CA2199823A1 - Assay devices with non-woven sample collection zone - Google Patents
Assay devices with non-woven sample collection zoneInfo
- Publication number
- CA2199823A1 CA2199823A1 CA002199823A CA2199823A CA2199823A1 CA 2199823 A1 CA2199823 A1 CA 2199823A1 CA 002199823 A CA002199823 A CA 002199823A CA 2199823 A CA2199823 A CA 2199823A CA 2199823 A1 CA2199823 A1 CA 2199823A1
- Authority
- CA
- Canada
- Prior art keywords
- wick
- woven fabric
- fabric material
- fibres
- assay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
-
- 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
-
- 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
- G01N33/52—Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper and including single- and multilayer analytical elements
- G01N33/521—Single-layer analytical elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/16—Reagents, handling or storing thereof
-
- 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
- B01L2300/0816—Cards, e.g. flat sample carriers usually with flow in two horizontal directions
-
- 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
- B01L2300/16—Surface properties and coatings
- B01L2300/161—Control and use of surface tension forces, e.g. hydrophobic, hydrophilic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/805—Test papers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/97—Test strip or test slide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S436/00—Chemistry: analytical and immunological testing
- Y10S436/807—Apparatus included in process claim, e.g. physical support structures
- Y10S436/81—Tube, bottle, or dipstick
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S436/00—Chemistry: analytical and immunological testing
- Y10S436/811—Test for named disease, body condition or organ function
- Y10S436/814—Pregnancy
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Chemical & Material Sciences (AREA)
- Hematology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Urology & Nephrology (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- General Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Cell Biology (AREA)
- Biochemistry (AREA)
- Biotechnology (AREA)
- Microbiology (AREA)
- Pathology (AREA)
- Clinical Laboratory Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Sampling And Sample Adjustment (AREA)
- Nonwoven Fabrics (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
An assay device comprises a sample-collecting wick made from non-woven fabric material laminated to plastics sheet. Preferably, the fabric is a 30:70 blend of viscose and polyester, and has a fibrous structure in which more than twothirds of the fibres run substantially parallel to the intended direction of liquid flow in the wick.
Description
- W096/09~6 PCT~P9S/03722 ASSAY DEVICES WITH NON-WOVEN SAMPLE COLLECTION ZONE.
FT~T-n OF TP~ INv~ lON
This invention relates to assay devices.
BACRGROU~n OF T~ V~:~L ~ON
Many assay devices are designed to be "self-sampling" so that the user merely needs to contact the device with a liquid sample such as a body fluid in order to initiate the assay procedure. In many such devices this is the only action that the user needs to perform before the result of the assay becomes visible or readable. Many of such devices are based on the principle of "immunochromatography" in which the device contains a strip of porous carrier material along which the applied liquid sample can move. While such movement is occurring, one or more reagents within the device are carried into a detection zone on the strip and cause the assay result to be revealed. Commonly a labelled material is mobile within the strip when moist and the binding of this labelled material in the detection zone provides the means whereby the assay result becomes readable. Examples of such devices are described in EP 291 194 and EP 383 619.
The "self-sampling" facility can be provided by means of a bibulous sample receiving member or "wick". The material from which the wick is made is chosen such that applied liquid is absorbed very rapidly into the w ~. The wick then acts as a reservoir of samplc liquid which feeds progressively into the porous s =ip to drive the immunochromatographic process. The mobile labelled reagent may be incorporated in the strip itself or elsewhere within the device, upstream from the detection zone. In EP 291 194 it is suggested that the labelled reagent can be incorporated in the wick. Ideal labelled reagents useful W096/09546 2 1 9 9 8 2 3 PCT~P95/03722 in these assay devices are reagents (generally specific binding reagents) labelled directly or indirectly with solid water-insoluble particulate direct labels such as dye sols, metallic (eg. gold) sols, non-metallic elemental particles such as selenium and carbon, and other minute coloured particles such as coloured latex (polystyrene) particles, all known per se for this purpose.
SUMM~RY OF T~ INVENTTON
The present invention provides an improved assay device in which the wick comprises non-woven fabric.
Preferred non-woven material is made by the process known as hydroentanglement. Ideally no chemical treatment or chemical curing is used during the manufacturing process.
Such materials are already known per se and are widely used to make cleaning cloths and wipes.
For the purposes of the invention the non-woven wick material is preferably hydrophilic. If the overall character of the fabric is hydrophobic, it can be treated for example with surface active agent to render it hydrophilic in use. It will usually be made from a blend of fibres. This blend can be a mixture of hydrophobic fibres and hydrophilic fibres, but the overall character of the material preferably hydrophilic. An ideal blend comprises a mixture of viscose and polyester. Preferably, the blend is about 30~ viscose and about 70~ polyester.
An important preferred aspect of the invention is that the wick should comprise only a single sheet or layer of the non-woven fabric. This considerably facilitates manufacture and quality control of an assay device when the wick is used to contain one or more reagents important to the assay chemistry, such as a mobile labelled reagent. If the wick is constructed of multiple layers of bibulous material, it W096/09~6 2 1 9 9 8 2 3 PCT~P9~/03722 is difficult to ensure that the reagent(s) are deposited consistently in the wick during manufacture, and flow of sample liquid through the multi-layer structure may be uneven, and lead to inefficient or variable uptake of the reagent(s).
In order to constitute an effective wick when used in an immunochromatographic assay device, the wick should have sufficient absorptive capacity. The wick liquid capacity should exceed the capacity of the strip (together with any sink at the distal end of the strip, if provided). The "weight" of the non-woven material is importan'. The weight of the material is preferably at least abou~ 50 g/m2, and more preferably at least about 70 g/m2. Generally it is not necessary for the weight to exceed about 120 g/m2.
Preferably, the non-woven fabric layer is bonded to a supporting layfr of non-water-absorbent material, such as plastics sheet. Polyester sheet is ideal. Bonding can readily be achieved using a variety of adhesives, known per se in the lamination art, the adhesion step being induced by pressure, heat or the use of two-component adhesives.
It is self-evident that the quantity and nature of the adhesive should not significantly impair the absorbency and flow properties of the non-woven fabric when bonded to the support. Neither should the adhesive contain any reagents, such as unreacted excess monomers, in amounts that c~uld interfere with the efficiency of the specific binding or other reactions that must occur within the assay device during use.
Although the fabric materials used in this invention are conventionally described as being "non-woven", this does not necessarily mean that the fibres that make up such fabric are arranged in a totally random manner. It is generally found, as a result of the process by which the fabric is made, that a distinct proportion of the fibres W096/09546 2 1 9 9 8 2 3 PCT~P95/03722 lie predominately in one direction and that the remainder lie predominately in a direction at right angles to the first direction. In constructing a device in accordance with the invention, the non-woven fabric is preferably selected and arranged such that the majority of the fibres lie parallel to the direction in which liquid should flow along the wick into the device. Preferably, the numerical ratio of flow-parallel fibres to flow-orthogonal fibres should be about 2:1 or greater, provided that there are sufficient flow-orthogonal fibres present to maintain the mechanical integrity of the non-woven material for manufacturing purposes.
If desired, the wick can incorporate components that assist the performance of the assay, such as buffering agents and surfactants.
Use of a wick made from non-woven fabric material of the preferred weight as described above, leads to much improved wicking properties and to very efficient release of any dried labelled reagent which may be incorporated in the wick.
B~T~F D~SCRIPTTON OF T~ DRAWTNGS
The accompanying drawings illustrate, by way of example only, an assay device constructed according to the invention:
Figure 1 shows a general view of the device exterior.
Figure 2 shows an "exploded" view of the device of Figure 1.
Figure 3 shows a longitudinal cross-sectional elevation of the device of Figure 1.
W096/09546 2 t 9 9 8 2 3 PCT~P95/03722 Figure 4 shows the detailed construction of a wick in accordance with the invention.
DT'TATTT~'n DTS~TOSURE OF T~T~' INv~:NllON
Referring to Figure 1, the device comprises a substantially rectangular elongate casing 100 formed from upper and lower halves 101 and 102. Typically, the two halves of the casing will be moulded from plastics material or similar water-impervious material. The upper surface 103 of the casing (as seen in Figure 1) incorporates an aperture or window 104 through which the interior of the casing can be viewed. Projecting from the left hand end 105 of the casing is a wick 106. The wick comprises an upper layer 107 of non-woven fabric material, bonded to a supporting layer 108 of plastics material such as polyester sheet.
Referring to Figure 2 which shows an exploded view of the device, the contents of the casing comprise an assay strip 200, a sink 201 and the non-exposed portion 202 of wick 106.
The assay strip 200 comprises a narrow rectangular strip 203 of porous material, such as nitrocellulose sheet, bonded to a supporting strip 204 of identical rectangular dimensions. Supporting strip 204 can be of plastics material or similar moisture-impervious material which will not affect the flow of moisture along the strip in use.
The supporting strip can be transparent or translucent, so that the assay strip can be viewed through it. The assay strip can be placed against the interior of the casing adjacent aperture 104, the moisture-impervious supporting strip being used to inhibit ingress of moisture via the aperture.
The assay strip includes one or more detection zones within which the assay result is revealed by the formation or WO9G/03516 - 2 1 9 9 8 2 3 PCT~P95/03722 -accumulation of a detectable reagent such as a coloured label which reveals the zone as a line, spot or other symbol. If desired, the assay strip can also include a control zone (generally downstream from the detection zone) to indicate to the user that the test has been performed correctly. These zones are not shown in the drawings, but will be in the region of the strip generally indicated by the letter A in Figure 2, and therefore visible from the exterior of the casing through aperture 104. The assay strip and supporting strip are pierced by a locating hole 205.
Sink 201 can comprise any moisture-absorbent material having sponge-like properties to take up excess fluid that has progressed along the assay strip.
Wick 106 extends for a considerable distance inside the casing, and includes a region 206 towards its right hand end in which a labelled mobile component has been pre-dosed and awaits the presence of sample liquid in the wick which will render the labelled reagent mobile and transfer it elsewhere within the device. The wick is also pierced by a locating hole 207.
Lower half 102 of casing 100 acts as a tray to accomodate the various internal components. The lower half of the casing is provided with two pins or pegs 208 and 209 which extend upwards from the floor 210 of the casing. During manufacture, wick 106 is placed in the lower casing and located in a predetermined place by pin 208 passing through hole 207. The sink 201 is placed at the opposite end of the casing. The assay strip is placed over these components and located in a predetermined place by allowing pin 209 to pass through hole 205.
Referring to Figure 3, which shows a cross-section of the W096/09546 2 1 9 9 8 2 3 PCT~P95/03722 fully assembled device, it can be seen that the assay strip 203 overlaps the right hand end 300 of the wick 107 so that liquid can flow along the length of the wick and then into the left hand end 301 of the assay strip. The right hand end 302 of the assays strip overlaps the sink 201.
Therefore there is a continuous liquid flow-path from the exposed left hand portion 303 of the wick through to the sink. The upper and lower halves of the casing provide a tight seal against the wick so that moisture cannot enter the device other than by flowing through the wick material itself.
It will be appreciated that the device as illustrated in these drawings and as just described, can be modified very considerably without departing from the scope of the invention. Th_ proportions and overall shape of the casing and other comp~nents can be altered and is largely a matter of asthetics. More than one aperture or window can be provided. The sink is an optional feature and can be discarded if the downstream portion of the assay strip has sufficient liquid capacity. It will also be appreciated that the manner in which the components within the casing are held in place is not crit_cal to the invention, and the arrangement as shown in the drawings is provided purely by way of example.
The general construction of a wick in accordance with the invention is illustrated, by way of example, in Figure 4 of the accompanying drawings. This figure shows a layer 400 of non-woven fabric material bonded to a supporting layer 401 of plastics sheet. The non-woven fabric has a fibrous structure 402. The wick is of rectangular form and tne majority of the fibres making up the non-woven material lie substantially parallel to the long axis of the wick.
Ar acent one end of the wick is a broad line 403 of deposited labelled reagent (represented by dots although wo 96,09546 2 1 9 9 8 2 3 PCT~P95/03722 the individual labelled components will not be seperately visible to the human eye). The line runs across the width of the wick. The cut edge 404 of the wick reveals that the labelled component is substantially on the surface of the wick. Deposition of the labelled reagent in this manner can readily be achieved, for example, by glazing the strip material prior to application of the labelled reagent.
li~XAMPT.F~
The following Example demonstrates the improved properties of a wick made in accordance with the invention.
An assay device as generally described above with reference to the accompanying drawings is constructed as follows:
The device is intended to detect the presence of luteinizing hormone (LH) in urine for the purposes of an ovulation detection test. The wick is made from a commercially available non-woven fabric material consisting of a blend of viscose/polyester (30:70) having a weight of 70gsm. The fabric is selected such that its fibrous structure is distinctly directional, with more than two thirds of the fibres running substantially parallel to one dimension. The non-woven material is infused with an aqueous Tris buffer containing by weight about 0.01~ Tween 20 detergent. After drying, the non-woven material is laminated onto a polyester backing sheet of thickness about 175 ~m, using a heat-sensitive adhesive. A reagent comprising anti-LH monoclonal antibodies adsorbed onto latex (polystyrene) spheres of diameter about 0.3 ~m is deposited as a broad line on the non-woven material using an airbrush, as generally described in EP 291194.
