Background technology
The micro-fluidic AIDS diagnosis technical background of associated multi-channel, it is special to may refer to the grade inventions of CN 200910151219.0Sharp application case.
Only for the microflow control technique overall general picture of itself, famous micro-fluidic expert Mr. Lin Ping Cheng may refer to notThe monograph " diagram Microfluid based Lab on a chip " gone out before long, the monograph is published via Science Press, and the monograph is to micro-fluidicPast of technology, now, and, vision of the future etc. etc., suffer from detail, be deep into long discussion of detail.
So, the Important Problems of this case that to have a talk below concern.
The basic framework of micro-fluidic chip, including it is etched with the substrate of conduit and the cover plate to fit together therewith, instituteState the fluid course on substrate, before upper cover plate is assembled, it is apparent on see to be exactly some conduits, wait until lid is covered thereonAfter piece, just really closure forms the fluid course, and the conduit inner surface of the conduit is together with the part that surround the conduitCover plate forms described fluid course together；So, it is clear that assemble the fluid course after completing, its inner surface faceLong-pending major part is the inner surface area of that conduit, and in other words, the state or property of the conduit inner surface are substantially determinedThe integrality or property of the fluid course are determined；Therefore say, the inner surface state or interior of this conduit of the structure on substrateSurface nature is key factor；In principle, any material that can be kept or keep its solid forms substantially, can be usedTo make substrate and cover plate, such as, the material that can act as substrate and cover plate can be monocrystalline silicon piece, quartz plate, sheet glass, heightPolymers such as dimethyl silicone polymer, polymethyl methacrylate, makrolon etc.；Certainly, the selection of substrate and the choosing of cover plateMaterial be able to can also be differed with identical；From the point of view of material consumption, manufacture difficulty and application popularization prospect etc. etc., theseNot small difference, the especially selection of that substrate between material be present, have a great influence.
In various substrate making materials, dimethyl silicone polymer, i.e. PDMS, comparatively very easily shaping, at thisIt is extremely simple that conduit is made on the substrate of sample, and the lower cost for material, substrate is made with the polydimethyl siloxane material,Conduit is being suppressed or etched thereon, and is being engaged with the cover plate that the cheap material such as glass or polypropylene or other plastic sheets makes,It is a kind of more satisfactory selection seemingly；Certainly, patch material can also select to use cheap polydimethyl siloxane material：So, this substrate selection is the scheme of polydimethyl siloxane material, and material is extremely cheap, and making is extremely simple, seems and should also be asIt is extremely easy to popularize, promotes.
But thing is really not so simple.
First, this polydimethyl siloxane material, that is, the material that alphabetical PDMS is referred to of abridging, itself are a kind of strongStrong hydrophobic material, conduit is built on this material, if without being operated for the modified of the conduit surface, then, it is wholeAfter body assembling is completed, that is, after covering cover plate, because the conduit its inner surface in structure occupies most fluid courseInner surface, then, its strong hydrophobic property of the PDMS conduits inner surface, is deciding factor, it can be similar to waterThe fine liquid stream of polar liquid of solution by becoming very difficult, its flow resistance is big, or even in general Micropump is all difficult toPromote, certainly, if cover plate also selects to use the PDMS material, then, problem is substantially identical, similar；Therefore, existingAmong having technology, modification is modified particular for the conduit inner surface on the PDMS material, is necessary operation；So, thisThe individual modified operation for PDMS conduit inner surfaces is pretty troublesomeThat falls nor this problem, forms serious technical puzzlement,It is another problem：PDMS polymer molecules inside its body phase of this PDMS material substrate have to be diffused to the surface, moves automaticallyThe characteristic of shifting, the characteristic that this substrate body phase inside PDMS polymer molecules are diffused to the surface, migrated automatically, will cause by tableState after the modification of its inner surface of that conduit of face modifying and decorating can not maintain the sufficiently long time, and that is through surfaceHolding time for conduit its inner surface state after modification is substantially only sufficient to the time needs for completing laboratory internal test experiments；In other words, by surface is modified or the PDMS conduit inner surfaces of surface modification, after it is modified or institute's shape after modification is saidInto surface state can not be lasting, but soon automatically tend to or say become again surface be modified before surface state, compared withThe strong hydrophobic surface state of that script is returned in the short time, then, just think, such micro-fluidic chip can be bigAmount making, mass storage, it is widely popularized, answer is it is obvious that is, impossible.Conduit on this PDMS material, does not doIf surface modification, it can not pump and pass through similar to the fine liquid stream of polar solvent of the aqueous solution, chip also cannot just use；And such asFruit has been cooked surface modification, can not persistently keep its state after modifying again, or equally can not popularization and application.
According to the literature, there is a kind of expedient solution, be that a small amount of surface-active is added in sample to be tested solutionAgent, so as to which during test, dynamic, temporary transient effective surface hydrophilic layer is built temporarily in the PDMS conduits inner surface；However, due to the amphipathic characteristic of surfactant, the introduced surfactant of the program is inevitable simultaneously also can be with sample solutionIn tested composition occur combination so that tested composition can not be detected normally or it is detected ratio and dubiously droppedIt is low；The surfactant is possibly even fully wrapped around by tested composition with micelle form so that tested composition can not be detected orIdentification；Therefore, this kind adds the scheme of surfactant into sample solution, is far from a preferable solution.
So, how to accomplish that substrate can either be made using cheap PDMS material, and the conduit can be releasedInner surface decorating state can not persistently, chip can not largely make, largely lay in and then be widely popularized and such a make this areaThe puzzlement that numerous professionals are entangled with for a long time, the highly difficult problem that exactly one its obvious technology barrier can not despise.
Be present many year in the highly difficult problem, so far, not yet properly settled.
Second, the PDMS material of non-surface modification, it is stated that, its surface is strongly hydrophobic above, this strong hydrophobicMaterial surface and also have another problem, that is, this strong hydrophobic PDMS surfaces can adsorb large biological molecule, andAnd these adsorbed large biological molecules can also further depression further on PDMS surfaces, gradually fall into it is gradually deep, untilIt is heavy to be trapped within the body phase of PDMS substrates, in fact, this process, partly it is also due to PDMS material body phase interior polymerMolecule, which has, to be diffused to the surface, caused by travel motion；Such case, it can also be explained from another angle, i.e. continue notDisconnectedly from inside PDMS body phases to those polymer molecules of its diffusion into the surface, migration, its result moved, be little by little by thatIt has been involved in a bit by the large biological molecule of adsorption within the body phase of PDMS substrates, briefly, these adsorbed biologiesMacromolecular is exactly to be swallowed up by PDMS substrate body phases；So, this PDMS substrates body phase swallows up the phenomenon of large biological molecule, its instituteCaused by influence, necessarily cause the severe deviations of all kinds of test data of experiment for being related to large biological molecule.
As described above, the problem of PDMS substrates, is, its not only adsorption large biological molecule, and swallow up biological big pointSon, so, as the large biological molecule of experiment test object, its disappearance will not stop because surface saturation is adsorbed, andIt is, it is constantly adsorbed, also constantly swallowed up.
On PDMS substrates, its body phase is constantly swallowed up and tests showing for associated biomolecule macromolecular in related experiment test processAs, it is to say that another kind, which is explained, substantial amounts of Minute pores in PDMS body phases be present, associated biomolecule macromolecular by after adsorption,Depression enters these Minute pores, and then is swallowed up；However, inventor thinks, those can allow the sky of miniature scaleQi leel squeezes into the Minute pores therebetween, not equal to saying that they also can directly allow the large biological molecule of relative large scale to enterEnter, both difference on yardstick are huge, must not make sweeping generalizations.Explanation is bypassed, in any case, as dependence test analysis objectLarge biological molecule is adsorbed by PDMS substrate conduits inner surface, and then is constantly swallowed up by PDMS substrate body phases, and this is known objectiveExisting phenomenon.
, can be from containment PDMS surfaces pair in order to prevent swallow up effect of this PDMS substrate bodies relative to large biological moleculeThe absorption of large biological molecule addresses, and method is chemically modified modification aiming at the PDMS material surface, forFor PDMS is the situation of substrate material, modification exactly is chemically modified to the surface of described channel portion, by chemistryThe conduit inner surface of modification, can contain its absorption to large biological molecule, and then avoid large biological molecule quiltPDMS substrate body phases are swallowed up；But or that old problem, that is, the chemical modification on PDMS material surface is modified itSurface state afterwards can not persistently be kept, the polymer molecule inside the PDMS substrate body phases its diffuse to the surface, migrate automaticallyProcess, can soon by that by surface chemical modification be modified conduit inner surface state become again script it is strong it is hydrophobic simultaneouslyAnd the state of strong adsorption large biological molecule, in other words, no matter how professionals in the field turn from side to side, the PDMS substrates itsConduit inner surface is always rapidly to strong hydrophobic surface state evolution.
So, how can either obtain that PDMS material price is extremely cheap, substrate makes extremely easy benefit, and can is enoughReach and contain the absorption process of the PDMS substrate conduit inner surfaces to large biological molecule for a long time, and then prevent PDMS substrate bodies relativeThe effect of swallowing up of large biological molecule so that related chip manufactured goods are able to maintain that a prolonged enough, rational shelf-life,It is exactly a very intractable problem.The problem equally makes this area numerous specially as another problem addressed aboveIndustry personnel are entangled with, perplexed for a long time, and the problem is equally the highly difficult problem that its obvious technology barrier can not despise.ShouldAlso be present many year in problem, so far, also not yet properly settled.
Third, the polydimethyl siloxane material, namely PDMS material, the active force very little wherein between polymer molecule,The polymer molecule of low polymerization degree inside its body phase is in constantly into the dynamic process of surface migration, therefore, includes PDMSAfter it has been formed, the surface topography in its inner-walls of duct face of chip can be because of described low polymerization degree polymer point for the chip of substrate materialSon moves about, pours into the surface and change, and the change of its pattern is somewhat similarly to Rheological Deformation, trickling deformation or creep and becomePattern caused by shape institute is possible changes；In the higher PDMS material of some low polymerization degree component ratios, this kind somewhat similarCan be showed in the phenomenon of Rheological Deformation, trickling deformation or the deformation of creep must be than more significant；This kind include PDMS substrates chip itsThe dynamic of inner-walls of duct surface topography after shaping changes property, namely the described property or stream that are somewhat similarly to Rheological DeformationDropping down the property of deformation or the property of the deformation of creep, the word of rheology one is applied mechanically in this case, integration, also referred to as the rheological equationm of state or rheology becomeShape property, the dynamic of corresponding inner-walls of duct face pattern change, and this case is also referred to as rheology；As described above, because of this kind of materialExpect certain Rheological Deformation property as described above that its own has, its manufactured goods actually can at leisure Rheological Deformation and causeThe manufactured goods total form generation changes；Influence caused by its Rheological Deformation property, it is to be not easy to feel in terms of macroscopic perspectiveExamine, still, for the very fine micro-fluidic chip of its internal structure, the rheological equationm of state can but cause bigger shadowRing, the fluid course namely the pipeline therefore, during pre-production formed, because the wall of its tube chamber of pipeline is mainIt is the wall of PDMS materials, so, the cross-sectional area of the pipeline actually can gradually become because of rheology over timeIt is small, stated differently, since the reason for the rheology, the natively finer pipeline that is flowed through for liquid sampleIts tube chamber the more can become the more narrow, in the case of flow time is sufficiently long, or even the pipeline tube chamber can partly close or allGround closes, and then make it that sample fluid course is thoroughly blocked, and closes with being even also not reaching to its luminal part of pipelineThe degree closed or fully closed, its fluid passage that can be provided of that pipeline narrow because of rheology, then, in pipelineIts inner surface originally be exactly strongly it is hydrophobic in the case of, aqueous sample liquid is just more difficult to by becoming more so because of rheologyNarrow micro-channel, then, the influence of substrate rheology how is resisted, maintains the basic framework of the pipeline not occur seriously to become for a long timeThe problem of shape, also, keep the long-term unobstructed of the pipeline is exactly a urgent need to resolve.
