Bilirubin sensor
First Claim
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1. A bilirubin sensor comprising:
- a working electrode with a first chemical matrix disposed thereon, the first chemical matrix containing a binder, wherein the first chemical matrix is capable of oxidizing all oxidizable species in a fluid sample;
a substrate electrode with a second chemical matrix disposed thereon, the second chemical matrix containing a binder and a chemical agent that consumes bilirubin, wherein the second chemical matrix is capable of oxidizing all oxidizable species in the fluid sample except bilirubin;
a reference electrode;
a sample chamber containing the working electrode, the substrate electrode and the reference electrode;
means for applying a potential between the reference electrode and the working electrode to obtain a first current;
means for applying a potential between the reference electrode and the substrate electrode to obtain a second current;
means for correlating the first current to a concentration of all oxidizable species in the fluid sample and for correlating the second current to a concentration of all oxidizable species in the fluid sample except bilirubin;
means for subtracting the second current from the first current to obtain a current difference;
and means for correlating the current difference to a concentration of bilirubin in the fluid sample.
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Abstract
A bilirubin sensor has a working electrode with a first chemical matrix disposed thereon that contains a binder, a substrate electrode with a second chemical matrix dispose thereon that contains a binder and a chemical agent that consumes bilirubin, a reference electrode, a sample chamber containing the working electrode, the substrate electrode and the reference electrode, and a method of measuring bilirubin in a body fluid.
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Citations
25 Claims
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1. A bilirubin sensor comprising:
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a working electrode with a first chemical matrix disposed thereon, the first chemical matrix containing a binder, wherein the first chemical matrix is capable of oxidizing all oxidizable species in a fluid sample; a substrate electrode with a second chemical matrix disposed thereon, the second chemical matrix containing a binder and a chemical agent that consumes bilirubin, wherein the second chemical matrix is capable of oxidizing all oxidizable species in the fluid sample except bilirubin; a reference electrode; a sample chamber containing the working electrode, the substrate electrode and the reference electrode; means for applying a potential between the reference electrode and the working electrode to obtain a first current; means for applying a potential between the reference electrode and the substrate electrode to obtain a second current; means for correlating the first current to a concentration of all oxidizable species in the fluid sample and for correlating the second current to a concentration of all oxidizable species in the fluid sample except bilirubin; means for subtracting the second current from the first current to obtain a current difference; and means for correlating the current difference to a concentration of bilirubin in the fluid sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A bilirubin sensor comprising:
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a working electrode with a first chemical matrix disposed thereon, the first chemical matrix containing a whole blood filtering component, wherein the first chemical matrix is capable of oxidizing all oxidizable species in a fluid sample; a substrate electrode with a second chemical matrix disposed thereon, the second chemical matrix containing a whole blood filtering component and a chemical agent that consumes bilirubin, wherein the second chemical matrix is capable of oxidizing all oxidizable species in the fluid sample except bilirubin; a reference electrode; a sample chamber containing the working electrode, the substrate electrode and the reference electrode; means for applying a potential between the reference electrode and the working electrode to obtain a first current; means for applying a potential between the reference electrode and the substrate electrode to obtain a second current; means for correlating the first current to a concentration of all oxidizable species in the fluid sample and for correlating the second current to a concentration of all oxidizable species in the fluid sample except bilirubin; means for subtracting the second current from the first current to obtain a current difference; and means for correlating the current difference to a concentration of bilirubin in the fluid sample. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of measuring bilirubin in a fluid sample comprising the steps of:
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disposing the fluid sample into a sample chamber of a bilirubin sensor; applying a potential between a reference electrode and a working electrode in the sample chamber, wherein the working electrode has a first chemical matrix disposed thereon that contains a binder and that serves to oxidize all oxidizable species in the fluid sample; measuring a first current generated between the working electrode and the reference electrode, wherein the first current is correlated to a concentration of all oxidizable species in the fluid sample; applying a potential between the reference electrode and a substrate electrode in the sample chamber, wherein the substrate electrode has a second chemical matrix disposed thereon that contains a binder and a chemical agent that consumes bilirubin so as to oxidize all oxidizable species in the fluid sample except bilirubin; measuring a second current generated between the reference electrode and the substrate electrode, wherein the second current is correlated to a concentration of all oxidizable species in the fluid sample except bilirubin; subtracting the second current from the first current and obtaining a current difference; and correlating the current difference to a concentration of bilirubin in the fluid sample. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification