Implantable wireless sensor
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United States of America Patent
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Feb 23, 2016
Grant Date -
Jan 29, 2009
app pub date -
Jul 18, 2008
filing date -
Sep 16, 2003
priority date (Note) -
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Abstract
A wireless sensor for indicating a physical state within an environment includes a housing defining a hermetically sealed cavity. A structure located within the cavity of the housing has elements providing capacitance, the elements being arranged such that the distance and thereby the capacitance of the structure changes when a physical state of the environment changes. The structure has a resonant frequency based at least in part on the capacitance of the structure when in the presence of a fluctuating electromagnetic field. When the sensor is positioned within an environment and is subjected to a fluctuating electromagnetic field, the resonant frequency indicates the physical state of the environment.
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