The content of the invention
The technical problem to be solved by the invention is to provide a package solution, solves totally aboveA series of problems addressed, also, the solution is applied to AIDS diagnosis multichannel micro-fluidic chip field, formedA kind of new AIDS diagnosis Multichannel device.
The present invention solves the technical problem by following scheme, and the device that the program provides is a kind of driving liquid stream structurePart is easy to the AIDS diagnosis device of removal, and the structure of the device includes multichannel micro-fluidic chip, the micro-fluidic chipStructure includes being bonded to each other installing substrate and cover plate together, and the substrate and cover plate are plate object or tablet, the baseThat face towards the cover plate of piece contain via mould pressing process or etching technics formation channel structure, the substrate also contain withThe channel structure is connected and pierces the window knot formed via mould pressing process, etching technics or simple drilling technology of the substrateStructure, it is bonded to each other the substrate being installed together and has been built into jointly containing pipeline configuration and the liquid being attached thereto with the cover plateThe micro-fluidic chip of pool structure, the locations of structures of the pipeline are located at the interface zone that the substrate is bonded to each other with the cover plate, the windowIts side of mouth is blocked by the cover plate and opposite side opens, and the locations of structures of the window is exactly the locations of structures of the liquid pool, describedThe quantity of liquid pool is three, and its locations of structures of two liquid pools therein is located at the sample introduction end of the micro-fluidic chip, remaining oneIts locations of structures of liquid pool is located at the terminal of liquid flowing in its chip when the actual sample introduction of the micro-fluidic chip is tested, and the terminal is with being somebody's turn to doSample introduction end is located remotely from each other, one end of the pipeline via be similarly positioned in the manifold shape turnout of the interface zone being bonded to each other respectively withThe Liang Ge liquid pools UNICOM positioned at sample introduction end, the other end of the pipeline and the remainder of the terminal positioned at the micro-fluidic chipA liquid pool UNICOM, and, the working electrode that is sequentially respectively installed in the pipeline on diverse location and to electrode andReference electrode, the working electrode is by conductive electrode and is attached on the conductive electrode and has embedded AIDS disease-specificThe gold size sensitive membrane of antigen is formed, and the construction of the pipeline is in parallel construction, and the pipeline in parallel construction is by four branched pipesRoad is in parallel to be formed, and the quantity of the working electrode is four, and the installation position of four working electrodes is located at described four respectivelyIn lateral, and, the specific antigen in its top layer gold size sensitivity membrane structure of four working electrodes is to AIDS respectivelyFour kinds of AIDS antigenic substances that sick antibody can be specifically bound, four kinds of antigenic substances are AIDS specific antigen respectivelyP24, gp41, gp120 and gp36, its material of the working electrode is gold material or thermally decomposes conducting polymer material, describedSheet or thread is presented in working electrode its pattern, and emphasis is, its material of the substrate is dimethyl silicone polymer material, the substrate itsSurface is the surface of primary form, the surface of the primary form its be intended to refer to not by any surface chemical modification or appointThe surface of the primary form of the material of what surface chemical modification, the structure of the device also include elastic clip, and the two of the elastic clipIndividual opposite clamping limb snap-in location is in the position of the neighbouring terminal of the micro-fluidic chip, described in one at least inFixation is attached on clamping limb and is equiped with miniature ultrasonic transducer units, and, higher-order of oscillation electric signal transmission cable, the higher-order of oscillationOne end of electric signal transmission cable links together with the miniature ultrasonic transducer units；The elastic clip provides one and facilitates the dressPut the function of disassembling；Its major function of the miniature ultrasonic transducer units is in the actual sample introduction test of micro-fluidic chip, utilizes instituteState the distance between sample introduction end and the terminal and miniature ultrasonic transducer units installation position difference and it is experiencedUltrasonic intensity on difference, the difference between its interfacial tension of sample introduction end described in induced synthesis and the terminal its interfacial tensionDifferent, the interfacial tension difference between the micro-fluidic chip both ends can form pressure differential between the both ends of the micro-fluidic chipDifferent, the pressure gap can drive sample solution to the end flow；The dimethyl silicone polymer material that is soft and having elasticitySubstrate its function include, with its property to the strong absorption of ultrasonic wave, absorbing ultrasonic wave strongly, it is and thereby micro- at thisThe fluidic chip terminal is to the rapid decrement that ultrasonic intensity is realized within the limited short distance between the sample introduction end；AndMany silica dioxide granules, many silica dioxide granules are filled in the pipeline, and its tube chamber of the pipeline is permitted by thisMore silica dioxide granules are filled up, and its particle size range of the silica dioxide granule is between 10 microns and 200 microns, the dioxySilicon carbide particle is that silica crystalline particles, silica glass granule or silica composition its shared percentage by weight existsMore than 80% inorganic glass particles.
