EP1623206A1 - Injecteur de particules destine a un separateur de cellules - Google Patents

Injecteur de particules destine a un separateur de cellules

Info

Publication number
EP1623206A1
EP1623206A1 EP04731920A EP04731920A EP1623206A1 EP 1623206 A1 EP1623206 A1 EP 1623206A1 EP 04731920 A EP04731920 A EP 04731920A EP 04731920 A EP04731920 A EP 04731920A EP 1623206 A1 EP1623206 A1 EP 1623206A1
Authority
EP
European Patent Office
Prior art keywords
particle injector
carrier flow
carrier
flow channel
particle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04731920A
Other languages
German (de)
English (en)
Inventor
Torsten Müller
Stefan Hummel
Annette Pfennig
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.)
PerkinElmer Cellular Technologies Germany GmbH
Original Assignee
Evotec Technologies GmbH
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 Evotec Technologies GmbH filed Critical Evotec Technologies GmbH
Publication of EP1623206A1 publication Critical patent/EP1623206A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • 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
    • 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
    • G01N15/1409—Handling samples, e.g. injecting samples
    • 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
    • G01N2015/1413—Hydrodynamic focussing
    • 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
    • G01N2015/1418—Eliminating clogging of debris

Definitions

  • the invention relates to a particle injector for introducing particles into a carrier stream of a microfluidic system, in particular for injecting biological cells into the carrier stream of a cell sorter, according to the preamble of claim 1.
  • a cell sorter is known from US Pat. No. 5,989,505 which makes it possible; separating biological cells in a carrier stream dielectrophoretically / the dielectrophoretic effects used for the separation being described, for example, in MÜLLER, ⁇ . et al ,; "A 3-D microelectrode system for handling and caging single cells and particles", Biosensors & Bioelectronics 14 (1999) 247-256.
  • the biological cells to be sorted are injected into the carrier flow by a particle injector, the carrier flow entering the particle injector via an inlet and leaving it again together with the injected biological cells via an outlet.
  • the actual injection of the biological ropes to be sorted takes place through an injection needle which is pierced through a septum in the particle injector and is introduced coaxially into the carrier flow between the inlet and the outlet of the particle injector, so that the cells introduced via the injection needle are removed from the carrier flow get carried away.
  • a disadvantage of this known particle injector is the loss of cells that arises from cell deposits in the particle injector. In extreme cases, these cell deposits can lead to clogging of the particle detector, which hinders the conveyance of the carrier flow or even completely Brings to a standstill. This has a particularly strong effect in fluidic systems with low delivery rates of, for example, less than 200 ⁇ l / h.
  • the object of the invention is therefore to minimize the loss of cells due to particle deposits in the known particle injector described above and to prevent clogging of the particle injector.
  • a particle injector is to be created, the optionally continuous or a discontinuous 'injection of particles in a fluidic microchip ( "lab-on-chip"), wherein a long-lasting (for example in the range of hours), preferably' uniform loading of the Systems with particles should be achieved.
  • a separation of the particles should also be ensured, which counteracts disruptive aggregate formation.
  • the carrier flow channel between the inlet of the particle injector and the outlet of the particle injector is preferably free of dead spaces in order to prevent particles from becoming lodged in the flow channel.
  • the ' carrier flow channel of the particle injector therefore preferably has a smooth inner contour without projections or depressions which could hinder a laminar flow.
  • the inner contour of the carrier flow channel therefore preferably has a continuously differentiable surface.
  • the carrier flow channel in the particle injector preferably even has a constant flow cross section between the inlet and the outlet, since any change in cross section in the carrier flow channel facilitates the setting of particles.
  • the cross section of the carrier flow channel is preferably circular, but the carrier flow channel in the particle injector according to the invention can also be elliptical or angular in shape.
  • the injection channel for the injection of the particles opens at an obtuse angle and preferably at a right angle into the carrier flow channel, so that the particle injector can also be referred to as a T-injector.
  • An advantage of such a geometrical arrangement of the injection channel is the fact that the carrier stream flowing in the carrier flow channel entrains the particles to be injected.
  • the invention is not restricted to an obtuse-angled junction of the injection channel into the carrier flow channel. It is also possible, for example, for the injection channel to run coaxially with the carrier flow channel, as in the aforementioned US Pat. No. 5,489,506, in order to coaxially inject the particles into the carrier stream.
  • the injection channel is preferably used not only to inject the particles, but also to mechanically guide an injection needle, which is pierced, for example, through a septum and can be inserted into the injection channel.
  • the injection channel therefore preferably has an inside diameter that is slightly larger than the outside diameter of the injection needle.
  • the injection needle preferably forms a clearance fit or a transition fit with the injection channel of the particle injector in order to achieve good mechanical guidance of the injection needle.
  • the insertion of the injection needle into the injection channel can be facilitated by an insertion aid, which preferably consists of a funnel-shaped cross-sectional expansion of the injection channel.
  • the insertion aid for the injection needle is preferably arranged in a separate component which is detachably attached to the particle injector.
  • this separate component which serves as an insertion aid, can be screwed onto the particle injector or connected in some other way to the particle injector.
  • the insertion aid it is alternatively also possible for the insertion aid to be arranged in one piece on the particle injector, so that a separate component as an insertion aid can be dispensed with.
  • the above-mentioned septum for sealing the injection channel is preferably interchangeable and constructed in multiple layers.
  • the septum can have a silicone core that is coated on both sides with Teflon.
  • the fluid injector of the particle injector according to the invention is preferably made by hoses that are attached to the inlet or outlet of the particle injector. With this fluidic contacting, it is desirable that as little cross-sectional jumps as possible occur at the transition point between the hoses and the carrier flow channel in order to prevent particles from accumulating there.
  • the particle injector according to the invention therefore preferably has a centering aid at the inlet and / or at the outlet, so that the hose is mounted as coaxially as possible to the carrier flow channel.
  • Such a centering aid can consist, for example, of an essentially hollow cylindrical receptacle which is adjacent to the carrier flow duct and is arranged coaxially with the carrier flow duct, the inside diameter of the receptacle being larger than the inside diameter of the carrier flow duct by the wall thickness of the line to be connected.
  • the line is thus inserted into the hollow cylindrical receptacle, which runs coaxially to the carrier flow channel and thereby ensures a corresponding coaxial alignment of the line.
  • the particles are injected into the carrier flow channel preferably vertically from top to bottom with respect to the gravity acting on the particle injector, the injection channel being arranged on the top of the particle injector.
  • the effect of gravity favors the introduction of the particles into the carrier flow channel.
  • the cross section of the injection channel tapers conically toward the carrier flow channel, which also facilitates the insertion of an injection needle into the injection channel.
  • the conical taper of the injection channel also has a funnel function, since the particles converge in the lower region of the injection channel, so that no or only a few particles in the injection channel get stuck, which ensures a continuous particle supply.
  • the injection channel can taper towards the carrier flow channel with a cone angle between 5 ° and 45 °, any intermediate values being possible.
  • the inlet of the carrier flow channel is arranged on the underside of the particle injector, while the outlet of the carrier flow channel is located on the top of the particle injector, so that the carrier flow is directed from bottom to top.
  • the injection channel can open laterally into the carrier flow channel, the carrier flow channel preferably having a cross section that widens from the inlet to the outlet.
  • the carrier flow channel can narrow conically towards the inlet with a cone angle between 5 ° and 45 °, any intermediate values being possible.
  • Such a narrowing of the cross section of the carrier flow channel towards the inlet located below is advantageous, since it counteracts clogging of the carrier flow channel.
  • Sedimentation effects in the carrier flow channel could lead to particle deposits in the lower region of the carrier flow channel.
  • the narrowing of the cross-section in the lower region of the carrier flow channel leads to a corresponding increase in the flow velocity, which largely prevents sedimentation deposits with the risk of clogging.
  • the carrier flow channel preferably has a volume between the inlet and the outlet which is between 0.02 ⁇ l and 5 ⁇ l, any intermediate values being possible.
  • the volume of the carrier flow channel between the inlet and the outlet between see 20 ⁇ l and 50 ⁇ l, whereby any intermediate values are also possible.
  • this volume can even comprise up to 1 ml or more, so that, as a result, volumes between 0.02 ⁇ l and more than 1 ml are possible.
  • the injection channel opens into the carrier flow channel at an angle from above, the carrier flow channel preferably running vertically.
  • the carrier flow channel flows through from bottom to top, the suspended particles are then carried upwards and rinsed out of the particle injector.
  • the angle between the injection channel and the carrier flow channel can be, for example, between 10 ° and 80 °, any intermediate values being possible.
  • a ' stirring chamber can be arranged in the particle injector, in which there is a magnetic stirring rod. This advantageously makes it possible to mix the carrier stream with the particles suspended therein in the stirring chamber with a conventional magnetic stirrer.
  • the particle injector according to the invention can have two carrier flow inlets via which two carrier flows are supplied, the two carrier flow inlets preferably opening into a single carrier flow outlet.
  • the two carrier flow inlets can be arranged laterally and opposite one another. It is also advantageous if the carrier flow channel is guided in a different shape in the particle injector between the inlet and the outlet. The narrowing and widening in the course of the carrier flow channel counteracts the sedimentation of the particles in the carrier flow channel, so that the suspended particles move uniformly and continuously.
  • the particle injector according to the invention is preferably autoclavable in order to enable sterilization of the particle injector.
  • PEEK is therefore preferably suitable as the material for the particle injector, but the particle injector according to the invention can also consist of other materials.
  • the particle injector consists of a heat-conductive material in order to be able to measure or influence the temperature of the particle injector.
  • the particle injector is therefore preferably connected to a temperature sensor and / or to a temperature control element, wherein the temperature control element preferably enables both heating and cooling of the particle injector and can consist, for example, of a Peltier element.
  • the particle injector according to the invention can be produced, for example, by machining shaping processes or by injection molding, but the invention is not restricted to these production processes.
  • the invention also comprises a microfluidic system with the particle injector according to the invention, the particle injector preferably being arranged in a carrier flow line which opens into a cell sorter.
  • a plurality of particle injectors according to the invention can be arranged in succession in the carrier flow line in order to be able to inject different particles in succession. Instead of particles, you can use the individual certain reagents or reaction solutions are added in each case.
  • particle used in the context of the invention is to be understood generally and is not restricted to individual biological cells. Rather, the particle injector according to the invention can work with different types of particles, in particular synthetic or biological particles. Particular advantages result when the particles biological materials, "ie, for example, biological cells, cell groups, cell components or biologically relevant macromolecules, each optionally in combination with other biological particles or synthetic carrier particles comprise. Synthetic particles can comprise solid particles, liquid particles delimited from the suspension medium or multi-phase particles which form a separate phase with the suspension medium in the carrier flow channel.
  • Figure 1 shows a cell sorter with an inventive
  • FIGS. 2-4 cross-sectional views of various alternative exemplary embodiments of the particle injector
  • FIG. 5 shows a side view of an insertion aid to facilitate the insertion of an injection needle into the particle injector according to the invention
  • FIG. 6 shows a variant of a microfluidic system with a particle injector according to the invention
  • FIG. 7 shows a further exemplary embodiment of a particle injector according to the invention with an integrated magnetic stirring bar
  • FIG. 8 shows a further exemplary embodiment of a particle injector according to the invention with an angled guidance of the carrier flow
  • FIG. 9 shows an exemplary embodiment of a particle injector according to the invention, in which the particles are injected obliquely into the carrier flow
  • FIG. 10 shows another exemplary embodiment of a particle injector according to the invention with two opposite carrier flow feeds
  • FIG. 11 shows a perspective illustration of a particle injector according to the invention
  • FIG. 12 shows a further exemplary embodiment of a particle injector according to the invention with a meandering guidance of the carrier flow channel.
