US20020150502A1 - Surface tension reduction channel - Google Patents
Surface tension reduction channel Download PDFInfo
- Publication number
- US20020150502A1 US20020150502A1 US10/114,864 US11486402A US2002150502A1 US 20020150502 A1 US20020150502 A1 US 20020150502A1 US 11486402 A US11486402 A US 11486402A US 2002150502 A1 US2002150502 A1 US 2002150502A1
- Authority
- US
- United States
- Prior art keywords
- channel
- reservoir
- fluid
- stream
- microfluidic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- G01N1/40—Concentrating samples
- G01N1/4005—Concentrating samples by transferring a selected component through a membrane
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4077—Concentrating samples by other techniques involving separation of suspended solids
- G01N2001/4094—Concentrating samples by other techniques involving separation of suspended solids using ultrasound
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N15/02—Investigating particle size or size distribution
- G01N2015/0288—Sorting the particles
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- G01N15/1404—Fluid conditioning in flow cytometers, e.g. flow cells; Supply; Control of flow
- G01N2015/1409—Control of supply of sheaths fluid, e.g. sample injection control
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- G—PHYSICS
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- G01N2035/00178—Special arrangements of analysers
- G01N2035/00237—Handling microquantities of analyte, e.g. microvalves, capillary networks
- G01N2035/00247—Microvalves
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- 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
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T436/25375—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
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- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T436/00—Chemistry: analytical and immunological testing
- Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
- Y10T436/2575—Volumetric liquid transfer
Definitions
- This invention relates generally to microfluidic devices for performing analytic testing, and, in particular, to a device for reducing the effect of surface tension on fluids flowing in microfluidic channels.
- Microfluidic devices have recently become popular for performing analytic testing. Using tools developed by the semiconductor industry to miniaturize electronics, it has become possible to fabricate intricate fluid systems which can be inexpensively means produced. Systems have been developed to perform a variety of analytical techniques for the acquisition of information for the medical field.
- Microfluidic devices may be constructed in a multi-layer laminated structure where each layer has channels and structures fabricated from a laminate material to form microscale voids or channels where fluid flow.
- a microscale channel is generally defined as a fluid passage which has at least one internal cross-sectional dimension that is less than 500 ⁇ m and typically between about 0.1 ⁇ m and about 500 ⁇ m. The control and pumping of fluids through these channels is affected by either external pressurized fluid forced into the laminate, or by structures located within the laminate.
- U.S. Pat. No. 5,716,852 teaches a method for analyzing the presence and concentration of small particles in a flow cell using diffusion principles.
- This patent discloses a channel cell system for detecting the presence of analyte particles in a sample stream using a laminar flow channel having at least two inlet means which provide an indicator stream and a sample stream, where the laminar flow channel has a depth sufficiently small to allow laminar flow of the streams and length sufficient to allow diffusion of particles of the analyte into the indicator stream to form a detection area, and having an outlet out of the channel to form a single mixed stream.
- This device which is known at a T-Sensor, may contain an external detecting means for detecting changes in the indicator stream.
- This detecting means may be provided by any means known in the art, including optical means such as optical spectroscopy, or absorption spectroscopy of fluorescence.
- U.S. Pat. No. 5,932,100 which patent is also incorporated herein by reference, teaches another method for analyzing particles within microfluidic channels using diffusion principles.
- a mixture of particles suspended in a sample stream enters an extraction channel from one upper arm of a structure, which comprises microchannels in the shape of an “H”.
- An extraction stream (a dilution stream) enters from the lower arm on the same side of the extraction channel and due to the size of the microfluidic extraction channel, the flow is laminar and the streams do not mix.
- the sample stream exits as a by-product stream at the upper arm at the end of the extraction channel, while the extraction stream exits as a product stream at the lower arm.
- particles having a greater diffusion coefficient small particles such as albumin, sugars, and small ions
- the larger particles blood cells
- Particles in the exiting extraction stream may be analyzed without interference from the larger particles.
- This microfluidic structure commonly known as an “H-Filter,” can be used for extracting desired particles from a sample stream containing those particles.
- This invention deals with the passive control of fluids within a microfluidic circuit.
- the passive control is generated by using the natural forces that exist on a microscale, specifically capillarity, which is caused by the attraction or repulsion of a fluid toward certain materials.
