CN205517818U - Little valve of choked flow - Google Patents
Little valve of choked flow Download PDFInfo
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- CN205517818U CN205517818U CN201620267293.4U CN201620267293U CN205517818U CN 205517818 U CN205517818 U CN 205517818U CN 201620267293 U CN201620267293 U CN 201620267293U CN 205517818 U CN205517818 U CN 205517818U
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Abstract
The utility model relates to a micro -fluidic chip especially relates to a little valve of choked flow, include the fluid control chamber and communicate in fluid control chamber feed liquor side respectively and go out feed liquor groove and the out liquid tank that liquid inclined, the internal diameter of fluid control chamber feed liquor side is greater than the internal diameter in feed liquor groove, the internal diameter in fluid control chamber reduces to going out liquid side direction along the feed liquor side gradually, the utility model discloses a little valve of choked flow effectively stops the liquid among the micro -fluidic chip to flow out under the no ambient pressure circumstances.
Description
Technical field
This utility model relates to a kind of micro-fluidic chip, particularly relates to a kind of micro-valve of choked flow.
Background technology
Clinical unit carries out the main method of whole blood separation at present is by blood taking tube centrifugation: one is separation gel coagulant blood taking tube, uses 3000rpm low-speed centrifugal, makes erythrocyte and serum because density difference is layered the both sides of separation gel；Blood taking tube there are coagulant composition and separation gel, coagulant composition can promote coagulation process, make erythrocyte and blood coagulating protein gather together, be more easy to be centrifuged.It two is EDTA/ sodium citrate/anticoagulant heparin blood taking tube, also it is clinical common blood taking tube, with the addition of EDTA/ sodium citrate/heparin sodium anticoagulant composition the most respectively, coagulation process can be hindered, under conditions of 3000rpm low-speed centrifugal, erythrocyte can be layered with blood plasma.In addition, Chinese patent publication No. is the utility model patent of CN204544220U, also disclosing a kind of rotating centrifugal whole blood separating chips and preparation method thereof, erythrocyte is separated with blood plasma by it by centrifugal force, and forms a siphonage after centrifugal end by supernatant separation.But use this patented technology to have the high requirement of comparison to applied sample amount and erythrocyte proportion, applied sample amount can cause realizing siphon very little, erythrocyte proportion during too conference causes siphonic process erythrocyte be inhaled into collecting bin, using effect is unstable；And the method need to use centrifugation apparatus, relatively costly.
Micro-fluidic chip is also known as chip lab (Lab-on-a-Chip), it it is a kind of micro-full analytical system (μ-TAS), it is a kind of to manipulate the system that micro volume fluid flows in minim channel or component, relates to multiple basic subject fields such as physics, chemistry, biology.Micro-fluidic chip, based on microflow control technique, comprises the little nanoscale devices such as the other passage of micron to nano grade, chamber, valve, pump, utilizes the motion of its Characteristics Control fluid and physicochemical change.
Pass through micro-fluidic chip, whole blood can be realized separate, but in whole blood separation process, in order to realize quantitatively pipetting, need on chip, arrange the micro-valve of choked flow, to stop the liquid in micro-fluidic chip to flow out in the case of without ambient pressure, and for the realization of the micro-valve of choked flow on little nanoscale devices, lack preferable way at present.
Because above-mentioned defect, the design people, the most in addition research and innovation, to founding a kind of micro-valve of choked flow to apply on micro-fluidic chip so that it is have more the value in industry.
Utility model content
For solving above-mentioned technical problem, the micro-valve of choked flow that the liquid that the purpose of this utility model is to provide in a kind of effective prevention micro-fluidic chip flows out in the case of without ambient pressure.
This utility model first aspect provides a kind of micro-valve of choked flow, including stream control chamber and be respectively communicated with at stream control chamber liquid feeding side and the lead channel of tapping side and liquid outlet groove, the internal diameter of described stream control chamber liquid feeding side is more than the internal diameter of lead channel, and the internal diameter in described stream control chamber is gradually reduced along liquid feeding side to tapping side direction.
Further, the floor height of described stream control chamber liquid feeding side is less than the floor height of described lead channel, and the internal diameter of described stream control chamber tapping side is consistent with the internal diameter of liquid outlet groove.
Further, front cavity that is that described stream control chamber includes laying respectively at liquid feeding side and tapping side and that be interconnected and rear chamber, described front cavity is cubic type, and the internal diameter of described rear chamber is gradually reduced along liquid feeding side to tapping side direction.
Further, the end face of described lead channel, front cavity, rear chamber and liquid outlet groove is generally aligned in the same plane, and the bottom of described rear chamber gradually rises along liquid feeding side to tapping side direction, and the width of described rear chamber tapers into along liquid feeding side to tapping side direction.
Further, the degree of depth of described front cavity is 650-750 μm, and width is 950-1050 μm.
Further, the degree of depth of described lead channel and liquid outlet groove is 250-350 μm, and width is 250-350 μm.
This utility model second aspect provides a kind of Whole Blood Filtration using the micro-valve of aforementioned choked flow and quantitatively pipettes micro-fluidic chip, whole blood separating mechanism, the micro-valve of anti-backflow, liquid quantitative mechanism, PF mechanism, the micro-valve of choked flow and the liquid outlet mechanism including chip body and being arranged in chip body；Wherein:
Described whole blood separating mechanism includes inlet, whole blood filter membrane and the collector unit set gradually, described whole blood filter membrane is for the blood filtration isolated blood plasma that will enter from inlet, and described collector unit is for collecting the blood plasma of isolated and through anti-backflow micro-valve, blood plasma being sent to liquid quantitative mechanism under capillary action；
The micro-valve of described anti-backflow is for stoping the blood plasma adverse current in liquid quantitative mechanism to whole blood separating mechanism；
Described liquid quantitative mechanism includes the liquid storage cylinder for housing quantitative blood plasma；
The micro-valve of described choked flow is arranged on the outfan of liquid quantitative mechanism and for stoping the blood plasma in liquid storage cylinder to flow out in the case of without ambient pressure；
Described PF mechanism includes the propelling sap cavity for housing PF and propulsion unit, and described propulsion unit for pushing to liquid storage cylinder under pressure and through choked flow micro-valve, the quantitative blood plasma in liquid storage cylinder being pushed to liquid outlet mechanism by the PF of PF intracavity；
Described liquid outlet mechanism includes liquid outlet, described liquid outlet blood plasma after discharging Quantitative Separation.
By such scheme, this utility model at least has the advantage that and can effectively stop the liquid in micro-fluidic chip to flow out in the case of without ambient pressure.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be practiced according to the content of description, below with preferred embodiment of the present utility model and coordinate accompanying drawing describe in detail as after.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the structural representation of this utility model the second embodiment；
Fig. 3 is the structural representation of this utility model chips upper slice；
Fig. 4 is the structural representation of this utility model chips bottom sheet；
Fig. 5 is the partial enlarged drawing in A portion in Fig. 4；
Fig. 6 is that in this utility model, tongue piece declines the structural representation of valve；
Fig. 7 is the partial enlarged drawing in B portion in Fig. 4；
Fig. 8 is the structural representation of S type capillary channel liquid storage cylinder in this utility model；
Fig. 9 is the structural representation of PF mechanism in this utility model；
Figure 10 is the structural representation of the first liquid outlet mechanism in this utility model；
Figure 11 is the structural representation of the second liquid outlet mechanism in this utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, detailed description of the invention of the present utility model is described in further detail.Following example are used for illustrating this utility model, but are not limited to scope of the present utility model.
Embodiment one
See Fig. 1, the micro-valve of a kind of choked flow of this utility model one preferred embodiment, including stream control chamber 601 and be respectively communicated with at stream control chamber liquid feeding side and the lead channel 604 of tapping side and liquid outlet groove 605, the internal diameter of stream control chamber liquid feeding side is gradually reduced to tapping side direction along liquid feeding side more than the internal diameter of lead channel, the internal diameter in stream control chamber.
The micro-valve of choked flow utilizes liquid surface infiltration masterpiece to be valve resistance, and when liquid flows to the micro-valve of choked flow, liquid surface area increases suddenly, thus needs a large amount of liquid volume, thus liquid capillary flow forward is created large drag forces, thus plays the effect of choked flow；After liquid is pushed the stream control chamber of the micro-valve of choked flow by applying pressure, its structural table area is saturated rapidly, makes choked flow micro-valve that subsequent liquid flowing is not produced obstruction.
In order to effectively increase liquid flow to choked flow micro-valve time, the surface area of liquid, the floor height of stream control chamber 601 liquid feeding side is less than the floor height of lead channel 604, and the internal diameter of stream control chamber 601 tapping side is consistent with the internal diameter of liquid outlet groove 605.
Specifically, stream control chamber 601 can be divided into two various sizes of cavitys, including front cavity 602 that is that lay respectively at liquid feeding side and tapping side and that be interconnected and rear chamber 603, front cavity is cubic type, and the internal diameter of rear chamber is gradually reduced along liquid feeding side to tapping side direction.
The end face of lead channel 604, front cavity 602, rear chamber 603 and liquid outlet groove 605 is generally aligned in the same plane, and the bottom of rear chamber 603 gradually rises along liquid feeding side to tapping side direction, and the width of rear chamber 603 tapers into along liquid feeding side to tapping side direction.
The degree of depth of front cavity 602 is 650-750 μm, and width is 950-1050 μm.The degree of depth of lead channel and liquid outlet groove is 250-350 μm, and width is 250-350 μm.
Embodiment two
See Fig. 2 to Fig. 4, this utility model provides a kind of Whole Blood Filtration and quantitatively pipettes micro-fluidic chip, whole blood separating mechanism 2, the micro-valve of anti-backflow 3, liquid quantitative mechanism 4, PF mechanism 5, the micro-valve of choked flow 6 and the liquid outlet mechanism 7 including chip body 1 and being arranged in chip body.
Should be noted that, whole blood separating mechanism 2, the micro-valve of anti-backflow 3, liquid quantitative mechanism 4, PF mechanism 5, the micro-valve of choked flow 6 and liquid outlet mechanism 7 can be by various ways such as Laser Processing, model injection moldings in the internal molding of chip body, also can process given shape on chip upper slice 11 or chip bottom sheet 12 by being set to chip upper slice 11 and the chip bottom sheet 12 of separate type, then mutually encapsulate together；Owing to former processing mode is relatively complicated, this is repeated no more by this utility model, and in subsequent embodiment, this utility model, with chip body separate design for chip upper slice 11 or the mode of chip bottom sheet 12 then mutually encapsulation, is described further.
Whole blood separating mechanism 2 includes inlet 201, whole blood filter membrane (not shown) and the collector unit 202 set gradually, and wherein inlet 201 and whole blood filter membrane may be provided on chip upper slice 11, and collector unit is arranged in chip bottom sheet 12；Whole blood filter membrane is for the blood filtration isolated blood plasma that will enter from inlet 201, and collector unit 202 is for collecting the blood plasma of isolated and through the micro-valve of anti-backflow 3, blood plasma being sent to liquid quantitative mechanism 4 under capillary action；
The micro-valve of anti-backflow 3 is for stoping the blood plasma adverse current in liquid quantitative mechanism to whole blood separating mechanism 2；
Liquid quantitative mechanism 4 includes the liquid storage cylinder for housing quantitative blood plasma；
The micro-valve of choked flow 6 is arranged on the outfan of liquid quantitative mechanism 5 and for stoping the blood plasma in liquid storage cylinder to flow out in the case of without ambient pressure；
PF mechanism 5 includes the propelling sap cavity for housing PF and propulsion unit, and propulsion unit for pushing to liquid storage cylinder under pressure and through choked flow micro-valve, the quantitative blood plasma in liquid storage cylinder being pushed to liquid outlet mechanism by the PF of PF intracavity；
Liquid outlet mechanism 7 includes liquid outlet 701, the liquid outlet 701 blood plasma after discharging Quantitative Separation.
Collector unit 202, the micro-valve of anti-backflow 3, liquid quantitative mechanism 4, PF mechanism 5, the micro-valve of choked flow 6 and liquid outlet mechanism 7, can be arranged in chip bottom sheet, and chip upper slice is encapsulated in chip bottom sheet, packing forms can use the one that mucilage binding, card fill, clamp etc. in various ways, it is possible to is used in conjunction with each other；Wherein, mucilage binding can use the modes such as double faced adhesive tape, heat-curable glue, optic-solidified adhesive, card dress can use that to be respectively provided with the fastener cooperated and draw-in groove in chip upper slice and chip bottom sheet fixing with card dress, clamps and can use the fixture being separately configured, clamps fixing by chip upper slice and chip bottom sheet；Additionally, relate to the micro-valve of anti-backflow 3, liquid quantitative mechanism 4, PF mechanism 5, the micro-valve of choked flow 6 and the region of liquid outlet mechanism 7, in order to prevent blood plasma from flowing out, also can arrange and seal structure accordingly, such as sealing gasket or the sealing ridge cooperated and groove etc., also mucilage binding can be coordinated, to reach the effect sealed.
Should be noted that; each structure shown in accompanying drawing 2 to 4; it is only used for illustrating the function that whole blood separating mechanism 2, the micro-valve of anti-backflow 3, liquid quantitative mechanism 4, PF mechanism 5, the micro-valve of choked flow 6 and liquid outlet mechanism 7 are played; every micro-fluidic structure being capable of above-mentioned technique effect; protection domain of the present utility model all should be fallen into, and be not limited to the structure shown in accompanying drawing.
Embodiment three
See Fig. 3 to Fig. 5, this utility model provides a kind of whole blood separating mechanism 2 realizing function described in embodiment one, chip body 1 includes chip upper slice 11 and chip bottom sheet 12, inlet 201 is arranged at chip upper slice, and the size bottom inlet 201 is more than the size at top, or the bottom of inlet 201 is provided with the draw-in groove 203 caved inward, collector unit 202 includes collecting chamber 204, the multiple support columns 205 being arranged in collecting chamber 204, and supporting layer (not shown), supporting layer is arranged on support column 205, and realize fixing by the mutually encapsulation between chip upper slice and chip bottom sheet, such as the edge of supporting layer can be installed in draw-in groove 203；Whole blood filter membrane is arranged on supporting layer, and the edge of whole blood filter membrane can be installed in draw-in groove 203 between supporting layer and chip upper slice 11；Inlet 201 is arranged on the top of whole blood filter membrane.Should be noted that, the effect of supporting layer is to be supported on whole blood filter membrane the top of support column, on the one hand plays a supporting role, and on the other hand plays preventing whole blood filter membrane from mutually attaching with support column end face, increase the filter area of whole blood filter membrane, improve the effect of filter effect；The material of supporting layer can select multiple, such as the fibrous material of the short texture such as polyester film, glass fibre, from whole blood membrane filtration under blood plasma, can enter in collecting chamber 204 through the space in fibrous material.
Should be noted that, hemocyte not can be separated completely effectively by whole blood filter membrane with blood plasma, in order to prevent hemocyte from entering liquid quantitative mechanism 4, the bottom of collecting chamber 204 is provided with and is arranged as stair-stepping multiple base frame 206, support column 205 is arranged on base frame 206, the end face of support column 205 is mutually flush, and the liquid outlet 207 of collecting chamber 204 is positioned close to that side with the base frame of extreme higher position.Stair-stepping base frame 206, plays precipitation hemocyte and limits the hemocyte effect towards the displacement of liquid outlet direction, and the gap between the support column of spaced arrangement is played again filtration and limits the hemocyte effect towards the displacement of liquid outlet direction.Should be noted that, the quantity of base frame 206 is 3 to 5, the height of each ladder is about 150-250 μm, base frame negligible amounts is the most general for the restriction effect of hemocyte, and quantity is more, it is confined to the most again the thickness of chip body so that the height of base frame reduces, and reduces the filter effect of hemocyte on the contrary.
Embodiment four
See Fig. 6 and Fig. 7, this utility model provides multiple and realizes the micro-valve of the anti-backflow of function described in embodiment one 3, and identical with embodiment three, chip body 1 includes chip upper slice 11 and chip bottom sheet 12, the micro-valve of anti-backflow 3 is arranged in chip bottom sheet 12, and chip upper slice 11 plays the effect of sealing.The micro-valve of anti-backflow has multiple implementation, and valve as micro-in variable cross-section, tongue piece decline valve, the micro-valve of wall-attachment etc., it should be noted that every micro-valve of anti-backflow being capable of aforementioned function, all should fall into protection domain of the present utility model.Owing to chip body is lamellar, considering the problem such as practicality and production cost, in this utility model, preferred tongue piece declines valve and the micro-valve of wall-attachment to be described further.
As shown in Figure 6, the tongue piece valve that declines includes tongue piece 301, tongue piece 301 pressure differential with rear side on front side of liquid flow direction be on the occasion of and negative value in the case of be respectively opening and closure state；In other words, when in collector unit 202, collection obtains blood plasma, owing to the micro-valve of anti-backflow 3 is vacant near the side of liquid storage cylinder, front and back both sides exist on the occasion of pressure differential, blood plasma can pass through tongue piece and decline valve, when plasmaflux reaches certain value, or when PF enters liquid storage cylinder under the effect of propulsion unit, before and after the micro-valve of anti-backflow, there is balance or the pressure differential of negative value in the pressure of both sides, and tongue piece 301 deforms upon or displacement under pressure differential effect, is closed by the liquid outlet of collector unit 202.
Specifically, the tongue piece valve that declines includes valve channel 302, tongue piece chamber 303 and tongue piece 301, and tongue piece chamber 303 is arranged on valve channel 302, and one end of tongue piece 301 rotates or is fixedly installed on tongue piece intracavity.In the case of being rotatably connected, tongue piece intracavity is provided with rotating shaft 304, and one end of tongue piece 301 is provided with shaft hole 305, and tongue piece 301 is sleeved in rotating shaft 304 by shaft hole 305 and is relatively rotated；In the case of fixing connection, one end of tongue piece 301 is fixed on the side near collector unit, the tongue piece chamber, PF mechanism outfan is connected close to the position of the other end of tongue piece 301, now tongue piece 301 seals the outfan of PF mechanism, when PF is pushed to liquid quantitative mechanism 4 by PF mechanism 5, tongue piece 301 deforms upon under stress, thus pushes up means of press seals on valve channel, it is achieved the one-way flow of liquid.Should be noted that, when tongue piece is for being rotatably connected, it is possible to PF mechanism outfan is connected close to the position of the other end of tongue piece 301, tongue piece is set to have elasticity simultaneously and can deform upon, so under dual function, the effect controlling one-way flow is more preferable.Material for tongue piece 301 selects, and can use the tongue piece of soft silica gel material.
As shown in Figure 7, the micro-valve of wall-attachment includes main channel 311 and the multiple bypass channels 312 being connected in parallel on main channel, bypass channel 312 two ends all with identical with liquid flow direction in main channel towards being connected on main channel, in other words, on front side of bypass channel, liquid flow direction and the angle of liquid flow direction in main channel are more than 90 degree, and bypass channel rear side liquid flow direction and the angle of liquid flow direction in main channel are less than 90 degree；Bypass channel 312 includes the first bypass channel 313 set gradually on liquid flow direction along main channel, second bypass channel 314 and the 3rd bypass channel 315, first bypass channel, second bypass channel and the 3rd bypass channel are valve shape, and size tapers into, first bypass channel, second bypass channel and the 3rd bypass channel there is also situation about being overlapped mutually, the liquid feeding end of the i.e. second bypass channel is arranged between liquid feeding end and the liquid outlet of the first bypass channel, the liquid feeding end of the 3rd bypass channel is arranged between liquid feeding end and the liquid outlet of the second bypass channel.The quantity of bypass channel is relevant with anti-backflow effect, and bypass channel quantity is the most, and anti-backflow effect is the best.It should be noted that, main channel may be configured as linear type, it is possible to be set to S type, to increase reverse resistance flowing effect.
This kind of micro-valve of wall-attachment is referred to as again valve and declines valve, when during liquid is by Fig. 7, flow to the left in right side, in main channel, some liquid enters bypass channel, and converge with main channel in the outlet of bypass channel, certain energy is there is in this during converging, liquid in main channel is pressed to tube wall, owing to flow direction is identical, thus also makes the liquid flowing in main channel more stable；When liquid countercurrent, i.e. liquid is by when in Fig. 7, flow to the right in left side, and in main channel, some liquid enters bypass channel, and this partially liq flow direction in bypass channel exit flows to contrary with the liquid in main channel, therefore add local resistance, thus stop the adverse current of liquid.
Decline valve and the micro-valve of wall-attachment of tongue piece all can be effectively realized the anti-backflow function of liquid, and comparatively speaking, the decline anti-backflow effect of valve of tongue piece is more preferable, but production cost is higher, and the micro-valve of wall-attachment is Comparatively speaking, and production and processing is the simplest, and production cost is relatively low.
Embodiment five
See Fig. 4 and Fig. 8, this utility model provides a kind of liquid quantitative mechanism 4 realizing function described in embodiment one, identical with previous embodiment is, chip body 1 includes chip upper slice 11 and chip bottom sheet 12, liquid quantitative mechanism 4 is arranged in chip bottom sheet 12, and chip upper slice 11 plays the effect of sealing.Liquid storage cylinder in liquid quantitative mechanism 4, could be arranged to various structures, or is simply set to capillary tube or capillary channel.Should be noted that, the liquid storage amount of liquid storage cylinder and capillary tube or the internal diameter of capillary channel and length are relevant, in the case of internal diameter is certain, capillary tube or the capillary channel of the various shapes such as S type, circle can be used in the chip body of finite size, to change the liquid storage amount of liquid storage cylinder.