Its particle diameter of the silica dioxide granule can be that the basis between 10 microns and 200 microns is actually needed and anyThe particle diameter specified, such as 10 microns, 30 microns, 70 microns, 100 microns, 150 microns or 200 microns of the particle diameter, etc..
The scope of further preferred its particle diameter of the silica dioxide granule is between 100 microns and 200 microns.
Its pattern of the silica dioxide granule is unlimited, and the silica dioxide granule for example can be spheric granules, rod-shaped particles, lengthCube shape particle or any amorphous granular.
The various silica dioxide granules manufacturing technology of itself is known technology.
Various forms, the silica dioxide granule market of all size are on sale.
The silica dioxide granule can also customize to specialized factory.
The preferred scope of its internal diameter of pipeline is between 500 microns and 1000 microns；It is but excellent compared to above-mentionedThe internal diameter of the pipeline scope of choosing, more tiny internal diameter of the pipeline or thicker internal diameter of the pipeline are also what this case was allowed.
Described miniature ultrasonic transducer units can certainly be all installed on the elastic clip two clamping limb；ButOnly one miniature ultrasonic transducer units of installing are dealt with enough uses.
The word of elastic clip one art-recognized meanings of itself are known.
The gold size sensitive membrane is to be sufficiently mixed chitosan gold size solution and AIDS specific antigen solution uniformly, is usedPoint sample instrument point sample is coated on specified structure position, and forms its drying and forming-film.AIDS in the gold size sensitive membrane is specialSpecific Antigen is the AIDS antigen of horseradish peroxidase or glucose oxidase mark, and the gold size sensitive membrane has been wrappedContaining complementary medium therein is introduced for the above-mentioned each AIDS specific antigen of fixation, the complementary medium such as shell gathersSugar, cellulose acetate, gelatin be therein a kind of or their mixture.
The pipeline and the lateral and the manifold shape turnout in the microfluidic chip structure, in itFootpath size may each be arbitrarily selected size, still, for as far as possible less with prepare liquid sample and reduction reagent loss etc.Consideration, the pipeline and the lateral and the manifold shape turnout preferably select capillary level passage, instituteThe passage for stating capillary level implies that its internal diameter passage suitable with the internal diameter of the capillary on ordinary meaning.The capillary is in itThe shape of cross section of portion's passage can be arbitrary shape, and the shape of cross section is for example circular, oval, square, rectangle, barShape, naturally it is also possible to it is the linear of bending arbitrarily be present, also, the interior shape of the capillary is with the extension of pipeline,The shape of cross section of different parts can also allow to be different shapes.Only for the word of capillary one, its art-recognized meanings is publicKnow.
What is be related in structure is the electrode of microsize to electrode and reference electrode, and its electrode shape, which may each be, appointsThe selected shape of meaning, the arbitrarily selected shape such as square piece shape, rectangular patch, strip or round sheet etc..It is describedArt-recognized meanings to electrode and the reference electrode vocabulary of itself are known.
It is related to several liquid pools in this case microfluidic chip structure, the liquid pool is the pond shape or capsule for transitional liquid storageShape constructs, and its shape of the inner chamber of each liquid pool may each be arbitrarily selected shape, and the cavity shape is for example roundCylindrical cavity shape, square column type cavity-like, oblong cavity shape or spherical hollow space shape etc..The size of the liquid pool can be anySelected size, still, in order to as far as possible less with prepare liquid sample and reduce reagent loss, the liquid pool be preferably capable of withThe liquid pool of the microminiature of capillary matching.
Only for professional of the word of ultrasonic transducer one art-recognized meanings of itself for ultrasonic technology field,It is known.
Various sizes, variously-shaped ultrasonic transducer are commercially available；Its size of commercially available miniature ultrasonic transducer unitsIt may diminish to the magnitude only calculated with millimeter.
Only with regard to miniature ultrasonic transducer units its technique for fixing on general industry application solid body surface itsIt is known general technology for the professional in ultrasonic technology field for body.This case is not to this expansion superfluous words.
Only with regard to naked PDMS substrates itself conduit molding or lithographic technique for, be open-and-shut known technology；Similarly, the technology of hole-opening is even more known simple technique on naked PDMS substrates.This case is not also to this expansion superfluous words.
The industrial products market of involved its all size of higher-order of oscillation electric signal transmission cable is on sale.
The structure of the device can also include higher-order of oscillation electric signal generator；The higher-order of oscillation electric signal transmission cableIts other end can be connected with the higher-order of oscillation electric signal generator.
The involved higher-order of oscillation electric signal generator technology of itself, come for the professional in ultrasonic technology fieldSay, be simple and known；The higher-order of oscillation electric signal generator can customize to ultrasonic instrument specialized factory.
The preferred scope of its specified ultrasonic wave transmission power of the miniature ultrasonic transducer units is between 5 milliwatts and 5000 milliwattsBetween；The preferred scope of the frequency of its ultrasonic wave operationally launched of the miniature ultrasonic transducer units be between 100KHz withBetween 12MHz.
This case device can further include some annexes certainly, and the annex is such as multiple tracks electrochemical workstationDeng the art-recognized meanings of the multiple tracks electrochemical workstation are known.The each work being related in this case microfluidic chip structureElectrode and to electrode and reference electrode etc., special it can get lines crossed and the multiple tracks electrochemical workstation via corresponding respectivelyThe corresponding interface coupled.It is described that special to get lines crossed be for by each phase of each electrode and the multiple tracks electrochemical workstationAnswer the private cable that interface is coupled to each other.The micro-fluidic chip in this case device, its structure can also include micro-valve,The quantity of the micro-valve is unlimited, and according to being actually needed, the micro-valve can be installed in any need in the microfluidic chip structurePosition to be mounted；The word of micro-valve one is for the professional of micro fluidic chip technical field, the art-recognized meanings of itselfIt is known；The micro-valve itself manufacturing technology and the use of technology is also known；The component that the micro-valve is not required.
The diameter of the working electrode can allow to be that any setting is easily installed the suitable diameter used, still,It is recommending or say preferable its scope of the diameter between 0.1 micron to 2000 microns；The length of the working electrode canTo allow to be that any setting is easily installed the length used, it is however recommended to or to say the preferable length its scope be 1Micron is between 15000 microns.
It is installed in by spraying or point sample instrument point sample or the coating of other appropriate process described in the working electrode surface layerGold size sensitive membrane, its thicknesses of layers can allow be any setting treat sample measuring liquid occur electrical signals response thickness,It is however recommended to thickness preferable thickness is between 10 nanometers and 200 nanometers in other words.
The cover plate in chip structure, its material can allow to be any electrical insulating property material, such as：Polypropylene,Glass, polymethyl methacrylate, dimethyl silicone polymer, etc., in order to make smaller size of micro-fluidic chip, for example doInto the micro-fluidic chip of only 2.0 centimetres to 3.0 centimetres of super-small of length, and realized in the extremely short distance to ultrasonic waveExtremely fast decay, can preferably dimethyl silicone polymer be used as cover plate.Certainly, selected on large-sized micro-fluidic chipUsing dimethyl silicone polymer it is used as the cover plate, and this case technical scheme is allowed.
Positioned at the sample introduction end of the micro-fluidic chip two liquid pools its with positioned at the micro-fluidic chip terminal shouldAir line distance between a remaining liquid pool can be arbitrarily selected suitable distance, still, the distance as neededPreferred value is between 3 centimetres and 7 centimetres.
Described its thickness of cover plate and substrate can allow be any setting the thickness for being easy to assembling, the thickness of recommendation or sayPreferable thickness is between 1.0 millimeters and 5.0 millimeters.Less thickness is advantageous to save material.
The micropore fluorubber is commercially available.
The word of elastic clip one art-recognized meanings of itself are known.
Various elastic clip market is all on sale.
The application method of this case micro-fluidic chip：
Itd is proposed first based on this case and the first public new liquid stream driving principle, its application of this case micro-fluidic chip are transportedAmong work, the new liquid stream driving method is determined completely without involving any additional Micropump.
The interfacial tension difference that this case is formed between micro-fluidic chip both ends caused by the ultrasonic wave,Driving liquid stream flows in the capillary channel of the four-way micro-fluidic chip, right respectively using four-way electrochemical analytical instrumentFour kinds of aids antibodies are detected.
Corresponding four kinds of aids antibodies are detected with four kinds of AIDS antigens, with detecting phase with four kinds of aids antibodiesThe four kinds of AIDS antigens answered, similarly, can diagnosis of aids；The principle of its foundation is, must in AIDS patientIt is so antigen, antibody and deposits, and mutual Reversible binding, form reversible conjugate, therefore, antibody and thereby is detected with antigenDiagnosis of aids, with being gone to detect antigen and diagnosis of aids with antibody, diagnostic purpose can be reached.Certainly, different meansIts corresponding electrode sensitive decorative layer technically and differs.
The specific detection of this case micro-fluidic chip is as follows using step：
1st, blood serum sample liquid is added in micro-pipe road, under ultrasonic wave driving, various aids antibody molecules are eachThe AIDS specific antigen for the corresponding horseradish peroxidase-labeled that gold size sensitive membrane embeds is caught on electrode surface in passageObtain.
2nd, the AIDS specific antigen of horseradish peroxidase-labeled is formed with the aids antibody in blood serum sample and exempted fromEpidemic disease compound.
3rd, using multi-channel electrochemical analyzer, the electron mediators such as catechol are added, it is above-mentioned using amperometric detectionCurent change caused by reaction, it is derived from the species and content of various analytes.
4th, result is subjected to comprehensive analysis, comprehensive diagnos is carried out to aids antibody.
It is an advantage of the invention that in elastic force described in the terminal of the micro-fluidic chip its close position snap-in locationPress from both sides, attached on the clamping limb of the elastic clip and miniature ultrasonic transducer units are installed, launch low work(with the miniature ultrasonic transducer unitsThe ultrasonic wave of rate, high-frequency band, meanwhile, using its strong absorbability to ultrasonic wave of dimethyl silicone polymer substrate, thanIn shorter distance, it is, in from the terminal to the very short distance of only several centimeters yardsticks the sample introduction end, reachInto the rapid decrement of ultrasonic intensity, the difference of the interfacial tension is thereby caused at the both ends of the micro-fluidic chip, is enteredAnd using the pressure gap between its both ends for being formed of the difference of the interfacial tension between the both ends, drive sample liquid streamFlowed in the pipeline to the terminal direction.By this case liquid stream drive scheme, altogether dispense with traditional micro-The equipment of pump etc；The micro-fluidic chip of Micropump is eliminated, its structure is more succinct, and its production process is less, and its cost of manufacture is moreLow, this kind of succinct structure is more beneficial for the low cost application for reaching micro-fluidic chip.