  • FIG. 1 shows a cell sorter according to the invention, which uses a microfluidic sorting chip 1 to sort biological cells dielectrophoretically.
  • the sorting chip 1 has a plurality of connections 2-6 for fluidic contacting, the fluidic contacting of the
  • connection 2 of the sorting chip 1 serves to receive a carrier current with the biological cells to be sorted, while the connection 3 of the sorting chip 1 serves to discharge the selected biological cells, which are not further examined on the sorting chip 1.
  • the selected biological cells can be collected by an injection syringe 7, which can be connected to the connection 3 of the sorting chip 1.
  • the output 5 of the sorting chip 1, serves to remove the biological cells of interest, which can then be further processed or examined.
  • connections 4 and 6 of the sorting chip 1 serve to supply a so-called enveloping current, which has the task of leading the selected biological cells to the connection 5 of the sorting chip 1.
  • enveloping current which has the task of leading the selected biological cells to the connection 5 of the sorting chip 1.
  • connections 4 and 6 of the sorting chip are connected via two sheath flow lines 8, 9, a Y-piece 10 and a four-way valve 11 to a pressure container 12 in which a cultivation medium for the sheath flow is located.
  • a so-called manipulation buffer can also be located in the pressure container 12.
  • the pressure vessel 12 is pressurized via a compressed air line 13, so that the culture medium in the pressure vessel 12 is in a corresponding position of the four-way valve 11 via the Y-piece 10 and the sheath flow lines 8, 9 to the connections 4, 6 of the sorting chip 1 flows.
  • connection 2 of the sorting chip 1 is connected via a carrier current line 14 to a particle injector 15, of which various alternative exemplary embodiments are shown in FIGS. 2 to 4 and will be described in detail later.
  • the particle injector 15 is connected via a T-piece 16 to a carrier flow syringe 17, which is mechanically driven and injects a predetermined liquid flow of a carrier flow.
  • the T-piece 16 is connected upstream via a further four-way valve 18 and a sheath flow line 19 to a three-way valve 20.
  • the three-way valve 20 enables the sheath flow lines 8, 9 and the carrier flow line 14 to be flushed before the actual operation.
  • the three-way valve 20 is connected upstream via a peristaltic pump 21 to three three-way valves 22.1-22.3, to each of which a syringe reservoir 23.1-23.3 is connected.
  • the syringe reservoirs 23.1-23.3 are used to supply a filling stream for flushing the entire fluidic system before the actual operation, the syringe reservoir 23.1 containing 70% ethanol, while the Syringe reservoir 23.2 contains aqua destillata as filler substance.
  • the syringe reservoir 23.3 finally contains a buffer solution as the filling flow substance, wherein another manipulation solution, such as a physiological saline solution, can alternatively also be used as the filling flow substance.
  • another manipulation solution such as a physiological saline solution
  • the cell sorter has a collecting container 27 for excess envelope flow and a collection container 28 for excess filling flow.
  • the three-way valve 22.1 is first opened and ethanol is injected from the syringe reservoir 23.1 as a filling stream, the ethanol being first conveyed to the three-way valve 20 by the peristaltic pump 21.
  • the three-way valve 20 is set in such a way that a part of the filling flow conveyed by the peristaltic pump 21 is passed on via the filling flow line 19, while the remaining part of the filling flow conveyed by the peristaltic pump 21 is passed on to the four-way valve 11 arrives.
  • the two four-way valves 11, 18 are in turn set such that the filling flow is passed through the sheath flow lines 8, 9 and the carrier flow line 14. Cultivation medium also flows from the pressure container 12 into the collecting container 27 in order to briefly flood the lines. •
  • the three-way valves 22.1-22.3 are closed and the peristaltic pump 21 is switched off.
  • the four-way valve 11 is set in such a way that the pressure vessel 12 is connected to the Y-piece 10, so that the culture medium located in the pressure vessel 12, due to the excess pressure prevailing in the pressure vessel 12, into the sheath flow lines 8, 9 is pressed.
  • the four-way valve 18 is set during the sorting operation so that there is no flow connection between the T-piece 16 and the four-way valve 18.
  • the carrier flow injected by the carrier flow syringe 17 then flows via the T-piece 16 into the particle injector 15, wherein 29 biological cells are injected into the carrier flow by a further injection syringe.
  • the carrier current with the injected biological cells then flows from the particle injector 15 via the carrier current line 14 to the connection 2 of the sorting chip.
  • a temperature sensor 30 is attached to the particle injector 15 in order to measure the temperature T of the particle injector 15.
  • a temperature control element 31 in the form of a Peltier element is located on the particle injector 15 in order to be able to heat or cool the particle injector 15.
  • the heating or cooling energy Q is predefined here by a temperature controller 32, which is connected on the input side to the temperature sensor 30 and regulates the temperature T of the particle injector 15 to a predetermined setpoint.
  • the particle injector 15 has a base body 33 made of PEEK, which is autoclavable and thus enables simple and / or multiple sterilization.
  • the particle injector 15 has an inlet 34 with an internal thread 35, into which a screw flange of a connecting hose 36 can be screwed, the screw flange not being shown for the sake of simplicity.
  • the particle injector 15 has an outlet 37 with an internal thread 38, into which a screw flange of a connection hose 39 can also be screwed, the screw flange of the connection hose 39 also not being shown for the sake of simplicity.
  • the particle injector 15 has a centering aid 40, 41, which consists of a cylindrical receptacle and adjoins the inlet 34 and 37, respectively.
  • a carrier flow channel 42 runs between the two centering aids 40, 41 coaxial to the two centering aids 40, 41, the inside diameter of the two centering aids 40, 41 being larger by the wall thickness of the two connecting hoses 36, 39 than the inside diameter of the carrier flow channel 42.
  • An injection channel 43 opens into the carrier flow channel 42 at right angles to the carrier flow channel 42, into which an injection needle of the injection syringe 29 can be inserted for the injection of biological cells, the injection needle of the injection syringe 29 piercing a septum 44.
  • FIG. 3 shows an alternative exemplary embodiment of an injector 15 ′, which largely corresponds to the exemplary embodiment described above and shown in FIG. 2. To avoid repetition, reference is therefore made below to the description of FIG. 2 described above, the same reference numerals as in FIG. 2 being used for corresponding parts, which are identified only by an apostrophe for differentiation.
  • a special feature of the particle injector 15 ' is that the inlet 34' for the carrier stream is arranged on the underside of the particle injector 15 ', while the outlet 37' for the carrier stream with the injected biological cells is located on the top of the particle injector 15 '.
  • the carrier flow thus runs vertically from bottom to top in the ' particle injector 15', the injection channel 43 'opening laterally into the carrier flow channel 42'.
  • Another special feature of the particle injector 15 from above ' is the cross-section of the carrier flow channel 42 that' according tapered downward so that the flow velocity of the carrier stream in the Tragerstromkanal 42 'corresponding to "top to increases below. • This increase in the flow velocity in sedimentation deposits ' on the underside of the carrier flow channel 42 'are counteracted to the carrier flow channel 42'.
  • FIG. 4 shows a further alternative exemplary embodiment of a particle injector 15 ′′, which likewise largely corresponds to the particle injector 15 described above and shown in FIG. 2. To avoid repetition, therefore, reference is also made in the following to the description above for FIG. 2, whereby the same reference numerals are used for corresponding parts, which are only identified by two apostrophes.
  • a special feature of the particle injector 15 is that the cross section of the injection channel 43" widens upward towards its mouth opening, so that the injection needle of the injection syringe 29 can be inserted more easily.
  • the conical taper of the injection channel 43 also has a funnel function, since the particles converge in the lower region of the injection channel 43", so that no or only a few particles remain in the injection channel 43 ′′, which ensures a continuous particle supply.
  • the cross-sectional expansion of the injection channel 43 "moreover" offers the advantage that the injection channel 43 "has an additional injection volume in the range of 5-100 ⁇ l.
  • FIG. 5 shows an exemplary insertion aid 45 for the injection needle of the injection syringe 29, the insertion aid 45 being designed as a separate component.
  • the insertion aid 45 has on its underside a cylindrical section 46 with an external thread 47, which can be screwed into a corresponding internal thread of the particle injectors 15 'or 15 "in order to close the insertion aid 45 on the particle injector 15' or 15" fasten.
  • the insertion aid 45 is screwed in manually via knurling 48, which is attached to an upper section of the insertion aid 45.
  • the insertion aid there is a continuation 49 of the injection channel 43 or 43 ', which merges into a funnel-shaped enlargement 50 on its upper side in order to facilitate the insertion of the injection needle of the injection syringe 29.
  • FIG. 6 finally shows a modification of the area outlined in dashed lines in FIG. 1, so that in the following, to avoid repetitions, reference is largely made to the description of FIG. 1.
  • the same for corresponding components reference numerals are used that are marked to avoid repetition only by additional indices.
  • a special feature of this modification is that three particle injectors 15.1-15.3 are arranged one behind the other in the carrier flow line 14 ', so that three different particles can be injected into the carrier flow. ' -' "'
  • FIG. 7 shows a further exemplary embodiment of a particle injector 51 according to the invention with an inlet 52 for receiving a carrier stream and an outlet 53 for delivering the carrier stream with particles suspended therein.
  • the inlet 52 opens into the particle injector 51 into a stirring chamber 54, in which there is a magnetic stirring rod, which is not shown for the sake of simplicity.
  • the carrier liquid located in the stirring chamber 54 can therefore be stirred by a conventional magnetic stirrer, which leads to thorough mixing of the carrier liquid with the particles suspended therein.
  • the stirring speed is chosen so that the particles suspended in the carrier liquid are not damaged by the stirring process.
  • the particle injector 51 consists of a lower part 55 and an upper part 56, the stirring chamber 54 in the lower part
  • the lower part 55 is arranged. In the assembled state, the lower part 55 is firmly connected to the upper part 56 and sealed by an O-ring located between them.
  • the particles are injected into the carrier stream via an injection channel 57, which opens into the stirring chamber 54 at the side next to the outlet 53 * .
  • the injection channel 57 can in this case be closed by a septum, as has already been described above.
  • the inlet 52 for the carrier stream lies on the underside of the particle injector 51, while the outlet 53 is arranged on the top side, so that the carrier stream flows through the particle injector 51 from bottom to top. -; " ., • ⁇ •
  • the inlet 52 is arranged on the upper side of the particle injector 51, while the outlet 53 is located on the underside of the particle injector 51, so that the carrier flow flows through the particle injector 51 from top to bottom.
  • Parallelization is also possible here and a valve can be arranged between the stirring chamber 54 and the outlet 53 in order to enable a discontinuous dispensing.
  • FIG. 8 shows a further exemplary embodiment of a particle injector 58 according to the invention with an inlet 59 for receiving a carrier stream and an outlet 60 for delivering the carrier stream with particles suspended therein.
  • Inlet 59 is located on the left side of particle injector 58, while outlet 60 is located on the underside of particle injector 58.
  • the carrier stream is thus deflected downward in the particle injector 58 by 90 °.
  • the particle injector 58 has an injection port 61, which is arranged on the upper side of the particle injector 58 and is closed by a septum 62.
  • An injection needle pierces the septum 62 to inject particles into the carrier stream.
  • the sedimentation chamber 63 can alternatively also be conical.
  • FIG. 9 shows a further exemplary embodiment of a particle injector 65 according to the invention with an inlet 66 for the carrier stream and an outlet 67 for dispensing the carrier stream with the particles suspended therein.
  • the inlet 66 for the carrier stream is located on the underside of the particle injector 65, while the outlet 67 is arranged on the top side, so that the carrier stream flows through the particle injector 65 from bottom to top.
  • the inlet 66 is connected to the through a carrier flow channel 68
  • Outlet 67 connected, an injection channel 69 opening at an angle into the carrier flow channel 68 from above, which starts from an injection port 70, the injection port 70 being closed by a septum 71 in the manner described above.
  • a particle suspension is injected through the injection port 70 and is distributed in the elongated injection channel 69.
  • the particles begin to sink due to gravity.
  • carrier stream entering from below into the particle injector 65, and by the embodiment shown narrowing of the flow channel 68 • carrier forms a jet out of the already sunken and other still sinking particles receiving and flowing out of the particle injector 65 upwards.
  • the elongated carrier flow channel 68 can vary depending on the length and cross-section, the carrier flow velocities achieved and the volumes injected.
  • FIG. 10 shows a further exemplary embodiment of a particle injector 72 according to the invention with two laterally arranged, opposing inlets 73, 74 for receiving two carrier streams, the two inlets 73, 74 opening in the middle of the particle injector 72 into a vertical cylindrical injection channel 75.
  • the injection channel 75 starts from an injection port 76 arranged on the upper side of the particle injector 72 and opens into an outlet 77 on the underside of the particle injector 72 for delivering the carrier flow with the particles suspended therein.
  • FIG. 11 shows a perspective illustration of a further exemplary embodiment of a cube-shaped particle injector 78 according to the invention with an inlet 79 for receiving a carrier flow and an outlet 80 for discharging the carrier flow with particles suspended therein, the inlet 79 inside the particle injector 78 through a carrier flow channel with the Outlet 80 is connected.
  • the inlet 79 is located on the side of the particle injector 78 in the lower third, while the outlet 80 is arranged in the center on the top of the particle injector 78.
  • FIG. 12 finally shows an exemplary embodiment of a particle injector 82 according to the invention with a meandering guidance of a carrier flow channel 83 between an inlet 84 and an outlet 85.
  • An injection port 86 opens into the carrier flow channel 83, which is guided in a meandering shape, via which particles can be injected into the carrier stream.
  • the narrowing and widening in the course of the carrier flow channel 83 counteracts the sedimentation of the particles in the carrier flow channel 83, so that the suspended particles move uniformly and continuously.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Abstract

L'invention concerne un injecteur de particules (15) destiné à l'introduction de particules dans un flux porteur d'un système microfluidique, notamment destiné à l'injection de cellules biologiques dans le flux porteur d'un séparateur de cellules. Ledit injecteur de particules comporte un orifice d'entrée destiné à l'admission d'un flux porteur, un orifice de sortie destiné à la distribution du flux porteur contenant les particules introduites, un canal de flux porteur reliant l'orifice d'entrée à l'orifice de sortie, et un canal d'injection aboutissant dans le canal de flux porteur, destiné à l'introduction des particules dans le flux porteur. Selon l'invention, le canal de flux porteur est essentiellement libre d'espaces morts.
EP04731920A 2003-05-09 2004-05-10 Injecteur de particules destine a un separateur de cellules Withdrawn EP1623206A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10320870A DE10320870A1 (de) 2003-05-09 2003-05-09 Partikelinjektor für einen Zellsortierer
PCT/EP2004/004984 WO2004099760A1 (fr) 2003-05-09 2004-05-10 Injecteur de particules destine a un separateur de cellules

Publications (1)

Publication Number Publication Date
EP1623206A1 true EP1623206A1 (fr) 2006-02-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04731920A Withdrawn EP1623206A1 (fr) 2003-05-09 2004-05-10 Injecteur de particules destine a un separateur de cellules

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WO2004099760A1 (fr) 2004-11-18
US20060115890A1 (en) 2006-06-01
DE10320870A1 (de) 2004-12-09
US7510685B2 (en) 2009-03-31

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