Oxygen enhancing membrane systems for implantable devices
First Claim
1. A system for continuous in vivo measurement of a glucose concentration in a host, the system comprising:
- an implantable sensor configured to generate in vivo a signal indicative of a concentration of glucose in a host;
a membrane located over the sensor, the membrane comprising;
a first domain comprising an enzyme configured to catalyze a reaction that has glucose as a reactant; and
a second domain configured to control a flux therethrough of glucose to the first domain, wherein the second domain comprises a polyurethane-containing material having an oxygen permeability of from about 3 Barters to about 1000 Barters; and
sensor electronics configured to operatively connect with the implantable sensor and to process the signal and determine a glucose concentration value.
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Abstract
The present invention relates generally to systems and methods for increasing oxygen availability to implantable devices. The preferred embodiments provide a membrane system configured to provide protection of the device from the biological environment and/or a catalyst for enabling an enzymatic reaction, wherein the membrane system includes a polymer formed from a high oxygen soluble material. The high oxygen soluble polymer material is disposed adjacent to an oxygen-utilizing source on the implantable device so as to dynamically retain high oxygen availability to the oxygen-utilizing source during oxygen deficits. Membrane systems of the preferred embodiments are useful for implantable devices with oxygen-utilizing sources and/or that function in low oxygen environments, such as enzyme-based electrochemical sensors and cell transplantation devices.
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Citations
36 Claims
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1. A system for continuous in vivo measurement of a glucose concentration in a host, the system comprising:
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an implantable sensor configured to generate in vivo a signal indicative of a concentration of glucose in a host; a membrane located over the sensor, the membrane comprising; a first domain comprising an enzyme configured to catalyze a reaction that has glucose as a reactant; and a second domain configured to control a flux therethrough of glucose to the first domain, wherein the second domain comprises a polyurethane-containing material having an oxygen permeability of from about 3 Barters to about 1000 Barters; and sensor electronics configured to operatively connect with the implantable sensor and to process the signal and determine a glucose concentration value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for continuous in vivo measurement of a glucose concentration in a host, the system comprising:
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an implantable sensor configured to generate in vivo a signal indicative of a concentration of glucose in a host; and a membrane located over the sensor, the membrane comprising; a first domain comprising an enzyme configured to catalyze a reaction that has glucose as a reactant; and a second domain configured to control a flux therethrough of glucose to the first domain, wherein the second domain comprises a polyurea-containing material having an oxygen permeability of from about 3 Barrers to about 1000 Barters; and sensor electronics configured to operatively connect with the implantable sensor and to process the signal and determine a glucose concentration value. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system for continuous in vivo measurement of a glucose concentration in a host, the system comprising:
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an implantable sensor configured to generate in vivo a signal indicative of a concentration of glucose in a host; a membrane located over the sensor, the membrane comprising; a first domain comprising an enzyme configured to catalyze a reaction that has glucose as a reactant; and a second domain configured to control a flux therethrough of glucose to the first domain, wherein the second domain comprises a polyurea-containing material having an oxygen permeability of from about 3 Barrers to about 1000 Barrers; and sensor electronics configured to operatively connect with the implantable sensor and to process the signal and determine a glucose concentration value. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification