作者: Yoram Palti
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摘要: Data is communicated from an implanted section to external location. The includes a transducer such as piezoelectric element with ultrasound reflecting surface that moves in response applied driving signal. A sensor generates output signal depends on sensed parameter, and control circuit drives the based sensor's output. transducer's repeatable value of can be determined by measuring variations velocity using externally Doppler ultrasound, computing measured velocity.