KR20110046307A - Test meter for use with a dual chamber, multi-analyte test strip with opposing electrodes - Google Patents

Test meter for use with a dual chamber, multi-analyte test strip with opposing electrodes Download PDF

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Publication number
KR20110046307A
KR20110046307A KR1020100103297A KR20100103297A KR20110046307A KR 20110046307 A KR20110046307 A KR 20110046307A KR 1020100103297 A KR1020100103297 A KR 1020100103297A KR 20100103297 A KR20100103297 A KR 20100103297A KR 20110046307 A KR20110046307 A KR 20110046307A
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South Korea
Prior art keywords
analyte
test strip
dual chamber
counter
contact
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KR1020100103297A
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Korean (ko)
Inventor
가빈 맥피
그레메 웹스터
마르코 에프. 카도시
크리스토퍼 필립 레치
스티븐 세트포드
셀웨이언 세이니
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라이프스캔 스코트랜드 리미티드
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Priority to KR1020100103297A priority Critical patent/KR20110046307A/en
Publication of KR20110046307A publication Critical patent/KR20110046307A/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1468—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using chemical or electrochemical methods, e.g. by polarographic means
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/001—Enzyme electrodes
    • C12Q1/005—Enzyme electrodes involving specific analytes or enzymes
    • C12Q1/006—Enzyme electrodes involving specific analytes or enzymes for glucose
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
    • G01N27/3271—Amperometric enzyme electrodes for analytes in body fluids, e.g. glucose in blood
    • G01N27/3272—Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
    • G01N27/3271—Amperometric enzyme electrodes for analytes in body fluids, e.g. glucose in blood
    • G01N27/3274—Corrective measures, e.g. error detection, compensation for temperature or hematocrit, calibration
    • 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
    • G01N33/483—Physical analysis of biological material
    • G01N33/487—Physical analysis of biological material of liquid biological material
    • G01N33/4875—Details of handling test elements, e.g. dispensing or storage, not specific to a particular test method

Abstract

PURPOSE: A test meter used with a dual chamber, multi-analyte test strip having opposing electrodes is provided to facilitate electrochemical reaction with a single interesting analyte and measure the concentration of the single analyte by using counter/reference electrodes and enzyme reagent together with a working electrode. CONSTITUTION: A test meter comprises a test strip receiving module and a signal processing module. The test strip receiving module includes a first electric connector being in contact with a first analyte contact pad of a first working electrode of a dual chamber, multi-analyte test strip(100), a second electric connector being in contact with a second analyte of a second working electrode of the dual chamber, multi-analyte test strip, a third electric connector being in contact with a first counter/reference contact pad of a first counter/reference electrode layer of the dual chamber, multi-analyte test strip, and a fourth connector being in contact with a second counter/reference contact pad of a second counter/reference electrode layer of the dual chamber, multi-analyte test strip. The signal processing module receives a first signal through the first and third electric connectors and a second signal through the second and fourth electric connectors and uses the first and second signal for respectively measuring first and second analytes in a sample applied to the dual chamber, multi-analyte test strip.

Description

TEST METER FOR USE WITH A DUAL CHAMBER, MULTI-ANALYTE TEST STRIP WITH OPPOSING ELECTRODES}

The present invention generally relates to medical devices, in particular analyte test strips, test meters and related methods.

Measurement of analytes (eg, detection and / or concentration measurements) in fluid samples is of particular interest in the medical arts. For example, it may be desirable to measure glucose, ketone, cholesterol, acetaminophen and / or HbA1c concentrations in samples of body fluids such as urine, blood or interstitial fluid. Such measurements can be achieved using analyte test strips, for example based on relevant test meters in combination with photometric or electrochemical techniques.

