Small volume in vitro analyte sensor
First Claim
1. A sensor for determining concentration of an analyte in a sample fluid, the sensor comprising:
- a first electrode disposed on a first substrate and a second electrode disposed on a second substrate, wherein the first electrode and the second electrode are in a facing configuration;
a spacer comprising a first part and a second part disposed between the first and second substrates, wherein the first part of the spacer, the second part of the spacer, the first substrate, and the second substrate define a first aperture along a first side edge of the sensor and a second aperture along a second side edge of the sensor, wherein either the first aperture or the second aperture is used for sample fluid application and the sensor has no more than two apertures;
a sample chamber for holding the sample fluid and sized to contain a volume of no more than about 1 μ
L of the sample fluid, wherein the sample chamber has a length which extends from the first aperture to the second aperture and a substantially uniform width between the first part of the spacer and the second part of the spacer along the entire length of the sample chamber, and wherein the width of the sample chamber is not wider than either the first aperture or the second aperture; and
an analyte-responsive enzyme and a redox mediator disposed in the sample chamber, wherein;
the first and second substrates define the sensor comprising a proximal end having a width and a distal end having a width, the distal end being configured for insertion into a sensor reader,the width of the distal end is greater than the width of the proximal end, andthe distal end comprises a first extension and a second extension, wherein the first and second extensions are separated by a gap.
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Accused Products
Abstract
A sensor utilizing a non-leachable or diffusible redox mediator is described. The sensor includes a sample chamber to hold a sample in electrolytic contact with a working electrode, and in at least some instances, the sensor also contains a non-leachable or a diffusible second electron transfer agent. The sensor and/or the methods used produce a sensor signal in response to the analyte that can be distinguished from a background signal caused by the mediator. The invention can be used to determine the concentration of a biomolecule, such as glucose or lactate, in a biological fluid, such as blood or serum, using techniques such as coulometry, amperometry, and potentiometry. An enzyme capable of catalyzing the electrooxidation or electroreduction of the biomolecule is typically provided as a second electron transfer agent.
469 Citations
20 Claims
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1. A sensor for determining concentration of an analyte in a sample fluid, the sensor comprising:
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a first electrode disposed on a first substrate and a second electrode disposed on a second substrate, wherein the first electrode and the second electrode are in a facing configuration; a spacer comprising a first part and a second part disposed between the first and second substrates, wherein the first part of the spacer, the second part of the spacer, the first substrate, and the second substrate define a first aperture along a first side edge of the sensor and a second aperture along a second side edge of the sensor, wherein either the first aperture or the second aperture is used for sample fluid application and the sensor has no more than two apertures; a sample chamber for holding the sample fluid and sized to contain a volume of no more than about 1 μ
L of the sample fluid, wherein the sample chamber has a length which extends from the first aperture to the second aperture and a substantially uniform width between the first part of the spacer and the second part of the spacer along the entire length of the sample chamber, and wherein the width of the sample chamber is not wider than either the first aperture or the second aperture; andan analyte-responsive enzyme and a redox mediator disposed in the sample chamber, wherein; the first and second substrates define the sensor comprising a proximal end having a width and a distal end having a width, the distal end being configured for insertion into a sensor reader, the width of the distal end is greater than the width of the proximal end, and the distal end comprises a first extension and a second extension, wherein the first and second extensions are separated by a gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a concentration of an analyte in a sample, comprising:
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contacting the sample with an electrochemical sensor comprising; a working electrode disposed on a first substrate and a second electrode disposed on a second substrate, wherein the working electrode and the second electrode are in a facing configuration; a spacer comprising a first part and a second part disposed between the first and second substrates, wherein the first part of the spacer, the second part of the spacer, the first substrate, and the second substrate define a first aperture along a first side edge of the sensor and a second aperture along a second side edge of the sensor, wherein either the first aperture or the second aperture is used for sample application and the electrochemical sensor has no more than two apertures; a sample chamber for holding the sample and sized to contain a volume of no more than about 1 μ
L of the sample, wherein the sample chamber has a length which extends from the first aperture to the second aperture and a substantially uniform width between the first part of the spacer and the second part of the spacer along the entire length of the sample chamber, and wherein the width of the sample chamber is not wider than either the first aperture or the second aperture; andan analyte-responsive enzyme and a redox mediator disposed in the sample chamber, wherein; the first and second substrates define the electrochemical sensor comprising a proximal end having a width and a distal end having a width, the distal end being configured for insertion into a sensor reader, the width of the distal end is greater than the width of the proximal end, and the distal end comprises a first extension and a second extension, wherein the first and second extensions are separated by a gap; generating a sensor signal at the working electrode; and determining the concentration of the analyte using the sensor signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification