Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
  • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
  • G01N33/54366—Apparatus specially adapted for solid-phase testing
  • G01N33/54386—Analytical elements
  • G01N33/54387—Immunochromatographic test strips
  • G01N33/54388—Immunochromatographic test strips based on lateral flow
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
  • G01N33/558—Immunoassay; Biospecific binding assay; Materials therefor using diffusion or migration of antigen or antibody
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
  • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
  • B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
  • B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
  • B01L3/5023—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures with a sample being transported to, and subsequently stored in an absorbent for analysis
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
  • B01L2300/00—Additional constructional details
  • B01L2300/04—Closures and closing means
  • B01L2300/041—Connecting closures to device or container
  • B01L2300/042—Caps; Plugs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
  • B01L2300/00—Additional constructional details
  • B01L2300/08—Geometry, shape and general structure
  • B01L2300/0809—Geometry, shape and general structure rectangular shaped
  • B01L2300/0825—Test strips
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
  • B01L2400/00—Moving or stopping fluids
  • B01L2400/04—Moving fluids with specific forces or mechanical means
  • B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
  • B01L2400/0481—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure squeezing of channels or chambers

Definitions

• One or more embodiments of the invention relate generally to apparatus for analyzing liquids, such as body fluids, using labeled molecular affinity binding, such as immuno-chromatography. More particularly, the invention relates to strip test apparatus for detecting an analyte, such as an antibody or antigen, which may indicate a particular condition.
• analyte such as an antibody or antigen
• Labeled molecular affinity binding such as immunochromatographi c assays
• immunochromatographi c assays have existed for decades and have proven to be an inexpensive way to screen for various conditions, such as abused drugs, and other conditions, such as pregnancy and cancer, or for single or multiple pathogenic conditions, such as HIV infection.
• lateral flow strip technology In the point-of-care test (POCT) setting, immunochromatographic assays are typically conducted using lateral flow strip technology as described in May et al., U.S. patent number 5,656,503, incorporated herein by reference.
• lateral flow devices antibodies are movably supported on a solid support, such as a porous pad.
• Antigen derivatives are deposited as immobilized indicator lines downstream of the antibodies, whereby the target antigens in a fluid sample flow laterally as a liquid matrix by capillar action through the solid support.
• the antibodies are normally colored for visual indication.
• the fluid sample carries the antibodies downstream towards the indicator lines of immobilized antigen derivatives while a reaction takes place between the target antigens and the antibodies.
• any antibodies that have not reacted with the antigen in the sample bind to the antigen derivatives at the indicator lines.
• most or ail of the colored antibodies are carried downstream to the indicator lines of the immobilized antigen derivatives.
• the colored antibodies bind together with the antigen derivatives in such concentrations that the colorant of the antibodies becomes readily visible.
• the antigen derivatives' and the antibodies' roles can be interchanged. That is, the antigen derivatives can be labeled with colorant and movablv placed in the solid support while the antibodies are placed as immobilized deposited indicator lines downstream .
• IVD test devices The reasons for the insufficient accuracy in many rapid in vitro diagnostic (IVD) test devices are primarily due to their current lack of overall higher sensitivity and specificity. Different samples may contain chemicals or particles which inhibit the rapid and well mixed liquid flow or otherwise interfere with one or both of the first and second affinity binding reactions.
• the manufacturing step of pretreating with a second pretreatment chemical can dislodge some of the first pretreatment chemical.
• clumps of non-analyte molecules can carry an overabundance of the labeled mobiiizable binding members to the second affinity binding site to generate a false positive result.
• Lateral flow devices are useful due to their low cost and ease of use.
• prior lateral flow devices suffer from low accuracy and relatively long test wait times as detailed above. This is especially true for saliva testing because of the low
• the low accuracy can be due to a number of problems unique to lateral flow- type tests.
• Embodiments of the present invention provide a device for testing a liquid sample for the concentration of at least one analyte comprising a cover; a base connecting to the top member forming an internal cavity therein configured to receive a test strip; compression bars formed in the cover, a compression cushion formed in the base, the compression bars and compression cushion configured to sandwich a conjugate pad of the test strip when the test strip is disposed within the internal cavity, and a cap fitting over a first end of the device, the cap configured to press the compression bars of the cover toward the compression cushion, thereby driving the liquid sample along the test strip during a test.
• Embodiments of the present invention further provide a test system for testing a liquid sample for the concentration of at least one analyte comprising at least one test strip including a conjugate pad including a source of mobilizable labeled first affinity binding members bindable to the analyte and a liquid permeable reaction region including at least one strip line including immobilized second affinity capture binding members bindable to said analyte; and a test device including a cover, a base connecting to the top member forming an internal cavity therein containing the test strip;
• compression bars formed in the cover; a compression cushion formed in the base, the compression bars and compression cushion sandwiching the conjugate pad of the test strip; and a cap fitting over a first end of the device, the cap pressing the compression bars of the cover toward the compression cushion, thereby driving the liquid sample along the test strip during a test.
• Embodiments of the present invention also provide a method for testing for an analyte in a sample comprising disposing at least one test strip into an internal cavity formed between a cover and a base of a test device; introducing a liquid sample through a sampling well of the cover onto a porous region of the test strip; sliding a cap onto a first end of the test device to move compression bars formed in the cover toward a compression cushion formed in the base, wherein a conjugate pad of the test strip is sandwiched between the compression bars and the compression cushion; directing the liquid sample through the conjugate pad of the test strip; and exerting an increasing force on the conjugate pad of the test strip as the cap is slid further onto the first end of the test device.
• the results can be rapid qualitative/quantitative results with up to 99% accuracy.
• the structure of the rapid diagnostic test device causes a high speed, rapid flow of liquid out of a fluid collector toward a reaction region of the test strip.
• a labeled molecular affinity binding assay strip device having a source of m obi Sizable first affinity binding members in the conjugate color pad and a number of fixed second affinity binding sites in the reaction region of the test strip, where the reaction region is visible through a result window of the test device.
• the diagnostic test device provides a more predictable rate of uptake of labeled analytes at the strip lines in order to provide a quantitative result.
• FIG. 1 is a diagrammatical perspective view of an assay cartridge according to an exemplary embodiment of the invention
• FIG. 2 is a diagrammatical cross-sectional side view of the assay cartridge of FIG. 1 taken along line 2-2 shown in the cap open position;
• FIG. 3 is a diagrammatical cross-sectional side view of the assay cartridge of FIG. 2 taken along line 3-3 showing the strip-enclosing constriction structure;
• FIG. 4 is a diagrammatical cross-sectional side view of the strip of FIG. 2;
• FIG. 5 is a diagrammatical cross-sectional side view of the assay cartridge of FIG. I shown in the cap closed position;
• FIG. 6 is a diagrammatical cross-sectional side view of the cartridge of FIG. 1 showing progressive compression force components at various times and position during cap emplacement,
• FIG. 7 is a diagrammatical chart showing progressive compression force components at various times during cap emplacement
• FIG. 8 is a diagrammatical chart showing the relatively uniform flow magnitude during a transition from primarily a compression driving force to a siphoning driving force
• FIG. 9 is a diagrammatical cross-sectional side view of an alternate embodiment of a cap having a strip crumpling structure
• FIG. 10 is a diagrammatical cross-sectional side view of an alternate
• FIG. 11 is a diagrammatical cross-sectional side view of an alternate
• FIG. 12 is a diagrammatical cross-sectional side view of an alternate
• FIG. 13 is a diagrammatical cross-sectional side view of an alternate
• FIG. 14 is a diagrammatical cross-sectional side view of the cartridge of FIG. 1 loaded in a result reader;
• FIG. 15 is a diagrammatical cross-sectional side view of an assay cartridge according to an alternate exemplary embodiment of the invention having a light emitter enhanced reader;
• FIG. 16 illustrates a partially transparent perspective view of a rapid diagnostic test device, having three test strips and a fluid collector disposed therein, in accordance with an embodiment of the present invention
• FIG. 17A illustrates a front perspective view of a top member of the rapid diagnostic test device of FIG. 16;
• FIG. 17B illustrates a front view of the top member of the rapid diagnostic test device of FIG. 16;
• FIG. 17C illustrates a side view of the top m ember of the rapid diagnostic test device of FIG. 6;
• FIG. 18A illustrates a front perspective view of a bottom member of the rapid diagnostic test device of FIG , 16,
• FIG. 18B illustrates a front view of the bottom member of the rapid diagnostic test device of FIG. 16;
• FIG 18C illustrates a side view of the bottom member of the rapid diagnostic test device of FIG. 6;
• FIG. 19A illustrates a front perspective view of a cap member of the rapid diagnostic test device of FIG. 16;
• FIG. 9B illustrates a back view of the cap member of the rapid diagnostic test device of FIG. 16
• FIG. 19C illustrates a front perspective view of a squeezing portion of the cap member of FIG. 19 A
• FIG. 19D illustrates a back view of the squeezing portion of FIG. 19C
• FIG. 19E illustrates a partially cut-away side view of the squeezing portion of
• FIG. 19C
• FIG. 19F illustrates a side view of a specimen collection portion of the cap member of FIG. 19 A
• FIG. 9G illustrates a front view of the specimen collection portion of FIG. 19F
• FIG. 19H illustrates a partially cut-away side view of the specimen collection portion of FIG. 1 F;
• FIG. 19J illustrates a side view showing coupling of the squeezing portion of FIG.19C with the specimen collection portion of FIG. 19F;
• FIG. 20 illustrates a perspective view of an exemplar ⁇ ' fluid collector usable in the rapid diagnostic test device of FIG. 16;
• FIG. 21 illustrates a partially transparent perspective view of the rapid diagnostic test device of FIG. 16, without test strips or a fluid collector and cap disposed therein;
• FIG. 22 illustrates a perspective view of the top member of FIG. 17A with a test strip disposed therein;
• FIG. 23 illustrates a side view of an exemplary test strip, demonstrating fluid movement therealong
• FIG. 24 illustrates a perspective view of the rapid diagnostic test device of FIG. 16 is use with its cap compressing a fluid collector according to an exemplary embodiment of the present invention
• FIG. 25 illustrates a perspective view of a labeled molecular affinity binding test device in a pre-used condition
• FIG. 26A illustrates a top perspective view of a base of the labeled molecular affinity binding test device of FIG. 25;
• FIG. 26B illustrates a top view of the base of FIG 26 A
• FIG. 26C illustrates a bottom view of the base of FIG. 26A
• FIG. 26D illustrates a left side view of the base of FIG. 26A
• FIG. 26E illustrates a right side view of the base of FIG. 26 A
• FIG. 26F illustrates a back view of the base of FIG . 26 A
• FIG. 26G illustrates a front view of the base of FIG. 26 A
• FIG. 27A illustrates a top perspective view of a cover of the labeled molecular affinity binding test device of FIG, 25,
• FIG. 27B illustrates a top view of the cover of FIG. 27A
• FIG. 27C illustrates a bottom view of the cover of FIG. 27 A
• FIG. 27D illustrates a left side view of the cover of FIG. 27 A
• FIG. 27E illustrates a right side view of the cover of FIG. 27 A
• FIG. 27F illustrates a back view of the cover of FIG. 27A
• FIG. 27G illustrates a front view of the cover of FIG. 27 A
• FIG. 28A illustrates a top perspective view of a cap of the labeled molecular affinity binding test device of FIG. 25;
• FIG. 28B illustrates an end perspective view of the cap of FIG. 28 A
• FIG. 28C illustrates a cross-sectional view of the cap of FIG , 28 A.
• FIG. 29 illustrates an exemplary embodiment of a test strip usable in the test device of FIG. 25.
• a commercial implementation in accordance with the spirit and teachings of the present invention may be configured according to the needs of the particular application, whereby any aspect(s), feature(s), function(s), result(s), component(s), approach(es), or step(s) of the teachings related to any described embodiment of the present invention may be suitably omitted, included, adapted, mixed and matched, or improved and/or optimized by those skilled in the art, using their average skills and known techniques, to achieve the desired implementation that addresses the needs of the particular application.
• the instant embodiments are useful to rapidly determine the presence of an analyte in a liquid sample at a concentration which confirms the condition being tested.
• the sample can include, for example, body fluids, such as whole blood, serum, plasma, urine, spinal fluid, amniotic fluid, mucous, saliva, and the like, or other fluids used in certain food and environmental testing.
• analyte refers to a compound or composition to be measured.
• the analyte can be any substance, such as an antigen or ligand, for which there exists a naturally or genetically occurring specific binding member, for instance, a binding molecule such as an antibody or receptor, and other molecules that exhibit the so-called “lock-in-key” pairing function.
• Analytes also includes any antigenic substances, haptens, antibodies, and combinations thereof.
• the analyte can include a protein; a peptide; an amino acid; a ligand; a hormone; asteroid; a vitamin; a drug, including those administered for therapeutic purposes as well as those administered for illicit purposes; a pathogen; and an exogenious infectious microbe, such as a bacterium, a virus, and metabolites of or antibodies to any of the above substances.
• the analyte can also comprise an antigenic marker or antibody or receptor.
• the signal provided to the user of the device is provided by accumulation of a visually detectable label conjugated to a mobilizable binding member such as a specific antibody and/or antigen, ligand and/or receptor; or the like.
• a mobilizable binding member such as a specific antibody and/or antigen, ligand and/or receptor; or the like.
• This mobilizable binding member is sometimes referred to as a "binding member molecule", “a first affinity binding member”, “labeled binding member” or simply “conjugate”.
• labels that produce a readily detectable signal are used.
• instrumentation may be used to provide a comparative or quantitative representation of the concentration of analyte in the sample.
• test strips described in these embodiments can include regions or pads that may include a dry, porous material.
• porous it is meant that the matrix of material forming the porous structure allows liquids to flow through it.
• sample pad or "fluid collector” means the part of the assay device which is in direct contact with the liquid sample first during test operation, i.e., it receives the sample to be tested for the analyte in question.
• the fluid collector may be made of porous material, such as porous paper, cotton, cellulose, mixed fibers, glass fiber, polyester fiber, and the like.
• conjugate pad refers to the part of the assay device which is in liquid flow contact with the porous material of fluid collector.
• the contact can be an overlap or end-to-end connection, such that the liquid sample can migrate via wicking action or by surface tension-based forces such as capillary forces from the fluid collector through the conjugate pad.
• the conjugate pad comprises a porous material and a mobilizable labeled reagent that is capable of binding the analyte in question to form a labeled reagent-analyte complex which then migrates via liquid flow with the liquid sample along the pad.
• mobilizable as referred to herein means diffusively or non- diffusively attached, or impregnated.
• the mobilizable reagents are capable of dispersing with the liquid sample and carried by the liquid sample in the liquid flow.
• human immunodeficiency virus HIV
• a fluid specimen such as saliva
• HAV human immunodeficiency virus
• DOA food or environmental fluid specimens
• FIGs 1-5 there is shown a diagrammatical illustration of a labeled molecular affinity binding test device J including a cartridge body 21 and a cap 22 made from a generally liquid impermeable durable material such as injection molded plastic.
• the cartridge carries in an internal cavity at least one test strip 23 containing the chemicals necessary to conduct the labeled molecular affinity binding test.
