EP1827694A1 - Dispositif de dispense de gouttes - Google Patents
Dispositif de dispense de gouttesInfo
- Publication number
- EP1827694A1 EP1827694A1 EP05848241A EP05848241A EP1827694A1 EP 1827694 A1 EP1827694 A1 EP 1827694A1 EP 05848241 A EP05848241 A EP 05848241A EP 05848241 A EP05848241 A EP 05848241A EP 1827694 A1 EP1827694 A1 EP 1827694A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- electrodes
- reservoir
- drop
- liquid
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims abstract description 77
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 20
- 238000000203 droplet dispensing Methods 0.000 claims description 8
- 230000005661 hydrophobic surface Effects 0.000 claims description 7
- 230000004913 activation Effects 0.000 claims description 6
- 230000009849 deactivation Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000002209 hydrophobic effect Effects 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- 244000261422 Lysimachia clethroides Species 0.000 description 3
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- 238000003892 spreading Methods 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
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- 238000005520 cutting process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 201000005569 Gout Diseases 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/502769—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements
- B01L3/502784—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements specially adapted for droplet or plug flow, e.g. digital microfluidics
- B01L3/502792—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements specially adapted for droplet or plug flow, e.g. digital microfluidics for moving individual droplets on a plate, e.g. by locally altering surface tension
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
- F04B19/006—Micropumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/06—Fluid handling related problems
- B01L2200/0605—Metering of fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0809—Geometry, shape and general structure rectangular shaped
- B01L2300/0816—Cards, e.g. flat sample carriers usually with flow in two horizontal directions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/089—Virtual walls for guiding liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/0415—Moving fluids with specific forces or mechanical means specific forces electrical forces, e.g. electrokinetic
- B01L2400/0427—Electrowetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/0241—Drop counters; Drop formers
Definitions
- the invention relates to a device and a method for forming drops or small volumes of liquid from a liquid reservoir, using electrostatic forces.
- the invention particularly relates to a liquid dispensing device that can be applied in discrete microfluidic, or microfluidic drop, for example for chemical or biological applications.
- the invention applies to the formation of drops in devices, for biochemical, chemical or biological analysis, whether in the medical field, or in environmental monitoring, or in the field of quality control.
- One of the most used modes of movement or manipulation is based on the principle of electrowetting on a dielectric, as described in the article by MG Pollack, AD Shendorov, RB Fair, entitled “Electro-wetting-based actuation of droplets for integrated microfluidics ", Lab Chip 2 (1) (2002), pp. 96-101.
- the forces used for displacement are electrostatic forces.
- the document FR 2 841 063 describes a device implementing a catenary opposite electrodes activated for displacement.
- a drop 2 rests on a network 4 of electrodes, from which it is isolated by a dielectric layer 6 and a hydrophobic layer 8 (FIG. 1A), all resting on a substrate 9.
- Each electrode is connected to a common electrode via a switch , or rather an individual electrical relay control system 11.
- the counterelectrode 10 may be either a catenary as described in FR-2 841 063 or a buried wire or a planar electrode on a hood in the case of a confined system.
- the forces of electrostatic origin are superimposed on the wetting forces which causes the spreading of the drop on the surface.
- the surface is rendered hydrophilic.
- the drop can thus be displaced step by step (FIG. 1C) on the hydrophobic surface 8 by successive activation of the electrodes 4-1, 4-2, etc. and along the catenary 10.
- the drops rest on the surface of a substrate comprising the matrix of electrodes, as illustrated in FIG. 1A and as described in document FR 2 841 063.
- a second family of embodiments consists in confining the drop between two substrates, as explained for example in the document by MG POLLAK et al already cited above.
- the system generally consists of a chip and a control system.
- the chips have electrodes as described above.
- the electrical control system comprises a set of relays and a PLC or a PC for programming the switching of the relays.
- the chip is electrically connected to the control system, so each relay can control one or more electrodes. Thanks to the relays, all the electrodes can be placed at a potential VO or Vl.
- the liquid segment obtained is cut off by deactivating one of the activated electrodes (electrode Ec in FIG. 2C). A drop 22 is thus obtained, as illustrated in FIG. 2D.
- This method can be applied by inserting electrodes between the reservoir R and one or more electrodes Ec (FIG. 2C), called the breaking electrode.
- FIGS. 3A-3D Applied to the confined configuration explained above, this principle leads to a configuration of a drop dispensing device, as illustrated in FIGS. 3A-3D.
