EP0076222B1 - Automatische Pipettiereinrichtung - Google Patents
Automatische Pipettiereinrichtung Download PDFInfo
- Publication number
- EP0076222B1 EP0076222B1 EP82440027A EP82440027A EP0076222B1 EP 0076222 B1 EP0076222 B1 EP 0076222B1 EP 82440027 A EP82440027 A EP 82440027A EP 82440027 A EP82440027 A EP 82440027A EP 0076222 B1 EP0076222 B1 EP 0076222B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pipette
- valve
- actuator
- unit
- constituted
- 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.)
- Expired
Links
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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
- B01L3/02—Burettes; Pipettes
- B01L3/0203—Burettes, i.e. for withdrawing and redistributing liquids through different conduits
Definitions
- the present invention relates to the field of handling volumes of liquids for operations such as taking samples or dispensing reagents or dilutions, and relates to an automatic pipetting device intended for this purpose.
- a pipette in particular of the bulb type, to which are added two photoelectric detectors signaling the arrival of the meniscus at a high position and at a low position, a three-way valve and two positions and a piping and reservoir system allowing circulation of the liquid by gravity, alternately to fill the pipette from a reservoir, in one position of the valve, then to empty said pipette in another container, in the other position the valve, the filling and emptying of the pipette being checked by checking the position of the meniscus by means of the detectors.
- the present invention aims to overcome these drawbacks.
- an automatic pipetting device which is constituted by an automatic pipetting actuator and by a pipette block forming two dissociable sub-assemblies, the pipette block being removably mounted in the actuator, even in the filled state, while remaining sealed, and consisting of a pipette connected at its lower end to a three-way valve and three positions, provided with a drive member, and which is extended by piping elements, one of which leads to a product reservoir, the pipette being provided at its upper end with a sealed pneumatic connection device also used for positioning the pipette, and the automatic pipetting actuator consisting of a stepper motor provided with a withdrawable coupling for driving the valve of the pipette block, by a photoelectric meniscus detection assembly comprising a movable detector driven in translation, by a pneumatic suction and discharge device connected to the pipette, by an electronic control unit provided with a control and display panel, and by a quick blocking lever of the pipette block
- the automatic pipetting device is essentially constituted by an automatic pipetting actuator 1 and by a pipette block 2, which form two dissociable subsets.
- the pipette block 2 is removably mounted in the actuator 1 and is formed by a pipette 3 connected at its lower end to a three-way, three-position valve 4, provided with a drive member 5, which is extended by piping elements 6, one of which leads to a product reservoir 7.
- a sealed pneumatic connection device 8 which is also used for its positioning.
- the automatic pipetting actuator 1 is constituted by a stepping motor 9 provided with a withdrawable coupling 10 for driving the valve 4 of the pipette block 2, by a assembly 11 for photoelectric detection of the position of the meniscus, by a pneumatic suction and delivery device 12 connected to the pipette 3, by an electronic control assembly 13 provided with a control and display panel 14, and by a lever 15 for quick locking of the pipette unit 2.
- the valve 4 is housed in a valve body 16 used for centering the pipette 3 and having openings 17 for connecting the pipe elements 6 (FIG. 3), and is constituted by a base 18 (FIG. 4) having the form d '' a disc and comprising, on one face around its center, a raised part 19 with a perfectly flat and polished surface forming a first sealing part, and in which three channels 20, 21 of which perpendicularly end, lead to the opposite face of the disc, and the third of which, 21, is connected to a perpendicular channel 22 ending in a cut plane 23 at the periphery of the disc 18 for the connection of the pipette 3, by a rotary valve 24 forming the second piece of sealing and also comprising a perfectly flat and polished face, in which is provided a cell 25 of curved shape (FIG. 5).
- the channels 20, 21 are advantageously arranged at 120 ° from each other, and the cell 25 has an angle at the center, enclosing its ends, of 120 °.
- the ends of the cell 25 can be superimposed exactly on the orifices of the channel 21 and of one of the channels 20 in one of its rotational positions, or on the orifices channel 21 and the other channel 20 in the other position of rotation, no connection being established in the middle position of the valve 24 and the channels 20, 21 being closed in a sealed manner in this position.
- the valve 24 On the face opposite to that carrying the cell 25, the valve 24 is provided with a central contact surface 26 and two or more recesses 27 distributed at regular intervals on the periphery, these recesses cooperating with drive pins 28 integral with a part forming the coupling member 5 so as to produce a peripheral drive, this part 5 being pressed punctually in its center on the surface 26, one or the other of these two parts in contact having for this purpose a domed shape, and being loaded by tension springs 29 by means of a transverse key 30, or the like, this part 5 being, moreover, guided in a sleeve 31 for mounting in the body 16, where it is immobilized by means of a pressure screw 32, or a similar securing device, the assembly of springs 29 and transverse key 30 forming an automatic return device in the middle position of the valve 4.
- the coupling member 5 is provided with a transverse slot 33, arranged along the vertical axis of the pipette and allowing its drive connection with the coupling 10 of the motor 9.
- valve 4 a perfect seal is obtained between its constituent elements and its rapid rotation drive can be carried out without overturning effect, the bearing force being applied to the center of the valve 24 without requiring a very precise orientation of the drive member 5.
- the provision of at least two clearances 27 for training, or a higher number of these clearances arranged at regular intervals helps to avoid a couple of overturning, these clearances 27 and the corresponding pins 28 also having the effect of maintaining the coaxiality between valve 24 and base 18.
- the base 18 and the valve 24 are advantageously made of a material resistant to corrosion by chemical agents, and they are dimensioned in such a way that the joint widths make it possible to obtain the internal and external seals essential in all positions.
- the valve body 16 Perpendicular to the drive member 5, the valve body 16 is provided with a bore 34 allowing the positioning of the pipette 3 by means of pins 35 cooperating with a circular groove of a metallic cylindrical sleeve 36 fixed on the lower end of the pipette 3 coaxial therewith and resting on the cut plane 23 of the base 18 of the valve 4 with the interposition of a compressed seal 37, this sleeve always having the same outside diameter, whatever the outside diameter of the pipette and the caliber of the pipette. Thanks to this embodiment, the pipette 3 is secured to the valve body 16 without residual play, and the positioning of the block 16 will automatically cause that of the pipette 3.
- the sealed pneumatic connection device 8 fitted to the upper end of the pipette 3 is in the form of a sleeve similar to that fitted to the lower part of the pipette 3, this sleeve cooperating, on the one hand, with a guide bore (not shown) positioned in the actuator 1 and, on the other hand, with a compressible seal connected to the pneumatic device 12 for suction and discharge.
- This device 12 allows the movement of the liquids handled by vacuum for the suction and by relative overpressure for the discharge, that is to say the distribution of the liquids.
- any pipette can be mounted, regardless of its size, in any valve body to form a pipette block of constant size, and all the pipette blocks 2 thus formed can be mounted perfectly interchangeably in the actuator 1.
- the pipettes 3 used consist of calibrated calibrated tubes, that is to say of constant section over their entire length, provided with two graduation lines engraved at a distance from each other corresponding to the nominal volume of the pipette.
- the inside diameters of these tubes may vary slightly, the distances between the lines can therefore also vary, so that the actuator 1 must be equipped with a device which takes account of this possible variation.
- the assembly 11 for photoelectric detection of the position of the meniscus is arranged in the actuator 1 parallel to the pipette 3 and is constituted by a lower fixed detector 38 at the level of which the lower graduation lines of all the pipettes 3, and by an upper mobile detector 39 displaceable by means of a screw-nut assembly 40, or similar device, by a stepping motor 41, which is controlled by the electronic control assembly 13 as a function of data relating to the calibration of the pipette block 2 considered, composed on the control and display panel 14.
- the lower detector 38 is held in abutment at the lower graduation lines of the pipettes 3 by means of an elastic device with springs, or the like, and can be retracted under the action of a push from the upper mobile detector 39 when the latter is moved down until it reaches said level of the lower graduation lines of the pipettes 3, so that the entire useful or nominal volume of the pipette 3 can be used as a burette.
- the electronic control unit 13 is provided with calculation means, which make it possible to determine for the pipette block 2 considered intermediate volumes as a function of requirements.
- the lever 15 for rapid locking of the pipette block 2 is advantageously an eccentric or elastically loaded lever, simultaneously carrying out the sealed application of the upper end of the pipette 3 against the guide bore of the actuator 1, l clutch between the drive member 5 of the valve 4 and the coupling 10 of the stepping motor 9, and the locking in position of the pipette block 2 in the actuator 1 with simultaneous alignment of the pipette 3 with the axis of the detectors 38 and 39, an unlocking of the lever 15 having the effect of instantaneously releasing the pipette block 2 for its possible replacement by another.
