CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. application Ser. No. 16/186,520, filed Nov. 10, 2018, entitled MODULAR PARALLEL/SERIAL DUAL MICROFLUIDIC CHIP, which claims priority to and the benefit of U.S. Provisional Application No. 62/584,655, filed Nov. 10, 2017, and entitled MODULAR PARALLEL/SERIAL DUAL MICROFLUIDIC CHIP, the contents of which are incorporated by reference herein in their entirety.
TECHNICAL FIELD The present invention pertains in general to a microfluidics lab-on-chip system and, more particularly, to the use of a microfluidics chip and testing at the point of care.
BACKGROUND The emergence and spread of antibiotic-resistant bacteria are aggravated by incorrect prescription and use of antibiotics. Courts have this problem is the fact that there is no sufficiently fast diagnostic test to guide correct antibiotic prescription at the point of care. Currently, some fluid sample is retrieved from a patient and forwarded to a lab for testing to determine a specific treatment regimen. As a safeguard, the patient is sometimes initially given large doses of a general antibiotic until a more specific antibiotic can be determined to target the specific bacteria. This can take upwards of two or three days, as the process requires growing the bacteria in some culture medium and observing its response to various antibiotics.
SUMMARY The present invention disclosed and claimed herein, in one aspect, comprises a system for testing a treatment agent for a predetermined biologic material having a distributor module includes an input for receiving a biologic sample containing a unique combination of a predetermined biologic material that must be treated via one of a plurality of treatment agents and a patient's biologic material. A first reservoir holds the biologic sample containing the unique combination of the predetermined biologic material. A plurality of micro-pumps pumps a portion of the biologic sample from the first reservoir into a connected module. A first module includes a first plurality of testing pathways for testing a first portion of the biologic sample containing the unique combination of the predetermined biologic material and the patient's biologic material. Each of the plurality of first parallel testing pathways applies a different treatment agent of a plurality of treatment agents to the first portion of the biologic sample. A first module connector removeably connects the first module to the distributor module, wherein the plurality of treatment agents tested by the system may be selected by selecting the first module associated with the first module connector. A second module includes a second plurality of testing pathways for testing a second portion of the biologic sample containing the unique combination of the predetermined biologic material and the patient's biologic material in a selected pathway of the second plurality of testing pathways. The selected pathway selected responsive to a control input responsive to results of the first plurality of testing pathways. The selected pathway applies at least one dosage level of a treatment agent to the second portion of the biologic sample. A second module connector removeably connects the second module to the distributor module, wherein treatment agent and the plurality of dosage levels tested by the system may be selected by selecting the second module associated with the second module connector.
BRIEF DESCRIPTION OF THE DRAWINGS For a more complete understanding, reference is now made to the following description taken in conjunction with the accompanying Drawings in which:
FIG. 1 illustrates a high-level view of a microfluidics chip of the present disclosure;
FIGS. 2A-2C illustrate detailed views of the multiple stages of analysis provided by the microfluidics chip of FIG. 1;
FIGS. 3A-3D illustrate diagrammatic views of the various cell capture regions and the interspersed pumps for the microfluidics chip of FIG. 1;
FIGS. 4A-4G illustrates detailed views of the first viewing stage;
FIG. 5 illustrates a detailed view of the first parallel driving stage;
FIGS. 5A and 5B illustrate details of the coating applied to the micro channels in the first driving stage;
FIG. 6 illustrates a detail of the serial driving stage;
FIGS. 7A-7D illustrate detailed views of a valveless nozzle/diffuser micropump;
FIG. 8 illustrates a detailed view of a piezoelectric micropump;
FIG. 9 illustrates a detailed view of a multi-chamber micropump with check valves;
FIG. 10 illustrates a flowchart for the high-level operation of the microfluidics chip;
FIG. 11 illustrates a flowchart for the initial loading operation of the fluid sample;
FIG. 12 illustrates a flowchart for the viewing or cell counter stage of analysis;
FIGS. 13A-13C illustrate diagrammatic use for the cell counter;
FIG. 14 illustrates a flowchart for the main parallel stage of analysis;
FIG. 15 illustrates the serial stage of analysis;
FIG. 16 illustrates a simple fight diagrammatic view of the microfluidics chip;
FIG. 17 illustrates a simplified diagrammatic view of a parallel module;
FIG. 18 illustrates simplified diagrammatic view of a serial module;
FIG. 19 illustrates a simplified diagrammatic view of a serial module arranged in parallel;
FIGS. 20A and 20B illustrated a diagrammatic view of an embodiment utilizing a chemostat;
FIG. 21 illustrates a diagrammatic you have the microfluidics chip utilizing valves;
FIGS. 22A and 22B illustrate cross-sectional views of a micro valve;
FIG. 23 illustrates a diagrammatic view of preparing a biologic sample and disposing it in the well on the microfluidic chip;
FIG. 24 illustrates a cross-sectional view of an RT-lamp interfaced with a cell phone;
FIG. 25 illustrates a perspective view of the RT lamp interfaced with a microfluidic chip and a cell phone;
FIG. 26 illustrates a side view of a cell phone interfacing with the micro fluidic chip;
FIG. 27 illustrates a window view of the camera and the alignment process;
FIGS. 28A-28H illustrate multiple views of a diagram of the microfluidic chip in schematic form and various loading and analysis steps associated there with;
FIG. 29 illustrates a flowchart for the overall analysis process utilizing the microfluidic chip;
FIG. 30 illustrates a flowchart to pick in the details of the test path;
FIG. 31 illustrates a perspective view of a micro modular microfluidic chip;
FIG. 32 illustrates a cross-sectional view in detail of the interconnection in the modular microfluidic chip;
FIG. 33 illustrates a top view of the system for receiving multiple modules; and
FIG. 34 illustrates a top view of the micropump module showing the distribution of microchannels.
DETAILED DESCRIPTION Referring now to the drawings, wherein like reference numbers are used herein to designate like elements throughout, the various views and embodiments of a Modular Parallel/Serial Dual Microfluidic Chip is illustrated and described, and other possible embodiments are described. The figures are not necessarily drawn to scale, and in some instances the drawings have been exaggerated and/or simplified in places for illustrative purposes only. One of ordinary skill in the art will appreciate the many possible applications and variations based on the following examples of possible embodiments.
Referring now to FIG. 1, there is illustrated a diagrammatic view of a microfluidics chip 102 at a high-level view. There is provided in the microfluidics chip 102 an input stage 104 that is operable to receive a biological specimen. As used herein, a “sample” must be capable of flowing through microfluidic channels of the system embodiments described hereinbelow. Thus, any sample consisting of a fluid suspension, or any sample that be put into the form of a fluid suspension, that can be driven through microfluidic channels can be used in the systems and methods described herein. For example, a sample can be obtained from an animal, water source, food, soil, air, etc. If a solid sample is obtained, such as a tissue sample or soil sample, the solid sample can be liquefied or solubilized prior to subsequent introduction into the system. If a gas sample is obtained, it may be liquefied or solubilized as well. The sample may also include a liquid as the particle. For example, the sample may consist of bubbles of oil or other kinds of liquids as the particles suspended in an aqueous solution.
Any number of samples can be introduced into the system for analysis and testing, and should not be limited to those samples described herein. A sample can generally include any suspensions, liquids, and/or fluids having at least one type of particle, cellular, droplet, or otherwise, disposed therein. In some embodiments, a sample can be derived from an animal such as a mammal. In a preferred embodiment, the mammal can be a human. Exemplary fluid samples derived from an animal can include, but are not limited to, whole blood, sweat, tears, ear flow, sputum, bone marrow suspension, lymph, urine, brain fluid, cerebrospinal fluid, saliva, mucous, vaginal fluid, ascites, milk, secretions of the respiratory, intestinal and genitourinary tracts, and amniotic fluid. In other embodiments, exemplary samples can include fluids that are introduced into a human body and then removed again for analysis, including all forms of lavage such as antiseptic, bronchoalveolar, gastric, peritoneal, cervical, athroscopic, ductal, nasal, and ear lavages. Exemplary particles can include any particles contained within the fluids noted herein and can be both rigid and deformable. In particular, particles can include, but are not limited to, cells, alive or fixed, such as adult red blood cells, fetal red blood cells, trophoblasts, fetal fibroblasts, white blood cells, epithelial cells, tumor cells, cancer cells, hematopoeitic stem cells, bacterial cells, mammalian cells, protists, plant cells, neutrophils, T lymphocytes, CD4+, B lymphocytes, monocytes, eosinophils, natural killers, basophils, dendritic cells, circulating endothelial, antigen specific T-cells, and fungal cells; beads; viruses; organelles; droplets; liposomes; nanoparticles; and/or molecular complexes. In some embodiments, one or more particles such as cells, may stick, group, or clump together within a sample.
In some embodiments, a fluid sample obtained from an animal is directly applied to the system described herein at the input stage, while in other embodiments, the sample is pretreated or processed prior to being delivered to a system. For example, a fluid drawn from an animal can be treated with one or more reagents prior to delivery to the system or it can be collected into a container that is preloaded with such a reagent. Exemplary reagents can include, but are not limited to, a stabilizing reagent, a preservative, a fixant, a lysing reagent, a diluent, an anti-apoptotic reagent, an anti-coagulation reagent, an anti-thrombotic reagent, magnetic or electric property regulating reagents, a size altering reagent, a buffering reagent, an osmolality regulating reagent, a pH regulating reagent, and/or a cross-linking agent.
