| 摘要 |
<p>PCT No. PCT/GB90/01977 Sec. 371 Date Aug. 11, 1992 Sec. 102(e) Date Aug. 11, 1992 PCT Filed Dec. 18, 1990 PCT Pub. No. WO91/08706 PCT Pub. Date Jun. 27, 1991.An ultrasonic invasive instrument such as a biopsy needle has an ultrasonic transducer mounted at one end, with the transducer being electrically coupled to two conductors such as a stylet and central cannula forming the instrument body and transmitting signals from the transducer identifying the instrument's location in a field transmitted by an imaging scanner, the transducer being coupled to at least one of the conductors by an ohmic or capacitive coupling, with for example body fluids serving as the couplant material.</p> |