- the pipette block 2 can be arranged, together with other pipette blocks, on an alternative or continuous, circular or linear transport device, of the type known, its establishment and maintenance in the actuator 1, as well as its removal being carried out automatically by said transport device by means of a jack, or the like.
- the pipette block 2 being able to easily and quickly be interchanged, and the program for the new pipette block in place can be dialed using its distinctive number.
Landscapes
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
- Centrifugal Separators (AREA)
- Beverage Vending Machines With Cups, And Gas Or Electricity Vending Machines (AREA)
- Cyclones (AREA)
- Devices For Use In Laboratory Experiments (AREA)
- Separation By Low-Temperature Treatments (AREA)
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT82440027T ATE18363T1 (de) | 1981-09-23 | 1982-09-22 | Automatische pipettiereinrichtung. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8118065 | 1981-09-23 | ||
FR8118065A FR2513376A1 (fr) | 1981-09-23 | 1981-09-23 | Dispositif de pipetage automatique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0076222A1 EP0076222A1 (de) | 1983-04-06 |
EP0076222B1 true EP0076222B1 (de) | 1986-03-05 |
Family
ID=9262446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82440027A Expired EP0076222B1 (de) | 1981-09-23 | 1982-09-22 | Automatische Pipettiereinrichtung |
Country Status (6)
Country | Link |
---|---|
US (1) | US4484696A (de) |
EP (1) | EP0076222B1 (de) |
JP (1) | JPS5866854A (de) |
AT (1) | ATE18363T1 (de) |
DE (1) | DE3269648D1 (de) |
FR (1) | FR2513376A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1007943C2 (nl) | 1997-12-31 | 1999-07-01 | Hadewe Bv | Inrichting en werkwijze voor het van een stapel separeren van vellen. |
US20050269368A1 (en) * | 2004-05-14 | 2005-12-08 | Proulx Stephen P | Fluid dispenser cartridge with bladder means |
DE102005025640A1 (de) * | 2005-06-03 | 2006-12-07 | Scienion Ag | Mikrodispenser und zugehöriges Betriebsverfahren |
CN103105316A (zh) * | 2012-11-06 | 2013-05-15 | 苏州聚阳环保科技有限公司 | 一种注射泵 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1705940A (en) * | 1927-06-16 | 1929-03-19 | Stockbridge & Borst | Apparatus for dispensing liquids |
US3143393A (en) * | 1959-06-18 | 1964-08-04 | Luc Donald De Seguin Des Hons | Apparatus for automatically performing chemical operations and similar or related operations |
NL252663A (de) * | 1959-06-18 | |||
US3193141A (en) * | 1963-08-23 | 1965-07-06 | Swift & Co | Device for measuring and dispensing variable amounts of liquid |
US3206072A (en) * | 1964-09-22 | 1965-09-14 | Calvin R Mencken | Pipetting machine |
SE327840B (de) * | 1968-01-25 | 1970-08-31 | Atuokemi Ab | |
CH508877A (fr) * | 1968-04-02 | 1971-06-15 | Micromedic Systems Inc | Doseur pour liquide |
US3491368A (en) * | 1968-05-10 | 1970-01-20 | Hewlett Packard Co | Automatic dispensing system with fluid purging means |
DE2330499A1 (de) * | 1973-06-15 | 1975-01-09 | Boepple & Co Kg | Justieranlage fuer pipetten und bueretten |
DK143719C (da) * | 1979-01-03 | 1982-03-08 | Radiometer As | Fremgangsmaade til udluftning af en vaeskedoserende stempelpumpe og stempelpumpe med et arrangement til brug ved udoevelse affremgangsmaaden |
-
1981
- 1981-09-23 FR FR8118065A patent/FR2513376A1/fr active Granted
-
1982
- 1982-09-22 JP JP57165965A patent/JPS5866854A/ja active Pending
- 1982-09-22 DE DE8282440027T patent/DE3269648D1/de not_active Expired
- 1982-09-22 EP EP82440027A patent/EP0076222B1/de not_active Expired
- 1982-09-22 AT AT82440027T patent/ATE18363T1/de not_active IP Right Cessation
- 1982-09-23 US US06/422,476 patent/US4484696A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US4484696A (en) | 1984-11-27 |
EP0076222A1 (de) | 1983-04-06 |
FR2513376A1 (fr) | 1983-03-25 |
DE3269648D1 (en) | 1986-04-10 |
ATE18363T1 (de) | 1986-03-15 |
JPS5866854A (ja) | 1983-04-21 |
FR2513376B1 (de) | 1983-12-09 |
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