In-situ chemistry stack for continuous glucose sensors
First Claim
1. An analyte sensor apparatus comprising:
- a crosslinked polymer matrix disposed on a working electrode, wherein the crosslinked polymer matrix is formed in-situ on an electroactive surface of the working electrode by exposing a polymerization reaction mixture to ultraviolet (UV) light, wherein;
(a) the polymerization reaction mixture comprises;
a plurality of hydroxyethyl methacrylate (HEMA) monomers;
one or more di-acrylate crosslinkers;
one or more UV photoinitiators; and
glucose oxidase; and
(b) the polymerization reaction mixture is exposed to the (UV) light so that the glucose oxidase is covalently linked to the crosslinked polymer matrix,the analyte sensor apparatus further comprising;
a glucose limiting membrane disposed over the crosslinked polymer matrix, wherein the glucose limiting membrane is formed in-situ over the crosslinked polymer matrix by exposing a membrane reaction mixture to ultraviolet (UV) light, wherein;
the membrane reaction mixture comprises;
a plurality of hydroxyethyl methacrylate (HEMA) monomers;
one or more di-acrylate crosslinkers;
one or more UV photoinitiators;
ethylene glycol; and
water.
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Abstract
Embodiments of the invention provide an in-situ polymerization technique for creating a glucose sensor chemistry stack. An analyte sensor comprises a crosslinked polymer matrix in contact with an electrode. The crosslinked polymer matrix is formed by exposing ultraviolet (UV) light to a polymer matrix mixture comprising a plurality of hydroxyethyl methacrylate (HEMA) monomers, one or more di-acrylate crosslinkers, one or more UV photoinitiators, and an oxidoreductase. The oxidoreductase is covalently linked to the crosslinked polymer matrix. In typical embodiments, the oxidoreductase is a glucose oxidase-acrylate bioconjugate. In one or more embodiments, the analyte sensor apparatus further comprises a glucose limiting membrane positioned over the crosslinked polymer matrix. The glucose limiting membrane is formed by exposing ultraviolet (UV) light to a glucose limiting membrane mixture comprising a plurality of hydroxyethyl methacrylate (HEMA) monomers, one or more di-acrylate crosslinkers, one or more UV photoinitiators, ethylene glycol, and water.
85 Citations
18 Claims
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1. An analyte sensor apparatus comprising:
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a crosslinked polymer matrix disposed on a working electrode, wherein the crosslinked polymer matrix is formed in-situ on an electroactive surface of the working electrode by exposing a polymerization reaction mixture to ultraviolet (UV) light, wherein; (a) the polymerization reaction mixture comprises; a plurality of hydroxyethyl methacrylate (HEMA) monomers; one or more di-acrylate crosslinkers; one or more UV photoinitiators; and glucose oxidase; and (b) the polymerization reaction mixture is exposed to the (UV) light so that the glucose oxidase is covalently linked to the crosslinked polymer matrix, the analyte sensor apparatus further comprising; a glucose limiting membrane disposed over the crosslinked polymer matrix, wherein the glucose limiting membrane is formed in-situ over the crosslinked polymer matrix by exposing a membrane reaction mixture to ultraviolet (UV) light, wherein; the membrane reaction mixture comprises; a plurality of hydroxyethyl methacrylate (HEMA) monomers; one or more di-acrylate crosslinkers; one or more UV photoinitiators; ethylene glycol; and water. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of forming a working electrode in an analyte sensor apparatus, the method comprising:
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(a) forming a monomer mixture on an electroactive surface of the electrode, the monomer mixture comprising; a plurality of hydroxyethyl methacrylate (HEMA) monomers; one or more di-acrylate crosslinkers; one or more UV photoinitiators; and glucose oxidase; (b) polymerizing the monomer mixture with ultraviolet (UV) light so as to form a crosslinked polymer matrix on the electrode, wherein the glucose oxidase is covalently linked to the crosslinked polymer matrix; (c) forming a glucose limiting membrane mixture over the crosslinked polymer matrix, the membrane mixture comprising; a plurality of hydroxyethyl methacrylate (HEMA) monomers; one or more di-acrylate crosslinkers; one or more UV photoinitiators; ethylene glycol; and water; and (d) polymerizing the glucose limiting membrane mixture with ultraviolet (UV) light to form a glucose limiting membrane. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification