EP3902905A1 - Verfahren zum einstellen einer zellkonzentration und/oder einer partikelkonzentration in einer dispensiereinrichtung - Google Patents
Verfahren zum einstellen einer zellkonzentration und/oder einer partikelkonzentration in einer dispensiereinrichtungInfo
- Publication number
- EP3902905A1 EP3902905A1 EP19816766.0A EP19816766A EP3902905A1 EP 3902905 A1 EP3902905 A1 EP 3902905A1 EP 19816766 A EP19816766 A EP 19816766A EP 3902905 A1 EP3902905 A1 EP 3902905A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cell
- particle
- concentration
- dispensing device
- force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
- G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/0241—Drop counters; Drop formers
- B01L3/0268—Drop counters; Drop formers using pulse dispensing or spraying, eg. inkjet type, piezo actuated ejection of droplets from capillaries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/502761—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip specially adapted for handling suspended solids or molecules independently from the bulk fluid flow, e.g. for trapping or sorting beads or physically stretching molecules
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F13/00—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F13/00—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups
- G01F13/008—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups taps comprising counting- and recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1404—Handling flow, e.g. hydrodynamic focusing
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/14—Process control and prevention of errors
- B01L2200/143—Quality control, feedback systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/0433—Moving fluids with specific forces or mechanical means specific forces vibrational forces
- B01L2400/0436—Moving fluids with specific forces or mechanical means specific forces vibrational forces acoustic forces, e.g. surface acoustic waves [SAW]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/149—Optical investigation techniques, e.g. flow cytometry specially adapted for sorting particles, e.g. by their size or optical properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1404—Handling flow, e.g. hydrodynamic focusing
- G01N2015/1406—Control of droplet point
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1404—Handling flow, e.g. hydrodynamic focusing
- G01N2015/142—Acoustic or ultrasonic focussing
Definitions
- the invention relates ⁇ to a method for the indentation of a cell concentration and / or a particle concentration in a dispensing device.
- the invention relates to a dispensing device with a dispensing device.
- a large number of devices are known from the prior art, by means of which a liquid, in particular a liquid drop containing a cell, can be dispensed.
- Devices are known in which the liquid is dispensed using free jet printing methods.
- a distinction is made between devices in which the liquid is dispensed according to a drop-on-demand mode of operation or a continuous jet mode of operation.
- the drop-on-demand mode of operation individual liquid drops are generated in a targeted manner from a liquid delivery device of the device at a selected point in time. This means that individual liquid drops are generated on command using a separate drive signal.
- a thin liquid jet is emitted from the liquid dispenser in a pressure-driven manner, the liquid jet disintegrating into individual liquid drops after dispensing from the liquid dispenser, which drops can be electrostatically deflected ⁇ .
- a separate control signal is therefore not provided for each individual liquid drop and the individual liquid drops cannot be generated in a targeted manner at a selected point in time.
- the problem often arises that the cell concentration in the liquid is too high, so that liquid drops which are unusable for further processing are output with more than one cell.
- the problem can arise that the cell concentration in the liquid is too low. In this case, a plurality of liquid drops that have no cells are sequentially dispensed, so the method for dispensing the liquid drops is not efficient.
- the object of the invention is to provide an improved method.
- the object is achieved by a method for setting a cell concentration and / or a particle concentration in a dispensing device, by means of which a liquid sample can be dispensed, the cell concentration and / or particle concentration being determined and the cell concentration and / or particle concentration determined being compared with a desired value and depending on a result of the comparison, a force exerted on a cell and / or a particle is set.
- Another object of the invention is to provide an improved dispensing device.
- the object is achieved by a dispensing device which carries out a method according to the invention ⁇ .
- a dispensing device with a dispensing device, a sound transmitter, an actuating means for actuating the dispensing device, a control device and an evaluation device for determining a cell concentration and / or particle concentration in the dispensing device, the control device for setting a cell concentration and / or particle concentration in the dispensing device, depending on a result of a comparison of the determined cell concentration and / or particle concentration with a desired value, sets a force exerted on a cell and / or a particle ⁇ .
- the solution according to the invention has the advantage that the cell concentration and / or the particle concentration can be actively adjusted. This can easily prevent a liquid sample that is unusable for further analysis from being dispensed or analyzed. As a result, an efficient process can be realized.
- the dispensing device is used to dispense at least one liquid sample.
- the liquid sample dispensed by means of the dispensing device can be a liquid droplet, in particular a free-flying liquid.
- the dispensed liquid sample can be a jet of liquid which, after dispensing from a dispenser of the dispensing device, may disintegrate into individual liquid drops.
- the dispensing device can be a drop generator.
- the liquid drop can have a volume in a range between 1 pl (picoliter) to 50 nl (nanoliter).
- the liquid sample can be a liquid and can have at least one cell and / or at least one particle.
- the dispensed liquid sample, in particular the liquid drop or the liquid jet can have no cell and / or no particle.
- the dispensed liquid sample, in particular the liquid drop or the liquid jet can have a single cell and / or a single particle.
- the dispensed liquid sample, in particular the liquid drop or the liquid jet can alternatively have more than a single cell and / or more than a single particle.
- the liquid of the liquid sample can have a composition that is conducive to cell growth.
- the particle can be a glass or polymer bead and have substantially the same volume as the cell.
- the cell is a biological cell, in particular the cell is the smallest unit of life that is autonomously capable of reproduction and self-preservation.
- the force can be part of a, in particular multidimensional, force field.
- the force field ensures that a force acts on the cells and / or particles of the liquid sample.
- the force can be set in such a way that the cell and / or the particle is arranged in one direction and is accelerated or slowed down in an output direction or is held essentially stationary, in particular stationary. When the cell slows down, the cell moves more slowly than it would move, for example due to the weight and / or a dispensing process, the flow force exerted on it.
- the force can be caused by sound.
- the liquid sample in particular the cells and / or particles, is subjected to a sound field. This can result in a standing sound field or a resonance.
- the force can alternatively or additionally be generated by electromagnetism and / or electrostratics and / or hydrodynamics and / or optofluidics. Alternatively, the force can also be generated by a combination of the aforementioned options.
- the cells and / or particles can be arranged and / or moved and / or held in the dispensing device by the sound field. This is possible because when a sound field occurs, in particular a standing sound field, a force is exerted on the cell and / or the particle. This force is referred to as acoustic radiance or acoustic radiation.
- the force or the force field exerted on the cell and / or the particle can prevent cells and / or particles from being dispensed together with the liquid from the dispensing device, in particular a section of the dispensing device. After the liquid sample has been dispensed, new liquid and possibly cells and / or particles flow into the section of the dispensing device. As a result, the cell concentration and / or particle concentration in the section of the dispensing device can be set in a simple manner.
- the sound field can be generated by a sound generator.
- the sound generator is designed in such a way that it can generate a sound field with a specific frequency.
- the force can preferably by adjusting an alignment and / or a frequency and / or an amplitude and / or a phase and / or a modulation of the sound.
- the sound generator can be designed such that it can generate sound fields with different frequencies and / or amplitudes and / or phases and / or modulations and / or orientations, in particular with a time offset.
- the sound generator can be formed by a piezo transducer.
- the setpoint can be a predefined or predeterminable value.
- the setpoint can be entered by the user or determined automatically.
- the setpoint can be stored in an electrical memory ⁇ .
- the setpoint can have a value in the range of 100 cells per milliliter to 10 8 cells per milliliter.
- the result of the comparison can be that the cell concentration and / or particle concentration is less than or equal to or greater than the target value.
- the procedure can be carried out automatically. This means ⁇ that the method automatically adjusts the cell concentration and / or particle concentration without user intervention ⁇ .
- the cell and / or particle concentration can be determined by determining the number of cells and / or particles per volume or the number of cells or a volume ratio between the cell volume and the sample volume.
- a person ⁇ can be determined from which the concentration can be deduced. Such a who ⁇ can result, for example, from the analysis of the generated image. This can be based on parameters such as contrast ⁇ , brightness, morphology, color, pattern or the like.
- the firing of the dispensing device can be changed to dispense part of the liquid sample in order to reduce the cell and / or particle concentration.
- a point in time and / or the frequency of activation and / or frequency of activation and / or the form of activation and / or amplitude of activation and / or a volume of the dispensed liquid sample can be changed.
- the force can be set such that the cell and / or the particle is held essentially stationary, in particular stationary, and the liquid sample is dispensed by means of the dispensing device if the determined cell concentration and / or particle concentration is less than the setpoint.
- the liquid sample is output and the force field is set such that the cells and / or the particles are held essentially stationary, in particular stationary.
- the dispensing device can be subjected to the sound field and the liquid sample can be dispensed by means of the dispensing device if the cell concentration and / or particle concentration determined is less than the target value.
- At least one dispensing process can be carried out in which the liquid sample, the liquid and no cell and / or no particle ⁇ is dispensed.
- several dispensing processes can be carried out, each of which dispenses a liquid sample that has the liquid and no or few cells and / or particles ⁇ . As a result, a high volume of liquid is dispensed very quickly.
- dispensing a liquid sample from the dispensing device causes an afterflow of liquid sample within the dispensing device.
- the liquid sample located in the dispensing device in particular in a fluid chamber of the dispensing device, flows into an output channel of the dispensing device.
- the cell concentration and / or particle concentration can easily be increased quickly because the liquid sample supplied is likely to have cells and / or particles ⁇ .
- the cell concentration and / or particle concentration can be increased because in at least one node or node area of the sound field or minimum of the time-average pressure, cells and / or particles are moved, arranged, concentrated or held locally and are therefore not dispensed during the dispensing process.
- no force can be exerted on the cell and / or the particle or the force can be set such that the cell and / or the particle can be moved in the dispensing direction if the cell concentration and / or particle concentration determined is equal to the desired value .
- no force field can be exerted on the cells and / or particles, or a force field can be set in such a way that the cells and / or particles can be moved in the dispensing direction.
- no force means that no external force which results from the possibilities described above, such as acoustophoresis, is exerted on the cell and / or the particle.
- This external force acts in addition to the forces that always act on the cell and / or the particle, such as the weight force.
- the dispensing device is not subjected to a sound field.
- the liquid Sample which at least one, in particular exactly one, cell and / or at least one, in particular exactly one, particle ⁇ are output without the dispensing device being exposed to the sound field.
- a liquid sample can be output.
- a large amount of liquid can be dispensed in a simple manner in a short time and the cell and / or particle concentration can thus be reduced.
- a large amount of liquid can preferably be dispensed by dispensing the liquid sample for a predetermined period of time.
- the liquid sample can be dispensed continuously during the specified time period or several dispensing processes can be carried out during the specified time period.
- a predetermined number of dispensing processes can be carried out. It is possible that no force or force field is exerted on the cells and / or particles. In particular, the cells and / or particles cannot be exposed to any sound field.
- a force can alternately be exerted on the cell and / or the particle which is set such that it holds the cell and / or the particle essentially stationary, in particular stationary, and no force can be exerted.
- the cells and / or particles can alternately be acted upon with a force field and no force field. This can be achieved by switching the sound field on or off for a specified period of time.
- the sound generator can be switched off ⁇ and after dispensing the liquid sample, the dispensing device can be acted upon again ⁇ with the sound field ⁇ . To dispense the next liquid sample, the sounder can be switched off again.
- the sounder can be switched on and the sounder switched off before the liquid sample is dispensed, several times in succession within a predetermined or predeterminable time period. Because the sound field is temporarily switched off, the cells and / or particles can be transported further in the period. This means that only a desired number or concentration of cells and / or particles can be transported.
- an advantage of this mode of operation is that the number of liquid samples which have more than one cell and / or particles can be reduced. This is particularly advantageous because the liquid samples, which have a single sample and / or single cell, are particularly advantageous for the analysis of the liquid samples that are output.
- the dispensing device can be subjected to the sound field again if the cell concentration and / or particle concentration is still greater than the desired value.
- the liquid sample dispensed can have or have at least one, in particular exactly one, cell and / or at least one, in particular exactly one, particle in addition to the liquid.
- a force can be exerted on the cell and / or the particle which is set in such a way that it counteracts a movement of the cell and / or the particle, but enables a movement of the cell and / or the particle ⁇ is.
- a force field can be exerted on the cells and / or particles that is opposite to a movement of the cells and / or particles.
- a force is exerted on the cell and / or the particle, which is a movement of the cell and / or the particle in comparison to an operation in which the cell and / or the particle is due to the weight ⁇ and / or due to the force exerted on the cell during a dispensing process, such as a flow force ⁇ , move ⁇ , slow down ⁇ .
- the sound generator can preferably be operated alternately between a state in which the force exerted on the cell and / or the particle is set such that the cell and / or the particle is essentially stationary, in particular stationary, and another state, where the force applied to the cell and / or the particle, as described above, slows the movement of the cell and / or the particle ⁇ .
- the liquid sample dispensed can also have at least one, in particular exactly one, cell and / or in addition to the liquid have at least one, in particular exactly one, particle.
- the sounder can be operated alternately for a predetermined period of time and / or with a predetermined number of dispensing processes.
- One drop of liquid pinch can be dispensed during each dispensing process.
- the dispensing device can be applied again to the sound field if the cell concentration and / or particle concentration is still greater than the target value.
- a two- or three-dimensional force field in particular a sound field
- This force field in particular sound field
- the force field in particular sound field, can additionally be selected, in particular adjusted, in such a way that the cells are transported further in the application direction.
- the force field in particular sound field, can be selected, in particular in addition to the central focusing, in such a way that the cells transport only slowly, in particular not, further in the application direction ⁇ become.
- the force field in particular sound field
- the force field can be selected, in particular adjusted, in such a way that the cells continue to move only slowly, in particular not further are transported and further cells and / or particles flow into the output channel by repeated dispensing of drops, thus increasing the concentration.
- the force field in particular sound field, can be selected, in particular in addition to the central focusing, in such a way that the cells in the dispensing direction are slow, especially not further be transported ⁇ and by dispensing drops of a certain volume range within a certain dosing frequency range a suitable amount Cells and / or particles are transported further.
- a method and / or a dispensing device is particularly advantageous in which it is possible to carry out the above-mentioned operating modes depending on the result of the comparison.
- the control device can control the sound generator in such a way that the dispensing device is acted upon by the sound field or not.
- the control device can control the sound generator in such a way that the type of sound field can be selected, in particular adjusted.
- the control device can adapt the dispensing process.
- the control device can control the actuating means in such a way that the liquid sample is dispensed from the dispensing device.
- the dispensing device can have an output channel through which the liquid sample can be output.
- the output channel can be considered.
- the entire output channel or a part of the output channel containing an output opening can be viewed.
- the determination of the cell concentration and / or particle concentration in the at least part of the output channel offers the advantage that it can be predicted whether the liquid sample to be dispensed in the next step, in particular the liquid drop to be dispensed, or the liquid samples to be dispensed in the next steps, in particular the liquid drop to be dispensed, contains a certain number of cells and / or particles. In particular, it can be predicted whether the drop of liquid to be dispensed or the drop of liquid to be dispensed will contain no or a single or more cells and / or no or a single or more particles. This knowledge enables the dispensing processes to be carried out very efficiently.
- the liquid sample contained in the at least part of the dispensing channel can be dispensed directly during a next dispensing process.
- the liquid sample contained in the at least part of the dispensing channel can only be dispensed after a predetermined number of dispensing processes.
- the liquid sample can be dispensed on a drop-on-demand basis.
- the dispensing device provides a discrete and not a continuous dispensing of the liquid sample.
- the dispensing device can have an actuating means, which can be, for example, a piezoelectrically operated actuator.
- the Dispensing device have a section, in particular a mechanical membrane, which can be actuated by the actuating means.
- the actuating means When the actuating means is actuated, a volume of the dispensing channel is reduced and the liquid sample, in particular a drop of liquid, is expelled from the dispensing device.
- the cells and / or particles located in the discharge channel can be moved stepwise along a discharge direction of the liquid sample in the drop-on-demand mode of operation.
- the number of cells and / or particles in at least part of the output channel, in particular in the entire output channel, preferably in a nozzle-shaped end region of the output channel, can be determined.
- the cell concentration and / or particle concentration in at least part of the output channel or the entire output channel can be determined in a simple manner.
- the particle and / or cell concentration or the particle and / or cell number can be determined after a part of the liquid samples has been ejected. For example, the number of drops and the particles and / or cells contained therein can be determined. This can be done with the help of at least one image. This mapping can take place, for example, of the liquid sample in flight or after the liquid sample has hit a surface. An image of a partial area of a container into which the at least one drop has been placed can also be created.
- an image of the at least part of the output channel can alternatively or additionally be generated.
- an image of the entire output channel can be generated.
- the dispensing device can have an optical detection device which has an imaging device ⁇ .
- the imaging device is used to generate at least one image of the at least part of the output channel or of the entire output channel.
- the evaluation device can determine the number of cells and / or particles located in the at least part of the output channel, in particular in the entire output channel.
- the cell concentration and / or particle concentration can be determined by determining how many liquid drops are emitted, the respectively no cell and / or no particle or the one cell and / or a single particle or several cells and / or have multiple particles.
- the control device can set the cell concentration and / or particle concentration to the desired value or regulate to a who ⁇ in a target range.
- the cell concentration and / or the particle concentration in the dispensing device, in particular in the output channel can be applied to the at least part of the output channel, in particular the entire output channel, with a sound field, in particular a two- or three-dimensional standing sound field, ⁇ become.
- the sound field can be configured such that at least one cell and / or at least one particle is held essentially stationary, in particular stationary, in at least one direction.
- the cell and / or the particle are located in the output channel or part of the output channel affected by the sound field.
- the sound field can be configured such that the cell and / or the particle is held or braked in a direction opposite to an application direction of the liquid. After a dispensing process, cells that are arranged in another part of the output channel can get into the part of the output channel.
- the sound field is configured such that it is avoided that when the liquid sample is dispensed by the dispensing device, the cell and / or the particle is dispensed together with the liquid.
- acoustophoretic focusing or concentration of the cells and / or particles in the at least part of the output channel, in particular in the entire output channel is achieved by the sound generator and the output sound field.
- the fluid chamber can serve to hold the liquid sample.
- the user of the dispensing device can enter the liquid sample into the fluid chamber.
- the fluid chamber is fluidly connected to the output channel. A fluidic connection exists between two components if the liquid can flow from one component to the other component.
- the frequency, orientation, amplitude and / or phase of the sound field emitted by the sound generator can be selected such that a wall distance of the dispensing device along the direction of discharge of the liquid corresponds to half the wavelength of the sound wave in the liquid or an integral multiple of half the wavelength.
- a wall distance of the dispensing device along the direction of discharge of the liquid corresponds to half the wavelength of the sound wave in the liquid or an integral multiple of half the wavelength.
- the fluid chamber and / or the at least part of the output channel can be subjected to a plurality of sound fields, in particular staggered in time.
- the sound fields can differ from one another in their frequency, amplitude, phase, modulation and / or alignment.
- the fluid chamber can be loaded with, in particular a plurality of, time-staggered sound fields of different frequencies if the cell concentration and / or the particle concentration is less than or greater than or equal to or similar to or like the target value.
- the cells and / or particles located within the at least part of the output channel are repositioned.
- the repositioning of the cells and / or particles within the at least part of the delivery channel reduces the risk that a liquid is released which contains more than one row and / or more than one particle.
- the result is that the liquid in the fluid chamber is mixed.
- This is advantageous because it increases the probability that after a liquid has been dispensed, a liquid sample from the fluid chamber flows into the dispensing channel ⁇ , which has at least one cell and / or at least one particle ⁇ .
- Another advantage of loading the fluid chamber and / or the output channel with sound fields of different frequency, amplitude, phase, modulation and / or orientation is that clusters, that is to say a plurality of cells and / or particles connected to one another, can be dissolved.
- the output channel can have at least one section which have a flow cross-section that changes along a discharge direction of the liquid ⁇ .
- the discharge channel can have a nozzle at its end remote from the fluid chamber.
- the variable flow cross-section ensures that the flow paths of the individual cells and / or particles differ from one another.
- a line that flows along a central axis of the output channel may have a shorter flow path than, for example, a cell that flows in the vicinity of an output channel wall and is deflected by the output channel wall. In this way, it can easily be avoided that a liquid sample, in particular the liquid drop, is output with more than one cell and / or one particle.
- the dispensing device can have a deflection and / or suction device.
- the deflection device serves to deflect the dispensed liquid sample, in particular the dispensed liquid drop.
- the suction device is used to suck off the liquid sample that is dispensed, in particular the liquid drop that is dispensed.
- the deflection process and / or the suction process can depend on the cell concentration and / or particle concentration determined.
- the liquid sample dispensed can be deflected ⁇ and / or sucked into a reject container. Alternatively, the dispensed liquid sample can be fed into a container, in particular a container of the microtiter plate.
- the deflection and / or suction can take place before the liquid sample that is dispensed enters the container, in particular the container of the microtiter plate.
- the dispensed liquid sample can be deflected and / or aspirated if the liquid sample contains no cells and / or no particles.
- the dispensed liquid sample can be deflected and / or aspirated if the number of cells and / or particles contained in the liquid sample is greater than a predetermined value, in particular greater than 1.
- the dispensing device can have a displacement device.
- the dispensing device and / or the container and / or the reject container can be moved by means of the displacement device.
- the process can depend on the determined cell concentration and / or particle concentration and / or a dosing process.
- the liquid sample can be fed into the reject container if there is no cell and / or no predetermined number of cells and / or particles in the liquid sample being dispensed.
- the dispensed liquid sample can be fed into the container if a single cell and / or a single particle is arranged in the liquid sample.
- the dispensed liquid sample is not a cell, a single cell or several cells and / or no particle , a single particle or several Particles ⁇ .
- the dispensing device can again be detachably connected to the remaining components of the dispensing device, in particular mechanically. This allows the dispensing device to be easily replaced.
- a data carrier on which the computer program according to the invention is stored is also advantageous.
- a data carrier signal that transmits a computer program according to the invention is advantageous.
- FIG. 1 shows a dispensing device according to the invention
- FIG. 2 shows a dispensing device of the dispensing device in a state in which the dispensing device is not subjected to a sound field
- FIG. 3 shows the dispensing device in a state in which the dispensing device is exposed to a sound field
- FIG. 4 shows the dispensing device in a state in which the dispensing device is exposed to a sound field and a liquid sample is dispensed from the dispensing device
- FIG. 5 shows the dispensing device in a state in which the cell concentration in part of the output channel is too high
- FIG. 6 shows the dispensing device in a state in which liquid samples are dispensed from the dispensing device
- FIG. 7 shows the dispensing device in a state in which the cells in the output channel are concentrated in the middle and the cell concentration is too low
- FIG. 8 shows the dispensing device from FIG. 7 in a state in which a plurality of liquid drops are dispensed
- FIG. 9 shows the dispensing device in a state in which the cells in the dispensing channel are concentrated in the center and liquid samples are dispensed
- Figure 10 shows the dispensing device in a state in which the cells in the dispensing channel are aligned ⁇ and liquid samples are dispensed.
- FIG. 1 shows a dispensing device 6 according to the invention, which has a dispensing device 1 for dispensing a liquid sample 20, which can have liquid 2 and at least one cell 4 and / or at least one particle.
- the dispensing device 6 has an optical detection device 10 for optically detecting at least a part of an output channel 3 of the dispensing device 1.
- the dispensing device 1 can have a fluid chamber 5, in which liquid 2 and cells 4 and / or particles are contained.
- the fluid chamber 5 is fluidly connected to the discharge channel 3.
- the optical detection device 10 has an imaging device 11 for generating an image of the at least part of the output channel 3 and further elements not shown in the figures. To generate an image, the at least part of the output channel 3 is illuminated ⁇ by means of an illuminating light 17 and a detection light ⁇ 16 then emanating from the at least part of the output channel 3 is detected by the optical detection device 10. The imaging device 1 1 generates an image of the at least part of the output channel 3 based on the detected detection signal 16.
- the optical detection device 10 is electrically connected to an evaluation device 12.
- the evaluation device 12 can determine the number of cells 4 and / or particles contained in the at least part of the output channel 3 based on the generated image. The evaluation device 12 can thus determine the cell concentration and / or particle concentration in the at least part of the output channel 3.
- the evaluation device 12 is electrically connected to a control device 9.
- the control device 9 and the evaluation device 12 can be part of a computer.
- the control device 9 controls the dispensing process of the dispensing device 1 based on the evaluation result of the evaluation device 12.
- the control device 9 is electrically connected to a moving device 13.
- the traversing device 13 can move the dispensing device 1 and / or a container 14 and / or a reject container 15 in such a way that the liquid 2 can be dispensed into the desired storage location.
- control device 9 can control a deflection and / or suction device 18 of the dispensing device 6.
- the control device 9 can deflect and / or Control the suction device 18 such that the dispensed liquid sample 20 is deflected ⁇ and / or suctioned ⁇ if the liquid sample 20 has no cell 4 and / or no particle ⁇ or if the liquid sample 20 has several cells 3 and / or several particles ⁇ .
- the control device 9 can use the cell concentration and / or particle concentration determined by the evaluation device 12 to predict whether the liquid drop to be dispensed during the next dispensing process and / or the liquid drop to be dispensed has no or only one or more cells and / or particles ⁇ .
- the control device 9 can control the displacement device 13 and / or the deflection and / or suction device 18 depending on the prediction.
- FIG. 1 shows a state in which the dispensing device 1 has dispensed a liquid sample 20, in particular a drop of liquid, which has a single cell 4 ⁇ .
- the liquid 2 is fed together with the cell 4 into the container 14, which, for example, is part of a micro ⁇ i ⁇ erpla ⁇ ⁇ not shown, ⁇ .
- the dispensing device 6 has an actuating means 8 which is pressed against a section of the dispensing device 1 in order to actuate the dispensing device 1.
- the liquid sample 20, in particular a drop of liquid, is dispensed when the actuating means 8 presses against the section of the dispensing device 1 ⁇ .
- the actuating means 8 and the optical detection device 10 face each other with respect to the dispensing device 1.
- the dispensing device 1 consists at least partially of a transparent material, so that at least a part of the output channel 3 can be detected by means of the optical detection device 10.
- the dispensing device 1 also has a sound generator 7 which emits a sound field.
- the sound generator 7 is positioned such that at least a part of the output channel 3, in particular the entire output channel 3, can be acted upon by the sound field.
- the sound generator 7 can be mechanically in contact with the actuating means 8 and can thus transmit the sound particularly efficiently.
- FIG. 2 shows the dispensing device 1 of the dispensing device 6 in a state in which the dispensing device 1 is not subjected to a sound field.
- ⁇ Figure 2 shows an enlarged view of the dispensing device 1 from the front.
- the discharge channel 3 is completely filled with the liquid sample 20. Only the part of the output channel 3 shown in dashed lines in FIG. 2, which has an output opening of the output channel 3 ⁇ , is considered ⁇ using the optical detection device 10. In the part of the output channel 3 under consideration, three cells 4 of the liquid sample 20 are arranged ⁇ . At In a dispensing process, the liquid sample 20 is dispensed along an application direction R.
- the discharge channel 3 has a nozzle-shaped end at its end remote from the fluid chamber 5. In addition, the discharge channel 3 has a nozzle-shaped end at its end facing the fluid chamber 5.
- the cells 4 arranged in the dispensing channel 3 move due to the weight force in the direction of the dispensing opening of the dispensing channel 3, even if no liquid 2 is dispensed from the dispensing device 1.
- FIG. 3 shows ⁇ the dispensing device 1 in a state in which the dispensing device 1 is subjected to a sound field ⁇ .
- the part of the output channel 3 which is represented by the broken line is subjected to the sound field ⁇ .
- a force acts on the cells 4 that is opposite to the discharge direction R.
- the cells 4 do not move or move less towards the nozzle-shaped end due to the weight force. Due to the force exerted on them in the direction of discharge, the cells 4 can be kept slow ⁇ or essentially stationary, in particular stationary.
- the cells 4 are aligned by the sound field in a direction transverse, in particular perpendicular, to the application direction R.
- one or more multidimensional ones can be superimposed by superimposing one or more sound waves emanating from the sound generator 7 and one or more sound waves reflected on one or more output channel walls 19 If several standing waves are generated and it is thus achieved that the cells 4 are held essentially stationary, in particular stationary.
- the standing waves run parallel to the discharge direction R and run between the upper end of the dispensing device 1 facing the fluid chamber 5 and the lower end of the dispensing device 1 facing away from the fluid chamber 5.
- a first operating mode of the dispensing device 6 according to the invention is described below with reference to FIGS. 1 to 4.
- the imaging device 11 produces an image of the output channel 3, in particular the part of the output channel 3 shown in dashed lines in FIG. 2.
- the ejection device 12 determines the number of cells 4 contained in the dashed part of the output channel 3 based on the generated image and thus determines the cell concentration in the considered part of the output channel 3.
- the control device 9 checks whether the cell concentration is less than a predetermined target value. In the case shown in FIGS. 1-4, it is assumed that the cell concentration in the part of the output channel 3 under consideration is too low, that is to say it is smaller than the target value.
- the sound generator 7 is activated and the output channel 3, in particular the part of the output duct 3 shown in dashed lines, is acted upon by a sound field generated by the sound generator 7.
- the sound field is configured in such a way that a force is exerted on the cells 4, which prevents the cells 4 from moving in the direction of the nozzle-shaped end of the output channel 3 facing away from the fluid chamber 5.
- liquid dispensing means that part of the liquid in the fluid chamber 5 flows into the dispensing channel 3 via the upper end of the dispensing device 1. Since the liquid 2 in the fluid chamber 5 contains cells 4, new cells 4 thus get into the part of the output channel 3 in question. Specifically, in the embodiment shown in FIG.
- a second operating mode of the dispensing device 6 according to the invention is explained below with reference to FIGS. 1, 5 and 6.
- the cell concentration in the part of the output channel 3 shown in dashed lines in FIG. 5 is determined.
- the control device 9 determines that the cell concentration is greater than the target value.
- the sounder 7 is switched off ⁇ and the actuating means 8 is actuated, so that a dispensing process is carried out.
- the sound generator 7 is switched on again, the part of the dispensing channel 3 under consideration having the Sound field is applied ⁇ .
- the shuttering in of the sounder and the shuttering out of the sounder before dispensing the liquid sample 20 are repeated several times within a predetermined period of time and / or with a predetermined number of dispensing processes ⁇ .
- the sound generator 7 is set in the switched-on state in such a way that the force exerted on the cells causes the cells to be held essentially stationary, in particular stationary.
- the sound generator 7 is then not switched off ⁇ , but transferred to another state ⁇ , in which the force acting on the cells is smaller than the flow force acting on the cells during the dispensing process.
- a dispensing process is carried out when the sound generator 7 is in the other state.
- the force acting on the cells in the other state of the sound generator can be greater than the weight force acting on the cells, but smaller than the flow force acting on the cells during the dispensing process. As a result, the movement of the cells in the direction of the dispensing opening is slowed down.
- the sounder 7 is operated, as can be seen from FIG. 6, it is achieved that a large number of dispensed liquid samples 20 have only a single cell 4.
- the cell concentration and / or particle concentration is checked again.
- the sounder is switched on again when the cell concentration is greater than the setpoint.
- the aforementioned steps are repeated several times until the cell concentration is equal to the target value or is less than the target value.
- FIGS. 7 to 10 show a third mode of operation of the dispensing device according to the invention.
- the modes of operation described in FIGS. 7 to 10 have in common that a sound field is used to concentrate or align the cells 4 located in the output channel 3 in the output channel 3.
- the cell and / or particle concentration is set.
- the cell and / or particle concentration can be adjusted by applying a different sound field to the corresponding area of the output channel 3.
