EP1663495A1 - Dispositif de pipettage a canaux multiples - Google Patents

Dispositif de pipettage a canaux multiples

Info

Publication number
EP1663495A1
EP1663495A1 EP04764496A EP04764496A EP1663495A1 EP 1663495 A1 EP1663495 A1 EP 1663495A1 EP 04764496 A EP04764496 A EP 04764496A EP 04764496 A EP04764496 A EP 04764496A EP 1663495 A1 EP1663495 A1 EP 1663495A1
Authority
EP
European Patent Office
Prior art keywords
pipetting
micromembrane
pump
pumps
channel
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.)
Withdrawn
Application number
EP04764496A
Other languages
German (de)
English (en)
Inventor
Hans-Jürgen BIGUS
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.)
Hirschmann Laborgerate & Co KG GmbH
Hirschmann Laborgerate GmbH and Co KG
Original Assignee
Hirschmann Laborgerate & Co KG GmbH
Hirschmann Laborgerate GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hirschmann Laborgerate & Co KG GmbH, Hirschmann Laborgerate GmbH and Co KG filed Critical Hirschmann Laborgerate & Co KG GmbH
Publication of EP1663495A1 publication Critical patent/EP1663495A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
    • G01N35/1065—Multiple transfer devices
    • G01N35/1072—Multiple transfer devices with provision for selective pipetting of individual channels
    • 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
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive
    • F04B43/043—Micropumps
    • 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
    • B01L2400/0433—Moving fluids with specific forces or mechanical means specific forces vibrational forces
    • B01L2400/0439—Moving fluids with specific forces or mechanical means specific forces vibrational forces ultrasonic vibrations, vibrating piezo elements
    • 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
    • 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
    • G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
    • G01N35/1065—Multiple transfer devices
    • G01N35/1074—Multiple transfer devices arranged in a two-dimensional array

