WO1999030155A1 - Support for diagnostic tests - Google Patents
Support for diagnostic tests Download PDFInfo
- Publication number
- WO1999030155A1 WO1999030155A1 PCT/GB1998/003642 GB9803642W WO9930155A1 WO 1999030155 A1 WO1999030155 A1 WO 1999030155A1 GB 9803642 W GB9803642 W GB 9803642W WO 9930155 A1 WO9930155 A1 WO 9930155A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- diagnostic test
- mesh
- carrier material
- carrier
- support
- Prior art date
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
-
- 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
-
- 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
- G01N33/525—Multi-layer analytical elements
-
- 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
- G01N33/5302—Apparatus specially adapted for immunological test procedures
- G01N33/5304—Reaction vessels, e.g. agglutination plates
Definitions
- This invention relates to a support for diagnostic tests, to a diagnostic test device incorporating the support and to a method of manufacturing the support-
- Diagnostic test devices are well known for detecting an analyte in fluids, particularly body fluids.
- EP-A-0 207 360 describes such a diagnostic test device in which a bibulous (absorbent) material is impregnated with at least one ingredient capable of producing a detectable response upon contact with the fluid.
- the bibulous material may form a substrate for the test device or it may be in the form of pads mounted on a rigid matrix or substrate.
- a selectively permeable silicone film is bonded over the bibulous material and to the substrate.
- EP-A-0 280 560 describes a membrane structure for use in diagnostic tests in which a microporous membrane formed from a biologically inert material, such as a polyamide, is provided with a coating which does not substantially diminish the porosity of the membrane.
- a diagnostic test support comprising a mesh for supporting a diagnostic test reagent and means for holding the mesh.
- the mesh may comprise a polymeric film or fibre material such as polyester, nylon or cellulose, or a paper material.
- the material of the mesh may be inherently porous or may have pores formed therein.
- the material of the mesh may be transparent or coloured, for example white.
- the mesh may incorporate pores having dimensions in the range from about 10 microns to about 500 microns, preferably from about 10 microns to about 120 microns.
- a layer of carrier for the diagnostic test reagent may be applied to at least one side of the mesh and optionally to both sides thereof.
- the thickness of the at least one layer of carrier may be in the range from about 10 microns to about 60 microns or more.
- the carrier material may comprise a gelatinous material or a polymeric material, such as a resin.
- a coating may be applied to the surface of at least one layer of carrier material.
- the coating may comprise a filter.
- the coating may comprise a light reflective material.
- the carrier may be provided with a permeable protective layer, such as a mesh.
- the protective layer may be impregnated with a permeable material .
- a diagnostic test device incorporating a diagnostic test support as defined hereinabove and a diagnostic test reagent.
- the diagnostic test reagent may be incorporated into the carrier material or may be applied to a surface thereof. Alternatively, the diagnostic reagent may be applied directly to the mesh.
- a support for a diagnostic test device comprising the steps of:
- the sheet of non-adherent material may comprise a sheet of siliconised material.
- the liquid carrier material may be applied to the sheet of non-adherent material subsequent to the mesh.
- the liquid carrier material may be applied to the sheet of non-adherent material prior to the mesh.
- a further layer of liquid carrier material may be applied to the mesh.
- the first-mentioned layer of carrier material may be allowed to dry or otherwise solidify prior to application of the mesh.
- the further layer of carrier material may be allowed to dry or otherwise solidify prior to removal of the carrier material with the mesh embedded therein from the sheet of non- adherent material.
- the diagnostic test reagent may be incorporated into the carrier material or may be applied to a surface thereof.
- a permeable protective layer may be applied to the carrier material.
- the permeable protective layer may comprise a mesh.
- the protective layer may be impregnated with a permeable material.
- Figure 1 is a diagrammatic perspective view of one embodiment of a diagnostic test support according to the present invention.
- Figure 2 is a diagrammatic cross-sectional view through a second embodiment of a diagnostic test support according to the present invention.
- Figure 3 is a diagrammatic cross-sectional view through a third embodiment of a diagnostic test support according to the present invention.
- Figure 4 is a diagrammatic cross-sectional view through a fourth embodiment of a diagnostic test support according to the present invention.
- Figure 5 is a diagrammatic illustration of a method for manufacturing the diagnostic test support of the present invention.
- the diagnostic test support shown in Figure 1 comprises a mesh 1 mounted in a holder 3 which is provided with a handle 5 or other means to facilitate handling of the holder.
- the holder 3 may be made of any suitable material, such as a plastics material, the mesh being secured in place by, for example, sandwiching the mesh between upper and lower components of the holder, by ultrasonic welding or by means of a suitable adhesive or the like.
- the mesh 1 is made of a material which is porous per se or which is treated so as to be porous.
- the material of the mesh may be any suitable material including, for example, a polymeric material film or fibre material such as a polyester, nylon, cellulose or paper which is made into a mesh by forming the material into a woven or non-woven fabric, by casting or by forming apertures through a sheet or film material.
