Spiral shield for a flexible high-Q implantable inductively coupled device
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United States of America Patent
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Apr 1, 2003
Grant Date -
N/A
app pub date -
Jan 19, 2001
filing date -
Jan 19, 2001
priority date (Note) -
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Abstract
A spiral shield for an implantable secondary coil confines the electrical field of the coil, and thus prevents capacitive coupling of the coil through surrounding dielectrics (such as human tissue.) Known implantable devices receive power inductively, through a secondary coil, from a primary coil in an external device. Efficient power reception requires that the coils be tuned to the same resonant frequency. Use of the spiral shield results in predictable electrical behavior of the secondary coil and permits the secondary coil to be accurately tuned to the same resonate frequency as the primary coil. To further improve performance, spacers made from SILBIONE.RTM.LSR 70 reside between turns of the coil to reduce turn to turn and turn to shield capacitances. Reducing the capacitances prevents excessive reduction of the self resonant frequency of the coil. The coil is imbedded in SILBIONE.RTM.LSR 70, allowing for a thin and flexible coil.
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