Surgical implement detector utilizing a resonant marker
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United States of America Patent
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Oct 15, 1991
Grant Date -
N/A
app pub date -
Nov 16, 1989
filing date -
Nov 16, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for detecting a surgical implement in human or animal tissue comprises a detector responsive to the presence, within an interrogation zone, of a surgical implement to which a marker is secured. The marker is adapted to produce identifying signal characteristics within a frequency band generated in the interrogation zone. Variations in the phase and or direction of the interrogating field and changes in the electromagnetic coupling between markers and receiver optimize coupling therebetween.
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