Typical electrochemical-based analyte test strips facilitate the electrochemical reaction with a single analyte of interest using the relevant counter / reference electrode and enzyme reagents along with the working electrode, thereby measuring the concentration of that single analyte. For example, electrochemical-based analyte test strips for the determination of glucose concentration in blood samples may use enzyme reagents including enzyme glucose oxidase and mediator ferricyanide. Such conventional analyte test strips are described, for example, in US Pat. No. 5,708,247; 5,951,836; 5,951,836; No. 6,241,862; And 6,284,125; Each of which is incorporated herein by reference in its entirety.

New features of the invention are particularly described in the appended claims. A more clear understanding of the features and advantages of the present invention will be obtained by reference to the following detailed description describing exemplary embodiments in which the principles of the invention have been utilized, and to the accompanying drawings in which like reference numerals designate like elements.
<Figure 1>
1 is a simplified exploded perspective view of a dual chamber multi-analyte test strip according to one embodiment of the invention.
2a to 2k
2A-2K illustrate the first insulating layer, the first electrically conductive layer, the first analyte reagent layer, the first patterned spacer layer, the first relative / reference of the dual chamber multi-analyte test strip of FIG. 1, respectively. Simplified plan view of the electrode layer, counter / reference insulating layer, second counter / reference electrode layer, second patterned spacer layer, second analyte reagent layer, second electrically conductive layer, and second insulating layer.
3,
3 is a simplified plan view of the dual chamber multi-analyte test strip of FIG.
Figure 4a
4A is a simplified diagram of the dual chamber multi-analyte test strip of FIGS. 1-3 in use with a test meter in accordance with one embodiment of the present invention.
Figure 4b
4B is a simplified end view of the dual chamber multi-analyte test strip and test meter electrical connector of FIG. 4A.
<Figure 5>
5 is a graph of current (unit: amps) versus time (unit: seconds) obtained during testing of a dual-chamber multi-analyte test strip according to one embodiment of the present invention.
6,
6 is a flow diagram illustrating the steps of a method for measuring multiple analytes in a single bodily fluid sample applied to a dual-chamber multi-analyte test strip in accordance with one embodiment of the present invention.

The following detailed description should be understood with reference to the drawings, wherein like elements are denoted by like reference numerals in different drawings. The drawings, which are not necessarily drawn to scale, illustrate exemplary embodiments for illustrative purposes only and are not intended to limit the scope of the invention. The detailed description describes by way of example, not by way of limitation, the principles of the invention. This description will clearly enable those skilled in the art to make and use the invention, and describes several embodiments, adaptations, variations, alternatives, and uses of the invention, including what is presently considered the best mode of carrying out the invention. .

A dual chamber multi-analyte test strip (also referred to herein simply as a test strip) according to an embodiment of the present invention is disposed on a first insulating layer, a first insulating layer (first working electrode and first analyte contact) A first electrically conductive layer having a pad, and a first patterned spacer layer. The first patterned spacer layer is positioned over the first electrically conductive layer, and a first sample-receiving chamber having a first end opening and a second end opening is formed therein. The first sample-receiving chamber is placed over the first working electrode. The test strip also includes a first counter / reference electrode layer exposed to the first sample receiving chamber and configured in an opposite (ie, co-facial) relationship with the first working electrode. The first counter / reference electrode layer has a first counter / reference contact pad.

The test strip further includes a counter / reference insulating layer disposed over the first counter / reference electrode layer, and a second counter / reference electrode layer (with a second counter / reference contact pad) disposed on the counter / reference insulating layer. . Also included in the test strip is a second patterned spacer layer located over the second counter / reference electrode layer. The second patterned spacer layer is formed therein with a second sample-receiving chamber having a first end opening and a second end opening. The test strip further includes a second electrically conductive layer (having a second working electrode and a second analyte contact pad) disposed over the second patterned spacer layer, a second insulating layer disposed over the second electrically conductive layer, a first A first analyte reagent layer disposed on the first working electrode in the sample-receiving chamber, and a second analyte reagent layer disposed on the second working electrode in the second sample-receiving chamber. The second counter / reference electrode layer is exposed to the second sample receiving chamber and is in an opposite (face-to-face) relationship with the second working electrode.