At this point in the process, a finite amount of biofluids is disposed in the reservoir ready for transferring to subsequent stages. This amount of fluid is then transferred to another stage via a driving stage 106 in order to transfer this biofluid to another reservoir, that associated with a viewing stage 108. At this stage, a technician can examine the biofluid and determine the makeup of the biofluid, discriminate cells, etc. in order to make certain decisions as to going forward with remaining tests. The microfluidic chip then transfers the biofluid at the viewing stage 108 to a parallel analysis stage 115 through a parallel driving stage 110 wherein the biofluid is divided among a plurality of parallel path this for analysis of the reaction of the material in the biofluid with different reagents in a reading. This requires a certain amount of the biofluid to be transferred to this analysis stage. Thereafter, a decision is made as to whether to transfer the remaining biofluid from the viewing stage 108, in order to perform more testing and/or analysis on the biofluid. At this stage the process, only one of the multiple second stage or serial stage path is selected. One reason for this is that there is only a finite amount of biofluid available and there is no need for testing along paths that are associated with previous decisions indicating that the results will be negative along these paths. Each of these serial passes associated with one of the parallel paths. Thus, if there are five parallel paths, there will be five serial paths. Note that the term “serial path” is a term meaning that it is within the serial decision tree and it need not actually be a plurality of serial paths that are linked together in a serial manner, although they could be and are in some embodiments described hereinbelow. It is necessary to perform the testing/analysis along each of the five parallel paths, but a decision at this point indicates that only one of the serial paths will be required for the testing/analysis purpose. This will be described in more detail hereinbelow.
Referring now to FIGS. 2A-2C, there are illustrated diagrammatic views of the various stages of the process. With specific reference to FIG. 2A, there is illustrated a diagrammatic view of first viewing stage, wherein the amount of biofluid stored in the input stage reservoir 104 is driven to the viewing stage 108 reservoir. At this stage, optical device 202, for example, can be used to view the cells disposed within the medium. This medium could actually be the actual biofluid that was provided in the sample from the human/animal or could be some diluted version thereof. However, this biofluid will contain some cellular material or some particulate of interest. This can be viewed with the out device 202 and then passed to a processor 204, or a human could analyze the results. With utilization of the processor 204, the actual form of biofluid, and analog form, is transferred to a digital form. This could be in the form of cell counting for verification of a particular cell. As will be described hereinbelow, affinity labels can be associated with each of the cells or particulates in the biofluid and this could facilitate visual recognition of different characteristics or different types of cells, such as proteins, bacteria, etc. Each of these cellular materials can have a particular affinity label associated there with that allows it to be visually identified via some characteristics such as florescence or even magnetic properties associated with the affinity label. Again, this will be described hereinbelow. Although an optical device 202 was illustrated and described, any other type of device for analyzing the characteristics of a particular affinity labeled cell can be utilized, such as some type of magnetometer, etc.
Referring now to FIG. 2B, there is illustrated the next parallel drive stage. At this stage, a micropump is utilized in the parallel drive stage 110 to pump at least a portion of the biofluid stored in the reservoir associated with the viewing stage 108 is transferred to all of the parallel reading/analysis paths. In this step, it can be seen that a portion of the biofluid in the reservoir associated with the viewing stage 108 and is biofluid exists in each of these parallel paths for analysis. There is an indication in one of these parallel paths, associated with the reservoir 210, that shows a positive indication of a reaction of some type that is viewable. If, for example, this were bacteria, one reagent could be an antibiotic in a large dosage that would destroy the particular target bacteria and this would be recognized by an observer. The other three paths, associated with reservoirs 214, 216 and 218 (an example of 4 paths), would have no reaction and, as such, would not have affected the bacteria associated therewith. In this example, a high level of concentrated antibiotic is provided that would destroy the bacteria, but at this level of analysis, there is no indication provided as to the actual dosage of that antibiotic that would destroy the bacteria, other than the fact that a large dosage of this particular antibiotic will destroy the target bacteria. It is important to keep in mind that this particular biofluid may have multiple and different bacteria, proteins, etc. contained therein.
Referring now to FIG. 2C, there is illustrated a diagrammatic view of the final serial stage of analysis/testing. Since the first stage of testing/analysis transferred some of the biofluid from the viewing stage 108 to the parallel stages 114, there is still some biofluid remaining in the viewing stage 108. This is a selectively transferred to one of the serial paths, that associated with the testing reservoir 210. There are provided a plurality of bypass channels 220 associated with each of the serial paths and only the bypass channel 220 associated with the reservoir 210 in the parallel path 114 will be selected for transferring biofluid to this particular serial path associated with the reservoir 210 for testing. It will first be pumped to be a micropump in a serial drive stage 222 to a first serial reservoir 224 for testing/analysis. If the test is negative, it can then be passed to a subsequent serial driving stage 226 to a subsequent serial reservoir 228 for testing/analysis and so on. As will be described hereinbelow, there can be provided a single bypass path 220 which is connected to a manifold associated with each of the serial paths and each of the manifolds can be associated with each of the different reservoirs for testing, i.e., at this point the testing is parallel to all of the subsequent testing reservoirs. In the mode illustrated in this FIG. 2C, it is necessary to transfer all of the necessary biofluid, i.e., typically the remaining biofluid in the viewing stage reservoir 108, to the reservoir 224 and pass all of that biofluid to the next reservoir 228 and so on. Thus, at each stage, all of the biofluid transferred in the subsequent stages is tested at each subsequent stage. In a parallel configuration, the remaining biofluid in the viewing stage 108 would be required to be divided among the different testing reservoirs at each of the subsequent stages. This will be described in more detail hereinbelow.
Referring now to FIGS. 3A-3D, there are illustrated diagrammatic views of the process and fluid flow. In FIG. 3A come there is illustrated an overall process flow for the embodiment described hereinabove. This embodiment, there is provided an input well 302 for receiving the biologic sample indicated by numeral 303. This constitutes a finite volume that must be transferred via a micropump to a viewing reservoir 306. At this point, substantially all of the biofluid is transferred from the reservoir 302 to the viewing reservoir 306. This is the first stage of the process. The second stage of the process is illustrated as providing three separate testing reservoirs 308, 310, 312, attached at one to a microchannel manifold 314. Each of the testing reservoirs 308, 310, 312, as will be described hereinbelow, is comprised of a serpentine microchannel 316 attached at one end to the manifold 314 and at the other end to a viewing reservoir 318. A micropump 320 is provided for transferring biofluid from the viewing reservoir 306 to the manifold 314. This will be divided among the three testing reservoirs 308, 310, 312 and substantially even amounts. The biofluid will traverse the serpentine microchannel 316, which is coated with a particular reagent, one example being an antibiotic. In this example, the antibiotic is at a very high concentrated level, each of the testing reservoirs 308, 310 and 312 having a different antibiotic associated there with. Only a portion of the biofluid in the viewing reservoir 306 will be transferred to these three testing reservoirs 308, 310 and 312 for testing/analysis and viewing at the associated viewing reservoir 318. The serpentine shape, when used with a medium containing cells such as in a biologic sample, facilitates and enhances mixing due to the increased interfacial contact area between the cells within the biofluid sample.
The next step of testing/analysis will be selected only upon a positive test occurring within one of the three testing reservoirs 308, 310 and 312. However, each of the testing reservoirs 308, 310 and 312 has associated there with a subsequent group of testing reservoirs. In this embodiment, each of the subsequent testing reservoirs is comprised of a plurality of sub reservoirs 330, each of the sub reservoirs 330 being configured identical to the testing reservoirs 308, 310 and 312, with a serpentine microchannel region 316 and a viewing reservoir 318. A single bypass microchannel 220 is provided to connect viewing reservoir 306 to a sub reservoir manifold 332. Each of the particular sub reservoir paths have associated there with a separate micropump 334. Only one of these micropumps 334 is selected for transferring the remaining portion of the biofluid stored in the viewing reservoir 306 to the selected path. In this embodiment, the remaining portion of the biofluid is transferred to the first reservoir 330 bypassing the biofluid through the serpentine microchannel 316 to the associated viewing reservoir 318. This particular microchannel will have coating of antibiotic, in this example above, at a relatively low dose. If the bacteria, for example, do not react accordingly with this level of antibiotic, it can be recognized as such in the viewing reservoir 318. It is noted that the antibiotic associated with the coating on the walls of the microchannel 330 at this dosage will not be picked up by the bacteria and, as such, the bacteria in the viewing reservoir 318 for the first sub reservoir 330 in the selected path will still be intact. It can then be pumped from the reservoir 318 associated with the first testing reservoir 330 in the chain to a subsequent testing reservoir 330 with a subsequent micropump 336. This subsequent sub reservoir will have a concentration of antibiotic in its serpentine microchannel 316 that is at a higher level. As the level increases, a gradient is tested for, such that the dosage can be gradually increased until the bacteria are destroyed. If, for example, the bacteria were associated with an affinity label that made it fluoresce, this would be recognized. It could also be that there are multiple bacterial types contained within the biofluid that are each associated with a different affinity label and this could be recognized. It could, in fact, the case that one type of bacteria perfected at a first dosage level of the antibiotic and a second bacteria were affected at a another dosage level of the antibiotic.
Referring now to FIG. 3B, there is illustrated a diagrammatic view of an alternate process flow. This will work substantially identical to the embodiment of FIG. 3A, come up until the operation at the manifold 332 associated with the sub reservoirs. In this embodiment, the three micropumps 334 each feed a sub reservoir manifold 340. Each of the sub reservoir manifolds 340 is connected to a plurality of the sub reservoirs 330 associated with each path. In this embodiment, there are only illustrated three sub reservoirs 330 for each of the sub reservoir manifolds 340, although each path could have a different number of sub reservoirs 330 associated therewith. The difference between these two embodiments is that, at this point, the amount of biofluid remaining in the viewing reservoir 306 now must be divided amongst all of the sub reservoirs attached on one end thereof to the associated sub reservoir manifold 340 selected by the activated one of the micropumps 334. This will result in potentially less biofluid being available for the testing/analysis step. This will also mean that each of the viewing reservoirs 318 associated there with will have a smaller volume associated therewith.
Referring now to FIG. 3C, there is illustrated a diagrammatic view that provides a simplified diagram of the transfer from reservoir to reservoir. In this illustration, the input stage is illustrated as an input reservoir 350 labeled R0. A micropump 352 is operable to transfer the contents of this input reservoir, the biofluid, to a second reservoir, a viewing reservoir 354, labeled R1. A portion of the contents of this reservoir are then transferred via a micropump 356 to a plurality of parallel stage reservoirs 358 labeled R2. This is the first testing/analysis stage. After this stage, the remaining contents of the viewing reservoir 354 are transferred to the subsequent serial stage reservoirs via a pump 360 via a bypass path and microchannel 362. The serial stage reservoirs are labeled R3, R4, etc. This illustration sets forth how the entire contents of the input reservoir RO are transferred down the chain. This is best illustrated in FIG. 3D. In this illustration, it can be seen that entire contents of reservoir RO are transferred to reservoir R1. At this point, only a portion of the contents are transferred to reservoir R2. The remaining contents are sequentially transferred to R3, R4, and so on. For this illustration, the entire remaining contents of the reservoir 354, R1, will be transferred down the chain entirely to reservoir R3, then to reservoir R4, and so on. In the alternate embodiment, as described hereinabove, and not illustrated in FIG. 3D, the bypass 362 could be connected to each of the reservoirs R3, R4, etc. in parallel, noting that the remaining contents of the reservoir R1 will then be divided amongst the parallel connected reservoirs R3, R4, etc.
Referring now to FIGS. 4A-4G, there are illustrated diagrammatic views of the initial processing section associated with the viewing stage 108. There is provided a substrate 402 upon the surface of which are formed a plurality of wells and microchannels. A first well 404 is provided for receiving the biofluid sample in this well has a finite volume associated there with. At the bottom of this well a microchannel 406 extends outward and up to the surface to an opening 408. The purpose of this microchannel 406 extending to the bottom of the well 404 is to ensure that the biofluid can be completely pumped from the well 404. For the formation of this microchannel 406, it might be that the microchannel is formed through the surface of the substrate 402 and then a cover plate (not shown) having a surface that extends down into the open microchannel. An adjacent channel 410 is disposed proximate the opening 408 to provide another opening therefore in order to accommodate a micropump 412 (shown in phantom) interface with the opening 408 and the one end of the microchannel 410 for transferring fluid from the well 404 to the microchannel 410. The microchannel 410 extends along the surface of substrate 402 in order to interface with a viewing well/reservoir 412. As the biofluid passes through the microchannel 410 and the viewing well 412, a desired analysis can be performed on the contents of the biofluid. As described hereinabove, in one example, various cells in the biofluid might consist of different types of bacteria, proteins, etc. and each of these may have associated there with a specific affinity label, which is optically detectable. There are, of course, other means by which affinity labels can be detected. As the cells contained within the biofluid pass through the viewing well/reservoir 414, they can be examined. The viewing well/reservoir 414 on the other side thereof is connected to one side of a microchannel 416, the other side thereof connected to a reservoir 418. Since the micropump 412 must force the biofluid through the microchannels and the viewing well/reservoir 414, there is required the necessity for a holding reservoir 418 to be present. However, initially, this reservoir 418, the microchannel 410 and the viewing well/reservoir 414 will have air disposed therein. This air must be removed. This can be done with a negative pressure of some sort or just a waste gate output to the atmosphere. This is provided by a waste gate microchannel 420 that is connected to an opening 422 through the cover glass (not shown) or to the side of substrate 402. A valve 423 could be provided above the opening 422. As biofluid enters the reservoir 418, air will be pushed out through the microchannel 420. It is desirable for this microchannel 422 to have as low a profile as necessary such that only air exits therefrom. Depending upon the size of the cells contained within the biofluid, the microchannel 420 can be significantly smaller and have a lower profile than the microchannels 410 and 416. Is important to note that, once the micropump 412 transfers the biofluid from the well 404, the volume transferred will be spread between the two microchannels 410 and 416, the viewing well 414 and the reservoir 418. Thus, the reservoir 418 has a significantly larger volume that any of the microchannels 410 and 416 and the viewing well/reservoir 414. Additionally, it may be that the depth of the wells/reservoirs 404 and 418, as well as the viewing well reservoir 414 are also as shallow as the microchannels 410 and 416 but significantly wider to accommodate the required volume.
The outlet of the reservoir 418 is connected from the bottom thereof through a microchannel 426 to an opening 428 on the upper surface of the substrate 402. This is interfaced with a micropump 430 (in phantom) to an adjacent microchannel 432 for subsequent processing. These micropumps 412 and 430, although illustrated as being flush with the substrate, will typically be disposed above the cover plate (not shown) with holes disposed through the cover plate. The opening 428 will be a horizontal microchannel associated with the manifold 314 described hereinabove. This will be associated with a plurality of micropumps 430 for each of the parallel paths or the bypass path. A cross-sectional view of the embodiment of FIG. 4A is illustrated in FIG. 4B, with a cover plate 440 disposed over the substrate 402 with an opening 442 disposed above the well 404 for receiving the biofluid sample.
FIGS. 4C and 4D illustrate top view and cross-sectional views of the reservoir 418 illustrating how the microchannel 416 feeds biofluid into the top of the reservoir 418, and the flow path for the biofluid from the reservoir 418 through the microchannel 426 from the bottom of the reservoir 418. However, it may be that, with capillary action, the depth of the reservoir 418 could be equal to that of the microchannels 416 and 426 such that they are all at the surface of the substrate 402 for ease of manufacturing. When a negative pressure is placed upon the reservoir 418, air will be pulled into the microchannel 426 through the microchannel 420. It is possible in this mode that the micropump 412 could be operated to actually create a positive pressure in the microchannel 416 to force the biofluid in the reservoir 418 into the opening 428 through the microchannel 426. Again, the microchannel 420 would preferably have a dimension that was smaller than the smallest cell size within the biofluid.
Referring now to FIGS. 4E and 4F, there are illustrated top view and cross-sectional views of the reservoir 418 with an alternate embodiment illustrating microchannel 426′ as being beneath the bottom of the reservoir 418 to allow more complete emptying of the reservoir 418.
Referring now to FIG. 4G, there is illustrated an alternate embodiment of inlet wells for receiving the biofluid sample. There is provided the well 404 for receiving the biofluid sample and a second well 464 receiving an additional fluid sample. This fluid sample in well 460 could be some type of dilutant or it could be a medium containing various affinity labels. As noted hereinabove, the fluid sample could have associated there with affinity labels prior to the biofluid sample being disposed in the well 404. However, it is possible that the microfluidic chip have disposed in the well 460 a medium containing affinity labels, for example. The well 460 would be interfaced through a microchannel 462 to an opening 464 adjacent the opening 408. A two input, one output, micropump 412′ that interfaces with the microchannel 410.
Referring now to FIG. 5, there is illustrated a diagrammatic view of the microchannel structure associated with the parallel stage of operation. The microchannel 426 is interfaced with a microchannel manifold 502 which corresponds to the opening 428. This microchannel manifold 502 is interfaced with a plurality of micropumps 504, corresponding to the micropump 430. These micropumps 504 are disposed in pairs, each pair associated with one testing reagent. As noted hereinabove, there are provided a plurality of parallel paths, each associated with a reservoir 312 having a serpentine microchannel 316 and a viewing reservoir 318. The first micropump 504 in the pair of micropumps 504 is connected to one end of the associated serpentine microchannel 316. When this micropump 504 is activated, biofluid from the reservoir 418 is passed through the manifold microchannel 502 and through the serpentine microchannel 316 to the viewing reservoir 318. As was the case above, there is provided a waste microchannel 506 for each of the reservoirs 318 to allow air to escape therefrom as biofluid is forced through the microchannel 316. The micropump 504 associated with this serpentine microchannel 316 will be operated for a sufficient amount of time to transfer sufficient biofluid from the reservoir 418 through the serpentine a channel 316 and finally into the reservoir 318 to fill the reservoir 318. The microchannel 506 can have some type of valve associated with the opening thereof to prevent the escape of any biofluid therefrom or, alternatively, the dimensions of that microchannel 506 could be small enough to prevent any appreciable amount of cells escaping therefrom. Although not illustrated, the one of the pair of micropumps 504 associated with the parallel stage of operation and associated reservoirs 312 will also be operated to fill the associated serpentine microchannel 316 and reservoir 318.
Referring now to FIGS. 5A and 5B, there are illustrated cross-sectional views of the serpentine microchannel 316. As described hereinabove, the sides of these channels 316 are coated with some type of reagent. For example, if a Urinary Tract Infection (UTI) were suspected and were being tested for in the microfluidic chip, the sensitivity for common antimicrobial agents for UTI treatment might include ampicillin (AMP), ciprofloxacin (CIP), and trimethoprim/sulfamethoxazole (SXT), these being three agents that could be tested for and three different paths. The bacteria that might exist within the urine samples from an individual could be any of uropathogenic E. coli strains (EC132, EC136, EC137, and EC462). Some prior research has shown that, through antimicrobial resistance profiles of these pathogens that EC132 is resistant to AMP and CIP but not SXT. EC136 is resistant to AMP only. EC137 is sensitive to all the antibiotics tested. EC462 is resistant to AMP and SXT but not CIP. In order to coat sides of the serpentine microchannels 316, one technique would to have a certain amount of the antibiotic dissolved in sterile water to the serpentine microchannels 316 at different levels. Subsequently, the diluted antibiotic is dried by incubation at a desired temperature and desired time. The original diluted antibiotic has a starting concentration of a predetermined μg/ml concentration. The surface area is sufficiently covered such that, when the biofluid passes thereover, it will interact with reagent.
Referring now to FIG. 6, there is illustrated a microchannel diagram of the reservoir 330 on the surface of the chip 402. This is connected by the microchannel 507 from the associated one of the micropumps 504. After the results in the viewing reservoir 318 have been determined to yield a positive result, for that particular path in the parallel analysis/testing operation, the other of the pair of micropumps 504 is activated and the remaining amount of micro-fluid from the reservoir 418 is transferred to the reservoir 330. This will be passed through the serpentine microchannel 316 and stored in the reservoir 318, labeled 602 in FIG. 6. This is substantially larger than the reservoir 318 associated with the reservoir 312. Thus, for this embodiment, the remaining portion of the biofluid from the reservoir 418 will be substantially stored in the reservoir 602. This will have associated there with a waste microchannel 604 and an outlet microchannel 608 that extends outward from the bottom of the reservoir 602 and up to an opening 610 in the surface of the substrate for interface with the micropump 336. The micropump 336 is operable, at the next stage of the testing/analysis, to move the contents of the reservoir 602 over to the next reservoir 330 for testing at that next concentration level associated with the next reservoir 330 in the sequence.
Referring now to FIGS. 7A-7D, there is illustrated an example of a valveless MEMS micropump. The micropump includes a body 702 with two pumping chambers 704 and 706. At the inlet side of each of the chamber 704 and 706 is disposed a conical inlet 710 and 712, respectively. The conical inlets 710 and 712 are wider at the pump chamber side and narrower at the inlet side thereof. The inlet sides of conical inlet 710 and 712 are connected to respective inlet channel 714 and 716. The outlet side of the chambers 704 and 706 are interfaced with conical outlets 718 and 720, respectively, the conical outlets 718 and 720 having a narrower portion at the outlet of the respective pump chamber 704 and 706 and a wider portion at the respective outlet thereof interfacing with respective outlet channels 722 and 724. The conical inlets 710 and 712 and outlets 718 and 720 are frustro conical in shape. A piezoelectric membrane and actuator 726 is dispose between the two pumping chambers 704 and 706 and is operable to be extended up into one of the chambers 704 and 706 at one time to increase the pressure therein and at the same time extend away from the other of the chambers 704 and 706 to decrease the pressure therein. The operation is then reversed.
The piezoelectric membrane and actuator 726 is comprised of a piezoelectric disc 740 on one side of a membrane 742 and a piezoelectric disc 744 on the other side thereof. Each of the piezoelectric discs 740 and 744 are formed by stratifying a layer of use electric material 748 between two layers of conducting material 750. Piezoelectric material 748 can be made with Piezo Material Lead Zirconate Titanate (PZT-SA), although other piezoelectric materials can be used. The conducting material 60 may be composed of an epoxy such as commercially available EPO-TEK H31 epoxy. The epoxy serves as a glue and a conductor to transmit power to the piezoelectric discs 750. The piezoelectric discs 750 are secured to the surface of the intermediate layer 748, so that when a voltage is applied to the membrane 742, a moment is formed to cause the membrane 742 to deform.
The operation of the micropump will be described with reference to FIG. 7D. At rest, the upper chamber 704 and the lower chamber 706 are separated by a diaphragm pump membrane 742. The diffuser elements 710, 712, 718 and 720 are in fluid communication with each respective chamber. Diffuser elements are oriented so that the larger cross-sectional area end of one diffuser element is opposite the smaller cross-sectional area end of the diffuser element on the other side of the chamber. This permits a net pumping action across the chamber when the membrane is deformed.
The piezoelectric discs are attached to both the bottom and the top of the membrane. Piezoelectric deformation of the plates is varied by varying the applied voltage so as to excite the membrane with different frequency modes. Piezoelectric deformation of the cooperating plates puts the membrane into motion. Adjustments are made to the applied voltage and, if necessary, the choice of piezoelectric material, so as to optimize the rate of membrane actuation as well as the flow rate. Application of an electrical voltage induces a mechanical stress within the piezoelectric material in the pump membrane 742 in a known manner. The deformation of the pump membrane 742 changes the internal volume of upper chamber 704 and lower chamber 706. As the volume of the upper chamber 704 decreases, pressure increases in the upper chamber 706 relative to the rest state. During this contraction mode, the overpressure in the chamber causes fluid to flow out the upper chamber 704 through diffuser elements on both sides of the chamber. However, owing to the geometry of the tapered diffuser elements, specifically the smaller cross-sectional area in the chamber end of the left diffuser element relative to the larger cross-sectional area of the right diffuser element, fluid flow out of the left diffuser element is greater than the fluid flow out the right diffuser element. This disparity results in a net pumping of fluid flowing out of the chamber to the left.
At the same time, the volume of the lower chamber 706 increases with the deformation of the pump member 742, resulting in an under pressure in the lower chamber 706 relative to the rest state. During this expansion mode, fluid enters the lower chamber 706 from both the left and the right diffuser elements. Again owing to the relative cross-sectional geometry of the tapered diffuser elements, fluid flow into the lower chamber 706 through the right diffuser element is greater than the fluid drawn into the lower chamber 706 through the left diffuser element. This results in a net fluid flow through the right diffuser element into the chamber, priming the chamber for the pump cycle.
Deflection of the membrane 742 in the opposite direction produces the opposite response for each chamber. The volume of the upper chamber 704 is increased. Now in expansion mode, fluid flows into the chamber from both the left and right sides, but the fluid flow from the right diffuser element is greater than the fluid flow from the left diffuser element. This results in a net intake of fluid from the right diffuser element, priming the upper chamber 704 for the pump cycle. Conversely, the lower chamber 706 is now in contraction mode, expelling a greater fluid flow from the lower chamber 706 through the left diffuser element than the right diffuser element. The result is a net fluid flow out of the lower chamber 706 to the left.
Referring now to FIG. 8, there is illustrated a cross-sectional view of a piezoelectric micropump with check valves. Membrane 802 is disposed within a pump chamber 804 and secured to a body 806. A piezoelectric disc 808 is disposed beneath the membrane 802 and electrode 810 is disposed below the piezoelectric disc 808. Deformation of the membrane 802 with the piezoelectric disc at the appropriate frequency will cause a volume of the pumping chamber 804 to change. An inlet valve 811 allows fluid to flow into the chamber 804 and an outlet valve 812 allows fluid to flow out of the chamber 804.
Referring now to FIG. 9, there is illustrated a micropump 960 in which a nanofabricated or microfabricated fluid flow pathway is formed between structures. A first reservoir 961 terminates with a first gate valve 966 which permits or restricts fluid flow between the first reservoir 961 and a second reservoir 971. An electrolytic pump 985 drives a first diaphragm 965 which is communication with the second reservoir 971, to close the first gate valve 966, and pulls a second diaphragm 969, which opens a second gate valve 968 to drive fluid from the second reservoir 971 to a third reservoir 973. The electrolytic pump 985 is driven by electrowetting of a first membrane 964 on the first gate valve 966 side of the pump. By switching to electrowetting of a second membrane 963 fluid within the third reservoir 973 is emitted from an exit opening 970 by actuation of the second diaphragm 969.
Referring now to FIG. 10, there is illustrated a flowchart depicting the overall operation of the system. The process is initiated at a Start block 1002 and then proceeds to a block 1004, wherein the biofluid sample is loaded. The process enclosed a block 1006, wherein the biofluid is transferred to the viewing window or the cell counter. The process then flows to a decision block 1008 to determine when the counting operation is done, i.e., when the cells have been discriminated. As noted hereinabove, each of these cells could be associated with, depending on upon the type, a particular affinity label to allow them to be discriminated between within the viewing window. The process then flows to a block 1010 in order to pump the biofluid material to the next phase, that associated with the parallel testing/analysis step. A decision is then made at a block 1012 as to whether this is a positive state, i.e., has any of the biofluid material interacted with a particular reagent to give a positive result. If not, the process is terminated at a block 1014 and, if so, the process flows to a block 1016 in order to capture the biofluid material in a secondary reservoir. Once the path is selected, the appropriate micropump is activated and the biofluid material is pumped to the next reservoir along the secondary path, as indicated by a block 1018. The process then flows to a block 1020 in order to analyze the results at each secondary reservoir and, if there is a positive result, as indicated by block 1022, the process is terminated at a block 1024. If the result is not positive, the process then flows to a block 1026 to determine if that is the last testing reservoir and, if so, the process flows to the terminate block 1024. If there are more testing/analysis blocks through which to process the biofluid material, the process then flows to block 1028 and back to the input of a block 1018 to pump the biofluid serial to the next testing reservoir.
Referring now to FIG. 11, there is illustrated a flowchart for the loading operation, which is initiated at a block 1101 and then flows to a block 1102 wherein the sample is placed in the well and then to a decision block 1104 to determine if this is a process wherein the biofluid sample is to be mixed with some other diluted product or an affinity label. If it is to be mixed, the process flows to a block 1106 to mix the biofluid sample and, if not, the process bypasses this step. The process then flows to a block 1108 in order to activate the pump and transferred the biofluid material after mixing to the next reservoir in the process.
Referring now to FIG. 12, there is illustrated a flowchart for the process of the cell counting operation, i.e., the operation at the viewing reservoir. This is initiated at a block 1202 proceeds to a block 1204 in order to transfer the biofluid material to the viewing chamber. The process enclosed a block 1206 in order to view the cells in real time as they pass through the various microchannels and viewing window. The process then flows to a block 1208 in order to count the cells. At this stage, the cells can have various affinity labels associated there with such that the target cells can be viewed and discriminated between based upon the affinity labels associated therewith. If, for example, there were multiple types of bacteria contained within the biofluid sample and each of these types of bacteria had associated therewith different affinity label that clips arrest at a different color, they killed be discriminated between. Additionally, proteins would have a different affinity label than a bacteria and this would also allow discrimination between the two types of cells. The process then flows to a block 1210 to store the transferred biofluid in the reservoir and into a block 1212 to terminate.
Referring now to FIGS. 13A-13C from their illustrated various configurations for the cell counting operation. In the first embodiment of FIG. 13A, there are provided a three-part microchannel 1302, a middle section microchannel 1304 and an outlet microchannel section 1306 the middle section 1304 has a diameter that is slightly larger than the largest cell that could be contained within the biofluid. This allows the cells to be transferred in a more orderly manner. The cell viewing would be performed at this middle section microchannel 1304. In the embodiment of FIG. 13B, there are provided three varying diameter middle microchannel sections 1308, 1310 and 1312, each with different diameters to allow different size cells to flow therethrough. This type of embodiment may facilitate some selection in the cells for viewing. In the embodiment of FIG. 13C, there is illustrated the above disclose embodiment wherein the microchannel 416 empties into the reservoir 418 and the viewing is basically performed upon the cells within the reservoir 418.
Referring now to FIG. 14 come there is illustrated a flowchart for the parallel cell capture in the first testing/analysis stage. This is initiated at a block 1402 and a process and proceeds to a block 1406 in order to preload all of the cell capture areas having reagent associated there with, such that the portion of the biofluid stored in the reservoir 418 is transferred to the reservoirs associated with the parallel cell capture areas. The process enclosed a block 1408 wherein the pump is activated to fill all of the cell capture wells associated with this stage of testing/analysis. The process then flows to a block 1410 to possibly allow the cells to slowly go through the microchannels in order to interact with the reagent. If so, this requires a certain amount of time and this would result in the micropumps operating at a lower rate to allow sufficient time for the cells to flow through the serpentine microchannels 316 to interface with the particular coating on the surfaces thereof. This basically is the amount of time required for the micropumps to fill up the reservoir 318 associated there with. The length of the serpentine microchannel 316 would determine the amount of time required to fill up the reservoir 318. Once the reservoir has been filled, as indicated by a block 1412, then the viewing window in the reservoir 318 is analyzed, as indicated by a block 1414. The path from the block 1410 to the input of the block 1414 indicates a path by which the micropumps can be run at a higher rate. The process then is terminated at a block 1416.
Referring now to FIG. 15, there is illustrated flowchart for the second phase of the analysis, provided that the first phase indicated a positive result for one of the cell capture areas and the associated reagent. This is initiated a block 1502 and then proceeds to a block 1504 to preload all of the secondary cell capture areas with reagent and into a function block 1506 to pump all of the remaining biofluid material from the reservoir 418 into the first reservoir in the secondary reservoirs 330. This also goes through and incubate step to allow the micropumps to pump at a slower rate to allow the biofluid material to go through the serpentine microchannel 316 at a slower rate before it enters the associated reservoir 318. When the reservoir 318 is filled, as indicate a by block 1510, the contents of the reservoir 318 are analyzed at a block 1512. If the pump can be run at a faster rate, this is provided by a path around the block 1510. If the result is positive, as indicated by a block 1514, then the process is terminated at a block 1516. If not, the process flows from the block 1514 to a block 1518 in order to the next reservoir 330 in the back to the input of the serpentine microchannel 316 and then float the input of the block 1508.
Referring now to FIG. 16, there is illustrated a simplified diagrammatic view of the microfluidics chip for processing a plurality of modules. The sample 303 is input to the well 302 and then pumped into the viewing window 306. A waste microchannel 1602 is provided an interface to the viewing window 306 that is interfaced with a micro valve 1604 to allow air to escape, or any bubbles that may be present, from the viewing window 306. Additionally, the waste microchannel 1602 could interface with an external vacuum source aid in fluid flow. A cell counter/discriminator 1606 is provided for optically viewing the contents of the viewing window 306, the output thereof processed via a processor 1608. The outlet of the viewing window 306 is interfaced with a manifold microchannel 1610 through a connecting channel 1612. At this point, the micro valve 1604 is closed such that the biofluid contained within the viewing window 306 and the interfaced with microchannel manifold 1610 to allow fluid to be pump therefrom to a plurality of distribution paths along distribution microchannels 1614. It may be that pump 304 would need to be activated in order to reduce the pressure at the upper end of the viewing channel 306 or, alternately, a microchannel 1618 interfaced with a micro valve 1620 could be provided to, when open, relieve the pressure in the upper end of the viewing window 306 to allow biofluid to be pumped therefrom to the microchannel manifold 1610.
Each of the distribution microchannels 1614 is interfaced with a separate module via an associated distribution pump 1624 to interface with and associated one of modules 1625, labeled A-Z, for example. There can be any number of modules provided. However, each module 1625 has associated there with a finite capacity and, therefore, the number of modules 1625 that can be interfaced to the viewing window 306 is a function of the volume of biofluid contained therein and the capacity of the reservoirs of each of the individual modules 1625, each of the individual modules 1625 potentially having a different capacity, depending upon the configuration thereof. However, selecting among the various distribution pump 1624 can allow desired tests to be done with the available biofluid contained within the viewing window 306.
Referring now to FIG. 17 there is illustrated a diagrammatic view of one of the modules 1625 associated with the parallel testing configuration, wherein biofluid is loaded into a plurality of testing reservoirs. The distribution pump 1624 associated there with transfers fluid from the distribution microchannels 1614 to an intermediate microchannel manifold 1702 which is then interface with a plurality of testing reservoirs 312, as described hereinabove. Each of these testing reservoirs has a serpentine microchannel 316 and a viewing window 318 associated there with. As described hereinabove, each of these testing reservoirs can have a different volume and a different configuration mechanically and can be associated with a different test. They can each have a particular coating of reagent, such as an antibiotic, to interact with the biofluid for testing purposes to determine if there is any reaction of the biofluid in the cells contained therein to the material coated on the sides of the serpentine microchannels 316. In the operation of this particular module 1625, all of these testing reservoirs 312 are associated with different reagents and will be loaded in parallel. For this embodiment, will be desirable for each of the reservoir 312 to have the same volume. If, however, they had different volumetric capacities, it would be necessary to have some type of waste gate with a micro valve to allow all of the viewing windows 318 to achieve full capacity.
Referring now to FIG. 18, there is illustrated a diagrammatic view of the serial wherein a plurality of testing reservoirs 330 is arranged in a series configuration. In this configuration, the associated distribution pump 1624 will transfer biofluid from the microchannel manifold 1610 through the distribution microchannels 1614 to the first of the testing reservoirs 330. The biofluid will be contained within the viewing chamber 318 and, as noted hereinabove, there will be possible he some type of waste microchannel associated micro valve to allow air/bubbles to escape during filling of the viewing window 318. Thereafter, a second serial pump 1706 is activated to transfer the contents of the viewing window 318 to a second testing reservoir 330 in the associated serpentine microchannel 316 and viewing window three eight teen. In this transfer, there may be required a relief microchannel (not shown) at the inlet end thereof to reduce the pressure therein during the pumping operation. This will continue until all of the tests have been done. Each of the serpentine microchannels 316 associated with each of the testing reservoirs 330 will have a graduated increase in the particular reagent to determine the dosage, in this example. It may be that, upon being exposed to the dosage of the reagent in the first testing reservoir 330 that cellular material in the biofluid is somewhat affected by the reagent, i.e., the antibiotic, for example. By moving to a higher concentration of the reagent in the next sequential testing reservoir 330, this could be accounted for in the overall analysis. It may be that the actual concentration in the next sequential testing chamber 330 is not an exact incremental increase in the reagent. For example, if it was desired to expose the biofluid to reagent increments of 10%, 20%, 30%, etc. in 10% increments, it may be that the first testing chamber 330 has a concentration of 10% and then the second testing chamber has a concentration of possibly 16%, accounting for the fact that the accumulated effect of passing through the 10% testing chamber 330 and the 16% testing chamber 330 effectively provides a 20% accumulated exposure in the second testing chamber 330 and so on.
Referring now to FIG. 19, there is illustrated a diagrammatic view of a configuration for providing parallel loading of the serial configuration for the incremental testing. This is similar to the embodiment of FIG. 17, except that the testing chambers 330 are all interfaced with the associated distribution pump 1624 through a microchannel manifold 1902 in a parallel configuration, such that they are all loaded at the same time, with each having a different concentration of reagent associated there with. In this configuration, however, since all of the testing chambers 330 will be loaded in parallel, there are required to be a sufficient volume of biofluid contained within the viewing window 306 initially to facilitate complete filling of each of the associated viewing windows 318.
Referring now to FIGS. 20A-20B come there is illustrated a diagrammatic view of chemostat, wherein the associated distribution pump 1624 transfers biofluid from the distribution microchannel 1614 two eight chemostat 2002. The details of the chemostat 2002 are illustrated in FIG. 20B. A main microchannel 2004 is interfaced on one and thereof with the output of the distribution pump 1624 associated there with, with the other end of the microchannel 2004 interfaced with a waste gate via a micro valve (not shown). There are a plurality of cell storage microchannels 2006 connected between one surface of the main microchannel 2004 and a waste microchannel 2008. Each of these cell storage microchannels 2006 associated there with a filter 2010 disposed at the end thereof proximate to the waste microchannel 2008. Each of the cell storage microchannels 2006 has a size that will receive a particular target cell having a particular dimension, such that the target cell will flow into the cell storage microchannel and cells of smaller size will pass through the associated filter 2010, which filter 2010 is a microchannel with a diameter that is smaller than that of the target cell. This waste material will flow out through the waste gate or micro valve (not shown) associated with the waste microchannel 2008. By maintaining a pressure differential between the main microchannel 2004 and the waste microchannel 2008, the target cells will be stored within the cell storage channels 2006. Larger cells than the target cells in the main microchannel 2004 will bypass the cell storage microchannels 2006 and pass out of the waste gate associated with the main microchannel 2004, keeping in mind that there is required to be a lower pressure within the waste microchannel 2008 as compared to the main microchannel 2004.
