Polymer membranes for continuous analyte sensors
First Claim
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1. A device for continuous in vivo measurement of a glucose concentration, the device comprising:
- an implantable sensor configured to continuously measure a signal indicative of a glucose concentration in a host, wherein the implantable sensor comprises an electroactive surface; and
a membrane located over the implantable sensor, wherein the membrane comprises a first domain comprising an enzyme configured to react with glucose to produce a measured species configured to be oxidized at the implantable sensor, wherein the membrane comprises a second domain comprising a blend comprising;
a polymer comprising a hydrophilic segment, anda polyurethane comprising a plurality of repeating hard segments and repeating soft segments, wherein a soft segment of the plurality of repeating soft segments has a molecular weight from about 200 Daltons to about 50,000 Daltons, wherein a hard segment of the plurality of repeating hard segments has a molecular weight from about 160 Daltons to about 10,000 Daltons, wherein the blend of the polymer and the polyurethane comprises both hydrophilic and hydrophobic regions; and
sensor electronics operably connected to the implantable sensor, wherein the sensor electronics are configured to measure a current flow produced by the sensor to generate sensor data indicative of glucose concentration.
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Abstract
Devices and methods are described for providing continuous measurement of an analyte concentration. In some embodiments, the device has a sensing mechanism and a sensing membrane that includes at least one surface-active group-containing polymer and that is located over the sensing mechanism. The sensing membrane may have a bioprotective layer configured to substantially block the effect and/or influence of non-constant noise-causing species.
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Citations
44 Claims
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1. A device for continuous in vivo measurement of a glucose concentration, the device comprising:
an implantable sensor configured to continuously measure a signal indicative of a glucose concentration in a host, wherein the implantable sensor comprises an electroactive surface; and a membrane located over the implantable sensor, wherein the membrane comprises a first domain comprising an enzyme configured to react with glucose to produce a measured species configured to be oxidized at the implantable sensor, wherein the membrane comprises a second domain comprising a blend comprising; a polymer comprising a hydrophilic segment, and a polyurethane comprising a plurality of repeating hard segments and repeating soft segments, wherein a soft segment of the plurality of repeating soft segments has a molecular weight from about 200 Daltons to about 50,000 Daltons, wherein a hard segment of the plurality of repeating hard segments has a molecular weight from about 160 Daltons to about 10,000 Daltons, wherein the blend of the polymer and the polyurethane comprises both hydrophilic and hydrophobic regions; and sensor electronics operably connected to the implantable sensor, wherein the sensor electronics are configured to measure a current flow produced by the sensor to generate sensor data indicative of glucose concentration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21)
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20. A device for continuous in vivo measurement of a glucose concentration, the device comprising:
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an implantable sensor configured to continuously measure a signal indicative of a glucose concentration in a host, wherein the implantable sensor comprises an electroactive surface; and a membrane located over the implantable sensor, wherein the membrane comprises a first domain comprising an enzyme configured to react with glucose to produce a measured species configured to be oxidized at the sensor, wherein the membrane comprises a second domain comprising a blend comprising; a polymer comprising a hydrophilic segment, wherein the hydrophilic segment comprises acrylate, wherein the polymer comprising the hydrophilic segment comprises from about 5% to about 50% by weight of the blend, and a polyurethane comprising a plurality of repeating hard segments and repeating soft segments, wherein a soft segment of the plurality of repeating soft segments has a molecular weight from about 200 Daltons to about 50,000 Daltons, wherein a hard segment of the plurality of repeating hard segments has a molecular weight from about 160 Daltons to about 10,000 Daltons, wherein the polyurethane comprises silicone, wherein the polyurethane is a polyurethaneurea, wherein the blend of the polymer and the polyurethane comprises both hydrophilic and hydrophobic regions; and sensor electronics operably connected to the sensor, wherein the sensor electronics are configured to measure a current flow produced by the sensor to generate sensor data indicative of glucose concentration; wherein the device is configured to have a sensor session from 5 to 10 days. - View Dependent Claims (22)
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23. A device for in vivo measurement of a glucose concentration, the device comprising:
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an implantable sensor configured to measure a signal indicative of a glucose concentration in a host; a membrane located over the implantable sensor, wherein the membrane comprises a polycarbonate-urethane polymer comprising a plurality of repeating hard segments and repeating soft segments, wherein a soft segment of the plurality of repeating soft segments has a molecular weight from 200 Daltons to 50,000 Daltons, wherein a hard segment of the plurality of repeating hard segments has a molecular weight from 160 Daltons to 10,000 Daltons, wherein the membrane comprises both hydrophilic and hydrophobic regions; and sensor electronics operably connected to the sensor, wherein the sensor electronics are configured to measure a signal produced by the sensor to generate sensor data indicative of glucose concentration. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification