art of computer programming, and is not addressed further herein.
- a method of the present invention for capturing and analyzing a select portion of a time-varying or periodic gas pattern involves monitoring the level of a periodic element or gas component in gas drawn into the apparatus 10 through the gas intake 14 .
- the level of the periodic element or gas component is monitored using the detector 22 , and is drawn in through the gas intake 14 and detector 22 by the pump 12 .
- the airflow passes through the “T” branch 24 , and into the sample volume 30 contained between flow selector valves 26 and 28 . As the airflow exits the sample volume 30 through flow selector valve 28 , it is drawn through the pump 12 and propelled through flow selector valve 34 to exit the apparatus 10 through the exhaust port 38 .
- flow selector valves 26 and 28 are closed to capture, in the sample volume 30 , the volume of air which was drawn into the apparatus 10 immediately prior to the detection of the threshold level by the detector 22 .
- Subsequent incoming gas flow drawn into the apparatus 10 by the pump 12 is diverted through the bypass pathway 32 at the “T” branch 24 .
- the bypass pathway 32 is routed around the sample volume 30 , permitting a continued draw of gas through the apparatus 10 .
- the threshold levels of the continued draw of gas through the apparatus 10 are monitored by the detector 22 to ensure that the gas isolated within the sample volume 30 corresponds to the desired portion of an gas pattern, i.e. that the threshold levels of the gas drawn into the apparatus 10 satisfy a predetermined set of criteria, for example, that they are maintained for a predetermined period of time.
- the captured volume is exhausted from the apparatus 10 through one or more gas analyzers 44 for analysis of one or more predetermined gas levels.
- the flow selector valve 34 is operated to divert the incoming air flow from the exhaust port 38 and instead, route the incoming gas flow into the sample volume 30 .
- the flow selector valve 26 is operated to open a pathway for gas flow to exhaust port 42 through the one or more gas analyzers 44 .
- each gas analyzer 44 is selectively operated to sample the gas flow only for that portion of the gas flow which corresponds to the volume originally captured in the sample volume 30 which corresponds to the desired portion of the gas pattern.
- FIG. 2 a modification of the basic apparatus 10 shown in FIG. 1 , particularly adapted for collecting and analyzing end tidal breath exhalations is shown generally at 100 .
- a pump 12 is operated to draw air into the apparatus 10 through either a cannula 114 operatively placed to receive air from a patient's lungs, or a calibration air intake 116 .
- the calibration air intake 116 is operatively placed to receive ambient air, and includes a CO 2 scrubber 118 configured to reduce the level of CO 2 in the ambient air drawn through the calibration air intake 116 .
- a flow selector valve 120 is configured to receive airflow from both the cannula 114 and the calibration air intake 116 , and to select either the cannula 114 or the calibration air intake 116 to provide an input airflow to the apparatus 100 .
- a capnograph 122 is configured to receive the input airflow to the apparatus 100 .
- the capnograph 122 is further configured to continually monitor the level of CO 2 present in the input airflow, and to provide one or more associated output signals.
- These associated output signals may include, but are not limited to, a measure of the CO 2 present in the input airflow, an indication of an increase in the measure of the CO 2 present in the input airflow, or an indication of a decrease in the measure of the CO 2 present in the input airflow.
- the flow selector valve 120 is configured to draw ambient room air into the apparatus 100 through the calibration air intake 16 and past the CO 2 scrubber 118 .
- the CO 2 scrubber 118 the amount of CO 2 present in the drawn in ambient room air is reduced to a predetermined level, which is subsequently measured by the capnograph 122 . Any discrepancy between the capnograph 122 CO 2 measurement and the predetermined level is an indication that the apparatus 100 may require calibration.
- a flow selector valve 124 Downstream from the capnograph 122 , a flow selector valve 124 optionally replaces “T” branch 24 , to provide, with flow selector valves 26 and 28 and associated interconnecting tubing, a sample volume 30 disposed between flow selector valves 26 and 28 , and a bypass pathway 32 disposed between flow selector valves 124 and 28 .
- Flow selector valve 124 is configured to receive an output airflow from the capnograph 122 and to selectively direct the output airflow either through flow selector valve 26 into the sample volume 30 , or into the bypass pathway 32 to flow selector valve 28 .
- Airflow exiting flow selector valve 28 is drawn through the pump 12 and routed to a flow selector valve 34 .
- a pressure sensor 36 is operatively coupled to the air pathway between the pump 12 and the flow selector valve 34 .
- Pressure sensor 36 is configured to monitor the air flow pressure level between the pump 12 and the flow selector valve 34 , and to provide a warning in the event the monitored pressure level falls outside a predetermined range.
- Flow selector valve 34 is configured to selectively direct an output airflow to either an exhaust port 38 , or to the sample volume 30 through an optional one-way valve 140 .
- One-way valve 140 is operatively disposed in the sample volume 30 adjacent the flow selector valve 28 , such that an airflow entering the sample volume 30 through the one-way valve 140 will flow in the opposite direction to an airflow entering the sample volume through the flow selector valve 26 .
- Flow selector valve 26 is configured to selectively isolate the sample volume 30 from the input airflow received from the flow selector valve 124 , and to selectively couple the sample volume 30 to an exhaust port 42 through at least one gas analyzer 44 .
- the at least one gas analyzer 44 includes a CO sensor configured to measure the level of CO in the airflow passing there through.
- the at least one gas analyzer 44 includes an O 2 sensor configured to measure the level of O 2 in the airflow passing there through.
- a suitably configured control circuit such as a logic circuit, a microprocessor, or a general purpose computer (not shown) may be used to control the individual flow selector valves 120 , 124 , 26 , 28 , and 34 , responsive to the output of the capnograph 122 .
- the control circuit may be operatively coupled to the at least one gas analyzer 44 to provide an operator with one or more output representation of the breath gas analysis results and operation of the apparatus 100 .
- Programming of a suitable control circuit to operate the above described components and to carry out the method of the present invention is considered to be routine to those of ordinary skill in the art of computer programming, and is not addressed further herein.
- a method of the present invention for capturing and analyzing the end-tidal portion of an exhalation involves monitoring the CO 2 level of aspirated breath air drawn from a patient's respiratory system into the apparatus 100 through the cannula 114 .
- the CO 2 level of the incoming air is monitored using the capnograph 122 .
- Normal breath airflow through the apparatus 100 is drawn in through the cannula 114 and capnograph 122 by the pump 12 .
- the airflow passes through the flow selector valve 124 , and into the sample volume 30 contained between flow selector valves 26 and 28 .
- As the airflow exits the sample volume 30 through flow selector valve 28 it is drawn through the pump 12 and propelled through flow selector valve 34 to exit the apparatus 100 through the exhaust port 38 .
- a flow selector valves 26 and 28 are closed, as shown in FIG. 3 , to capture, in the sample volume 30 , the volume of air which was drawn into the apparatus 100 immediately prior to the detection of the decrease in the CO 2 level by the capnograph 122 .
- Subsequent incoming air flow drawn into the apparatus 100 by the pump 12 is diverted through the bypass pathway 32 by the flow selector valve 124 .
- the bypass pathway 32 is routed around the sample volume 30 , permitting a continued draw of air through the apparatus 100 .
- the CO 2 levels of the continued draw of air through the apparatus 100 are monitored by the capnograph 122 to ensure that the air isolated within the sample volume 30 corresponds to the end-tidal portion of an exhalation, i.e. that the CO 2 levels of the air drawn into the apparatus 100 continue to decrease for a predetermined period of time at a predetermined rate of decrease.
- the captured volume is exhausted from the apparatus 100 through one or more gas analyzers for analysis of one or more predetermined gas levels.
- the flow selector valve 34 is operated to divert the incoming air flow from the exhaust port 38 and instead, route the incoming air flow into the sample volume 30 through the optional one-way valve 140 .
- the flow selector valve 26 is operated to open a pathway for airflow to exhaust port 42 through the one or more gas analyzers 44 .
- the operative position of the one-way valve 140 in relation to the flow selector valve 26 causes the incoming air flow from the one-way valve 140 to drive the volume of air contained within the sample volume 30 through the flow selector valve 26 and through the one or more gas analyzers 44 .
- the flow rate of the incoming air flow passing through one-way valve 140 into the sample volume 30 is known. Accordingly, the flow rate of the volume of air past the one or more gas analyzers 44 is known.
- Each gas analyzers 44 is selectively operated to sample the air flow only for that portion of the air flow which corresponds to the volume originally captured in the sample volume 30 which corresponds to the end-tidal portion of a patient's breath.
- at least one gas analyzer 44 measures a level of CO present in the air flow passing there through.
- a gas analyzer measures a level of O 2 present in the air flow.
- the present invention can be embodied in-part the form of computer-implemented processes and apparatuses for practicing those processes.
- the present invention can also be embodied in the form of computer program code containing instructions embodied in-part in tangible media, such as floppy diskettes, CD-ROMs, hard drives, or an other computer readable storage medium, wherein, when the computer program code is loaded into, and executed by, an electronic device such as a computer, micro-processor or logic circuit, the device becomes an apparatus for practicing the invention.
- the present invention can also be embodied in-part the form of computer program code, for example, whether stored in a storage medium, loaded into and/or executed by a computer, or transmitted over some transmission medium, such as over electrical wiring or cabling, through fiber optics, or via electromagnetic radiation, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus for practicing the invention.
- the computer program code segments configure the microprocessor to create specific logic circuits.
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Abstract
Description
- The present invention is related to gas analyzer systems, and in particular, to an improved gas analyzer system configured to obtain accurate gas analysis measurements of the a selected portion of a periodic gas pattern, such as the end-tidal portion of an exhalation from a test subject.
- Often, there is the need to obtain measurements of the proportions and levels of gases present in a periodic or time-varying gas pattern, such as the breath of a patient. Analysis of the gases present in the breath of a patient is commonly utilized as a non-invasive procedure for obtaining a representation of the proportions and levels of gases in the patient's blood. It is known that air in the deep alveolar pockets of a patients lungs is composed of a mixture of gases which is in close equilibrium with the mixture of gases present in the patient's blood. During a patient's breath cycle, the last portion of an exhalation, i.e. the “end-tidal” portion is believed to provide the most accurate representation of the mixture of gases in the deep alveolar pockets of the lungs.
- Conventional breath analyzer devices obtain a number of measurements of gas concentrations in a patient's breath over a predetermined period of time. These measurements are utilized in a mathematical curve-fitting analysis which subsequently provides an approximate measurement of the gas concentrations for discrete portions of the patients breath, including the end-tidal portion.
- Accordingly, it would be advantageous to provide a system and method for analyzing the proportions and levels of one or more gases present in the breath of a patient, and which is capable of selectively analyzing only the end-tidal portion of the breath of a patient to provide an accurate direct measurement of the mixture of gases present in the patient's blood.
- Briefly stated, the present invention is configured to acquire a selected sample of a time-varying or periodic gas pattern. A gas intake is routed to a detector configured to continually monitor the time-varying or periodic element of the gas pattern. Output gas from the detector is directed to a branch. The branch configured to direct the flow of gas either into a sample volume contained between first and second flow selector valves, or to bypass the sample volume and directly enter a third flow selector valve. An air pump is operatively coupled to the third flow selector valve to draw gas through the system from the gas intake, and to force the gas through a fourth flow selector valve where it is either exhausted from the system or redirected back to the sample volume. A gas output from the first flow selector valve is configured to exhaust air from the sample volume through one or more gas analyzer.
- In an alternate embodiment, the present invention is configured to acquire a sample of exhaled air from an end-tidal portion of a patient's exhalation. A pair of air intakes are routed to a first flow selector valve. One of the pair of air intakes is configured to receive an exhalation from a patient or test subject, and preferably consists of a cannula adapted for tracheal or nasal insertion. The second air intake is configured to receive a supply of ambient air for diagnostic and calibration purposes. The second air intake preferably includes a CO2 scrubber adapted to reduce the level of CO2 present in the ambient air as it is drawn there through. Air output from the first flow selector valve is routed to a capnograph configured to continually monitor the level of CO2 present. Output air from the capnograph is directed to the input of a second flow selector valve. The second flow selector valve is configured to direct the flow of air either into a sample volume contained between third and fourth flow selector valves, or to bypass the sealable sample volume and directly enter the fourth flow selector valve. An air pump is operatively coupled to the fourth flow selector valve to draw air through the system from either of the pair of air intakes, and to force the air through a fifth flow selector valve where it is either exhausted from the system or redirected back to the sealable sample volume. An air output from the third flow selector valve is configured to exhaust air from the sample volume through a gas analyzer.