Referring now to FIG. 21, there is illustrated an embodiment of the microfluidic chip utilizing micro valves as opposed to intermediate micropumps. In this embodiment, there are illustrated a plurality of input wells 2102 for interfacing with an initial micropump 2104 to pump fluid through a viewing window 2106 to a first reservoir 2108. Having multiple wells 2102 allows multiple samples to be input through the viewing window 2106 or to actually mix two different materials together for flowing through the viewing window 2106 to the reservoir 2108. The waste gate 2110 can be provided at the reservoir connected thereto via a waste microchannel 2112 to allow air/bubbles to escape. A micropump 2114 is operable to pump fluid from the reservoir 2108 to a main microchannel manifold 2116. During this pumping operation, some type of pressure relief is required which can either be provided via one of the pumps 2104 being activated or a relief micro valve 2118 Interface with the input end of the viewing window 2106 through a relief microchannel 2120.
Interfaced with the main microchannel manifold 2116 is a plurality of distribution micro valves 2124. These distribution micro valves 2124 can be interfaced with various modules, as described above herein with respect to FIGS. 17-20A/b. The only difference is that the associated distribution pump 1624 has been replaced by a distribution valve 2124. Additionally, each of the parallel loaded testing reservoirs 312 can be individually associated with one of the distribution valves 2124 to selectively certain ones thereof for testing. Since each one of these testing reservoirs 312, after selection, is required to be completely filled, by allowing individual selection of the testing reservoirs 312, certain ones thereof can be eliminated. It may be that, in pre-analyzing the biofluid sample, it can be predetermined that certain ones of the associated reagents in the reservoir 312 are not required the testing/analysis step and can therefore be eliminated from the step of filling. This is opposed to the embodiment of FIG. 17, wherein all of the testing reservoirs 312 are complete the filled.
Referring now to FIGS. 22A-22B, there is illustrated cross-sectional views of a micro valve in an open and a closed position. The substrate 402 has cover plate 440 disposed on top thereof. There are provided to microchannels 2202 and 2204 that are to be connected together with the micro valve. The microchannel 2202 is interfaced with a hole 2006 to the surface of the cover plate 440 to an opening 2208. The microchannel 2204 is interfaced to a hole 2210 to an opening 2212 in the cover plate 440. The micro valve has a fixed body 2214 with a membrane 2216 disposed on the surface there above to define a pumping chamber 2218. The pumping chamber 2218 has a hole 2220 interfacing the pumping chamber 2218 with the opening 2208 on the cover plate 440. Similarly, the hole 2212 is interfaced to the pumping chamber 2218 through a hole 2222. The membrane 2216 is operable to reciprocate away from the surface of the fixed body 2214 exposing the top of the hole 2210 in the pumping chamber 2218 to allow fluid to flow through the pumping chamber 2218 and down through the opening 2222 through the cover plate 440 and through to the microchannel 2204. In the closed position, the membrane 2216 is forced down against the upper end of the hole 2220. A pneumatic cavity 2230 is disposed above the membrane 2216 in a housing 2232 and interfaces with a pneumatic source through a hose 2234. Thus, by drawing a vacuum in the pneumatic cavity 2230, the membrane 2216 will be pulled away from the hole 2220 to allow fluid to flow and, when pressurized air is forced into the pneumatic cavity 2230, and the membrane 2216 is forced down to the surface of the fixed body 2214 to seal the opening 2224 in a closed position.
Referring now to FIG. 23, there is illustrated a process flow for preparing the biologic sample for the microfluidic chip 102. The preparation of the biologic sample can take many forms. In this example, the raw biologic sample can be preprocessed, depending upon the type of sample that is being considered. For example, if blood is being tested, the Complete Blood Count (CBC) can be determined, as well as the White Blood Cell Count (WBC), the liver functions and the kidney functions. For urinalysis, the sample can be prepared for testing for WBC's and nitrates, as well as proteins and Bilirubin. There are many well-known processes for preparing biologic samples prior to testing. Once the biologic sample has been prepared a, affinity labels are attached thereto. Typically, there will be a vial 2302 provided with the biologic sample that is mixed with affinity labels in a vial 2303 resulting in the vial 2304 containing a labeled sample. These labels are sometimes referred to as “affinity labels” or “microspheres.” These functional polymeric microspheres typically have a diameter of less than 5 μm and have been developed for use with immunological methods. The reagents were initially used as visual markers to identify specific cell types and analyze the distribution of cell surface antigens by scanning electron microscopy. They have also been used, due to their inherent properties, two separate labeled from unlabeled cells by techniques such as centrifugation, a electrophoresis, magnetic chromatography and fluorescence cell sorting. The cells contained within the biologic sample are basically cells bearing defined antigens or receptors, ligands which bind with a high degree of selectivity an affinity to these cell surface sites. The microspheres interact with the specific ligand, which can allow for separation based upon the characteristic properties of the microspheres. This allows for displaying of these labeled cells with the target receptor or antigen with antibiotics or other ligands directly or indirectly bound to the microspheres. Specific types of microspheres or affinity labels can be the type that will fluoresce at a particular wavelength. Thus, specific cells can be identified the optical techniques to identify target cells or differentiate between various types of, for example, bacterial cells and proteins, etc. This labeled sample is then disposed within the well 302 on the microfluidic chip 102 for later processing.
Referring now to FIG. 24, there is illustrated a side cross-sectional view of an RT-lamp. The RT-lamp is a Reverse Transcription Loop-mediated isothermal Amplification device, which is a technique for the amplification of RNA. This combines the advantages of the reverse transcription without of the LAMP technique. The LAMP technique is a single to technique for the application of DNA. This technique is an isothermal nucleic acid application technique, in which a chain reaction is carried out at a constant temperature and does not require a thermal cycler. The target sequences animal five at a constant temperature using either two or three sets of primers and polymerase with high strand displacement activity in addition to a replication activity. The addition of the reverse transcription phase allows for the detection of RNA and provides a one-step nucleic acid amplification method that is used to diagnose infectious diseases caused by bacteria or viruses.
FIG. 24 illustrates an example in which a multimode instrument 2401 is coupled to a smartphone 2402. The smartphone 2402 includes an LED 2404 and a camera 2406. The camera 2406 includes an image sensor, such as a CCD. The instrument 2401 includes a sample chamber 2408 for receiving an optical assay medium. The optical assay medium comprises the labeled biologic sample disposed within the viewing window 306 on the microfluidic chip 102. The sample chamber 2408 may include a door 2432 that prevents stray light from entering.
The optical assay medium is positioned over a detection head 2412 in the sample chamber 2408. The instrument 2401 includes an optical output path for receiving an optical output from the optical assay medium in the sample chamber 2408 via the detection head 2412. The optical output path may include a multimode fiber 2414 that directs light from the detection head 2412 to a cylindrical lens 2416. The optical output path may further include a wavelength-dispersive element, such as a diffraction grating 2418, that is configured to disperse the optical output into spatially-separated wavelength components. The optical output path may also include other optical components 2430, such as collimating lenses, filters, and polarizers.
The instrument 2401 can include a mount for removably mounting the smartphone 2402 in a working position such that the camera 2406 is optically coupled to the optical path, for example, in a predetermined position relative to the diffraction grating 2418. In this working position, the camera 2406 can receive at least a portion of the dispersed optical output such that different locations are received at different locations on the image sensor.
The instrument 2401 may also include an input optical path for directing light from a light source to the optical assay medium in the sample chamber 2408, for example, through the detection head 2412. In some instances, the LED 2404 on the smartphone 2402 could be used as the light source. To use the LED 2404 as the light source, the input optical path may include a collimating lens 2420 that receives light from the LED 2404 when the smartphone 2402 is mounted to the instrument 2401 in the working position. The input optical path may further include a multimode fiber 2422 that directs the light from the collimating lens 2420 to the detection head 2412. The input optical path may also include other optical components, such as collimating lenses, filters, and polarizers.
The instrument 2401 may also include an additional input optical path that directs light form an internal light source, such as a laser 2424, to the optical assay medium in the sample chamber 2408. The additional input optical path may include a multimode optical fiber 2426, as well as collimating lenses, filters, polarizers, or other optical components 2428.
Referring now to FIG. 25, there is illustrated the view of the RT-lamp 2401 with a microfluidics chip 102 disposed within the sample chamber 2408.
Referring now to FIG. 26, there is illustrated a side view of the smart phone 2402 interfaced with the microfluidic chip 102 four imaging the surface thereof, which is illustrated in a window view in FIG. 27. This window view illustrates the viewing window as a box 2702 in which the image of the microfluidic chip 102 is displayed. The application automatic the recognizes various markers 2704, 2706 and 2708 one three corners thereof. This will allow orientation of the window with respect to the application. A box 2710 in phantom dashes will be oriented by the application running on the smart phone 2402. Once the box has been oriented visually about the image of the microfluidic chip 102, then processing can proceed. The processing is basically focusing upon the chip to gain the best optical image of the target sites. The target sites are storage reservoirs 312 and 330, for example. Each of these will have a viewing well 318 associated there with an these viewing wells 318 will have, and one example, a process biologic sample having affinity labels associated there with that fluoresce. By recognizing the florescence, the presence of the cell can be determined. The lack of florescence indicates that the cell, a bacteria for example, has been destroyed. This can be a positive test. By examining at each stage of the testing process the chip, a determination can be made as to results in essentially real time. This will be described in more detail hereinbelow. Once the image is believed to be in focus, then the user can actually take the picture or the application cell can automatically determine that the focus is adequate and take that. This is very similar to character recognition techniques that are utilized in recognizing faces in camera images received by the phone.
Referring now to FIGS. 28A-28H, there are illustrated various images of the microfluidic chip 102 at different stages, this view being a diagrammatic view for simplicity. In this view, there is provided the sample well 2802 which then feeds into the viewing well 2804. As described hereinabove, there are multiple pumps that allow fluid to be moved from the sample well 2802 over to the viewing well 2804 and these are not shown force simplicity purposes. There is provided a multiplexer 2806 which represents the micropumps/valves described hereinabove. The multiplexer 2806 may be associated with one bank 2808 of reservoirs 2802 for the parallel processing stage. These reservoirs 2012 correspond to the reservoirs 312. This requires that the multiplexer 2806 distribute fluid to a microchannel manifold 2810 and one testing phase. The multiplexer 2806 also is connected via a plurality of microchannels to a bank of reservoirs 2814 associated with the serial processing stage to selectively distribute fluid to one of the strings in a second testing phase. This bank of reservoirs includes the reservoirs 330 described hereinabove. Each of these reservoirs 330 is arranged in series such that each has a valve or pump 2816 disposed there between. The multiplexer 2806 also interfaces with a bank 2820 of reservoirs, these, in this example, associated with the serial testing/analysis stage and having reservoirs 330 associated there with. In this example, there are provided five test reservoirs in the bank 2808, wherein each of these test reservoirs has associated there with one serial string of test reservoirs 330 in the bank 2814 and one parallel loaded string of reservoirs 330 in the bank 2820. Additionally, there is a separate testing reservoir 2824 which could correspond to the cell storage area utilizing a chemostat described hereinabove, which is interfaced with multiplexer 2806 through a microchannel 2826.
Referring now to FIGS. 28B-28H, there are illustrated various stages of the loading and analysis. FIG. 28B illustrates the first step in the process wherein the biologic sample is loaded into the viewing window 2004. That the step in the process, the microfluidic chip is disposed within the RT lamp 2401 and analyzed to determine the number of cells and the type of cells. If, for example, a certain bacteria were being tested for on this particular microfluidic chip 102, the lack of bacteria cells, as indicated by the particular affinity labels that would be attached to these particular bacteria cells, would indicate that further testing is not required. However, if the correct cells are labeled and the number of cells is at an appropriate level for testing, then the next step of the process is taken.
FIG. 28C illustrates a next step of the process wherein a portion of the contents of the viewing well 2804 are transferred to all of the reservoirs 28 one two in the bank 2808, there being five reservoirs 2812 disposed therein, the indirect dies that there could be more reservoirs 2012 provided on the microfluidic chip 102. There will be a certain amount of time required for the pump associated with the multiplexer 2806 to actually move the desire portion of the biologic sample through the manifold 2810 to the reservoirs 2812. As noted hereinabove, each of the reservoirs 2812 corresponds to the reservoirs 312, each having a serpentine microchannel 316 and a viewing reservoir 318 associated there with. The micro pumps associated with the multiplexer 2806 and, nation with the very small widths of the microchannels can require this process to take upwards of 10 or 20 minutes. After this period of time, the microfluidic chip 102 can be imaged to determine if the cells have been destroyed by the coating on the surfaces of the serpentine channel 316. (It should be noted that the viewing well 318 could also be coated). If the cells are destroyed, this indicates that the reagent that coats the walls of the microchannel associated with the reservoirs 312 reacted in a manner indicating self-destruction. However, any visual indication in the viewing wells that can be a vehicle for discrimination between interaction with the particular reagent coating the walls of the serpentine microchannels 316 will provide the ability for a decision to be made as to which reagent is required for further testing.
FIG. 28D illustrates the next phase of operation, which is the phase in which the dosage level is term and. In the example above, the middle reservoir in the bank 2808 provided a trigger indication that triggered a decision to then test for dosage in the middle string within the bank 2814. This will require a multiplexer 2806 two only transfer the remaining portion of the biologic sample from the viewing reservoir 2804 into this particular string. As described hereinabove, this process will involve first passing of fluid to the first reservoir 330, which will take a certain amount of time to actually pump the biologic sample through the microchannels into the viewing window 318. This can be a multiphase process, which requires viewing at each stage. In this particular example, the third stage of testing in this middle string in the bank of reservoirs 2814 resulted in a perceivable result, i.e., a lack of florescence, for example. At this point, the image will actually show the perceivable result in both the bank 2808 and in the bank 2814. Thus, in the three phases of testing, the particular cells have been a defined, an indication has been provided as to which of multiple reagents that could possibly provide the desired therapeutic results would be the best choice for the patient and then the third phase of testing provides the actual dosage of that determine reagent. It may be that for ten individuals that had exactly the same symptoms and processed a similarly processed biologic sample for testing in the same way with the microfluidic chip and the RT-lamp 2401 came up with different results. Each individual's particular physiology can vary and, as such, the results could differ. In a typical medical environment, the particular reagent of choice or drug of choice is determined by an individual based upon various criteria. Since the medical professional does not have the test directly in front of them, they might just prescribe, for example, a broad based antibiotic. They might follow that up with testing of a biologic sample in a lab, which could take a number of days just to determine exactly what bacteria is present and what would be the best antibiotic to use in order to attack this particular bacteria. Of course, the broad-spectrum antibiotic might have worked by the time the test results come back. If not, these results might be useful to the medical professional. However, these tests seldom if ever actually focus in on the dosage that would be preferable for a particular individual. If even the particular antibiotic could be identified which was specific to that particular bacteria tested for and found be present in the biologic sample, the dosage prescribed is typically a medium or high dosage, depending upon the criteria that the medical professional utilizes. However, the medical professional typically generalizes the physiology of any individual and maybe filters that based upon age, gender, etc. However, the individual physiology is not taken into account.
With use of the present microfluidic chip 102, the entire testing process can be performed at the Point of Care (POC) in a relatively short amount of time. The result is not only the identification of the best reagent to use but also the dosage. This is all accomplished with a very small amount of biologic sample.
FIG. 28E, there is illustrated a potential further processing that can be provided. In this embodiment, the bank 2820 can have a different modification of the antibiotic that was determined from the test associated with the bank 2808. This modification could be associated with the pH of the antibiotic, wherein it has been determined with respect to some antibiotics that the pH of the antibiotic can affect the efficacy thereof. In this example, it can be seen that the third reservoir with respect to dosage is the one that is selected in the bank 2814 but in the bank 2820, is the lowest dosage. Thus, the multiplexer 2806 needs to first test the bank 2814 and then test the bank 2820. However, it should be understood that both the bank 2814 and the bank 2020 could be identical, either serially loaded or parallel loaded, the commonality being that they have a gradually increasing dose of antibiotics that can be tested for.
FIGS. 28F-28G, there are illustrated two additional examples of two different patients with substantially the same symptoms and utilizing substantially the same process for preparing the biologic sample. With respect to FIG. 28F, the fifth reservoir and the antibiotic associated there with exhibited the highest efficacy at the highest dose as to destroying the particular bacteria, in the example of the bacteria. The associated dosage determined from testing the biologic sample in the bank 2814 was considered to be the second level of dosage. In the bank 2020, the third level of dosage was considered to be the lowest dose. With respect to FIG. 28G, the first reservoir and the antibiotic associated there with was considered to have the highest efficacy with respect to dealing with the particular bacteria and it was the lowest dose in that case when tested in the bank 2814, as compared to the fourth level dosage in the bank 2820. It can be seen thus that different patients will have different “fingerprints” associated with the testing of the same biologic sample repaired and substantially same way.
FIG. 28H, there is illustrated an alternate embodiment wherein the test performed at the bank 2808 resulted in a slight ambiguity in that the bacteria were killed in two other reservoirs. In this case, the indication would be that either of these antibiotics would work against this particular strain of bacteria. Thus, the next phase the test would require the multiplexer 2806 to distribute the contents of the reservoir 2804 through the microchannels to actually two different strings. Thus, for this type of test to be carried out, it is important that there be sufficient volume in the viewing window 2804, i.e., sufficient amount of biofluid introduced to the well 2802, in order to fill both of these reservoirs and allow the testing to progress down to the highest dosage level in either or both of the banks 2814 and 2820. The results of this test show that, for the rightmost reservoir in the bank 2808 having been determined to be effective at the highest dose, the next of the last dosage was required in order to achieve the desired results, whereas the next to the left reservoir in the bank 2808 having been determined to be effective at the highest dose required only the smallest dose to achieve the results. Therefore, this test shows that, although two antibiotics would work, one would actually work with the lower dose.
It should also be understood that, in addition to the test being different for the same strain of bacteria in a biologic prepared men substantially the same way, it should also be understood that this particular set of results could be different for different strains of the same bacteria. It may be that, for one strain, one antibiotic would work at a particular dose and, for another strain of the same bacteria, a different antibiotic work or just a different dose of the same antibiotic. The microfluidic chip described and disclosed in the present disclosure allows this determination to be made utilizing a single sample in a parallel/serial testing method at the POC wherein the first step or phase of selection is made among a plurality of potential antibiotics that could arguably target different bacteria and, once a determination is made at the first phase, then the next and serial decision is made to determine dosage at a second phase.
Referring now to FIG. 29, there is illustrated a flowchart depicting the overall analysis process. The process is initiated at a block 2902 and then proceeds to a block 2904 wherein the biologic sample is prepared. As described hereinabove, this preparation involves labeling the cells within the biologic sample so that they can be discriminated between or identified. It may be that there are a number of different types of cells such as bacteria of different strains and types, proteins, etc. Different affinity labels can be applied such that multiple cells of different types can be identified. The process then flows to a block 2906 wherein the biologic sample is placed into the sample well and then passed on to the viewing well. At this point, the microfluidic chip is placed into the RT-lamp and optically analyzed, as indicated by process block 2908. It is at this point in the testing phase that the identification process will identify the potential target cells. Since each of the microfluidic chips has a finite number of reservoirs associated there with for the purpose of testing, the coating is applied to these particular reservoirs for the specific antibiotics or reagents to be tested may not be useful for testing the particular cellular structures that have been identified at this step in the process. However, it should be understood that the number of different banks of testing reservoirs that can be provided on a particular microfluidic chip can be expandable and the could actually be provided for multiple different types of reagents. For example, one set of testing banks may be associated with UTI and another associated with streptococcal bacteria. Recognizing these at this step in utilizing them with a microfluidic chip that can test for both types of bacteria will allow the particular biologic sample, which is quite small, to be routed to the appropriate reservoirs for testing for that specific identify bacteria.
The decision to proceed is determined at a decision block 2910 and, if testing can proceed with the current microfluidic chip, the process proceeds to a block 2911 to select the particular test that are to be performed. The process then proceeds to sequence through the tests, as indicated by a block 2914. This sequencing sequences through the various phases, with the initial test being selected first, as indicated by block 2916. In the above examples, this is the first parallel phase to determine which among several reagents is most effective against the particular cellular structure of interest. The process and proceeds to a block 29 eight teen in order to analyze the results of this initial test and then to a decision block 2920 to determine if more tests are required or if this is the only test. If the test is negative at this stage and none of the reagents provides any effectiveness indication, the process is terminated or, if this is the last test, the process is terminated. The process, if continued, then selects the next test in the sequence and proceeds back to the input of the block 2918 to continue sequencing through the tests.
Referring now to FIG. 30 come there is illustrated a flowchart for the testing process. This is initiated at a block 3002 and then proceeds to a block 3004 two first pump a portion of the biologic sample stored in the viewing window through to the parallel reservoirs and load all of the parallel reservoirs for testing/analysis. This may take upwards of 10 or 20 minutes, due to the fact that the micropumps utilized are relatively slow and the diameter of the microchannels is small, thus restricting high flow rates. The process then flows to decision block 3006 to determine if there is been any positive result, i.e., is there any indication that any of the reagents provide an effectiveness indication, either through some color change or the lack of color indicating the destruction of the cells. If there is no result, then the process is terminated in the process flows to a function block 3008 two select the next test path that is associated with the antibiotic having been tested as being effective in the first phase of operation/testing. A process block 3010 and indicates that a graded dosage test path is selected, either the one for loading parallel or the one or loading serially. It should be understood that the parallel loaded graded dosage test path requires all of the reservoirs to be completely filled from the reservoir associated with the viewing window. The serial path, by comparison, allows all of the contents of the viewing window in the reservoir associated there with to be disposed in each reservoir and then sequentially transferred to the next reservoir down the chain and at the higher dosage. However, it should be understood that the system can be configured such that the first reservoir at the lowest dosage is loaded with only a portion of the contents of the viewing window and the reservoir associated there with, analyzed and then a micro valve gate opened to allow the micropumps for pumping fluid to the serial path to operate to continue pushing more biofluid through the first reservoir, thus filling the second and reservoir and so on. In this process, sufficient biofluid must be contained within the viewing window and the reservoir associated there with in order to allow for filling of all of the reservoirs down to the highest dosage rate associated with that serial string.
In the process, the serial string will first select the lowest graded dose reservoir and a process block 3012 and then pump biofluid to the first reservoir and a process block 3014, analyze the results a process block 3016, understanding that it could take 10 to 20 minutes to fill each reservoir. A determination is made at a decision block 3018 as to whether there is a positive result, i.e., was there and an effectiveness determination made at this point, and, if so proceed to a decision block 3020 to determine if there are any higher concentrations to be tested for. If so, the next reservoir selected by opening gate or activating a micropump, as indicated by a process block 3022, and the proceed back to the process block 3014 in order to pump to this reservoir.
In the parallel process, a process block 3026 indicates an operation wherein the micropump pumps sufficient biofluid material to the parallel rated reservoirs to fill all of the reservoirs and into a process block 3028 in order to analyze the results.
Referring now to FIG. 31 there is illustrated a perspective view of a modular microfluidic chip system 3102. The system 3102 includes a microfluidic distributor chip 3104. This chip is similar to the microfluidic chip 102 described hereinabove, with the exception that only a portion of the microchannels and wells are contained thereon. In this embodiment, the sample well 302, the first micropump 304 and the viewing well 306 are all contained on the surface of the distributor chip 3104. The output side of the viewing well 306 is interfaced with a micro pump distributor 3108. In this embodiment, there are provided on one side of the distributor chip 3104 three ports 3110, 3112 and 3116, each interfaced with the micropump distributor 3108 through a separate microchannel. Certainly, on the other side of the distributor chip 3104 are provided three complementary ports 3116, 3118 and 3120, each interfaced with the micro-pump distributor 3108. At one end of distributor chip 3104 are provided two ports 3122 and 3124, each interfaced with the micro-pump distributor 3108. The three ports 3110-3114 all disposed on the edge of the distributor chip 3104 and interfaced with a slot 3126. Similarly, the three ports 3116-3120 are disposed on the outside of the chip and interfaced with a slot 3128. Similarly, the portion 3122 and 3124 are disposed on the edge of the distributor chip 3104 and interfaced with a slot 3130.
Each of the slots 3126-3130 is keyed to receive a module. There is illustrated a single module 3132. The module 3132 is similar to the microfluidic chip 102 and that it has microfluidic channels, testing reservoirs, etc. disposed thereon. Any combination of testing reservoirs, micropumps, valves, etc. can be disposed on this module 3132. At the edge of this module are provided three semicircular keyed sections 3134, 3136 and 3138. Each of the keyed sections 3134-3138 is associated with a respective one of the ports 3116-3120 and correspondingly shaped portions of the slot 3128. There are complementary ports 3138, 3140 and 3142 in the respective keyed sections 3138-3134 that correspond to and interface with the ports 3116-3120, respectively. When the module 3132 is fully inserted within the slot 3128, the ports 3138-3142 have a fluid interface with the ports 3116-3120. Thus, modules can be interchanged to provide different functions. Additionally, if one module were associated with, for example, the parallel loading operation wherein multiple different reagents at the high concentration level and associated with one particular type of bacteria were contained within different associated reservoirs, another module with a similar structure could have different reagents contained therein that are associated with a another type of bacteria. Thus, in the first phase of testing, utilizing the RT-lamp, the type of bacteria could be determined and the testing/analysis step performed the next phase of testing could then be determined so as to enable the correct module to be selected.
Referring now to FIG. 32, there is illustrated a cross-sectional view of the interface between the ports on the distributor chip 3104 and on the module 3132. The distributor to 3104 contains a base substrate 3202 upon which is disposed in the upper substrate 3204 four containing microchannels. Disposed above the substrate 3204 is a cover plate 3206. Illustrated within the substrate he 204 is a single microchannel 3208 which extends along the surface of the substrate 3204 and then extends downward through a vertical microchannel 3210 two an opening or port 3212. The opening is disposed on the upper surface of the slot 3128, this being a surface 3150. The slot 3128 has a corresponding bottom surface 3152 to provide an opening for receiving the module 3132. The module 3132 has a substrate 3154 containing microchannels, a single microchannel 3156 illustrated. The module 3132 has a cover plate 3158 disposed above the substrate 3154 with a vertical microchannel 3160 disposed there through to an opening 3162. This opening 3162 is operable to interface with the opening 3212 when the module 3132 is inserted in the slot 3128. Some type of flexible membrane 3166 could be provided on the cover plate 3158 to provide a fluid seal. However, a tight fit between the cover plate 3158 and the bottom surface of the substrate 3204 should provide an adequate seal for the microfluidic channel formed between the two devices.
Referring now to FIG. 33, there is illustrated a system level top view of the modular system. There are illustrated multiple modules 3132 having three ports associated there with for interfacing with either of the slots 3128 or 3126. There is provided a single two port module 3170 for interfacing with the slot 3130. These modules can each have different functionality associated there with and are operable to be inserted into the slots to very the functionality of the overall chip.
Referring now to FIG. 34, there is illustrated top view of the distributor chip 3104 illustrating the micropump distributor 3108 illustrating that a plurality of micropumps 3174 are disposed around each of the edges to interface with the various ports 3110-3124. There is provided a single pump for pumping from the well 306 into a central distributor manifold 3176.
It will be appreciated by those skilled in the art having the benefit of this disclosure of a Modular Parallel/Serial Dual Microfluidic Chip. It should be understood that the drawings and detailed description herein are to be regarded in an illustrative rather than a restrictive manner, and are not intended to be limiting to the particular forms and examples disclosed. On the contrary, included are any further modifications, changes, rearrangements, substitutions, alternatives, design choices, and embodiments apparent to those of ordinary skill in the art, without departing from the spirit and scope hereof, as defined by the following claims. Thus, it is intended that the following claims be interpreted to embrace all such further modifications, changes, rearrangements, substitutions, alternatives, design choices, and embodiments.