In a dual chamber multi-analyte test strip according to an embodiment of the present invention, for example, a plurality of non-identical analytes (eg, analyte glucose and ketone analyte 3-hydroxybutyrate) are applied to the test strip. It is advantageous in that it can be measured in a bodily fluid sample (eg, a single whole blood sample). In addition, since the dual chamber multi-analyte test strip has two separate sample-receiving chambers, harmful cross-contamination between analyte reagents, cross-contamination of reaction products and / or by-products, and / Or the possibility for cross-electrical interference during the measurement of two analytes is eliminated. Moreover, since the first counter / reference electrode is in opposing (ie, facing) relationship with the first working electrode, and the second counter / reference electrode layer is in opposing (ie, facing) relationship with the second working electrode, the double chamber multiple Analyte test strips are advantageously of small overall size and have a small sample-receiving chamber. Moreover, dual chamber multi-analyte test strips in accordance with embodiments of the present invention can be prepared using conventional simple and relatively inexpensive web-based techniques.

1 is a simplified exploded perspective view of a dual chamber multi-analyte test strip 100 according to one embodiment of the invention. 2A-2K illustrate a first insulating layer 102, a first electrically conductive layer 104, a first analyte reagent layer 106, a first patterned layer of a dual chamber multi-analyte test strip 100. The spacer layer 108, the first counter / reference electrode layer 110, the counter / reference insulating layer 112, and the second counter / reference electrode layer 114 (layers 110, 112, 114 are shown in FIG. 1 for brevity). Shown as a single layer, more precisely as a separate layer in FIGS. 2E-2G), a second patterned spacer layer 116, a second analyte reagent layer 118, A simplified plan view of the second electrically conductive layer 120, and the second insulating layer 122. 3 is a simplified plan view of a dual chamber multi-analyte test strip 100.

1, 2A-2K and 3, dual chamber multi-analyte test strip 100 is tested (eg, further described herein with respect to the embodiments of FIGS. 4A and 4B). It is configured for use with the meter and has a longitudinal axis 124 (shown in broken lines in FIG. 3), a left edge 126 and a right edge 128.

The dual chamber multi-analyte test strip 100 includes a first insulating layer 102 with a first electrically conductive layer 104 disposed thereon. The first electrically conductive layer 104 includes a first working electrode 130 with a first analyte contact pad 132 (see especially FIG. 2B). The first patterned spacer layer 108 of the dual chamber multi-analyte test strip 100 is disposed over the first electrically conductive layer 104 (see in particular FIG. 1), which patterned spacer layer is therein. A first sample-receiving chamber 134 is formed which overlies the first working electrode 130. Additionally, the first sample-receiving chamber 134 has a first end opening 134a and a second end opening 134b.

The first counter / reference electrode layer 110 of the dual chamber multi-analyte test strip 100 overlies and is exposed to the first sample-receiving chamber 134 and faces the first working electrode 130. Relationship (see Figure 1). In addition, the first counter / reference electrode layer 110 has a counter / reference electrode contact pad 136 (see especially FIG. 2E).

The dual chamber multi-analyte test strip 100 also includes a counter / reference insulating layer 112 disposed over the first counter / reference electrode layer 110. The second counter / reference electrode layer 114 is disposed over the counter / reference insulating layer 112 and has a second counter / reference contact pad 138 (see in particular FIGS. 2G and 3). The counter / reference insulating layer 112 provides electrical insulation between the first counter / reference electrode layer 110 and the second counter / reference electrode layer 114.

The dual chamber multi-analyte test strip 100 further includes a second patterned spacer layer 116, which is located above the second counter / reference electrode layer 114 and the second sample-receiving chamber 140. Is formed in it. The second sample-receiving chamber 140 has a first end opening 140a and a second end opening 140b.

The second electrically conductive layer 120 of the dual chamber multi-analyte test strip 100 is disposed over the second patterned spacer layer 116. The second electrically conductive layer 120 includes a second working electrode 142 with a second analyte contact pad 144 (see FIG. 2J).

The second insulating layer 122 of the dual chamber multi-analyte test strip 100 is disposed over the second electrically conductive layer 120. The dual chamber multi-analyte test strip 100 also includes a first analyte reagent layer 106 (eg, disposed in at least a portion of the first working electrode 130 in the first sample-receiving chamber 134). , A glucose reagent layer) and a second analyte reagent layer 118 (eg, ketone reagent layer) disposed in at least a portion of the second working electrode 142 in the second sample-receiving chamber 140. .

In the dual chamber multi-analyte test strip 100, the second sample-receiving chamber 140 overlies the second working electrode 142, and the second counter / reference electrode layer 114 comprises a second sample receiving chamber ( And exposed in a facing (ie, facing) relationship with the second working electrode 142.

The dual chamber multi-analyte test strip 100 has a first edge opening 134a of the first sample-receiving chamber 134 and a first edge opening 140a of the second sample-receiving chamber 140 at the right edge. Configured to align on 128. In other words, the first end opening 134a is directly below the first end opening 140a and these two openings are only separated by the thicknesses of the first and second counter / reference electrode layers and counter / reference insulating layers. do. This alignment results in a first sample-receiving chamber and a second sample having a second end opening 134b and a second end opening 140b in which a single bodily fluid sample applied on the right edge 128 serves as a vent. Easy entry into the receiving chamber (via capillary action). However, since the second distal opening 134b is aligned with the second distal opening 140b on the left edge 126, a single blood bodily fluid sample may alternatively be applied to the left edge, whereby the second distal opening 134b. ) And through the second end opening 140b into the first sample-receiving chamber and the second sample-receiving chamber (via capillary action), wherein the first end opening 134a and the first end opening 140a Acts as a vent.

1, 2A-2K and 3, the first analyte contact pad 132, the first counterpart / reference contact pad 136, the second analyte contact pad 144, and the second counterpart. The reference contact pad 138 is configured to make an operational electrical contact with the electrical connector of the test meter. Exemplary but non-limiting connections of such pads and electrical connectors are illustrated and described in any position herein with respect to FIGS. 4A and 4B.

The first insulating layer 102, the counter / reference insulating layer 112 and the second insulating layer 122 may be, for example, suitable electrically insulating plastics (eg, PET, PETG, polyimide, polycarbonate, Polystyrene), silicon, ceramic, or glass materials. For example, the first and second insulating layers and the counter / reference insulating layer may be formed of a polyester substrate of 0.178 mm (7 mils).

In the embodiments of FIGS. 1, 2A-2K and 3, the first analyte reagent layer 106 along with the first working electrode 130 and the first counter / reference electrode layer 110 may be any known to those skilled in the art. And configured to electrochemically measure the first analyte concentration in the bodily fluid sample (such as glucose in the whole blood sample) using a suitable electrochemical-based technique. Moreover, the second analyte reagent layer 118, along with the second working electrode 142 and the second counter / reference electrode layer 114, may be further analyzed in the same body fluid sample (such as the concentration of ketone 3-hydroxybutyrate). It is configured to measure the water concentration electrochemically. In such a scenario, the first analyte is measured in a portion of a single bodily fluid sample entering the first sample-receiving chamber and the second analyte is measured in a portion of a single bodily fluid sample entering the second sample-receiving chamber.

First, electrically conductive layer 104 and second electrically conductive layer 120 are, for example, gold, palladium, carbon, silver, platinum, tin oxide, iridium, indium, or a combination thereof (eg, indium doped oxide). Tin), and any suitable conductive material. Moreover, any suitable technique, including, for example, sputtering, evaporation, electroless plating, screen-printing, contact printing or gravure printing, may utilize the first electrically conductive layer 104 and the second electrically conductive layer 120. Can be used to form. For example, the first electrically conductive layer 104 and the second electrically conductive layer 120 may be palladium layers formed by sputtering Pd on the first insulating layer 102 and the second insulating layer 122, respectively. Such Pd layers may, for example, have an electrical sheet resistance in the range of 8-12 ohms / cm 2 and a thickness of about 60 nm.

The first counter / reference electrode layer 110 may be, for example, a gold layer sputter-coated on the bottom surface of the counter / reference insulating layer 112 using conventional techniques known in the art. Similarly, the second counter / reference electrode layer 114 may be, for example, a gold layer sputter coated on the top surface of the counter / reference insulating layer 112 using conventional techniques known in the art. Such gold layers may, for example, have an electrical sheet resistance in the range of 8-12 ohm cm 2 and a thickness of about 30 nm.

The first patterned spacer layer 108 of the dual chamber multi-analyte test strip 100 comprises a first insulating layer 102 (with a first electrically conductive layer 104 thereon) and a first counterpart / The reference electrode layer 110 is configured to bond together the counter / reference insulating layer 112 on its bottom surface and the second counter / reference electrode layer 114 on its top surface. The second patterned spacer layer 116 of the dual chamber multi-analyte test strip 100 includes a second insulating layer 122 and a second relative / reference (with the second electrically conductive layer 120 thereon). It serves to bond the electrode layer 114 together.

The patterned spacer layers 108, 116 can be, for example, a 95 μm thick double sided pressure sensitive adhesive layer, a heat activated adhesive layer, or a thermoset adhesive plastic layer. The patterned spacer layers 108, 116 are for example about 1 micrometer to about 500 micrometers, preferably about 10 micrometers to about 400 micrometers, and more preferably about 40 micrometers to about 200 micrometers. It can have a thickness in the meter range.

The first analyte reagent layer 106 of the dual chamber multi-analyte test strip 100 may be any of the reagents known to those skilled in the art to selectively react with a first analyte, such as glucose, in a bodily fluid sample to form electroactive species. May be a suitable mixture, wherein the species may then be quantitatively measured at the first working electrode of a dual chamber multi-analyte test strip according to an embodiment of the present invention. Thus, the first analyte reagent layer 106 includes at least enzymes and mediators. Examples of suitable mediators include, for example, ferricyanide, ferrocene, ferrocene derivatives, osmium bipyridyl complexes, and quinone derivatives. Examples of suitable enzymes include glucose oxidase, glucose dehydrogenase (GDH) using pyrroloquinoline quinone (PQQ) cofactor, GDH using nicotinamide adenine dinucleotide (NAD) cofactor, and flavin adenine dinucleotide (FAD) Includes GDH using cofactors. The first analyte reagent layer 106 can be applied using any suitable technique.

The second analyte reagent layer 118 of the dual chamber multi-analyte test strip 100 is skilled in the art to selectively react with a second analyte, such as ketone 3-hydroxybutyrate, in a bodily fluid sample to form electroactive species. It may be any suitable mixture of reagents known to the above, and the species may then be measured quantitatively at a second working electrode of a dual chamber multi-analyte test strip according to an embodiment of the invention. Thus, the second analyte reagent layer 118 includes at least enzymes and mediators. The second analyte reagent portion 118 can be applied using any suitable technique. It should be noted that the first analyte and the second analyte are not similar. In other words, the first analyte and the second analyte are not the same species. Thus, two different analytes are measured by the dual chamber multi-analyte test strip according to the present invention.

When the second analyte is ketone 3-hydroxybutyrate, the mediator can be, for example, a mixture of potassium ferricyanide and NAD, and the enzyme can be, for example, a mixture of diaphorase and hydroxybutyrate dehydrogenase.

Once the present invention is known, those of ordinary skill in the art will appreciate that suitable buffers (eg, Tris HCl, citraconate, citrate) may be required if the first analyte reagent layer 106 and the second analyte reagent layer 118 are needed. And phosphate buffers), surfactants (eg, Tritoan X100, Tergitol NP &, Pluronic F68, Betaine and Igepal surfactants), It will be appreciated that thickeners (including, for example, hydroxyethylcellulose, HEC, carboxymethylcellulose, ethylcellulose and alginate thickeners) and other additives known in the art may also be included.