Subsequent mobility (under the influence of urine) of the deposited labelled reagent is enhanced by pre-treatment of the non-woven material with sucrose or other sugar to form - W096/09546 2 1 9 9 8 2 3 PCT~P95/03722 a glaze in the region to which the latex-labelled reagent is to be applied. Alternatively, the sucrose or other sugar can be included in the deposition buffer with the labelled reagent. This is also described in greater detail in EP 291194. The line of deposited labelled reagent is orthogonal to the direction in which the fibres in the non-woven material predominantly lie.
After reagent deposition, the laminated wick is cut mechanically into strips 6 mm wide and of length about 55 mm. The long axis of the cut strip is parallel to the direction in which the majority of fibres run. The line of deposited labelled material therefore runs across the strip, and the strip is cut such that the line of deposited labelled material is adjacent one end of the strip.
Polyester-backed nitrocellulose sheet of pore size approximately 8~ is converted into immunochromatographic test strips, as generally described in EP 291194, by the deposition of a line of anti-LH monoclonal antibody by a microsyringe and subsequent blocking of the nitrocellulose using polyvinyl alcohol. The treated nitrocellulose sheet is cut into test strips of width 6 mm and length about 40 mm.
The test strip and the wick are assembled within a two-part polystyrene casing in the manner described above with reference to the drawings. The casing also contains a sink comprising a pad of conventional filter paper. The test line which runs across the test strip is situated beneath the aperture in the casing.
If desired, the test strip can also incorporate a control zone (for example downstream from the detection zone) which may comprise, for example, a deposited line of anti-species antibody (such as an anti-mouse monoclonal antibody if the W096/09546 PCT~P95/03722 labelled reagent comprises a murine monoclonal).
Contact of the exposed portion of the wick with a urine sample (eg. a urine stream) causes immediate saturation of the non-woven material. The labelled reagent (protected within the casing from being washed out of the wick by contact with the external sample) is released into suspension by the absorbed urine, and the urine migrates by capillary action from the wick along the length of the nitrocellulose strip and into the sink. The labelled reagent is carried with the migrating urine. If the urine contains LH, a sandwich reaction occurs and the labelled reagent can become bound in the detection zone to reveal the presence of LH.
In a device constructed as just described, it is found that release of the deposited labelled reagent is rapid and effective and the sensitivity and reliability of the assay result is enhanced.
FT~T-n OF TP~ INv~ lON
This invention relates to assay devices.
BACRGROU~n OF T~ V~:~L ~ON
Many assay devices are designed to be "self-sampling" so that the user merely needs to contact the device with a liquid sample such as a body fluid in order to initiate the assay procedure. In many such devices this is the only action that the user needs to perform before the result of the assay becomes visible or readable. Many of such devices are based on the principle of "immunochromatography" in which the device contains a strip of porous carrier material along which the applied liquid sample can move. While such movement is occurring, one or more reagents within the device are carried into a detection zone on the strip and cause the assay result to be revealed. Commonly a labelled material is mobile within the strip when moist and the binding of this labelled material in the detection zone provides the means whereby the assay result becomes readable. Examples of such devices are described in EP 291 194 and EP 383 619.
The "self-sampling" facility can be provided by means of a bibulous sample receiving member or "wick". The material from which the wick is made is chosen such that applied liquid is absorbed very rapidly into the w ~. The wick then acts as a reservoir of samplc liquid which feeds progressively into the porous s =ip to drive the immunochromatographic process. The mobile labelled reagent may be incorporated in the strip itself or elsewhere within the device, upstream from the detection zone. In EP 291 194 it is suggested that the labelled reagent can be incorporated in the wick. Ideal labelled reagents useful W096/09546 2 1 9 9 8 2 3 PCT~P95/03722 in these assay devices are reagents (generally specific binding reagents) labelled directly or indirectly with solid water-insoluble particulate direct labels such as dye sols, metallic (eg. gold) sols, non-metallic elemental particles such as selenium and carbon, and other minute coloured particles such as coloured latex (polystyrene) particles, all known per se for this purpose.
SUMM~RY OF T~ INVENTTON
The present invention provides an improved assay device in which the wick comprises non-woven fabric.
Preferred non-woven material is made by the process known as hydroentanglement. Ideally no chemical treatment or chemical curing is used during the manufacturing process.
Such materials are already known per se and are widely used to make cleaning cloths and wipes.
For the purposes of the invention the non-woven wick material is preferably hydrophilic. If the overall character of the fabric is hydrophobic, it can be treated for example with surface active agent to render it hydrophilic in use. It will usually be made from a blend of fibres. This blend can be a mixture of hydrophobic fibres and hydrophilic fibres, but the overall character of the material preferably hydrophilic. An ideal blend comprises a mixture of viscose and polyester. Preferably, the blend is about 30~ viscose and about 70~ polyester.
An important preferred aspect of the invention is that the wick should comprise only a single sheet or layer of the non-woven fabric. This considerably facilitates manufacture and quality control of an assay device when the wick is used to contain one or more reagents important to the assay chemistry, such as a mobile labelled reagent. If the wick is constructed of multiple layers of bibulous material, it W096/09~6 2 1 9 9 8 2 3 PCT~P9~/03722 is difficult to ensure that the reagent(s) are deposited consistently in the wick during manufacture, and flow of sample liquid through the multi-layer structure may be uneven, and lead to inefficient or variable uptake of the reagent(s).
In order to constitute an effective wick when used in an immunochromatographic assay device, the wick should have sufficient absorptive capacity. The wick liquid capacity should exceed the capacity of the strip (together with any sink at the distal end of the strip, if provided). The "weight" of the non-woven material is importan'. The weight of the material is preferably at least abou~ 50 g/m2, and more preferably at least about 70 g/m2. Generally it is not necessary for the weight to exceed about 120 g/m2.
Preferably, the non-woven fabric layer is bonded to a supporting layfr of non-water-absorbent material, such as plastics sheet. Polyester sheet is ideal. Bonding can readily be achieved using a variety of adhesives, known per se in the lamination art, the adhesion step being induced by pressure, heat or the use of two-component adhesives.
It is self-evident that the quantity and nature of the adhesive should not significantly impair the absorbency and flow properties of the non-woven fabric when bonded to the support. Neither should the adhesive contain any reagents, such as unreacted excess monomers, in amounts that c~uld interfere with the efficiency of the specific binding or other reactions that must occur within the assay device during use.
