Pipetting device and method for processing fluid samples - Patents.com

Abstract

The present invention relates to a pipetting device for processing a fluid sample 71, comprising a receiving element 11, a pipette tip 12 detachably arranged on the receiving element 11, and a displacement element 14 flow-connected to the pipette tip 12 to generate a flow for receiving and / or ejecting the fluid sample 71. The pipetting device 1 has an optically transparent extension 13 detachably arranged on the pipette tip 12 such that the extension 13 is flow-connected to the displacement element 14 via the pipette tip 12, such that the fluid sample 71 can be received into and / or ejected from the extension 13 by a flow that can be generated by the displacement element 14. The pipetting device is preferably used in an optical measurement system.

Description

[Technical field]

[0001] The invention relates to a pipetting device for processing fluid samples, an optically transparent extension for a pipetting device according to the invention, an automated laboratory apparatus for processing fluid samples and a method for processing a fluid sample according to the preamble of the independent claims. [Background technology]

[0002] When processing multiple samples, multiple processing steps must be performed and for this purpose automated laboratory equipment is usually used, since it must be ensured that reagents are pipetted accurately into and out of containers such as microwell plates.

[0003] Here, a state-of-the-art automated laboratory apparatus typically comprises a processing chamber in which samples are introduced into containers, a pipetting device for performing the processing steps, a moving device for moving the pipetting device within the processing chamber, and an electronic control device for controlling and directing the pipetting device and other parts of the automated laboratory apparatus for performing the processing steps.

[0004] Thus, the use of automated laboratory equipment ensures increased efficiency and improved throughput of the automated sample preparation process.

[0005] However, pipetting devices are not only used in automated laboratory equipment, but are also commonly used to administer liquids. These liquids are received and dispensed through a tip opening into the pipette tip of the pipetting device. For this purpose, a displacement element, in particular a displacement element for gas, is incorporated into the pipetting device, which is flow-connected to the pipette tip by a receiving element for the pipette tip. An air cushion is displaced by this displacement element so that the liquid is sucked into the pipette tip and expelled from it. The displacement element is usually a cylinder with a displaceable piston in it.

[0006] The pipette tip is removably connected to the receiving element so that it can be replaced with a new pipette tip after use. In this way, contamination of subsequent dosing operations can be avoided. Disposable pipette tips are available cheaply from plastic.

[0007] The receiving element in particular has a protrusion for attaching the pipette tip, preferably a cylindrical or conical protrusion, on which the pipette tip can be fixed with a close-fitting insertion opening or receiving part, by pressing the protrusion into the insertion opening of the pipette tip in the holder, without touching the pipette tip.

[0008] To avoid contamination, the pipetting device preferably comprises a drive device and an ejection device with an ejector. By activating the drive device, the ejector is displaced so as to disengage the pipette tip from the projection without the need for user touch. For this purpose, the drive device usually comprises a mechanism that can be activated manually by a button (or automatically in case of automated laboratory equipment) in order to disengage the pipette tip from the receiving element.

[0009] Extremely small volumes in the microliter and picoliter range can also be processed with pipetting devices, which are particularly useful for the processing of biochemical / biotechnological samples, including biological samples such as biomolecules (e.g., DNA, RNA, or proteins).

[0010] Automated laboratory equipment also often incorporates optical detection devices for analyzing samples, which are typically performed by optical techniques such as spectroscopy or photometry.

[0011] For biomolecules in particular, luminescence spectroscopy is an important analytical method in which the luminescence generated upon photon absorption by the biomolecules is evaluated.

[0012] For this purpose, fluorescent labels allow the attachment of fluorescent chemical groups to large biomolecules, which serve as landmarks for the biomolecules.

[0013] In many processes, the concentration of a fluid sample (i.e. molecules of interest in solution) plays an important role, especially for further processing, and can be easily determined, especially by fluorescence spectroscopy. The optical density (a measure of the attenuation of radiation after passing through a medium) can also be used to determine the concentration.

[0014] However, optical analysis of fluid samples with this detection device is typically very time consuming and requires expensive analytical equipment for storage / receiving the fluid samples. Summary of the Invention [Problem to be solved by the invention]

[0015] It is therefore an object of the present invention to provide a pipetting device, an automated laboratory apparatus, and a method for processing fluid samples, which avoids these adverse effects known from the state of the art. [Means for solving the problem]

[0016] This object is met by a pipetting device, an automated laboratory apparatus and a method for processing fluid samples having the features of the independent claims.

[0017] The dependent claims relate to particularly advantageous embodiments of the invention.

[0018] According to the present invention, a pipetting device for processing fluid samples is presented, comprising a receiving element, a pipette tip removably arranged on the receiving element, and a displacement element flow-connected to the pipette tip for generating a flow for receiving and / or expelling the fluid sample.

[0019] The pipetting device further comprises an optically transparent extension that is removably disposed on the pipette tip such that the extension is flow-connected to the displacement element via the pipette tip, such that a fluid sample can be admitted to the extension and / or expelled from the extension by a flow that can be generated by the displacement element.

[0020] Within the framework of the present invention, the fact that the pipette tip is flow-connected to the displacement element can be understood to mean in particular that a first internal space of the pipette tip (suitable for receiving a liquid or a fluid sample) is connected to the displacement element in such a way that a flow connection to the extension can be established via the first internal space by actuation of the displacement element (or a fluid sample or a liquid can be received in the first internal space if the pipetting device is used without an extension). Within the framework of the present invention, the fact that the extension is flow-connected to the displacement element via the pipette tip can be understood to mean in particular that a second internal space of the extension (also suitable for receiving a liquid or a fluid sample) is connected to the first internal space in such a way that a fluid sample (or a liquid) can be received in the second internal space by actuation of the displacement element, since there is a flow connection to the displacement element via the first internal space.

[0021] According to the invention, optically transparent extensions for pipetting devices according to the invention are further presented, which consist of amorphous polymers. The extensions can in particular comprise plastics, in particular consisting of cycloolefin copolymers. Cycloolefin copolymers are usually obtained by copolymerization of cycloolefins with alk-1-enes with metallocene catalysts. In contrast to semi-crystalline polymers such as polyethylene and polypropylene, cycloolefin copolymers are amorphous and therefore optically transparent. Due to their low birefringence and optical transparency, cycloolefin copolymers can be particularly preferably used for optical analysis according to the invention (in detection devices).

[0022] According to the present invention there is further provided an automated laboratory apparatus for processing fluid samples comprising a processing chamber for receiving a fluid sample, a pipetting device according to the present invention arranged in the processing chamber for performing at least one processing step on the fluid sample, a moving device arranged moveably in at least a first spatial direction of the processing chamber and connected to the pipetting device such that the pipetting device can be moved through the processing chamber by the moving device, a detection device arranged in the processing chamber for analyzing the fluid sample, and an electronic control device signal-connected to the pipetting device, the moving device and the detection device.

[0023] Additionally, a method according to the present invention is presented for processing a fluid sample using an automated laboratory apparatus, comprising the steps of preparing the automated laboratory apparatus, introducing a fluid sample into a processing chamber, receiving the fluid sample into an optically transparent extension by a pipetting device, moving the pipetting device through the processing chamber to a detection device by a moving device, introducing the optically transparent extension with the fluid sample into the detection device, and analyzing the fluid sample by the detection device.

[0024] Within the framework of the present invention, "optically transparent" means that the extension (at least a region of the extension) is transparent to electromagnetic waves / radiation, in particular to electromagnetic waves / radiation in the ultraviolet / visible range and / or near infrared range, respectively, for primary radiation.

[0025] By means of the optically transparent extension according to the invention, in particular the advantage is achieved that the part of the pipette tip for analyzing the fluid sample does not have to consist of an optically transparent material, in particular an amorphous polymer, thereby reducing the cost of the disposable tip.

[0026] Within the framework of the present application, "detachable" can be understood as meaning that both the pipette tip and the extension are not rigidly attached and can be easily removed and therefore easily discarded, especially as a disposable pipette tip / extension.

[0027] Within the framework of the present invention, the term "fluid sample" may be understood to mean a sample having a fluid that contains substances such as biological molecules (especially DNA, RNA, nucleic acids, proteins, cells and cell components, monomers) or other chemicals. Within the framework of the present invention, the fluid may for example be a suitable solvent.

[0028] In the pipetting device according to the invention, the displacement element can be integrated in the receiving element, in particular arranged inside the receiving element, whereby the displacement element can be designed as a piston displaceable in the receiving element.

[0029] The extension according to the invention has a mounting area and a measurement area arranged on the mounting area, by means of which the extension is arranged on the pipette tip, in which the analysis of the fluid sample can be carried out. For this purpose, the measurement area can be of a special shape, in particular the cross-sectional shape of the measurement area perpendicular to the dispensing axis can be rectangular or square. In fact, the cross-sectional shape of the optically transparent extension perpendicular to the dispensing axis can also simply be rectangular or square. In this case, the extension can be fixed against twisting by form-locking with the pipette tip. Thus, no alignment of the extension before the analysis is necessary.

[0030] In fact, the attachment area may be located at the (opening) dispensing area of ​​the pipette tip, where a fluid sample can be received at and expelled from the pipette tip.

[0031] In an embodiment of the invention, the detection device may comprise a radiation source for irradiating the fluid sample with primary radiation and a detector for receiving secondary radiation arising from the fluid sample (for analysis of the fluid sample). The radiation source thus generates electromagnetic radiation (primary radiation). The secondary radiation is in particular electromagnetic secondary radiation emitted / arising from the fluid sample, which secondary radiation is caused by the interaction of the primary radiation with the fluid sample.

[0032] Here, it is particularly preferred that ultraviolet / visible radiation, in particular in the wavelength range of 190-1000 nm, in particular 365-720 nm, and / or near infrared radiation is used as primary radiation. Diodes, in particular silicon photodiodes or vacuum photodiodes, are particularly suitable as detectors. As radiation sources, lasers, deuterium lamps, tungsten lamps, halogen lamps, mercury lamps or LEDs (Light emitting diodes) can be used.

[0033] In fact, the detection device can also have several detectors and / or radiation sources. The radiation sources can emit different wavelengths or wavelength ranges as primary radiation. Here, the use of two radiation sources is particularly preferred, which are designed as a first radiation source (preferably a first LED) with a first wavelength (for example 450-490 nm) and a second radiation source (preferably a second LED) with a second wavelength (for example 600-630 nm). If several radiation sources are present, the analysis can be performed confocally. Thus, the beam paths of the primary radiation from the different radiation sources are directed to a common focal point within the fluid sample.

[0034] The detection device may therefore be a photometer, in particular a spectrometer, in particular a fluorometer, which measures parameters of the fluorescence of a fluid sample: the intensity and the wavelength distribution of the emission spectrum (of the secondary radiation) after excitation by a primary radiation.

[0035] However, within the framework of the present invention, it is particularly preferred to use absorption measurements as the measurement principle, whereby a radiation source generates primary radiation in the ultraviolet / visible and / or near infrared range (in particular at a single wavelength such as 280 nm) and a light beam (secondary radiation) attenuated by passing through the sample and the extension is captured by a detector. To characterize the absorption intensity, it is preferred to use absorbance or optical density (a measure for the attenuation of the primary radiation in the medium (sample and extension)).

[0036] The absorption of the fluid sample is preferably measured by placing the fluid sample in an extension according to the invention at a measurement point of a detection device between the radiation source and the detector.

[0037] In a particularly preferred embodiment of the method according to the invention, liquid is received in and expelled from the pipette tip before receiving the fluid sample in the optically transparent extension. This liquid can therefore be moved by the pipetting device through the processing chamber, in particular between different containers / wells. Afterwards, in the method according to the invention, the extension can then be placed on the pipette tip and the fluid sample can be received in the extension for analysis. This has the advantage that the fluid sample can be analyzed without changing the pipette tip (after using the pipette tip) but simply by attaching the extension. This is particularly advantageous if, for example, liquid is introduced into the fluid sample from the pipette tip and then the fluid sample is received in the extension after the extension has been attached. Without changing the pipette tip, contamination is avoided and analysis of the fluid sample is possible.

[0038] In practice, the analysis may comprise the steps of irradiating the fluid sample with primary radiation by a radiation source of the detection device and capturing secondary radiation arising from the fluid sample by a detector of the detection device During the analysis, the concentration of the fluid sample may also be determined based on the secondary radiation.

[0039] Indeed, containers are usually placed in the processing chamber to receive the fluid samples, in particular the containers can be microtiter plates, where the microtiter plates have a number of wells for receiving these (or various) fluid samples.

[0040] In fact, the pipetting device may have an ejection device known from the state of the art, with a drive device and an ejector, for ejecting the pipette tip by activating the drive device, by displacing the ejector so as to disengage the pipette tip from the receiving element without the need for a user's touch. In addition, the ejection device may have an extension ejector for ejecting the extension by activating the drive device, by displacing the extension ejector so as to disengage the extension from the pipette tip without the need for a user's touch. For this purpose, the extension ejector may be designed as a sleeve, which moves around the pipette tip to the extension and has a larger radius than the pipette tip and a smaller radius than the extension, so that only the extension is ejected. In addition, the extension ejector may have a gripping mechanism, which fixes the pipette tip during the ejection of the extension. This extension ejector makes it possible to use the pipette tip for further steps after ejecting the extension.

[0041] The fact that the electronic control device is signal-connected to the pipetting device, the movement device and the detection device means that in an operational state the control device sends control signals to the pipetting device, the movement device and the detection device for performing processing steps, and can also receive signals from the pipetting device, the movement device and the detection device.

[0042] The signal connection can be made by cable connection or wirelessly. In case of wireless signal connection, the data / signal transmission is made through free space (air or vacuum) as the transmission medium. The transmission can be made by directional or non-directional electromagnetic waves, and the frequency band used can range from a few Hertz (low frequency) to several hundred Terahertz (visible light) depending on the application and the technology used. Preferably, Bluetooth or WLAN is used for this purpose. Thus, not only can the detection device be controlled by the control device, but also, after the fluid sample is analyzed, the measurement data can be transmitted to the control device for evaluation, for example, to determine the concentration of the fluid sample before further processing.

[0043] Of course, in order to be able to flexibly move the detection device throughout the automated laboratory apparatus, the movement device is preferably also able to move in a second spatial direction of the processing chamber perpendicular to the first spatial direction, as well as in a third spatial direction of the processing chamber perpendicular to the first and second spatial directions. The movement device is preferably driven by an electric motor, such as a servo motor, and can be moved, for example, as a freely movable arm or via a rail.

[0044] In the method according to the invention (or in an operating state), the pipetting device can therefore be moved in all spatial directions (first, second and third spatial directions within the framework of the present application) in the processing chamber by the moving device.

[0045] An advantage of the pipetting device according to the invention is, in particular, that already existing pipetting devices can be replaced by a pipetting device according to the invention, so that known automated laboratory apparatus can be easily retrofitted into an automated laboratory apparatus according to the invention.

[0046] The present invention will now be described in more detail based on embodiments with reference to the drawings. [Brief description of the drawings]

[0047] [Figure 1] FIG. 1 is a schematic diagram of an automated laboratory apparatus according to the present invention. [Diagram 2] FIG. 2 is a schematic diagram of a further embodiment of an automated laboratory apparatus according to the present invention; [Figure 3A] FIG. 2 is a schematic diagram of the use of a pipetting device according to the present invention. [Figure 3B] FIG. 2 is a schematic diagram of the use of a pipetting device according to the present invention. [Figure 3C] FIG. 2 is a schematic diagram of the use of a pipetting device according to the present invention. [Figure 3D] FIG. 2 is a schematic diagram of the use of a pipetting device according to the present invention. [Figure 3E] FIG. 2 is a schematic diagram of the use of a pipetting device according to the present invention. [Figure 3F] FIG. 2 is a schematic diagram of the use of a pipetting device according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] FIG. 1 is a schematic diagram of an automated laboratory apparatus 10 in accordance with the present invention.

[0049] The automated laboratory apparatus 10 for processing a fluid sample 71 comprises a processing chamber 100 for receiving the fluid sample and a pipetting device 1 according to the present invention arranged in the processing chamber 100 for performing at least one processing step on the fluid sample 71.

[0050] The pipetting device 1 for processing a fluid sample 71 comprises a receiving element 11, a pipette tip 12 removably arranged on the receiving element 11, and a displacement element (which is integrated in the receiving element 11) flow-connected to the pipette tip 12 for generating a flow for receiving and / or discharging the fluid sample 71.

[0051] Furthermore, the pipetting device 1 has an optically transparent extension 13 that is detachably arranged on the pipette tip 12 such that the extension 13 is flow-connected to the displacement element via the pipette tip 12, such that a fluid sample 71 can be accepted into the extension 13 and / or expelled from the extension 13 by a flow that can be generated by the displacement element.

[0052] Additionally, the automated laboratory apparatus 10 comprises a moving device 4 arranged to be movable in at least one first spatial direction X of the processing chamber 100. The moving device 4 is connected to the pipetting device 1 such that the pipetting device 1 can be moved through the processing chamber 100 by the moving device 4. Furthermore, a detection device 5 is arranged in the processing chamber 100 for analyzing the fluid sample 71, as well as an electronic control device 3 in signal connection with the pipetting device 1, the moving device 4 and the detection device 5. Additionally, a container 7 having a plurality of wells 70 for receiving the fluid sample 71 is arranged in the processing chamber 100.

[0053] It is important that the extension 13 is optically transparent, as this is the only way in which analysis of the fluid sample 71 can be carried out in the detection device 5.

[0054] The steps for processing / analysing the fluid sample 71 are controlled by an electronic control device 3 which is signal-connected to the pipetting device 1, the moving device 4 and the detection device 5. Thus, it is predetermined by the electronic control device 3 that the fluid sample 71 is received by the extension 13 by activating the displacement mechanism and introduced together with the extension 13 to the detection device 5 for analysis, so that the fluid sample 71 can be analysed in the extension 13.

[0055] In operation, the control device 3 can therefore send control signals to the pipetting device 1, the moving device 4 and the detection device 5 in order to perform various process steps. Of course, the control device 3 can also receive signals from the pipetting device 1, the moving device 4 and the detection device 5. The signal connections are indicated by dashed lines.

[0056] The detection device 5 is controlled by the control device 3 such that an analysis of the fluid sample 71 takes place after the introduction of the extension 13. After analysis of the fluid sample 71, the measured data are transmitted from the detection device 5 to the control device 3 for evaluation.

[0057] FIG. 2 is a schematic diagram of a further embodiment of an automated laboratory apparatus 10 according to the invention, which has a structure equivalent to the automated laboratory apparatus 10 according to FIG.

[0058] However, the movement device 4 can in addition be moved in a second spatial direction Y of the processing chamber perpendicular to the first spatial direction X and in a third spatial direction Z of the processing chamber perpendicular to the first spatial direction X and to the second spatial direction Y, so that the detection device 5 can be flexibly moved to various wells 70 of a container 7 designed as a microtiter plate and thus to the detection device 5.

[0059] In the operating state, the pipetting device 1 can thus be moved in all spatial directions X, Y, Z through the processing chamber 100 by means of the moving device 4. In this way, in particular the attachment of the pipette tip 12 to the receiving element 11 and the attachment of the extension 13 to the pipette tip 12 (and also the detachment of the pipette tip 12 / extension 13, respectively) can be performed.

[0060] 3A-3F are schematic illustrations of the use of the pipetting device 1 according to the present invention.

[0061] The pipetting device 1 according to Figures 3A-3F comprises a receiving element 11 and a pipette tip 12 which is detachably arranged on the receiving element 11. A displacement element 14 for generating a flow for receiving and / or expelling a fluid sample 71 is integrated into the receiving element 11 and is thus flow-connected to the pipette tip 12. The displacement element 14 is designed as a displaceable piston and generates a flow in the form of an air-cushion displacement by moving along the dispensing axis A.

[0062] 3A and 3B, the extension 13 is attached to the pipette tip 12. For this purpose, the extension 13 has an attachment area 131 into which the pipette tip is inserted, whereby the extension 13 is received by the pipetting device 1 from the storage part 6.

[0063] In addition, the extension 13 has a measurement area 130 located in the attachment area 131, where the analysis of the fluid sample 71 is subsequently carried out.

[0064] For better analysis, the optically transparent extension 13 is made of an amorphous plastic, such as a cycloolefin copolymer, and the cross-sectional shape of the measurement area 130 perpendicular to the dispensing axis A is rectangular.

[0065] Following this, the pipetting device 1 of FIG. 3C is moved to a container 7 having a fluid sample 71 and receives the fluid sample 71 by moving the displacement mechanism 14 into the extension 13.

[0066] In FIG. 3D the extension 13 with the fluid sample 71 is moved to the detection device 5 and in FIG. 3E is introduced into the detection device 5 .

[0067] The detection device 5 comprises a radiation source 52 for irradiating the fluid sample 71 with primary radiation 81 and a detector 51 for receiving secondary radiation 82 arising from the fluid sample 71 .

[0068] Thus, the fluid sample 71 is irradiated with primary radiation 81 by the radiation source 52 and the detector receives secondary radiation 82 arising from the fluid sample 71 .

[0069] The radiation source 52 preferably generates the primary radiation 81 as electromagnetic radiation in the ultraviolet / visible range, in particular in the wavelength range of 190-1000 nm, in particular 365-720 nm. The secondary radiation 82 is in particular electromagnetic secondary radiation 82 arising from the fluid sample, which secondary radiation 82 is caused by the interaction of the primary radiation 81 with the fluid sample. The measurement principle used is an absorption measurement, whereby a light beam 82 (secondary radiation) attenuated by passing through the sample 71 and the extension 71 is captured by the detector 51.

[0070] In addition, liquid can be received into the pipette tip 12 and expelled from the pipette tip 12 before receiving the fluid sample 71 into the optically transparent extension 13, which can then be placed on the pipette tip 12. This liquid can thus be moved by the pipetting device 1 in the processing chamber 100, in particular between different containers / wells. Thereafter, in the method according to the invention, the extension 13 can then be placed on the pipette tip 12 and the fluid sample 71 can be received in the extension for analysis. This has the advantage that the fluid sample 71 can be analyzed without changing the pipette tip 12 (after using the pipette tip 12), simply by attaching the extension 13. Without changing the pipette tip 12, both contaminations are avoided and analysis of the fluid sample is possible.

Claims

1. A method for processing a fluid sample (71) using an automated laboratory device (10), comprising: a) providing an automated laboratory device (10), The laboratory equipment comprises: a processing chamber (100) for receiving said fluid sample (71); a pipetting device (1) arranged in said processing chamber (100) for performing at least one processing step on said fluid sample (71); a moving device (4) movably arranged in at least one first spatial direction (X) of said processing chamber (100), said moving device (4) being connected to said pipetting device (1) so that said pipetting device (1) can be moved through said processing chamber (100); a detection device (5) disposed within the processing chamber (100) for analyzing the fluid sample (71); an electronic control device (3) in signal connection with said pipetting device (1), said transfer device (4) and said detection device (5); having The pipetting device comprises: A receiving element (11) and a pipette tip (12) removably arranged on the receiving element (11); a displacement element (14) flow-connected to the pipette tip (12) for generating a flow for receiving and / or expelling the fluid sample (71); having the pipetting device (1) has an optically transparent extension (13) removably arranged on the pipette tip (12) such that the extension (13) is flow-connected to the displacement element (14) via the pipette tip (12), whereby the fluid sample (71) can be received into and / or expelled from the extension (13) by the flow which can be generated by the displacement element (14); the extension (13) having an attachment area (131) by means of which the extension (13) is placed on the pipette tip (12) and the attachment area (131) is placed on a dispensing area (120) of the pipette tip (12), and the fluid sample (71) can be received into and expelled from the pipetting device at the dispensing area (120); b) introducing said fluid sample (71) into said processing chamber (100); c) receiving and expelling liquid from the pipette tip (12) before placing the extension (13) on the pipette tip; d) receiving said fluid sample (71) into said optically transparent extension (13) by said pipetting device (1); e) moving the pipetting device (1) through the processing chamber (100) to the detection device (5) by the moving device (4); f) introducing the optically transparent extension (13) carrying the fluid sample (71) into the detection device (5); g) analyzing the fluid sample (71) by means of the detection device (5); The method according to claim 1,

2. 2. The method of claim 1, comprising the steps of irradiating the fluid sample (71) with primary radiation (81) by a radiation source (52) of the detection device (5) and receiving secondary radiation (82) arising from the fluid sample (71) by a detector (51) of the detection device (5).

3. The method of claim 2, further comprising determining a concentration of the fluid sample (71) based on the secondary radiation (82).

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