EP1185368A1 - Pipette with tip ejector - Google Patents

Pipette with tip ejector

Info

Publication number
EP1185368A1
EP1185368A1 EP99917735A EP99917735A EP1185368A1 EP 1185368 A1 EP1185368 A1 EP 1185368A1 EP 99917735 A EP99917735 A EP 99917735A EP 99917735 A EP99917735 A EP 99917735A EP 1185368 A1 EP1185368 A1 EP 1185368A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
pipette
ejection member
ejection
piston
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
Application number
EP99917735A
Other languages
German (de)
French (fr)
Other versions
EP1185368B1 (en
Inventor
Sylvain Christen
Jean-Pierre Uldry
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.)
Socorex Isba SA
Original Assignee
Socorex Isba SA
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 Socorex Isba SA filed Critical Socorex Isba SA
Publication of EP1185368A1 publication Critical patent/EP1185368A1/en
Application granted granted Critical
Publication of EP1185368B1 publication Critical patent/EP1185368B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B01L3/0275—Interchangeable or disposable dispensing tips
    • B01L3/0279—Interchangeable or disposable dispensing tips co-operating with positive ejection means

Definitions

  • the invention relates to a pipette for transferring liquids, comprising at least one piston-cylinder assembly arranged so that it can be provided with a transfer nozzle.
  • Pipettes of this type are generally known, an example being described in American patent US Pat. No. 5,614,153.
  • Such a pipette allows small amounts of liquid to be transferred into a replaceable tip mounted at the free end of the pipette cylinder. This transfer takes place without contamination of the pipette, the used tips being replaced by new tips.
  • the pipette is provided with a nozzle ejector which can be actuated manually and comprises an ejection member sliding along the cylinder to abut against the nozzle and push it so as to separate it from the cylinder. In this pipette, the ejection member travels an invariable distance and its final position is fixed.
  • the tips used can come from different manufacturers or have different shapes, so their dimensions can vary from one to the other.
  • the position of the tips on the cylinder can differ depending on the variants available on the market and depending on the engagement force. It follows a variation in the position of the edge of the tip on which abuts the ejection member.
  • the position variations being of the order of magnitude of the stroke of the ejection member, certain end pieces are not ejected or can abut on the ejector before creating a seal between the end piece and the cylinder of the pipette.
  • An object of the invention is to provide a pipette which makes it possible to attach and eject the tips in a reliable manner, in particular taking into account the variable position of the edge of the tip relative to the pipette.
  • a pipette is preferably designed so as to be easy to use and robust.
  • the present pipette for transferring liquids comprises at least one piston-cylinder assembly, the cylinder of which may be provided with a replaceable tip, a piston actuation device for causing suction. and the liquid delivery and a nozzle ejector device comprising an ejection member movable along the cylinder, has the particularity that the ejector device comprises a position adjustment device arranged so as to allow the limit position reached to be modified at the end of the stroke by the end of the ejection member during an ejection operation from the end piece. It should be noted that in practice, the adjustment will generally be made by adjusting the starting position of the free edge of the ejection member intended to come up against the upper edge of the end piece. In all embodiments, the present pipette allows attaching and ejecting, reliably, tips of different shapes and sizes.
  • the position adjustment device may include a sleeve disposed on the cylinder of the piston-cylinder assembly, the cooperation between this sleeve and the ejection member making it possible to adjust the position of the end of the ejection from the cylinder.
  • the socket and the ejection member can be coupled by threaded parts or by the support of a lug or another element against a crown having an inclined surface, so that the adjustment of the position of the member d ejection takes place by a relative rotation between the sleeve and this member.
  • the ejection member is rotatable and the socket is kept fixed
  • the socket is rotary and the ejection member is fixed.
  • the socket and / or the ejection member may be provided with notches, a lug or similar means for defining its angular position relative to the counterpart.
  • the sleeve which can be mounted on a part of the cylinder, and the ejection member are easily accessible and adjustable.
  • Variants of the position adjustment device consist in using, for example, a socket whose position is adjustable relative to the ejection member and which is mounted on this member so as to form the ejection end of this one.
  • the sleeve and the ejection member may have respective threaded parts, or may comprise other fixing means making it possible to adjust the position of the sleeve as a function of the endpiece used.
  • Another variant consists in using a position adjustment device which makes it possible to modify the limit position of the ejection member by a variation of the stroke of the ejection member relative to the cylinder.
  • the ejection member can for example be coupled to its actuating device via a member of variable length so as to modify at least one limit position of the actuating member.
  • Fig. 1 is a partial sectional view of a first embodiment of a pipette according to the invention
  • Fig. 2 is a partial sectional view of a piston-cylinder assembly of the pipette of FIG. 1;
  • Fig. 3 is an enlarged view, in section, along the line III-III of FIG. 2;
  • Fig. 4 is a sectional view of a second embodiment of a pipette according to the invention.
  • Fig. 5 is a partial sectional view of a piston-cylinder assembly of a third embodiment.
  • Figures 6 to 9 are partial views, in section, of variants of a position adjustment device disposed near the end of the pipette cylinder.
  • FIGS. 1 to 3 and Fig. 4 show, respectively, pipettes 1 and 1 ′, the analogous parts of which have been designated by the same reference numeral.
  • a pipette comprises a pipette body 2 provided with a usual piston-cylinder assembly 3, 4, a piston actuation device 5 and an ejector device 6.
  • the piston actuation device 5 comprises a pusher 7 acting on the piston 3 of the piston-cylinder assembly which makes it possible to aspirate and / or pumping liquid through a replaceable nozzle 8 mounted at the end 9 of the cylinder 4 of the piston-cylinder assembly.
  • the cylinder 4 communicates with the end piece 8 through an opening 10 at its end 9.
  • the plunger 7 of the piston actuation device 5 comprises a button 11 and a rod 12.
  • the rod 12 is coupled to the button 11 by means of a threaded part 13, so as to allow the position of the rod 12 and therefore of the piston 3 relative to the cylinder to determine the volume of liquid sucked.
  • Other devices for actuating the piston 12 can be provided without departing from the scope of the invention, the actuation possibly being, for example, hydraulic or electric.
  • the rod 12 is coupled at its end 14 in a separable manner to the piston 3.
  • the piston 3 is provided with elastic arms 15 having recesses 56 on their internal surface so as to be able to cooperate with the end 14 of the rod 12, which is shaped like a ball.
  • the coupling between the elastic arms 15 and the end 14 is therefore quickly separable by application of a certain tensile force on the piston-cylinder assembly relative to the body 2. This makes it possible, for example, to exchange the piston assemblies -cylinder having different suction volumes or of different shape and dimensions to comply with different standards, or to exchange defective assemblies without having to replace the entire device.
  • the connection between the elastic arms 15 and the ball 14 form an advantageous plug and socket assembly because it is very simple and quick to disconnect and reconnect the devices.
  • the ejector device 6 comprises an ejection member 16 or 16 ′ having a tubular part arranged so as to be able to slide on the cylinder 4, and an actuating device 17 of this ejection member.
  • the actuating device 17 comprises a pusher 18 and a rod 19 connecting the pusher to a coupling member 20 or 20 '.
  • the coupling member makes a separable connection between the ejection member 16 or 16 'and the actuating device 17 by snap-fastening, for example by the interaction of protuberances and grooves formed on complementary parts.
  • the ejection member 16 or 16 ′ is moved over a distance determined by the movement of this pusher.
  • the end 22 of the ejection member abuts on the upper edge 23 of the nozzle to separate it from the cylinder 4.
  • the pusher 18 is advantageously placed on the same side of the pipette body as the claw 21, this which facilitates the actuation of the ejection pusher easily accessible to the operator.
  • this arrangement makes the opposite side of the pipette body free to easily arrange a display device there.
  • the ejector device comprises a position adjustment device 24 comprising a threaded part 25 at the upper end of the rod 19 which is engaged in a threaded part complementary to a bore 26 of the pusher 18.
  • the head of the part threaded 25 is accessible from the outside to allow adjustment of the position of the rod 19 relative to the pusher 18, the coupling member 20 allowing the rotation of the rod 19.
  • This rotation displaces the ejection member 16 relative to the cylinder 4.
  • the position of the end 22 of the ejection member 16 can therefore be adjusted to allow the ejection of end pieces 8 having upper edges situated at different heights relative to the end 9 of the cylinder.
  • the position of the pusher 18 is adjusted to vary the stroke of the actuating member determined by the distance between the upper limit position of the pusher and the sleeve or the claw 21.
  • the variation of the stroke of the pusher 18 modifies thus also the limit position of the end 22 of the ejection member reached during actuation of the ejector. This produces a reliable ejection of tips having different positions and / or dimensions.
  • Figures 1 to 3 show a preferred embodiment of the invention.
  • the position adjustment device 24 ′ comprises a socket 27 mounted around the cylinder 4 near the upper end of the latter.
  • the socket 27 has a peripheral groove 28 into which a projecting part of the coupling member 20 'connected to the actuating rod 19 penetrates.
  • the socket 27 can rotate around its axis, while being integral, in the axial direction, with the actuating device of the ejection member 16 '.
  • An internal thread 29 of the sleeve 27 cooperates with a thread 30 on the upper part of the ejection member 16 ', so that a rotation of the sleeve makes it possible to move the end 22 of the ejection member away from or closer to the end 9 of the cylinder 4.
  • the inner surface of the sleeve has a series of axial notches 31 in which a godron 32 of the periphery of the upper part of the member 16 'can engage so as to define the angular position of the sleeve with respect to to this organ.
  • the member 16 ' is prevented from rotating about its axis and therefore moves in the axial direction relative to the cylinder 4 when adjusting its position by rotation of the sleeve 27.
  • the sleeve 27 is fixed and the member 16 'is rotatably mounted, so that a rotation of the ejection member makes it possible to move the end 22 away from or closer to the end 9 of the cylinder 4.
  • the ejector device comprises a position adjustment device 24 "provided with a fixed socket 27 'and an ejection member 16" mounted so as to allow its rotation on the cylinder 4.
  • the member ejection is provided with a part 32 with a lug 32 "which engages in notches 31 'of a crown 29' having an annular inclined engagement surface 29".
  • the notches 31 ′ arranged at intervals around the periphery of the crown thus define different height positions for adjusting the position of the end 22 of the ejection member 16 ".
  • a spring 55 acting on the bush 27 'and on the member 16 "ensures the engagement of the lug 32" in one of the notches 31'.
  • the piston-cylinder device of FIG. 5 can also include a piston and means for allowing rapid coupling to a pipette body similar to the means described above in relation to the embodiment of Fig. 2.
  • an adjustment sleeve can be mounted on an end part of the ejection member, according to the variants shown in Figures 6 to 9, to form an ejection edge 22 'whose position can be adjusted relative to cylinder 4 of the pipette.
  • a socket 33 or 33 ' is mounted on the part 34 or 34' of the ejection member which has a thread 35 or 35 ' cooperating with a complementary thread of the sleeve.
  • notching grooves 36 are formed on the bottom of the thread to allow a good definition of the angular position of the sleeve 33.
  • the notching is moved on the cylindrical part 37 of the member ejection and formed by a set of notches-gadroons 38 on this part and the socket 33 '.
  • Fig. 7 shows a variant in which a socket 39 is mounted on an end portion 40 of the ejection member by means of lugs, such as 41, which are positioned in corresponding grooves arranged on the periphery of the part 40.
  • lugs such as 41
  • These grooves such as 42, 43, 44, have different heights which make it possible to define corresponding positions of the sleeve relative to the ejection member.
  • the guide of the sleeve is provided by the cylinder 4 on which it slides.
  • a socket 39 ' is provided with longitudinal tabs 50, provided at their free ends with protrusions 51 arranged so as to be able to penetrate in dormers, such as 52, 53, 54, located at different heights in the part 40' of the ejection member.
  • the limit position of the end of the ejection member is adjustable at this end so as to obtain an effective ejection for end pieces whose upper edge is located at different heights from the pipette cylinder.

Abstract

The invention relates to a pipette for transferring liquids, comprising the following: at least one piston-cylinder arrangement (3, 4), in which the cylinder (4) is arranged in such a way that it can be provided with a replaceable tip (8) for containing the liquid to be transferred; a piston actuating device (5) for drawing up and discharging the liquid; and a tip ejector device (6). Said ejector device comprises an ejection mechanism (16, 16') which can be displaced along the cylinder in order to eject a tip (8) from the end of said cylinder. A device (17) for actuating the ejection mechanism is also provided. The invention is characterized in that the ejector device (6) comprises a device for adjusting position (24, 24', 33, 33', 39, 39'), which is arranged in such a way that it is possible to modify the limit position reached by an ejection end (22, 22') of the ejector device at the end of a stroke.

Description

Pipette avec éjecteur d'embouts Pipette with tip ejector
L'invention concerne une pipette pour le transfert de liquides, comportant au moins un ensemble piston-cylindre agencé de façon à pouvoir être muni d'un embout de transfert.The invention relates to a pipette for transferring liquids, comprising at least one piston-cylinder assembly arranged so that it can be provided with a transfer nozzle.
Des pipettes de ce type sont généralement connues, un exemple étant décrit dans le brevet américain US 5,614,153. Une telle pipette permet de transférer de petites quantités de liquide dans un embout remplaçable monté à l'extrémité libre du cylindre de la pipette. Ce transfert s'effectue sans contamination de la pipette, les embouts usagés étant remplacés par de nouveaux embouts. La pipette est munie d'un éjecteur d'embouts qui peut être actionné manuellement et comporte un organe d'éjection coulissant le long du cylindre pour venir buter contre l'embout et le pousser de manière à le séparer du cylindre. Dans cette pipette, l'organe d'éjection parcourt une distance invariable et sa position finale est fixe.Pipettes of this type are generally known, an example being described in American patent US Pat. No. 5,614,153. Such a pipette allows small amounts of liquid to be transferred into a replaceable tip mounted at the free end of the pipette cylinder. This transfer takes place without contamination of the pipette, the used tips being replaced by new tips. The pipette is provided with a nozzle ejector which can be actuated manually and comprises an ejection member sliding along the cylinder to abut against the nozzle and push it so as to separate it from the cylinder. In this pipette, the ejection member travels an invariable distance and its final position is fixed.
Les embouts utilisés peuvent provenir de fabricants différents ou avoir des formes différentes, de sorte que leurs dimensions peuvent varier de l'un à l'autre. Ainsi, la position des embouts sur le cylindre peut différer selon les variantes disponibles sur le marché et selon la force d'engagement. Il s'ensuit une variation de la position du bord de l'embout sur lequel vient buter l'organe d'éjection. Les variations de position étant de l'ordre de grandeur de la course de l'organe d'éjection, certains embouts ne sont pas éjectés ou peuvent buter sur l'éjecteur avant la création d'une étanchéité entre l'embout et le cylindre de la pipette.The tips used can come from different manufacturers or have different shapes, so their dimensions can vary from one to the other. Thus, the position of the tips on the cylinder can differ depending on the variants available on the market and depending on the engagement force. It follows a variation in the position of the edge of the tip on which abuts the ejection member. The position variations being of the order of magnitude of the stroke of the ejection member, certain end pieces are not ejected or can abut on the ejector before creating a seal between the end piece and the cylinder of the pipette.
Un but de l'invention est de réaliser une pipette qui permet d'attacher et d'éjecter les embouts d'une manière fiable, en particulier en tenant compte de la position variable du bord de l'embout par rapport à la pipette. Une telle pipette est de préférence conçue de façon à être facile à utiliser et robuste.An object of the invention is to provide a pipette which makes it possible to attach and eject the tips in a reliable manner, in particular taking into account the variable position of the edge of the tip relative to the pipette. Such a pipette is preferably designed so as to be easy to use and robust.
La présente pipette pour le transfert de liquides comporte au moins un ensemble piston-cylindre dont le cylindre peut être muni d'un embout remplaçable, un dispositif d'actionnement de piston pour provoquer l'aspiration et le refoulement du liquide et un dispositif éjecteur d'embouts comprenant un organe d'éjection déplaçable le long du cylindre, a la particularité que le dispositif éjecteur comporte un dispositif d'ajustement de position agencé de façon à permettre de modifier la position limite atteinte en fin de course par l'extrémité de l'organe d'éjection lors d'une opération d'éjection de l'embout. Il est à noter que dans la pratique, l'ajustement se fera généralement par l'intermédiaire du réglage de la position de départ du bord libre de l'organe d'éjection destiné à venir buter sur le bord supérieur de l'embout. Dans toutes les formes d'exécution, la présente pipette permet d'attacher et d'éjecter, de façon fiable, des embouts de formes et de dimensions différentes.The present pipette for transferring liquids comprises at least one piston-cylinder assembly, the cylinder of which may be provided with a replaceable tip, a piston actuation device for causing suction. and the liquid delivery and a nozzle ejector device comprising an ejection member movable along the cylinder, has the particularity that the ejector device comprises a position adjustment device arranged so as to allow the limit position reached to be modified at the end of the stroke by the end of the ejection member during an ejection operation from the end piece. It should be noted that in practice, the adjustment will generally be made by adjusting the starting position of the free edge of the ejection member intended to come up against the upper edge of the end piece. In all embodiments, the present pipette allows attaching and ejecting, reliably, tips of different shapes and sizes.
Le dispositif d'ajustement de position peut comporter une douille disposée sur le cylindre de l'ensemble piston-cylindre, la coopération entre cette douille et l'organe d'éjection permettant de régler la position de l'extrémité de l'organe d'éjection par rapport au cylindre. La douille et l'organe d'éjection peuvent être couplés par des parties filetées ou par l'appui d'un ergot ou un autre élément contre une couronne ayant une surface inclinées, de façon que le réglage de la position de l'organe d'éjection s'effectue par une rotation relative entre la douille et cet organe. Ainsi, dans une première forme d'exécution, l'organe d'éjection est rotatif et la douille est maintenue fixe, et dans une forme d'exécution alternative, la douille est rotative et l'organe d'éjection est fixe. La douille et/ou l'organe d'éjection peut être munie de crans, d'un ergot ou de moyens similaires pour en définir la position angulaire par rapport à la contrepartie. Avantageusement, la douille qui peut être montée sur une partie du cylindre, et l'organe d'éjection sont facilement accessibles et réglables.The position adjustment device may include a sleeve disposed on the cylinder of the piston-cylinder assembly, the cooperation between this sleeve and the ejection member making it possible to adjust the position of the end of the ejection from the cylinder. The socket and the ejection member can be coupled by threaded parts or by the support of a lug or another element against a crown having an inclined surface, so that the adjustment of the position of the member d ejection takes place by a relative rotation between the sleeve and this member. Thus, in a first embodiment, the ejection member is rotatable and the socket is kept fixed, and in an alternative embodiment, the socket is rotary and the ejection member is fixed. The socket and / or the ejection member may be provided with notches, a lug or similar means for defining its angular position relative to the counterpart. Advantageously, the sleeve which can be mounted on a part of the cylinder, and the ejection member are easily accessible and adjustable.
Des variantes du dispositif d'ajustement de position consistent à utiliser, par exemple, une douille dont la position est réglable par rapport à l'organe d'éjection et qui est montée sur cet organe de façon à former l'extrémité d'éjection de celui-ci. La douille et l'organe d'éjection peuvent avoir des parties respectives filetées, ou comporter d'autres moyens de fixation permettant d'ajuster la position de la douille en fonction de l'embout utilisé.Variants of the position adjustment device consist in using, for example, a socket whose position is adjustable relative to the ejection member and which is mounted on this member so as to form the ejection end of this one. The sleeve and the ejection member may have respective threaded parts, or may comprise other fixing means making it possible to adjust the position of the sleeve as a function of the endpiece used.
Une autre variante consiste à utiliser un dispositif d'ajustement de position qui permet de modifier la position limite de l'organe d'éjection par une variation de la course de l'organe d'éjection par rapport au cylindre. L'organe d'éjection peut par exemple être couplé à son dispositif d'actionnement par l'intermédiaire d'un organe de longueur variable de manière à modifier au moins une position limite de l'organe d'actionnement.Another variant consists in using a position adjustment device which makes it possible to modify the limit position of the ejection member by a variation of the stroke of the ejection member relative to the cylinder. The ejection member can for example be coupled to its actuating device via a member of variable length so as to modify at least one limit position of the actuating member.
D'autres aspects, buts et avantages de l'invention ressortiront de la description donnée ci-après, des dessins qui l'accompagnent et des revendications.Other aspects, objects and advantages of the invention will emerge from the description given below, the accompanying drawings and the claims.
A titre d'exemple, des modes de réalisation de l'invention sont décrits ci-après en faisant référence aux dessins, dans lesquels:By way of example, embodiments of the invention are described below with reference to the drawings, in which:
la Fig. 1 est une vue en coupe partielle d'une première forme d'exécution d'une pipette selon l'invention;Fig. 1 is a partial sectional view of a first embodiment of a pipette according to the invention;
la Fig. 2 est une vue en coupe partielle d'un ensemble piston-cylindre de la pipette de la Fig. 1 ;Fig. 2 is a partial sectional view of a piston-cylinder assembly of the pipette of FIG. 1;
la Fig. 3 est une vue agrandie, en coupe, selon la ligne lll-lll de la Fig. 2;Fig. 3 is an enlarged view, in section, along the line III-III of FIG. 2;
la Fig. 4 est une vue en coupe d'une deuxième forme d'exécution d'une pipette selon l'invention;Fig. 4 is a sectional view of a second embodiment of a pipette according to the invention;
la Fig. 5 est une vue en coupe partielle d'un ensemble piston-cylindre d'une troisième forme d'exécution; etFig. 5 is a partial sectional view of a piston-cylinder assembly of a third embodiment; and
les Figures 6 à 9 sont des vues partielles, en coupe, de variantes d'un dispositif d'ajustement de position disposé à proximité de l'extrémité du cylindre de la pipette.Figures 6 to 9 are partial views, in section, of variants of a position adjustment device disposed near the end of the pipette cylinder.
Les Figures 1 à 3 et la Fig. 4 montrent, respectivement, des pipettes 1 et 1 ' dont les parties analogues ont été désignées par le même chiffre de référence. Une telle pipette comporte un corps de pipette 2 muni d'un ensemble piston- cylindre 3, 4 usuel, un dispositif d'actionnement de piston 5 et un dispositif éjecteur 6. Le dispositif d'actionnement de piston 5 comporte un poussoir 7 agissant sur le piston 3 de l'ensemble piston-cylindre qui permet d'aspirer et/ou de refouler du liquide à travers un embout remplaçable 8 monté à l'extrémité 9 du cylindre 4 de l'ensemble piston-cylindre. Le cylindre 4 communique avec l'embout 8 par une ouverture 10 de son extrémité 9.Figures 1 to 3 and Fig. 4 show, respectively, pipettes 1 and 1 ′, the analogous parts of which have been designated by the same reference numeral. Such a pipette comprises a pipette body 2 provided with a usual piston-cylinder assembly 3, 4, a piston actuation device 5 and an ejector device 6. The piston actuation device 5 comprises a pusher 7 acting on the piston 3 of the piston-cylinder assembly which makes it possible to aspirate and / or pumping liquid through a replaceable nozzle 8 mounted at the end 9 of the cylinder 4 of the piston-cylinder assembly. The cylinder 4 communicates with the end piece 8 through an opening 10 at its end 9.
Le poussoir 7 du dispositif d'actionnement 5 du piston comporte un bouton 11 et une tige 12. La tige 12 est couplée au bouton 11 par l'intermédiaire d'une partie filetée 13, de façon à permettre le réglage de la position de la tige 12 et donc du piston 3 par rapport au cylindre pour déterminer le volume de liquide aspiré. D'autres dispositifs d'actionnement du piston 12 peuvent être prévus sans sortir du cadre de l'invention, l'actionnement pouvant être, par exemple, hydraulique ou électrique.The plunger 7 of the piston actuation device 5 comprises a button 11 and a rod 12. The rod 12 is coupled to the button 11 by means of a threaded part 13, so as to allow the position of the rod 12 and therefore of the piston 3 relative to the cylinder to determine the volume of liquid sucked. Other devices for actuating the piston 12 can be provided without departing from the scope of the invention, the actuation possibly being, for example, hydraulic or electric.
La tige 12 est couplée à son extrémité 14 d'une manière séparable au piston 3. Le piston 3 est muni de bras élastiques 15 ayant des creux 56 sur leur surface intérieure de façon à pouvoir coopérer avec l'extrémité 14 de la tige 12, qui est en forme de boule. Le couplage entre les bras élastiques 15 et l'extrémité 14 est donc rapidement séparable par application d'une certaine force de traction sur l'ensemble piston-cylindre par rapport au corps 2. Ceci permet, par exemple, d'échanger les ensembles piston-cylindre ayant des volumes d'aspiration différents ou de forme et de dimensions différentes pour être conformes à différentes normes, ou d'échanger les ensembles défectueux sans devoir remplacer l'appareil entier. La connexion entre les bras élastiques 15 et la boule 14 forment un ensemble de fiche et de prise avantageux du fait qu'il est très simple et rapide de déconnecter et de reconnecter les dispositifs.The rod 12 is coupled at its end 14 in a separable manner to the piston 3. The piston 3 is provided with elastic arms 15 having recesses 56 on their internal surface so as to be able to cooperate with the end 14 of the rod 12, which is shaped like a ball. The coupling between the elastic arms 15 and the end 14 is therefore quickly separable by application of a certain tensile force on the piston-cylinder assembly relative to the body 2. This makes it possible, for example, to exchange the piston assemblies -cylinder having different suction volumes or of different shape and dimensions to comply with different standards, or to exchange defective assemblies without having to replace the entire device. The connection between the elastic arms 15 and the ball 14 form an advantageous plug and socket assembly because it is very simple and quick to disconnect and reconnect the devices.
Le dispositif éjecteur 6 comporte un organe d'éjection 16 ou 16' ayant une partie tubulaire disposée de façon à pouvoir coulisser sur le cylindre 4, et un dispositif d'actionnement 17 de cet organe d'éjection. Le dispositif d'actionnement 17 comporte un poussoir 18 et une tige 19 reliant le poussoir à un organe de couplage 20 ou 20'. L'organe de couplage réalise une connexion séparable entre l'organe d'éjection 16 ou 16' et le dispositif d'actionnement 17 par encliquetage, par exemple par l'interaction de protubérances et de rainures formées sur des parties complémentaires. En poussant le poussoir 18 jusqu'à son arrêt, position dans laquelle il vient par exemple buter sur le manchon ou une partie 21 du corps 2 de la pipette, l'organe d'éjection 16 ou 16' est déplacé sur une distance déterminée par le déplacement de ce poussoir. L'extrémité 22 de l'organe d'éjection vient buter sur le bord supérieur 23 de l'embout pour séparer celui-ci du cylindre 4. Le poussoir 18 est avantageusement placé du même côté du corps de pipette que la griffe 21 , ce qui facilite l'actionnement du poussoir d'éjection bien accessible à l'opérateur. D'autre part, cette disposition rend le côté opposé du corps de pipette libre pour y agencer aisément un dispositif d'affichage.The ejector device 6 comprises an ejection member 16 or 16 ′ having a tubular part arranged so as to be able to slide on the cylinder 4, and an actuating device 17 of this ejection member. The actuating device 17 comprises a pusher 18 and a rod 19 connecting the pusher to a coupling member 20 or 20 '. The coupling member makes a separable connection between the ejection member 16 or 16 'and the actuating device 17 by snap-fastening, for example by the interaction of protuberances and grooves formed on complementary parts. By pushing the plunger 18 until it stops, position in which it abuts for example on the sleeve or a part 21 of the body 2 of the pipette, the ejection member 16 or 16 ′ is moved over a distance determined by the movement of this pusher. The end 22 of the ejection member abuts on the upper edge 23 of the nozzle to separate it from the cylinder 4. The pusher 18 is advantageously placed on the same side of the pipette body as the claw 21, this which facilitates the actuation of the ejection pusher easily accessible to the operator. On the other hand, this arrangement makes the opposite side of the pipette body free to easily arrange a display device there.
Dans la forme d'exécution montrée à la Fig. 4, le dispositif éjecteur comporte un dispositif d'ajustement de position 24 comprenant une partie filetée 25 à l'extrémité supérieure de la tige 19 qui est engagée dans une partie filetée complémentaire d'un alésage 26 du poussoir 18. La tête de la partie filetée 25 est accessible de l'extérieur pour permettre l'ajustement de la position de la tige 19 par rapport au poussoir 18, l'organe de couplage 20 permettant la rotation de la tige 19. Cette rotation déplace l'organe d'éjection 16 par rapport au cylindre 4. La position de l'extrémité 22 de l'organe d'éjection 16 peut donc être ajustée pour permettre l'éjection d'embouts 8 ayant des bords supérieurs situés à des hauteurs différentes par rapport à l'extrémité 9 du cylindre.In the embodiment shown in FIG. 4, the ejector device comprises a position adjustment device 24 comprising a threaded part 25 at the upper end of the rod 19 which is engaged in a threaded part complementary to a bore 26 of the pusher 18. The head of the part threaded 25 is accessible from the outside to allow adjustment of the position of the rod 19 relative to the pusher 18, the coupling member 20 allowing the rotation of the rod 19. This rotation displaces the ejection member 16 relative to the cylinder 4. The position of the end 22 of the ejection member 16 can therefore be adjusted to allow the ejection of end pieces 8 having upper edges situated at different heights relative to the end 9 of the cylinder.
Dans une variante, la position du poussoir 18 est ajustée pour varier la course de l'organe d'actionnement déterminée par la distance entre la position limite haute du poussoir et le manchon ou la griffe 21. La variation de la course du poussoir 18 modifie ainsi également la position limite de l'extrémité 22 de l'organe d'éjection atteinte lors de l'actionnement de l'éjecteur. On obtient ainsi une éjection fiable d'embouts ayant des positions et/ou des dimensions différentes.In a variant, the position of the pusher 18 is adjusted to vary the stroke of the actuating member determined by the distance between the upper limit position of the pusher and the sleeve or the claw 21. The variation of the stroke of the pusher 18 modifies thus also the limit position of the end 22 of the ejection member reached during actuation of the ejector. This produces a reliable ejection of tips having different positions and / or dimensions.
Les Figures 1 à 3 montrent une forme d'exécution préférée de l'invention. Dans cet exemple, le dispositif d'ajustement de position 24' comporte une douille 27 montée autour du cylindre 4 à proximité de l'extrémité supérieure de celui-ci. La douille 27 présente une rainure périphérique 28 dans laquelle pénètre une partie saillante de l'organe de couplage 20' connecté à la tige d'actionnement 19. Dans une forme d'exécution, la douille 27 peut tourner autour de son axe, tout en étant solidaire, dans le sens axial, du dispositif d'actionnement de l'organe d'éjection 16'. Un filetage intérieur 29 de la douille 27 coopère avec un filetage 30 sur la partie supérieure de l'organe d'éjection 16', de sorte qu'une rotation de la douille permet d'éloigner ou de rapprocher l'extrémité 22 de l'organe d'éjection de l'extrémité 9 du cylindre 4. La surface intérieure de la douille présente une série d'encoches axiales 31 dans lesquelles un godron 32 de la périphérie de la partie supérieure de l'organe 16' peut s'engager de manière à définir la position angulaire de la douille par rapport à cet organe. L'organe 16' est empêché de tourner autour de son axe et se déplace donc dans le sens axial par rapport au cylindre 4 lors du réglage de sa position par rotation de la douille 27. Dans une autre forme d'exécution, la douille 27 est fixe et l'organe 16' est monté de façon rotative, de sorte qu'une rotation de l'organe d'éjection permet d'éloigner ou de rapprocher l'extrémité 22 de l'extrémité 9 du cylindre 4.Figures 1 to 3 show a preferred embodiment of the invention. In this example, the position adjustment device 24 ′ comprises a socket 27 mounted around the cylinder 4 near the upper end of the latter. The socket 27 has a peripheral groove 28 into which a projecting part of the coupling member 20 'connected to the actuating rod 19 penetrates. In one embodiment, the socket 27 can rotate around its axis, while being integral, in the axial direction, with the actuating device of the ejection member 16 '. An internal thread 29 of the sleeve 27 cooperates with a thread 30 on the upper part of the ejection member 16 ', so that a rotation of the sleeve makes it possible to move the end 22 of the ejection member away from or closer to the end 9 of the cylinder 4. The inner surface of the sleeve has a series of axial notches 31 in which a godron 32 of the periphery of the upper part of the member 16 'can engage so as to define the angular position of the sleeve with respect to to this organ. The member 16 'is prevented from rotating about its axis and therefore moves in the axial direction relative to the cylinder 4 when adjusting its position by rotation of the sleeve 27. In another embodiment, the sleeve 27 is fixed and the member 16 'is rotatably mounted, so that a rotation of the ejection member makes it possible to move the end 22 away from or closer to the end 9 of the cylinder 4.
Selon la forme d'exécution de la Fig. 5, le dispositif éjecteur comporte un dispositif d'ajustement de position 24" muni d'une douille 27' fixe et d'un organe d'éjection 16" monté de façon à permettre sa rotation sur le cylindre 4. L'organe d'éjection est muni d'une pièce 32 avec un ergot 32" qui s'engage dans des crans 31' d'une couronne 29' ayant une surface d'engagement inclinée annulaire 29". Les crans 31' disposés à des intervalles sur le pourtour de la couronne définissent ainsi des positions différentes en hauteur pour le réglage de la position de l'extrémité 22 de l'organe d'éjection 16". Un ressort 55 agissant sur la douille 27' et sur l'organe 16" assure l'engagement de l'ergot 32" dans un des crans 31 '. Le dispositif piston-cylindre de la Fig. 5 peut aussi comporter un piston et des moyens pour permettre le couplage rapide à un corps de pipette similaire aux moyens décrits ci-dessus en rapport avec la forme d'exécution de la Fig. 2.According to the embodiment of FIG. 5, the ejector device comprises a position adjustment device 24 "provided with a fixed socket 27 'and an ejection member 16" mounted so as to allow its rotation on the cylinder 4. The member ejection is provided with a part 32 with a lug 32 "which engages in notches 31 'of a crown 29' having an annular inclined engagement surface 29". The notches 31 ′ arranged at intervals around the periphery of the crown thus define different height positions for adjusting the position of the end 22 of the ejection member 16 ". A spring 55 acting on the bush 27 'and on the member 16 "ensures the engagement of the lug 32" in one of the notches 31'. The piston-cylinder device of FIG. 5 can also include a piston and means for allowing rapid coupling to a pipette body similar to the means described above in relation to the embodiment of Fig. 2.
D'autres formes d'exécution de dispositifs d'ajustement de position sont réalisables sans sortir du cadre de l'invention. En particulier, une douille d'ajustement peut être montée sur une partie d'extrémité de l'organe d'éjection, selon les variantes montrées aux Figures 6 à 9, pour former un bord d'éjection 22' dont la position peut être ajustée par rapport au cylindre 4 de la pipette.Other embodiments of position adjustment devices can be carried out without departing from the scope of the invention. In particular, an adjustment sleeve can be mounted on an end part of the ejection member, according to the variants shown in Figures 6 to 9, to form an ejection edge 22 'whose position can be adjusted relative to cylinder 4 of the pipette.
Dans les variantes des Figures 6 et 9, une douille 33 ou 33' est montée sur la partie 34 ou 34' de l'organe d'éjection qui présente un filetage 35 ou 35' coopérant avec un filetage complémentaire de la douille. Selon la Fig. 9, des stries de crantage 36 sont formées sur le fond du filet pour permettre une bonne définition de la position angulaire de la douille 33. Dans la variante de la Fig.6, le crantage est déplacé sur la partie cylindrique 37 de l'organe d'éjection et formé par un ensemble encoches-godrons 38 sur cette partie et la douille 33'.In the variants of Figures 6 and 9, a socket 33 or 33 'is mounted on the part 34 or 34' of the ejection member which has a thread 35 or 35 ' cooperating with a complementary thread of the sleeve. According to FIG. 9, notching grooves 36 are formed on the bottom of the thread to allow a good definition of the angular position of the sleeve 33. In the variant of FIG. 6, the notching is moved on the cylindrical part 37 of the member ejection and formed by a set of notches-gadroons 38 on this part and the socket 33 '.
La Fig. 7 montre une variante selon laquelle une douille 39 est montée sur une partie d'extrémité 40 de l'organe d'éjection par l'intermédiaire d'ergots, tels que 41 , qui sont positionnés dans des rainures correspondantes agencées sur le pourtour de la partie 40. Ces rainures, telles que 42, 43, 44, ont des hauteurs différentes qui permettent de définir des positions correspondantes de la douille par rapport à l'organe d'éjection. Le guidage de la douille est assuré par le cylindre 4 sur lequel elle coulisse.Fig. 7 shows a variant in which a socket 39 is mounted on an end portion 40 of the ejection member by means of lugs, such as 41, which are positioned in corresponding grooves arranged on the periphery of the part 40. These grooves, such as 42, 43, 44, have different heights which make it possible to define corresponding positions of the sleeve relative to the ejection member. The guide of the sleeve is provided by the cylinder 4 on which it slides.
Dans la variante de la Fig. 8, une douille 39' est munie de languettes longitudinales 50, munies à leurs extrémités libres de protubérances 51 agencées de façon à pouvoir pénétrer dans des lucarnes, telles que 52, 53, 54, situées à des hauteurs différentes dans la partie 40' de l'organe d'éjection.In the variant of FIG. 8, a socket 39 'is provided with longitudinal tabs 50, provided at their free ends with protrusions 51 arranged so as to be able to penetrate in dormers, such as 52, 53, 54, located at different heights in the part 40' of the ejection member.
Ainsi, dans les formes d'exécution des Figures 6 à 9, la position limite de l'extrémité de l'organe d'éjection est ajustable au niveau de cette extrémité de manière à obtenir une éjection efficace pour des embouts dont le bord supérieur se situe à des hauteurs différentes par rapport au cylindre de la pipette. Thus, in the embodiments of Figures 6 to 9, the limit position of the end of the ejection member is adjustable at this end so as to obtain an effective ejection for end pieces whose upper edge is located at different heights from the pipette cylinder.

Claims

Revendications claims
1. Pipette pour le transfert de liquides comportant au moins un ensemble piston-cylindre (3, 4) dans lequel le cylindre (4) est agencé de façon à pouvoir être muni d'un embout (8) remplaçable, destiné à contenir le liquide à transférer, un dispositif d'actionnement de piston (5) pour effectuer l'aspiration et le refoulement de liquide, et un dispositif éjecteur d'embouts (6), le dispositif éjecteur comportant un organe d'éjection (16, 16') déplaçable le long du cylindre pour éjecter un embout (8) de l'extrémité du cylindre, et un dispositif d'actionnement (17) de l'organe d'éjection, caractérisée en ce que le dispositif éjecteur (6) comporte un dispositif d'ajustement de position (24, 24', 24", 33, 33', 39, 39') agencé de façon à permettre de modifier la position limite d'une extrémité d'éjection (22, 22') du dispositif éjecteur atteinte en fin de course.1. Pipette for transferring liquids comprising at least one piston-cylinder assembly (3, 4) in which the cylinder (4) is arranged so that it can be provided with a replaceable nozzle (8), intended to contain the liquid to be transferred, a piston actuating device (5) for carrying out the suction and delivery of liquid, and a nozzle ejector device (6), the ejector device comprising an ejection member (16, 16 ') movable along the cylinder to eject a nozzle (8) from the end of the cylinder, and an actuating device (17) of the ejection member, characterized in that the ejecting device (6) comprises a device 'position adjustment (24, 24', 24 ", 33, 33 ', 39, 39') arranged to allow modification of the limit position of an ejection end (22, 22 ') of the ejector device reached at the end of the race.
2. Pipette selon la revendication 1 , caractérisée en ce que le dispositif d'ajustement de position (24,24',24") comporte une douille (27, 27', 33, 33', 39, 39') montée de façon à permettre un déplacement relatif entre une partie de l'organe d'éjection et ladite douille.2. Pipette according to claim 1, characterized in that the position adjustment device (24,24 ', 24 ") comprises a socket (27, 27', 33, 33 ', 39, 39') mounted so to allow relative movement between a part of the ejection member and said socket.
3. Pipette selon la revendication 2, caractérisée en ce que la douille (27, 33, 33') et l'organe d'éjection comportent des parties filetées complémentaires (29, 30; 35, 35') coopérant pour permettre d'effectuer ledit déplacement relatif.3. Pipette according to claim 2, characterized in that the sleeve (27, 33, 33 ') and the ejection member comprise complementary threaded parts (29, 30; 35, 35') cooperating to allow carrying out said relative displacement.
4. Pipette selon la revendication 1 ou 2, caractérisée en ce que le dispositif d'ajustement de position (24") comporte au moins un ergot (32") disposé sur l'organe d'éjection ou sur une contrepartie fixe et s'engageant dans des crans (31') disposés sur une surface inclinée (29") annulaire de la contrepartie fixe ou de l'organe d'éjection, respectivement.4. Pipette according to claim 1 or 2, characterized in that the position adjustment device (24 ") comprises at least one lug (32") disposed on the ejection member or on a fixed counterpart and s' engaging in notches (31 ') arranged on an inclined annular surface (29 ") of the fixed counterpart or of the ejection member, respectively.
5. Pipette selon la revendication 4, caractérisée en ce que le dispositif d'ajustement de position comporte un ressort (55) appuyant sur l'organe d'éjection (16") pour assurer que l'ergot (32") s'engage dans un des crans (31 ').5. Pipette according to claim 4, characterized in that the position adjustment device comprises a spring (55) pressing on the ejection member (16 ") to ensure that the lug (32") engages in one of the notches (31 ').
6. Pipette selon l'une des revendications 2 à 5, caractérisée en ce que la douille (27, 27', 33, 33') et l'organe d'éjection comportent un agencement (31 , 32; 31', 32"; 36, 38) permettant de définir des positions angulaires relatives entre cet organe et la douille.6. Pipette according to one of claims 2 to 5, characterized in that the sleeve (27, 27 ', 33, 33') and the ejection member have an arrangement (31, 32; 31 ', 32 "; 36, 38) making it possible to define relative angular positions between this member and the socket.
7. Pipette selon l'une des revendications 2 à 6, ou la revendication 4, caractérisée en ce que la douille (27) est disposée à proximité d'une extrémité (28) du cylindre (4) éloignée de l'extrémité (9) sur laquelle est placé l'embout (8).7. Pipette according to one of claims 2 to 6, or claim 4, characterized in that the sleeve (27) is arranged near one end (28) of the cylinder (4) remote from the end (9 ) on which the end piece (8) is placed.
8. Pipette selon l'une des revendications précédentes, caractérisée en ce que le dispositif d'ajustement de position (24') comporte un agencement (20, 20') permettant une connexion séparable entre une tige d'actionnement d'éjection (19) et l'organe d'éjection (16, 16').8. Pipette according to one of the preceding claims, characterized in that the position adjustment device (24 ') has an arrangement (20, 20') allowing a separable connection between an ejection actuation rod (19 ) and the ejection member (16, 16 ').
9. Pipette selon la revendication 1 , caractérisée en ce que le dispositif d'ajustement de position (24) est agencé de façon à permettre de modifier la course de l'organe d'éjection (16) par rapport au cylindre (4) de la pipette.9. Pipette according to claim 1, characterized in that the position adjustment device (24) is arranged so as to allow the stroke of the ejection member (16) to be modified relative to the cylinder (4) of the pipette.
10. Pipette selon la revendication 1 , caractérisée en ce que le dispositif d'ajustement de position (24, 24') est agencé de façon à permettre de modifier la position de l'organe d'éjection (16, 16') ou d'une partie solidaire de celui-ci (33, 33', 39, 39') par rapport au cylindre (4) de la pipette.10. Pipette according to claim 1, characterized in that the position adjustment device (24, 24 ') is arranged so as to allow the position of the ejection member (16, 16') to be modified or d 'an integral part thereof (33, 33', 39, 39 ') relative to the cylinder (4) of the pipette.
11. Pipette selon la revendication 9 ou la revendication 10, caractérisée en ce que le dispositif d'ajustement de position (24) comporte une tige d'actionnement (19) et un organe poussoir (18) couplés de façon à permettre de modifier la position de cette tige par rapport audit organe poussoir.11. Pipette according to claim 9 or claim 10, characterized in that the position adjustment device (24) comprises an actuating rod (19) and a pusher member (18) coupled so as to allow modification of the position of this rod relative to said pusher member.
12. Pipette pour le transfert de liquide comportant au moins un ensemble piston-cylindre (3, 4) dans lequel le cylindre (4) est agencé de façon à pouvoir être muni d'un embout (8) remplaçable, destiné à contenir le liquide à transférer, un dispositif d'actionnement de piston (5) pour effectuer l'aspiration et le refoulement de liquide, et un dispositif éjecteur d'embouts (6), le dispositif éjecteur comportant un organe d'éjection (16, 16') déplaçable le long du cylindre pour éjecter un embout (8) de l'extrémité du cylindre, et un dispositif d'actionnement (17) de l'organe d'éjection, le dispositif d'actionnement de piston (5) comprenant un corps de pipette (2) avec une griffe (21 ) dans sa partie supérieure proche d'un poussoir (7) d'actionnement de piston, caractérisée en ce que le dispositif éjecteur (6) comporte un poussoir (18) disposé du même côté du corps de pipette que la griffe (21 ), à proximité de celle-ci.12. Pipette for transferring liquid comprising at least one piston-cylinder assembly (3, 4) in which the cylinder (4) is arranged so as to be able to be provided with a replaceable nozzle (8), intended to contain the liquid to be transferred, a piston actuating device (5) for carrying out the suction and delivery of liquid, and a nozzle ejector device (6), the ejector device comprising an ejection member (16, 16 ') movable along the cylinder to eject a nozzle (8) from the end of the cylinder, and an actuating device (17) of the ejection member, the actuating device piston (5) comprising a pipette body (2) with a claw (21) in its upper part close to a plunger actuator (7), characterized in that the ejector device (6) comprises a plunger ( 18) disposed on the same side of the pipette body as the claw (21), close to the latter.
13. Pipette pour le transfert de liquide comportant au moins un ensemble piston-cylindre (3, 4) dans lequel le cylindre (4) est agencé de façon à pouvoir être muni d'un embout (8) remplaçable, destiné à contenir le liquide à transférer, un dispositif d'actionnement de piston (5) pour effectuer l'aspiration et le refoulement de liquide, et un dispositif éjecteur d'embouts (6), le dispositif éjecteur comportant un organe d'éjection (16, 16') déplaçable le long du cylindre pour éjecter un embout (8) de l'extrémité du cylindre, et un dispositif d'actionnement (17) de l'organe d'éjection, caractérisée en ce que le dispositif d'actionnement (17) de l'organe d'éjection est connecté de manière séparable à l'organe d'éjection (16, 16') par des moyens d'encliquetage. 13. Pipette for transferring liquid comprising at least one piston-cylinder assembly (3, 4) in which the cylinder (4) is arranged so as to be able to be provided with a replaceable nozzle (8), intended to contain the liquid to be transferred, a piston actuating device (5) for carrying out the suction and delivery of liquid, and a nozzle ejector device (6), the ejector device comprising an ejection member (16, 16 ') movable along the cylinder to eject a nozzle (8) from the end of the cylinder, and an actuating device (17) of the ejecting member, characterized in that the actuating device (17) of the 'ejection member is separably connected to the ejection member (16, 16') by latching means.
EP99917735A 1999-05-18 1999-05-18 Pipette with tip ejector Expired - Lifetime EP1185368B1 (en)

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EP (1) EP1185368B1 (en)
AT (1) ATE249885T1 (en)
AU (1) AU3593199A (en)
DE (1) DE69911474T2 (en)
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FR2287941A1 (en) * 1974-10-15 1976-05-14 Marteau D Autry Eric DEVICE FOR EJECTING THE REMOVABLE TIP OF A PIPETTE
US4965050A (en) * 1989-01-18 1990-10-23 Ballard Medical Products Adaptation of pipetter
GB2249172A (en) * 1990-10-26 1992-04-29 N Proizv Ob Biolog Priborostro Multichannel pipette
WO1996037302A1 (en) * 1995-05-26 1996-11-28 Rainin Instrument Co., Inc. Pipette tip ejector
DE19708151A1 (en) * 1997-02-28 1998-09-10 Eppendorf Geraetebau Netheler Pipette

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US4009611A (en) * 1976-05-13 1977-03-01 Oxford Laboratories Inc. Hand-held micropipettor with improved pipette tip ejector
US5320810A (en) * 1992-05-13 1994-06-14 Integrated Instrument Services, Inc. Pipette with an axially stationary volume adjusting wheel
FR2807342B1 (en) * 2000-04-07 2002-07-12 Gilson Sa CONCEAL EJECTOR PIPETTE
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EP1329262B1 (en) * 2002-01-16 2009-08-19 Brand Gmbh + Co Kg Pipette and method of manufacturing a pipette

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2287941A1 (en) * 1974-10-15 1976-05-14 Marteau D Autry Eric DEVICE FOR EJECTING THE REMOVABLE TIP OF A PIPETTE
US4965050A (en) * 1989-01-18 1990-10-23 Ballard Medical Products Adaptation of pipetter
GB2249172A (en) * 1990-10-26 1992-04-29 N Proizv Ob Biolog Priborostro Multichannel pipette
WO1996037302A1 (en) * 1995-05-26 1996-11-28 Rainin Instrument Co., Inc. Pipette tip ejector
DE19708151A1 (en) * 1997-02-28 1998-09-10 Eppendorf Geraetebau Netheler Pipette

Also Published As

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ES2207204T3 (en) 2004-05-16
ATE249885T1 (en) 2003-10-15
DE69911474T2 (en) 2004-07-22
EP1185368B1 (en) 2003-09-17
DE69911474D1 (en) 2003-10-23
AU3593199A (en) 2000-12-05
WO2000069562A1 (en) 2000-11-23
US6833114B1 (en) 2004-12-21

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