Although the fabric materials used in this invention are conventionally described as being "non-woven", this does not necessarily mean that the fibres that make up such fabric are arranged in a totally random manner. It is generally found, as a result of the process by which the fabric is made, that a distinct proportion of the fibres W096/09546 2 1 9 9 8 2 3 PCT~P95/03722 lie predominately in one direction and that the remainder lie predominately in a direction at right angles to the first direction. In constructing a device in accordance with the invention, the non-woven fabric is preferably selected and arranged such that the majority of the fibres lie parallel to the direction in which liquid should flow along the wick into the device. Preferably, the numerical ratio of flow-parallel fibres to flow-orthogonal fibres should be about 2:1 or greater, provided that there are sufficient flow-orthogonal fibres present to maintain the mechanical integrity of the non-woven material for manufacturing purposes.
If desired, the wick can incorporate components that assist the performance of the assay, such as buffering agents and surfactants.
Use of a wick made from non-woven fabric material of the preferred weight as described above, leads to much improved wicking properties and to very efficient release of any dried labelled reagent which may be incorporated in the wick.
B~T~F D~SCRIPTTON OF T~ DRAWTNGS
The accompanying drawings illustrate, by way of example only, an assay device constructed according to the invention:
Figure 1 shows a general view of the device exterior.
Figure 2 shows an "exploded" view of the device of Figure 1.
Figure 3 shows a longitudinal cross-sectional elevation of the device of Figure 1.
W096/09546 2 t 9 9 8 2 3 PCT~P95/03722 Figure 4 shows the detailed construction of a wick in accordance with the invention.
DT'TATTT~'n DTS~TOSURE OF T~T~' INv~:NllON
Referring to Figure 1, the device comprises a substantially rectangular elongate casing 100 formed from upper and lower halves 101 and 102. Typically, the two halves of the casing will be moulded from plastics material or similar water-impervious material. The upper surface 103 of the casing (as seen in Figure 1) incorporates an aperture or window 104 through which the interior of the casing can be viewed. Projecting from the left hand end 105 of the casing is a wick 106. The wick comprises an upper layer 107 of non-woven fabric material, bonded to a supporting layer 108 of plastics material such as polyester sheet.
Referring to Figure 2 which shows an exploded view of the device, the contents of the casing comprise an assay strip 200, a sink 201 and the non-exposed portion 202 of wick 106.
The assay strip 200 comprises a narrow rectangular strip 203 of porous material, such as nitrocellulose sheet, bonded to a supporting strip 204 of identical rectangular dimensions. Supporting strip 204 can be of plastics material or similar moisture-impervious material which will not affect the flow of moisture along the strip in use.
The supporting strip can be transparent or translucent, so that the assay strip can be viewed through it. The assay strip can be placed against the interior of the casing adjacent aperture 104, the moisture-impervious supporting strip being used to inhibit ingress of moisture via the aperture.
The assay strip includes one or more detection zones within which the assay result is revealed by the formation or WO9G/03516 - 2 1 9 9 8 2 3 PCT~P95/03722 -accumulation of a detectable reagent such as a coloured label which reveals the zone as a line, spot or other symbol. If desired, the assay strip can also include a control zone (generally downstream from the detection zone) to indicate to the user that the test has been performed correctly. These zones are not shown in the drawings, but will be in the region of the strip generally indicated by the letter A in Figure 2, and therefore visible from the exterior of the casing through aperture 104. The assay strip and supporting strip are pierced by a locating hole 205.
Sink 201 can comprise any moisture-absorbent material having sponge-like properties to take up excess fluid that has progressed along the assay strip.
Wick 106 extends for a considerable distance inside the casing, and includes a region 206 towards its right hand end in which a labelled mobile component has been pre-dosed and awaits the presence of sample liquid in the wick which will render the labelled reagent mobile and transfer it elsewhere within the device. The wick is also pierced by a locating hole 207.
Lower half 102 of casing 100 acts as a tray to accomodate the various internal components. The lower half of the casing is provided with two pins or pegs 208 and 209 which extend upwards from the floor 210 of the casing. During manufacture, wick 106 is placed in the lower casing and located in a predetermined place by pin 208 passing through hole 207. The sink 201 is placed at the opposite end of the casing. The assay strip is placed over these components and located in a predetermined place by allowing pin 209 to pass through hole 205.
Referring to Figure 3, which shows a cross-section of the W096/09546 2 1 9 9 8 2 3 PCT~P95/03722 fully assembled device, it can be seen that the assay strip 203 overlaps the right hand end 300 of the wick 107 so that liquid can flow along the length of the wick and then into the left hand end 301 of the assay strip. The right hand end 302 of the assays strip overlaps the sink 201.
Therefore there is a continuous liquid flow-path from the exposed left hand portion 303 of the wick through to the sink. The upper and lower halves of the casing provide a tight seal against the wick so that moisture cannot enter the device other than by flowing through the wick material itself.
It will be appreciated that the device as illustrated in these drawings and as just described, can be modified very considerably without departing from the scope of the invention. Th_ proportions and overall shape of the casing and other comp~nents can be altered and is largely a matter of asthetics. More than one aperture or window can be provided. The sink is an optional feature and can be discarded if the downstream portion of the assay strip has sufficient liquid capacity. It will also be appreciated that the manner in which the components within the casing are held in place is not crit_cal to the invention, and the arrangement as shown in the drawings is provided purely by way of example.
The general construction of a wick in accordance with the invention is illustrated, by way of example, in Figure 4 of the accompanying drawings. This figure shows a layer 400 of non-woven fabric material bonded to a supporting layer 401 of plastics sheet. The non-woven fabric has a fibrous structure 402. The wick is of rectangular form and tne majority of the fibres making up the non-woven material lie substantially parallel to the long axis of the wick.
Ar acent one end of the wick is a broad line 403 of deposited labelled reagent (represented by dots although wo 96,09546 2 1 9 9 8 2 3 PCT~P95/03722 the individual labelled components will not be seperately visible to the human eye). The line runs across the width of the wick. The cut edge 404 of the wick reveals that the labelled component is substantially on the surface of the wick. Deposition of the labelled reagent in this manner can readily be achieved, for example, by glazing the strip material prior to application of the labelled reagent.
li~XAMPT.F~
The following Example demonstrates the improved properties of a wick made in accordance with the invention.
An assay device as generally described above with reference to the accompanying drawings is constructed as follows:
The device is intended to detect the presence of luteinizing hormone (LH) in urine for the purposes of an ovulation detection test. The wick is made from a commercially available non-woven fabric material consisting of a blend of viscose/polyester (30:70) having a weight of 70gsm. The fabric is selected such that its fibrous structure is distinctly directional, with more than two thirds of the fibres running substantially parallel to one dimension. The non-woven material is infused with an aqueous Tris buffer containing by weight about 0.01~ Tween 20 detergent. After drying, the non-woven material is laminated onto a polyester backing sheet of thickness about 175 ~m, using a heat-sensitive adhesive. A reagent comprising anti-LH monoclonal antibodies adsorbed onto latex (polystyrene) spheres of diameter about 0.3 ~m is deposited as a broad line on the non-woven material using an airbrush, as generally described in EP 291194.