In the embodiment of FIGS. 1-3, it should be noted that the first analyte contact pad 132 and the second analyte contact pad 144 are exposed to opposite sides of the dual chamber multi-analyte test strip 100. . In other words, in the perspective view of FIG. 1, the first analyte contact pad 132 is exposed from the top surface of the dual chamber multi-analyte test strip 100 and the second analyte contact pad 144 is dual chamber multi- The lower surface of the analyte test strip 100 is exposed. Such a configuration facilitates the establishment of a secure and robust electrical connection by the electrical connector of the test meter.

A test meter for use with a dual chamber multi-analyte test strip according to an embodiment of the present invention includes a test strip receiving module and a signal processing module. The test strip receiving module includes a first electrical connector configured to contact a first analyte contact pad of a first working electrode of the test strip; A second electrical connector configured to contact the second analyte contact pad of the second working electrode of the test strip, a third electrical connector configured to contact the first counter / reference contact pad of the first counter / reference electrode layer of the test strip, and And a fourth electrical connector configured to contact the second counterpart / reference contact pad of the second counterpart / reference electrode layer of the test strip.

The signal processing module of the test meter receives the first electrical signal through the first electrical connector and the third electrical connector, such that the first in the bodily fluid sample (eg, whole blood sample) applied to the dual-chamber multi-analyte test strip. And use the first signal for measurement of the analyte (eg glucose). Moreover, the signal processing module also receives a second electrical signal via the second electrical connector and the fourth electrical connector, such that the second analyte (eg, ketone) in the bodily fluid sample applied to the dual-chamber multi-analyte test strip. The second electrical signal for measurement of the analyte). Moreover, the third electrical connector is configured to contact the first mating / reference contact pad in an opposing manner with respect to the contact of the fourth electrical connector and the second mating / reference contact pad.

4A is a simplified diagram of a dual chamber multi-analyte test strip 100 in use with a test meter 200 according to one embodiment of the invention. In FIG. 4A, dashed lines represent certain features that are hidden from the field of view associated with FIG. 4A. 4B is a simplified end view of the dual chamber multi-analyte test strip 100 and test meter electrical connector of the test meter 200. The test meter 200 includes a test strip receiving module 202 and a signal processing module 204 in the case 206.

The test strip receiving module 202 includes a first electrical connector 208 configured to contact a first analyte contact pad of a test strip, a second electrical connector 210 configured to contact a second analyte contact pad of a test strip, A third electrical connector 212 configured to contact the first mating / reference contact pad of the test strip, and a fourth electrical connector 214 configured to contact the second mating / reference contact pad of the test strip.

The signal processing module 204 receives the first signal through the first electrical connector 208 and the third electrical connector 212 to measure the first analyte in the bodily fluid sample applied to the dual-chamber multi-analyte test strip. Configured to use the first signal for this purpose. In addition, the signal processing module 204 also receives a second signal via the second electrical connector 210 and the fourth electrical connector 214, such that the second in the bodily fluid sample applied to the dual-chamber multi-analyte test strip. And use the second signal for measurement of the analyte.

The test meter 200 is configured such that the third electrical connector contacts the first mating / reference contact pad of the test strip in an opposing manner with respect to the contact of the fourth electrical connector with the second mating / reference contact pad. In other words, as shown in FIGS. 4A and 4B, the third electrical contact creates a contact from the bottom of the test strip, and the fourth electrical contact creates a contact from the top of the test strip. Additionally, the first electrical connector is configured to contact the first analyte contact pad of the test strip in an opposite manner with respect to the contact of the second analyte contact pad and the second analyte contact pad of the test strip. These opposing contact configurations allow the test meter to be advantageously small in size while still providing the electrical connections necessary for the operation of the test meter to the dual chamber multi-analyte test strip. This configuration also provides a connection to the test strip while minimizing the mechanical complexity of the test meter.

