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US20020150502A1 - Surface tension reduction channel - Google Patents

Surface tension reduction channel Download PDF

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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
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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
Application number
US10/114,864
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English (en)
Inventor
Bernhard Weigl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Revvity Health Sciences Inc
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US10/114,864 priority Critical patent/US20020150502A1/en
Publication of US20020150502A1 publication Critical patent/US20020150502A1/en
Assigned to MICRONICS, INC. reassignment MICRONICS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEIGL, BERNHARD H.
Assigned to PERKINELMER HEALTH SCIENCES, INC. reassignment PERKINELMER HEALTH SCIENCES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MICRONICS, INC.
Abandoned legal-status Critical Current

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    • G01N2001/4016—Concentrating samples by transferring a selected component through a membrane being a selective membrane, e.g. dialysis or osmosis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/40—Concentrating samples
    • G01N1/4055—Concentrating samples by solubility techniques
    • G01N2001/4061—Solvent extraction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N2015/0288—Sorting the particles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1404—Handling flow, e.g. hydrodynamic focusing
    • G01N15/1409—Handling samples, e.g. injecting samples
    • G01N2015/1411—Features of sheath fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1404—Handling flow, e.g. hydrodynamic focusing
    • G01N2015/1413—Hydrodynamic focussing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1434—Optical arrangements
    • G01N2015/144—Imaging characterised by its optical setup
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N2015/1486—Counting the particles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
    • G01N2035/00178—Special arrangements of analysers
    • G01N2035/00237—Handling microquantities of analyte, e.g. microvalves, capillary networks
    • G01N2035/00247—Microvalves
    • 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
    • Y10T436/25375—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
    • 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.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Hematology (AREA)
  • Clinical Laboratory Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fluid Mechanics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Emergency Medicine (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Molecular Biology (AREA)
  • Urology & Nephrology (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Check Valves (AREA)
  • External Artificial Organs (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Multiple-Way Valves (AREA)
US10/114,864 2001-04-03 2002-04-03 Surface tension reduction channel Abandoned US20020150502A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/114,864 US20020150502A1 (en) 2001-04-03 2002-04-03 Surface tension reduction channel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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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US10/114,864 Abandoned US20020150502A1 (en) 2001-04-03 2002-04-03 Surface tension reduction channel
US10/114,765 Abandoned US20020172622A1 (en) 2001-04-03 2002-04-03 Microfluidic device for concentrating particles in a concentrating solution
US10/114,790 Expired - Lifetime US6674525B2 (en) 2001-04-03 2002-04-03 Split focusing cytometer
US10/115,320 Abandoned US20020160518A1 (en) 2001-04-03 2002-04-03 Microfluidic sedimentation
US10/114,890 Abandoned US20020148992A1 (en) 2001-04-03 2002-04-03 Pneumatic valve interface for use in microfluidic structures
US10/115,374 Abandoned US20020159920A1 (en) 2001-04-03 2002-04-03 Multiple redundant microfluidic structures cross reference to related applications
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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US10/114,765 Abandoned US20020172622A1 (en) 2001-04-03 2002-04-03 Microfluidic device for concentrating particles in a concentrating solution
US10/114,790 Expired - Lifetime US6674525B2 (en) 2001-04-03 2002-04-03 Split focusing cytometer
US10/115,320 Abandoned US20020160518A1 (en) 2001-04-03 2002-04-03 Microfluidic sedimentation
US10/114,890 Abandoned US20020148992A1 (en) 2001-04-03 2002-04-03 Pneumatic valve interface for use in microfluidic structures
US10/115,374 Abandoned US20020159920A1 (en) 2001-04-03 2002-04-03 Multiple redundant microfluidic structures cross reference to related applications
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

Country Status (6)

Country Link
US (8) US20020150502A1 (fr)
EP (2) EP1377821A2 (fr)
JP (2) JP3949056B2 (fr)
AT (1) ATE401566T1 (fr)
DE (1) DE60227649D1 (fr)
WO (2) WO2002081934A2 (fr)

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US20020148992A1 (en) 2002-10-17
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US20020149766A1 (en) 2002-10-17
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US20020172622A1 (en) 2002-11-21

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