| 摘要 |
An improved antenna for use with an implantable microdevice (12), such as a microstimulator or microsensor, comprises a loop antenna (13) on the case of the microdevice. The antenna receives data transmitted from an external device (14), and transmits data to an external device. Such a loop antenna may be formed from two cylindrical sections (20A, 20B) separated by an insulating material on the case of the microdevice, or separating a metal cylinder into two parallel semi-cylinders (28A, 28B) separated by an insulating material. A tuning circuit (26A) 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 (32,34) 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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