In the embodiment of FIGS. 4A and 4B, the signal processing module 204 may be configured to include, for example, a signal receiving component, a signal measuring component, a processor component, and a memory component, each of which is shown in FIGS. 4A and 4B. Not shown). The test meter 200 measures, for example, electrical resistance, electrical continuity or other electrical characteristics between the first working electrode and the first counter / reference electrode layer and between the second working electrode and the second counter / reference electrode layer. can do. Those skilled in the art will appreciate that the test meter 200 may also utilize various sensors and circuits, not shown in FIG. 4A, simplified during measurement of the first analyte and the second analyte.

Successful operation of the dual chamber multi-analyte test strip according to one embodiment of the present invention has been demonstrated as follows. Dual chamber multi-analyte test strips were made from the following materials.

First and Second Insulation and Counter / Reference Insulation Layers-Polyester film having a thickness of about 178 μm (trade name Mellinex 329 from Dupont Teijin Films, Hopewell, Va.) Available for purchase);

First conductive layer and second conductive layer—palladium;

First Relative / Reference Layer and Second Relative / Reference Layer-Gold:

First patterned spacer layer and second patterned spacer layer—total thickness of about 95 μm (consisting of a layer of about 50 um thick PET coated on both major surfaces with a thermoplastic heat-activated adhesive of about 22.5 um thick) ;

First analyte reagent layer (for glucose measurement):

100 mM Tris buffer, pH 7.4;

% w / v hydroxyethyl cellulose;

10% w / v potassium hexacyano iron (III) acid;

1% w / v glucose oxidase;

Second analyte reagent layer (for ketone measurement)

100 mM Tris buffer, pH 7.4;

% w / v hydroxyethyl cellulose;

10% w / v potassium hexacyano iron (III) acid;

1% w / v hydroxybutyrate dehydrogenase;

1% w / v diaphorase.

Dual chamber multi-analyte test strips were prepared using conventional thermal lamination and reagent layer application and drying techniques. The resulting test strips were tested on standard bi-potentiostats. The reference and counter electrodes of the bi-potentiostat were connected to the first counter / reference contact pad and the second counter / reference contact pad of the test strip. The working electrodes of the bi-potentiostat were connected to the first analyte contact pad and the second analyte contact pad of the test strip. These connections were made in a method that is electrically equivalent to that shown in FIG. 4A.

Glucose and ketone standard solutions were applied to the dual chamber multi-analyte test strip. After a 3 second preconditioning sequence (equivalent to an open circuit applied to the test strip for 3 seconds), a 0.4 V potential was applied to the test strip for 7 seconds. 5 shows the current output for a dual chamber multi-analyte test strip for a duration of 0.4 V applied potential. 6 shows that a sufficiently stable current is generated for the control solution sample introduced into both the first sample-receiving chamber and the second sample-receiving chamber of the test strip, which indicates that the test strip is successful in detecting both glucose and ketone. It can be used to indicate that there was no obvious cross contamination in any measurement.

FIG. 6 shows multiple analytes (eg, analyte glucose and ketone analytes 3-, in a single bodily fluid sample (eg, whole blood sample) applied to a dual chamber multi-analyte test strip according to one embodiment of the present invention). Is a flowchart illustrating the steps of the method 300 for measuring hydroxybutyrate).

In step 310 of method 300, a dual chamber multi-analyte test strip is inserted into a test meter. Inserting the test strip into the test meter causes (i) the first electrical connector of the test meter to contact the first analyte contact pad of the first working electrode of the test strip; (ii) the second electrical connector of the test meter is brought into contact with the second analyte contact pad of the second working electrode of the test strip; (iii) the third electrical connector of the test meter is brought into contact with the first counter / reference electrode contact pad of the test strip; (iv) The fourth electrical connector of the test meter is brought into contact with the second counter / reference electrode contact pad of the test strip.

The method also includes measuring at least a first analyte and a second analyte in a single bodily fluid sample applied to the test strip using a signal processing module of the test meter (see step 320 of FIG. 5), wherein The single bodily fluid sample was introduced into the first sample-receiving chamber and the second sample-receiving chamber of the dual chamber multi-analyte test strip after application of the bodily fluid sample to the dual chamber multi-analyte test strip.

During this measuring step, the signal processing module receives the first signal through the first electrical connector and the third electrical connector and uses the first signal for the measurement of the first analyte. During this measuring step, the signal processing module receives the second signal through the second electrical connector and the fourth electrical connector and uses the second signal for the measurement of the second analyte. In method 300, the first counter / reference electrode layer is configured in an opposing relationship with the first working electrode; The second counter / reference electrode layer is configured in an opposing relationship with the second working electrode.

Once the present invention is known, those of ordinary skill in the art will appreciate that the method 300 described herein, as well as any techniques, advantages, and characteristics of a dual chamber multi-analyte test strip according to an embodiment of the present invention described herein. It will be appreciated that it can be readily modified to include any technology, advantages and characteristics of the test meter according to the embodiment of the present invention. Moreover, a bodily fluid sample can be applied to the dual chamber multi-analyte test strip before or after the insertion step.

While preferred embodiments of the invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Various modifications, changes, and substitutions will now occur to those skilled in the art without departing from the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be used to practice the invention. The following claims define the scope of the present invention, which is intended to encompass the devices and methods within the scope of these claims and their equivalents.

Claims (10)

A test meter for use with a dual chamber multi-analyte test strip,
As test strip accommodating module:
A first electrical connector configured to contact a first analyte contact pad of a first working electrode of the dual chamber multi-analyte test strip,
A second electrical connector configured to contact a second analyte contact pad of a second working electrode of the dual chamber multi-analyte test strip,
A third electrical connector configured to contact the first counter / reference contact pad of the first counter / reference electrode layer of the dual chamber multi-analyte test strip, and
The test strip receiving module having a fourth electrical connector configured to contact the second counter / reference contact pad of the second counter / reference electrode layer of the dual chamber multi-analyte test strip; And
A signal processing module,
The signal processing module receives a first signal through the first electrical connector and the third electrical connector, such that the first signal for measurement of a first analyte in a bodily fluid sample applied to the dual chamber multi-analyte test strip. Is configured to utilize;
The signal processing module receives a second signal through the second electrical connector and the fourth electrical connector, such that the second signal is for measurement of a second analyte in a bodily fluid sample applied to the dual chamber multi-analyte test strip. Is also configured to utilize;
A third electrical connector is configured with the dual chamber multi-analyte test strip configured to contact the first mating / reference contact pad in an opposing manner with respect to the contact of the fourth electrical connector and the second mating / reference contact pad. Test meter for use. The dual chamber multi-analyte test of claim 1, wherein the first electrical connector is configured to contact the first analyte contact pad in an opposite manner with respect to the contact of the second electrical connector and the second analyte contact pad. Test meter for use with strips. The test meter of claim 1 wherein the first analyte is not identical compared to the second analyte. The test meter of claim 3 wherein the first analyte is glucose. The test meter of claim 4 wherein the second analyte is a ketone. The test meter of claim 5 wherein the ketone is 3-hydroxybutyrate. The test meter of claim 1 wherein the bodily fluid sample is a whole blood sample. The method of claim 1, wherein the signal processing module is configured to measure the first analyte and to measure the second analyte via an electrochemical-based measurement technique. For testing meter. The test meter of claim 1 wherein the signal processing module is configured to receive the first signal and the second signal sequentially. The test meter of claim 1 wherein the signal processing module is configured to receive the first signal and the second signal simultaneously.
KR1020100103297A 2009-10-27 2010-10-22 Test meter for use with a dual chamber, multi-analyte test strip with opposing electrodes KR20110046307A (en)

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US12/606,496 2009-10-27
KR1020100103297A KR20110046307A (en) 2009-10-27 2010-10-22 Test meter for use with a dual chamber, multi-analyte test strip with opposing electrodes

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