Membrane based electrochemical test device and related methods
First Claim
1. An electrochemical test device for determining the presence or concentration of an analyte in an aqueous fluid sample, said electrochemical test device comprising:
- (a) a non-conductive membrane having a first skin and a second skin and a matrix therebetween;
(b) a working electrode comprising an amorphous semiconductor material affixed to the non-conductive membrane first skin, said working electrode having an first electrode area, a first lead and a first contact pad;
(c) an opposing electrode comprising an amorphous semiconductor material affixed to the non-conductive membrane second skin, said opposing electrode having an second electrode area, a second lead and a second contact pad; and
(d) a reagent capable of reacting with the analyte to produce a measurable change in potential which can be correlated to the concentration of the analyte in the fluid sample, said reagent imbibed in the membrane matrix between the working electrode and opposing electrode.
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Abstract
An electrochemical test device is provided for determining the presence or concentration of an analyte in an aqueous fluid sample. The electrochemical test device includes a working electrode and a counter electrode made of an amorphous semiconductor material. The working electrode is overlaid with a reagent capable of reacting with an analyte to produce a measurable change in potential which can be correlated to the concentration of the analyte in the fluid sample. The test device optionally contains a reference electrode made of an amorphous semiconductor material having a reference material on the reference electrode.
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Citations
15 Claims
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1. An electrochemical test device for determining the presence or concentration of an analyte in an aqueous fluid sample, said electrochemical test device comprising:
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(a) a non-conductive membrane having a first skin and a second skin and a matrix therebetween;
(b) a working electrode comprising an amorphous semiconductor material affixed to the non-conductive membrane first skin, said working electrode having an first electrode area, a first lead and a first contact pad;
(c) an opposing electrode comprising an amorphous semiconductor material affixed to the non-conductive membrane second skin, said opposing electrode having an second electrode area, a second lead and a second contact pad; and
(d) a reagent capable of reacting with the analyte to produce a measurable change in potential which can be correlated to the concentration of the analyte in the fluid sample, said reagent imbibed in the membrane matrix between the working electrode and opposing electrode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining the presence or concentration of an analyte in an aqueous fluid sample, said method comprising:
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(a) providing an electrochemical test device comprising;
(i) a non-conductive double skinned membrane;
(ii) a working electrode comprising an amorphous semiconductor material affixed to the non-conductive membranes first skin surface, said working electrode having an first electrode area, a first lead and a first contact pad;
(iii) a counter electrode comprising an amorphous semiconductor material affixed to the non-conductive membranes second skin surface, said counter electrode having a second electrode area, a second lead, and a second contact pad; and
(iv) a reagent capable of reacting with the analyte to produce a measurable change in potential which can be correlated to the presence or concentration of the analyte in the fluid sample, said reagent imbibed into the membrane between the working and opposing;
(b) inserting the electrochemical test device into a meter device;
(c) applying a sample of an aqueous fluid to the first electrode area of the working electrode;
(d) reading the meter device to determine the presence or concentration of the analyte in the fluid sample. - View Dependent Claims (8, 9, 10)
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11. A process for preparing an electrochemical test device suitable for determining the presence or concentration of an analyte in an aqueous fluid sample, said process comprising the steps of:
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(a) providing a non-conductive double skinned membrane;
(b) depositing an amorphous semiconductor material on said first skin surface to form a conductive layer which forms a working electrode comprising a first electrode having a first electrode area, a first lead and a first contact pad (c) depositing an amorphous semiconductor material on said second skin surface to form a conductive layer, which forms an opposing electrode comprising a second electrode having a second electrode area, a second lead and a second contact pad (d) applying a reagent to imbibe the membrane through the fast electrode area of the working electrode, said reagent being capable of reacting with an analyte in an aqueous fluid sample to produce a measurable change in potential which can be correlated to the concentration of the analyte in the fluid sample. - View Dependent Claims (12, 13, 14, 15)
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Specification