| 摘要 |
A medical device comprises a cannula for insertion to a target location in a body and at least one resonator situated on a surface of the cannula. The resonator resonates in response to an ultrasonic frequency applied to the target location to indicate the location of the cannula in the body. The ultrasonic frequency is generated by a transducer located external to the body. The medical device also comprises a device converting resonated frequencies into an image.
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