• the strip has an oblong backing 15 made from liquid impermeable material such as plastic extending the entire length of the strip so that liquid can ride along the upper surface of the backing during its flow.
• the internal cavity of the cartridge body is shaped and dimensioned to carry a first portion 17 of the strip including the conjugate pad 26 impregnated with a iyophized, mobilizable, first affinity binding member, such as an HIV antigen or antibody, conjugated to a label such as colloidal gold, and a reaction region 27 including one or more zones 28,29 impregnated with Iyophized, immobilized, second affinity binder members intended to capture first affinity bound molecules.
• first affinity binding members are initially separated from the second affinity binding members.
• the cap 22 can be shaped and dimensioned to engage the cartridge body, and have an internal chamber shaped and dimensioned to enclose a second, remainder portion 16 of the strip including the exposed end of the sample pad 25.
• the device can be delivered in a pre-used condition where the strip has been preloaded into the cartridge and the cap protectively placed over the free end of the strip and held in place by a nib 45 on the cartridge engaging a hole 46 in the cap.
• the user removes the cap 22 so that the device is in the cap open position as shown in FIG. 1, and deposits a liquid sample 24 upon the sample pad 25 at a distal exposed end of the strip 23.
• the sample liquid then fl ows primarily through the forces of capillarity and gravity into a thickened, convexly-shaped
• conjugate pad 26 The liquid will tend toward fully saturating the thickened conjugate pad before any substantial flow leaves the conjugate pad for the reaction region 27.
• the thickened conjugate pad 26 is located beneath a compression structure 36 on the cartridge body 21.
• the compression structure can be formed by a cantilevered beam 38 having a fixed proximal end and a distal free end 42.
• the beam is allowed to deflect downwardly as it comes into contact with the sloped surface of the ramp 32, The downward deflection is facilitated by a narrow isthmus of material 37 connecting the fixed proximal end of the beam to the cartridge body.
• the isthmus acts as a relatively stiff mechanical hinge, providing predetermined resistance to deflection which can be selected during manufacture by selecting the thickness of the isthmus. This helps the beam from being inadvertently deflected prior to the directed intentional placement of the cap.
• a second nib 45 engages the hole 46 on the cap to indicate that the cap has reached the closed position.
• the sloped surface of the ramp 32 of the cap having an angle 33 of between about 0 and 25 degrees progressively forces the cantilevered beam of the compression structure 36 downward as the cap moves toward the closed position.
• the beam presses against the top side of the thickened conjugate pad 26 forcing liquid out of the pad due to an overpressure force an on downstream as indicated by the arrow 47 toward the reaction region 27 carrying one or more result zones 28,29 of immobilized, second affinity binding members.
• the analyte molecules already bound to conjugated first affinity binding members can now bind to the immobilized members located in the zones and accumulate there in significant numbers to indicate a test result through the observation window 19.
• Liquid continues to flow into an absorbent reservoir pad 30 located at the proximal end of the cartridge.
• An empty chamber 31 having an opening 39 outside the cartridge at the proximal end of the cartridge relieves any buildup of backwards pressure against the flow of liquid into the reservoir.
• the chamber can have an opening to the outside to ensure no buildup of pressure occurs during the movement of liquid through the device.
• an amount of desiccant can be placed in the chamber to keep the strip dry until use. As shown in FIG.
• reaction region 27 part of the strip 23 is surrounded on its perimeter 35 by a strip-enclosing constriction structure formed by the close proximity of the cartridge body 21 so that once liquid has reached the reservoir 30, additional liquid is drawn out of the conjugate pad by siphoning forces in combination with the other forces.
• This siphoning force takes over for a diminishing compression force as the beam reaches its full deflection, so that the pressure of the liquid flow is maintained.
• the sample pad, conjugate pad, reaction region, and absorption pad are in direct liquid flow contact with each other such that the direction of liquid flow in the test device is from the sample pad to conjugate pad to reaction region and ultimately to the absorption pad.
• the liquid sample is driven through the strip by a force which is the combination of forces due primarily to compression forces and siphoning, and potentially gravity.
• the compression force 70 is applied progressively along the downstream direction 47 of liquid flow during cap emplacement onto the cartridge body. Before the cap 22 contacts the cartridge body 21 at TO there is no compression force applied. At time Tl , when the cap 22 has been moved more proximaliy, the deflecting the beam 38 generates a compression force having a force component Fd applied to a distal point on the conjugate pad 26 that is greater than zero while the force component Fp at a proximal point remains zero.
• a compression force is applied having a force component Fp applied to the proximal point on the conjugate pad 26 that is greater than zero, while the force component Fd at the distal point is greater than Fp.
• a compression force is applied having a force component Fp and Fd at their maximums, where distal point Fd remains greater than Fp.
• the magnitude of the flow through the reaction region over time 80 is at TO first attributable to surface tension forces (also known as capillarity) alone while the cap remains in the open position. Then as the cap is replaced from Tl to T3 the overall flow through the reaction region is primarily attributable to the compression force. After the cap has been replaced, the flow attributable to the compression force drops off, while the flow attributable to siphoning increases. By T4, the flow is almost entirely driven by siphoning. In this way, the magnitude of the flow through the reaction region is more uniform over a longer period of time because the flow occurs primarily due to overpressure forces during a first time period, and primarily due to siphoning forces during a second, subsequent time period.
• surface tension forces also known as capillarity
• the cap 62 similar to the device of FIG. 1 includes an additional angled bulkhead 63 for directing the distal end 64 of the strip 65 toward a receptacle 66 as the cap is moved from the open position to the closed position.
• the bulkhead forces the end of the strip crumple upon itself into conugations 67 which serve to drive liquid out of the sample pad and downstream into the conjugate pad. This added source of liquid can further pressurize the liquid exiting the conjugate pad.
• the strip crumpling structure can be used alone or in combination with other staictures for driving liquid in a downstream direction on the strip.
• FIG. 10 there is shown an alternate embodiment of the cartridge body 91 having a support shelf 92 supporting the distal end 93 of the strip 94. Further, the top of the conjugate pad 95 is exposed.
• This cartridge body can be used with various progressive compression structures as detailed below.
• FIG. 11 there is shown an alternate embodiment of the progressive compression structure 101 having a deflectable beam 110 having a fixed end 111 secured to the distal end 112 of the cap 113.
• FIG. 12 there is shown an alternate embodiment of the progressive compression structure 102 having a moveable slider 120 mounted within a track 121 on the cap 122.
• the slider has a shoe 123 which bears against the sample pad once the cap is placed in a closed position upon the cartridge body 91.
• the shoe Upon pushing the button of the slider proximal ly toward the proximal end of the cartridge, the shoe progressively imparts a compression force along the sample pad and then the conjugate pad of the strip which forces liquid from the sample pad and conjugate pad toward the reaction region.
• a protective, friction-reducing bib 124 made from a flexible liquid resistant material such as a pliable plastic separates the bottom of the shoe from the strip and facilitates the sliding of the shoe over the strip.
• FIG. 13 there is shown an alternate embodiment of the progressive compression structure 103 having a pressure inducing collapsible bulb 130 made from resiliently flexible, air-tight material such as rubberized plastic formed into the cap 131 .
• a pressure inducing collapsible bulb 130 made from resiliently flexible, air-tight material such as rubberized plastic formed into the cap 131 .
• the application of the progressive compression force has a dramatic effect on micro-flow dynamics in the strip.
• the result is a more rapid and thorough mixing of the sample with the reaction molecules so that a greater and more rapid opportunity is provided for the first and second bindings to occur, and a more even liquid front reaching the sites of second affinity binding.
• the pressurized movement of the liquid sample through the porous material of the conjugate pad 26 causes the liquid front to separate into branches and rejoin from different directions as it courses around the material fibers.
• the convergence from different directions causes a mixing across the liquid front and the liquid that follows as the sample flows downstream 47.
• This enhanced mixing can cause the break-up of clumps of non-anal yte molecules which may carry mobilizable labeled binding members, to reduce false positives.
• the mixing also reduces the differences in the concentratio s of non-analyte molecules and labeled analyte complexes so that they are spread more evenly.
• the liquid prior to the compression force being applied, the liquid has tended to saturate the thickened conjugate pad 26. Once the compression force is applied, the liquid forcefully exits the conjugate pad into a narrower cross-section of the strip entering the reaction region 27. This action increases the velocity of the liquid in the reaction region according to the Bernoulli Principle, reducing its pressure causing further mixing and leading to a more evenly mixed liquid front. Further, because of the thickened shape of the conjugate pad, the direction of flow of the liquid exiting the upper parts of the conjugate pad must make a downward turn 48 to flow into the reaction region. This change in direction also serves to better mix the liquid.
• the concentrations have superior uniformity across the width of the strip which leads directly to giving the labeled analyte complexes a greater opportunity to form the second affinity binding at the immobilized sites in the result zones 28,29 and thereby increasing the overall sensitivity and specificity of the test and reducing false negatives.
• an automated reader 18 can read bv reflected light the result of the test and generate an electronic signal that can be forwarded to a computer for further analysis and distribution to a data network.
• the computer can be implemented using a mobile phone device running the appropriate software, for example.
• the intensity of the lines in the result zones can indicate a quantitative result.
• the automated reader can the detect not just whether a line has appeared or not, but rather the intensity of the line, and digitize that intensity reading. That reading corresponds directly with the amount of analyte present in the sample, providing a digitized quantitative result.
• a device 51 can include a second window 55 located beneath the result zones 56,57 so that a light emitter 54 can shine light through the reaction region to be received by the reader 52 and the mobile phone analysis tool 53.
• the entire cartridge can be made from translucent material.
• a rapid diagnostic test device 210 can include a top member 212 connected to a bottom member 214.
• One or more test strips 270 may be disposed inside the test device 210 between the top member 212 and the bottom member 214.
• a result window 216 may be formed in at least one of the top member 212 and the bottom member 214 to allow a user to view the results of the test. As described in greater detail below, the result window 216 can align with one or more strip lines 274 (see FIG. 22) of the test strip 270.