Definitions

  • the invention relates to a pipetting device with a dosing head with a plurality of pipetting channels, which are arranged in one or more rows or in a matrix-like manner in several rows and columns and can be connected at the end to a pipette tip, each pipetting channel for the metered suction and / or dispensing of At least one separate micromembrane pump is assigned to fluids, which is constructed from a plurality of essentially disk-shaped microstructures arranged one above the other, at least two of which form a pump chamber between them and at least one of which has the membrane deformable by an actuating element. It is also directed to a dosing head of such a pipetting device and to a computer program product for controlling such a pipetting device.
  • pipettes In laboratory technology, pipettes have a wide range of applications for precise dosing of defined liquid volumes. In addition to single pipettes with a pipetting channel, multi-channel pipettes are used for large test series. You assign a manual or motorized instruction driven and usually an adjustable volume. Fixed volume pipettes are also known.
  • Pipettes work either according to the direct displacement principle or via an interposed air cushion.
  • the former are used in particular when dosing liquids with high vapor pressure, high viscosity and high density.
  • pipettes which work with electrically controllable micromembrane pumps have been used more recently (EP 0 725 267 A2, EP 0 865 824 AI). They enable extremely precise dosing up to a dosing volume of a few nanometers (nm).
  • Multi-channel pipettes with a plurality of pipetting channels arranged in one or more rows or in a matrix-like manner in several rows or columns are known.
  • the distance between the pipetting channels or the pipette tips that can be placed thereon is generally standardized and in particular to the
  • the dimensions of the receptacles of standardized microtiter plates are adapted, which, for example in the case of a standardized microtiter plate with 12 rows and 8 columns (a total of 96 receptacles) is 9 mm, a plate with 16 x 24 (a total of 384 receptacles) 4.5 mm and a plate with 32 x 48 (a total of 1536 pictures) 2.25 mm etc.
  • Multi-channel pipettes are also known on the one hand in the form of reciprocating piston pipettes, the reciprocating pistons of the pipetting channels being assigned a common drive element in order to be able to meter the same fluid volume from all pipetting channels together.
  • a pump which is operatively connected to the pipetting channels and which can be programmed by means of a data processing device, so that an automated dosing sieren with predetermined fluid volumes is possible.
  • a particular disadvantage is that with the known multichannel pipettes, only the same fluid volume can be metered out of all pipetting channels.
  • a grading of the metering volumes can be achieved by grading the piston diameter or the diameter of the pipette tips or the pipetting channels in which the reciprocating pistons are guided, but it is also possible in this way to set any metering volume individually lumens are not possible and there are limits to the dosing volume with such pipettes.
  • EP 0 993 869 A2 describes a pipetting device in which the pipetting channel is operatively connected to two micromembrane pumps. A pressure-side connection of the one and a suction-side connection of the other micromembrane pump is connected to the pipetting channel in order to ensure precise suction and metering of media separately from one another by corresponding activation of the respective pump.
  • the publication leaves open how the precise actuation of the micromembrane pumps takes place.
  • the object of the invention is to provide a pipetting device or a dosing head of such a pipetting device for a simpler and more cost-effective construction while ensuring a high level of user-friendliness. It is also directed to a computer program product for controlling such a pipetting device.
  • the first part of this object is achieved in a pipetting device or a dosing head of such a pipetting device in that at least some of the micromembrane pumps of different pipetting channels are connected to one another in a material-locking manner, and in that the micromembrane pumps of each pipetting channel are electronically connected
  • Data processing unit can be programmed separately from one another, so that the metering volume of each micromembrane pump can be set separately from one another.
  • micromembrane pumps The configuration of the micromembrane pumps according to the invention enables the pipetting device to be manufactured extremely simply and inexpensively compared to the prior art, it being possible to manufacture the micromembrane pumps by using larger disks or platelets (known as “wafers”) using a microtechnical material shaping known as such. of the microstructures forming the pumps.
  • wafers disks or platelets
  • microtechnical material shaping known as such.
  • the creation of the microstructures on the plates to form a membrane, valves, connections etc. can be carried out in a manner known per se by thermal oxidation, photolithography, anisotropic shape etching etc.
  • Such a substrate then contains the structures of a large number of micromembrane pumps, the distance between the shapes of the microstructures to be carried out on the wafer being adaptable to the desired distance between the pipetting channels - in particular the distance between the receptacles of a standardized microtiter plate - so that a plurality of Micro-diaphragm pumps connected to one another in a material-locking manner are obtained which, although they consist of common platelets or wafers provided with microstructures, can be controlled arbitrarily and in particular independently of one another by means of the actuating elements which can be programmed separately from one another.
  • the installation of such units of micromembrane pumps in the pipetting device is considerably simpler than in the case of individual micromembrane pumps, since the pump assembly, the pumps of which, in particular, have a distance corresponding to the hole spacing of a microtiter plate, are inserted together into the device and to the connecting channels opening into the pipetting channels the pipette can be connected together.
  • the pump units can also be arranged interchangeably in the pipetting device, so that in the event of failure of only one micromembrane pump, the respective pump unit can be replaced.
  • the configuration of the multi-channel pipetting device according to the invention also makes it possible to set any dosing volume on each pipetting channel independently of one another, so that chemical, biological, biochemical or medical analyzes and / or syntheses can be carried out automatically and individually.
  • the micro diaphragm pumps guarantee an exact working method up to a dosing volume of a few n. Because the pumps can be programmed separately from one another by means of the electronic data processing unit, the individual metering volumes can be set separately from one another in advance, so that the pumps can be preprogrammed and an extremely effective operation of the pipetting device is ensured, with the saving of operating personnel compared to the prior art.
  • the currently known pumps can be used as micromembrane pumps of the pump units, their essentially disk-shaped microstructures preferably consisting of a semiconductor material, in particular of silicon or an alloy containing silicon.
  • the micromembrane pumps preferably have a piezoelectric, electromagnetic, electrostatic or thermopneumatic actuating element for driving their membrane.
  • the thickness of such a silicon membrane is usually bears between approximately 10 and 200 ⁇ m, the actuating element, for example a piezoelectrically activatable actuator, being seated directly on the membrane.
  • the micromembrane pumps of the rows or columns of the pipetting channels arranged in a matrix are connected to one another in a material-fitting manner, it also being understood that groups arranged in a cluster or, in particular, all the micro-membrane pumps of the pipetting device can also be materially connected to one another. While the last-mentioned embodiment enables a particularly cost-effective production of the pump arrangement, an exchange of individual pump units is possible in the case of several groups of one-piece micromembrane pumps and can be reduced during production of the pump unit with the majority of the micro-membrane pumps used for the dosing head provided according to the invention as a result of manufacturing defects.
  • micromembrane pumps of the pipetting device can in principle also work according to the direct displacement principle, in a preferred embodiment, an air cushion is provided between the fluid to be pipetted in the pipetting channels and the at least one micromembrane pump assigned to the respective pipetting channel.
  • the micromembrane pumps of the pipetting device it is of course also conceivable for the micromembrane pumps of the pipetting device to come into direct contact with the medium to be conveyed.
  • each pipetting channel is assigned two micromembrane pumps that can be activated separately from one another, each with a suction-side and a pressure-side connection, the pipetting channel with the pressure-side connection of one micromembrane pump and is connected to the suction side connection of the other micro diaphragm pump.
  • the delivery volume can be set precisely both during the suction process and during the metering process and, in particular, can also be programmed separately from one another on the basis of the data processing unit provided according to the invention.
  • One of the micromembrane pumps is preferably connected on the pressure side and the other micromembrane pump on the suction side to the environment, so that in the event of an air cushion in the pumps themselves, only air is conveyed and contamination of the pumps or - in the case of using pipette tips - the pipette channels the fluid to be pipetted are avoided.
  • the pressure and suction connections of the micromembrane pumps are preferably equipped with check valves in order to force the opposite flow direction in the two micromembrane pumps, each assigned to a pipetting channel.
  • each pipetting channel is assigned a micromembrane pump with two openings which can be closed by separately controllable valves, the pipetting channel being connected to one of the two openings.
  • the delivery volume can be precisely set and, in particular, also programmed, by suitable control of the valves both during the suction process and during the metering process.
  • valves of the micromembrane pumps of such a pipetting device expediently have one the drive mechanism of the membrane corresponding drive mechanism, for example, piezoelectric actuators can be provided for both the valves and for the membrane.
  • the invention also relates to a computer program product for controlling a pipetting device with a plurality of pipetting channels, which are arranged in one or more rows or in a matrix-like manner in several rows of columns and can be connected at the end to a pipette tip in each case, each pipetting channel for metered suction and / or dispensing of fluids, at least one separate micromembrane pump is assigned, with a user interface which enables the input of an individual metering volume for each pump or groups of pumps, the program generating a signal which can be transmitted to a processor for each metering volume, so that the processor supports each pump the dosing volume entered in each case.
  • Such a computer program product which can be embodied on any data carriers, such as floppy disks, CD-Roms, hard drives, etc., enables simple and convenient individual control of the multiplicity of micromembrane pumps and in particular a pre-programming thereof, so that the pipetting device can also be used for a long time without the Use of operating personnel can work.
  • the user interface of the computer program product reproduces the pipetting channels of the pipetting device arranged in rows or rows or in matrix-like fashion in rows or columns, so that all or only groups of the pipetting channels can be reproduced on a display, such as a monitor and each pipetting channel the desired, individual dosing volume under test avoidance of operating errors can be assigned.
  • FIG. 1 shows a schematic view of a metering head of a multi-channel pipetting device with pipette channels arranged in a matrix in several rows and columns;
  • FIG. 2 shows a detailed view, shown in section, of a pipetting channel of the dosing head according to FIG. 1 which is connected to a micromembrane pump;
