| 摘要 |
<p>PURPOSE: An implantable and insertable passive tag is provided to achieve improved wireless tags fixed to devices that are inserted into or implanted in the body of a patient for use in determining coordinates of the device inside the body. CONSTITUTION: An apparatus for determining the position of an object within a body of a subject comprises at least one acoustic wave generator(11,13,15), adapted to direct a first acoustic wave toward the body at a first frequency, an acoustic tag(12) adapted to be fixed to the object, the tag comprising a shell defining a cavity therein and a medium contained within the shell, such that responsive to incidence thereon of the first acoustic wave, the tag emits a second acoustic wave at a second frequency, different from the first frequency, one or more detectors(17), adapted to detect the second acoustic wave and to generate signals responsive thereto, and a signal processor(30), coupled to process the signals so as to determine coordinates of the object in the body.</p> |