• a cap 218 may be slidably and removably disposed on one end of the test device 210. During use of the test device 210 to test a sample for an analyte, the cap 218 is slid onto the end of the test device 210 and a fluid collector 220, disposed within and extending from an inlet 260 (see FIG. 21) of the test device 210, may be compressed to drive sample fluid onto and through the test strips 270, as described in greater detail below.
• the top member 212 is shown in detail, without the bottom member 214 attached thereto.
• the top member 222 can include a press pad 222 adapted to align with a conjugate color pad 272 and strip press pad 278 of the test strip 270 (see FIG. 23).
• a fluid directing channel 224 is formed at one end of the top member 212.
• the fluid directing channel 224 is bounded on each side by side walls 226 and terminates at the press pad 222.
• the fluid directing channel 224 may direct fluid from the fluid collector 220 toward the conjugate color pad 272 of the test strip 270.
• a top member result window 216A may be disposed in the top member 212.
• the top member result window 216A may be formed from a clear or opaque material, allowing a user to read results on the test strip 270 disposed within the test device 210.
• the bottom member 214 is shown in detail, without the top member 212 attached thereto.
• the bottom member 214 includes a fluid directing channel 238 that aligns with the fluid directing channel 224 of the top member 212 to receive the fluid collector 220 therein.
• the fluid directing channel 238 of the bottom member 214 can be bounded on each side by side walls 237.
• a plurality of side bars 224 can define strip slots 235 for disposing the test strips 270.
• the side bars 224 may be disposed adjacent to the inner terminus of the fluid directing channel 238.
• a plurality of upper side bars 232 may be disposed on an opposite end (opposite the plurality of side bars 224) of the bottom member.
• the plurality of upper side bars 232 may align with the plurality of side bars 224 so that the test strips 270 are disposed within the test device 210 adjacent to each other and generally parallel with each other, as shown in FIG. 16.
• the bottom member 214 can include a plurality of secure/alignment holes 239 to receive secure/alignment pins 229 of the top member 212 when the top member 212 is attached to the bottom member 214.
• Side clips 236 m ay be disposed on each side of the bottom member 214.
• the side clips 236 may fit into connection notches 228 of the top member 212 to removably secure the top member 212 to the bottom member 214.
• connections may include friction fit, fasteners, twist lock connectors, or the like.
• the cap 218 is shown in greater detail.
• the cap 218 may be configured to fit onto the end of the test device 210 as shown in FIG. 16.
• a top notch plate 242 and a bottom notch plate 244 may be formed in the cap 218.
• the notch plates 242, 244 may be disposed directly opposite each other, as shown, or, in some embodiments, may be offset.
• the notch plates 242, 244 may be formed in various shapes and sizes and typically protrude into an interior region of the cap 2 8 to press against the fluid collector 220, as discussed in greater detail below. In some
• the cap 218 may sealingly engage the top member 212 and the bottom member 214 such that excess fluid in the cap 218 may not leak out while the cap is disposed on the test device 210.
• the cap 218 may be formed from a specimen retention portion 320 and a fluid collector squeezing portion 300 (also referred to simply as squeezing portion 300), FIGs 19C to 19E show views of the squeezing portion 300.
• the squeezing portion 300 can include an outer body 302 having a fluid collector opening 304 at one end thereof. Side walls 306 may be disposed inside of the opening 304 to provide a stop against the device 210. This stopping action can help assure the user that the cap 218 is properly placed onto the device 210 before squeezing the squeezing portion 300.
• a back side 310 of the squeezing portion 300 may be solid or fluid
• the squeezing portion 300 may be formed at least partially from a resiliently deformable material that may be squeezed together to reduce the volume inside the fluid collector opening 304. Referring now to FIGs.
• the specimen retention portion 320 may include a solid front panel 324 that aligns with the back side 3 0 of the squeezing portion 300.
• a retention portion opening 326 may be formed in the front panel 324 of the specimen retention portion 320. The retention portion opening 326 may align with the specimen collection opening 308 of the squeezing portion when the cap 218 is assembled as shown in FIG. 19A.
• the retention portion opening 326 may be formed as a oneway valve, where specimen is permitted into the specimen retention portion 320 when the specimen retention portion 320 is attached to the squeezing portion 300, but, when detached, the retention portion opening 326 may automatically seal to prevent specimen from spilling from the specimen retention portion 320.
• Alignment pins 322 may coordinate with alignment pins 314 of the squeezing portion (see FIG. 19E) when the squeezing portion 300 is assembled with the specimen retention portion 320 as shown in FIG. 19J.
• the specimen retention portion 320 may be formed separately from the squeezing portion 300.
• the cap 218, including the specimen retention portion 320 and the squeezing portion 300 may be formed integrally, as a single component.
• the fluid collector 220 may be formed of various materials and shapes, as described above, that can collect and contain a liquid sample.
• the fluid collector 220 is formed from a porous, deformable material such that, when depressed by the cap 218, the fluid collector 220 may release at least a portion of the fluid (sample) contained therein toward the conjugate color pad 272 of the test strip 270.
• test device 210 the use of the test device 210 will be described according to an exemplary embodiment of the present invention.
• a sample such as a body fluid
• saliva may be collected from a person onto the fluid collector 220.
• the fluid collector 220 may be already held in the inlet 260 of the test device 210 while the sample is obtained.
• the sample may be placed onto the fluid collector 220 and then the fluid collector 220 may be placed into the inlet 260 of the test device 210.
• the fluid collector 220 may only press against the inlet 260 of the test device 210 and compression of the fluid collector 220 may drive fluid into the fluid directing channel 224, 238. Compression of the fluid collector 220 may be achieved by various manners.
• sliding the cap 218 onto the device 210 may compress the fluid collector 220.
• the squeezing portion 300 of the cap 218 may be squeezed to drive fluid out of the fluid collector 220 and into the inlet 260 of the test device 210.
• test strips 270 may be disposed in the test device 210.
• the test strips 270 can include a substrate 276 onto which a porous material 274 is disposed.
• Each test strip 270 may include a plurality of strip lines 274 that may indicate the presence or absence of a particular substance.
• each test strip 270 may test for a plurality of substances.
• each test strip 270 may be capable of testing for five substances. Therefore, when the test device 210 is designed to hold three test strips 270, as shown, such a test device may be capable of testing for 15 substances.
• the conjugate color pad 272 may be disposed below the press pad 222 of the top member 212.
• a strip press pad 278 may be formed as part of the test strip 270. As the cap 218 is slid onto the test device 210, the cap 218 may squeeze the top member 212 toward the bottom member 214, causing the press pad 222 of the top member to press downward onto the strip press pad 278 and/or the conjugate color pad 272.
• the sample collected in the fluid collector 220 may be forced out of the fluid collector 220 by sliding the cap 2 8 onto the end of the test device 210, where the notch plates 242, 244 (see also, FIGs 19A and 19B) compress the fluid collector 220 as shown in FIG. 24.
• the sample is forced to flow into the fluid directing channel 224, 238 toward the conjugate color pad 272 (see FIGs 18 A, 18B and 22). Excess sample from the fluid collector 220 may be reserved on the bottom of the cap 218 for further testing needs.
• the strip press pad 278 may play the role as an auxiliary function to drive chemical mixtures, pre-impregnated on the conjugate color pad 272, out of the conjugate color pad 272 completely.
• the conjugate color pad 272 provides a source of mobiiizable first affinity binding members 280 which may bind with substances in the sample to form a reaction component 282.
• the strip lines 274 of the test strip 270 can include fixed second affinity binding sites that may react with the reaction component 282 to provide a readable output, indicating the presence or absence of the substance.
• the driven flow mechanism of the test device 210 can significantly expedite testing time to about one minute, for example, which is typically about 5 to 20 times faster than conventional rapid test devices.
• the test device 210 of the present invention may be used to provide a quantitative result.
• the result window 216 may be formed in both the top member 212 and the bottom member 214, similar to that shown in FIG, 14, thereby allowing a user or a reading device to view the test strip 270 from both sides thereof.
• a mobile communication device such as a smart phone
• a smart phone may be used, as disclosed in Ozcan et al., U.S. patent number 8,916,390, incorporated herein by reference, to automatically scanned the test strip 270 via the camera of a smart phone.
• the scanned image can then be interpreted by software to obtain a result and deliver that result to a wireless network, for example.
• test device 210 described above with respect to FIGs 16 through 24 may incorporate one or more of the features disclosed in the test device 1 described above with respect to FIGs 1 through 15,
• FIG, 25 there is shown an assembled view, in a pre-used condition, of a labeled molecular affinity binding test device 350, or simply test device 350, including a base 320 receiving one or more test strips 3 10 therein, typically a single test strip 310, a cover 330 fitting over the base 320, and a cap 340, fitting over an end of the test device 350.
• the base 320, cover 330 and cap 340 may be made from a generally liquid impermeable durable material such as injection molded plastic.
• the test device 350 has an internal cavity for receiving at least one test strip 310 containing the chemicals necessary to conduct the labeled molecular affinity binding test.
• the strip 310 has an elongated backing 315 made from liquid impermeable material such as plastic extending the entire length of the strip so that liquid can ride along the upper surface of the backing 315 during its flow.
• a first portion of the test strip 310 includes a conjugate pad 312 impregnated with a lyophized, mobilizable, first affinity binding member, such as an HIV antigen or antibody, conjugated to a label such as colloidal gold, and a reaction region including one or more zones 314, 316 impregnated with lyophized, immobilized, second affinity binder members intended to capture first affinity bound molecules.
• the first affinity binding members are initially separated from the second affinity binding members.
• the cap 340 can be shaped and dimensioned to engage the assembled base 320 and cover 330,
• the test device 350 can be delivered in a pre-used condition where the test strip 310 has been preloaded therein and the cap 340 protectively placed over the test device 350 just before reaching the sampling well 332 (see FIG. 25).
• the base 320 can include one or more strip support bars 322 for supporting the test strip 310 thereupon.
• a compression cushion 324 may be disposed inside the base 320 to coincide with a location of the conjugate pad 312 of the test strip 3 10.
• a sample blocking bar 326 may be disposed at a rear end 321 of the base 320. The sample blocking bar 326 may be used to direct a sample toward the compression cushion 324 and, accordingly, toward the conjugate pad 312 of the test strip.
• One or more pin holes 328 may be disposed typically toward a front end 323 of the base for attaching the cover 330 thereto.
• the cover 330 can include the sampling well 332 for receiving a sample therein.
• the sampling well 332 When a sample is introduced into the sampling well 332, the sample is in fluid contact with the porous material 317 of the test strip 310.
• a sampling pad (not shown) may be incorporated into the sampling well 332 to absorbently receive a sample introduced through the sampling well 332.
• the sampling well 332 may be disposed adjacent a rear end 331 of the cover 330, opposite the front end 333 thereof.
• a window 336 may be formed in the cover 330 to permit visual or instrument inspection of a test strip 310 disposed in the test device 350.
• the window 336 may be formed as a through hole in the cover 330 or may be formed as a translucent or transparent region in the cover 336.
• a ventilation window 339 may be formed in the cover 330 to permit air circulation between an interior and an exterior of the test device 350.
• One or more securement pins 338 may extend from a bottom surface of the cover 330.
• the securement pins 338 may fit into pin holes 328 (see FIG. 26A) of the base 320 to form the test device 350.
• pin holes 328 see FIG. 26A
• other securement mechanisms are contemplated within the scope of the present invention, such as screws, twist locks, friction fit edges, or the like.
• the cover 330 may include
• compression bars 334 that align with the compression cushion 324 of the base 320.
• the conjugate pad 312 of the test strip 310 may be disposed between the compression bars 334 and the compression cushion 324 in the assembled test device 350.
• a sample may be disposed in the sampling well 332, causing the sample to contact the porous portion 317 of the test strip.
• the cap 340 may be slid over the rear ends 321, 331 of the assembled base 320 and cover 330.
• a ramp 342, also referred to as a compression pad 342, may be disposed along an upper surface of the cap 340, causing a reduced interior height of the cap 340 from the open end of the cap 340 toward the closed end thereof. Accordingly, the ramp 342 may press against the cover 330 with increased pressure as the ramp 342 is slid over the assembled test device 350.
• the cover 330 may be permitted to bend toward the base 320, causing the sample absorbed on the porous portion 317 of the test strip 310 to be forced up the test strip, through the conjugate pad 3 2 which contains a source of mobiiizable first affinity binding members.
• the downward deflection of the cover 330 also presses the compression bars 334 of the cover 330 toward the compression cushion 324 of the base 320, squeezing the sample through the conjugate pad 312 and up the test strip 3 0 at a rate from about 5 to about 20 times faster than conventional test strips using capillary action for sample movement up the test strip.
• the resulting mixture moves along the test strip through a reaction region 313 toward one or more fixed second affmity binding sites 314, 316 in a reaction region of the test strip 310.
• This reaction region may be visible through the window 336 of the test device 350 to permit a user to visually read the test strip 310 to obtain a test result.
• the application of the progressive compression force has a dramatic effect on micro-flow dynamics in the strip.
• the result is a more rapid and thorough mixing of the sample with the reaction molecules so that a greater and more rapid opportunity is provided for the first and second bindings to occur, and a more even liquid front reaching the sites of second affinity binding.
• the pressurized movement of the liquid sample through the porous material of the conjugate pad 3 12 causes the liquid front to separate into branches and rejoin from different directions as it courses around the material fibers.
• the convergence from different directions causes a mixing across the liquid front and the liquid that follows as the sample flows downstream the test strip 310.
• This enhanced mixing can cause the break-up of clumps of non-analyte molecules which may carry mobilizable labeled binding members, to reduce false positives.
• the mixing also reduces the differences in the concentrations of non-analyte molecules and labeled analyte complexes so that they are spread more evenly.
• the concentratio s have superior uniformity across the width of the strip which leads directly to giving the labeled analyte complexes a greater opportunity to form the second affinity binding at the immobilized sites 314, 316 in the result zones and thereby increasing the overall sensitivity and specificity of the test and reducing false negatives.
• a predi cable amount of reactable sample liquid has passed through the conjugate pad 312 and through the reaction region. This amount is typically about 100 to 300 microliters.
• an automated reader can be used to read, via, for example, reflected light, the result of the test and generate an electronic signal that can be forwarded to a computer for further analysis and distribution to a data network.
• the computer can be implemented using a mobile phone device running the appropriate software, for example.
• the intensity of the lines in the result zones can indicate a quantitative result.
• the automated reader can the detect not just whether a line has appeared or not, but rather the intensity of the line, and digitize that intensity reading. That reading corresponds directly with the amount of analyte present in the sample, providing a digitized quantitative result.
• the test device can include a second window in the base 320, located beneath the window 336 in the cover, so that a light emitter can shine light through the reaction region to be received by a reader and a mobile phone analysis tool.
• the entire cartridge can be made from translucent material.
• a mobile communication device such as a smart phone
• a mobile communication device such as a smart phone
• the scanned image can then be interpreted by software to obtain a result and deliver that result to a wireless network, for example.
• the test device 350 described above with respect to FIGS 25 through 29 may incoiporate one or m ore of the features disclosed in the test device 1 described above with respect to FIGS 1 through 15 and the test device 210 described above with respect to FIGS 16 through 24,

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