- the material and construction of the mesh 1 may be selected to confer particular optical properties where these may be necessary or desirable for the diagnostic test to be carried out.
- the mesh may be transparent or reflective (that is, opaque or white) or may be formed in a specific colour.
- the material of the mesh should ideally be self-supporting over the dimensions thereof (in practice, about 6 mm square) because any substantial bowing of the mesh, and therefore of the support, would increase the likelihood of light scatter influencing the results of the test where a reflectance meter is employed rather than visual comparison with a colour chart.
- the material of the mesh need not be absorbent, but this is not excluded.
- the material of the mesh is generally selected so as to be inert with respect to the diagnostic test to be carried out, although the mesh could be loaded with a substance which activates or enhances the chemical reaction of the test.
- the physical properties of the mesh are selected such that the porosity of the mesh exerts no influence on the test.
- the dimensions of the pores in the mesh may be of the order of from about 10 to about 500 microns, preferably from about 10 to about 120 microns which can be contrasted to a pore size of about 0.5 to 0.6 microns for a microporous support material.
- a polyester mesh is employed having a pore size of substantially 62 microns.
- a diagnostic test reagent for example an enzyme such as glucose oxidase, is applied directly to the material of the mesh 1.
- the diagnostic test support shown in Figure 2 is similar to that of Figure 1 except that a carrier material 7 for the test reagent is applied to one side of the mesh 1.
- the diagnostic test support shown in Figure 3 is similar to that shown in Figure 2 except that the carrier material 7 for the test reagent is applied to both sides of the mesh 1.
- the carrier material 7 is generally absorbent of the fluid containing the analyte to be tested for, but this is not essential, for example where a surface reaction is to be carried out.
- the carrier material may comprise, for example a gelatinous material or a polymeric material, such as a resin.
- the carrier material itself is inert with respect to the diagnostic test to be carried out, but is impregnated with, or otherwise carries, the diagnostic test reagent .
- the carrier material 7 or the mesh 1 may be provided with a surface coating 8.
- the surface coating could include the diagnostic test reagent, but alternatively the surface coating could function as a filter so as to exclude certain components of the fluid containing the analyte to be tested for.
- the coating could include a light reflective material, such as titanium dioxide powder, so as to enhance any colour change in the diagnostic test reagent. In the case of Figure 3, however, a light reflective material, such as titanium dioxide powder, could be incorporated into the lower layer of carrier material.
- the material of the carrier 7 can, under certain circumstances, function as a filter.
- the carrier material can absorb low molecular weight constituents of the fluid containing the analyte, while acting as a barrier to the penetration of, for example, red blood cells.
- the thickness of the carrier material 7 has a number of effects.
- the thickness (and therefore the volume) of the carrier material controls the volume of the sample tested.
- the thickness additionally influences the intensity of any colour change, thus a relatively thick carrier can be used to enhance any colour change when the analyte is particularly dilute.
- the thickness of the carrier material also influences the reaction rate, with slower reaction rates for thicker carriers.
- a surface coating when provided, especially where the surface coating includes a light reflective material such as titanium dioxide powder, is susceptible to damage if the fluid containing the analyte to be tested for is applied in an abrasive manner. Under certain circumstances, therefore, it may be advantageous to provide a permeable protective cover on at least one surface of the carrier material such as that shown in Figure 4.
- a permeable protective layer is applied to one surface of the carrier material 7 and comprises a mesh 9 which is lightly impregnated with a permeable material 11 (that is, a material that is transmissive of the analyte to be tested for) .
- the mesh 9 may be the same as or different to the mesh 1. That is, the mesh 9 is made of a material which is porous per se or which is treated so as to be porous.
- the material of the mesh 9 may be any suitable material including, for example, a polymeric material film or fibre material such as a polyester, nylon, cellulose or paper which is made into a mesh by forming the material into a woven or non-woven fabric, by casting or by forming apertures through a sheet or film material.
- the impregnating material 11 may comprise, for example, a gelatinous material, such as substantially pure gelatin, or a polymeric material, such as a resin. It has been found that, while the impregnating material is not essential in all cases, it can aid transmission of the fluid containing the analyte through the mesh 9.
- diagnostic test support shown in Figure 3 may be made as illustrated diagrammatically in
- the carrier material such as a sheet of siliconised material
- the carrier material may be gelatin and may be applied in a layer having a thickness of about 60 microns when wet.
- the layer of carrier material is then allow to dry or otherwise solidify, during which process the carrier material may acquire, for example, a degree of porosity.
- a 60 micron layer of gelatin will dry to a thickness of about 10 microns.
- the diagnostic test reagent can either be incorporated into the carrier material or applied subsequently to the surface of the carrier material.
- the mesh 1 is then applied to the surface of the carrier material 7 and a second layer of liquid carrier material 7 is applied to the mesh.
- the second layer of carrier material penetrates the mesh so as to secure the mesh to the first layer of carrier material.
- the second layer of carrier material may have a similar thickness to the first layer and, once applied, is allowed to dry.
- a layer 8 of coloured or reflective material may be applied to the second layer 7 of carrier material.
- coloured or reflective material could be incorporated into the second layer of carrier material.
- the combination of layers can be removed from the non-adherent sheet material 13, cut to size, and mounted in the holder 3 as shown in Figure 1.
- the diagnostic test support shown in Figure 2 is made in a similar way to that of Figure 3, but either the first layer or the second layer of carrier material is omitted and the mesh, if applied to the first layer, may need to be applied before the material of the first layer has fully dried.
- the diagnostic test support shown in Figure 4 is also made in a similar way to that of Figure 3, but with an additional step of applying an impregnated mesh to the second layer of carrier material or to the layer 8 applied thereto.
- the diagnostic test support shown in Figure 1 is made by applying the diagnostic test reagent to the mesh, cutting the mesh to size, and mounting the mesh in the holder 3.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU14425/99A AU1442599A (en) | 1997-12-06 | 1998-12-07 | Support for diagnostic tests |
EP98958354A EP1036326A1 (en) | 1997-12-06 | 1998-12-07 | Support for diagnostic tests |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9725816.4A GB9725816D0 (en) | 1997-12-06 | 1997-12-06 | Support for diagnostic tests |
GB9725816.4 | 1997-12-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999030155A1 true WO1999030155A1 (en) | 1999-06-17 |
Family
ID=10823201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1998/003642 WO1999030155A1 (en) | 1997-12-06 | 1998-12-07 | Support for diagnostic tests |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1036326A1 (en) |
AU (1) | AU1442599A (en) |
GB (1) | GB9725816D0 (en) |
WO (1) | WO1999030155A1 (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3843324A (en) * | 1972-09-13 | 1974-10-22 | Research Corp | Method of cell fractionation and apparatus therefor |
JPH0341359A (en) * | 1989-07-10 | 1991-02-21 | Terumo Corp | Testing appliance |
WO1993019372A1 (en) * | 1992-03-25 | 1993-09-30 | Safefood Micro-System A/S | Method of detecting microorganisms |
US5296192A (en) * | 1992-04-03 | 1994-03-22 | Home Diagnostics, Inc. | Diagnostic test strip |
EP0588564A1 (en) * | 1992-09-18 | 1994-03-23 | AMERSHAM INTERNATIONAL plc | Device and method for affinity separation |
JPH06325716A (en) * | 1993-05-14 | 1994-11-25 | Canon Inc | Mesh |
US5382516A (en) * | 1992-09-15 | 1995-01-17 | Schleicher & Schuell, Inc. | Method and devices for delivery of substrate for the detection of enzyme-linked, membrane-based binding assays |
US5595653A (en) * | 1994-07-15 | 1997-01-21 | Cera, Inc. | Microcolumn for extraction of analytes from liquids |
-
1997
- 1997-12-06 GB GBGB9725816.4A patent/GB9725816D0/en not_active Ceased
-
1998
- 1998-12-07 AU AU14425/99A patent/AU1442599A/en not_active Abandoned
- 1998-12-07 WO PCT/GB1998/003642 patent/WO1999030155A1/en not_active Application Discontinuation
- 1998-12-07 EP EP98958354A patent/EP1036326A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3843324A (en) * | 1972-09-13 | 1974-10-22 | Research Corp | Method of cell fractionation and apparatus therefor |
JPH0341359A (en) * | 1989-07-10 | 1991-02-21 | Terumo Corp | Testing appliance |
WO1993019372A1 (en) * | 1992-03-25 | 1993-09-30 | Safefood Micro-System A/S | Method of detecting microorganisms |
US5296192A (en) * | 1992-04-03 | 1994-03-22 | Home Diagnostics, Inc. | Diagnostic test strip |
US5382516A (en) * | 1992-09-15 | 1995-01-17 | Schleicher & Schuell, Inc. | Method and devices for delivery of substrate for the detection of enzyme-linked, membrane-based binding assays |
EP0588564A1 (en) * | 1992-09-18 | 1994-03-23 | AMERSHAM INTERNATIONAL plc | Device and method for affinity separation |
JPH06325716A (en) * | 1993-05-14 | 1994-11-25 | Canon Inc | Mesh |
US5595653A (en) * | 1994-07-15 | 1997-01-21 | Cera, Inc. | Microcolumn for extraction of analytes from liquids |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 015, no. 184 (P - 1200) 13 May 1991 (1991-05-13) * |
PATENT ABSTRACTS OF JAPAN vol. 095, no. 002 31 March 1995 (1995-03-31) * |
Also Published As
Publication number | Publication date |
---|---|
EP1036326A1 (en) | 2000-09-20 |
AU1442599A (en) | 1999-06-28 |
GB9725816D0 (en) | 1998-02-04 |
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