Microchanneled active fluid transport devices

• US 6,290,685 B1
• Filed: 06/18/1998
• Issued: 09/18/2001
• Est. Priority Date: 06/18/1998
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Knoll, Randall L., Johnston, Raymond P., Insley, Thomas I.
• Primary Examiner(s): Dawson, Glenn K.
• Assistant Examiner(s): PLUCINSKI, JAMISUE A
• Application Number:
  US09/099,269
• Time in Patent Office: 1,188 Days
• Field of Search: 604/317, 604/322, 604/319, 604/19, 604/268, 604/27, 604/28, 604/289-290, 604/30, 604/312-314, 604/316, 604/32-35, 604/323, 604/326, 604/356-357, 604/73, 604/902, 165/6, 128/134, 128/303.R, 128/846-847, 128/849-852, 153/10--11, 204/195.B, 204/195.M, 204/195.R, 210/488-490, 210/492, 210/496, 210/498, 210/500, 210/506, 232/30.B, 232/30.R, 269/15, 269/21, 269/327, 269/244, 422/100, 422/68, 422/79, 435/310, 435/4, 442/50-58
• US Class Current: 604/317
• CPC Class Codes: A61M 1/84 Drainage tubes; Aspiration tips for negative pressure wound therapy A61M1/90; for surgical cutting instruments A61B17/32
• CPC Class Codes: F28F 21/065 the heat-exchange apparatus employing plate-like or laminated conduits
• CPC Class Codes: F28F 2260/02 having microchannels
• CPC Class Codes: Y10S 366/03 Micromixers: variable geometry from the pathway influences mixing/agitation of non-laminar fluid flow

Abstract

An active fluid transport device (10, 40, 54, 60) that includes a layer (12) of polymeric material. The layer (12) has a structured surface (13) that includes a plurality of substantially discrete flow channels (16). The flow channels (16) have a minimum aspect ratio of about 10 to 1 and a hydraulic radius no greater than about 300 micrometers. The device may also include a connector (20, 55) that allows a potential source (14) external to the structured surface (13) to be placed in fluid communication with the discrete flow channels (16). The potential source (14) promotes fluid movement through the flow channels (16) from a first location to a second location.

Claims

1. An active fluid transport device that comprises:

(a) a layer of polymeric film material having a first major surface that includes a structured surface that has a plurality of discrete flow channels disposed thereon, the flow channels extend from a first point to a second point along the structured surface and have a minimum aspect ratio of about 10;

1 and a hydraulic radius no greater than about 300 micrometers;

(b) a source external to the structured surface for providing a potential over the flow channels; and

(c) a connector that is in fluid communication between the discrete flow channels and the external source, which connector allows the potential from the source external to the structured surface to be applied to the flow channels to promote fluid movement through the flow channels from a first location to a second location.

2. The active fluid transport device of claim 1, wherein the layer of polymeric material is microreplicated.

3. The active fluid transport device of claim 1, wherein the connector includes a manifold that has a plenum defined internally therein.

4. The active fluid transport device of claim 1, wherein the connector includes a manifold that is disposed fluidically between the flow channels and the potential source, the potential from the potential source being applied to the flow channels via the manifold.

5. The active fluid transport device of claim 1, wherein the connector includes one or more of the following:

a manifold, a compression coupling, seal, or gasket that fluidically joins a conduit to the flow channels, capillary fibers, a microstructured fluid conduit, a system for seating the discrete microstructured flow channels in a centrifuge, and a system for allowing a flow stream to be directed at channel inlets or channel outlets.

6. The active fluid transport device of claim 1, wherein the flow channels include a cap layer that is juxtaposed against the structured surface.

7. The active fluid transport device of claim 6, wherein the cap layer is sealingly secured to the structure surface to define the discrete flow channels.

8. The active fluid transport device of claim 1, wherein the potential source includes one or more of the following:

a vacuum generator, a pump, a fan, a magneto-hydrodynamic drive, an acoustic flow system, a centrifuge, and a hydrostatic head.

9. The active fluid transport device of claim 1, wherein the structured surface includes v-shaped channels.

10. The active fluid transport device of claim 1, wherein the flow channels are configured to have a flat valley between slightly flattened peaks.

11. The active fluid transport device of claim 1, wherein the structured surface includes a plurality of channels that have smaller channels disposed therebetween.

12. The active fluid transport device of claim 1, wherein the flow channels include plural discrete converging channels that connect to a larger discrete channel.

13. The active fluid transport device of claim 1, wherein the flow channels have a minimum aspect ratio exceeding 100:

1.

14. The active fluid transport device of claim 1, wherein the flow channels have a minimum aspect ratio of at least 1,000:

1.

15. The active fluid transport device of claim 13, wherein the aspect ratio is less than 1,000,000:

1.

16. The active fluid transport device of claim 1, wherein the hydraulic radius is no greater than 100 micrometers.

17. The active fluid transport device of claim 1, wherein the hydraulic radius is less than 10 micrometers.

18. The active fluid transport device of claim 1, wherein the layer of polymeric material has a thickness less than 5,000 micrometers.

19. The active fluid transport device of claim 1, wherein the layer of polymeric material has a thickness less than 15,000 micrometers.

20. The active fluid transport device of claim 1, wherein the flow channels are defined by peaks that have a height of approximately 5 to 1,200 micrometers and that have a peak distance of about 10 to 2,000 micrometers.

21. The active fluid transport device of claim 1, wherein the microstructure channel density is from about 10 per lineal centimeter up to 1,000 per lineal centimeter.

22. The active fluid transport device of claim 3, wherein the flow channels have an aspect ratio that is at least 400% greater than the manifold.

23. The active fluid transport device of claim 3, wherein the flow channels have an aspect ratio that is at least 900% greater than the manifold.

24. A liquid acquisition and evacuation mat that comprises the active fluid transport device of claim 1, and further includes a liquid absorbing layer that is disposed above the layer of polymeric material when the mat is in use, the liquid absorbing layer permitting liquid that contacts the layer to travel therethrough.

25. The liquid acquisition and evacuation mat of claim 24, wherein the liquid absorbing layer comprises a nonwoven web of meltblown microfibers.

26. The liquid acquisition and evacuation mat of claim 24, further comprising a support layer that is disposed beneath the liquid absorbing layer when the mat is in use, the support layer being liquid impermeable.

27. The liquid acquisition and evacuation mat of claim 26, wherein the support layer includes a microstructured layer that has flow channels disposed thereon.

28. The liquid acquisition and evacuation mat of claim 27, wherein the support layer is an integral extension of the layer of polymeric material that is present in the active fluid transport device.

29. The liquid acquisition and evacuation mat of claim 24, that includes a capillary module that has a pennant configuration.

30. The active fluid transport device of claim 1, wherein the device includes multiple structured layers in the form of a stack.

31. The active fluid transport device of claim 30, wherein the layer of polymeric material has a second major surface that caps the structured surface on the first major surface.

32. The active fluid transport device of claim 30, wherein the stack includes at least 10 structured layers.

33. The active fluid transport device of claim 30, wherein the stack includes at least 100 structured layers.

34. An aspirator that comprises the active fluid transport device of claim 1.

35. An aspirator that comprises the stack of claim 30, as a capillary module.

36. The aspirator of claim 33, wherein the stack is flexible.

37. The aspirator of claim 36, wherein the stack is about 1 to 10 centimeters in length, and wherein the multiple structured layers are not secured to each other at the stack'"'"'s inlet end.

38. The aspirator of claim 35, wherein a sheath is disposed over the stack of claim 35.

39. The aspirator of claim 35, wherein the connector includes a conduit that is attachable to a vacuum, the connector being fluidically attached to the flow channels in the stack.

40. The aspirator of claim 36, wherein the stack is subdivided into a plurality of branches.

41. The aspirator of claim 40, wherein a plurality of conduits are placed in fluid communication with the plurality of branches such that fluid is transported through some of the conduits independent of other conduits.

42. The aspirator of claim 41, wherein a first conduit is adapted to transport an irrigation fluid, and a second conduit is adapted to transport an aspirated fluid.

43. The aspirator of claim 30, being adaptable such that it can rest on a person'"'"'s lip such that the aspirator can withdraw saliva and other fluids present in the person'"'"'s mouth.

44. The active fluid transport device of claim 1, further comprising first and second manifolds disposed at the flow channels'"'"' inlets and outlets.

45. A heat exchanger that comprises the active fluid transport device of claim 41.

46. The heat exchanger of claim 43, wherein the heat exchanger is flexible.

47. A blanket that comprises the heat exchanger of claim 44.

48. The heat exchanger of claim 43, wherein the discrete flow channels include a cap layer that has a thickness of about 0.02 to 0.2 mm.

49. The active fluid transport device of claim 1, wherein the flow channels are adapted to influence a characteristic of a fluid that flows therethrough.

50. The active fluid transport device of claim 49, wherein the fluid is treated by chemical, catalytic, or ionization reactions promoted by constituents placed on or in the flow channel surfaces.

51. The active fluid transport device of claim 49, wherein the flow channels are adapted to provide a separation treatment such that a fluid passing therethrough has constituents removed from its flow stream.

52. The active fluid transport device of claim 1, wherein the flow channels are configured such that fluid streams of different compositions merge together to interact.

53. The active fluid transport device of claim 1, wherein the flow channels are defined by the structured surface and a cap layer that are joined together in the form of a capillary module that can be conformed about a mandrel that has a diameter of approximately 2.5 centimeters without significantly constricting the flow channels.

54. The active fluid transport device of claim 1, wherein the layer of polymeric material includes a body layer that comprises a polymer that is more flexible than the polymer that defines the structured surface.

55. The active fluid transport device of claim 1, wherein the layer of polymeric material is in the form of a film.

56. The active fluid transport device of claim 1, having more than 100 discrete flow channels.

57. The active fluid transport device of claim 1, having more than 1,000 discrete flow channels.

58. The active fluid transport device of claim 1, having more than 10,000 discrete flow channels.

59. The active fluid transport device of claim 1, having 50 to 10,000 channel inlets per square centimeter.

60. The active fluid transport device of claim 1, wherein the connector includes discrete conduits that each fluidically connect to individual discrete flow channels.

61. A method of transporting a fluid which comprises passing the fluid through the active fluid transport device of claim 1.

62. The method of claim 61, wherein the fluid includes a bodily fluid.

63. The method of claim 62, wherein the bodily fluid includes saliva.

64. The method of claim 61, wherein the bodily fluid includes blood, plasma, or bodily secretions.

65. The method of claim 61, wherein the fluid includes smoke.

66. The method of claim 61, wherein the fluid includes a liquid.

67. The method of claim 66, wherein the liquid is an aqueous liquid.

99. The active fluid transport device of claim 1, wherein the flow channels are defined by the structured surface and a cap layer that are joined together in the form of a capillary module that can be conformed about a mandrel that has a diameter of approximately 2.5 centimeters without significantly constricting the flow channels.

101. The active fluid transport device of claim 1, wherein the flow channels contain constituents that enable chemical, catalytic, and ionization reactions to occur as the fluid moves through the channels.

102. The active fluid transport device of claim 1, wherein the flow channels are adapted to detect physical characteristics of a fluid flowing therethrough.

68. An active fluid transport device that comprises:

(a) a layer of polymeric film material having a first major surface that includes a structured surface that has a plurality of discrete flow channels disposed thereon, the flow channels extend from a first point to a second point along the structured surface and have a minimum aspect ratio of about 10;

1 and a hydraulic radius no greater than about 300 micrometers;

(b) a source external to the layer of polymeric film material for providing a potential over the flow channels; and

(c) a manifold disposed fluidically between the plurality of flow channels and the external source to connect the flow channels to the source and to apply the potential to the plurality of flow channels to promote fluid movement through the flow channels from a first location to a second location.

69. The active fluid transport device of claim 68, wherein the layer of polymeric material is microreplicated.

70. The active fluid transport device of claim 68, wherein the flow channels include a cap layer that is juxtaposed against the structured surface.

71. The active fluid transport device of claim 70, wherein the cap layer is sealingly secured to the structure surface to define the discrete flow channels.

72. The active fluid transport device of claim 68, wherein the potential source includes one or more of the following:

a vacuum generator, a pump, a fan, a magneto-hydrodynamic drive, an acoustic flow system, a centrifuge, and a hydrostatic head.

73. The active fluid transport device of claim 68, wherein the structured surface includes v-shaped channels.

74. The active fluid transport device of claim 68, wherein the flow channels have a minimum aspect ratio exceeding 100:

1.

75. The active fluid transport device of claim 68, wherein the flow channels have a minimum aspect ratio of at least 1,000:

1 and a hydraulic radius no greater than 100 micrometers.

76. The active fluid transport device of claim 68, wherein the channels are discrete along their whole length.

77. The active fluid transport device of claim 68, wherein the hydraulic radius is less than 10 micrometers, and wherein the layer of polymeric material has a thickness less than 5,000 micrometers.

78. The active fluid transport device of claim 68, wherein the layer of polymeric material has a second major surface that includes a structured surface.

79. The active fluid transport device of claim 78, wherein the second major surface comprises a polymeric material.

80. A liquid acquisition and evacuation mat that comprises the active fluid transport device of claim 68, and further includes a liquid absorbing layer that is disposed above the layer of polymeric material when the mat is in use, the liquid absorbing layer permitting liquid that contacts the layer to travel therethrough.

81. The active fluid transport device of claim 68, wherein the device includes multiple structured layers in the form of a stack, and wherein the layer of polymeric material has a second major surface that caps the structured surface on the first major surface.

82. The active fluid transport device of claim 81, wherein the stack includes multiple connectors to allow multiple potential sources to be attached to the stack.

83. The active fluid transport device of claim 81, wherein the stack includes at least 10 structured layers.

84. An aspirator the comprises the active fluid transport device of claim 68.

85. A method of transporting a fluid, which comprises passing methane gas through the aspirator of claim 84.

86. A method of transporting a fluid, which comprises passing blood, plasma, secretions, surgical irrigation fluids, or a combination thereof through the aspirator of claim 84.

87. A heat exchanger that comprises the active fluid transport device of claim 68.

88. The active fluid transport device of claim 68, having more than 100 discrete flow channels.

89. The active fluid transport device of claim 68, having more than 1,000 discrete flow channels.

90. The active fluid transport device of claim 68, having 50 to 10,000 channel inlets per square centimeter.

91. The active fluid transport device of claim 68, further comprising a connector that includes discrete conduits that each fluidically connect to individual discrete flow channels.

92. A method of transporting a fluid which comprises passing a fluid through the active fluid transport device of claim 68.

93. The method of claim 92, wherein the fluid includes a bodily fluid.

94. The method of claim 92, wherein the bodily fluid includes saliva.

95. An active fluid transport device that comprises:

(a) a capillary module that includes a layer of polymeric film material that has a first major surface that includes a structured surface that is capped with a cap layer to define discrete flow channels, the discrete flow channels allow a fluid to be transported therethrough from a first point to a second point, the flow channels also have a minimum aspect ratio of 10;

1 and a hydraulic radius no greater than about 300 miicrometers;

(b) a source external to the structured surface for providing a potential over the flow channels; and

(c) a connector that is in fluid communication between the discrete flow channels and the external source, which connector allows the potential from the source external to the structured surface to be applied to the flow channels to promote fluid movement through the flow channels from a first location to a second location.

96. The active fluid transport device of claim 95, wherein the capillary module has a thickness of 1 to 10 millimeters.

97. The active fluid transport device of claim 95, wherein the capillary module has a thickness of 2 to 6 millimeters.

98. The active fluid transport device of claim 95, wherein the capillary module is flexible.

100. A method of transporting a fluid, which comprises:

transporting a fluid through the active fluid transport device of claim 95.

103. A microstructured channeled device that comprises:

a layer of polymeric film material that has a first major surface that includes a structured surface;

the structured surface comprising flow channels that have a minimum aspect ratio of about 10;

1 and a hydraulic radius no greater than about 300 micrometers;

the flow channels also possessing constituents that enable chemical, catalytic, and ionization reactions to occur as a fluid contacts the channels.