Its scheme of this case and by the pipeline except electrode installation take up space in addition to all clearance spaces wholeFilled up with the silica dioxide granule.Those are filled in the silica dioxide granule in pipeline, and this case is to its overall abbreviation titanium dioxideSilicon grain filler, its function include support, withstand the tube chamber of the pipeline its inwall so that the tube chamber of the pipeline is from because of instituteState rheology and narrow, prevent its reduced cross-sectional area of the tube chamber of the pipeline or even close, so as to maintain the base of the pipeline for a long timeSerious deformation does not occur for this framework.
Numerous silica dioxide granule entities are mutually banked up under this case framework together at random in the pipeline, the titanium dioxideThe function of silicon grain filler, also include certainly with the hydrophilic surface of its silica dioxide granule, utilize each adjacent titanium dioxideMutual formed complications are continuous and its inner surface that is mutually close together by water-wetted surface of silicon grain has hydrophilicThe space of property, in the hydrophilic fluid channel of the pipeline Inner Constitution network morphology, although this complications can be continuousAll the time the fluid channel with hydrophilic nmature, then, inside the tube chamber of the pipeline simultaneously and a plurality of miniflow depositedThe effect of its synthesis of road, integrated, cumulative superposition in other words, is the equal of the relatively fine hydrophilic capillary of caliberPassage；Its presence of the continuous hydrophilic fluid channel of the complications, the PDMS of the primary form is counteracted to a large extentThe flow resistance for liquid sample caused by the strong hydrophobic property in its surface of substrate；In other words, because of liquid sample, it is accounted forThe composition of maximum ratio is water, and liquid sample is substantially exactly the aqueous solution, therefore, the presence of the silica dioxide granule filler,Can significantly overcome with the unmodified PDMS substrates of hydrophobic property and surface its to the aqueous solution it is incompatible, repel andBarrier effect, so be greatly reduced belong to properties of Aqueous Solution sample liquid stream its be advanced through the resistance of pipeline.
Under this case framework, inside the tube chamber of the pipeline, the area of its lumen wall wall of former pipeline, because of described twoThe rigid of silicon oxide particle filler ties up, the table of part hydrophobic property that still can also be exposed on lumen wall wallIts area of face is already dramatically reduced, and the area on its still exposed part surface for belonging to hydrophobic property is muchLess than the wall surface area of the hydrophobic property of the lumen wall wall in the presence of no silica dioxide granule filler；So, under this case framework, in its lumen of the pipeline, its remaining hydrophobic surface increases surface newly with hydrophilic part, and it is foldedAdding, comprehensive, summation, cumulative technique effect, is to form the surface for tending to be hydrophilic on the whole；In other words, in instituteState inside the tube chamber of pipeline, its interfacial tension between sample solution of the part surface of remaining hydrophobic property, plus parentThe part of aqueous nature increases its interfacial tension between sample solution of surface newly, that it is superimposed, comprehensive, summation, cumulativeTechnique effect, be so that its solid-liquid interfacial tension inside the tube chamber of the pipeline synergy level off to capillary glass tube itsInterfacial tension between tube chamber inner surface and sample solution.
Therefore, exist in the pipeline under this case framework for having stated silica dioxide granule filler, while rely on thisCase sample liquid stream drive scheme, it becomes possible to the driving to sample liquid stream is reached with relatively low ultrasonic power, with this case mechanismThe test liquid is driven to flow to the end flow.
On the other hand, due to its rheological equationms of state of the PDMS as substrate material, it is filled in the pipelineThe interior silica dioxide granule filler, can gradually by constantly Rheological Deformation and to arest neighbors free space promote PDMSThe pipeline wall of material more tightly wraps up, and this process eventually causes those part two for pressing close to the lumen wall wallSilicon oxide particle is stuck in original place or is stuck in original place or embedding in-situ silica dioxide granule and its embedded in original place, the partIncarceration is together, described due to this reason each other for the remaining silica dioxide granule banked up with being mutually closely packed togetherSilica dioxide granule filler just will not move in the pipeline easily, silica dioxide granule therein be also substantially all byOriginal place is locked in, therefore the stream framework of the micro-fluidic chip can be kept for a long time.
The particle size range of its particle of this case silica dioxide granule filler between 10 microns and 200 microns, compared toFor general organic molecule, general large biological molecule, the particle diameter of its particle of this case silica dioxide granule filler can be rated as hugeGreatly, due to its huge particle diameter, and the inner surface of the surface of its polarity and the pipeline of strong hydrophobic PDMS materials can notMutually perhaps say and mutually melt, then, the huge silica dioxide granule of this kind of particle diameter can not be by the pipeline of PDMS materialsSurface is adsorbed, and can not more be swallowed up by the inner surface of the pipeline of PDMS materials, the huge titanium dioxide of this kind of particle diameterSilicon grain surely not be fully sunk in easily or sink to completely PDMS materials its among intrinsic many Minute pores, andBecause above it is stated that the rheology the reason for, the silica dioxide granule filler can be stuck in original place in other words it is embeddingIn original place without moving easily.
Inside the tube chamber of the pipeline, its lumen wall wall of former pipeline is entirely the surface of hydrophobic property originally, such asUpper described, under this case framework, rigid because of the silica dioxide granule filler ties up, on lumen wall wall still alsoIts area of the surface of part hydrophobic property that can be exposed is already dramatically reduced, and it is still exposed to belong to hydrophobicityThe area on the part surface of matter has been far smaller than the tube chamber in the presence of no silica dioxide granule fillerThe wall surface area of the hydrophobic property of inwall wall；The reason for because of the rheology, it is close to those dioxies of lumen wall wallSilicon carbide particle, little by little it is partially embedded into or is partly absorbed among the lumen wall wall, the dioxy among the stateSilicon carbide particle its towards the part surface of lumen wall wall with have occurred and that matching deformation the lumen wall wall it is tightClosely connected conjunction, then, the matching is deformed and closely pasted with silica particles having occurred and that in lumen wall wallThe part wall of conjunction actually can not contact with flowing through the sample solution of pipeline, that is to say, that the wall of this part isThrough suction-operated can not be produced to the large biological molecule therein that flows through the sample solution of pipeline and organic molecule.Based on above-mentionedMechanism, then because fill up the pipeline the silica dioxide granule filler its presence, its lumen wall wall of the pipelineThe overwhelming majority in face is tightly covered, and these described walls tightly covered can not be with flowing through the pipelineSample solution contact, only remaining fraction be not brought into close contact by its surface of silica dioxide granule, tightly coverHydrophobic surface may be contacted with sample solution, in other words, under this case framework, large biological molecule in sample solution and haveIts direct touch opportunity with hydrophobic PDMS walls of machine molecule is significantly reduced, thus, the lumen wall faces of PDMS materials itsThe adsorptive hindrance and interference of swallowing up of large biological molecule and organic molecule are greatly reduced；As described above, this case schemeBe advantageous to exclude or weaken the adsorptive hindrance and swallow up interference, be advantageous to be lifted the reliability of correlation analysis test data.
As described above, this case silica dioxide granule filler, its function actually includes being similar to being directed to PDMS materialsInner surface of pipeline carry out chemical modification effect, functioning as its this respect of this case is by the pipeline of the PDMS materialsSurface by the surface modification of hydrophobic property into the surface of hydrophilic nmature, still, with general, usual PDMS surface chemical modificationsIts hydrophilic chemical decorative layer retention time is short, hydrophilic effect can not keep situation prolonged enough different, particle described in this caseHuge silica dioxide granule filler, its particle being stuck by rheology can not both be moved easily, its huge particle diameterParticle can not more be swallowed up easily by the inner-walls of duct of PDMS materials, and therefore, its from this respect is similar to surface chemical modificationTechnique effect on see, its technique effect of this case, be form it is permanent, can not erase, can not consume, not be corroded, not byHydrophilic surface reforming layer swallowing up, being not dissolved, it is just comparable to one kind in its correlation table of PDMS base materials in effectThe permanent hydrophilic modifying superficial layer built on face.
It is related that the technical scheme of this case has dissolved its application to dimethyl silicone polymer substrate addressed above totallyA series of technical barriers.Based on this case scheme, the very cheap polydimethyl siloxane material of this kind is just possible to micro- at thisIt is prepared by fluidic chip, production, using etc. field play bigger effect.
The miniature ultrasonic transducer units have been installed in fixation on the elastic clip its clamping limb in this case structure, and the structure carriesA function of facilitating the device to disassemble is supplied, in this way, the elastic clip just can together with miniature ultrasonic transducer units appended thereonIt is enough to be easily mutually disengaged with the micro-fluidic chip, then, the component that the part can freely depart from just can circulate benignly it is heavyIt is multiple to use many times；The architectural feature is advantageous to save the use cost of the device.
Embodiment
In this case that Fig. 1 and Fig. 2 are shown embodiment, the structure of the device includes multichannel micro-fluidic chip, shouldThe structure of micro-fluidic chip includes being bonded to each other the substrate 19 and cover plate 20 of installing together, and the substrate 19 and cover plate 20 areWhat is formed via mould pressing process or etching technics contained in plate object or tablet, that face towards the cover plate 20 of the substrate 19Channel structure, the substrate 19 also containing be connected with the channel structure and pierce the substrate via mould pressing process, etching technicsOr the window structure that simple drilling technology is formed, it is bonded to each other the substrate 19 being installed together and is built into jointly with the cover plate 20Micro-fluidic chip containing pipeline configuration and the liquid pool structure being attached thereto, the liquid pool are liquid pool 1, liquid pool 2, liquid pool10, the locations of structures of the pipeline is located at the interface zone that the substrate 19 is bonded to each other with the cover plate 20, and its side of the window is by thisCover plate 20 blocks and opposite side opens, and the locations of structures of the window is exactly the liquid pool 1, liquid pool 2, the locations of structures of liquid pool 10,The quantity of the liquid pool is three, and two liquid pools therein are that liquid pool 1 and liquid pool 2 its locations of structures are located at the micro-fluidic chipSample introduction end 18, a remaining liquid pool are its chip when liquid pool 10 its locations of structures is located at the micro-fluidic chip actual sample introduction testThe terminal 17 of interior liquid flowing, the terminal 17 are located remotely from each other with the sample introduction end 18, and one end of the pipeline is via being similarly positioned in the phaseThe manifold shape turnout 3 for the interface zone being mutually bonded respectively with the liquid pool 1 positioned at sample introduction end 18 and the UNICOM of liquid pool 2, the pipelineThe other end and the remaining liquid pool of the terminal 17 positioned at the micro-fluidic chip be the UNICOM of liquid pool 10, and, according toSequence is respectively installed in working electrode in the pipeline on diverse location and to electrode 8 and reference electrode 9, the working electrodeIt is made up of conductive electrode and the gold size sensitive membrane for having embedded AIDS specific antigen being attached on the conductive electrode,The construction of the pipeline is in parallel construction, and the pipeline in parallel construction is made up of four lateral parallel connections, the work electricityThe quantity of pole is four, and respectively in four laterals, this four work the installation position of four working electrodesElectrode is working electrode 5, working electrode 6, working electrode 12, working electrode 13 respectively, and, four its top layers of working electrodeSpecific antigen in gold size sensitivity membrane structure is the four kinds of AIDS antigen things that can be specifically bound to aids antibody respectivelyMatter, four kinds of antigenic substances are AIDS specific antigen p24, gp41, gp120 and gp36 respectively, for specifically deploying, 5It is that specific antigenic substance in its top layer gold size sensitivity membrane structure being installed in lateral 4 is AIDS specific antigenP24 working electrode, 6 be that specific antigenic substance in its top layer gold size sensitivity membrane structure being installed in lateral 7 isAIDS specific antigen gp41 working electrode, 12 be in its top layer gold size sensitivity membrane structure being installed in lateral 11Specific antigenic substance be AIDS specific antigen gp120 working electrode, 13 be its that be installed in lateral 14The working electrode that specific antigenic substance in the gold size sensitivity membrane structure of top layer is AIDS specific antigen gp36, the workElectrode 5, working electrode 6, working electrode 12, working electrode 13 its material are gold material or thermal decomposition conducting polymer material,The working electrode 5, working electrode 6, working electrode 12, its pattern presentation sheet or thread of working electrode 13, emphasis is the baseIts material of piece 19 is dimethyl silicone polymer material, and its surface of substrate 19 is the surface of primary form, the table of the primary formFace its be intended to refer to the not no primary form of the material by any surface chemical modification or any surface chemical modificationSurface, the structure of the device also include elastic clip 15, and two opposite clamping limbs 16,21 snap-in locations of the elastic clip 15 are at thisThe position of the neighbouring terminal 17 of micro-fluidic chip, attach on a clamping limb at least in it is fixed be equiped with it is micro-Type ultrasonic transducer 22, in legend, the miniature ultrasonic transducer units 22 are to attach to be installed on one of clamping limbOn 21, and, higher-order of oscillation electric signal transmission cable 23, one end of the higher-order of oscillation electric signal transmission cable 23 is miniature super with thisAcoustic wave transducer 22 links together；The elastic clip 15 provides a function of facilitating the device to disassemble；The miniature ultrasonicIts major function of transducer 22 is in the actual sample introduction test of micro-fluidic chip, utilizes the sample introduction end 18 and the terminal 17Difference in the distance between the installation position of miniature ultrasonic transducer units 22 difference and its ultrasonic intensity experiencedIt is different, the difference between its interfacial tension of sample introduction end 18 described in induced synthesis and the terminal 17 its interfacial tension, the micro-fluidic coreThe piece both ends are that the interfacial tension difference between sample introduction end 18 and terminal 17 can be at the both ends of the micro-fluidic chip i.e. sample introduction endPressure gap is formed between 18 and terminal 17, the pressure gap can drive sample solution to be flowed to the direction of terminal 17；It is softAnd the substrate of the dimethyl silicone polymer material its function of having elasticity is included with its property to the strong absorption of ultrasonic wave, to superSound wave is absorbed strongly, and the limited short distance thereby arrived between the sample introduction end 18 in the micro-fluidic chip terminal 17 itInside realize the rapid decrement of ultrasonic intensity；And many silica dioxide granules, many silica dioxide granules are filled inIn the pipeline, its tube chamber of the pipeline is filled up by many silica dioxide granules, its particle diameter model of the silica dioxide granuleEnclose between 10 microns and 200 microns, the silica dioxide granule be silica crystalline particles, silica glass granule orIts inorganic glass particles of shared percentage by weight more than 80% of silica composition.
Arrow in legend indicate the micro-fluidic chip its in actual motion, by pressure at two ends difference drive, its tryThe flow direction of sample liquid stream.
The miniature ultrasonic transducer units 22 and the higher-order of oscillation electricity that the elastic clip 15 is set up thereon are depicted without in Fig. 1Signal transmission cable 23；Also, the higher-order of oscillation electric signal generator and multiple tracks electrochemistry are depicted without in Fig. 1 and Fig. 2The associate members such as work station.
Involved elastic clip 15 is commercially available.It is available for the commercially available alternative spring clamp structure and make that this case structure usesType and size etc., quality is various, and specific elastic clip pattern can be selected as needed.
Involved miniature ultrasonic transducer units 22 are commercially available；It can also be customized to ultrasonic transducer producer.
Involved higher-order of oscillation electric signal transmission cable 23 is commercially available；Can also be special to ultrasonic transducer producer or cableIndustry producer customizes.
Involved higher-order of oscillation electric signal generator market has the product close to needs commercially available；It can also determine to relevant manufacturersSystem.
Each working electrode in this example structure and can be respectively via each special electricity to electrode and reference electrodeCable or say is being got lines crossed respectively with the corresponding cable interface of the multiple tracks electrochemical workstation as annex or saying interface connection of getting lines crossed.
This case device is that a variety of corresponding aids antibodies are detected with a variety of AIDS antigens, thereby diagnoses AIDSDisease.