Method of applying insulation for coating implantable components and other microminiature devices
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United States of America Patent
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Oct 29, 2002
Grant Date -
N/A
app pub date -
Sep 9, 1999
filing date -
Dec 20, 1996
priority date (Note) -
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Abstract
A protective, biocompatible coating or encapsulation material protects and insulates a component or device intended to be implanted in living tissue. The coating or encapsulation material comprises a thin layer or layers of alumina, zerconia, or other ceramic, less than 25 microns thick, e.g., 5-10 microns thick. The alumina layer(s) may be applied at relatively low temperature. Once applied, the layer provides excellent hermeticity, and prevents electrical leakage. Even though very thin, the alumina layer retains excellent insulating characteristics. In one embodiment, an alumina layer less than about 6 microns thick provides an insulative coating that exhibits less than 10 pA of leakage current over an area 75 mils by 25 mils area while soaking in a saline solution at temperatures up to 80.degree. C. over a three month period.
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