Exhaled Breath Condensate Collection and Assay System and Method

• US 20080214947A1
• Filed: 08/19/2005
• Published: 09/04/2008
• Est. Priority Date: 08/20/2004
• Status: Abandoned Application

• Current Assignee: University of Virginia
• Original Assignee: University of Virginia
• Inventors: Hunt, John F., Mackey, Dan, Baddour, Alfred R., Walsh, Brian K.
• Application Number:
  US11/660,653
• Publication Number:
  US 20080214947A1
• Time in Patent Office: Days
• US Class Current: 600/532
• CPC Class Codes: A61B 5/083 Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
• CPC Class Codes: A61B 5/097 Devices for facilitating collection of breath or for directing breath into or through measuring devices
• CPC Class Codes: A61B 5/14539 for measuring pH

Abstract

A method and system that provides for minute-to-minute EBC pH monitoring (or for other EBC characteristic monitoring) of a subject that greatly assists in determining the time-course of airway pH changes (or other characteristic changes) in evolving disease processes, and may assist in determining the predictive ability of these tests, as well as determining response to therapy.

Claims

1. A method for monitoring a respiratory condition of a subject based on exhaled breath received from the subject, said method comprising:

continuously or continually collecting exhaled breath condensate (EBC) produced from the subject'"'"'s exhaled breath; and

continually or continuously measuring one or more characteristics of the EBC.

2. The method of claim 1, further comprising gas standardizing the EBC.

3. The method of claim 2, wherein said gas standardizing comprises deaerating.

4. The method of claim 1 or 2 wherein the exhaled breath is received from the subject by way of a ventilator.

5. The method of claim 1 or 2 wherein the exhaled breath is received from the subject by way of a non-invasive respiratory device.

6. The method of claim 5, wherein said non-invasive respiratory device comprises a mask, mouthpiece, or other non-invasive breath collection or directing system.

7. The method of claim 5, wherein said non-invasive respiratory device comprises at least one of PAP device, CPAP device, or BiPAP device.

8. The method of claim 1 or 2 wherein the exhaled breath is received from the subject by way of an invasive respiratory device.

9. The method of claim 8, wherein said invasive respiratory device comprises at least one of endotracheal device, endotracheal tube or tracheostomy tube.

10. The method of claim 8, wherein said invasive respiratory device comprises a at least one of PAP device, CPAP device, IPPV device, SIMV device or BiPAP device, or mechanical machines used in intensive care units, operating rooms or at home.

11. The method of claim 2, comprising:

collecting the EBC in a first chamber, and wherein the gas standardizing comprises applying a first chamber gas supply to said collected EBC in said first chamber.

12. The method of claim 11, comprising:

collecting the EBC in a second chamber after traveling through said first chamber.

13. The method of claim 12, wherein the gas standardizing further comprises applying a second chamber gas supply to said collected EBC in said second chamber.

14. The method of claim 13, further comprising:

controlling the flow of applied second chamber gas supply to said second chamber.

15. The method of claim 14, further comprising:

controlling the flow of applied first chamber gas supply to said first chamber.

16. The method of claims 14, wherein said continual or continual measurement of one or more characteristics of the EBC comprises using a means for testing the EBC to determine the one or more characteristics of the EBC, said testing means being in fluid communication with EBC in said first and/or second chamber.

17. The method of claim 11, further comprising:

controlling the flow of applied first chamber gas supply to said first chamber.

18. The method of claims 1 or 2, wherein said continual or continuous measurement of one or more characteristics of the EBC comprises using a means for testing the EBC to determine the one or more characteristics of the EBC.

19. The method of claim 18, wherein said testing means comprises at least one of electronic monitor, monitor, probe, or electric probe, or any combination thereof.

20. The method of claim 18, wherein the one or more characteristics of the EBC comprises pH.

21. The method of claim 18, wherein the one or more characteristics of the EBC comprises at least one of oxidation/reduction potential (ORP), ammonia, conductivity, a specific anion or cation probe, nitrogen oxides or redox potential.

22. The method of claim 18, further comprising:

acquiring data from said testing means.

23. The method of claim 22, further comprising:

evaluating the acquired data.

24. The method of claim 23, wherein said evaluation comprises:

determining the presence, absence or status of a disease or response to therapy.

25. The method of claim 24, wherein said disease is a respiratory disease.

26. The method of claim 23, wherein said evaluation comprises determining presence, absence or status of at least one of the following:

asthma, chronic obstructive pulmonary disease (COPD), ventilator-associated pneumonia (VAP), gastric acid reflux and aspiration, respiratory viral infections (including rhinovirus, respiratory syncitial virus, and others) chemical exposures (such as chlorine gas), near-drownings, acute respiratory distress syndrome (ARDS), acute lung injury, trauma (chest, multi-organ or other).

27. The method of claim 1, wherein said collect EBC collects in a first chamber.

28. The method of claim 27, wherein said collected EBC additionally collects in a second chamber.

29. The method of claim 1, comprising cooling the exhaled breath to provide the collected EBC.

30. The method of claims 1 or 2, further comprising:

evaluating the acquired data.

31. The method of claim 30, wherein said evaluation comprises:

determining the presence, absence or status of a disease or response to therapy.

32. The method of claim 31, wherein said disease is a respiratory disease.

33. The method of claim 30, wherein said evaluation comprises determining presence, absence or status of at least one of the following:

asthma, chronic obstructive pulmonary disease (COPD), ventilator-associated pneumonia (VAP), gastric acid reflux and aspiration, respiratory viral infections (including rhinovirus, respiratory syncitial virus, and others) chemical exposures (such as chlorine gas), near-drownings, acute respiratory distress syndrome (ARDS), acute lung injury, trauma (chest, multi-organ or other).

34. The method of claim 1, wherein duration of said continuous or continual collection is equal to a single exhaled breath or a portion of a single exhaled breath from the subject.

35. The method of claim 1, wherein duration of said continuous or continual collection is greater than a single exhaled breath from the subject.

36. The method of claim 1, wherein duration of said continual or continuous measurement is at least as great as a period sufficient to acquire data required for said measurement.

37. The method of claim 36, wherein said acquisition is accomplished using an electronic, electrical or analog device or any combination thereof.

38. The method of claim 1, wherein duration of said continuous or continual collection is equal to the duration or portion of duration that is required for treatment, therapy, monitoring, test or experiment with the subject.

39. The method of claim 1, wherein duration of said continuous or continual collection is equal to a period of less than about 1 minute.

40. The method of claim 1, wherein duration of said continuous or continual collection is equal to a period of about 0.5 minutes to about 5 minutes.

41. The method of claim 1, wherein duration of said continuous or continual collection is equal to a period of about 1 minute to about 1 hour.

42. The method of claim 1, wherein duration of said continuous or continual collection is equal to a period of about 1 hour to about 12 hours.

43. The method of claim 1, wherein duration of said continuous or continual collection is equal to a period of about 12 hours to about a day.

44. The method of claim 1, wherein duration of said continuous or continual collection is equal to a period of about 1 day to about 1 year.

45. The method of claim 1, wherein duration of said continuous or continual collection is equal to a period greater than about 1 year.

46. The method of any one of claims 34-45, wherein at least one interruption occurs during period of said collection.

47. A method for monitoring a respiratory condition of a subject based on exhaled breath received from the subject, said method comprising:

continuously or continually collecting exhaled breath condensate (EBC) produced from the subject'"'"'s exhaled breath; and

continually or continuously measuring PH of the EBC.

48. The method of claim 47, further comprising:

evaluating the acquired data.

49. The method of claim 48, wherein said evaluation comprises:

determining the presence, absence or status of a disease or response to therapy.

50. The method of claim 49, wherein said disease is a respiratory disease.

51. The method of claim 48, wherein said evaluation comprises determining presence, absence or status of at least one of the following:

asthma, chronic obstructive pulmonary disease (COPD), ventilator-associated pneumonia (VAP), gastric acid reflux and aspiration, respiratory viral infections (including rhinovirus, respiratory syncitial virus, and others) chemical exposures (such as chlorine gas), near-drownings, acute respiratory distress syndrome (ARDS), acute lung injury, trauma (chest, multi-organ or other).

52. A system for monitoring a respiratory condition of a subject, said system comprising:

an exhaled breath port in communication with a condensate chamber;

said condensate chamber being configured to condense the subject'"'"'s exhaled breath received from said port and produce exhaled breath condensate (EBC);

a first collection chamber configured to continuously or continually collect the EBC;

a drain off port configured to drain the collected EBC in said first collection chamber as the collected EBC reaches a predetermined volume; and

a means for continually or continuously measuring one or more characteristics of the collected EBC.

53. The system of claim 52, further comprising

a gas standardizing means for standardizing the collected EBC from the subject, said gas standardizing means being in communication with said collected EBC.

54. The system of claim 53, wherein said gas standardizing comprises a gas supply.

55. The system of claim 54, wherein said gas supply comprises at least one of oxygen, argon, or nitrogen or any gas mixture from which carbon dioxide has been scrubbed or removed by available means.

56. The system of claim 52, wherein said continual or continuous measurement of one or more characteristics of the EBC comprises a means for testing the EBC to determine the one or more characteristics of the EBC, said testing means being in fluid communication with EBC in said first chamber.

57. The system of claim 52, comprising a cooling device in communication with said condensate chamber to produce the EBC.

58. The system of claim 57, wherein said cooling device comprises at least one of cooling sleeve, ice, endothermal chemical reaction, cold water bath, thermocouple cooling technique, heat pump, heat sink or other available chilling process/device.

59. The system of claim 52, wherein duration of said continuous or continual collection is equal to a single exhaled breath or a portion of a single exhaled breath from the subject.

60. The system of claim 52, wherein duration of said continuous or continual collection is greater than a single exhaled breath from the subject.

61. The system of claim 52, wherein duration of said continual or continuous measurement is at least as great as a period sufficient to acquire data required for said measurement.

62. The system of claim 61, wherein said acquisition is accomplished using an electronic, electrical or analog device or any combination thereof.

63. The system of claim 52, wherein duration of said continuous or continual collection is equal to the duration or portion of duration that is required for treatment, therapy, monitoring, test or experiment with the subject.

64. The system of claim 52, wherein duration of said continuous or continual collection is equal to a period of less than about 1 minute.

65. The system of claim 52, wherein duration of said continuous or continual collection is equal to a period of about 0.5 minutes to about 5 minutes.

66. The system of claim 52, wherein duration of said continuous or continual collection is equal to a period of about 1 minute to about 1 hour.

67. The system of claim 52, wherein duration of said continuous or continual collection is equal to a period of about 1 hour to about 12 hours.

68. The system of claim 52, wherein duration of said continuous or continual collection is equal to a period of about 12 hours to about a day.

69. The system of claim 52, wherein duration of said continuous or continual collection is equal to a period of about 1 day to about 1 year.

70. The system of claim 52, wherein duration of said continuous or continual collection is equal to a period greater than about 1 year.

71. The system of any one of claims 59-70, wherein at least one interruption occurs during period of said collection.

72. The system of claims 52 or 53, further comprising:

a means for evaluating the acquired data.

73. The system of claim 72, wherein said evaluation comprises:

determining the presence, absence or status of a disease or response to therapy.

74. The system of claim 73, wherein said disease is a respiratory disease.

75. The system of claim 72, wherein said evaluation comprises determining presence, absence or status of at least one of the following:

asthma, chronic obstructive pulmonary disease (COPD), ventilator-associated pneumonia (VAP), gastric acid reflux and aspiration, respiratory viral infections (including rhinovirus, respiratory syncitial virus, and others) chemical exposures (such as chlorine gas), near-drownings, acute respiratory distress syndrome (ARDS), acute lung injury, trauma (chest, multi-organ or other).

76. A system for monitoring a respiratory condition of a subject, said system comprising:

an exhaled breath port in communication with a condensate chamber;

said condensate chamber being configured to condense the subject'"'"'s exhaled breath received from said port and produce exhaled breath condensate (EBC);

a first collection chamber configured to continuously collect the EBC;

a second collection chamber in fluid communication with said first collection chamber and configured to continuously or continually collect the EBC from the first collection chamber as the first chamber collected EBC reaches a predetermined level in said first collection chamber;

a drain off channel configured to drain the collected EBC in said second collection chamber as the collected EBC in said second collection chamber reaches a predetermined volume; and

a means for continually or continuously measuring one or more characteristics of the collected EBC.

77. The system of claim 76, comprising:

an inter-chamber port configured to pass the collected EBC in said first chamber to said second chamber.

78. The system of claim 76, further comprising

a gas standardizing means for standardizing the collected EBC from the patient, said gas standardizing means being in communication with said collected EBC in said first and/or second collection chamber.

79. The system of claim 78, wherein said gas standardizing comprises a gas supply.

80. The system of claim 79, wherein said gas supply comprises at least one of oxygen, argon, or nitrogen or any gas mixture from which carbon dioxide has been scrubbed or removed by available means.

81. The system of claim 76, comprising a cooling device in communication with said condensate chamber to produce the EBC.

82. The system of claim 81, wherein said cooling device comprises at least one of cooling sleeve, ice, endothermal chemical reaction, cold water bath, thermocouple cooling technique, heat pump, heat sink or other available chilling process/device.

83. The system of claim 76, wherein duration of said continuous or continual collection is equal to a single exhaled breath or a portion of a single exhaled breath from the subject.

84. The system of claim 76, wherein duration of said continuous or continual collection is greater than a single exhaled breath from the subject.

85. The system of claim 76, wherein duration of said continual or continuous measurement is at least as great as a period sufficient to acquire data required for said measurement.

86. The system of claim 85, wherein said acquisition is accomplished using an electronic, electrical or analog device or any combination thereof.

87. The system of claim 76, wherein duration of said continuous or continual collection is equal to the duration or portion of duration that is required for treatment, therapy, monitoring, test or experiment with the subject.

88. The system of claim 76, wherein duration of said continuous or continual collection is equal to a period of less than about 1 minute.

89. The system of claim 76, wherein duration of said continuous or continual collection is equal to a period of about 0.5 minutes to about 5 minutes.

90. The system of claim 76, wherein duration of said continuous or continual collection is equal to a period of about 1 minute to about 1 hour.

91. The system of claim 76, wherein duration of said continuous or continual collection is equal to a period of about 1 hour to about 12 hours.

92. The system of claim 76, wherein duration of said continuous or continual collection is equal to a period of about 12 hours to about a day.

93. The system of claim 76, wherein duration of said continuous or continual collection is equal to a period of about 1 day to about 1 year.

94. The system of claim 76, wherein duration of said continuous or continual collection is equal to a period greater than about 1 year.

95. The system of any one of claims 83-94, wherein at least one interruption occurs during period of said collection.

96. The system of claims 76 or 78, further comprising:

a means for evaluating the acquired data.

97. The system of claim 96, wherein said evaluation comprises:

determining the presence, absence or status of a disease or response to therapy.

98. The system of claim 97, wherein said disease is a respiratory disease.

99. The system of claim 96, wherein said evaluation comprises determining presence, absence or status of at least one of the following:

asthma, chronic obstructive pulmonary disease (COPD), ventilator-associated pneumonia (VAP), gastric acid reflux and aspiration, respiratory viral infections (including rhinovirus, respiratory syncitial virus, and others) chemical exposures (such as chlorine gas), near-drownings, acute respiratory distress syndrome (ARDS), acute lung injury, trauma (chest, multi-organ or other).