Antenna for miniature implanted medical device
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United States of America Patent
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-
Oct 12, 2004
Grant Date -
Apr 11, 2002
app pub date -
Sep 28, 2001
filing date -
Oct 11, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved antenna for use with an implantable microdevice, such as a microstimulator or microsensor, comprises a loop antenna on the case of the microdevice. The antenna receives data transmitted from an external device, and transmits data to an external device. Such a loop antenna may be formed from two cylindrical sections separated by an insulating material on the case of the microdevice, or by separating a metal cylinder into two parallel semi-cylinders separated by an insulating material. A tuning circuit comprising capacitors and/or varactors is used to obtain resonance in the loop antenna, thus creating a sufficiently large effective antenna aperture. In a preferred embodiment, the electrodes of the microdevice are modified to both perform their primary task of tissue stimulation and to perform a secondary task as the radiating elements of a loop antenna.
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