Subsequent mobility (under the influence of urine) of the deposited labelled reagent is enhanced by pre-treatment of the non-woven material with sucrose or other sugar to form - W096/09546 2 1 9 9 8 2 3 PCT~P95/03722 a glaze in the region to which the latex-labelled reagent is to be applied. Alternatively, the sucrose or other sugar can be included in the deposition buffer with the labelled reagent. This is also described in greater detail in EP 291194. The line of deposited labelled reagent is orthogonal to the direction in which the fibres in the non-woven material predominantly lie.
After reagent deposition, the laminated wick is cut mechanically into strips 6 mm wide and of length about 55 mm. The long axis of the cut strip is parallel to the direction in which the majority of fibres run. The line of deposited labelled material therefore runs across the strip, and the strip is cut such that the line of deposited labelled material is adjacent one end of the strip.
Polyester-backed nitrocellulose sheet of pore size approximately 8~ is converted into immunochromatographic test strips, as generally described in EP 291194, by the deposition of a line of anti-LH monoclonal antibody by a microsyringe and subsequent blocking of the nitrocellulose using polyvinyl alcohol. The treated nitrocellulose sheet is cut into test strips of width 6 mm and length about 40 mm.
The test strip and the wick are assembled within a two-part polystyrene casing in the manner described above with reference to the drawings. The casing also contains a sink comprising a pad of conventional filter paper. The test line which runs across the test strip is situated beneath the aperture in the casing.
If desired, the test strip can also incorporate a control zone (for example downstream from the detection zone) which may comprise, for example, a deposited line of anti-species antibody (such as an anti-mouse monoclonal antibody if the W096/09546 PCT~P95/03722 labelled reagent comprises a murine monoclonal).
Contact of the exposed portion of the wick with a urine sample (eg. a urine stream) causes immediate saturation of the non-woven material. The labelled reagent (protected within the casing from being washed out of the wick by contact with the external sample) is released into suspension by the absorbed urine, and the urine migrates by capillary action from the wick along the length of the nitrocellulose strip and into the sink. The labelled reagent is carried with the migrating urine. If the urine contains LH, a sandwich reaction occurs and the labelled reagent can become bound in the detection zone to reveal the presence of LH.
In a device constructed as just described, it is found that release of the deposited labelled reagent is rapid and effective and the sensitivity and reliability of the assay result is enhanced.
Claims (15)
1. An assay device having a sample receiving member ("wick") consisting essentially of non-woven fabric material.
2. A device according to claim 1, in which said wick consists essentially of a single layer or sheet of non-woven fabric material.
3. A device according to claim 1, in which said non-woven fabric material is a blend of viscose and polyester.
4. A device according to claim 3, in which said non-woven fabric material consists essentially of about 30% viscose and about 70% polyester.
5. A device according to claim 1, in which said non-woven fabric material has a weight of at least about 50 g/m.
6. A device according to claim 1, in which said non-woven fabric material has a weight of preferably at least about 70 g/m.
7. A device according to claim 1, wherein said non-woven fabric material is bonded to a supporting layer of non-water-absorbent material.
8. A device according to claim 7, wherein said supporting layer is polyester sheet.
9. A device according to claim 1, wherein said non-woven fabric material consists essentially of fibres, and the numerical ratio of flow-parallel fibres to flow-orthogonal fibres is 2:1 or greater, the flow direction being that in which applied liquid sample must flow along said wick into said assay device.
10. A device according to claim 1 in which said wick incorporates a dried labelled reagent which becomes mobile under the influence of sample liquid applied to said wick.
11. A device according to claim 10 wherein said labelled reagent is labelled with a particulate direct label.
12. A device according to claim 11, wherein said label is coloured latex.
13. An assay device having a sample receiving member ("wick") consisting essentially of a single layer or sheet of non-woven fabric material bonded to a supporting layer on non-water-absorbant material, said non-woven fabric being a blend of viscose and polyester, and said non-woven fabric having a weight of at least 50 gm/m, said wick incorporating a dried labelled reagent which becomes mobile under the influence of sample liquid applied to said wick.
14. A device according to claim 13, wherein said non-woven fabric material consists essentially of fibres, and the numerical ratio of flow-parallel fibres to flow-orthogonal fibres is 2:1 or greater, the flow direction being that in which applied liquid sample must flow along said wick into said assay device.
15. A device according to claim 14, wherein said labelled reagent is labelled with a particulate direct label.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9419267A GB9419267D0 (en) | 1994-09-23 | 1994-09-23 | Assay devices |
| GB9419267.1 | 1994-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2199823A1 true CA2199823A1 (en) | 1996-03-28 |
Family
ID=10761833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002199823A Abandoned CA2199823A1 (en) | 1994-09-23 | 1995-09-21 | Assay devices with non-woven sample collection zone |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6399398B1 (en) |
| EP (1) | EP0782707B1 (en) |
| JP (1) | JPH10505909A (en) |
| AT (1) | ATE173828T1 (en) |
| CA (1) | CA2199823A1 (en) |
| DE (1) | DE69506270T2 (en) |
| ES (1) | ES2124021T3 (en) |
| GB (1) | GB9419267D0 (en) |
| WO (1) | WO1996009546A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9046518B2 (en) | 2009-04-09 | 2015-06-02 | Hitachi Chemical Company, Ltd. | Detector and detection method |
Families Citing this family (104)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2322192B (en) * | 1997-02-14 | 2001-01-31 | Unilever Plc | Assay devices |
| GB9720436D0 (en) * | 1997-09-26 | 1997-11-26 | Fibretech Limited | Improvements in or relating to a polyester fibre filling |
| US6837171B1 (en) | 2002-04-29 | 2005-01-04 | Palmer/Snyder Furniture Company | Lightweight table with unitized table top |
| US20030119203A1 (en) | 2001-12-24 | 2003-06-26 | Kimberly-Clark Worldwide, Inc. | Lateral flow assay devices and methods for conducting assays |
| US20050109951A1 (en) * | 2001-12-27 | 2005-05-26 | Falk Fish | Novel device, system and method for fluorescence detection |
| US7285424B2 (en) | 2002-08-27 | 2007-10-23 | Kimberly-Clark Worldwide, Inc. | Membrane-based assay devices |
| US7781172B2 (en) | 2003-11-21 | 2010-08-24 | Kimberly-Clark Worldwide, Inc. | Method for extending the dynamic detection range of assay devices |
| GB0300820D0 (en) * | 2003-01-14 | 2003-02-12 | Diagnoswiss Sa | Membrane-microchannel strip |
| US20040181172A1 (en) | 2003-03-12 | 2004-09-16 | Carney Fiona Patricia | Devices for collecting analytes of interest in tears |
| US20040181167A1 (en) | 2003-03-13 | 2004-09-16 | Carney Fiona Patricia | Method and kits for monitoring women's health |
| CA2468014C (en) * | 2003-06-04 | 2016-03-22 | Inverness Medical Switzerland Gmbh | Flow sensing for determination of assay results |
| US7315378B2 (en) | 2003-06-04 | 2008-01-01 | Inverness Medical Switzerland Gmbh | Optical arrangement for assay reading device |
| US7239394B2 (en) | 2003-06-04 | 2007-07-03 | Inverness Medical Switzerland Gmbh | Early determination of assay results |
| US7317532B2 (en) * | 2003-06-04 | 2008-01-08 | Inverness Medical Switzerland Gmbh | Flow sensing for determination of assay results |
| DK1484601T3 (en) * | 2003-06-04 | 2009-06-08 | Inverness Medical Switzerland | Optical device for an assay reading device |
| US6991898B2 (en) * | 2003-10-20 | 2006-01-31 | Kimberly-Clark Worldwide, Inc. | Diagnostic test device and method of using same |
| US7713748B2 (en) | 2003-11-21 | 2010-05-11 | Kimberly-Clark Worldwide, Inc. | Method of reducing the sensitivity of assay devices |
| US7943395B2 (en) | 2003-11-21 | 2011-05-17 | Kimberly-Clark Worldwide, Inc. | Extension of the dynamic detection range of assay devices |
| AU2004305066B2 (en) | 2003-12-18 | 2010-04-01 | Abbott Rapid Diagnostics International Unlimited Company | Monitoring method and apparatus |
| GB0329288D0 (en) | 2003-12-18 | 2004-01-21 | Inverness Medical Switzerland | Monitoring method and apparatus |
| US20050191704A1 (en) * | 2004-03-01 | 2005-09-01 | Kimberly-Clark Worldwide, Inc. | Assay devices utilizing chemichromic dyes |
| WO2005095967A1 (en) * | 2004-03-23 | 2005-10-13 | Quidel Corporation | Hybrid phase lateral flow assay |
| CN100357738C (en) * | 2004-03-26 | 2007-12-26 | 博奥生物有限公司 | Method of detecting small molecule compound and its special biochip |
| US20060019265A1 (en) * | 2004-04-30 | 2006-01-26 | Kimberly-Clark Worldwide, Inc. | Transmission-based luminescent detection systems |
| US7796266B2 (en) * | 2004-04-30 | 2010-09-14 | Kimberly-Clark Worldwide, Inc. | Optical detection system using electromagnetic radiation to detect presence or quantity of analyte |
| US20050244953A1 (en) * | 2004-04-30 | 2005-11-03 | Kimberly-Clark Worldwide, Inc. | Techniques for controlling the optical properties of assay devices |
| US7815854B2 (en) * | 2004-04-30 | 2010-10-19 | Kimberly-Clark Worldwide, Inc. | Electroluminescent illumination source for optical detection systems |
| JP2008513787A (en) * | 2004-09-20 | 2008-05-01 | バイエル・ヘルスケア・エルエルシー | Biological test strip |
| US7659091B2 (en) * | 2004-09-21 | 2010-02-09 | Nourheart, Inc. | Diagnostic marker |
| US20060063199A1 (en) * | 2004-09-21 | 2006-03-23 | Elgebaly Salwa A | Diagnostic marker |
| US20070121113A1 (en) * | 2004-12-22 | 2007-05-31 | Cohen David S | Transmission-based optical detection systems |
| US7682817B2 (en) * | 2004-12-23 | 2010-03-23 | Kimberly-Clark Worldwide, Inc. | Microfluidic assay devices |
| US7189522B2 (en) | 2005-03-11 | 2007-03-13 | Chembio Diagnostic Systems, Inc. | Dual path immunoassay device |
| WO2006098804A2 (en) | 2005-03-11 | 2006-09-21 | Chembio Diagnostic Systems, Inc. | Dual path immunoassay device |
| US7939342B2 (en) | 2005-03-30 | 2011-05-10 | Kimberly-Clark Worldwide, Inc. | Diagnostic test kits employing an internal calibration system |
| US7439079B2 (en) | 2005-04-29 | 2008-10-21 | Kimberly-Clark Worldwide, Inc. | Assay devices having detection capabilities within the hook effect region |
| US7858384B2 (en) * | 2005-04-29 | 2010-12-28 | Kimberly-Clark Worldwide, Inc. | Flow control technique for assay devices |
| US7803319B2 (en) * | 2005-04-29 | 2010-09-28 | Kimberly-Clark Worldwide, Inc. | Metering technique for lateral flow assay devices |
| US20070042427A1 (en) * | 2005-05-03 | 2007-02-22 | Micronics, Inc. | Microfluidic laminar flow detection strip |
| US7662571B2 (en) * | 2005-07-14 | 2010-02-16 | Nourheart Inc. | Mitochondrial markers of ischemia |
| US7504235B2 (en) * | 2005-08-31 | 2009-03-17 | Kimberly-Clark Worldwide, Inc. | Enzyme detection technique |
| US7829347B2 (en) * | 2005-08-31 | 2010-11-09 | Kimberly-Clark Worldwide, Inc. | Diagnostic test kits with improved detection accuracy |
| US8003399B2 (en) * | 2005-08-31 | 2011-08-23 | Kimberly-Clark Worldwide, Inc. | Nitrite detection technique |
| US7279136B2 (en) | 2005-12-13 | 2007-10-09 | Takeuchi James M | Metering technique for lateral flow assay devices |