- FIG. 1 is a plan view of a microfluidic structure including an H-Filter using the principles of the present invention.
- FIG. 2 is a fragmentary, cross-sectional side view of the microfluidic structure shown in FIG. 1.
- FIG. 1 shows a microfluidic analysis card 10 which contains an H-Filter 12 , which structure is described in detail in U.S. Pat. No. 5,932,100, incorporating the present invention.
- H-Filter 12 includes a first reservoir 14 and a second reservoir 16 .
- An outlet channel 18 of reservoir 14 and an outlet channel 20 of reservoir 16 are both connected to a flow channel 24 at a first end 26 .
- a second end 28 of flow channel 24 is coupled to an exit channel 30 , which is connected to a reservoir 32 and also to an exit channel 34 , which is coupled to a reservoir 36 .
- Reservoir 36 is also coupled to a bellows 38 via a channel 40 . It should be understood that H-Filter 12 will also operate using gravity as a driving force.
- Reservoir 14 contains a vent hole 42 and an inlet port 44 , while reservoir 16 contains an inlet port 46 .
- Reservoir 14 also contains a narrowed lower section 50 , which extends across the lower length of reservoir 14 , while reservoir 16 also contains a similarly narrowed lower section 52 across the lower length of reservoir 16 .
- H-Filter 12 Operation of H-Filter 12 is as follows: a sample fluid is placed into inlet port 46 of reservoir 16 while an extractor solution is placed into port 44 of reservoir 14 .
- the fluids form a stream and flow through channels 20 , 18 respectively to end 26 of channel 24 .
- the fluids form a stream and flow laminarly within channel 24 while particles from the sample fluid diffuse across the laminar junction into the extractor fluid.
- the extractor fluid containing particles flow through channel 30 into reservoir 32 , while the sample fluid flows through channel 34 into reservoir 36 .
- Narrowed section 50 of reservoir 14 fills with sample fluid when the sample is loaded into inlet port 44 . Since the structure of reservoir 14 is not microscale, and outlet channel 18 is of a microscale dimension, the effect of surface tension would generally prevent the fluid from flowing smoothly from reservoir 14 to channel 18 . However, as can be clearly seen in FIGS. 1 and 2, the narrow lower section 50 , which runs the entire length of reservoir 14 , is of essentially the same microdimensions of channel 18 ; thus, fluid moves smoothly and consistently from reservoir 14 into channel 18 and through the rest of the H-Filter structure. This is also true for fluids flowing from reservoir 16 into channel 20 , as the narrow lower section 52 of reservoir 16 fills with fluid and flows smoothly into channel 20 with little or no surface tension effect.
Abstract
A structure for use with a microfluidic channel to reduce the effects of surface tension and capillary forces. A macroscale reservoir is connected to a microscale channel by a microscale section extending from the reservoir, which fills with fluid and flows smoothly into the microscale channel.
Description
- This application claims benefit from U.S. Provisional Patent Application Serial No. 60/281,114, filed Apr. 3, 2001, which application is incorporated herein by reference.
- 1. Field of the Invention
- This invention relates generally to microfluidic devices for performing analytic testing, and, in particular, to a device for reducing the effect of surface tension on fluids flowing in microfluidic channels.
- 2. Description of the Related Art
- Microfluidic devices have recently become popular for performing analytic testing. Using tools developed by the semiconductor industry to miniaturize electronics, it has become possible to fabricate intricate fluid systems which can be inexpensively means produced. Systems have been developed to perform a variety of analytical techniques for the acquisition of information for the medical field.
- Microfluidic devices may be constructed in a multi-layer laminated structure where each layer has channels and structures fabricated from a laminate material to form microscale voids or channels where fluid flow. A microscale channel is generally defined as a fluid passage which has at least one internal cross-sectional dimension that is less than 500 μm and typically between about 0.1 μm and about 500 μm. The control and pumping of fluids through these channels is affected by either external pressurized fluid forced into the laminate, or by structures located within the laminate.
- U.S. Pat. No. 5,716,852 teaches a method for analyzing the presence and concentration of small particles in a flow cell using diffusion principles. This patent, the disclosure of which is incorporated herein by reference, discloses a channel cell system for detecting the presence of analyte particles in a sample stream using a laminar flow channel having at least two inlet means which provide an indicator stream and a sample stream, where the laminar flow channel has a depth sufficiently small to allow laminar flow of the streams and length sufficient to allow diffusion of particles of the analyte into the indicator stream to form a detection area, and having an outlet out of the channel to form a single mixed stream. This device, which is known at a T-Sensor, may contain an external detecting means for detecting changes in the indicator stream. This detecting means may be provided by any means known in the art, including optical means such as optical spectroscopy, or absorption spectroscopy of fluorescence.
- U.S. Pat. No. 5,932,100, which patent is also incorporated herein by reference, teaches another method for analyzing particles within microfluidic channels using diffusion principles. A mixture of particles suspended in a sample stream enters an extraction channel from one upper arm of a structure, which comprises microchannels in the shape of an “H”. An extraction stream (a dilution stream) enters from the lower arm on the same side of the extraction channel and due to the size of the microfluidic extraction channel, the flow is laminar and the streams do not mix. The sample stream exits as a by-product stream at the upper arm at the end of the extraction channel, while the extraction stream exits as a product stream at the lower arm. While the streams are in parallel laminar flow is in the extraction channel, particles having a greater diffusion coefficient (smaller particles such as albumin, sugars, and small ions) have time to diffuse into the extraction stream, while the larger particles (blood cells) remain in the sample stream. Particles in the exiting extraction stream (now called the product stream) may be analyzed without interference from the larger particles. This microfluidic structure, commonly known as an “H-Filter,” can be used for extracting desired particles from a sample stream containing those particles.
- Surface effects describe the character of a surface on a micro scale. Materials often have unbound electrons, exposed polar molecules, or other molecular level features that generate a surface charge or reactivity characteristic. Due to scaling, these surface effects or surface forces are substantially more pronounced in microstructures than they are in traditionally sized devices. This is particularly true in microscale fluid handling systems where the dynamics of fluid movement are governed by external pressures and by attractions between liquids and the materials they are flowing through.
- This invention deals with the passive control of fluids within a microfluidic circuit. The passive control is generated by using the natural forces that exist on a microscale, specifically capillarity, which is caused by the attraction or repulsion of a fluid toward certain materials.
- It is therefore an object of the present invention to provide a device for reducing the effect of surface tension on fluids flowing within a microfluidic channel.
- It is a further object of the present invention to provide a microfluidic structure in which fluids flow from a macrochannel into a microchannel to insure smooth flow within the microfluidic structure.
- These and other objects of the present invention will be more readily apparent from the description and drawings that follow.
- FIG. 1 is a plan view of a microfluidic structure including an H-Filter using the principles of the present invention; and
- FIG. 2 is a fragmentary, cross-sectional side view of the microfluidic structure shown in FIG. 1.
- FIG. 1 shows a
microfluidic analysis card 10 which contains an H-Filter 12, which structure is described in detail in U.S. Pat. No. 5,932,100, incorporating the present invention. H-Filter 12 includes afirst reservoir 14 and asecond reservoir 16. Anoutlet channel 18 ofreservoir 14 and anoutlet channel 20 ofreservoir 16 are both connected to aflow channel 24 at afirst end 26. Asecond end 28 offlow channel 24 is coupled to anexit channel 30, which is connected to areservoir 32 and also to anexit channel 34, which is coupled to areservoir 36.Reservoir 36 is also coupled to abellows 38 via achannel 40. It should be understood that H-Filter 12 will also operate using gravity as a driving force. -
Reservoir 14 contains a vent hole 42 and aninlet port 44, whilereservoir 16 contains aninlet port 46.Reservoir 14 also contains a narrowedlower section 50, which extends across the lower length ofreservoir 14, whilereservoir 16 also contains a similarly narrowedlower section 52 across the lower length ofreservoir 16. - Operation of H-
Filter 12 is as follows: a sample fluid is placed intoinlet port 46 ofreservoir 16 while an extractor solution is placed intoport 44 ofreservoir 14. The fluids form a stream and flow throughchannels channel 24. The fluids form a stream and flow laminarly withinchannel 24 while particles from the sample fluid diffuse across the laminar junction into the extractor fluid. As the stream reachesend 28 ofchannel 24, the extractor fluid containing particles flow throughchannel 30 intoreservoir 32, while the sample fluid flows throughchannel 34 intoreservoir 36. - Narrowed
section 50 ofreservoir 14 fills with sample fluid when the sample is loaded intoinlet port 44. Since the structure ofreservoir 14 is not microscale, andoutlet channel 18 is of a microscale dimension, the effect of surface tension would generally prevent the fluid from flowing smoothly fromreservoir 14 tochannel 18. However, as can be clearly seen in FIGS. 1 and 2, the narrowlower section 50, which runs the entire length ofreservoir 14, is of essentially the same microdimensions ofchannel 18; thus, fluid moves smoothly and consistently fromreservoir 14 intochannel 18 and through the rest of the H-Filter structure. This is also true for fluids flowing fromreservoir 16 intochannel 20, as the narrowlower section 52 ofreservoir 16 fills with fluid and flows smoothly intochannel 20 with little or no surface tension effect. - While the present invention has been shown and described in terms of a preferred embodiment thereof, it will be understood that this invention is not limited to this particular embodiment and that changes and modifications may be made without departing from the true spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. A microfluidic device, comprising:
a first fluid vessel having only macrofluidic dimensions;
a second fluid vessel having at least one microfluidic dimension;
a microfluidic channel having first and second ends, said first end attached to at least one portion of at least one side of said first fluid vessel and said second end attached to at least one portion of at least one side of said second fluid vessel such that said attachment to said first vessel is larger in at least one dimension than said attachment to said vessel.
Priority Applications (1)
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US10/114,864 US20020150502A1 (en) | 2001-04-03 | 2002-04-03 | Surface tension reduction channel |
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US28111401P | 2001-04-03 | 2001-04-03 | |
US10/114,864 US20020150502A1 (en) | 2001-04-03 | 2002-04-03 | Surface tension reduction channel |
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US10/115,374 Abandoned US20020159920A1 (en) | 2001-04-03 | 2002-04-03 | Multiple redundant microfluidic structures cross reference to related applications |
US10/114,790 Expired - Lifetime US6674525B2 (en) | 2001-04-03 | 2002-04-03 | Split focusing cytometer |
US10/114,864 Abandoned US20020150502A1 (en) | 2001-04-03 | 2002-04-03 | Surface tension reduction channel |
US10/114,890 Abandoned US20020148992A1 (en) | 2001-04-03 | 2002-04-03 | Pneumatic valve interface for use in microfluidic structures |
US10/114,765 Abandoned US20020172622A1 (en) | 2001-04-03 | 2002-04-03 | Microfluidic device for concentrating particles in a concentrating solution |
US10/960,890 Abandoned US20050205816A1 (en) | 2001-04-03 | 2004-10-06 | Pneumatic valve interface for use in microfluidic structures |
US11/122,139 Abandoned US20050201903A1 (en) | 2001-04-03 | 2005-05-04 | Microfluidic device for concentrating particles in a concentrating solution |
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US10/115,374 Abandoned US20020159920A1 (en) | 2001-04-03 | 2002-04-03 | Multiple redundant microfluidic structures cross reference to related applications |
US10/114,790 Expired - Lifetime US6674525B2 (en) | 2001-04-03 | 2002-04-03 | Split focusing cytometer |
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US10/114,890 Abandoned US20020148992A1 (en) | 2001-04-03 | 2002-04-03 | Pneumatic valve interface for use in microfluidic structures |
US10/114,765 Abandoned US20020172622A1 (en) | 2001-04-03 | 2002-04-03 | Microfluidic device for concentrating particles in a concentrating solution |
US10/960,890 Abandoned US20050205816A1 (en) | 2001-04-03 | 2004-10-06 | Pneumatic valve interface for use in microfluidic structures |
US11/122,139 Abandoned US20050201903A1 (en) | 2001-04-03 | 2005-05-04 | Microfluidic device for concentrating particles in a concentrating solution |
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US6674525B2 (en) | 2004-01-06 |
US20050205816A1 (en) | 2005-09-22 |
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EP1377811B1 (en) | 2008-07-16 |
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WO2002081934A9 (en) | 2002-11-28 |
WO2002082057A2 (en) | 2002-10-17 |
JP3949056B2 (en) | 2007-07-25 |
DE60227649D1 (en) | 2008-08-28 |
US20020148992A1 (en) | 2002-10-17 |
WO2002082057A3 (en) | 2003-02-13 |
EP1377821A2 (en) | 2004-01-07 |
US20020159920A1 (en) | 2002-10-31 |
ATE401566T1 (en) | 2008-08-15 |
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