- A method of the present invention for capturing and analyzing a select portion of an periodic or time-varying gas patterns involves monitoring the periodic element of gas drawn into the system. Upon detection of a level of the periodic element in the gas drawn into the system reaching a predetermined threshold, a flow selector valve is operated to isolate a volume of air drawn into the system immediately prior to the detection of the threshold level. Incoming gas is diverted around the captured volume of gas, and the periodic element threshold levels are continually monitored to ensure that the captured volume of gas corresponds to the desired portion of the periodic or time-varying gas pattern. Once the captured volume of gas is positively identified as the desired portion, the captured volume is routed through one or more gas analyzers for analysis of one or more predetermined gas levels.
- An alternate method of the present invention for capturing and analyzing the end-tidal portion of an exhalation involves monitoring the CO2 level of air drawn into the system As the monitored CO2 level increases, it is known that the patient is exhaling. Upon detection of a decrease in the CO2 level in the air drawn into the system, a pair of flow selector valves are operated to capture the volume of air drawn into the system immediately prior to the detection of the decrease in the CO2 level. Incoming air is diverted around the captured volume of air, and the CO2 levels are continually monitored to ensure that the captured volume of air corresponds to the end-tidal portion of an exhalation. Once the captured volume of air is positively identified as the end-tidal portion of an exhalation, the captured volume is routed through one or more gas analyzers for analysis of one or more predetermined gas levels.
- The foregoing and other objects, features, and advantages of the invention as well as presently preferred embodiments thereof will become more apparent from the reading of the following description in connection with the accompanying drawings.
- In the accompanying drawings which form part of the specification:
-
FIG. 1 is a simplified component diagram of the periodic gas analyzer of the present invention; -
FIG. 2 is a simplified component diagram of a breath analyzer of the present invention, with flow selector valves configured for breath pass-through; -
FIG. 3 is the breath analyzer ofFIG. 2 , with the flow selector valves configured for breath sample isolation; and -
FIG. 4 is the breath analyzer ofFIG. 2 , with the flow selector valves configured for breath sample analysis. - Corresponding reference numerals indicate corresponding parts throughout the several figures of the drawings.
- The following detailed description illustrates the invention by way of example and not by way of limitation. The description clearly enables one skilled in the art to make and use the invention, describes several embodiments, adaptations, variations, alternatives, and uses of the invention, including what is presently believed to be the best mode of carrying out the invention.
- Turning to
FIG. 1 , a time-varying or periodic gas analyzer of the present invention is shown generally at 10. Apump 12 is operated to draw air into theapparatus 10 through agas intake 14 operatively placed to receive gas from a time-varying or periodic gas pattern. Interconnectingtubing 16 routes the received gas to adetector 22. Thedetector 22 is further configured to continually monitor the level of a periodic gas element or component present in the input airflow, and to provide one or more associated output signals representative of the level reaching a predetermined threshold. These associated output signals may include, but are not limited to, a measure of the periodic gas element or component present in the input airflow, an indication of an increase in the measure of the periodic gas element or component present in the input airflow, or an indication of a decrease in the measure of the periodic gas element or component present in the input airflow. - Downstream from the
detector 22, a “T”branch 24 and a series offlow selector valves sample volume 30 disposed betweenflow selector valves bypass pathway 32 disposed between the “T”branch 24 and theflow selector valve 28. The “T”branch 24 is configured to receive an output airflow from thedetector 22 and to direct the output airflow throughflow selector valve 26 into thesample volume 30, or into thebypass pathway 32 to flowselector valve 28. - Airflow exiting