| US7618810B2 (en) * | 2005-12-14 | 2009-11-17 | Kimberly-Clark Worldwide, Inc. | Metering strip and method for lateral flow assay devices |
| US7871568B2 (en) * | 2006-01-23 | 2011-01-18 | Quidel Corporation | Rapid test apparatus |
| US7794656B2 (en) * | 2006-01-23 | 2010-09-14 | Quidel Corporation | Device for handling and analysis of a biological sample |
| WO2007106579A2 (en) * | 2006-03-15 | 2007-09-20 | Micronics, Inc. | Integrated nucleic acid assays |
| US20080008694A1 (en) * | 2006-07-05 | 2008-01-10 | Elgebaly Salwa A | Methods to prevent and treat diseases |
| US20080057528A1 (en) * | 2006-08-30 | 2008-03-06 | Kimberly-Clark Worldwide, Inc. | Detection of hydrogen peroxide released by enzyme-catalyzed oxidation of an analyte |
| ES2655564T3 (en) | 2006-09-07 | 2018-02-20 | Otago Innovation Limited | Biomarker for the early detection of acute heart disorders |
| US8012761B2 (en) * | 2006-12-14 | 2011-09-06 | Kimberly-Clark Worldwide, Inc. | Detection of formaldehyde in urine samples |
| US7846383B2 (en) * | 2006-12-15 | 2010-12-07 | Kimberly-Clark Worldwide, Inc. | Lateral flow assay device and absorbent article containing same |
| US7935538B2 (en) * | 2006-12-15 | 2011-05-03 | Kimberly-Clark Worldwide, Inc. | Indicator immobilization on assay devices |
| US8377379B2 (en) * | 2006-12-15 | 2013-02-19 | Kimberly-Clark Worldwide, Inc. | Lateral flow assay device |
| GB2450351B (en) | 2007-06-20 | 2012-01-18 | Cozart Bioscience Ltd | Monitoring an Immunoassay |
| JP5249534B2 (en) * | 2007-07-09 | 2013-07-31 | 大塚製薬株式会社 | Test paper measuring container |
| EP2200744B1 (en) * | 2007-09-14 | 2020-05-27 | Biosensia Patents Limited | An analysis system |
| JP5135975B2 (en) * | 2007-10-01 | 2013-02-06 | 日立化成工業株式会社 | Detection apparatus and detection method |
| AU2009224114B2 (en) | 2008-03-12 | 2013-02-21 | Otago Innovation Limited | Biomarkers |
| CA2715914C (en) | 2008-03-12 | 2019-01-22 | Otago Innovation Limited | Insulin signal peptide fragment biomarkers |
| KR101510785B1 (en) * | 2008-03-27 | 2015-04-10 | 프레지던트 앤드 펠로우즈 오브 하바드 칼리지 | Cotton thread as a low-cost multi-assay diagnostic platform |
| US20100022916A1 (en) | 2008-07-24 | 2010-01-28 | Javanbakhsh Esfandiari | Method and Apparatus for Collecting and Preparing Biological Samples for Testing |
| GB0820999D0 (en) | 2008-11-17 | 2008-12-24 | Menon Johansson Anatole S | Pregnancy testing |
| DE102009010563A1 (en) | 2009-02-16 | 2010-08-26 | Matthias W. Engel | Device for the detection of analytes in body fluids |
| CN102388310B (en) | 2009-04-09 | 2014-07-16 | 爱科来株式会社 | Sample analyzing tool, method of manufacturing sample analyzing tool, and method of minimizing drop in solution permeability of deployment member |
| JP5532660B2 (en) * | 2009-04-09 | 2014-06-25 | 日立化成株式会社 | Detection apparatus and detection method |
| TWI497074B (en) * | 2009-04-13 | 2015-08-21 | Hitachi Chemical Co Ltd | Detecting device and detecting method thereof |
| EP2249144A3 (en) * | 2009-05-06 | 2011-01-26 | F. Hoffmann-La Roche AG | System and method for the automated analysis of samples |
| US20100290948A1 (en) * | 2009-05-15 | 2010-11-18 | Xuedong Song | Absorbent articles capable of indicating the presence of urinary tract infections |
| KR101851117B1 (en) | 2010-01-29 | 2018-04-23 | 마이크로닉스 인코포레이티드. | Sample-to-answer microfluidic cartridge |
| AU2011236503B2 (en) | 2010-04-07 | 2014-10-30 | Biosensia Patents Limited | Flow control device for assays |
| BR112012026219B1 (en) * | 2010-04-13 | 2019-12-10 | M Lab Ag | method for diagnosing glaucoma, antigen carrier elements and kit |
| EP3246335A3 (en) | 2010-07-19 | 2017-12-27 | Otago Innovation Limited | Signal biomarkers |
| KR101888213B1 (en) * | 2010-10-01 | 2018-08-13 | 홀로직, 인크. | Immunoassay test strip for use in a diagnostic system |
| US8486717B2 (en) | 2011-01-18 | 2013-07-16 | Symbolics, Llc | Lateral flow assays using two dimensional features |
| US8603835B2 (en) | 2011-02-10 | 2013-12-10 | Chembio Diagnostic Systems, Inc. | Reduced step dual path immunoassay device and method |
| JP6373191B2 (en) | 2012-01-10 | 2018-08-15 | アイデックス ラボラトリーズ インコーポレイテッドＩＤＥＸＸ Ｌａｂｏｒａｔｏｒｉｅｓ， Ｉｎｃ． | Immunoassay test slides |
| DK2828282T3 (en) | 2012-03-20 | 2018-03-05 | Otago Innovation Ltd | Biomarkers |
| US11360076B2 (en) | 2012-03-30 | 2022-06-14 | Weavr Health Corp. | Methods and systems to collect a biological sample |
| US9651549B2 (en) | 2012-07-13 | 2017-05-16 | Genisphere, Llc | Lateral flow assays using DNA dendrimers |
| US9874556B2 (en) | 2012-07-18 | 2018-01-23 | Symbolics, Llc | Lateral flow assays using two dimensional features |
| WO2014100743A2 (en) | 2012-12-21 | 2014-06-26 | Micronics, Inc. | Low elasticity films for microfluidic use |
| WO2014100725A1 (en) | 2012-12-21 | 2014-06-26 | Micronics, Inc. | Portable fluorescence detection system and microassay cartridge |
| EP2935908B1 (en) | 2012-12-21 | 2019-08-14 | PerkinElmer Health Sciences, Inc. | Fluidic circuits and related manufacturing methods |
| US9599615B2 (en) | 2013-03-13 | 2017-03-21 | Symbolics, Llc | Lateral flow assays using two dimensional test and control signal readout patterns |
| WO2014182847A1 (en) | 2013-05-07 | 2014-11-13 | Micronics, Inc. | Device for preparation and analysis of nucleic acids |
| WO2014182844A1 (en) | 2013-05-07 | 2014-11-13 | Micronics, Inc. | Microfluidic devices and methods for performing serum separation and blood cross-matching |
| CA2911303C (en) | 2013-05-07 | 2021-02-16 | Micronics, Inc. | Methods for preparation of nucleic acid-containing samples using clay minerals and alkaline solutions |
| US11358138B2 (en) | 2013-07-19 | 2022-06-14 | Boston Microfluidics Inc. | Fluid sample collection device |
| MX2016012881A (en) | 2014-04-02 | 2017-05-10 | Chembio Diagnostic Systems Inc | Immunoassay utilizing trapping conjugate. |
| US20160116466A1 (en) | 2014-10-27 | 2016-04-28 | Chembio Diagnostic Systems, Inc. | Rapid Screening Assay for Qualitative Detection of Multiple Febrile Illnesses |
| SG11202003744PA (en) | 2017-10-27 | 2020-05-28 | Boston Microfluidics Inc | Fluid sample collection device |
| US11484877B2 (en) | 2018-05-29 | 2022-11-01 | Weavr Health Corp. | Blood metering device with desiccant and support for storage media and inlay with flange |
| USD900336S1 (en) | 2018-10-19 | 2020-10-27 | Boston Microfluidics, Inc. | Window for blood storage device |
| USD921219S1 (en) | 2018-10-19 | 2021-06-01 | Weave Health Corp. | Blood storage device |
| USD894422S1 (en) | 2018-10-19 | 2020-08-25 | Boston Microfluidics, Inc. | Blood collection device |
| USD899624S1 (en) * | 2018-10-19 | 2020-10-20 | Boston Microfluidics, Inc. | Blood storage device with two access openings |
| US11772097B2 (en) | 2018-10-19 | 2023-10-03 | Renegadexbio, Pbc | Simultaneous spot test and storage of blood samples |
| USD890949S1 (en) | 2018-10-19 | 2020-07-21 | Boston Microfluidies, Inc. | Sample port for blood collection device |
| WO2020086397A1 (en) | 2018-10-23 | 2020-04-30 | Boston Microfluidics, Inc. | Funnel with extension tube to augment blood collection device |
| JP7207719B2 (en) * | 2019-03-26 | 2023-01-18 | 国立大学法人愛媛大学 | CHROMATOGRAPH MEDIUM AND MANUFACTURING METHOD THEREOF |
| JP2022076838A (en) * | 2020-11-10 | 2022-05-20 | プリマハム株式会社 | Allergen detection kit |
| USD1001309S1 (en) * | 2021-05-26 | 2023-10-10 | Knonap Llc | Testing device |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5767860A (en) | 1980-10-15 | 1982-04-24 | Fuji Photo Film Co Ltd | Material for multilayer analysis |
| JPS59170768A (en) | 1983-03-17 | 1984-09-27 | Fuji Photo Film Co Ltd | Multilayered analyzing element for non-isotope assay and assay method using said element |
| JPS61278761A (en) | 1985-06-04 | 1986-12-09 | Fuji Photo Film Co Ltd | Integral type multi-layered analyzing element for analyzing ammonia forming substrate |
| DE3687928T2 (en) | 1985-06-20 | 1993-07-08 | Fuji Photo Film Co Ltd | REAGENT SHEET AND INTEGRATING MULTILAYER ANALYTICAL ELEMENT FOR MEASURING THE EFFECTIVENESS OF GAMMA-GLUTAMYL TRANSFERASE. |
| US4752448A (en) | 1985-12-18 | 1988-06-21 | Keystone Diagnostics, Inc. | Drug abuse test paper |
| EP0244825B1 (en) | 1986-05-09 | 1992-10-07 | Fuji Photo Film Co., Ltd. | Dry-type analytical element for cholesterol |
| DE3856421T2 (en) * | 1987-04-27 | 2000-12-14 | Unilever Nv | Specific binding test procedures |
| US5122452A (en) * | 1987-05-20 | 1992-06-16 | Carleton University | Enzyme immunoassay with a macroporous hydrophobic synthetic polymer cloth containing an immobilized antibody or antigen |
| US5169757A (en) * | 1987-05-20 | 1992-12-08 | Carleton University | Antibodies or antigens bound to a macroporous hydrophobic synthetic polymer cloth for immunological techniques |
| DE3887491T2 (en) | 1987-12-21 | 1994-07-07 | Abbott Lab | Chromatographic binding assay devices and methods. |
| US5304467A (en) | 1988-11-30 | 1994-04-19 | Kyoto Daiichi Kagaku Co., Ltd. | Device for assay of liquid sample |
| JPH04270965A (en) * | 1990-05-18 | 1992-09-28 | Burton W Blais | Preparing method for oligopeptide adsorbing carrier and method for assay and removal for lipopolysaccharide using this method |
-
1994
- 1994-09-23 GB GB9419267A patent/GB9419267D0/en active Pending
-
1995
- 1995-09-21 AT AT95934087T patent/ATE173828T1/en not_active IP Right Cessation
- 1995-09-21 CA CA002199823A patent/CA2199823A1/en not_active Abandoned
- 1995-09-21 EP EP95934087A patent/EP0782707B1/en not_active Revoked
- 1995-09-21 ES ES95934087T patent/ES2124021T3/en not_active Expired - Lifetime
- 1995-09-21 WO PCT/EP1995/003722 patent/WO1996009546A1/en not_active Application Discontinuation
- 1995-09-21 JP JP8510601A patent/JPH10505909A/en not_active Ceased
- 1995-09-21 DE DE69506270T patent/DE69506270T2/en not_active Revoked
- 1995-09-22 US US08/533,075 patent/US6399398B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9046518B2 (en) | 2009-04-09 | 2015-06-02 | Hitachi Chemical Company, Ltd. | Detector and detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10505909A (en) | 1998-06-09 |
| EP0782707A1 (en) | 1997-07-09 |
| ES2124021T3 (en) | 1999-01-16 |
| WO1996009546A1 (en) | 1996-03-28 |
| EP0782707B1 (en) | 1998-11-25 |
| DE69506270T2 (en) | 1999-04-22 |
| ATE173828T1 (en) | 1998-12-15 |
| US6399398B1 (en) | 2002-06-04 |
| GB9419267D0 (en) | 1994-11-09 |
| DE69506270D1 (en) | 1999-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0782707B1 (en) | Assay devices with non-woven sample collection zone | |
| CA2229331C (en) | Assay devices | |
| EP0560411B1 (en) | Specific binding assays | |
| US20030143755A1 (en) | Assays | |
| US6046057A (en) | Analyte assaying device | |
| KR100735080B1 (en) | Immunochromatographic strip for use in immunoassay and kit comprising the same | |
| US6036659A (en) | Collection device for biological samples and methods of use | |
| US20100055717A1 (en) | Sampling and assay device together with methods for use thereof | |
| AU601790B2 (en) | Test carrier for the analytical determination of components of body fluids | |
| EP1086372B1 (en) | Collection device for single step assay of oral fluids | |
| JPH1090267A (en) | Analysis testing device and method | |
| US7312027B2 (en) | Binding assay device with non-absorbent carrier material | |
| CA2291914A1 (en) | Improved immunochromatographic assay | |
| CZ302350B6 (en) | Analytical test element for investigating liquid sample | |
| AU756931B2 (en) | Assay devices with non-woven sample collection zone | |
| AU3651395A (en) | Assay devices with non-woven sample collection zone | |
| WO2001084151A1 (en) | Chromatography measuring instrument | |
| JPH0714892Y2 (en) | Liquid sample inspection tool | |
| JP2002014097A (en) | Chromatographic measuring apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |