Oxygen enhancing membrane systems for implantable devices
First Claim
1. An electrochemical sensor for determining a presence or a concentration of an analyte in a fluid, the sensor comprising:
- a membrane comprising an enzyme domain comprising an enzyme that reacts with the analyte in the fluid as it passes through the enzyme domain; and
an electroactive surface configured to measure a product of a reaction of the enzyme with the analyte, wherein the enzyme domain comprises an oxygen soluble polymer material and wherein the enzyme domain is permeable to the analyte.
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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.
296 Citations
37 Claims
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1. An electrochemical sensor for determining a presence or a concentration of an analyte in a fluid, the sensor comprising:
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a membrane comprising an enzyme domain comprising an enzyme that reacts with the analyte in the fluid as it passes through the enzyme domain; and
an electroactive surface configured to measure a product of a reaction of the enzyme with the analyte, wherein the enzyme domain comprises an oxygen soluble polymer material and wherein the enzyme domain is permeable to the analyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An electrochemical sensor for determining a presence or a concentration of an analyte in a fluid, the sensor comprising:
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a membrane comprising;
an enzyme domain comprising an enzyme that reacts with the analyte in the fluid as it passes through the enzyme domain; and
a cell impermeable domain that is substantially impermeable to cells, wherein the cell impermeable domain is situated more distal to a working electrode than the enzyme domain; and
a working electrode, wherein the working electrode is configured to measure a product of a reaction of the enzyme with the analyte;
wherein the cell impermeable domain comprises an oxygen soluble polymer and wherein the cell impermeable domain is partially permeable to the analyte. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification