Dry insertion and one-point in vivo calibration of an optical analyte sensor
First Claim
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1. A method for monitoring glucose concentration in a physiological fluid in a patient, comprising:
- providing a sensor comprising an equilibrium fluorescence chemical indicator system immobilized in a hydrogel disposed along a distal region of an optical fiber, wherein the hydrogel comprising the immobilized chemical indicator system is in a dry state;
deploying the distal region of the optical fiber in the physiological fluid, wherein the hydrogel with immobilized chemical indicator system disposed along the distal region of the optical fiber is deployed in a dry state;
allowing the hydrogel with immobilized chemical indicator system to hydrate in vivo in the physiological fluid;
after in vivo hydration, performing an in vivo calibration of the fluorescent response of the immobilized chemical indicator system against an independently measured glucose concentration in the physiological fluid; and
monitoring the glucose concentration in the physiological fluid after calibration.
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Abstract
Disclosed are embodiments that relate to the deployment of a glucose sensor comprising an optical fiber into a physiological fluid, wherein the optical fiber has disposed along a distal region thereof a chemical indicator system comprising a fluorophore and a glucose binding moiety immobilized within a hydrogel, wherein the components of the chemical indicator system are in a dry state before deployment. Also disclosed is a one-point in vivo calibration of the chemical indicator system based on an independently measured glucose concentration.
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Citations
16 Claims
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1. A method for monitoring glucose concentration in a physiological fluid in a patient, comprising:
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providing a sensor comprising an equilibrium fluorescence chemical indicator system immobilized in a hydrogel disposed along a distal region of an optical fiber, wherein the hydrogel comprising the immobilized chemical indicator system is in a dry state; deploying the distal region of the optical fiber in the physiological fluid, wherein the hydrogel with immobilized chemical indicator system disposed along the distal region of the optical fiber is deployed in a dry state; allowing the hydrogel with immobilized chemical indicator system to hydrate in vivo in the physiological fluid; after in vivo hydration, performing an in vivo calibration of the fluorescent response of the immobilized chemical indicator system against an independently measured glucose concentration in the physiological fluid; and monitoring the glucose concentration in the physiological fluid after calibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for monitoring glucose concentration in a physiological fluid in a patient, comprising:
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providing a sensor comprising an equilibrium fluorescence chemical indicator system immobilized in a hydrogel disposed along a distal region of an optical fiber, wherein the hydrogel comprising the immobilized chemical indicator system is in a dry state; deploying the distal region of the optical fiber in the physiological fluid without performing ex vivo calibration, wherein the hydrogel with immobilized chemical indicator system disposed along the distal region of the optical fiber is deployed in a dry state; allowing the hydrogel with immobilized chemical indicator system to hydrate in vivo in the physiological fluid for at least 10 minutes; after in vivo hydration, performing a one-point in vivo calibration of the fluorescent response of the immobilized chemical indicator system against an independently measured glucose concentration in the physiological fluid; and monitoring the glucose concentration in the physiological fluid after calibration. - View Dependent Claims (14, 15, 16)
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Specification