Embodiment six
See Fig. 2 and Fig. 9, this utility model provides the multiple PF mechanism 5 realizing function described in embodiment two, unlike previous embodiment, although chip body 1 includes chip upper slice 11 and chip bottom sheet 12, but for mounting means, PF mechanism 5 may be configured as dismountable PF mechanism or modular PF mechanism, wherein, as in figure 2 it is shown, dismountable PF mechanism is removably connected in chip body 1, and in chip body, it is provided with joint 13；Also can be as it is shown in figure 9, integrated setting be in chip body in the way of modular PF mechanism.
For structure, PF mechanism may be configured as multiple, such as existing syringe, liquid-transfering gun etc., every PF mechanism being capable of the PF of PF intracavity pushes to liquid storage cylinder under pressure, all should fall into protection domain of the present utility model；For syringe and liquid-transfering gun, it is both needed to arrange joint in chip body to connect, simultaneously because need an independent hand propelled during operation or press pressure handle, thus needs two handss to operate the use that can complete chip simultaneously, have inconvenience more.To this, PF mechanism 5 can be set to the flat shaped body matched with chip thickness, including pedestal 501, being provided with piston hole 502 on pedestal 501, piston hole 502 can be arranged on the end face of pedestal 501, it is possible to is arranged on the side of pedestal 501, pedestal 501 is internally provided with propelling sap cavity 503, propulsion unit is piston block 504, and piston block 504 slides in piston hole 502 relatively, and the inwall of piston hole 502 is provided with the locating part for limiting piston block monodisplacement.It should be noted that, the PF mechanism of this structure, could be arranged to dismountable PF mechanism, it is possible to be set to modular PF mechanism.If modular PF mechanism, can be as it is shown in figure 9, fluting be for advancing sap cavity 503 on sheet 12 under the die, on chip upper slice, perforate is piston hole 502, then chip upper slice 11 is sealed with chip bottom sheet 12 phase, then a piston block closed with piston hole 502 matching size is set.It addition, it should be noted that, advancing and gradually rise bottom the liquid outlet of sap cavity 503, until flushing bottom the capillary channel being opened in chip bottom sheet, going out liquid with meet PF.
Should be noted that; every it is capable of piston block 504 locating part of monodisplacement in piston hole; protection domain of the present utility model all should be fallen into; relatively simple; locating part is a plurality of helical teeth being disposed side by side on piston hole inwall; it is provided with the tooth engaged being meshed with helical teeth on the outer wall of piston block, by the tooth engaged interlocking to helical teeth, prevents the reverse displacement of piston block；The effect of piston block 504 monodisplacement is to make the quantitative blood plasma in liquid storage cylinder to discharge, without by the blood plasma sucking-off in collector unit.
Embodiment seven
See Figure 10 and 11, this utility model provides the multiple liquid outlet mechanism 7 realizing function described in embodiment two, identical with previous embodiment three to six is, chip body 1 includes chip upper slice 11 and chip bottom sheet 12, liquid outlet mechanism 7 is arranged in chip bottom sheet 12, and chip upper slice 11 plays the effect of sealing.Liquid outlet mechanism 7 includes that liquid outlet 701, the inner side of liquid outlet 701 are provided with attachment structure 702, and attachment structure is draw-in groove, female thread or projection, is mutually matched with the connector on other chip to facilitate, it is achieved position is fixed.Or, liquid outlet mechanism also includes that jointing 703, the connector that the size of jointing 703 is collected on container or other chip with EP pipe etc. are mutually matched, to realize the collection of blood plasma.
Embodiment eight
This utility model also provides for a kind of Whole Blood Filtration and the processing method quantitatively pipetting micro-fluidic chip, comprises the following steps:
S1 pretreatment: one piece of PMMA plate cutting is become 100mm*60mm, cut out two pieces standby；Use 3M 3701-3702 pure transparent double face glue, be attached to smooth for double faced adhesive tape on one of PMMA sheet material, the sheet material sticking double faced adhesive tape put on roller bearing press and repeatedly suppress twice, remove the bubble in double faced adhesive tape and PMMA sheet material.