flow selector valve 28 is drawn through thepump 12 and routed to aflow selector valve 34. Apressure sensor 36 is operatively coupled to the air pathway between thepump 12 and theflow selector valve 34.Pressure sensor 36 is configured to monitor the air flow pressure level between thepump 12 and theflow selector valve 34, and to provide a warning in the event the monitored pressure level falls outside a predetermined range.Flow selector valve 34 is configured to selectively direct an output airflow to either anexhaust port 38, or to thesample volume 30.Flow selector valve 26 is configured to selectively isolate thesample volume 30 from the input airflow received from the “T”branch 24, and to selectively couple thesample volume 30 to anexhaust port 42 through at least onegas analyzer 44. - Those of ordinary skill in the art will recognize that a suitably configured control circuit, such as a logic circuit, a microprocessor, or a general purpose computer (not shown) may be used to control the individual
flow selector valves detector 22. Furthermore the control circuit may be operatively coupled to the at least onegas analyzer 44 to provide an operator with one or more output representation of the gas analysis results and operation of theapparatus 10. Programming of a suitable control circuit to operate the above described components and to carry out the method of the present invention is considered to be routine to those of ordinary skill in the art of computer programming, and is not addressed further herein. - A method of the present invention for capturing and analyzing a select portion of a time-varying or periodic gas pattern involves monitoring the level of a periodic element or gas component in gas drawn into the
apparatus 10 through thegas intake 14. The level of the periodic element or gas component is monitored using thedetector 22, and is drawn in through thegas intake 14 anddetector 22 by thepump 12. The airflow passes through the “T”branch 24, and into thesample volume 30 contained betweenflow selector valves sample volume 30 throughflow selector valve 28, it is drawn through thepump 12 and propelled throughflow selector valve 34 to exit theapparatus 10 through theexhaust port 38. - As the monitored level of the periodic element or gas component in the incoming airflow through the
gas intake 14 anddetector 22 reaches a predetermined threshold,flow selector valves sample volume 30, the volume of air which was drawn into theapparatus 10 immediately prior to the detection of the threshold level by thedetector 22. - Subsequent incoming gas flow drawn into the
apparatus 10 by thepump 12 is diverted through thebypass pathway 32 at the “T”branch 24. Thebypass pathway 32 is routed around thesample volume 30, permitting a continued draw of gas through theapparatus 10. The threshold levels of the continued draw of gas through theapparatus 10 are monitored by thedetector 22 to ensure that the gas isolated within thesample volume 30 corresponds to the desired portion of an gas pattern, i.e. that the threshold levels of the gas drawn into theapparatus 10 satisfy a predetermined set of criteria, for example, that they are maintained for a predetermined period of time. Once the isolated gas in thesample volume 30 is positively identified as the desired portion, the captured volume is exhausted from theapparatus 10 through one ormore gas analyzers 44 for analysis of one or more predetermined gas levels. - To drive the captured volume of air contained within the
sample volume 30 through the one or more gas analyzers, theflow selector valve 34 is operated to divert the incoming air flow from theexhaust port 38 and instead, route the incoming gas flow into thesample volume 30. Simultaneously, theflow selector valve 26 is operated to open a pathway for gas flow to exhaustport 42 through the one ormore gas analyzers 44. - With
pump 12 operating at a known capacity, the flow rate of the incoming gas flow passing into thesample volume 30 is known. Accordingly, the flow rate of the volume of gas past the one ormore gas analyzers 44 is known. Eachgas analyzers 44 is selectively operated to sample the gas flow only for that portion of the gas flow which corresponds to the volume originally captured in thesample volume 30 which corresponds to the desired portion of the gas pattern. - Turning to
FIG. 2 , a modification of thebasic apparatus 10 shown inFIG. 1 , particularly adapted for collecting and analyzing end tidal breath exhalations is shown generally at 100. Components which are unchanged in function from the embodiment shown inFIG. 1 have the same reference numerals as shown inFIG. 1 . Apump 12 is operated to draw air into theapparatus 10 through either acannula 114 operatively placed to receive air from a patient's lungs, or a calibration air intake 116. The calibration air intake 116 is operatively placed to receive ambient air, and includes a CO2 scrubber 118 configured to reduce the level of CO2 in the ambient air drawn through the calibration air intake 116. Aflow selector valve 120 is configured to receive airflow from both thecannula 114 and the calibration air intake 116, and to select either thecannula 114 or the calibration air intake 116 to provide an input airflow to theapparatus 100. - Operatively coupled to the output of the
flow selector valve 120 via interconnecting tubing, acapnograph 122 is configured to receive the input airflow to theapparatus 100. Thecapnograph 122 is further configured to continually monitor the level of CO2 present in the input airflow, and to provide one or more associated output signals. These associated output signals may include, but are not limited to, a measure of the CO2 present in the input airflow, an indication of an increase in the measure of the CO2 present in the input airflow, or an indication of a decrease in the measure of the CO2 present in the input airflow. - To calibrate the
capnograph 122, theflow selector valve 120 is configured to draw ambient room air into theapparatus 100 through thecalibration air intake 16 and past the CO2 scrubber 118. In the CO2 scrubber 118, the amount of CO2 present in the drawn in ambient room air is reduced to a predetermined level, which is subsequently measured by thecapnograph 122. Any discrepancy between thecapnograph 122 CO2 measurement and the predetermined level is an indication that theapparatus 100 may require calibration. - Downstream from the
capnograph 122, aflow selector valve 124 optionally replaces “T”branch 24, to provide, withflow selector valves sample volume 30 disposed betweenflow selector valves bypass pathway 32 disposed betweenflow selector valves Flow selector valve 124 is configured to receive an output airflow from thecapnograph 122 and to selectively direct the output airflow either throughflow selector valve 26 into thesample volume 30, or into thebypass pathway 32 to flowselector valve 28. - Airflow exiting
flow selector valve 28 is drawn through thepump 12 and routed to aflow selector valve 34. Apressure sensor 36 is operatively coupled to the air pathway between thepump 12 and theflow selector valve 34.Pressure sensor 36 is configured to monitor the air flow pressure level between thepump 12 and theflow selector valve 34, and to provide a warning in the event the monitored pressure level falls outside a predetermined range. -
Flow selector valve 34 is configured to selectively direct an output airflow to either anexhaust port 38, or to thesample volume 30 through an optional one-way valve 140. One-way valve 140 is operatively disposed in thesample volume 30 adjacent theflow selector valve 28, such that an airflow entering thesample volume 30 through the one-way valve 140 will flow in the opposite direction to an airflow entering the sample volume through theflow selector valve 26. -
Flow selector valve 26 is configured to selectively isolate thesample volume 30 from the input airflow received from theflow selector valve 124, and to selectively couple thesample volume 30 to anexhaust port 42 through at least onegas analyzer 44. Preferably, the at least onegas analyzer 44 includes a CO sensor configured to measure the level of CO in the airflow passing there through. In an alternative embodiment, the at least onegas analyzer 44 includes an O2 sensor configured to measure the level of O2 in the airflow passing there through. - Those of ordinary skill in the art will recognize that a suitably configured control circuit, such as a logic circuit, a microprocessor, or a general purpose computer (not shown) may be used to control the individual
flow selector valves capnograph 122. Furthermore the control circuit may be operatively coupled to the at least onegas analyzer 44 to provide an operator with one or more output representation of the breath gas analysis results and operation of theapparatus 100. Programming of a suitable control circuit to operate the above described components and to carry out the method of the present invention is considered to be routine to those of ordinary skill in the art of computer programming, and is not addressed further herein. - A method of the present invention for capturing and analyzing the end-tidal portion of an exhalation involves monitoring the CO2 level of aspirated breath air drawn from a patient's respiratory system into the
apparatus 100 through thecannula 114. The CO2 level of the incoming air is monitored using thecapnograph 122. Normal breath airflow through theapparatus 100 is drawn in through thecannula 114 andcapnograph 122 by thepump 12. The airflow passes through theflow selector valve 124, and into thesample volume 30 contained betweenflow selector valves sample volume 30 throughflow selector valve 28, it is drawn through thepump 12 and propelled throughflow selector valve 34 to exit theapparatus 100 through theexhaust port 38. - As the monitored CO2 level in the incoming airflow through the