- the cell and particle concentration can be adjusted by changing the setting of the sound field, such as the frequency, amplitude, etc., of the sound field, which is the concentration or orientation of the Cells cause ⁇ .
- the output channel does not have to be exposed to several sound fields, but the concentration or alignment can be effected with the same sound field and the cell and particle concentration can be adjusted.
- FIGS. 7 and 8 show a state in which the cells are concentrated ⁇ in a central part of the output channel 3.
- the concentration of the cells in the central region of the output channel 3 is achieved ⁇ by the output channel 3 being subjected to a sound field ⁇ .
- the sound field is adjusted in such a way that a force acts on the cells, which leads to the concentration shown in FIG. 7 in the central region of the output channel 3.
- the cell concentration in the area under consideration of the output channel 3, which is not shown in FIGS. 7 and 8, is smaller than the target value.
- the sound field is therefore set such that the cells 4 arranged in the area under consideration of the output channel 3 do not move in the direction of discharge R.
- the sound field is set in such a way that the cells 4 arranged within the output channel 3 do not move even after a plurality of liquid drops shown in FIG. 8 have been output and are therefore essentially stationary.
- the cells 4 are concentrated ⁇ due to the applied sound field in the middle of the output channel 3. Even if this is not shown in FIG. 9, the cell concentration was too high in the part of the output channel 3, which is not shown, and was therefore above the target value.
- the sound generator is alternately switched on and off ⁇ or set (e.g. by reducing the force on the cells) in such a way that only a part of the cells are fed to the area under consideration, so that the cell concentration in the area under consideration is reduced and the probability is increased that the liquid samples 20 dispensed each have a single cell 4.
- the cells 4 are aligned ⁇ due to the adjacent sound field.
- the cell concentration in the part of the output channel 3, not shown, is equal to the setpoint. In this case, the sound field does not have to go any further be adjusted ⁇ in order to obtain a change in the cell concentration in the considered part of the output channel 3.
- an image of the output channel 3, in particular of the part of the output channel 3, is generated and the number of cells 4 and / or particles arranged in the output channel 3 is determined.
- the part of the output channel 3 under consideration is acted upon with the sound field ⁇ or is not acted upon with the sound field ⁇ .
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- General Physics & Mathematics (AREA)
- Dispersion Chemistry (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Automation & Control Theory (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU101086A LU101086B1 (de) | 2018-12-27 | 2018-12-27 | Verfahren zum Einstellen einer Zellkonzentration und/oder Partikelkonzentration in einer Dispensiereinrichtung |
| PCT/EP2019/084880 WO2020136018A1 (de) | 2018-12-27 | 2019-12-12 | Verfahren zum einstellen einer zellkonzentration und/oder einer partikelkonzentration in einer dispensiereinrichtung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3902905A1 true EP3902905A1 (de) | 2021-11-03 |
Family
ID=65529762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19816766.0A Withdrawn EP3902905A1 (de) | 2018-12-27 | 2019-12-12 | Verfahren zum einstellen einer zellkonzentration und/oder einer partikelkonzentration in einer dispensiereinrichtung |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20220055027A1 (de) |
| EP (1) | EP3902905A1 (de) |
| AU (1) | AU2019412713A1 (de) |
| CA (1) | CA3124894A1 (de) |
| LU (1) | LU101086B1 (de) |
| WO (1) | WO2020136018A1 (de) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8263407B2 (en) * | 2007-10-24 | 2012-09-11 | Los Alamos National Security, Llc | Method for non-contact particle manipulation and control of particle spacing along an axis |
| DE102015202574A1 (de) * | 2015-02-12 | 2016-08-18 | Albert-Ludwigs-Universität Freiburg | Vorrichtung und Verfahren zum Dispensieren von unter Verwendung eines akustischen Felds ausgerichteten Partikeln in frei fliegenden Tropfen |
-
2018
- 2018-12-27 LU LU101086A patent/LU101086B1/de active IP Right Grant
-
2019
- 2019-12-12 CA CA3124894A patent/CA3124894A1/en not_active Abandoned
- 2019-12-12 US US17/417,444 patent/US20220055027A1/en not_active Abandoned
- 2019-12-12 EP EP19816766.0A patent/EP3902905A1/de not_active Withdrawn
- 2019-12-12 WO PCT/EP2019/084880 patent/WO2020136018A1/de not_active Ceased
- 2019-12-12 AU AU2019412713A patent/AU2019412713A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU2019412713A1 (en) | 2021-07-22 |
| US20220055027A1 (en) | 2022-02-24 |
| WO2020136018A1 (de) | 2020-07-02 |
| CA3124894A1 (en) | 2020-07-02 |
| LU101086B1 (de) | 2020-07-03 |
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