S2 chip manufacture: use CO2 laser machine that pretreated PMMA sheet material is processed.
Pretreated PMMA sheet material double face glue surface is upwards snapped in laser machined die groove；Needs graphics processing being edited in Laser Processing software, adjusting laser power is that 8W is processed；Reprocessabilty 10 times, takes off after molding to be processed；The most pretreated for another sheet PMMA sheet material is snapped in laser machined die groove；Needs graphics processing being edited in Laser Processing software, adjusting laser power is that 8W is processed；Reprocessabilty 10 times, takes off after molding to be processed；
S3 chip assembles: is cut into appropriately sized by whole blood filter membrane and glass fibre, is sequentially loaded in whole blood separating mechanism；Tearing the overlay film on double faced adhesive tape off, after the chip fluctuating plate alignment that will process, runner direction is adhered to instrument inwardly, puts into and repeatedly suppresses twice on roller bearing press, removes the bubble in double faced adhesive tape and PMMA sheet material；Check and be bonded whether chip has blocking or gas leakage, PF is sucked push structure, push structure liquid outlet and the correspondence position tubule of chip assembled are connected, then with buckle, push structure is fixed, make total become an entirety.
Embodiment nine
This utility model also provides for using different materials and method prepare Whole Blood Filtration and quantitatively pipette the comparing result of micro-fluidic chip, as follows:
It is respectively adopted PMMA material, glass material, PS material making chip, every kind of chip prepares 5 pieces, and wherein, the mode of PMMA materials'use Laser Processing is processed into desired structure, glass material uses the mode of photoetching to form desired structure, and the mode of PS materials'use injection forms desired structure.The processing of PMMA materials'use hot glue is bonded, and glass material uses double faced adhesive tape to be bonded, and PS materials'use hot glue and pressure sensitive adhesive combine glued membrane and be bonded.After being bonded, the chip that three different being connected syringe, it is 20ul that the design of three kinds of chips quantitatively pipettes capacity, and design sample-adding amount is 100ul.
Before bonding completes, use the diethyl ether solution of lithium aluminium hydride reduction to join and PMMA material passage is passivated process.After Passivation Treatment completes, PMMA material chip is bonded.
When using chip, being added separately to by whole blood sample in the inlet of three chip blocks, when serum flows to before the micro-valve of choked flow, the blood plasma in three kinds of chips all stopped the capillary flow along duct orientation.Promote the propulsion unit of PF mechanism, PF is pushed in the liquid storage cylinder of liquid quantitative mechanism, promote serum specimen to move forward.Now, the serum specimen in three chip blocks all flows in the micro-valve of choked flow, and passes therethrough, and flows out from liquid outlet.
Treat that Specimen liquid flows out completely from chip, collect in EP pipe respectively, measure the liquid volume that three kinds of different chips are collected.Result is as shown in table 1, according to the meansigma methods of quality difference, it is seen that three kinds of chips are respectively provided with and preferably quantitatively pipette effect, are scaled Plasma volumes, meets design and quantitatively pipettes capacity 20ul.
1 three kinds of chips of table quantitatively pipette Contrast on effect result
It addition, this utility model also makes a collection of PMMA micro-fluidic chip, it is 20ul that its design quantitatively pipettes capacity, and design sample-adding amount is 100ul.Use clinic to obtain health examination blood to test.Taking 100ul from different specimens and join in well, result is as shown in table 2, according to the meansigma methods of quality difference, visible PMMA micro-fluidic chip is respectively provided with and preferably quantitatively pipettes effect, life-time service stability is higher, is scaled Plasma volumes, meets design and quantitatively pipettes capacity 20ul.
Table 2 PMMA micro-fluidic chip life-time service quantitatively pipette Contrast on effect result
The above is only preferred implementation of the present utility model; it is not limited to this utility model; should be understood that; for those skilled in the art; on the premise of without departing from this utility model know-why; can also make some improvement and modification, these improve and modification also should be regarded as protection domain of the present utility model.
Claims (7)
1. the micro-valve of choked flow, it is characterised in that: include stream control chamber and be respectively communicated with at stream control chamber liquid feeding side
With lead channel and the liquid outlet groove of tapping side, the internal diameter of described stream control chamber liquid feeding side is more than the internal diameter of lead channel, institute
The internal diameter stating stream control chamber is gradually reduced along liquid feeding side to tapping side direction.
The micro-valve of choked flow the most according to claim 1, it is characterised in that: the end of described stream control chamber liquid feeding side
Face height is less than the floor height of described lead channel, the internal diameter of described stream control chamber tapping side and the internal diameter of liquid outlet groove
Consistent.
The micro-valve of choked flow the most according to claim 2, it is characterised in that: described stream control chamber includes position respectively
In liquid feeding side and tapping side and the front cavity that is interconnected and rear chamber, described front cavity is cubic type,
The internal diameter of described rear chamber is gradually reduced along liquid feeding side to tapping side direction.
The micro-valve of choked flow the most according to claim 3, it is characterised in that: described lead channel, front cavity,
The end face of rear chamber and liquid outlet groove is generally aligned in the same plane, and the bottom of described rear chamber is along liquid feeding side to tapping side side
To gradually rising, the width of described rear chamber tapers into along liquid feeding side to tapping side direction.
The micro-valve of choked flow the most according to claim 4, it is characterised in that: the degree of depth of described front cavity is
650-750 μm, width is 950-1050 μm.
The micro-valve of choked flow the most according to claim 4, it is characterised in that: described lead channel and liquid outlet groove
The degree of depth is 250-350 μm, and width is 250-350 μm.
7. one kind uses according to the Whole Blood Filtration of the micro-valve of choked flow described in any one of claim 1 to 6 and quantitatively
Pipette micro-fluidic chip, it is characterised in that: include chip body and the whole blood being arranged in chip body
Separating mechanism, the micro-valve of anti-backflow, liquid quantitative mechanism, PF mechanism, the micro-valve of choked flow and liquid outlet mechanism；
Wherein:
Described whole blood separating mechanism includes inlet, whole blood filter membrane and the collector unit set gradually, described entirely
Blood filter membrane is for the blood filtration isolated blood plasma that will enter from inlet, and described collector unit is used for collecting
Blood plasma is also sent to liquid quantitative mechanism through the micro-valve of anti-backflow by the blood plasma of isolated under capillary action；
The micro-valve of described anti-backflow is for stoping the blood plasma adverse current in liquid quantitative mechanism to whole blood separating mechanism；
Described liquid quantitative mechanism includes the liquid storage cylinder for housing quantitative blood plasma；
The micro-valve of described choked flow is arranged on the outfan of liquid quantitative mechanism and for stoping the blood plasma in liquid storage cylinder
Flow out in the case of without ambient pressure；
Described PF mechanism includes the propelling sap cavity for housing PF and propulsion unit, described propelling list
Unit is for pushing to liquid storage cylinder under pressure and by determining in liquid storage cylinder by the PF of PF intracavity
Amount blood plasma pushes to liquid outlet mechanism through the micro-valve of choked flow；
Described liquid outlet mechanism includes liquid outlet, described liquid outlet blood plasma after discharging Quantitative Separation.
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| CN201620267293.4U CN205517818U (en) | 2016-03-31 | 2016-03-31 | Little valve of choked flow |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106902904A (en) * | 2017-04-01 | 2017-06-30 | 苏州岚轩生物科技有限公司 | For the liquid control valve door gear and its micro-fluidic chip of micro-fluidic chip |
| CN106902905A (en) * | 2017-04-01 | 2017-06-30 | 苏州岚轩生物科技有限公司 | Back-flow preventer and its micro-fluidic chip are controlled for micro-fluidic chip liquid |
| CN112452362A (en) * | 2020-09-25 | 2021-03-09 | 中山大学 | Pump-free fixed zebra fish microfluidic chip system and preparation method and application thereof |
-
2016
- 2016-03-31 CN CN201620267293.4U patent/CN205517818U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106902904A (en) * | 2017-04-01 | 2017-06-30 | 苏州岚轩生物科技有限公司 | For the liquid control valve door gear and its micro-fluidic chip of micro-fluidic chip |
| CN106902905A (en) * | 2017-04-01 | 2017-06-30 | 苏州岚轩生物科技有限公司 | Back-flow preventer and its micro-fluidic chip are controlled for micro-fluidic chip liquid |
| CN106902904B (en) * | 2017-04-01 | 2018-07-03 | 南京岚煜生物科技有限公司 | For the liquid control valve door gear and its micro-fluidic chip of micro-fluidic chip |
| CN112452362A (en) * | 2020-09-25 | 2021-03-09 | 中山大学 | Pump-free fixed zebra fish microfluidic chip system and preparation method and application thereof |
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