- a liquid to be dispensed is deposited in a well 35 of this device (FIG. 3A).
- This well is for example made in the upper cover 36 of the device.
- the lower part is similar to the structure of Figures 1A-1C. So we use a series of electrodes 31 to stretch ( Figures 3B and 3C) and then to cut liquid finger (FIG. 3D) as explained above with reference to FIGS. 2A-2D.
- the disadvantage of this method is its non-reproducibility. Indeed the fluidic mechanisms during the formation of the finger as well as the cutting of the finger are unfortunately very influenced by the pressure in the well 35. As the well empties, the pressure in it changes (the shape meniscus in the well can influence the capillary pressure, and the liquid height can also modify the hydrostatic pressure) and the drops formed do not have a constant volume.
- the invention relates first of all to a liquid dispensing device, of the confined type, comprising a first and a second substrate, the second substrate being provided with a fluid introduction opening, the first substrate being provided with a plurality of electrodes, of which:
- the reservoir electrode located between the transfer electrode and the drop formation electrodes, or associated with the transfer electrode and with the drop forming electrodes, and having a surface area of at least equal to 3 times the area of each drop forming electrode.
- the device may further comprise at least one second reservoir electrode and at least one second transfer electrode located between two adjacent reservoir electrodes, at least two drop forming electrodes being associated with each reservoir electrode.
- the device may further comprise at least one second reservoir electrode, and at least one second transfer electrode located at least partially opposite the opening and at least two drop forming electrodes associated with the second reservoir electrode.
- at least one second reservoir electrode, or each reservoir electrode has a surface at least equal to 3 times the area of each drop-forming electrode of the drop-forming electrodes associated therewith.
- the invention therefore also relates to a liquid dispensing device, of the confined type, comprising a first and a second substrate, the second substrate being provided with an opening for introducing a fluid, the first substrate being provided with a plurality of electrodes, of which:
- transfer electrodes of which at least a part is situated at least partially opposite the opening, and of reservoir electrodes, a series of drop-forming electrodes associated with each reservoir electrode , at least one of the reservoir electrodes having an area at least equal to 3 times the area of each drop forming electrode of the series of drop forming electrodes associated with this reservoir electrode.
- the invention also relates to a liquid dispensing device, of the confined type, comprising a first and a second substrate, the second substrate being provided with an opening for introducing a fluid, the first substrate being provided with a plurality of electrodes, including:
- each transfer electrode being situated at least partially opposite the opening, and a plurality of reservoir electrodes, each reservoir electrode being associated with a transfer electrode ,
- drop delivery systems comprising a plurality of reservoir electrodes each associated with a series of drop-forming electrodes, the reservoir electrodes being: - arranged in series from a liquid supply opening, and alternating with transfer electrodes,
- At least one reservoir electrode has a surface at least 3 times or 10 times or 20 times the area of each drop forming electrode.
- At least one reservoir electrode has a comb shape, the teeth of which can be tapered on the side of the transfer electrode.
- At least one reservoir electrode has a star shape.
- a device may comprise a confinement wall between a reservoir electrode and the opening, or even a confinement wall around at least one reservoir electrode.
- One of the drop forming electrodes advantageously has a rounded shape on one side and a pointed one on the other, thus favoring the drop ejection mechanism minimizing the dependence on the nature of the liquids and the parameters of use. of the device.
- the first substrate may include conductive means to form a counter electrode.
- This first substrate may also have a hydrophobic surface.
- the second substrate may also have a hydrophobic surface, and optionally a dielectric layer under the hydrophobic surface.
- the invention also relates to a method for forming a liquid reservoir, from a liquid well comprising:
- the pressure in the liquid reservoir can be made independent of the pressure of the liquid in the well by deactivation of the transfer electrode after formation of the liquid volume.
- the invention also relates to a liquid drop dispensing method comprising a method of forming a liquid reservoir as described above, and the formation of a drop of liquid by activation of at least n electrodes for forming a liquid droplet. drops, n;> 2, then deactivating at least one of these electrodes among the n-1 electrodes closest to the reservoir electrode, in order to pinch a finger of liquid.
- the invention also relates to a liquid drop dispensing method implementing a device as described above, the formation of a liquid reservoir facing or above the reservoir electrode or at least two tank electrodes, and ejecting a drop of liquid through activation of n drop forming electrodes, n>; 2, then deactivating at least one of these electrodes from the n-1 electrodes closest to the reservoir electrode for which a reservoir is formed.
- FIGS. 1A-1C illustrate the principle of manipulation of a drop by electrowetting on an insulator
- FIGS. 2A-2D represent steps of a known method for producing a drop on an electrode line
- FIGS. 3A-3D show a device of the prior art
- FIGS. 4A and 4B show an exemplary embodiment of a device according to the invention
- FIGS. 5A-5B are examples of variants of a device according to the invention.
- FIGS. 6A-6B are examples of other variants of a device according to the invention.
- FIGS. 7A-7C illustrate yet another example of variants of a device according to the invention.
- FIGS. 8A and 8B illustrate yet another example of application of a device according to the invention.
- FIGS. 9A and 9B show two structures of devices according to the invention. DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS
- FIGS. 4A and 4D A first embodiment of the invention is illustrated in FIGS. 4A and 4D, respectively in plan view and in side view.
- FIG. 4A represents in fact only the electrode system implemented in a device for dispensing calibrated drops according to the invention.
- This well is placed at least partially in front of a transfer electrode 44, which is in fact formed in the substrate 46 of the device.
- a reservoir electrode 48 which will allow to define a liquid holding micro-reservoir.
- a counter electrode 47 is disposed in the cover 42.
- the invention therefore proposes the organization of a series of electrodes in a drop dispensing device, these electrodes having different functions, a series of drop-forming electrodes and a transfer electrode being associated with each reservoir electrode.
- the reservoir electrode is located between the transfer electrode and the formation electrodes drops, but other configurations are possible, as shown in Figures 8A and 8B.
- the first electrode 44 is used to pump the liquid from the reservoir and bring it near the second electrode 48, said reservoir electrode.
- this reservoir electrode can be accumulated a certain amount of liquid. It is shown as having a square or rectangular shape in Figure 4A, but its shape can be any. Preferably, it can accumulate at least three to four times the volume of drops to be dispensed, and preferably at least 10 times or 20 times the volume of each drop dispensed. As the distance between the two substrates
- the transfer electrode when activated, makes it possible to bring a portion of liquid, located in the well 40, close to the reservoir electrode 48.
- the liquid is transferred into the area of the device located above the reservoir electrode 48. If it is desired to continue feeding the zone situated above the tank 48, it is possible to reactivate the electrode 44, then the electrode 48, so as to continue to accumulate liquid in this reservoir zone.
- the drops that can then be formed using the electrodes 50-56 will themselves be independent of the pressure of the liquid in the well 40.
- the transfer electrode 44 is not activated, the liquid defined by the reservoir electrode 48 is not in contact with the well 40.
- the ejection or the drop dispensation that can be made from the liquid stored above the electrode 48 can therefore be performed in a calibrated manner, while using a well 40, and independently of the pressure therein, to fill the component.
- the user fills the well 40 with the liquid to be dispensed in the microfluidic component.
- the electrical control of the different electrodes is then controlled and controlled by an electric controller or a PC, which drives relays assigned to each of the electrodes.
- the different sequences can be the following:
- step 5 By repeating step 5, several drops can be made.
- the reservoir electrode is empty, or is no longer sufficiently filled, it is possible to start a new cycle (steps 1 to 5) again to repel the liquid in the well 40 and bring it to the level of the reservoir electrode thanks to the 44 transfer electrode, etc.
- the device comprises at least two forming electrodes, but other electrodes may be provided for handling the drops in the microsystem (electrodes 54, 56 in dashed lines in FIG. 4A).
- the volume of the well is defined by its diameter (or section) and by its height.
- the height of the well may be of the order of a millimeter to a few millimeters, for example between 1 mm and 10 mm.
- confinement means for example in the form of walls 60, to better confine the liquids.
- the spacer can be a thick layer of resin whose shape can be structured: for example by using a layer of photoresist (SU8, ordyl ...) and defining the patterns by photolithography.
- SU8 ordyl photoresist
- a wall is made with an opening 61 between the reservoir electrode 48 and the well 40).
- This first pattern makes it possible to ensure that the liquid of the reservoir electrode 48 does not rise towards the well 40, which is explained by the capillarity forces: the narrowing acts as a dam as long as the surfaces are non-wetting. that is to say, as long as there is no activation by the electrodes.
- the surfaces of the walls 60 are preferably rendered hydrophobic.
- FIGS. 5A and 5B are seen from above in FIGS. 5A and 5B, but are located between the two substrates 42, 46 of the device.
- the shape of the reservoir electrode 48 so as to constantly press or attract the liquid towards the drop formation electrodes 50 and 56 and to always allow the initiation of the finger formation process to take place.
- liquid when dispensing with gout for example, as illustrated in FIGS. 6A and 6B, an electrode 48 can be used. Comb or Vi-star shape to ensure an electrode surface gradient. It is also possible, as illustrated in FIGS. 9A and 9B, to use a tip-shaped electrode 481. Indeed, 1 electrowetting on insulator has the effect of spreading the liquid at the activated electrodes, which is reflected here by a liquid position to maximize the surface facing the electrode. This results in a "collecting" effect of the liquid near the first drop forming electrode 50.
- This improvement also makes it possible to empty the tank completely.
- the fingers of the comb ( Figure 6A) or the half-star ( Figure 6B) or the tip ( Figures 9A, 9B) may be square or pointed.
- the transfer electrode 44 has a shape adapted to bring the liquid to the reservoir electrode 48.
- This variant is shown in FIGS. 6A and 6B with the confinement means 62 defining a cavity but can be implemented without these means, or simply with the wall 60 of Figure 5A.
- it is also possible to improve the reproducibility of the volume of the drops by optimizing the shape of the drop formation electrodes 50-56, as illustrated in FIGS. Figures 7A-7C.
- the finger is cut to form a new drop.
- the future drop has a pointed shape on one side, and is rather spherical or angular on the other ( Figure 7B).
- the spherical or angular shape is explained by the competition between the capillary forces and the effect of electrowetting on a square electrode. In the end, the volume of the drop depends very much on the values of the surface tension and the value of the voltage applied to the electrodes.
- the finger takes a shape gooseneck.
- This gooseneck geometry can also depend on a certain number of parameters such as the surface tension, the values of the voltage applied to the electrodes, as well as the geometry of the cutoff electrode.
- a drop forming electrode can be defined by a shape limiting angle effects on one side, and controlling the shape of the gooseneck. This is obtained by producing an electrode, for example the electrode 54, in the form of a "drop": it is round on one side 54-1 and pointed on the other side 54-2, as shown in FIG. 7A.
- FIGS. 8A and 8B Another example of application is illustrated in Figures 8A and 8B, schematically in top view.
- the upper substrate providing confinement and in which the well is formed, is not shown. Only the distribution of the transfer electrodes, the reservoir electrodes and the drop forming electrodes is represented.
- a well 100 supplies a plurality of reservoir electrodes 104, 106, 108, 110 according to the invention, via transfer electrodes 101, 103, 105, 107.
- drop forming electrodes At the outlet of each reservoir electrode are arranged drop forming electrodes generally designated by references 154, 156, 158, 160.
- Each series of forming electrodes is associated with a reservoir electrode.
- the tanks 104, 106, 108, 110 are arranged in series from the well and the drops are formed in parallel from each tank.
- a well 200 supplies in parallel a plurality of reservoir electrodes 204, 206, 208 according to the invention, via transfer electrodes 201, 203, 205. At the outlet of each reservoir electrode, electrodes are arranged. Drop forming generally designated by references 254, 256, 258. Again, each series of forming electrodes is associated with a reservoir electrode.
- the tanks 204, 206, 208 are arranged in parallel with the well, and the drops are formed in parallel from each tank.
- the electrical control of the different electrodes can be controlled by a electric controller or a PC, which drives relays assigned to each of the electrodes.
- Figs. 8A and 8B may be combined with one or more of the embodiments of Figs. 5A-7C.
- One or more of the reservoir electrodes may be provided with confinement means, as in Figs. 5A and 5B, and / or have a shape as shown in Figs. 6A-6B, while one or more of the drops may have a shape as illustrated in Figure 7A.
- the buried electrodes are obtained by depositing and then etching a thin layer of a metal chosen from Au, Al, Ito, Pt, Cu, Cr, ... by means of conventional microtechnologies microelectronics.
- the thickness of the electrodes is from a few tens of nm to a few microns, for example between 10 nm and 1 ⁇ m.
- the width of the pattern is from a few ⁇ m to a few mm (flat electrodes) for the electrodes 50-56 and the transfer electrode 44.
- the two substrates 42, 46 are typically spaced apart by a distance of, for example, 10 ⁇ m and 100 ⁇ m or 500 ⁇ m. Whatever the embodiment considered, a drop ejected liquid 22 will have a volume between, for example, a few picoliters and a few microliters, for example between 1 or 10 pi and 5 .mu.l or 10 .mu.l.
- 152, 154, 250, 252, 254 has for example a surface of the order of a few tens of ⁇ m 2 (for example 10 ⁇ m 2 ) up to 1 mm 2 , depending on the size of the drops to be transported, the spacing between adjacent electrodes being for example between 1 micron and 10 microns.
- the structuring of the electrodes can be obtained by conventional methods of micro ⁇ technologies, for example by photolithography.
- the electrodes are for example made by depositing a metal layer (Au, Al, ITO, Pt, Cr, Cu, ...) by photolithography.
- a deposit of a hydrophobic layer is performed, such as a teflon deposit made by spinning.
- Conductors and in particular buried catenaries, may be made by depositing a conductive layer and etching this layer in the appropriate pattern of conductors, before deposition of the hydrophobic layer.
- Each of the different electrodes is connected to a relay means to bring it to a potential defined by a voltage source.
- the whole is controlled by an electric automaton or a PC. Examples of chip structures according to the invention are given in FIGS. 9A and 9B.
- the chips measure 13mm by 13mm, and the drop displacement electrodes measure 800 ⁇ m per 800 ⁇ m.
- the hatched discs 350, 352, 354, 356, 358 (FIG. 9A) 351, 353, 355 (FIG. 9B) represent the location of the holes in the hood (the wells).
- the disk 360 represents a trash zone.
- a main tank 400 - according to the invention opening on a first electrode line 255, whose left end opens to the trash zone 360. Through this line, drops of liquids can be removed and transported by electrowetting from the main tank 400.
- FIGS. 9A and 9B are two chip structures showing different shapes and arrangements of the tanks 350, 352, 354, 356 and 351,
- the chip of Figure 9A has 4 secondary tanks 350, 352, 354, 356 open on the outside by wells.
- the chip of Figure 9B has 3 secondary tanks 351, 353, 355 open on the outside by wells.
- Each reservoir is associated with a set of electrodes 360, 362, 364, 366 and 361, 363 which make it possible to bring one or more drops from the corresponding reservoir to the path 402.
- a section 257 also formed of electrodes allows to link the path 255 and the loop 402.
- the references 410, 411 represent zones or addressing pads of the electrodes which constitute the paths 255, 402 and electrodes located at the outlet of the different reservoirs. These zones or pads may themselves be controlled by electronic or computer means.
- the tanks are configured and used according to the invention: they comprise a series of electrodes for confining a volume of liquid at a reservoir electrode from a well to allow reproducible dispensing drops.
- the tanks comprise containment means 480, 481 (tank electrodes) star or tip, arranged, according to the invention, downstream of the transfer electrodes from the tank.
- a drop dispensing method according to the invention can implement a device as described in connection with Figures 9A and 9B.
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Clinical Laboratory Science (AREA)
- Hematology (AREA)
- General Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Micromachines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0453211A FR2879946B1 (fr) | 2004-12-23 | 2004-12-23 | Dispositif de dispense de gouttes |
PCT/FR2005/051131 WO2006070162A1 (fr) | 2004-12-23 | 2005-12-22 | Dispositif de dispense de gouttes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1827694A1 true EP1827694A1 (fr) | 2007-09-05 |
EP1827694B1 EP1827694B1 (fr) | 2013-02-20 |
Family
ID=34953970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05848241A Active EP1827694B1 (fr) | 2004-12-23 | 2005-12-22 | Dispositif de dispense de gouttes |
Country Status (5)
Country | Link |
---|---|
US (1) | US7922886B2 (fr) |
EP (1) | EP1827694B1 (fr) |
JP (1) | JP4824697B2 (fr) |
FR (1) | FR2879946B1 (fr) |
WO (1) | WO2006070162A1 (fr) |
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- 2005-12-22 WO PCT/FR2005/051131 patent/WO2006070162A1/fr active Application Filing
- 2005-12-22 JP JP2007547602A patent/JP4824697B2/ja active Active
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US7922886B2 (en) | 2011-04-12 |
JP4824697B2 (ja) | 2011-11-30 |
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WO2006070162A1 (fr) | 2006-07-06 |
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