Techniques for minimizing radiofrequency-induced tissue heating

摘要

Methods and systems are provided for wirelessly powering a medical device (16) in a living subject (14) using external radiofrequency energy. A radiofrequency driving unit (12) outside the subject (14) irradiates the medical device. A passive antenna (28) is positioned outside the subject (14), generally opposing the driving unit (12) to redirect the field generally toward the device (16). The reradiating element (28) increases uniformity of the electromagnetic field produced by the driving unit (12), which reduces local tissue heating in the subject and in personnel attending the subject.