  • FIGS. 1 and 2 shows a detailed view of the one-piece micromembrane pumps of the dosing head according to FIGS. 1 and 2 and
  • FIG. 4 shows a detailed view, shown in section, of a pipetting channel connected to two micromembrane pumps of an alternative embodiment of a dosing head of a multi-channel pipetting device.
  • the dosing head 1 shown in FIG. 1 of a pipetting device which is otherwise not shown, has a plurality of pipetting channels 4 arranged in a matrix in several rows 2 and columns 3, each having a pipette tip 5 attached to its end on the use side.
  • the pipette tips 5 are designed as disposable pipette tips, with the medium to be pipetted and the pipetting channels being seen 4 an air cushion is provided.
  • the distance between the pipetting channels 4 and the pipette tips 5 corresponds in particular to the distance between the receptacles of a standardized microtiter plate.
  • the dosing head 5 is also equipped with an approximately plate-shaped carrier 6, on the underside of which faces the pipetting tips 5, the pipetting channels 4 open.
  • the carrier 6 is equipped with a number of micromembrane pumps 8 (cf. FIGS. 2 ff) corresponding to the number of pipetting channels 4 (cf. FIGS. 2 ff), each pipetting channel 4 having a separate micromembrane pump is assigned and the micromembrane pumps can be programmed separately from one another by means of an electronic data processing unit (not shown) in order to be able to adjust the metering volume on each micromembrane pump separately from one another.
  • the entire pipetting device can furthermore have a carriage (not shown), for example guided along a rail, to which the carrier 6 of the dosing head 1 is attached and which can be moved in a controlled manner in particular by means of a data processing unit.
  • the pipetting device can also be assigned a holding device for setting microtiter plates in order to be able to simultaneously carry out dosing processes in at least some recordings of the microtiter plate by means of the dosing head 1.
  • the micromembrane pump 8 has two im essentially disc-shaped platelets 9, 10, so-called wafers, which are made, for example, from semiconductor material, in particular from silicon or an alloy containing such.
  • a pump chamber 11 is formed between the platelets 9, 10 and communicates with the pipetting channel 4 via a passage 12 in the platelet 10 facing the pipette tip -5 in FIG. 2 and lower.
  • an air cushion is provided between the passage 12 and the fluid to be metered by means of the pipette tip 5.
  • the pump chamber 11 is connected to the environment via a further passage 13 in the plate 10, a filter 14 being interposed in order to avoid contamination.
  • the lower plate 10 in FIG. 2 has in the region of the passages 12, 13 in each case a circumferential bead 14 which projects in the direction of the pump chamber 11 and which in each case forms a valve seat.
  • the valves themselves are each formed by a projection 15 which is essentially aligned with the respective passage 12, 13 on the side of the upper plate 9 facing the lower plate 10.
  • an actuator 16 e.g. in the form of a piezoelectric element, arranged to be able to open and close the valves 15 individually. In this way, the valves 15 of the passages 12, 13 can be opened or closed separately from one another by means of separate actuators 16.
  • the membrane 17 of the micromembrane pump 8 is formed by a central section of the upper plate 9, which has a reduced cross section compared to the edge-side sections of the plate 9, at which the latter is connected to the lower plate 10.
  • a further actuator 17 for actuating the membrane 17 is provided directly on the membrane 17, which can be formed, for example, corresponding to the actuator 16 by a piezoelectric element, so that the drive mechanism of the membrane 17 that of the valves 15 corresponds to. Both the opening and closing of the valves 15 and the actuation of the membrane 17 take place by elastic deformation of the silicon material of the upper plate 9 in the area equipped with the corresponding actuator 16, 18.
  • All of the microstructures in the form of passages, protrusions, thickenings, etc. in the cross section of the platelets 9, 10 can be obtained after production of the platelets 9, 10 by appropriate processes known from microtechnical material shaping, such as silicon etching, photolithography, etc.
  • the platelets 9, 10 can be produced separately and, after the microstructures have been applied, connected to one another at their mutually facing regions surrounding the pump chamber 11.
  • the rows 2 or columns 3 of pipetting channels 4 of the pipetting device (FIG. 1) or also all pipetting channels have micromembrane pumps 8 which are connected to one another in a material-locking manner for reasons of simple and inexpensive production.
  • Both the upper platelet 9 and the lower platelet 10 are each a row 2 or a column 3 of pipette channels 4 associated with micro-membrane pumps 8 formed in one piece from a single wafer with the microstructures applied thereon.
  • all or cluster-shaped micromembrane pumps 8 can also be constructed from common platelets 9, 10.
  • the distance between the passages 12 connected to the pipetting channels 4 expediently corresponds to the hole distance of a standardized microtiter plate.
  • All micromembrane pumps 8 of a pump unit formed in this way can be programmed individually and separately from one another by means of an electronic data processing unit, so that the metering volume of each micromembrane pump 8 can be set separately from one another.
  • a computer program product is provided with a user interface that enables the input of an individual dosing volume for each pump 8 or groups of pumps 8, the program generating a signal that can be transmitted to a processor (not shown) for each dosing volume, so that the processor each pump 8 is individually controlled with the dosing volume entered.
  • the micromembrane pumps 8 of the pump unit work as follows: To suck in the fluid to be pipetted, the valve 15 associated with the passage 12 between the pump chamber 11 and the pipetting channel 4 is closed, the actuation of the actuator 16 deforming the area of the upper plate 9 opposite the passage 12 such that the projection 15 comes to bear sealingly on the circumferential bead 14. The pump chamber 11 is then reduced in size by actuating the actuator 18 or by the deformation of the membrane 17 caused thereby.
  • valve 15 assigned to the passage 13 between the pump chamber 11 and the outlet is then closed in a corresponding manner by means of the actuator 16, then the valve 15 assigned to the passage 12 between the pump chamber 11 and the pipetting channel 4 is opened again and the pump chamber 11 is closed Switching off the actuator 18 or reshaping the membrane 17 is enlarged again, so that the fluid is sucked into the pipette tip 5. This process is repeated until the desired dosing volume has been sucked in.
  • valve 15 assigned to the passage 12 between the pump chamber 11 and the pipetting channel 4 is then closed in a corresponding manner by means of the actuator 16, and then the passage 13 between the pump nut 11 and the valve 15 assigned to the outlet are opened again and the pump chamber 11 by switching off the actuator 18 or
  • the process is repeated until the desired dosing volume has been dispensed.
  • each pipetting channel 4 has two micromembrane pumps 8a, 8b which can be activated separately from one another.
  • the micromembrane pumps 8a, 8b like the micromembrane pumps 8 of the exemplary embodiment according to FIGS. 2 and 3, are formed by approximately disk-shaped plates 9, 10, which in turn consist for example of silicon or a silicon alloy.
  • the pump chamber 11 of the micromembrane pump 8b formed between the platelets 9, is connected to the pipetting channel 4 with its connection 20 on the pressure side, with the interposition of an air cushion, and to the environment with its connection 21 on the suction side, with the interposition of a filter 14.
  • the pump chamber 11 of the micromembrane pump 8a is connected with its suction-side connection 21 to the pipetting channel 4 and with its pressure-side connection 20 to the environment.
  • the membrane 17 of the micromembrane pumps 8a, 8b is formed by a central area of the plate 9, the membrane 17 at the end having a reduced thickness compared to the central area and at this end area merging into an end section of the plate 9, on which the plate 9 also joins the end portion of the plate 10 is connected.
  • the regions of reduced thickness give the membrane 17 increased flexibility when it is actuated by means of an actuator 18 arranged on the side of the membrane facing away from the pump chamber 11.
  • the actuator 18 can, for example, be analogous to that shown in FIGS. set embodiment may be formed by a piezoelectric element.
  • the pressure 20 and suction connections 21 of the micropumps 8a, 8b are formed by check valves in order to force the opposite direction of delivery of the micromembrane pumps 8a, 8b.
  • All of the microstructures formed on the platelets 9, 10, such as the check valves, thickening or tapering of the membrane 17 etc., can be applied to the platelets 9, 10, for example, by means of silicon moldings.
  • the thickened end sections of the platelets 9, 10 in turn ensure that the micromembrane pumps 8a, 8b of a pump unit are decoupled from one another during operation when actuated by the respective actuators 18.
  • the micromembrane pumps 8a, 8b of each row 2 of pipetting channels 4 can also be connected to one another in a material-locking manner.
  • all of the micromembrane pumps 8a, 8b of a row 2 or column 3 of pipetting channels 4 (FIG. 1) or all of the micromembrane pumps 8a, 8b of all pipetting channels 4 of the pipetting device can be formed by one-piece silicon platelets 9, 10, in the latter two cases with -
  • two pumps are arranged parallel to one another above a pipetting channel 4 and, in accordance with the embodiment shown in FIG. 4, each have a pressure and a suction-side connection on the one hand to the pipetting channel 4 and on the other hand to the environment.
  • the distance between such pump pairs assigned to each pipetting channel 4 is then approximately the hole spacing of a respective microtiter plate.
  • all micromembrane pumps 8a, 8b of the pipetting device shown in FIG. 4 can be programmed individually and separately from one another by means of an electronic data processing unit, so that the metering volume of each micromembrane pump 8a for drawing in the pipette to be pipetted
  • Fluids and the metering volume of each micromembrane pump 8b for dispensing the fluid to be pipetted can be set separately from one another.
  • the individual dosing volumes are again entered by means of a computer program product with a user interface of the type described above in connection with FIGS. 2 and 3.
  • the actuator 18 of the left-hand micromembrane pump 8b in FIG. 4 is activated and the membrane 17 connected to it is set in motion, so that the volume of the pump chamber 11 increases ,
  • the fluid connected via the air cushion to the suction-side connection 21 of the micromembrane pump 8a enters the pipette tip 5 as a result of the negative pressure generated.
  • 21 of the Micromembrane pump 8a is ensured during this process that its suction-side connection 21 is open while its pressure-side connection 20 is closed.
  • the check valves in the connections 20, 21 ensure that the one connected to the pipetting channel 4 is connected suction-side connection is closed, while the pressure-side connection connected to the environment via the filter 14 is open. This process is repeated until the desired dosing volume is reached.
  • the fluid is dispensed by means of the micromembrane pump 8b on the right in FIG. 4.
  • the diaphragm 17 of this pump 8b is vibrated in an identical manner by means of the actuator 18 so that the volume of the pump chamber 11 is increased or decreased periodically.
  • the check valves in the connections 20, 21 of the micromembrane pump 8b are switched in such a way that the pressure-side connection 20 of the pump 8a connected to the pipetting channel 4 in the event of overpressure in the
  • the pump chamber 11 is open and, in the case of negative pressure, is closed in the same, while the suction-side connection 21 of this pump 8b, which is connected to the environment, is closed in the case of excess pressure in the pump chamber 11 and is opened in the case of negative pressure therein.
  • the dosing volume can in turn be controlled via the number of strokes of the membrane 17, with a defined dosing volume being assigned to each stroke, in particular in the nanoliter range.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Reciprocating Pumps (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

L'invention concerne un dispositif de pipettage comprenant une pluralité de canaux de pipettage disposés en une ou plusieurs rangées, ou à la manière d'une matrice, en plusieurs rangées et colonnes, et qui sont liés à leurs extrémités respectives, à une pointe de pipette. A chaque canal de pipettage est associée, pour l'aspiration ou la distribution dosée de fluides, au moins une pompe à micromembrane séparée, constituée de plusieurs microstructures en forme de disques, superposées, entre lesquelles est formée une chambre de pompage, et parmi lesquelles au moins l'une présente la membrane déformable par un élément d'actionnement. L'invention a pour but de fournir un dispositif de pipettage de ce type, d'une construction simplifiée et économique, et offrant une excellente facilité d'utilisation. A cet effet, l'invention est caractérisée en ce qu'au moins plusieurs des pompes à micromembrane de différents canaux de pipettage sont reliées entre elles par liaison de matière, et en ce que les pompes à micromembrane de chaque canal de pipettage sont programmables séparément l'une de l'autre, au moyen d'une unité de traitement électronique, de telle façon que le volume dosé de chaque pompe à micromembrane soit réglable séparément.
EP04764496A 2003-09-26 2004-08-26 Dispositif de pipettage a canaux multiples Withdrawn EP1663495A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10344700A DE10344700A1 (de) 2003-09-26 2003-09-26 Mehrkanal-Pipettiervorrichtung
PCT/EP2004/009520 WO2005035126A1 (fr) 2003-09-26 2004-08-26 Dispositif de pipettage a canaux multiples

Publications (1)

Publication Number Publication Date
EP1663495A1 true EP1663495A1 (fr) 2006-06-07

Family

ID=34306079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04764496A Withdrawn EP1663495A1 (fr) 2003-09-26 2004-08-26 Dispositif de pipettage a canaux multiples

Country Status (4)

Country Link
US (1) US20070048188A1 (fr)
EP (1) EP1663495A1 (fr)
DE (1) DE10344700A1 (fr)
WO (1) WO2005035126A1 (fr)

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