cannula 114 andcapnograph 122 increases, it is known that the patient is exhaling. Upon detection by thecapnograph 122 of a decrease in the CO2 level of the air drawn into theapparatus 100 through thecannula 114, aflow selector valves FIG. 3 , to capture, in thesample volume 30, the volume of air which was drawn into theapparatus 100 immediately prior to the detection of the decrease in the CO2 level by thecapnograph 122. - Subsequent incoming air flow drawn into the
apparatus 100 by thepump 12 is diverted through thebypass pathway 32 by theflow selector valve 124. Thebypass pathway 32 is routed around thesample volume 30, permitting a continued draw of air through theapparatus 100. The CO2 levels of the continued draw of air through theapparatus 100 are monitored by thecapnograph 122 to ensure that the air isolated within thesample volume 30 corresponds to the end-tidal portion of an exhalation, i.e. that the CO2 levels of the air drawn into theapparatus 100 continue to decrease for a predetermined period of time at a predetermined rate of decrease. Once the isolated air in thesample volume 30 is positively identified as the end-tidal portion of an exhalation, the captured volume is exhausted from theapparatus 100 through one or more gas analyzers for analysis of one or more predetermined gas levels. - To drive the captured volume of air contained within the
sample volume 30 through the one or more gas analyzers, theflow selector valve 34 is operated to divert the incoming air flow from theexhaust port 38 and instead, route the incoming air flow into thesample volume 30 through the optional one-way valve 140. Simultaneously, theflow selector valve 26 is operated to open a pathway for airflow to exhaustport 42 through the one ormore gas analyzers 44. The operative position of the one-way valve 140 in relation to theflow selector valve 26 causes the incoming air flow from the one-way valve 140 to drive the volume of air contained within thesample volume 30 through theflow selector valve 26 and through the one ormore gas analyzers 44. - With
pump 12 operating at a known capacity, the flow rate of the incoming air flow passing through one-way valve 140 into thesample volume 30 is known. Accordingly, the flow rate of the volume of air past the one ormore gas analyzers 44 is known. Eachgas analyzers 44 is selectively operated to sample the air flow only for that portion of the air flow which corresponds to the volume originally captured in thesample volume 30 which corresponds to the end-tidal portion of a patient's breath. Preferably, at least onegas analyzer 44 measures a level of CO present in the air flow passing there through. Alternatively, a gas analyzer measures a level of O2 present in the air flow. - The present invention can be embodied in-part the form of computer-implemented processes and apparatuses for practicing those processes. The present invention can also be embodied in the form of computer program code containing instructions embodied in-part in tangible media, such as floppy diskettes, CD-ROMs, hard drives, or an other computer readable storage medium, wherein, when the computer program code is loaded into, and executed by, an electronic device such as a computer, micro-processor or logic circuit, the device becomes an apparatus for practicing the invention.
- The present invention can also be embodied in-part the form of computer program code, for example, whether stored in a storage medium, loaded into and/or executed by a computer, or transmitted over some transmission medium, such as over electrical wiring or cabling, through fiber optics, or via electromagnetic radiation, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus for practicing the invention. When implemented in a general-purpose microprocessor, the computer program code segments configure the microprocessor to create specific logic circuits.
- In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results are obtained. As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Claims (22)
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2003
- 2003-06-19 WO PCT/US2003/019310 patent/WO2005006988A1/en active Application Filing
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- 2003-06-19 US US10/561,561 patent/US8021308B2/en active Active
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2011
- 2011-06-03 US US13/153,169 patent/US9095276B2/en active Active
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2015
- 2015-07-29 US US14/812,822 patent/US9936897B2/en not_active Expired - Lifetime
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2018
- 2018-04-06 US US15/947,436 patent/US20190076056A1/en not_active Abandoned
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US20120150055A1 (en) | 2012-06-14 |
US20150327793A1 (en) | 2015-11-19 |
US9095276B2 (en) | 2015-08-04 |
US9936897B2 (en) | 2018-04-10 |
US8021308B2 (en) | 2011-09-20 |
US20060241507A1 (en) | 2006-10-26 |
AU2003238288A1 (en) | 2005-02-04 |
WO2005006988A1 (en) | 2005-01-27 |
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