A small diameter flexible electrode designed for subcutaneous in vivo amperometric monitoring of glucose is described. The electrode is designed to allow "one-point" in vivo calibration, i.e., to have zero output current at zero glucose concentration, even in the presence of other electroreactive sp
A small diameter flexible electrode designed for subcutaneous in vivo amperometric monitoring of glucose is described. The electrode is designed to allow "one-point" in vivo calibration, i.e., to have zero output current at zero glucose concentration, even in the presence of other electroreactive species of serum or blood. The electrode is preferably layered, with the layers serially deposited within a recess upon the tip of a polyamide insulated gold wire. A first glucose concentration-to-current transducing layer can be overcoated with an electrically insulating and glucose flux limiting layer (second layer) on which, optionally, an immobilized interference-eliminating horseradish peroxidase based film is deposited. An outer layer is preferably biocompatible.
대표청구항▼
We claim: 1. A glucose or lactate sensor comprising: one or more working electrodes; and an analyte-responsive sensing layer associated with and in electrical contact with the one or more working electrodes, the sensing layer comprising a glucose-specific or lactate-specific enzyme crosslinked with
We claim: 1. A glucose or lactate sensor comprising: one or more working electrodes; and an analyte-responsive sensing layer associated with and in electrical contact with the one or more working electrodes, the sensing layer comprising a glucose-specific or lactate-specific enzyme crosslinked with a polymer selected from the group consisting of poly(vinylimidazole), poly(vinyl pyridine), and poly(acrylamide co-I-vinylimidazole), wherein at least a portion of the sensor is adapted to be subcutaneously positioned in vivo in a subject. 2. The sensor of claim 1, wherein the sensor is a glucose sensor and the glucose-specific enzyme is glucose oxidase. 3. The sensor of claim 2, wherein the sensor has substantially no signal output when the concentration of glucose is zero. 4. The sensor of claim 1, wherein the glucose-specific or lactate-specific enzyme is non-leachable. 5. The sensor of claim 1, wherein the polymer is a redox compound. 6. The sensor of claim 5, wherein the redox compound is non-leachable. 7. The sensor of claim 6, wherein the glucose-specific or lactate-specific enzyme is non-leachable. 8. The sensor of claim 1, further comprising a diffusion-limiting layer. 9. The sensor of claim 8, wherein the diffusion-limiting layer reduces the rate of glucose or lactate or both glucose and lactate transport to the sensing layer. 10. The sensor of claim 8, further comprising one or more additional layers. 11. The sensor of claim 10, wherein the one or more additional layers comprises at least one of a biocompatible layer or an interferant eliminating layer. 12. The sensor of claim 1, wherein the sensor comprises a portion adapted for positioning external to the subject and a portion adapted for positioning in vivo in the subject. 13. The sensor of claim 12, wherein the portion adapted for external positioning is adapted for connection to a device for measurement of the electrical signal generated by the sensor. 14. The sensor of claim 1, wherein the sensor further comprises at least one other electrode, wherein the at least one other electrode is a reference electrode, a counter electrode, or a combined reference and counter electrode. 15. The sensor of claim 1, wherein the one or more working electrodes is a wire. 16. A method of measuring the concentration of glucose or lactate in a subject, the method comprising: contacting body fluid of the subject with the sensor of claim 1 to generate an electrical signal; and determining from the generated electrical signal the concentration of the glucose or lactate in the body fluid. 17. The method of claim 16, wherein the contacting includes positioning at least a portion of the sensor in vivo in the subject. 18. The method of claim 16, wherein the concentration of glucose is measured. 19. The sensor of claim 1, wherein the polymer further comprises [Os (bpy)2 Cl]+/2+; [Os (4,4'-dimethyl bipyridine)2Cl]+/2+; [Os (4,4'-dimethyl phenanthroline)2Cl--]+/2+; [Os (4,4'-dimethyoxy phenanthroline)2Cl]+/2+; or [Os (4,4'-dimethoxy bipyridine)2Cl]+/2+. 20. A glucose or lactate sensor comprising: an electrode comprising a metal wire; and an analyte-responsive sensing layer associated with the wire, the sensing layer comprising a glucose-specific or lactate-specific enzyme crosslinked with a polymer selected from the group consisting of poly(vinylimidazole), poly(vinyl pyridine), and poly(acrylamide co-1-vinylimidazole), wherein at least a portion of the sensor is adapted to be positioned in vivo in a subject. 21. The sensor of claim 20, wherein at least a portion of the sensor is adapted for insertion in vivo in a subject. 22. The sensor of claim 20, wherein the polymer further comprises [Os (bpy)2 Cl]+/2+; [Os (4,4'-dimethyl bipyridine)2Cl]+/2+; [Os (4,4'-dimethyl phenanthroline)2Cl--]+/2+; [Os (4,4'-dimethyoxy phenanthroline)2Cl]+/2+; or [Os (4,4'-dimethoxy bipyridine)2Cl]+/2+. 23. A glucose or lactate sensor comprising: one or more working electrodes; an analyte-responsive sensing layer associated with and in electrical contact with the one or more working electrodes, the sensing layer comprising a glucose-specific or lactate-specific enzyme crosslinked with a polymer selected from the group consisting of poly(vinylimidazole), poly(vinyl pyridine), and poly(acrylamide co-1-vinylimidazole); and at least one additional layer comprising a biocompatible layer, an interferant eliminating layer, or both; wherein at least a portion of the sensor is adapted to be positioned in vivo in a subject. 24. The sensor of claim 23, wherein the at least one additional layer comprises the interferant eliminating layer. 25. The sensor of claim 24, wherein the interferant eliminating layer comprises a peroxidase. 26. The sensor of claim 23, wherein the at least one additional layer comprises the biocompatible layer. 27. The sensor of claim 26, wherein the biocompatible layer comprises poly(ethylene oxide) or poly(ethylene oxide) tetraacrylate. 28. The sensor of claim 23, wherein the at least one additional layer comprises the interferant eliminating layer and the biocompatible layer. 29. The sensor of claim 23, wherein the polymer further comprises [Os (bpy)2 Cl]+/2+; [Os (4,4'-dimethyl bipyridine)2Cl]+/2+; [Os (4,4'-dimethyl phenanthroline)2Cl--]+/2+; [Os (4,4'-dimethyoxy phenanthroline)2Cl]; or [Os (4,4'-dimethoxy bipyridine)2Cl]+/2+. 30. A glucose or lactate sensor comprising: one or more working electrodes; and an analyte-responsive sensing layer associated with and in electrical contact with the one or more working electrodes, the sensing layer comprising a glucose-specific or lactate-specific enzyme crosslinked with an osmium-containing polymer, wherein the osmium-containing polymer comprises poly(vinylimidazole), poly(vinyl pyridine), or poly(acrylamide co-1-vinylimidazole); and wherein at least a portion of the sensor is adapted to be positioned in vivo in a subject. 31. A glucose or lactate sensor comprising: one or more working electrodes; and an analyte-responsive sensing layer associated with and in electrical contact with the one or more working electrodes, the sensing layer comprising a reaction product obtained by a process, the process comprising: (a) contacting a polymer with an osmium compound to produce an osmium-containing polymer; wherein the polymer is poly(vinylimidazole), poly(vinyl pyridine), or poly(acrylamide co-1-vinylimidazole) and the osmium compound is [Os (bpy)2 Cl]+/2+; [Os (4,4'-dimethyl bipyridine)2Cl]+/2+; [Os (4,4'-dimethyl phenanthroline)2Cl--]/+/2+; [Os (4,4'-dimethyoxy phenanthroline)2Cl]+/2+; or [Os (4,4'-dimethoxy bipyridine)2Cl ]+/2+; and (b) crosslinking the osmium-containing polymer with glucose oxidase or lactate oxidase to produce the reaction product; wherein at least a portion of the sensor is adapted to be positioned in vivo in a subject.
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